[svn-r8683] Purpose:

    Code optimization

Description:
    Use 'size_t' instead of 'hsize_t' to track the number of elements in
memory buffers, especially for type conversion.

Platforms tested:
    Solaris 2.7 (arabica)
    FreeBSD 4.10 (sleipnir) w/parallel
    Too minor to require h5committest

17 files changed, 545 insertions, 578 deletions

diff --git a/src/H5A.c b/src/H5A.c
index 37d650b..5f5b7195 100644
--- a/src/H5A.c
+++ b/src/H5A.c
@@ -613,7 +613,7 @@ H5A_write(H5A_t *attr, const H5T_t *mem_type, const void *buf, hid_t dxpl_id)
     uint8_t		*tconv_buf = NULL;	/* data type conv buffer */
     uint8_t		*bkg_buf = NULL;	/* temp conversion buffer */
     hssize_t		snelmts;		/* elements in attribute */
-    hsize_t		nelmts;		    	/* elements in attribute */
+    size_t		nelmts;		    	/* elements in attribute */
     H5T_path_t		*tpath = NULL;		/* conversion information*/
     hid_t		src_id = -1, dst_id = -1;/* temporary type atoms */
     size_t		src_type_size;		/* size of source type	*/
@@ -631,7 +631,7 @@ H5A_write(H5A_t *attr, const H5T_t *mem_type, const void *buf, hid_t dxpl_id)
     /* Create buffer for data to store on disk */
     if((snelmts=H5S_GET_EXTENT_NPOINTS(attr->ds))<0)
         HGOTO_ERROR (H5E_ATTR, H5E_CANTCOUNT, FAIL, "dataspace is invalid")
-    nelmts=(hsize_t)snelmts;
+    H5_ASSIGN_OVERFLOW(nelmts,snelmts,hssize_t,size_t);
 
     /* Check for null dataspace */
     if(nelmts>0) {
@@ -640,13 +640,12 @@ H5A_write(H5A_t *attr, const H5T_t *mem_type, const void *buf, hid_t dxpl_id)
         dst_type_size = H5T_get_size(attr->dt);
 
         /* Get the maximum buffer size needed and allocate it */
-        H5_ASSIGN_OVERFLOW(buf_size,nelmts*MAX(src_type_size,dst_type_size),hsize_t,size_t);
+        buf_size=nelmts*MAX(src_type_size,dst_type_size);
         if (NULL==(tconv_buf = H5MM_malloc (buf_size)) || NULL==(bkg_buf = H5MM_calloc(buf_size)))
             HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
 
         /* Copy the user's data into the buffer for conversion */
-        H5_CHECK_OVERFLOW((src_type_size*nelmts),hsize_t,size_t);
-        HDmemcpy(tconv_buf,buf,(size_t)(src_type_size*nelmts));
+        HDmemcpy(tconv_buf,buf,(src_type_size*nelmts));
 
         /* Convert memory buffer into disk buffer */
         /* Set up type conversion function */
@@ -763,7 +762,7 @@ H5A_read(const H5A_t *attr, const H5T_t *mem_type, void *buf, hid_t dxpl_id)
     uint8_t		*tconv_buf = NULL;	/* data type conv buffer*/
     uint8_t		*bkg_buf = NULL;	/* background buffer */
     hssize_t		snelmts;		/* elements in attribute */
-    hsize_t		nelmts;			/* elements in attribute*/
+    size_t		nelmts;			/* elements in attribute*/
     H5T_path_t		*tpath = NULL;		/* type conversion info	*/
     hid_t		src_id = -1, dst_id = -1;/* temporary type atoms*/
     size_t		src_type_size;		/* size of source type 	*/
@@ -780,7 +779,7 @@ H5A_read(const H5A_t *attr, const H5T_t *mem_type, void *buf, hid_t dxpl_id)
     /* Create buffer for data to store on disk */
     if((snelmts=H5S_GET_EXTENT_NPOINTS(attr->ds))<0)
         HGOTO_ERROR (H5E_ATTR, H5E_CANTCOUNT, FAIL, "dataspace is invalid")
-    nelmts=(hsize_t)snelmts;
+    H5_ASSIGN_OVERFLOW(nelmts,snelmts,hssize_t,size_t);
 
     /* Check for null dataspace */
     if(nelmts>0) {
@@ -789,19 +788,17 @@ H5A_read(const H5A_t *attr, const H5T_t *mem_type, void *buf, hid_t dxpl_id)
         dst_type_size = H5T_get_size(mem_type);
 
         /* Check if the attribute has any data yet, if not, fill with zeroes */
-        H5_CHECK_OVERFLOW((dst_type_size*nelmts),hsize_t,size_t);
         if(attr->ent_opened && !attr->initialized) {
-            HDmemset(buf,0,(size_t)(dst_type_size*nelmts));
+            HDmemset(buf,0,(dst_type_size*nelmts));
         }   /* end if */
         else {  /* Attribute exists and has a value */
             /* Get the maximum buffer size needed and allocate it */
-            H5_ASSIGN_OVERFLOW(buf_size,(nelmts*MAX(src_type_size,dst_type_size)),hsize_t,size_t);
+            buf_size=nelmts*MAX(src_type_size,dst_type_size);
             if (NULL==(tconv_buf = H5MM_malloc (buf_size)) || NULL==(bkg_buf = H5MM_calloc(buf_size)))
                 HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
 
             /* Copy the attribute data into the buffer for conversion */
-            H5_CHECK_OVERFLOW((src_type_size*nelmts),hsize_t,size_t);
-            HDmemcpy(tconv_buf,attr->data,(size_t)(src_type_size*nelmts));
+            HDmemcpy(tconv_buf,attr->data,(src_type_size*nelmts));
 
             /* Convert memory buffer into disk buffer */
             /* Set up type conversion function */
@@ -818,7 +815,7 @@ H5A_read(const H5A_t *attr, const H5T_t *mem_type, void *buf, hid_t dxpl_id)
                 HGOTO_ERROR(H5E_ATTR, H5E_CANTENCODE, FAIL, "data type conversion failed")
 
             /* Copy the converted data into the user's buffer */
-            HDmemcpy(buf,tconv_buf,(size_t)(dst_type_size*nelmts));
+            HDmemcpy(buf,tconv_buf,(dst_type_size*nelmts));
         } /* end else */
     } /* end if */
 
diff --git a/src/H5Dio.c b/src/H5Dio.c
index a7686ed..389cfef 100644
--- a/src/H5Dio.c
+++ b/src/H5Dio.c
@@ -256,7 +256,7 @@ H5D_fill(const void *fill, const H5T_t *fill_type, void *buf, const H5T_t *buf_t
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTREGISTER, FAIL, "unable to register types for conversion")
 
             /* Perform data type conversion */
-            if (H5T_convert(tpath, src_id, dst_id, (hsize_t)1, 0, 0, tconv_buf, bkg_buf, dxpl_id)<0)
+            if (H5T_convert(tpath, src_id, dst_id, 1, 0, 0, tconv_buf, bkg_buf, dxpl_id)<0)
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, FAIL, "data type conversion failed")
         } /* end if */
     } /* end if */
@@ -1057,7 +1057,7 @@ H5D_contig_read(hsize_t nelmts, H5D_t *dataset,
     size_t	dst_type_size;	        /*size of destination type*/
     size_t	max_type_size;	        /* Size of largest source/destination type */
     size_t	target_size;		/*desired buffer size	*/
-    hsize_t	request_nelmts;		/*requested strip mine	*/
+    size_t	request_nelmts;		/*requested strip mine	*/
     H5S_sel_iter_t mem_iter;            /*memory selection iteration info*/
     hbool_t	mem_iter_init=0;	/*memory selection iteration info has been initialized */
     H5S_sel_iter_t bkg_iter;            /*background iteration info*/
@@ -1068,7 +1068,7 @@ H5D_contig_read(hsize_t nelmts, H5D_t *dataset,
     uint8_t	*tconv_buf = NULL;	/*data type conv buffer	*/
     uint8_t	*bkg_buf = NULL;	/*background buffer	*/
     hsize_t	smine_start;		/*strip mine start loc	*/
-    hsize_t	n, smine_nelmts;	/*elements per strip	*/
+    size_t	n, smine_nelmts;	/*elements per strip	*/
     herr_t	ret_value = SUCCEED;	/*return value		*/
 
     FUNC_ENTER_NOAPI_NOINIT(H5D_contig_read)
@@ -1171,8 +1171,7 @@ H5D_contig_read(hsize_t nelmts, H5D_t *dataset,
     } /* end if */
     if (need_bkg && NULL==(bkg_buf=dxpl_cache->bkgr_buf)) {
         /* Allocate background buffer */
-        H5_CHECK_OVERFLOW((request_nelmts*dst_type_size),hsize_t,size_t);
-        if((bkg_buf=H5FL_BLK_CALLOC(type_conv,(size_t)(request_nelmts*dst_type_size)))==NULL)
+        if((bkg_buf=H5FL_BLK_CALLOC(type_conv,(request_nelmts*dst_type_size)))==NULL)
             HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for background conversion")
     } /* end if */
 
@@ -1309,7 +1308,7 @@ H5D_contig_write(hsize_t nelmts, H5D_t *dataset,
     size_t	dst_type_size;	        /*size of destination type*/
     size_t	max_type_size;	        /* Size of largest source/destination type */
     size_t	target_size;		/*desired buffer size	*/
-    hsize_t	request_nelmts;		/*requested strip mine	*/
+    size_t	request_nelmts;		/*requested strip mine	*/
     H5S_sel_iter_t mem_iter;            /*memory selection iteration info*/
     hbool_t	mem_iter_init=0;	/*memory selection iteration info has been initialized */
     H5S_sel_iter_t bkg_iter;            /*background iteration info*/
@@ -1320,7 +1319,7 @@ H5D_contig_write(hsize_t nelmts, H5D_t *dataset,
     uint8_t	*tconv_buf = NULL;	/*data type conv buffer	*/
     uint8_t	*bkg_buf = NULL;	/*background buffer	*/
     hsize_t	smine_start;		/*strip mine start loc	*/
-    hsize_t	n, smine_nelmts;	/*elements per strip	*/
+    size_t	n, smine_nelmts;	/*elements per strip	*/
     herr_t	ret_value = SUCCEED;	/*return value		*/
 
     FUNC_ENTER_NOAPI_NOINIT(H5D_contig_write)
@@ -1421,8 +1420,7 @@ H5D_contig_write(hsize_t nelmts, H5D_t *dataset,
     } /* end if */
     if (need_bkg && NULL==(bkg_buf=dxpl_cache->bkgr_buf)) {
         /* Allocate background buffer */
-        H5_CHECK_OVERFLOW((request_nelmts*dst_type_size),hsize_t,size_t);
-        if((bkg_buf=H5FL_BLK_CALLOC(type_conv,(size_t)(request_nelmts*dst_type_size)))==NULL)
+        if((bkg_buf=H5FL_BLK_CALLOC(type_conv,(request_nelmts*dst_type_size)))==NULL)
             HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for background conversion")
     } /* end if */
 
@@ -1557,9 +1555,9 @@ H5D_chunk_read(hsize_t nelmts, H5D_t *dataset,
     size_t	dst_type_size;	        /*size of destination type*/
     size_t	max_type_size;	        /* Size of largest source/destination type */
     size_t	target_size;		/*desired buffer size	*/
-    hsize_t	request_nelmts;		/*requested strip mine	*/
+    size_t	request_nelmts;		/*requested strip mine	*/
     hsize_t     smine_start;            /*strip mine start loc  */
-    hsize_t     n, smine_nelmts;        /*elements per strip    */    
+    size_t      n, smine_nelmts;        /*elements per strip    */    
     H5S_sel_iter_t mem_iter;            /*memory selection iteration info*/
     hbool_t	mem_iter_init=0;	/*memory selection iteration info has been initialized */
     H5S_sel_iter_t bkg_iter;            /*background iteration info*/
@@ -1683,8 +1681,7 @@ H5D_chunk_read(hsize_t nelmts, H5D_t *dataset,
     } /* end if */
     if (need_bkg && NULL==(bkg_buf=dxpl_cache->bkgr_buf)) {
         /* Allocate background buffer */
-        H5_CHECK_OVERFLOW((request_nelmts*dst_type_size),hsize_t,size_t);
-        if((bkg_buf=H5FL_BLK_CALLOC(type_conv,(size_t)(request_nelmts*dst_type_size)))==NULL)
+        if((bkg_buf=H5FL_BLK_CALLOC(type_conv,(request_nelmts*dst_type_size)))==NULL)
             HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for background conversion")
     } /* end if */
     
@@ -1873,9 +1870,9 @@ H5D_chunk_write(hsize_t nelmts, H5D_t *dataset,
     size_t	dst_type_size;	        /*size of destination type*/
     size_t	max_type_size;	        /* Size of largest source/destination type */
     size_t	target_size;		/*desired buffer size	*/
-    hsize_t	request_nelmts;		/*requested strip mine	*/
+    size_t	request_nelmts;		/*requested strip mine	*/
     hsize_t     smine_start;            /*strip mine start loc  */
-    hsize_t     n, smine_nelmts;        /*elements per strip    */    
+    size_t      n, smine_nelmts;        /*elements per strip    */    
     H5S_sel_iter_t mem_iter;            /*memory selection iteration info*/
     hbool_t	mem_iter_init=0;	/*memory selection iteration info has been initialized */
     H5S_sel_iter_t bkg_iter;            /*background iteration info*/
@@ -2041,8 +2038,7 @@ H5D_chunk_write(hsize_t nelmts, H5D_t *dataset,
     } /* end if */
     if (need_bkg && NULL==(bkg_buf=dxpl_cache->bkgr_buf)) {
         /* Allocate background buffer */
-        H5_CHECK_OVERFLOW((request_nelmts*dst_type_size),hsize_t,size_t);
-        if((bkg_buf=H5FL_BLK_CALLOC(type_conv,(size_t)(request_nelmts*dst_type_size)))==NULL)
+        if((bkg_buf=H5FL_BLK_CALLOC(type_conv,(request_nelmts*dst_type_size)))==NULL)
             HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for background conversion")
     } /* end if */
 
diff --git a/src/H5FDmulti.c b/src/H5FDmulti.c
index b0c5ea2..f863b55 100644
--- a/src/H5FDmulti.c
+++ b/src/H5FDmulti.c
@@ -791,7 +791,7 @@ H5FD_multi_sb_encode(H5FD_t *_file, char *name/*out*/,
     H5FD_multi_t	*file = (H5FD_multi_t*)_file;
     haddr_t		memb_eoa;
     unsigned char	*p;
-    hsize_t		nseen;
+    size_t		nseen;
     size_t		i;
     H5FD_mem_t		m;
     static const char *func="H5FD_multi_sb_encode";  /* Function Name for error reporting */
@@ -875,7 +875,7 @@ H5FD_multi_sb_decode(H5FD_t *_file, const char *name, const unsigned char *buf)
     char		x[2*H5FD_MEM_NTYPES*8];
     H5FD_mem_t		map[H5FD_MEM_NTYPES];
     int			i;
-    hsize_t		nseen=0;
+    size_t		nseen=0;
     hbool_t		map_changed=FALSE;
     hbool_t		in_use[H5FD_MEM_NTYPES];
     const char		*memb_name[H5FD_MEM_NTYPES];
@@ -918,8 +918,7 @@ H5FD_multi_sb_decode(H5FD_t *_file, const char *name, const unsigned char *buf)
 
     /* Decode Address and EOA values */
     assert(sizeof(haddr_t)<=8);
-    assert((nseen*2*8)==(hsize_t)((size_t)(nseen*2*8))); /*check for overflow*/
-    memcpy(x, buf, (size_t)(nseen*2*8));
+    memcpy(x, buf, (nseen*2*8));
     buf += nseen*2*8;
     if (H5Tconvert(H5T_STD_U64LE, H5T_NATIVE_HADDR, nseen*2, x, NULL, H5P_DEFAULT)<0)
         H5Epush_ret(func, H5E_ERR_CLS, H5E_DATATYPE, H5E_CANTCONVERT, "can't convert superblock info", -1)
diff --git a/src/H5Ofill.c b/src/H5Ofill.c
index 1870f85..ffe42a8 100644
--- a/src/H5Ofill.c
+++ b/src/H5Ofill.c
@@ -903,7 +903,7 @@ H5O_fill_convert(void *_fill, H5T_t *dset_type, hid_t dxpl_id)
             HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion");
 
         /* Do the conversion */
-        if (H5T_convert(tpath, src_id, dst_id, (hsize_t)1, 0, 0, buf, bkg, dxpl_id)<0)
+        if (H5T_convert(tpath, src_id, dst_id, 1, 0, 0, buf, bkg, dxpl_id)<0)
             HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "data type conversion failed");
 
         /* Update the fill message */
diff --git a/src/H5Pdcpl.c b/src/H5Pdcpl.c
index 604c6b4..edf386e 100644
--- a/src/H5Pdcpl.c
+++ b/src/H5Pdcpl.c
@@ -1333,7 +1333,7 @@ H5Pget_fill_value(hid_t plist_id, hid_t type_id, void *value/*out*/)
     HDmemcpy(buf, fill.buf, H5T_get_size(fill.type));
         
     /* Do the conversion */
-    if (H5T_convert(tpath, src_id, type_id, (hsize_t)1, 0, 0, buf, bkg, H5AC_dxpl_id)<0)
+    if (H5T_convert(tpath, src_id, type_id, 1, 0, 0, buf, bkg, H5AC_dxpl_id)<0)
         HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "data type conversion failed");
     if (buf!=value)
         HDmemcpy(value, buf, H5T_get_size(type));
diff --git a/src/H5Sprivate.h b/src/H5Sprivate.h
index 5dbb467..634b5df 100644
--- a/src/H5Sprivate.h
+++ b/src/H5Sprivate.h
@@ -235,17 +235,17 @@ H5_DLL herr_t H5S_select_fill(void *fill, size_t fill_size,
                                 const H5S_t *space, void *buf);
 H5_DLL herr_t H5S_select_fscat (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
     H5D_t *dset, const H5D_storage_t *store,
-    const H5S_t *file_space, H5S_sel_iter_t *file_iter, hsize_t nelmts,
+    const H5S_t *file_space, H5S_sel_iter_t *file_iter, size_t nelmts,
     const void *_buf);
-H5_DLL hsize_t H5S_select_fgath (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
+H5_DLL size_t H5S_select_fgath (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
     H5D_t *dset, const H5D_storage_t *store,
-    const H5S_t *file_space, H5S_sel_iter_t *file_iter, hsize_t nelmts,
+    const H5S_t *file_space, H5S_sel_iter_t *file_iter, size_t nelmts,
     void *buf);
 H5_DLL herr_t H5S_select_mscat (const void *_tscat_buf,
-        const H5S_t *space, H5S_sel_iter_t *iter, hsize_t nelmts,
+        const H5S_t *space, H5S_sel_iter_t *iter, size_t nelmts,
         const H5D_dxpl_cache_t *dxpl_cache, void *_buf/*out*/);
-H5_DLL hsize_t H5S_select_mgath (const void *_buf,
-        const H5S_t *space, H5S_sel_iter_t *iter, hsize_t nelmts,
+H5_DLL size_t H5S_select_mgath (const void *_buf,
+        const H5S_t *space, H5S_sel_iter_t *iter, size_t nelmts,
         const H5D_dxpl_cache_t *dxpl_cache, void *_tgath_buf/*out*/);
 H5_DLL herr_t H5S_select_read(H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
         H5D_t *dset, const H5D_storage_t *store,
diff --git a/src/H5Sselect.c b/src/H5Sselect.c
index d46e8df..dc2aed0 100644
--- a/src/H5Sselect.c
+++ b/src/H5Sselect.c
@@ -1627,7 +1627,7 @@ done:
 herr_t
 H5S_select_fscat (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
     H5D_t *dset, const H5D_storage_t *store, 
-    const H5S_t *space, H5S_sel_iter_t *iter, hsize_t nelmts,
+    const H5S_t *space, H5S_sel_iter_t *iter, size_t nelmts,
     const void *_buf)
 {
     const uint8_t *buf=_buf;       /* Alias for pointer arithmetic */
@@ -1639,7 +1639,6 @@ H5S_select_fscat (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
     size_t _len[H5D_XFER_HYPER_VECTOR_SIZE_DEF];              /* Array to store sequence lengths */
     size_t *len=NULL;              /* Array to store sequence lengths */
     size_t orig_mem_len, mem_len;  /* Length of sequence in memory */
-    size_t maxelem;                /* Number of elements in the buffer */
     size_t  nseq;                  /* Number of sequences generated */
     size_t  nelem;                 /* Number of elements used in sequences */
     herr_t  ret_value=SUCCEED;     /* Return value */
@@ -1668,13 +1667,10 @@ H5S_select_fscat (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
         off=_off;
     } /* end else */
 
-    /* Compute the number of bytes available in buffer */
-    H5_ASSIGN_OVERFLOW(maxelem,nelmts,hsize_t,size_t);
-
     /* Loop until all elements are written */
-    while(maxelem>0) {
+    while(nelmts>0) {
         /* Get list of sequences for selection to write */
-        if(H5S_SELECT_GET_SEQ_LIST(space,H5S_GET_SEQ_LIST_SORTED,iter,dxpl_cache->vec_size,maxelem,&nseq,&nelem,off,len)<0)
+        if(H5S_SELECT_GET_SEQ_LIST(space,H5S_GET_SEQ_LIST_SORTED,iter,dxpl_cache->vec_size,nelmts,&nseq,&nelem,off,len)<0)
             HGOTO_ERROR (H5E_INTERNAL, H5E_UNSUPPORTED, FAIL, "sequence length generation failed");
 
         /* Reset the current sequence information */
@@ -1690,7 +1686,7 @@ H5S_select_fscat (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
         buf += orig_mem_len;
 
         /* Decrement number of elements left to process */
-        maxelem -= nelem;
+        nelmts -= nelem;
     } /* end while */
 
 done:
@@ -1727,10 +1723,10 @@ done:
  *
  *-------------------------------------------------------------------------
  */
-hsize_t
+size_t
 H5S_select_fgath (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
     H5D_t *dset, const H5D_storage_t *store, 
-    const H5S_t *space, H5S_sel_iter_t *iter, hsize_t nelmts,
+    const H5S_t *space, H5S_sel_iter_t *iter, size_t nelmts,
     void *_buf/*out*/)
 {
     uint8_t *buf=_buf;          /* Alias for pointer arithmetic */
@@ -1742,10 +1738,9 @@ H5S_select_fgath (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
     size_t _len[H5D_XFER_HYPER_VECTOR_SIZE_DEF];           /* Array to store sequence lengths */
     size_t *len=NULL;           /* Pointer to sequence lengths */
     size_t orig_mem_len, mem_len;       /* Length of sequence in memory */
-    size_t maxelem;             /* Number of elements in the buffer */
     size_t nseq;                /* Number of sequences generated */
     size_t nelem;               /* Number of elements used in sequences */
-    hsize_t ret_value=nelmts;   /* Return value */
+    size_t ret_value=nelmts;    /* Return value */
 
     FUNC_ENTER_NOAPI(H5S_select_fgath, 0);
 
@@ -1770,13 +1765,10 @@ H5S_select_fgath (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
         off=_off;
     } /* end else */
 
-    /* Compute the number of elements available in buffer */
-    H5_ASSIGN_OVERFLOW(maxelem,nelmts,hsize_t,size_t);
-
     /* Loop until all elements are written */
-    while(maxelem>0) {
+    while(nelmts>0) {
         /* Get list of sequences for selection to write */
-        if(H5S_SELECT_GET_SEQ_LIST(space,H5S_GET_SEQ_LIST_SORTED,iter,dxpl_cache->vec_size,maxelem,&nseq,&nelem,off,len)<0)
+        if(H5S_SELECT_GET_SEQ_LIST(space,H5S_GET_SEQ_LIST_SORTED,iter,dxpl_cache->vec_size,nelmts,&nseq,&nelem,off,len)<0)
             HGOTO_ERROR (H5E_INTERNAL, H5E_UNSUPPORTED, 0, "sequence length generation failed");
 
         /* Reset the current sequence information */
@@ -1792,7 +1784,7 @@ H5S_select_fgath (H5F_t *f, const H5D_dxpl_cache_t *dxpl_cache, hid_t dxpl_id,
         buf += orig_mem_len;
 
         /* Decrement number of elements left to process */
-        maxelem -= nelem;
+        nelmts -= nelem;
     } /* end while */
 
 done:
@@ -1825,7 +1817,7 @@ done:
  */
 herr_t
 H5S_select_mscat (const void *_tscat_buf, const H5S_t *space,
-    H5S_sel_iter_t *iter, hsize_t nelmts, const H5D_dxpl_cache_t *dxpl_cache,
+    H5S_sel_iter_t *iter, size_t nelmts, const H5D_dxpl_cache_t *dxpl_cache,
     void *_buf/*out*/)
 {
     uint8_t *buf=(uint8_t *)_buf;   /* Get local copies for address arithmetic */
@@ -1835,7 +1827,6 @@ H5S_select_mscat (const void *_tscat_buf, const H5S_t *space,
     size_t _len[H5D_XFER_HYPER_VECTOR_SIZE_DEF];           /* Array to store sequence lengths */
     size_t *len=NULL;           /* Pointer to sequence lengths */
     size_t curr_len;            /* Length of bytes left to process in sequence */
-    size_t maxelem;             /* Number of elements in the buffer */
     size_t nseq;                /* Number of sequences generated */
     size_t curr_seq;            /* Current sequence being processed */
     size_t nelem;               /* Number of elements used in sequences */
@@ -1862,13 +1853,10 @@ H5S_select_mscat (const void *_tscat_buf, const H5S_t *space,
         off=_off;
     } /* end else */
 
-    /* Compute the number of elements available in buffer */
-    H5_ASSIGN_OVERFLOW(maxelem,nelmts,hsize_t,size_t);
-
     /* Loop until all elements are written */
-    while(maxelem>0) {
+    while(nelmts>0) {
         /* Get list of sequences for selection to write */
-        if(H5S_SELECT_GET_SEQ_LIST(space,0,iter,dxpl_cache->vec_size,maxelem,&nseq,&nelem,off,len)<0)
+        if(H5S_SELECT_GET_SEQ_LIST(space,0,iter,dxpl_cache->vec_size,nelmts,&nseq,&nelem,off,len)<0)
             HGOTO_ERROR (H5E_INTERNAL, H5E_UNSUPPORTED, 0, "sequence length generation failed");
 
         /* Loop, while sequences left to process */
@@ -1883,7 +1871,7 @@ H5S_select_mscat (const void *_tscat_buf, const H5S_t *space,
         } /* end for */
 
         /* Decrement number of elements left to process */
-        maxelem -= nelem;
+        nelmts -= nelem;
     } /* end while */
 
 done:
@@ -1916,9 +1904,9 @@ done:
  *
  *-------------------------------------------------------------------------
  */
-hsize_t
+size_t
 H5S_select_mgath (const void *_buf, const H5S_t *space,
-    H5S_sel_iter_t *iter, hsize_t nelmts, const H5D_dxpl_cache_t *dxpl_cache,
+    H5S_sel_iter_t *iter, size_t nelmts, const H5D_dxpl_cache_t *dxpl_cache,
     void *_tgath_buf/*out*/)
 {
     const uint8_t *buf=(const uint8_t *)_buf;   /* Get local copies for address arithmetic */
@@ -1928,11 +1916,10 @@ H5S_select_mgath (const void *_buf, const H5S_t *space,
     size_t _len[H5D_XFER_HYPER_VECTOR_SIZE_DEF];           /* Array to store sequence lengths */
     size_t *len=NULL;           /* Pointer to sequence lengths */
     size_t curr_len;            /* Length of bytes left to process in sequence */
-    size_t maxelem;             /* Number of elements in the buffer */
     size_t nseq;                /* Number of sequences generated */
     size_t curr_seq;            /* Current sequence being processed */
     size_t nelem;               /* Number of elements used in sequences */
-    hsize_t ret_value=nelmts;   /* Number of elements gathered */
+    size_t ret_value=nelmts;    /* Number of elements gathered */
 
     FUNC_ENTER_NOAPI(H5S_select_mgath, 0);
 
@@ -1955,13 +1942,10 @@ H5S_select_mgath (const void *_buf, const H5S_t *space,
         off=_off;
     } /* end else */
 
-    /* Compute the number of elements available in buffer */
-    H5_ASSIGN_OVERFLOW(maxelem,nelmts,hsize_t,size_t);
-
     /* Loop until all elements are written */
-    while(maxelem>0) {
+    while(nelmts>0) {
         /* Get list of sequences for selection to write */
-        if(H5S_SELECT_GET_SEQ_LIST(space,0,iter,dxpl_cache->vec_size,maxelem,&nseq,&nelem,off,len)<0)
+        if(H5S_SELECT_GET_SEQ_LIST(space,0,iter,dxpl_cache->vec_size,nelmts,&nseq,&nelem,off,len)<0)
             HGOTO_ERROR (H5E_INTERNAL, H5E_UNSUPPORTED, 0, "sequence length generation failed");
 
         /* Loop, while sequences left to process */
@@ -1976,7 +1960,7 @@ H5S_select_mgath (const void *_buf, const H5S_t *space,
         } /* end for */
 
         /* Decrement number of elements left to process */
-        maxelem -= nelem;
+        nelmts -= nelem;
     } /* end while */
 
 done:
diff --git a/src/H5T.c b/src/H5T.c
index dc5b8e0..d4d5608 100644
--- a/src/H5T.c
+++ b/src/H5T.c
@@ -1272,7 +1272,7 @@ H5T_term_interface(void)
 		H5T_print_stats(path, &nprint/*in,out*/);
 		path->cdata.command = H5T_CONV_FREE;
 		if ((path->func)(FAIL, FAIL, &(path->cdata),
-				 (hsize_t)0, 0, 0, NULL, NULL,H5AC_dxpl_id)<0) {
+				 0, 0, 0, NULL, NULL,H5AC_dxpl_id)<0) {
 #ifdef H5T_DEBUG
 		    if (H5DEBUG(T)) {
 			fprintf (H5DEBUG(T), "H5T: conversion function "
@@ -1995,7 +1995,7 @@ H5Tset_size(hid_t type_id, size_t size)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "size must be positive");
     if (size == H5T_VARIABLE && dt->type!=H5T_STRING)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "only strings may be variable length");
-    if (H5T_ENUM==dt->type && dt->u.enumer.nmembs>0) 
+    if (H5T_ENUM==dt->type && dt->u.enumer.nmembs>0)
 	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not allowed after members are defined");
     if (H5T_REFERENCE==dt->type)
 	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "operation not defined for this datatype");
@@ -2188,7 +2188,7 @@ H5T_register(H5T_pers_t pers, const char *name, H5T_t *src, H5T_t *dst,
                 HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register data types for conv query");
             HDmemset(&cdata, 0, sizeof cdata);
             cdata.command = H5T_CONV_INIT;
-            if ((func)(tmp_sid, tmp_did, &cdata, (hsize_t)0, 0, 0, NULL, NULL, dxpl_id)<0) {
+            if ((func)(tmp_sid, tmp_did, &cdata, 0, 0, 0, NULL, NULL, dxpl_id)<0) {
                 H5I_dec_ref(tmp_sid);
                 H5I_dec_ref(tmp_did);
                 tmp_sid = tmp_did = -1;
@@ -2215,7 +2215,7 @@ H5T_register(H5T_pers_t pers, const char *name, H5T_t *src, H5T_t *dst,
             /* Free old path */
             H5T_print_stats(old_path, &nprint);
             old_path->cdata.command = H5T_CONV_FREE;
-            if ((old_path->func)(tmp_sid, tmp_did, &(old_path->cdata), (hsize_t)0, 0, 0, NULL, NULL, dxpl_id)<0) {
+            if ((old_path->func)(tmp_sid, tmp_did, &(old_path->cdata), 0, 0, 0, NULL, NULL, dxpl_id)<0) {
 #ifdef H5T_DEBUG
 		if (H5DEBUG(T)) {
 		    fprintf (H5DEBUG(T), "H5T: conversion function 0x%08lx "
@@ -2376,7 +2376,7 @@ H5T_unregister(H5T_pers_t pers, const char *name, H5T_t *src, H5T_t *dst,
         /* Shut down path */
         H5T_print_stats(path, &nprint);
         path->cdata.command = H5T_CONV_FREE;
-        if ((path->func)(FAIL, FAIL, &(path->cdata), (hsize_t)0, 0, 0, NULL, NULL,
+        if ((path->func)(FAIL, FAIL, &(path->cdata), 0, 0, 0, NULL, NULL,
                          dxpl_id)<0) {
 #ifdef H5T_DEBUG
 	    if (H5DEBUG(T)) {
@@ -2520,7 +2520,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5Tconvert(hid_t src_id, hid_t dst_id, hsize_t nelmts, void *buf,
+H5Tconvert(hid_t src_id, hid_t dst_id, size_t nelmts, void *buf,
 	    void *background, hid_t dxpl_id)
 {
     H5T_path_t		*tpath=NULL;		/*type conversion info	*/
@@ -2633,6 +2633,7 @@ H5T_create(H5T_class_t type, size_t size)
 
         case H5T_ARRAY:  /* Array datatype */
             HGOTO_ERROR(H5E_DATATYPE, H5E_UNSUPPORTED, NULL, "base type required - use H5Tarray_create()");
+
         default:
             HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, NULL, "unknown data type class");
     }
@@ -2727,7 +2728,7 @@ H5T_open (H5G_entry_t *loc, const char *name, hid_t dxpl_id)
     /* Open the datatype object */
     if ((dt=H5T_open_oid(&ent, dxpl_id)) ==NULL)
         HGOTO_ERROR(H5E_DATATYPE, H5E_NOTFOUND, NULL, "not found");
-    
+
     /* Mark any datatypes as being in memory now */
     if (H5T_set_loc(dt, NULL, H5T_LOC_MEMORY)<0)
         HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "invalid datatype location")
@@ -3808,7 +3809,7 @@ H5T_path_find(const H5T_t *src, const H5T_t *dst, const char *name,
 	HDstrcpy(H5T_g.path[0]->name, "no-op");
 	H5T_g.path[0]->func = H5T_conv_noop;
 	H5T_g.path[0]->cdata.command = H5T_CONV_INIT;
-	if (H5T_conv_noop(FAIL, FAIL, &(H5T_g.path[0]->cdata), (hsize_t)0, 0, 0,
+	if (H5T_conv_noop(FAIL, FAIL, &(H5T_g.path[0]->cdata), 0, 0, 0,
 			  NULL, NULL, dxpl_id)<0) {
 #ifdef H5T_DEBUG
 	    if (H5DEBUG(T)) {
@@ -3896,7 +3897,7 @@ H5T_path_find(const H5T_t *src, const H5T_t *dst, const char *name,
                   H5T_copy(path->dst, H5T_COPY_ALL)))<0)
 	    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, NULL, "unable to register destination conversion type for query");
 	path->cdata.command = H5T_CONV_INIT;
-	if ((func)(src_id, dst_id, &(path->cdata), (hsize_t)0, 0, 0, NULL, NULL,
+	if ((func)(src_id, dst_id, &(path->cdata), 0, 0, 0, NULL, NULL,
                    dxpl_id)<0)
 	    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to initialize conversion function");
 	if (src_id>=0) H5I_dec_ref(src_id);
@@ -3925,7 +3926,7 @@ H5T_path_find(const H5T_t *src, const H5T_t *dst, const char *name,
 	    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, NULL, "unable to register conversion types for query");
 	path->cdata.command = H5T_CONV_INIT;
 	if ((H5T_g.soft[i].func) (src_id, dst_id, &(path->cdata),
-                                  (hsize_t)0, 0, 0, NULL, NULL, dxpl_id)<0) {
+                                  0, 0, 0, NULL, NULL, dxpl_id)<0) {
 	    HDmemset (&(path->cdata), 0, sizeof(H5T_cdata_t));
 	    H5E_clear(NULL); /*ignore the error*/
 	} else {
@@ -3968,7 +3969,7 @@ H5T_path_find(const H5T_t *src, const H5T_t *dst, const char *name,
 	assert(table==H5T_g.path[md]);
 	H5T_print_stats(table, &nprint/*in,out*/);
 	table->cdata.command = H5T_CONV_FREE;
-	if ((table->func)(FAIL, FAIL, &(table->cdata), (hsize_t)0, 0, 0, NULL, NULL,
+	if ((table->func)(FAIL, FAIL, &(table->cdata), 0, 0, 0, NULL, NULL,
                           dxpl_id)<0) {
 #ifdef H5T_DEBUG
 	    if (H5DEBUG(T)) {
@@ -4114,7 +4115,7 @@ H5T_path_bkg(const H5T_path_t *p)
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_convert(H5T_path_t *tpath, hid_t src_id, hid_t dst_id, hsize_t nelmts,
+H5T_convert(H5T_path_t *tpath, hid_t src_id, hid_t dst_id, size_t nelmts,
 	    size_t buf_stride, size_t bkg_stride, void *buf, void *bkg,
             hid_t dset_xfer_plist)
 {
diff --git a/src/H5Tconv.c b/src/H5Tconv.c
index 8d3e44a..a8d1e50 100644
--- a/src/H5Tconv.c
+++ b/src/H5Tconv.c
@@ -48,8 +48,8 @@ typedef struct H5T_enum_struct_t {
 
 /* Conversion data for the hardware conversion functions */
 typedef struct H5T_conv_hw_t {
-    hsize_t	s_aligned;		/*number source elements aligned     */
-    hsize_t	d_aligned;		/*number destination elements aligned*/
+    size_t	s_aligned;		/*number source elements aligned     */
+    size_t	d_aligned;		/*number destination elements aligned*/
 } H5T_conv_hw_t;
 
 /* Interface initialization */
@@ -676,7 +676,7 @@ static herr_t H5T_reverse_order(uint8_t *rev, uint8_t *s, size_t size, H5T_order
  */
 herr_t
 H5T_conv_noop(hid_t UNUSED src_id, hid_t UNUSED dst_id, H5T_cdata_t *cdata,
-	      hsize_t UNUSED nelmts, size_t UNUSED buf_stride,
+	      size_t UNUSED nelmts, size_t UNUSED buf_stride,
               size_t UNUSED bkg_stride, void UNUSED *buf,
 	      void UNUSED *background, hid_t UNUSED dxpl_id)
 {
@@ -725,14 +725,14 @@ done:
  */
 herr_t
 H5T_conv_order_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-                   hsize_t nelmts, size_t buf_stride,
+                   size_t nelmts, size_t buf_stride,
                    size_t UNUSED bkg_stride, void *_buf,
                    void UNUSED *background, hid_t UNUSED dxpl_id)
 {
     uint8_t	*buf = (uint8_t*)_buf;
     H5T_t	*src = NULL;
     H5T_t	*dst = NULL;
-    hsize_t     i;
+    size_t      i;
     herr_t      ret_value=SUCCEED;       /* Return value */
 
     FUNC_ENTER_NOAPI(H5T_conv_order_opt, FAIL);
@@ -1130,14 +1130,14 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_order(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_order(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
 	       size_t buf_stride, size_t UNUSED bkg_stride, void *_buf,
                void UNUSED *background, hid_t UNUSED dxpl_id)
 {
     uint8_t	*buf = (uint8_t*)_buf;
     H5T_t	*src = NULL;
     H5T_t	*dst = NULL;
-    hsize_t	i;
+    size_t	i;
     size_t	j, md;
     herr_t      ret_value=SUCCEED;       /* Return value */
 
@@ -1227,15 +1227,15 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_b_b(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_b_b(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
 	     size_t buf_stride, size_t UNUSED bkg_stride, void *_buf,
              void UNUSED *background, hid_t dxpl_id)
 {
     uint8_t	*buf = (uint8_t*)_buf;
     H5T_t	*src=NULL, *dst=NULL;	/*source and dest data types	*/
     int	direction;		/*direction of traversal	*/
-    hsize_t	elmtno;			/*element number		*/
-    hsize_t	olap;			/*num overlapping elements	*/
+    size_t	elmtno;			/*element number		*/
+    size_t	olap;			/*num overlapping elements	*/
     size_t	half_size;		/*1/2 of total size for swapping*/
     uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
     uint8_t	dbuf[256];		/*temp destination buffer	*/
@@ -1617,7 +1617,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
 		size_t buf_stride, size_t bkg_stride, void *_buf, void *_bkg,
                 hid_t dxpl_id)
 {
@@ -1631,7 +1631,7 @@ H5T_conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     H5T_cmemb_t	*dst_memb = NULL;	/*destination struct memb desc.	*/
     size_t	offset;			/*byte offset wrt struct	*/
     size_t	src_delta;	    /*source stride	*/
-    hsize_t	elmtno;
+    size_t	elmtno;
     unsigned	u;		/*counters			*/
     int	i;			/*counters			*/
     H5T_conv_struct_t *priv = (H5T_conv_struct_t *)(cdata->priv);
@@ -1723,7 +1723,7 @@ H5T_conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
                     if (dst_memb->size <= src_memb->size) {
                         if (H5T_convert(priv->memb_path[u], priv->src_memb_id[u],
                                 priv->dst_memb_id[src2dst[u]],
-                                (hsize_t)1, 0, 0, /*no striding (packed array)*/
+                                1, 0, 0, /*no striding (packed array)*/
                                 xbuf+src_memb->offset, xbkg+dst_memb->offset,
                                 dxpl_id)<0)
                             HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert compound data type member");
@@ -1753,7 +1753,7 @@ H5T_conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
                         offset -= src_memb->size;
                         if (H5T_convert(priv->memb_path[i],
                                     priv->src_memb_id[i], priv->dst_memb_id[src2dst[i]],
-                                    (hsize_t)1, 0, 0, /*no striding (packed array)*/
+                                    1, 0, 0, /*no striding (packed array)*/
                                     xbuf+offset, xbkg+dst_memb->offset,
                                     dxpl_id)<0)
                             HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert compound data type member");
@@ -1851,7 +1851,7 @@ done:
  */
 herr_t
 H5T_conv_struct_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-    hsize_t nelmts, size_t buf_stride, size_t bkg_stride, void *_buf,
+    size_t nelmts, size_t buf_stride, size_t bkg_stride, void *_buf,
     void *_bkg, hid_t dxpl_id)
 {
     uint8_t	*buf = (uint8_t *)_buf;	/*cast for pointer arithmetic	*/
@@ -1864,7 +1864,7 @@ H5T_conv_struct_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
     H5T_cmemb_t	*src_memb = NULL;	/*source struct member descript.*/
     H5T_cmemb_t	*dst_memb = NULL;	/*destination struct memb desc.	*/
     size_t	offset;			/*byte offset wrt struct	*/
-    hsize_t	elmtno;			/*element counter		*/
+    size_t	elmtno;			/*element counter		*/
     unsigned	u;			/*counters			*/
     int	i;			    /*counters			*/
     H5T_conv_struct_t *priv = NULL;	/*private data			*/
@@ -2220,7 +2220,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_enum(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_enum(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
 	      size_t buf_stride, size_t UNUSED bkg_stride, void *_buf,
               void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
@@ -2229,7 +2229,7 @@ H5T_conv_enum(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     uint8_t	*s=NULL, *d=NULL;	/*src and dst BUF pointers	*/
     int	src_delta, dst_delta;	/*conversion strides		*/
     int	n;			/*src value cast as native int	*/
-    hsize_t	i;			/*counters			*/
+    size_t	i;			/*counters			*/
     H5T_enum_struct_t *priv = (H5T_enum_struct_t*)(cdata->priv);
     H5P_genplist_t      *plist;         /*property list pointer         */
     H5T_conv_cb_t       cb_struct;      /*conversion callback structure */
@@ -2422,7 +2422,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_vlen(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_vlen(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
 	      size_t buf_stride, size_t bkg_stride, void *buf,
               void *bkg, hid_t dxpl_id)
 {
@@ -2440,16 +2440,15 @@ H5T_conv_vlen(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     ssize_t	s_stride, d_stride;	/*src and dst strides		*/
     ssize_t	b_stride;	        /*bkg stride			*/
     size_t      safe;                   /*how many elements are safe to process in each pass */
-    hssize_t 	seq_len;                /*the number of elements in the current sequence*/
-    hsize_t	bg_seq_len=0, parent_seq_len=0;
+    ssize_t 	seq_len;                /*the number of elements in the current sequence*/
+    size_t	bg_seq_len=0;
     size_t	src_base_size, dst_base_size;/*source & destination base size*/
     void	*conv_buf=NULL;     	/*temporary conversion buffer 	     */
     size_t	conv_buf_size=0;  	/*size of conversion buffer in bytes */
     void	*tmp_buf=NULL;     	/*temporary background buffer 	     */
     size_t	tmp_buf_size=0;	        /*size of temporary bkg buffer	     */
     hbool_t     nested=FALSE;           /*flag of nested VL case             */
-    hsize_t	elmtno;			/*element number counter	     */
-    hsize_t     i;
+    size_t	elmtno;			/*element number counter	     */
     herr_t      ret_value=SUCCEED;       /* Return value */
 
     FUNC_ENTER_NOAPI(H5T_conv_vlen, FAIL);
@@ -2594,9 +2593,8 @@ H5T_conv_vlen(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
                         else {
                             size_t	src_size, dst_size;     /*source & destination total size in bytes*/
 
-                            H5_CHECK_OVERFLOW(seq_len,hssize_t,size_t);
-                            src_size=(size_t)seq_len*src_base_size;
-                            dst_size=(size_t)seq_len*dst_base_size;
+                            src_size=seq_len*src_base_size;
+                            dst_size=seq_len*dst_base_size;
 
                             /* Check if conversion buffer is large enough, resize if
                              * necessary */      
@@ -2629,9 +2627,8 @@ H5T_conv_vlen(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
                                 UINT32DECODE(tmp, bg_seq_len);
 
                                 if(bg_seq_len>0) {
-                                    H5_CHECK_OVERFLOW( bg_seq_len*MAX(src_base_size,dst_base_size) ,hsize_t,size_t);
-                                    if(tmp_buf_size<(size_t)(bg_seq_len*MAX(src_base_size, dst_base_size))) {
-                                        tmp_buf_size=(size_t)(bg_seq_len*MAX(src_base_size, dst_base_size));
+                                    if(tmp_buf_size<(bg_seq_len*MAX(src_base_size, dst_base_size))) {
+                                        tmp_buf_size=(bg_seq_len*MAX(src_base_size, dst_base_size));
                                         if((tmp_buf=H5FL_BLK_REALLOC(vlen_seq,tmp_buf, tmp_buf_size))==NULL)
                                             HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for type conversion");
                                     }
@@ -2642,30 +2639,32 @@ H5T_conv_vlen(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
                                 } /* end if */
 
                                 /* If the sequence gets shorter, pad out the original sequence with zeros */
-                                H5_CHECK_OVERFLOW(bg_seq_len,hsize_t,hssize_t);
-                                if((hssize_t)bg_seq_len<seq_len) {
-                                    H5_CHECK_OVERFLOW((seq_len-bg_seq_len),hsize_t,size_t);
-                                    HDmemset((uint8_t *)tmp_buf+dst_base_size*bg_seq_len,0,(size_t)(seq_len-bg_seq_len)*dst_base_size);
+                                H5_CHECK_OVERFLOW(bg_seq_len,size_t,ssize_t);
+                                if((ssize_t)bg_seq_len<seq_len) {
+                                    HDmemset((uint8_t *)tmp_buf+dst_base_size*bg_seq_len,0,(seq_len-bg_seq_len)*dst_base_size);
                                 } /* end if */
                             } /* end if */
 
                             /* Convert VL sequence */
-                            H5_CHECK_OVERFLOW(seq_len,hssize_t,hsize_t);
-                            if (H5T_convert(tpath, tsrc_id, tdst_id, (hsize_t)seq_len, 0, 0, conv_buf, tmp_buf, dxpl_id)<0)
+                            H5_CHECK_OVERFLOW(seq_len,ssize_t,size_t);
+                            if (H5T_convert(tpath, tsrc_id, tdst_id, (size_t)seq_len, 0, 0, conv_buf, tmp_buf, dxpl_id)<0)
                                 HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "datatype conversion failed");
                         } /* end if */
 
                         /* Write sequence to destination location */
-                        if((*(dst->u.vlen.write))(dst->u.vlen.f,dxpl_id,&vl_alloc_info,d,conv_buf, b, (hsize_t)seq_len,(hsize_t)dst_base_size)<0)
+                        if((*(dst->u.vlen.write))(dst->u.vlen.f,dxpl_id,&vl_alloc_info,d,conv_buf, b, (size_t)seq_len, dst_base_size)<0)
                             HGOTO_ERROR(H5E_DATATYPE, H5E_WRITEERROR, FAIL, "can't write VL data");
 
                         if(!noop_conv) {
                             /* For nested VL case, free leftover heap objects from the deeper level if the length of new data elements is shorter than the old data elements.*/
-                            H5_CHECK_OVERFLOW(bg_seq_len,hsize_t,hssize_t);
-                            if(nested && seq_len<(hssize_t)bg_seq_len) {
+                            H5_CHECK_OVERFLOW(bg_seq_len,size_t,ssize_t);
+                            if(nested && seq_len<(ssize_t)bg_seq_len) {
+                                size_t parent_seq_len;
+                                size_t     u;
+
                                 uint8_t *tmp_p=tmp_buf;
                                 tmp_p += seq_len*dst_base_size;
-                                for(i=0; i<(bg_seq_len-seq_len); i++) {
+                                for(u=0; u<(bg_seq_len-seq_len); u++) {
                                     UINT32DECODE(tmp_p, parent_seq_len);
                                     if(parent_seq_len>0) {
                                         H5F_addr_decode(dst->u.vlen.f, (const uint8_t **)&tmp_p, &(parent_hobjid.addr));
@@ -2731,7 +2730,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_array(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_array(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
 	      size_t buf_stride, size_t bkg_stride, void *_buf,
               void UNUSED *_bkg, hid_t dxpl_id)
 {
@@ -2742,7 +2741,7 @@ H5T_conv_array(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     uint8_t	*sp, *dp;	        /*source and dest traversal ptrs     */
     size_t	src_delta, dst_delta;	/*source & destination stride	     */
     int	        direction;		/*direction of traversal	     */
-    hsize_t	elmtno;			/*element number counter	     */
+    size_t	elmtno;			/*element number counter	     */
     int         i;                      /* local index variable */
     void	*bkg_buf=NULL;     	/*temporary background buffer 	     */
     size_t	bkg_buf_size=0;	        /*size of background buffer in bytes */
@@ -2839,7 +2838,7 @@ H5T_conv_array(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
                 HDmemmove(dp, sp, src->size);
 
                 /* Convert array */
-                if (H5T_convert(tpath, tsrc_id, tdst_id, (hsize_t)src->u.array.nelem, 0, bkg_stride, dp, bkg_buf, dxpl_id)<0)
+                if (H5T_convert(tpath, tsrc_id, tdst_id, src->u.array.nelem, 0, bkg_stride, dp, bkg_buf, dxpl_id)<0)
                     HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "datatype conversion failed");
 
                 /* Advance the source & destination pointers */
@@ -2896,16 +2895,16 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_i_i (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_i_i (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
 	      size_t buf_stride, size_t UNUSED bkg_stride, void *buf,
               void UNUSED *bkg, hid_t dxpl_id)
 {
     H5T_t	*src = NULL;		/*source data type		*/
     H5T_t	*dst = NULL;		/*destination data type		*/
     int		direction;		/*direction of traversal	*/
-    hsize_t	elmtno;			/*element number		*/
+    size_t	elmtno;			/*element number		*/
     size_t	half_size;		/*half the type size		*/
-    hsize_t	olap;			/*num overlapping elements	*/
+    size_t	olap;			/*num overlapping elements	*/
     uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
     uint8_t     *src_rev;               /*order-reversed source buffer  */
     uint8_t	dbuf[64];		/*temp destination buffer	*/
@@ -3304,7 +3303,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_f_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_f_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
     size_t buf_stride, size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
     hid_t dxpl_id)
 {
@@ -3314,9 +3313,9 @@ H5T_conv_f_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     H5T_atomic_t src;			/*atomic source info		*/
     H5T_atomic_t dst;			/*atomic destination info	*/
     int	direction;		        /*forward or backward traversal	*/
-    hsize_t	elmtno;			/*element number		*/
+    size_t	elmtno;			/*element number		*/
     size_t	half_size;		/*half the type size		*/
-    hsize_t	olap;			/*num overlapping elements	*/
+    size_t	olap;			/*num overlapping elements	*/
     ssize_t	bitno;			/*bit number			*/
     uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
     uint8_t     *src_rev;               /*order-reversed source buffer  */
@@ -3330,7 +3329,7 @@ H5T_conv_f_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     size_t	mrsh;			/*amount to right shift mantissa*/
     hbool_t	carry=0;		/*carry after rounding mantissa	*/
     size_t	i;			/*miscellaneous counters	*/
-    hsize_t	implied;		/*destination implied bits	*/
+    size_t	implied;		/*destination implied bits	*/
     H5P_genplist_t      *plist;         /*property list pointer         */
     H5T_conv_cb_t       cb_struct={NULL, NULL};      /*conversion callback structure */
     H5T_conv_ret_t      except_ret;     /*return of callback function   */
@@ -3707,7 +3706,7 @@ H5T_conv_f_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
                  * If we had used a temporary buffer for the destination then we
                  * should copy the value to the true destination buffer.
                  */
-            next:
+            /* next: */
                 if (d==dbuf)
                     HDmemcpy (dp, d, dst_p->size);
                 if (buf_stride) {
@@ -3751,15 +3750,15 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_s_s (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_s_s (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
 	      size_t buf_stride, size_t UNUSED bkg_stride, void *buf,
               void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     H5T_t	*src=NULL;		/*source data type		*/
     H5T_t	*dst=NULL;		/*destination data type		*/
     int	direction;		/*direction of traversal	*/
-    hsize_t	elmtno;			/*element number		*/
-    hsize_t	olap;			/*num overlapping elements	*/
+    size_t	elmtno;			/*element number		*/
+    size_t	olap;			/*num overlapping elements	*/
     size_t	nchars=0;		/*number of characters copied	*/
     uint8_t	*s, *sp, *d, *dp;	/*src and dst traversal pointers*/
     uint8_t	*dbuf=NULL;		/*temp buf for overlap convers.	*/
@@ -3974,7 +3973,7 @@ done:
  */
 herr_t
 H5T_conv_schar_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                      hid_t UNUSED dxpl_id)
 {
@@ -4007,7 +4006,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                      hid_t UNUSED dxpl_id)
 {
@@ -4040,7 +4039,7 @@ done:
  */
 herr_t
 H5T_conv_schar_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                      hid_t UNUSED dxpl_id)
 {
@@ -4073,7 +4072,7 @@ done:
  */
 herr_t
 H5T_conv_schar_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -4106,7 +4105,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                      hid_t UNUSED dxpl_id)
 {
@@ -4139,7 +4138,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -4172,7 +4171,7 @@ done:
  */
 herr_t
 H5T_conv_schar_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		   size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                    void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -4204,7 +4203,7 @@ done:
  */
 herr_t
 H5T_conv_schar_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -4236,7 +4235,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		   size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                    void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -4268,7 +4267,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -4300,7 +4299,7 @@ done:
  */
 herr_t
 H5T_conv_schar_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -4332,7 +4331,7 @@ done:
  */
 herr_t
 H5T_conv_schar_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4365,7 +4364,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -4397,7 +4396,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4430,7 +4429,7 @@ done:
  */
 herr_t
 H5T_conv_schar_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4463,7 +4462,7 @@ done:
  */
 herr_t
 H5T_conv_schar_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -4496,7 +4495,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4529,7 +4528,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -4562,7 +4561,7 @@ done:
  */
 herr_t
 H5T_conv_short_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4595,7 +4594,7 @@ done:
  */
 herr_t
 H5T_conv_short_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4628,7 +4627,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -4661,7 +4660,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -4694,7 +4693,7 @@ done:
  */
 herr_t
 H5T_conv_short_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -4727,7 +4726,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -4760,7 +4759,7 @@ done:
  */
 herr_t
 H5T_conv_short_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride,
+		   size_t nelmts, size_t buf_stride,
                    size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		   hid_t UNUSED dxpl_id)
 {
@@ -4793,7 +4792,7 @@ done:
  */
 herr_t
 H5T_conv_short_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride,
+		    size_t nelmts, size_t buf_stride,
                     size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		    hid_t UNUSED dxpl_id)
 {
@@ -4826,7 +4825,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride,
+		    size_t nelmts, size_t buf_stride,
                     size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		    hid_t UNUSED dxpl_id)
 {
@@ -4859,7 +4858,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4892,7 +4891,7 @@ done:
  */
 herr_t
 H5T_conv_short_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride,
+		    size_t nelmts, size_t buf_stride,
                     size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		    hid_t UNUSED dxpl_id)
 {
@@ -4925,7 +4924,7 @@ done:
  */
 herr_t
 H5T_conv_short_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4958,7 +4957,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -4991,7 +4990,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -5024,7 +5023,7 @@ done:
  */
 herr_t
 H5T_conv_short_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -5057,7 +5056,7 @@ done:
  */
 herr_t
 H5T_conv_short_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -5090,7 +5089,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -5123,7 +5122,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -5156,7 +5155,7 @@ done:
  */
 herr_t
 H5T_conv_int_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride,
+		   size_t nelmts, size_t buf_stride,
                    size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		   hid_t UNUSED dxpl_id)
 {
@@ -5189,7 +5188,7 @@ done:
  */
 herr_t
 H5T_conv_int_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride,
+		   size_t nelmts, size_t buf_stride,
                    size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		   hid_t UNUSED dxpl_id)
 {
@@ -5222,7 +5221,7 @@ done:
  */
 herr_t
 H5T_conv_uint_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride,
+		    size_t nelmts, size_t buf_stride,
                     size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		    hid_t UNUSED dxpl_id)
 {
@@ -5255,7 +5254,7 @@ done:
  */
 herr_t
 H5T_conv_uint_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride,
+		    size_t nelmts, size_t buf_stride,
                     size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		    hid_t UNUSED dxpl_id)
 {
@@ -5288,7 +5287,7 @@ done:
  */
 herr_t
 H5T_conv_int_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride,
+		   size_t nelmts, size_t buf_stride,
                    size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		   hid_t UNUSED dxpl_id)
 {
@@ -5321,7 +5320,7 @@ done:
  */
 herr_t
 H5T_conv_int_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride,
+		    size_t nelmts, size_t buf_stride,
                     size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		    hid_t UNUSED dxpl_id)
 {
@@ -5354,7 +5353,7 @@ done:
  */
 herr_t
 H5T_conv_uint_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride,
+		    size_t nelmts, size_t buf_stride,
                     size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		    hid_t UNUSED dxpl_id)
 {
@@ -5387,7 +5386,7 @@ done:
  */
 herr_t
 H5T_conv_uint_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -5420,7 +5419,7 @@ done:
  */
 herr_t
 H5T_conv_int_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		  hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		  size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                   void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5452,7 +5451,7 @@ done:
  */
 herr_t
 H5T_conv_uint_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		  hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		  size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                   void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5484,7 +5483,7 @@ done:
  */
 herr_t
 H5T_conv_int_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		  hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		  size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                   void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5516,7 +5515,7 @@ done:
  */
 herr_t
 H5T_conv_int_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		   size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                    void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5548,7 +5547,7 @@ done:
  */
 herr_t
 H5T_conv_uint_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		   size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                    void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5580,7 +5579,7 @@ done:
  */
 herr_t
 H5T_conv_uint_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5612,7 +5611,7 @@ done:
  */
 herr_t
 H5T_conv_int_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		   size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                    void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5644,7 +5643,7 @@ done:
  */
 herr_t
 H5T_conv_int_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5676,7 +5675,7 @@ done:
  */
 herr_t
 H5T_conv_uint_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5708,7 +5707,7 @@ done:
  */
 herr_t
 H5T_conv_uint_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -5741,7 +5740,7 @@ done:
  */
 herr_t
 H5T_conv_long_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5773,7 +5772,7 @@ done:
  */
 herr_t
 H5T_conv_long_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5805,7 +5804,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -5838,7 +5837,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -5871,7 +5870,7 @@ done:
  */
 herr_t
 H5T_conv_long_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5903,7 +5902,7 @@ done:
  */
 herr_t
 H5T_conv_long_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -5936,7 +5935,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                      void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -5968,7 +5967,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6001,7 +6000,7 @@ done:
  */
 herr_t
 H5T_conv_long_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		  hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		  size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                   void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6033,7 +6032,7 @@ done:
  */
 herr_t
 H5T_conv_long_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		   size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                    void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6065,7 +6064,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		   size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                    void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6097,7 +6096,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6129,7 +6128,7 @@ done:
  */
 herr_t
 H5T_conv_long_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6161,7 +6160,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6193,7 +6192,7 @@ done:
  */
 herr_t
 H5T_conv_long_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6225,7 +6224,7 @@ done:
  */
 herr_t
 H5T_conv_long_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -6258,7 +6257,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -6291,7 +6290,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6324,7 +6323,7 @@ done:
  */
 herr_t
 H5T_conv_llong_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -6357,7 +6356,7 @@ done:
  */
 herr_t
 H5T_conv_llong_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -6390,7 +6389,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6423,7 +6422,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-                      hsize_t nelmts, size_t buf_stride,
+                      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6456,7 +6455,7 @@ done:
  */
 herr_t
 H5T_conv_llong_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -6489,7 +6488,7 @@ done:
  */
 herr_t
 H5T_conv_llong_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6522,7 +6521,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6555,7 +6554,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -6588,7 +6587,7 @@ done:
  */
 herr_t
 H5T_conv_llong_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		   hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		   size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                    void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6620,7 +6619,7 @@ done:
  */
 herr_t
 H5T_conv_llong_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6652,7 +6651,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_int(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6684,7 +6683,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_uint(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -6717,7 +6716,7 @@ done:
  */
 herr_t
 H5T_conv_llong_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		    hsize_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
+		    size_t nelmts, size_t buf_stride, size_t UNUSED bkg_stride,
                     void *buf, void UNUSED *bkg, hid_t UNUSED dxpl_id)
 {
     herr_t      ret_value=SUCCEED;       /* Return value */
@@ -6749,7 +6748,7 @@ done:
  */
 herr_t
 H5T_conv_llong_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -6782,7 +6781,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_long(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		     hsize_t nelmts, size_t buf_stride,
+		     size_t nelmts, size_t buf_stride,
                      size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
 		     hid_t UNUSED dxpl_id)
 {
@@ -6815,7 +6814,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_ulong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6848,7 +6847,7 @@ done:
  */
 herr_t
 H5T_conv_llong_ullong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6881,7 +6880,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_llong(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
@@ -6917,7 +6916,7 @@ done:
  */
 herr_t
 H5T_conv_float_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -6956,7 +6955,7 @@ done:
  */
 herr_t
 H5T_conv_double_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -6988,7 +6987,7 @@ done:
  */
 herr_t
 H5T_conv_char_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7020,7 +7019,7 @@ done:
  */
 herr_t
 H5T_conv_char_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7052,7 +7051,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7084,7 +7083,7 @@ done:
  */
 herr_t
 H5T_conv_uchar_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7116,7 +7115,7 @@ done:
  */
 herr_t
 H5T_conv_short_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7148,7 +7147,7 @@ done:
  */
 herr_t
 H5T_conv_short_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7180,7 +7179,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7212,7 +7211,7 @@ done:
  */
 herr_t
 H5T_conv_ushort_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7244,7 +7243,7 @@ done:
  */
 herr_t
 H5T_conv_int_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7276,7 +7275,7 @@ done:
  */
 herr_t
 H5T_conv_int_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7308,7 +7307,7 @@ done:
  */
 herr_t
 H5T_conv_uint_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7340,7 +7339,7 @@ done:
  */
 herr_t
 H5T_conv_uint_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7372,7 +7371,7 @@ done:
  */
 herr_t
 H5T_conv_long_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7404,7 +7403,7 @@ done:
  */
 herr_t
 H5T_conv_long_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7436,7 +7435,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7468,7 +7467,7 @@ done:
  */
 herr_t
 H5T_conv_ulong_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7501,7 +7500,7 @@ done:
  */
 herr_t
 H5T_conv_llong_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7533,7 +7532,7 @@ done:
  */
 herr_t
 H5T_conv_llong_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7566,7 +7565,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_float (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7598,7 +7597,7 @@ done:
  */
 herr_t
 H5T_conv_ullong_double (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7631,7 +7630,7 @@ done:
  */
 herr_t
 H5T_conv_float_char (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7663,7 +7662,7 @@ done:
  */
 herr_t
 H5T_conv_float_uchar (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7695,7 +7694,7 @@ done:
  */
 herr_t
 H5T_conv_double_char (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7727,7 +7726,7 @@ done:
  */
 herr_t
 H5T_conv_double_uchar (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7759,7 +7758,7 @@ done:
  */
 herr_t
 H5T_conv_float_short (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7791,7 +7790,7 @@ done:
  */
 herr_t
 H5T_conv_float_ushort (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7823,7 +7822,7 @@ done:
  */
 herr_t
 H5T_conv_double_short (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7855,7 +7854,7 @@ done:
  */
 herr_t
 H5T_conv_double_ushort (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7887,7 +7886,7 @@ done:
  */
 herr_t
 H5T_conv_float_int (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7919,7 +7918,7 @@ done:
  */
 herr_t
 H5T_conv_float_uint (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7951,7 +7950,7 @@ done:
  */
 herr_t
 H5T_conv_double_int (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -7983,7 +7982,7 @@ done:
  */
 herr_t
 H5T_conv_double_uint (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -8015,7 +8014,7 @@ done:
  */
 herr_t
 H5T_conv_float_long (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -8047,7 +8046,7 @@ done:
  */
 herr_t
 H5T_conv_float_ulong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -8079,7 +8078,7 @@ done:
  */
 herr_t
 H5T_conv_double_long (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -8111,7 +8110,7 @@ done:
  */
 herr_t
 H5T_conv_double_ulong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -8143,7 +8142,7 @@ done:
  */
 herr_t
 H5T_conv_float_llong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -8175,7 +8174,7 @@ done:
  */
 herr_t
 H5T_conv_float_ullong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -8207,7 +8206,7 @@ done:
  */
 herr_t
 H5T_conv_double_llong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t UNUSED dxpl_id)
 {
@@ -8239,7 +8238,7 @@ done:
  */
 herr_t
 H5T_conv_double_ullong (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		       hsize_t nelmts, size_t buf_stride,
+		       size_t nelmts, size_t buf_stride,
                        size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                        hid_t dxpl_id)
 {
@@ -8276,14 +8275,14 @@ done:
  */
 herr_t
 H5T_conv_i32le_f64le (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-		      hsize_t nelmts, size_t buf_stride,
+		      size_t nelmts, size_t buf_stride,
                       size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
                       hid_t UNUSED dxpl_id)
 {
     uint8_t	*s=NULL, *d=NULL;	/*src and dst buf pointers	*/
     uint8_t	tmp[8];			/*temporary destination buffer	*/
     H5T_t	*src = NULL;		/*source data type		*/
-    hsize_t	elmtno;			/*element counter		*/
+    size_t	elmtno;			/*element counter		*/
     unsigned	sign;			/*sign bit			*/
     unsigned	cin, cout;		/*carry in/out			*/
     unsigned	mbits=0;		/*mantissa bits			*/
@@ -8667,7 +8666,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_f_i (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_f_i (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
     size_t buf_stride, size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
     hid_t dxpl_id)
 {
@@ -8677,10 +8676,10 @@ H5T_conv_f_i (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     H5T_atomic_t src;			/*atomic source info		*/
     H5T_atomic_t dst;			/*atomic destination info	*/
     int	direction;		        /*forward or backward traversal	*/
-    hsize_t	elmtno;			/*element number		*/
+    size_t	elmtno;			/*element number		*/
     size_t	half_size;		/*half the type size		*/
     ssize_t	bitno;			/*bit number			*/
-    hsize_t	olap;			/*num overlapping elements	*/
+    size_t	olap;			/*num overlapping elements	*/
     uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
     uint8_t     *src_rev;               /*order-reversed source buffer  */
     uint8_t	dbuf[64];		/*temp destination buffer	*/
@@ -9134,7 +9133,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5T_conv_i_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
+H5T_conv_i_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, size_t nelmts,
     size_t buf_stride, size_t UNUSED bkg_stride, void *buf, void UNUSED *bkg,
     hid_t dxpl_id)
 {
@@ -9144,9 +9143,9 @@ H5T_conv_i_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     H5T_atomic_t src;			/*atomic source info		*/
     H5T_atomic_t dst;			/*atomic destination info	*/
     int	direction;		/*forward or backward traversal	*/
-    hsize_t	elmtno;			/*element number		*/
+    size_t	elmtno;			/*element number		*/
     size_t	half_size;		/*half the type size		*/
-    hsize_t	olap;			/*num overlapping elements	*/
+    size_t	olap;			/*num overlapping elements	*/
     uint8_t	*s, *sp, *d, *dp;	/*source and dest traversal ptrs*/
     uint8_t     *src_rev;               /*order-reversed source buffer  */
     uint8_t	dbuf[64];		/*temp destination buffer	*/
@@ -9154,9 +9153,9 @@ H5T_conv_i_f (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata, hsize_t nelmts,
     /* Conversion-related variables */
     hsize_t	expo;			/*destiny exponent		*/
     hsize_t	expo_max;		/*maximal possible exponent value       */
-    hsize_t     sign = 0;               /*source sign bit value         */
-    hsize_t     is_max_neg = 0;         /*source is maximal negative value*/
-    hsize_t     do_round = 0;           /*whether there is roundup      */
+    size_t      sign;                   /*source sign bit value         */
+    hbool_t     is_max_neg;             /*source is maximal negative value*/
+    hbool_t     do_round;               /*whether there is roundup      */
     uint8_t     *int_buf;               /*buffer for temporary value    */ 
     size_t      buf_size;               /*buffer size for temporary value */
     size_t	i;			/*miscellaneous counters	*/
diff --git a/src/H5Tnative.c b/src/H5Tnative.c
index 1f4e686..20a2d40 100644
--- a/src/H5Tnative.c
+++ b/src/H5Tnative.c
@@ -370,7 +370,7 @@ H5T_get_native_type(H5T_t *dtype, H5T_direction_t direction, size_t *struct_alig
                         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot get member value")
                     HDmemcpy(memb_value, tmp_memb_value, H5T_get_size(super_type));
                     
-                    if(H5Tconvert(super_type_id, nat_super_type_id, (hsize_t)1, memb_value, NULL, H5P_DEFAULT)<0)
+                    if(H5Tconvert(super_type_id, nat_super_type_id, 1, memb_value, NULL, H5P_DEFAULT)<0)
                         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "cannot get member value")
                                         
                     if(H5T_enum_insert(new_type, memb_name, memb_value)<0)
diff --git a/src/H5Tpkg.h b/src/H5Tpkg.h
index 68789bb..6a80751 100644
--- a/src/H5Tpkg.h
+++ b/src/H5Tpkg.h
@@ -143,11 +143,11 @@ typedef struct H5T_enum_t {
 } H5T_enum_t;
 
 /* VL function pointers */
-typedef hssize_t (*H5T_vlen_getlenfunc_t)(void *vl_addr);
+typedef ssize_t (*H5T_vlen_getlenfunc_t)(void *vl_addr);
 typedef void * (*H5T_vlen_getptrfunc_t)(void *vl_addr);
 typedef htri_t (*H5T_vlen_isnullfunc_t)(H5F_t *f, void *vl_addr);
 typedef herr_t (*H5T_vlen_readfunc_t)(H5F_t *f, hid_t dxpl_id, void *_vl, void *buf, size_t len);
-typedef herr_t (*H5T_vlen_writefunc_t)(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *buf, void *_bg, hsize_t seq_len, hsize_t base_size);
+typedef herr_t (*H5T_vlen_writefunc_t)(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *buf, void *_bg, size_t seq_len, size_t base_size);
 typedef herr_t (*H5T_vlen_setnullfunc_t)(H5F_t *f, hid_t dxpl_id, void *_vl, void *_bg);
 
 /* VL types */
@@ -336,734 +336,726 @@ H5_DLL herr_t H5T_set_size(H5T_t *dt, size_t size);
 
 /* Conversion functions */
 H5_DLL herr_t H5T_conv_noop(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			     hsize_t nelmts, size_t buf_stride,
-                             size_t bkg_stride, void *buf, void *bkg,
-                             hid_t dset_xfer_plist);
+			    size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
 
 H5_DLL herr_t H5T_conv_order(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			      hsize_t nelmts, size_t buf_stride,
-                              size_t bkg_stride, void *_buf, void *bkg,
-                              hid_t dset_xfer_plist);
-H5_DLL herr_t H5T_conv_order_opt(hid_t src_id, hid_t dst_id,
-                                  H5T_cdata_t *cdata, hsize_t nelmts,
-                                  size_t buf_stride, size_t bkg_stride,
-                                  void *_buf, void *bkg,
-                                  hid_t dset_xfer_plist);
+			    size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *_buf, void *bkg,
+                            hid_t dset_xfer_plist);
+H5_DLL herr_t H5T_conv_order_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
+                            size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *_buf, void *bkg,
+                            hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_struct(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			       hsize_t nelmts, size_t buf_stride,
-                               size_t bkg_stride, void *_buf, void *bkg,
-                               hid_t dset_xfer_plist);
-H5_DLL herr_t H5T_conv_struct_opt(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
-				   size_t buf_stride, size_t bkg_stride,
-                                   void *_buf, void *bkg,
-                                   hid_t dset_xfer_plist);
+			    size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *_buf, void *bkg,
+                            hid_t dset_xfer_plist);
+H5_DLL herr_t H5T_conv_struct_opt(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
+                            size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *_buf, void *bkg,
+                            hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_enum(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			     hsize_t nelmts, size_t buf_stride,
-                             size_t bkg_stride, void *buf, void *bkg,
-                             hid_t dset_xfer_plist);
+			    size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_vlen(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			     hsize_t nelmts, size_t buf_stride,
-                             size_t bkg_stride, void *buf, void *bkg,
-                             hid_t dset_xfer_plist);
+			    size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_array(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			     hsize_t nelmts, size_t buf_stride,
-                             size_t bkg_stride, void *buf, void *bkg,
-                             hid_t dset_xfer_plist);
+			    size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_i_i(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			    hsize_t nelmts, size_t buf_stride,
+                            size_t nelmts, size_t buf_stride,
                             size_t bkg_stride, void *_buf, void *bkg,
                             hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_f_f(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			    hsize_t nelmts, size_t buf_stride,
+			    size_t nelmts, size_t buf_stride,
                             size_t bkg_stride, void *_buf, void *bkg,
                             hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_f_i(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			    hsize_t nelmts, size_t buf_stride,
+			    size_t nelmts, size_t buf_stride,
                             size_t bkg_stride, void *_buf, void *bkg,
                             hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_i_f(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			    hsize_t nelmts, size_t buf_stride,
+			    size_t nelmts, size_t buf_stride,
                             size_t bkg_stride, void *_buf, void *bkg,
                             hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_s_s(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			    hsize_t nelmts, size_t buf_stride,
+			    size_t nelmts, size_t buf_stride,
                             size_t bkg_stride, void *_buf, void *bkg,
                             hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_b_b(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-			    hsize_t nelmts, size_t buf_stride,
+			    size_t nelmts, size_t buf_stride,
                             size_t bkg_stride, void *_buf, void *bkg,
                             hid_t dset_xfer_plist);
 
-H5_DLL herr_t H5T_conv_schar_uchar(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
-				    size_t buf_stride, size_t bkg_stride,
-                                    void *buf, void *bkg,
-                                    hid_t dset_xfer_plist);
-H5_DLL herr_t H5T_conv_uchar_schar(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
-				    size_t buf_stride, size_t bkg_stride,
-                                    void *buf, void *bkg,
-                                    hid_t dset_xfer_plist);
-H5_DLL herr_t H5T_conv_schar_short(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
-				    size_t buf_stride, size_t bkg_stride,
-                                    void *buf, void *bkg,
-                                    hid_t dset_xfer_plist);
-H5_DLL herr_t H5T_conv_schar_ushort(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
-				     size_t buf_stride, size_t bkg_stride,
-                                     void *buf, void *bkg,
-                                     hid_t dset_xfer_plist);
-H5_DLL herr_t H5T_conv_uchar_short(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
-				    size_t buf_stride, size_t bkg_stride,
-                                    void *buf, void *bkg,
-                                    hid_t dset_xfer_plist);
-H5_DLL herr_t H5T_conv_uchar_ushort(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
-				     size_t buf_stride, size_t bkg_stride,
-                                     void *buf, void *bkg,
-                                     hid_t dset_xfer_plist);
+H5_DLL herr_t H5T_conv_schar_uchar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
+                            size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
+H5_DLL herr_t H5T_conv_uchar_schar(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
+                            size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
+H5_DLL herr_t H5T_conv_schar_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
+                            size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
+H5_DLL herr_t H5T_conv_schar_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
+                            size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
+H5_DLL herr_t H5T_conv_uchar_short(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
+                            size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
+H5_DLL herr_t H5T_conv_uchar_ushort(hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
+                            size_t nelmts, size_t buf_stride,
+                            size_t bkg_stride, void *buf, void *bkg,
+                            hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_schar_int(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_schar_uint(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uchar_int(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uchar_uint(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_schar_long(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_schar_ulong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uchar_long(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uchar_ulong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_schar_llong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_schar_ullong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uchar_llong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uchar_ullong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 
 H5_DLL herr_t H5T_conv_short_schar(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_uchar(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_schar(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_uchar(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_ushort(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_short(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_int(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_uint(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_int(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_uint(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_long(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_ulong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_long(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_ulong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_llong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_ullong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_llong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_ullong(hid_t src_id, hid_t dst_id,
-				      H5T_cdata_t *cdata, hsize_t nelmts,
+				      H5T_cdata_t *cdata, size_t nelmts,
 				      size_t buf_stride, size_t bkg_stride,
                                       void *buf, void *bkg,
                                       hid_t dset_xfer_plist);
 
 H5_DLL herr_t H5T_conv_int_schar(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_uchar(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_schar(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_uchar(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_short(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_ushort(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_short(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_ushort(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_uint(hid_t src_id, hid_t dst_id,
-				 H5T_cdata_t *cdata, hsize_t nelmts,
+				 H5T_cdata_t *cdata, size_t nelmts,
 				 size_t buf_stride, size_t bkg_stride,
                                  void *buf, void *bkg,
                                  hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_int(hid_t src_id, hid_t dst_id,
-				 H5T_cdata_t *cdata, hsize_t nelmts,
+				 H5T_cdata_t *cdata, size_t nelmts,
 				 size_t buf_stride, size_t bkg_stride,
                                  void *buf, void *bkg,
                                  hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_long(hid_t src_id, hid_t dst_id,
-				 H5T_cdata_t *cdata, hsize_t nelmts,
+				 H5T_cdata_t *cdata, size_t nelmts,
 				 size_t buf_stride, size_t bkg_stride,
                                  void *buf, void *bkg,
                                  hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_ulong(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_long(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_ulong(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_llong(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_ullong(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_llong(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_ullong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 
 H5_DLL herr_t H5T_conv_long_schar(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_uchar(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_schar(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_uchar(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_short(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_ushort(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_short(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_ushort(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_int(hid_t src_id, hid_t dst_id,
-				 H5T_cdata_t *cdata, hsize_t nelmts,
+				 H5T_cdata_t *cdata, size_t nelmts,
 				 size_t buf_stride, size_t bkg_stride,
                                  void *buf, void *bkg,
                                  hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_uint(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_int(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_uint(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_ulong(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_long(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_llong(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_ullong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_llong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_ullong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 
 H5_DLL herr_t H5T_conv_llong_schar(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_uchar(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_schar(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_uchar(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_short(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_ushort(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_short(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_ushort(hid_t src_id, hid_t dst_id,
-				      H5T_cdata_t *cdata, hsize_t nelmts,
+				      H5T_cdata_t *cdata, size_t nelmts,
 				      size_t buf_stride, size_t bkg_stride,
                                       void *buf, void *bkg,
                                       hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_int(hid_t src_id, hid_t dst_id,
-				  H5T_cdata_t *cdata, hsize_t nelmts,
+				  H5T_cdata_t *cdata, size_t nelmts,
 				  size_t buf_stride, size_t bkg_stride,
                                   void *buf, void *bkg,
                                   hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_uint(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_int(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_uint(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_long(hid_t src_id, hid_t dst_id,
-				   H5T_cdata_t *cdata, hsize_t nelmts,
+				   H5T_cdata_t *cdata, size_t nelmts,
 				   size_t buf_stride, size_t bkg_stride,
                                    void *buf, void *bkg,
                                    hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_ulong(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_long(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *buf, void *bkg,
                                     hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_ulong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_ullong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_llong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 
 H5_DLL herr_t H5T_conv_float_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_char_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_char_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uchar_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uchar_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_short_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ushort_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_int_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_uint_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_long_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ulong_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_llong_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 #ifdef H5_ULLONG_TO_FP_CAST_WORKS
 H5_DLL herr_t H5T_conv_ullong_float(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_ullong_double(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 #endif /* H5_ULLONG_TO_FP_CAST_WORKS */
 H5_DLL herr_t H5T_conv_float_char(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_uchar(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_short(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_ushort(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_int(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_uint(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_long(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_ulong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_llong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_float_ullong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_char(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_uchar(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_short(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_ushort(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_int(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_uint(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_long(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_ulong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_llong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_double_ullong(hid_t src_id, hid_t dst_id,
-				     H5T_cdata_t *cdata, hsize_t nelmts,
+				     H5T_cdata_t *cdata, size_t nelmts,
 				     size_t buf_stride, size_t bkg_stride,
                                      void *buf, void *bkg,
                                      hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_conv_i32le_f64le(hid_t src_id, hid_t dst_id,
-				    H5T_cdata_t *cdata, hsize_t nelmts,
+				    H5T_cdata_t *cdata, size_t nelmts,
 				    size_t buf_stride, size_t bkg_stride,
                                     void *_buf, void *bkg,
                                     hid_t dset_xfer_plist);
diff --git a/src/H5Tprivate.h b/src/H5Tprivate.h
index 5c76e82..31fa493 100644
--- a/src/H5Tprivate.h
+++ b/src/H5Tprivate.h
@@ -84,7 +84,7 @@ H5_DLL H5T_path_t *H5T_path_find(const H5T_t *src, const H5T_t *dst,
 H5_DLL hbool_t H5T_path_noop(const H5T_path_t *p);
 H5_DLL H5T_bkg_t H5T_path_bkg(const H5T_path_t *p);
 H5_DLL herr_t H5T_convert(H5T_path_t *tpath, hid_t src_id, hid_t dst_id,
-			   hsize_t nelmts, size_t buf_stride, size_t bkg_stride,
+			   size_t nelmts, size_t buf_stride, size_t bkg_stride,
                            void *buf, void *bkg, hid_t dset_xfer_plist);
 H5_DLL herr_t H5T_vlen_reclaim(void *elem, hid_t type_id, hsize_t ndim, hssize_t *point, void *_op_data);
 H5_DLL herr_t H5T_vlen_get_alloc_info(hid_t dxpl_id, H5T_vlen_alloc_info_t *vl_alloc_info);
diff --git a/src/H5Tpublic.h b/src/H5Tpublic.h
index 403419f..3fec470 100644
--- a/src/H5Tpublic.h
+++ b/src/H5Tpublic.h
@@ -198,7 +198,7 @@ extern "C" {
 
 /* All datatype conversion functions are... */
 typedef herr_t (*H5T_conv_t) (hid_t src_id, hid_t dst_id, H5T_cdata_t *cdata,
-      hsize_t nelmts, size_t buf_stride, size_t bkg_stride, void *buf,
+      size_t nelmts, size_t buf_stride, size_t bkg_stride, void *buf,
       void *bkg, hid_t dset_xfer_plist);
 
 /* Exception handler.  If an exception like overflow happenes during conversion,
@@ -573,7 +573,7 @@ H5_DLL herr_t H5Tregister(H5T_pers_t pers, const char *name, hid_t src_id,
 H5_DLL herr_t H5Tunregister(H5T_pers_t pers, const char *name, hid_t src_id,
 			     hid_t dst_id, H5T_conv_t func);
 H5_DLL H5T_conv_t H5Tfind(hid_t src_id, hid_t dst_id, H5T_cdata_t **pcdata);
-H5_DLL herr_t H5Tconvert(hid_t src_id, hid_t dst_id, hsize_t nelmts,
+H5_DLL herr_t H5Tconvert(hid_t src_id, hid_t dst_id, size_t nelmts,
 			  void *buf, void *background, hid_t plist_id);
 
 #ifdef __cplusplus
diff --git a/src/H5Tvlen.c b/src/H5Tvlen.c
index b5b8ba9..628c1e3 100644
--- a/src/H5Tvlen.c
+++ b/src/H5Tvlen.c
@@ -40,23 +40,23 @@ static herr_t H5T_init_vlen_interface(void);
 
 /* Local functions */
 static herr_t H5T_vlen_reclaim_recurse(void *elem, const H5T_t *dt, H5MM_free_t free_func, void *free_info);
-static hssize_t H5T_vlen_seq_mem_getlen(void *_vl);
+static ssize_t H5T_vlen_seq_mem_getlen(void *_vl);
 static void * H5T_vlen_seq_mem_getptr(void *_vl);
 static htri_t H5T_vlen_seq_mem_isnull(H5F_t *f, void *_vl);
 static herr_t H5T_vlen_seq_mem_read(H5F_t *f, hid_t dxpl_id, void *_vl, void *_buf, size_t len);
-static herr_t H5T_vlen_seq_mem_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *_buf, void *_bg, hsize_t seq_len, hsize_t base_size);
+static herr_t H5T_vlen_seq_mem_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *_buf, void *_bg, size_t seq_len, size_t base_size);
 static herr_t H5T_vlen_seq_mem_setnull(H5F_t *f, hid_t dxpl_id, void *_vl, void *_bg);
-static hssize_t H5T_vlen_str_mem_getlen(void *_vl);
+static ssize_t H5T_vlen_str_mem_getlen(void *_vl);
 static void * H5T_vlen_str_mem_getptr(void *_vl);
 static htri_t H5T_vlen_str_mem_isnull(H5F_t *f, void *_vl);
 static herr_t H5T_vlen_str_mem_read(H5F_t *f, hid_t dxpl_id, void *_vl, void *_buf, size_t len);
-static herr_t H5T_vlen_str_mem_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *_buf, void *_bg, hsize_t seq_len, hsize_t base_size);
+static herr_t H5T_vlen_str_mem_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *_buf, void *_bg, size_t seq_len, size_t base_size);
 static herr_t H5T_vlen_str_mem_setnull(H5F_t *f, hid_t dxpl_id, void *_vl, void *_bg);
-static hssize_t H5T_vlen_disk_getlen(void *_vl);
+static ssize_t H5T_vlen_disk_getlen(void *_vl);
 static void * H5T_vlen_disk_getptr(void *_vl);
 static htri_t H5T_vlen_disk_isnull(H5F_t *f, void *_vl);
 static herr_t H5T_vlen_disk_read(H5F_t *f, hid_t dxpl_id, void *_vl, void *_buf, size_t len);
-static herr_t H5T_vlen_disk_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *_buf, void *_bg, hsize_t seq_len, hsize_t base_size);
+static herr_t H5T_vlen_disk_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *_buf, void *_bg, size_t seq_len, size_t base_size);
 static herr_t H5T_vlen_disk_setnull(H5F_t *f, hid_t dxpl_id, void *_vl, void *_bg);
 
 /* Local variables */
@@ -316,7 +316,7 @@ done:
  *
  *-------------------------------------------------------------------------
  */
-static hssize_t
+static ssize_t
 H5T_vlen_seq_mem_getlen(void *_vl)
 {
     hvl_t *vl=(hvl_t *)_vl;   /* Pointer to the user's hvl_t information */
@@ -326,7 +326,7 @@ H5T_vlen_seq_mem_getlen(void *_vl)
     /* check parameters */
     assert(vl);
 
-    FUNC_LEAVE_NOAPI((hssize_t)vl->len)
+    FUNC_LEAVE_NOAPI((ssize_t)vl->len)
 }   /* end H5T_vlen_seq_mem_getlen() */
 
 
@@ -435,7 +435,7 @@ H5T_vlen_seq_mem_read(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, void *_vl, void *bu
  */
 /* ARGSUSED */
 static herr_t
-H5T_vlen_seq_mem_write(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *buf, void UNUSED *_bg, hsize_t seq_len, hsize_t base_size)
+H5T_vlen_seq_mem_write(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *buf, void UNUSED *_bg, size_t seq_len, size_t base_size)
 {
     hvl_t vl;                       /* Temporary hvl_t to use during operation */
     size_t len;
@@ -448,7 +448,7 @@ H5T_vlen_seq_mem_write(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const H5T_vlen_all
     assert(buf);
 
     if(seq_len!=0) {
-        H5_ASSIGN_OVERFLOW(len,(seq_len*base_size),hsize_t,size_t);
+        len=seq_len*base_size;
 
         /* Use the user's memory allocation routine is one is defined */
         if(vl_alloc_info->alloc_func!=NULL) {
@@ -468,7 +468,7 @@ H5T_vlen_seq_mem_write(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const H5T_vlen_all
         vl.p=NULL;
 
     /* Set the sequence length */
-    H5_ASSIGN_OVERFLOW(vl.len,seq_len,hsize_t,size_t);
+    vl.len=seq_len;
 
     /* Set pointer in user's buffer with memcpy, to avoid alignment issues */
     HDmemcpy(_vl,&vl,sizeof(hvl_t));
@@ -528,7 +528,7 @@ H5T_vlen_seq_mem_setnull(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, void *_vl, void
  *
  *-------------------------------------------------------------------------
  */
-static hssize_t
+static ssize_t
 H5T_vlen_str_mem_getlen(void *_vl)
 {
     char *s=*(char **)_vl;   /* Pointer to the user's string information */
@@ -538,7 +538,7 @@ H5T_vlen_str_mem_getlen(void *_vl)
     /* check parameters */
     assert(s);
 
-    FUNC_LEAVE_NOAPI((hssize_t)HDstrlen(s))
+    FUNC_LEAVE_NOAPI((ssize_t)HDstrlen(s))
 }   /* end H5T_vlen_str_mem_getlen() */
 
 
@@ -646,7 +646,7 @@ H5T_vlen_str_mem_read(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, void *_vl, void *bu
  */
 /* ARGSUSED */
 static herr_t
-H5T_vlen_str_mem_write(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *buf, void UNUSED *_bg, hsize_t seq_len, hsize_t base_size)
+H5T_vlen_str_mem_write(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const H5T_vlen_alloc_info_t *vl_alloc_info, void *_vl, void *buf, void UNUSED *_bg, size_t seq_len, size_t base_size)
 {
     char *t;                        /* Pointer to temporary buffer allocated */
     size_t len;                     /* Maximum length of the string to copy */
@@ -656,19 +656,18 @@ H5T_vlen_str_mem_write(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const H5T_vlen_all
 
     /* check parameters */
     assert(buf);
-    H5_CHECK_OVERFLOW(((seq_len+1)*base_size),hsize_t,size_t);
 
     /* Use the user's memory allocation routine if one is defined */
     if(vl_alloc_info->alloc_func!=NULL) {
-        if(NULL==(t=(vl_alloc_info->alloc_func)((size_t)((seq_len+1)*base_size),vl_alloc_info->alloc_info)))
+        if(NULL==(t=(vl_alloc_info->alloc_func)((seq_len+1)*base_size,vl_alloc_info->alloc_info)))
             HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for VL data")
       } /* end if */
     else {  /* Default to system malloc */
-        if(NULL==(t=H5MM_malloc((size_t)((seq_len+1)*base_size))))
+        if(NULL==(t=H5MM_malloc((seq_len+1)*base_size)))
             HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for VL data")
       } /* end else */
 
-    H5_ASSIGN_OVERFLOW(len,(seq_len*base_size),hsize_t,size_t);
+    len=(seq_len*base_size);
     HDmemcpy(t,buf,len);
     t[len]='\0';
 
@@ -723,11 +722,11 @@ H5T_vlen_str_mem_setnull(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, void *_vl, void
  *
  *-------------------------------------------------------------------------
  */
-static hssize_t
+static ssize_t
 H5T_vlen_disk_getlen(void *_vl)
 {
     uint8_t *vl=(uint8_t *)_vl; /* Pointer to the disk VL information */
-    hssize_t	seq_len;        /* Sequence length */
+    size_t	seq_len;        /* Sequence length */
 
     FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5T_vlen_disk_getlen)
 
@@ -736,7 +735,7 @@ H5T_vlen_disk_getlen(void *_vl)
 
     UINT32DECODE(vl, seq_len);
 
-    FUNC_LEAVE_NOAPI(seq_len)
+    FUNC_LEAVE_NOAPI((ssize_t)seq_len)
 }   /* end H5T_vlen_disk_getlen() */
 
 
@@ -871,7 +870,7 @@ done:
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5T_vlen_disk_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t UNUSED *vl_alloc_info, void *_vl, void *buf, void *_bg, hsize_t seq_len, hsize_t base_size)
+H5T_vlen_disk_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t UNUSED *vl_alloc_info, void *_vl, void *buf, void *_bg, size_t seq_len, size_t base_size)
 {
     uint8_t *vl=(uint8_t *)_vl; /*Pointer to the user's hvl_t information*/
     uint8_t *bg=(uint8_t *)_bg; /*Pointer to the old data hvl_t          */
@@ -888,7 +887,7 @@ H5T_vlen_disk_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t UNUSED
     
     /* Free heap object for old data.  */
     if(bg!=NULL) {
-        hsize_t bg_seq_len=0;   /* "Background" VL info sequence's length */
+        size_t bg_seq_len;      /* "Background" VL info sequence's length */
         H5HG_t bg_hobjid;       /* "Background" VL info sequence's ID info */
 
         /* Get the length of the sequence and heap object ID from background data. */
@@ -907,11 +906,10 @@ H5T_vlen_disk_write(H5F_t *f, hid_t dxpl_id, const H5T_vlen_alloc_info_t UNUSED
     } /* end if */
 
     /* Set the length of the sequence */
-    H5_CHECK_OVERFLOW(seq_len,hsize_t,size_t);
     UINT32ENCODE(vl, seq_len);
     
     /* Write the VL information to disk (allocates space also) */
-    H5_ASSIGN_OVERFLOW(len,(seq_len*base_size),hsize_t,size_t);
+    len=(seq_len*base_size);
     if(H5HG_insert(f,dxpl_id,len,buf,&hobjid)<0)
         HGOTO_ERROR(H5E_DATATYPE, H5E_WRITEERROR, FAIL, "Unable to write VL information")
 
diff --git a/src/H5Zprivate.h b/src/H5Zprivate.h
index 0c43bf7..4e26f31 100644
--- a/src/H5Zprivate.h
+++ b/src/H5Zprivate.h
@@ -70,7 +70,7 @@ typedef struct H5Z_data_xform_t H5Z_data_xform_t; /* Defined in H5Ztrans.c */
 H5_DLL H5Z_data_xform_t *H5Z_xform_create(const char *expr);
 H5_DLL herr_t H5Z_xform_copy(H5Z_data_xform_t **data_xform_prop);
 H5_DLL herr_t H5Z_xform_destroy(H5Z_data_xform_t *data_xform_prop);
-H5_DLL herr_t H5Z_xform_eval(const H5Z_data_xform_t *data_xform_prop, void* array, hsize_t array_size, const H5T_t *buf_type);
+H5_DLL herr_t H5Z_xform_eval(const H5Z_data_xform_t *data_xform_prop, void* array, size_t array_size, const H5T_t *buf_type);
 H5_DLL hbool_t H5Z_xform_noop(const H5Z_data_xform_t *data_xform_prop);
 
 #endif
diff --git a/src/H5Ztrans.c b/src/H5Ztrans.c
index 705fd3d..b7f242c 100644
--- a/src/H5Ztrans.c
+++ b/src/H5Ztrans.c
@@ -91,7 +91,7 @@ static H5Z_node *H5Z_parse_factor(H5Z_token *current);
 static H5Z_node *H5Z_new_node(H5Z_token_type type);
 static void H5Z_do_op(H5Z_node* tree);
 static hid_t H5Z_xform_find_type(const H5T_t* type);
-static H5Z_result H5Z_eval_full(H5Z_node *tree, void* array, hsize_t array_size, hid_t array_type);
+static H5Z_result H5Z_eval_full(H5Z_node *tree, void* array, size_t array_size, hid_t array_type);
 static void H5Z_xform_destroy_parse_tree(H5Z_node *tree);
 static void* H5Z_xform_parse(const char *expression);
 static void* H5Z_xform_copy_tree(H5Z_node* tree);
@@ -722,7 +722,7 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5Z_eval_full
+ * Function:    H5Z_xform_eval
  * Purpose: 	If the transform is trivial, this function applies it.
  * 		Otherwise, it calls H5Z_xform_eval_full to do the full 
  * 		transform.
@@ -734,11 +734,11 @@ done:
  *-------------------------------------------------------------------------
  */
 
-herr_t H5Z_xform_eval(const H5Z_data_xform_t *data_xform_prop, void* array, hsize_t array_size, const H5T_t *buf_type)
+herr_t H5Z_xform_eval(const H5Z_data_xform_t *data_xform_prop, void* array, size_t array_size, const H5T_t *buf_type)
 {
     H5Z_node *tree;
     hid_t array_type;
-    unsigned int i;
+    size_t i;
     int n;  
     float f;
     H5Z_result res;
@@ -822,11 +822,11 @@ done:
  *-------------------------------------------------------------------------
  */
 static H5Z_result
-H5Z_eval_full(H5Z_node *tree, void* array, hsize_t array_size,  hid_t array_type)
+H5Z_eval_full(H5Z_node *tree, void* array, size_t array_size,  hid_t array_type)
 {
 
     H5Z_result res, resl, resr, ret_value, error;
-    unsigned int i;
+    size_t i;
     
     error.type = H5Z_XFORM_ERROR;
         
diff --git a/test/dtypes.c b/test/dtypes.c
index a01e765..914b432 100644
--- a/test/dtypes.c
+++ b/test/dtypes.c
@@ -191,7 +191,7 @@ overflow_handler(hid_t UNUSED src_id, hid_t UNUSED dst_id,
  *-------------------------------------------------------------------------
  */
 static H5T_conv_ret_t 
-except_func(int except_type, hid_t src_id, hid_t dst_id, void *src_buf,
+except_func(int except_type, hid_t UNUSED src_id, hid_t UNUSED dst_id, void UNUSED *src_buf,
 		 void *dst_buf, void *user_data)
 {
     H5T_conv_ret_t      ret = H5T_CONV_HANDLED;
@@ -640,7 +640,7 @@ test_compound_2(void)
 	int e, d, c[4], b, a;
     } *d_ptr;
 
-    const int		nelmts = NTESTELEM;
+    const size_t	nelmts = NTESTELEM;
     const hsize_t	four = 4;
     unsigned char	*buf=NULL, *orig=NULL, *bkg=NULL;
     hid_t		st=-1, dt=-1;
@@ -653,7 +653,7 @@ test_compound_2(void)
     buf = malloc(nelmts * MAX(sizeof(struct st), sizeof(struct dt)));
     bkg = malloc(nelmts * sizeof(struct dt));
     orig = malloc(nelmts * sizeof(struct st));
-    for (i=0; i<nelmts; i++) {
+    for (i=0; i<(int)nelmts; i++) {
 	s_ptr = ((struct st*)orig) + i;
 	s_ptr->a    = i*8+0;
 	s_ptr->b    = i*8+1;
@@ -688,10 +688,10 @@ test_compound_2(void)
     H5Tclose(array_dt);
     
     /* Perform the conversion */
-    if (H5Tconvert(st, dt, (hsize_t)nelmts, buf, bkg, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(st, dt, nelmts, buf, bkg, H5P_DEFAULT)<0) goto error;
 
     /* Compare results */
-    for (i=0; i<nelmts; i++) {
+    for (i=0; i<(int)nelmts; i++) {
 	s_ptr = ((struct st*)orig) + i;
 	d_ptr = ((struct dt*)buf)  + i;
 	if (s_ptr->a    != d_ptr->a    ||
@@ -757,7 +757,7 @@ test_compound_3(void)
 	int a,    c[4],    e;
     } *d_ptr;
 
-    const int		nelmts = NTESTELEM;
+    const size_t	nelmts = NTESTELEM;
     const hsize_t	four = 4;
     unsigned char	*buf=NULL, *orig=NULL, *bkg=NULL;
     hid_t		st=-1, dt=-1;
@@ -770,7 +770,7 @@ test_compound_3(void)
     buf = malloc(nelmts * MAX(sizeof(struct st), sizeof(struct dt)));
     bkg = malloc(nelmts * sizeof(struct dt));
     orig = malloc(nelmts * sizeof(struct st));
-    for (i=0; i<nelmts; i++) {
+    for (i=0; i<(int)nelmts; i++) {
         s_ptr = ((struct st*)orig) + i;
         s_ptr->a    = i*8+0;
         s_ptr->b    = i*8+1;
@@ -803,11 +803,11 @@ test_compound_3(void)
     H5Tclose(array_dt);
     
     /* Perform the conversion */
-    if (H5Tconvert(st, dt, (hsize_t)nelmts, buf, bkg, H5P_DEFAULT)<0)
+    if (H5Tconvert(st, dt, nelmts, buf, bkg, H5P_DEFAULT)<0)
         goto error;
 
     /* Compare results */
-    for (i=0; i<nelmts; i++) {
+    for (i=0; i<(int)nelmts; i++) {
 	s_ptr = ((struct st*)orig) + i;
 	d_ptr = ((struct dt*)buf)  + i;
 	if (s_ptr->a    != d_ptr->a    ||
@@ -875,7 +875,7 @@ test_compound_4(void)
 	int e;
     } *d_ptr;
 
-    const int		nelmts = NTESTELEM;
+    const size_t	nelmts = NTESTELEM;
     const hsize_t	four = 4;
     unsigned char	*buf=NULL, *orig=NULL, *bkg=NULL;
     hid_t		st=-1, dt=-1;
@@ -888,7 +888,7 @@ test_compound_4(void)
     buf = malloc(nelmts * MAX(sizeof(struct st), sizeof(struct dt)));
     bkg = malloc(nelmts * sizeof(struct dt));
     orig = malloc(nelmts * sizeof(struct st));
-    for (i=0; i<nelmts; i++) {
+    for (i=0; i<(int)nelmts; i++) {
         s_ptr = ((struct st*)orig) + i;
         s_ptr->a    = i*8+0;
         s_ptr->b    = (i*8+1) & 0x7fff;
@@ -923,11 +923,11 @@ test_compound_4(void)
     H5Tclose(array_dt);
     
     /* Perform the conversion */
-    if (H5Tconvert(st, dt, (hsize_t)nelmts, buf, bkg, H5P_DEFAULT)<0)
+    if (H5Tconvert(st, dt, nelmts, buf, bkg, H5P_DEFAULT)<0)
         goto error;
 
     /* Compare results */
-    for (i=0; i<nelmts; i++) {
+    for (i=0; i<(int)nelmts; i++) {
 	s_ptr = ((struct st*)orig) + i;
 	d_ptr = ((struct dt*)buf)  + i;
 	if (s_ptr->a    != d_ptr->a    ||
@@ -1044,7 +1044,7 @@ test_compound_5(void)
 
     /* Convert data */
     HDmemcpy(buf, src, sizeof(src));
-    H5Tconvert(src_type, dst_type, (hsize_t)2, buf, bkg, H5P_DEFAULT);
+    H5Tconvert(src_type, dst_type, 2, buf, bkg, H5P_DEFAULT);
     dst = (dst_type_t*)buf;
 
     /* Cleanup */
@@ -1106,7 +1106,7 @@ test_compound_6(void)
         long d;
     } *d_ptr;
 
-    const int		nelmts = NTESTELEM;
+    const size_t	nelmts = NTESTELEM;
     unsigned char	*buf=NULL, *orig=NULL, *bkg=NULL;
     hid_t		st=-1, dt=-1;
     int			i;
@@ -1117,7 +1117,7 @@ test_compound_6(void)
     buf = malloc(nelmts * MAX(sizeof(struct st), sizeof(struct dt)));
     bkg = malloc(nelmts * sizeof(struct dt));
     orig = malloc(nelmts * sizeof(struct st));
-    for (i=0; i<nelmts; i++) {
+    for (i=0; i<(int)nelmts; i++) {
         s_ptr = ((struct st*)orig) + i;
         s_ptr->b    = (i*8+1) & 0x7fff;
         s_ptr->d    = (i*8+6) & 0x7fff;
@@ -1140,13 +1140,13 @@ test_compound_6(void)
     }
     
     /* Perform the conversion */
-    if (H5Tconvert(st, dt, (hsize_t)nelmts, buf, bkg, H5P_DEFAULT)<0) {
+    if (H5Tconvert(st, dt, nelmts, buf, bkg, H5P_DEFAULT)<0) {
         H5_FAILED();
         goto error;
     }
 
     /* Compare results */
-    for (i=0; i<nelmts; i++) {
+    for (i=0; i<(int)nelmts; i++) {
 	s_ptr = ((struct st*)orig) + i;
 	d_ptr = ((struct dt*)buf)  + i;
 	if (s_ptr->b    != d_ptr->b    ||
@@ -2249,13 +2249,13 @@ test_conv_str_1(void)
     dst_type = mkstr(5, H5T_STR_NULLTERM);
     buf = HDcalloc(2, 10);
     HDmemcpy(buf, "abcdefghi\0abcdefghi\0", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcd\0abcd\0abcdefghi\0", 20)) {
 	H5_FAILED();
 	HDputs("    Truncated C-string test failed");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcd\0\0\0\0\0\0abcd\0\0\0\0\0\0", 20)) {
 	H5_FAILED();
 	HDputs("    Extended C-string test failed");
@@ -2272,13 +2272,13 @@ test_conv_str_1(void)
     dst_type = mkstr(5, H5T_STR_NULLPAD);
     buf = HDcalloc(2, 10);
     HDmemcpy(buf, "abcdefghijabcdefghij", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdeabcdeabcdefghij", 20)) {
 	H5_FAILED();
 	HDputs("    Truncated C buffer test failed");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcde\0\0\0\0\0abcde\0\0\0\0\0", 20)) {
 	H5_FAILED();
 	HDputs("    Extended C buffer test failed");
@@ -2295,13 +2295,13 @@ test_conv_str_1(void)
     dst_type = mkstr(5, H5T_STR_SPACEPAD);
     buf = HDcalloc(2, 10);
     HDmemcpy(buf, "abcdefghijabcdefghij", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdeabcdeabcdefghij", 20)) {
 	H5_FAILED();
 	HDputs("    Truncated Fortran-string test failed");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcde     abcde     ", 20)) {
 	H5_FAILED();
 	HDputs("    Extended Fortran-string test failed");
@@ -2321,7 +2321,7 @@ test_conv_str_1(void)
     dst_type = mkstr(10, H5T_STR_NULLTERM);
     buf = HDcalloc(2, 10);
     HDmemcpy(buf, "abcdefghijabcdefghij", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdefghijabcdefghij", 20)) {
 	H5_FAILED();
 	HDputs("    Non-terminated string test 1");
@@ -2330,14 +2330,14 @@ test_conv_str_1(void)
     H5Tclose(dst_type);
     dst_type = mkstr(5, H5T_STR_NULLTERM);
     HDmemcpy(buf, "abcdefghijabcdefghij", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcd\0abcd\0abcdefghij", 20)) {
 	H5_FAILED();
 	HDputs("    Non-terminated string test 2");
 	goto error;
     }
     HDmemcpy(buf, "abcdeabcdexxxxxxxxxx", 20);
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcde\0\0\0\0\0abcde\0\0\0\0\0", 20)) {
 	H5_FAILED();
 	HDputs("    Non-terminated string test 2");
@@ -2354,13 +2354,13 @@ test_conv_str_1(void)
     dst_type = mkstr(10, H5T_STR_SPACEPAD);
     buf = HDcalloc(2, 10);
     HDmemcpy(buf, "abcdefghi\0abcdefghi\0", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdefghi abcdefghi ", 20)) {
 	H5_FAILED();
 	HDputs("    C string to Fortran test 1");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdefghi\0abcdefghi\0", 20)) {
 	H5_FAILED();
 	HDputs("    Fortran to C string test 1");
@@ -2369,13 +2369,13 @@ test_conv_str_1(void)
     if (H5Tclose(dst_type)<0) goto error;
     dst_type = mkstr(5, H5T_STR_SPACEPAD);
     HDmemcpy(buf, "abcdefgh\0\0abcdefgh\0\0", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdeabcdeabcdefgh\0\0", 20)) {
 	H5_FAILED();
 	HDputs("    C string to Fortran test 2");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcde\0\0\0\0\0abcde\0\0\0\0\0", 20)) {
 	H5_FAILED();
 	HDputs("    Fortran to C string test 2");
@@ -2386,13 +2386,13 @@ test_conv_str_1(void)
     src_type = mkstr(5, H5T_STR_NULLTERM);
     dst_type = mkstr(10, H5T_STR_SPACEPAD);
     HDmemcpy(buf, "abcd\0abcd\0xxxxxxxxxx", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcd      abcd      ", 20)) {
 	H5_FAILED();
 	HDputs("    C string to Fortran test 3");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcd\0abcd\0abcd      ", 20)) {
 	H5_FAILED();
 	HDputs("    Fortran to C string test 3");
@@ -2409,13 +2409,13 @@ test_conv_str_1(void)
     dst_type = mkstr(10, H5T_STR_SPACEPAD);
     buf = HDcalloc(2, 10);
     HDmemcpy(buf, "abcdefghijabcdefghij", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdefghijabcdefghij", 20)) {
 	H5_FAILED();
 	HDputs("    C buffer to Fortran test 1");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdefghijabcdefghij", 20)) {
 	H5_FAILED();
 	HDputs("    Fortran to C buffer test 1");
@@ -2424,13 +2424,13 @@ test_conv_str_1(void)
     if (H5Tclose(dst_type)<0) goto error;
     dst_type = mkstr(5, H5T_STR_SPACEPAD);
     HDmemcpy(buf, "abcdefgh\0\0abcdefgh\0\0", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcdeabcdeabcdefgh\0\0", 20)) {
 	H5_FAILED();
 	HDputs("    C buffer to Fortran test 2");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcde\0\0\0\0\0abcde\0\0\0\0\0", 20)) {
 	H5_FAILED();
 	HDputs("    Fortran to C buffer test 2");
@@ -2441,13 +2441,13 @@ test_conv_str_1(void)
     src_type = mkstr(5, H5T_STR_NULLPAD);
     dst_type = mkstr(10, H5T_STR_SPACEPAD);
     HDmemcpy(buf, "abcd\0abcd\0xxxxxxxxxx", 20);
-    if (H5Tconvert(src_type, dst_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(src_type, dst_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcd      abcd      ", 20)) {
 	H5_FAILED();
 	HDputs("    C buffer to Fortran test 3");
 	goto error;
     }
-    if (H5Tconvert(dst_type, src_type, (hsize_t)2, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(dst_type, src_type, 2, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (HDmemcmp(buf, "abcd\0abcd\0abcd      ", 20)) {
 	H5_FAILED();
 	HDputs("    Fortran to C buffer test 3");
@@ -2516,9 +2516,9 @@ test_conv_str_2(void)
 	}
 	printf("%-70s", s);
 	HDfflush(stdout);
-	if (H5Tconvert(c_type, f_type, (hsize_t)nelmts, buf, NULL, H5P_DEFAULT)<0)
+	if (H5Tconvert(c_type, f_type, nelmts, buf, NULL, H5P_DEFAULT)<0)
             goto error;
-	if (H5Tconvert(f_type, c_type, (hsize_t)nelmts, buf, NULL, H5P_DEFAULT)<0)
+	if (H5Tconvert(f_type, c_type, nelmts, buf, NULL, H5P_DEFAULT)<0)
             goto error;
 	PASSED();
     }
@@ -2550,7 +2550,8 @@ test_conv_str_2(void)
 static int
 test_conv_enum_1(void)
 {
-    const int	nelmts=NTESTELEM, ntests=NTESTS;
+    const size_t nelmts=NTESTELEM;
+    const int	ntests=NTESTS;
     int		i, val, *buf=NULL;
     hid_t	t1, t2;
     char	s[80];
@@ -2568,7 +2569,7 @@ test_conv_enum_1(void)
 
     /* Initialize the buffer */
     buf = HDmalloc(nelmts*MAX(H5Tget_size(t1), H5Tget_size(t2)));
-    for (i=0; i<nelmts; i++)
+    for (i=0; i<(int)nelmts; i++)
         buf[i] = HDrand() % 26;
 
     /* Conversions */
@@ -2581,7 +2582,7 @@ test_conv_enum_1(void)
 	}
 	printf("%-70s", s);
 	HDfflush(stdout);
-	if (H5Tconvert(t1, t2, (hsize_t)nelmts, buf, NULL, H5P_DEFAULT)<0) goto error;
+	if (H5Tconvert(t1, t2, nelmts, buf, NULL, H5P_DEFAULT)<0) goto error;
 	PASSED();
     }
 
@@ -2594,7 +2595,7 @@ test_conv_enum_1(void)
 	}
 	printf("%-70s", s);
 	HDfflush(stdout);
-	if (H5Tconvert(t2, t1, (hsize_t)nelmts, buf, NULL, H5P_DEFAULT)<0) goto error;
+	if (H5Tconvert(t2, t1, nelmts, buf, NULL, H5P_DEFAULT)<0) goto error;
 	PASSED();
     }
     ret_value = 0;
@@ -2664,7 +2665,7 @@ test_conv_enum_2(void)
     }
 
     /* Convert to destination type */
-    H5Tconvert(srctype, dsttype, (hsize_t)NTESTELEM, data, NULL, H5P_DEFAULT);
+    H5Tconvert(srctype, dsttype, NTESTELEM, data, NULL, H5P_DEFAULT);
 
     /* Check results */
     for (i=0; i<NTESTELEM; i++) {
@@ -2728,7 +2729,7 @@ test_conv_bitfield(void)
     dt = H5Tcopy(H5T_STD_B32LE);
     buf[0] = buf[1] = 0xAA;
     buf[2] = buf[3] = 0x55; /*irrelevant*/
-    if (H5Tconvert(st, dt, (hsize_t)1, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(st, dt, 1, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (buf[0]!=0xAA || buf[1]!=0xAA || buf[2]!=0 || buf[3]!=0) {
 	H5_FAILED();
 	printf("    s=0xaaaa, d=0x%02x%02x%02x%02x (test 1)\n",
@@ -2747,7 +2748,7 @@ test_conv_bitfield(void)
     H5Tset_precision(dt, 12);
     H5Tset_offset(dt, 10);
     buf[0] = 0xA8; buf[1] = 0x2A; buf[2] = buf[3] = 0;
-    if (H5Tconvert(st, dt, (hsize_t)1, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(st, dt, 1, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (buf[0]!=0 || buf[1]!=0xA8 || buf[2]!=0x2A || buf[3]!=0) {
 	H5_FAILED();
 	printf("    s=0x2AA8 d=0x%02x%02x%02x%02x (test 2)\n",
@@ -2761,7 +2762,7 @@ test_conv_bitfield(void)
      */
     H5Tset_pad(dt, H5T_PAD_ONE, H5T_PAD_ONE);
     buf[0] = 0xA8; buf[1] = 0x2A; buf[2] = buf[3] = 0;
-    if (H5Tconvert(st, dt, (hsize_t)1, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(st, dt, 1, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (buf[0]!=0xff || buf[1]!=0xAB || buf[2]!=0xEA || buf[3]!=0xff) {
 	H5_FAILED();
 	printf("    s=0x2AA8 d=0x%02x%02x%02x%02x (test 3)\n",
@@ -2801,7 +2802,7 @@ test_conv_bitfield(void)
  */
 static herr_t
 convert_opaque(hid_t UNUSED st, hid_t UNUSED dt, H5T_cdata_t *cdata,
-	       hsize_t UNUSED nelmts, size_t UNUSED buf_stride,
+	       size_t UNUSED nelmts, size_t UNUSED buf_stride,
                size_t UNUSED bkg_stride, void UNUSED *_buf,
 	       void UNUSED *bkg, hid_t UNUSED dset_xfer_plid)
 {
@@ -2892,7 +2893,7 @@ opaque_check(int tag_it)
 
     /* Make sure that we can't convert between the types yet */
     H5E_BEGIN_TRY {
-	status = H5Tconvert(st, dt, (hsize_t)OPAQUE_NELMTS, buf, NULL, H5P_DEFAULT);
+	status = H5Tconvert(st, dt, OPAQUE_NELMTS, buf, NULL, H5P_DEFAULT);
     } H5E_END_TRY;
     if (status>=0) {
 	H5_FAILED();
@@ -2905,7 +2906,7 @@ opaque_check(int tag_it)
 	goto error;
 
     /* Try the conversion again, this time it should work */
-    if (H5Tconvert(st, dt, (hsize_t)OPAQUE_NELMTS, buf, NULL, H5P_DEFAULT)<0) goto error;
+    if (H5Tconvert(st, dt, OPAQUE_NELMTS, buf, NULL, H5P_DEFAULT)<0) goto error;
     if (saved+1 != num_opaque_conversions_g) {
 	H5_FAILED();
 	printf("    unexpected number of opaque conversions\n");
@@ -2954,7 +2955,7 @@ test_conv_int (void)
     /* (unsigned)0x80000000 -> (unsigned)0xffff */
     byte[0] = byte[1] = byte[2] = 0;
     byte[3] = 0x80;
-    if (H5Tconvert (H5T_STD_U32LE, H5T_STD_U16LE, (hsize_t)1, byte, NULL, H5P_DEFAULT)<0) {
+    if (H5Tconvert (H5T_STD_U32LE, H5T_STD_U16LE, 1, byte, NULL, H5P_DEFAULT)<0) {
 	goto error;
     }
     if (byte[0]!=0xff || byte[1]!=0xff) {
@@ -2967,7 +2968,7 @@ test_conv_int (void)
 
     /* (unsigned)0xffffffff -> (signed)0x7fff */
     byte[0] = byte[1] = byte[2] = byte[3] = 0xff;
-    if (H5Tconvert (H5T_STD_U32LE, H5T_STD_I16LE, (hsize_t)1, byte, NULL, H5P_DEFAULT)<0) {
+    if (H5Tconvert (H5T_STD_U32LE, H5T_STD_I16LE, 1, byte, NULL, H5P_DEFAULT)<0) {
 	goto error;
     }
     if (byte[0]!=0xff || byte[1]!=0x7f) {
@@ -2980,7 +2981,7 @@ test_conv_int (void)
 
     /* (signed)0xffffffff -> (unsigned)0x0000 */
     byte[0] = byte[1] = byte[2] = byte[3] = 0xff;
-    if (H5Tconvert (H5T_STD_I32LE, H5T_STD_U16LE, (hsize_t)1, byte, NULL, H5P_DEFAULT)<0) {
+    if (H5Tconvert (H5T_STD_I32LE, H5T_STD_U16LE, 1, byte, NULL, H5P_DEFAULT)<0) {
 	goto error;
     }
     if (byte[0]!=0x00 || byte[1]!=0x00) {
@@ -2994,7 +2995,7 @@ test_conv_int (void)
     /* (signed)0x7fffffff -> (unsigned)0xffff */
     byte[0] = byte[1] = byte[2] = 0xff;
     byte[3] = 0x7f;
-    if (H5Tconvert (H5T_STD_I32LE, H5T_STD_U16LE, (hsize_t)1, byte, NULL, H5P_DEFAULT)<0) {
+    if (H5Tconvert (H5T_STD_I32LE, H5T_STD_U16LE, 1, byte, NULL, H5P_DEFAULT)<0) {
 	goto error;
     }
     if (byte[0]!=0xff || byte[1]!=0xff) {
@@ -3008,7 +3009,7 @@ test_conv_int (void)
     /* (signed)0x7fffffff -> (signed)0x7fff */
     byte[0] = byte[1] = byte[2] = 0xff;
     byte[3] = 0x7f;
-    if (H5Tconvert (H5T_STD_I32LE, H5T_STD_I16LE, (hsize_t)1, byte, NULL, H5P_DEFAULT)<0) {
+    if (H5Tconvert (H5T_STD_I32LE, H5T_STD_I16LE, 1, byte, NULL, H5P_DEFAULT)<0) {
 	goto error;
     }
     if (byte[0]!=0xff || byte[1]!=0x7f) {
@@ -3022,7 +3023,7 @@ test_conv_int (void)
     /* (signed)0xbfffffff -> (signed)0x8000 */
     byte[0] = byte[1] = byte[2] = 0xff;
     byte[3] = 0xbf;
-    if (H5Tconvert (H5T_STD_I32LE, H5T_STD_I16LE, (hsize_t)1, byte, NULL, H5P_DEFAULT)<0) {
+    if (H5Tconvert (H5T_STD_I32LE, H5T_STD_I16LE, 1, byte, NULL, H5P_DEFAULT)<0) {
 	goto error;
     }
     if (byte[0]!=0x00 || byte[1]!=0x80) {
@@ -3222,7 +3223,7 @@ test_conv_int_1(const char *name, hid_t src, hid_t dst)
             buf[j] = saved[j] = HDrand();
 
 	/* Perform the conversion */
-	if (H5Tconvert(src, dst, (hsize_t)nelmts, buf, NULL, H5P_DEFAULT)<0)
+	if (H5Tconvert(src, dst, nelmts, buf, NULL, H5P_DEFAULT)<0)
             goto error;
 
 	/* Check the results from the library against hardware */
@@ -4049,7 +4050,7 @@ test_conv_int_2(void)
 	     * Conversion. If overlap calculations aren't right then an
 	     * assertion will fail in H5T_conv_i_i()
 	     */
-	    H5Tconvert(src_type, dst_type, (hsize_t)100, buf, NULL, H5P_DEFAULT);
+	    H5Tconvert(src_type, dst_type, 100, buf, NULL, H5P_DEFAULT);
 	    H5Tclose(src_type);
 	    H5Tclose(dst_type);
 	}
@@ -4315,7 +4316,7 @@ test_conv_int_float(const char *name, hid_t src, hid_t dst)
             buf[j] = saved[j] = HDrand();
 
 	/* Perform the conversion */
-	if (H5Tconvert(src, dst, (hsize_t)nelmts, buf, NULL, dxpl_id)<0)
+	if (H5Tconvert(src, dst, nelmts, buf, NULL, dxpl_id)<0)
             goto error;
 
 	/* Check the results from the library against hardware */
@@ -5345,7 +5346,7 @@ test_conv_flt_1 (const char *name, hid_t src, hid_t dst)
 	}
 
 	/* Perform the conversion in software */
-	if (H5Tconvert(src, dst, (hsize_t)nelmts, buf, NULL, H5P_DEFAULT)<0)
+	if (H5Tconvert(src, dst, nelmts, buf, NULL, H5P_DEFAULT)<0)
             goto error;
 
 	/* Check the software results against the hardware */
@@ -6019,7 +6020,7 @@ main(void)
 
     /* Test hardware integer conversion functions */
     nerrors += run_integer_tests("hw");
-    
+
     /* Test hardware floating-point conversion functions */
     nerrors += test_conv_flt_1("hw", H5T_NATIVE_FLOAT, H5T_NATIVE_DOUBLE);
     nerrors += test_conv_flt_1("hw", H5T_NATIVE_DOUBLE, H5T_NATIVE_FLOAT);