[svn-r8479] Purpose:

New Feature

Description:
Add the data transform function, H5Pset_transform().

Platforms tested:
"h5committested".
Copper was down.  Ran parallel tests in sol instead.

Misc. update:

8 files changed, 2042 insertions, 18 deletions

diff --git a/src/H5D.c b/src/H5D.c
index 58aa1a3..aae16c6 100644
--- a/src/H5D.c
+++ b/src/H5D.c
@@ -28,6 +28,7 @@
 #include "H5MMprivate.h"	/* Memory management			*/
 #include "H5Sprivate.h"		/* Dataspaces 				*/
 #include "H5Vprivate.h"		/* Vectors and arrays 			*/
+#include "H5Zprivate.h"
 
 /*#define H5D_DEBUG*/
 
@@ -52,6 +53,14 @@ static herr_t H5D_extend(H5D_t *dataset, const hsize_t *size, hid_t dxpl_id);
 static herr_t H5D_set_extent(H5D_t *dataset, const hsize_t *size, hid_t dxpl_id);
 static herr_t H5D_close(H5D_t *dataset);
 
+static herr_t H5D_xfer_xform_set(hid_t prop_id, const char* name, size_t size, void* value);
+static herr_t H5D_xfer_xform_del(hid_t prop_id, const char* name, size_t size, void* value);
+static herr_t H5D_xfer_xform_copy(const char* name, size_t size, void* value);
+static herr_t H5D_xfer_xform_close(const char* name, size_t size, void* value);
+    
+
+
+
 /* Internal data structure for computing variable-length dataset's total size */
 typedef struct {
     hid_t dataset_id;   /* ID of the dataset we are working on */
@@ -128,6 +137,7 @@ H5D_init_interface(void)
 {
     /* Dataset Transfer property class variables.  In sequence, they are,
      * - Transfer Property list class to modify
+     * - Default value for maximum data transform buffer size
      * - Default value for maximum temp buffer size
      * - Default value for type conversion buffer
      * - Default value for background buffer
@@ -148,6 +158,7 @@ H5D_init_interface(void)
      * - Default value for datatype conversion callback
      */
     H5P_genclass_t  *xfer_pclass;   
+    void*           def_xfer_xform           = H5D_XFER_XFORM_DEF; 
     size_t          def_max_temp_buf         = H5D_XFER_MAX_TEMP_BUF_DEF;
     void            *def_tconv_buf           = H5D_XFER_TCONV_BUF_DEF;
     void            *def_bkgr_buf            = H5D_XFER_BKGR_BUF_DEF;   
@@ -189,7 +200,7 @@ H5D_init_interface(void)
     H5P_genplist_t *def_dcpl;               /* Default Dataset Creation Property list */
     size_t          nprops;                 /* Number of properties */
     herr_t          ret_value                = SUCCEED;   /* Return value */
-
+           
     FUNC_ENTER_NOAPI_NOINIT(H5D_init_interface)
 
     /* Initialize the atom group for the dataset IDs */
@@ -210,6 +221,10 @@ H5D_init_interface(void)
 
     /* Assume that if there are properties in the class, they are the default ones */
     if(nprops==0) {
+        /* Register the data transform property */
+        if(H5P_register(xfer_pclass,H5D_XFER_XFORM,H5D_XFER_XFORM_SIZE,&def_xfer_xform,NULL,H5D_XFER_XFORM_SET,NULL,H5D_XFER_XFORM_DEL,H5D_XFER_XFORM_COPY,NULL,H5D_XFER_XFORM_CLOSE)<0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
+        
         /* Register the max. temp buffer size property */
         if(H5P_register(xfer_pclass,H5D_XFER_MAX_TEMP_BUF_NAME,H5D_XFER_MAX_TEMP_BUF_SIZE,&def_max_temp_buf,NULL,NULL,NULL,NULL,NULL,NULL,NULL)<0)
             HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
@@ -439,6 +454,219 @@ H5D_term_interface(void)
     FUNC_LEAVE_NOAPI(n)
 }
 
+
+/*-------------------------------------------------------------------------
+ * Function: H5D_xfer_xform_set
+ *
+ * Purpose: Callback for setting a data transform property.  This generates
+ * the parse tree for the data transform, as well as saving the transform
+ * locally.
+ *
+ * Return: Success: SUCCEED, Failure: FAIL
+ *
+ * Programmer: Leon Arber, larber@uiuc.edu
+ *
+ * Date: April 9, 2004
+ *
+ * Comments: private, calls H5Z_xform_parse and H5Z_xform_reduce_tree
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5D_xfer_xform_set(hid_t prop_id, const char UNUSED *name, size_t UNUSED size, void* value)
+{
+    H5P_genplist_t *new_plist;
+    void*          parse_root;
+    H5Z_data_xform*    data_xform_prop;
+    int            exp_size;
+    herr_t         ret_value=SUCCEED;
+
+    exp_size  = strlen(*(char**)value) + 1;
+    data_xform_prop = (H5Z_data_xform*) HDmalloc(sizeof(H5Z_data_xform));
+    
+    FUNC_ENTER_NOAPI(H5D_xfer_xform_set, FAIL)
+
+        /* Verify property list ID */
+   if (NULL == (new_plist = H5I_object(prop_id)))
+      HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data transform property list")
+           
+   if (value == NULL)
+       HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cannot parse a null expression")
+   else
+   {
+#ifdef H5Z_XFORM_DEBUG
+       printf("Adding a new dataset transfer prop.  Parsing a new tree from %s\n",*(char**) value);
+#endif    
+      
+        /* copy the user's string into the property */
+       data_xform_prop->xform_exp = HDmalloc(exp_size);
+       strncpy(data_xform_prop->xform_exp, *(char**)value, exp_size);        
+       
+       
+       /* we generate the parse tree right here and store a poitner to its root in the property. */
+       parse_root = H5Z_xform_parse(*(H5Z_node**)value);
+       H5Z_xform_reduce_tree((H5Z_node*)parse_root);
+       if(parse_root)
+       {
+           data_xform_prop->parse_root = parse_root;
+           HDmemcpy(value, &data_xform_prop, sizeof(void*));
+       }
+       else
+       {       
+           /* if we couldn't parse the user's string, we're not going to store it */
+           data_xform_prop->parse_root = NULL;
+           free(data_xform_prop->xform_exp);
+           data_xform_prop->xform_exp = NULL;
+           free(data_xform_prop);
+           *(H5Z_data_xform**)value = NULL;
+           HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "error parsing data transform expression")
+       }
+   }
+done:
+    FUNC_LEAVE_NOAPI(ret_value)  
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5D_xfer_xform_del
+ *
+ * Purpose: Frees memory allocated by H5D_xfer_xform_set 
+ *
+ * Return: Success: SUCCEED, Failure: FAIL
+ *
+ * Programmer: Leon Arber larber@uiuc.edu
+ *           
+ *
+ * Date: April 9, 2004
+ *
+ * Comments: Private function, calls private H5Z_xform_destroy_parse_tree
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5D_xfer_xform_del(hid_t UNUSED prop_id, const char UNUSED *name, size_t UNUSED size, void *value)
+{
+#ifdef H5Z_XFORM_DEBUG
+    fprintf(stderr, "Freeing memory b/c of delete\n");
+#endif
+    herr_t ret_value = SUCCEED;
+    
+    FUNC_ENTER_NOAPI(H5D_xfer_xform_del, FAIL)
+
+    assert(value);
+ 
+   
+    if( *(H5Z_data_xform**)value != NULL) 
+    {
+        H5Z_xform_destroy_parse_tree(((*((H5Z_data_xform**)value)))->parse_root);
+        HDfree(((*((H5Z_data_xform**)value)))->xform_exp);
+        HDfree(*(H5Z_data_xform**)value);    
+        *(H5Z_data_xform**)value = NULL; 
+    }
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+
+}
+
+/*-------------------------------------------------------------------------
+ * Function: H5D_xfer_xform_copy
+ *
+ * Purpose: Creates a copy of the user's data transform string and its
+ * associated parse tree.
+ *
+ * Return: Success: SUCCEED, Failure: FAIL
+ *
+ * Programmer: Leon Arber larber@uiuc.edu
+ *          
+ *
+ * Date: April 9, 2004
+ *
+ * Comments: Public function, calls private H5Z_xform_copy_tree
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5D_xfer_xform_copy(const char UNUSED *name, size_t UNUSED size, void *value)
+{
+    H5Z_node*   new_tree;
+    herr_t ret_value = SUCCEED;
+    
+    FUNC_ENTER_NOAPI(H5D_xfer_xform_copy, FAIL)
+
+   /* this will involved generating a new parse tree by copying every single node in the old one */
+        H5Z_data_xform*    data_xform_prop;
+    data_xform_prop = (H5Z_data_xform*) HDmalloc(sizeof(H5Z_data_xform));
+
+    data_xform_prop->xform_exp = (char*) HDmalloc(strlen( ((*(H5Z_data_xform**)value))->xform_exp) + 1); 
+    strcpy(data_xform_prop->xform_exp, ((*(H5Z_data_xform**)value))->xform_exp);
+    if( (new_tree = (H5Z_node*)H5Z_xform_copy_tree( ((*(H5Z_data_xform**)value))->parse_root)) == NULL)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "error copying the parse tree")
+    else
+        data_xform_prop->parse_root = new_tree;
+
+    *(H5Z_data_xform**)value = data_xform_prop;
+    
+done:
+FUNC_LEAVE_NOAPI(ret_value)
+
+
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5D_xfer_xform_close
+ *
+ * Purpose: Frees memory allocated by H5D_xfer_xform_set
+ *
+ * Return: Success: SUCCEED, Failure: FAIL
+ *
+ * Programmer: Leon Arber larber@uiuc.edu
+ *
+ * Date: April 9, 2004
+ *
+ * Comments: private function, calls H5Z_xform_destroy_parse_tree
+ *              Identical to H5D_xfer_xform_del
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5D_xfer_xform_close(const char UNUSED *name, size_t UNUSED size, void *value)
+{
+#ifdef H5Z_XFORM_DEBUG
+    fprintf(stderr, "Freeing memory b/c of close\n");
+#endif
+    herr_t ret_value = SUCCEED;
+    
+    FUNC_ENTER_NOAPI(H5D_xfer_xform_close, FAIL)
+   
+    assert(value);
+    
+    if( *(H5Z_data_xform**)value != NULL) 
+    {
+        H5Z_xform_destroy_parse_tree(((*((H5Z_data_xform**)value)))->parse_root);
+        HDfree(((*((H5Z_data_xform**)value)))->xform_exp);
+        HDfree(*(H5Z_data_xform**)value);    
+        *(H5Z_data_xform**)value = NULL;
+    }
+
+  
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+}
+
+
+
+
+
 
 /*-------------------------------------------------------------------------
  * Function:       H5D_crt_copy
@@ -3560,7 +3788,7 @@ done:
  * Purpose: Modifies the dimensions of a dataset, based on H5Dextend. 
  *  Can change to a lower dimension.
  *
- * Return: Success: 0, Failure: -1
+ * Return: Success: SUCCEED, Failure: FAIL
  *
  * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
  *             Robb Matzke
@@ -3603,7 +3831,7 @@ done:
  * Purpose: Based in H5D_extend, allows change to a lower dimension, 
  *  calls H5S_set_extent and H5F_istore_prune_by_extent instead
  *
- * Return: Success: 0, Failure: -1
+ * Return: Success: SUCCEED, Failure: FAIL
  *
  * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
  *             Robb Matzke
diff --git a/src/H5Dio.c b/src/H5Dio.c
index 227d0d7..48492b2 100644
--- a/src/H5Dio.c
+++ b/src/H5Dio.c
@@ -27,6 +27,8 @@
 #include "H5Sprivate.h"		/* Dataspace functions			*/
 #include "H5TBprivate.h"	/* Threaded, balanced, binary trees (TBBTs) */
 #include "H5Vprivate.h"		/* Vector and array functions		*/
+#include "H5Tpublic.h"
+#include "H5Zprivate.h"
 
 /*#define H5D_DEBUG*/
 
@@ -129,6 +131,7 @@ H5FL_BLK_DEFINE(type_conv);
 /* Declare a free list to manage the H5D_chunk_info_t struct */
 H5FL_DEFINE_STATIC(H5D_chunk_info_t);
 
+
 
 /*--------------------------------------------------------------------------
  NAME
@@ -306,7 +309,10 @@ H5D_get_dxpl_cache_real(hid_t dxpl_id, H5D_dxpl_cache_t *cache)
     /* Get the dataset transfer property list */
     if (NULL == (dx_plist = H5I_object(dxpl_id)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset transfer property list")
-
+    
+    /* Get the data transform property */
+    H5P_get(dx_plist, H5D_XFER_XFORM, &cache->data_xform_prop);
+            
     /* Get maximum temporary buffer size */
     if(H5P_get(dx_plist, H5D_XFER_MAX_TEMP_BUF_NAME, &cache->max_temp_buf)<0)
         HGOTO_ERROR (H5E_PLIST, H5E_CANTGET, FAIL, "Can't retrieve maximum temporary buffer size")
@@ -1030,6 +1036,8 @@ done:
  * Modifications:
  *      QAK - 2003/04/17
  *      Hacked on it a lot. :-)
+ *      Leon Arber: 4/20/04
+ *      Added support for data transforms.
  *
  *-------------------------------------------------------------------------
  */
@@ -1062,13 +1070,19 @@ H5D_contig_read(hsize_t nelmts, H5D_t *dataset, const H5T_t *mem_type,
     hsize_t	n, smine_nelmts;	/*elements per strip	*/
     herr_t	ret_value = SUCCEED;	/*return value		*/
 
+    hid_t array_type;
+       
     FUNC_ENTER_NOAPI_NOINIT(H5D_contig_read)
-    
+ 
+    /* Inits for data transforms, if needed */    
+    array_type = H5Z_xform_find_type(mem_type);
+
     /*
      * If there is no type conversion then read directly into the
      * application's buffer.  This saves at least one mem-to-mem copy.
      */
-    if (H5T_path_noop(tpath)) {
+                
+    if ( (dxpl_cache->data_xform_prop == NULL) && H5T_path_noop(tpath)) {
 #ifdef H5S_DEBUG
 	H5_timer_begin(&timer);
 #endif
@@ -1090,10 +1104,10 @@ H5D_contig_read(hsize_t nelmts, H5D_t *dataset, const H5T_t *mem_type,
         if (status<0) {
             HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "optimized read failed")
         } else
-	    /* direct xfer accomplished successfully */
+            /* direct xfer accomplished successfully */
             HGOTO_DONE(SUCCEED)
     } /* end if */
-    
+
     /*
      * This is the general case(type conversion).
      */
@@ -1205,6 +1219,15 @@ H5D_contig_read(hsize_t nelmts, H5D_t *dataset, const H5T_t *mem_type,
         if (H5T_convert(tpath, src_id, dst_id, smine_nelmts, 0, 0, tconv_buf, bkg_buf, dxpl_id)<0)
             HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "data type conversion failed")
 
+
+        /* Added by LA to do data transforms */
+
+        if(dxpl_cache->data_xform_prop)
+            H5Z_xform_eval(dxpl_cache->data_xform_prop->parse_root, tconv_buf, smine_nelmts, array_type);
+
+        /* end of LA additions */
+
+
         /*
          * Scatter the data into memory.
          */
@@ -1213,6 +1236,8 @@ H5D_contig_read(hsize_t nelmts, H5D_t *dataset, const H5T_t *mem_type,
 #endif
         status = H5S_select_mscat(tconv_buf, mem_space,
                           &mem_iter, smine_nelmts, dxpl_cache, buf/*out*/);
+
+
 #ifdef H5S_DEBUG
 	H5_timer_end(&(sconv->stats[1].scat_timer), &timer);
 	sconv->stats[1].scat_nbytes += smine_nelmts * dst_type_size;
@@ -1260,6 +1285,8 @@ done:
  * Modifications:
  *      QAK - 2003/04/17
  *      Hacked on it a lot. :-)
+ *      Leon Arber: 4/20/04
+ *      Added support for data transforms.
  *
  *-------------------------------------------------------------------------
  */
@@ -1290,14 +1317,21 @@ H5D_contig_write(hsize_t nelmts, H5D_t *dataset, const H5T_t *mem_type, const H5
     hsize_t	smine_start;		/*strip mine start loc	*/
     hsize_t	n, smine_nelmts;	/*elements per strip	*/
     herr_t	ret_value = SUCCEED;	/*return value		*/
-
-    FUNC_ENTER_NOAPI_NOINIT(H5D_contig_write)
     
+    hid_t array_type;
+            
+    FUNC_ENTER_NOAPI_NOINIT(H5D_contig_write)
+ 
+    /*TODO: This should be the type of the destination file...not the memory source.  Where do we get this? */
+    /* Inits for the data transform, if needed */
+    array_type = H5Z_xform_find_type(mem_type);
+   
     /*
      * If there is no type conversion then write directly from the
      * application's buffer.  This saves at least one mem-to-mem copy.
      */
-    if (H5T_path_noop(tpath)) {
+
+    if ( (dxpl_cache->data_xform_prop == NULL) &&  H5T_path_noop(tpath)) {
 #ifdef H5S_DEBUG
 	H5_timer_begin(&timer);
 #endif
@@ -1305,10 +1339,11 @@ H5D_contig_write(hsize_t nelmts, H5D_t *dataset, const H5T_t *mem_type, const H5
         status = (sconv->write)(dataset->ent.file, &(dataset->layout),
                 &dataset->dcpl_cache, (H5D_storage_t *)&(dataset->efl), (size_t)nelmts, H5T_get_size(dataset->type),
                 file_space, mem_space, dxpl_cache, dxpl_id, buf);
+
 #ifdef H5S_DEBUG
-	    H5_timer_end(&(sconv->stats[0].write_timer), &timer);
-	    sconv->stats[0].write_nbytes += nelmts * H5T_get_size(mem_type);
-	    sconv->stats[0].write_ncalls++;
+        H5_timer_end(&(sconv->stats[0].write_timer), &timer);
+        sconv->stats[0].write_nbytes += nelmts * H5T_get_size(mem_type);
+        sconv->stats[0].write_ncalls++;
 #endif
 
         /* Check return value from optimized write */
@@ -1437,6 +1472,11 @@ H5D_contig_write(hsize_t nelmts, H5D_t *dataset, const H5T_t *mem_type, const H5
 #ifdef H5S_DEBUG
         H5_timer_begin(&timer);
 #endif
+ 
+       /* LA additions for data transforms */ 
+        if(dxpl_cache->data_xform_prop)
+            H5Z_xform_eval(dxpl_cache->data_xform_prop->parse_root, tconv_buf, smine_nelmts, array_type);
+        /* End of LA modifications */
         status = H5S_select_fscat(dataset->ent.file, &(dataset->layout), 
               &dataset->dcpl_cache, (H5D_storage_t *)&(dataset->efl), file_space, &file_iter,
               smine_nelmts, dxpl_cache, dxpl_id, tconv_buf);
@@ -1451,6 +1491,7 @@ H5D_contig_write(hsize_t nelmts, H5D_t *dataset, const H5T_t *mem_type, const H5
     } /* end for */
 
 done:
+
     /* Release selection iterators */
     if(file_iter_init) {
         if(H5S_select_iter_release(&file_iter)<0)
@@ -1487,7 +1528,10 @@ done:
  * Modifications:
  *      QAK - 2003/04/17
  *      Hacked on it a lot. :-)
+ *      Leon Arber: 4/20/04
+ *      Added support for data transforms.
  *
+
  *-------------------------------------------------------------------------
  */
 /* ARGSUSED */
@@ -1524,18 +1568,21 @@ UNUSED
     uint8_t	*bkg_buf = NULL;	/*background buffer	*/
     H5D_storage_t store;                /*union of EFL and chunk pointer in file space */
     herr_t	ret_value = SUCCEED;	/*return value		*/
-
+    hid_t array_type;
+    
     FUNC_ENTER_NOAPI_NOINIT(H5D_chunk_read)
     
     /* Map elements between file and memory for each chunk*/
     if(H5D_create_chunk_map(dataset, mem_type, file_space, mem_space, &fm)<0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't build chunk mapping")
 
+    array_type = H5Z_xform_find_type(mem_type);
+            
     /*
      * If there is no type conversion then read directly into the
      * application's buffer.  This saves at least one mem-to-mem copy.
      */
-    if (H5T_path_noop(tpath)) {
+    if ( (dxpl_cache->data_xform_prop == NULL) && H5T_path_noop(tpath)) {
 #ifdef H5S_DEBUG
 	H5_timer_begin(&timer);
 #endif
@@ -1705,6 +1752,13 @@ UNUSED
                     tconv_buf, bkg_buf, dxpl_id)<0)
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "data type conversion failed")
 
+           /* LA additions for data transforms */
+             if(dxpl_cache->data_xform_prop)
+                H5Z_xform_eval(dxpl_cache->data_xform_prop->parse_root, tconv_buf, smine_nelmts, array_type);
+
+
+
+                    
             /*
              * Scatter the data into memory.
              */
@@ -1784,6 +1838,8 @@ done:
  * Modifications:
  *      QAK - 2003/04/17
  *      Hacked on it a lot. :-)
+ *      Leon Arber: 4/20/04
+ *      Added support for data transforms.
  *
  *-------------------------------------------------------------------------
  */
@@ -1821,9 +1877,12 @@ nelmts, H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
     uint8_t	*bkg_buf = NULL;	/*background buffer	*/
     H5D_storage_t store;                /*union of EFL and chunk pointer in file space */
     herr_t	ret_value = SUCCEED;	/*return value		*/
+    hid_t       array_type;
 
     FUNC_ENTER_NOAPI_NOINIT(H5D_chunk_write)
     
+    array_type = H5Z_xform_find_type(mem_type);
+     
 #ifdef QAK
 {
     int mpi_rank;
@@ -1850,7 +1909,7 @@ nelmts, H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
      * If there is no type conversion then write directly from the
      * application's buffer.  This saves at least one mem-to-mem copy.
      */
-    if (H5T_path_noop(tpath)) {
+    if ((dxpl_cache->data_xform_prop == NULL) &&  H5T_path_noop(tpath)) {
 #ifdef H5S_DEBUG
 	H5_timer_begin(&timer);
 #endif
@@ -2043,6 +2102,13 @@ nelmts, H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
                     tconv_buf, bkg_buf, dxpl_id)<0)
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "data type conversion failed")
 
+            /* LA additions for data transforms */
+              if(dxpl_cache->data_xform_prop)
+                 H5Z_xform_eval(dxpl_cache->data_xform_prop->parse_root, tconv_buf, smine_nelmts, array_type);
+
+
+
+                    
             /*
              * Scatter the data out to the file.
              */
diff --git a/src/H5Dprivate.h b/src/H5Dprivate.h
index e52f51c..5489659 100644
--- a/src/H5Dprivate.h
+++ b/src/H5Dprivate.h
@@ -74,6 +74,15 @@
 #define H5D_CRT_DATA_PIPELINE_CMP  H5D_crt_data_pipeline_cmp
 
 /* ======== Data transfer properties ======== */
+/* Definitions for data transform property */
+#define H5D_XFER_XFORM              "data_transform"
+#define H5D_XFER_XFORM_SIZE         sizeof(void *)
+#define H5D_XFER_XFORM_DEF          NULL
+#define H5D_XFER_XFORM_SET              H5D_xfer_xform_set             
+#define H5D_XFER_XFORM_DEL              H5D_xfer_xform_del
+#define H5D_XFER_XFORM_COPY             H5D_xfer_xform_copy
+#define H5D_XFER_XFORM_CLOSE            H5D_xfer_xform_close
+                                   
 /* Definitions for maximum temp buffer size property */
 #define H5D_XFER_MAX_TEMP_BUF_NAME       "max_temp_buf"
 #define H5D_XFER_MAX_TEMP_BUF_SIZE       sizeof(size_t)
@@ -171,6 +180,7 @@ typedef struct H5D_dxpl_cache_t {
 #endif /*H5_HAVE_PARALLEL*/
     H5Z_EDC_t err_detect;       /* Error detection info (H5D_XFER_EDC_NAME) */
     H5Z_cb_t filter_cb;         /* Filter callback function (H5D_XFER_FILTER_CB_NAME) */
+    H5Z_data_xform* data_xform_prop; /* Data transform prop (H5D_XFER_XFORM) */
 } H5D_dxpl_cache_t;
 
 /* Typedef for cached dataset creation property list information */
diff --git a/src/H5Pdxpl.c b/src/H5Pdxpl.c
index 04f4783..36bf77e 100644
--- a/src/H5Pdxpl.c
+++ b/src/H5Pdxpl.c
@@ -31,6 +31,51 @@ static int             interface_initialize_g = 0;
 
 /* Static function prototypes */
 
+/*-------------------------------------------------------------------------
+ * Function:	H5Pset_data_transform
+ *
+ * Purpose:
+ *              Sets data transform expression. 
+ *
+ * 
+ * Return:      Returns a non-negative value if successful; otherwise returns a negative value. 
+ * 
+ * 
+ * Programmer:	Leon Arber
+ *              Monday, March 07, 2004
+ * 
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t H5Pset_data_transform(hid_t plist_id, char* expression)
+{
+    H5P_genplist_t *plist;      /* Property list pointer */
+    herr_t ret_value=SUCCEED;   /* return value */
+
+    FUNC_ENTER_API(H5Pset_data_transform, FAIL);
+    
+    /*    H5TRACE4("e","izxx",plist_id,expression); */
+
+    /* Check arguments */
+    if (expression == NULL)
+        HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "expression cannot be NULL");
+
+    /* Get the plist structure */
+    if(NULL == (plist = H5P_object_verify(plist_id,H5P_DATASET_XFER)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID");
+
+    /* Update property list */
+    if(H5P_set(plist, H5D_XFER_XFORM, &expression)<0)
+        HGOTO_ERROR (H5E_PLIST, H5E_CANTSET, FAIL, "Error setting data transform expression");
+
+done:
+    FUNC_LEAVE_API(ret_value);
+}
+
+
+
+
 
 /*-------------------------------------------------------------------------
  * Function:	H5Pset_buffer
diff --git a/src/H5Ppublic.h b/src/H5Ppublic.h
index cae9337..8368c84 100644
--- a/src/H5Ppublic.h
+++ b/src/H5Ppublic.h
@@ -197,6 +197,7 @@ H5_DLL herr_t H5Pset_layout(hid_t plist_id, H5D_layout_t layout);
 H5_DLL H5D_layout_t H5Pget_layout(hid_t plist_id);
 H5_DLL herr_t H5Pset_chunk(hid_t plist_id, int ndims, const hsize_t dim[]);
 H5_DLL int H5Pget_chunk(hid_t plist_id, int max_ndims, hsize_t dim[]/*out*/);
+H5_DLL herr_t H5Pset_data_transform(hid_t plist_id, char* expression);
 H5_DLL herr_t H5Pset_external(hid_t plist_id, const char *name, off_t offset,
           hsize_t size);
 H5_DLL int H5Pget_external_count(hid_t plist_id);
@@ -217,6 +218,7 @@ H5_DLL herr_t H5Pset_family_offset(hid_t fapl_id, hsize_t offset);
 H5_DLL herr_t H5Pget_family_offset(hid_t fapl_id, hsize_t *offset);
 H5_DLL herr_t H5Pset_multi_type(hid_t fapl_id, H5FD_mem_t type);
 H5_DLL herr_t H5Pget_multi_type(hid_t fapl_id, H5FD_mem_t *type);
+
 H5_DLL herr_t H5Pset_buffer(hid_t plist_id, size_t size, void *tconv,
         void *bkg);
 H5_DLL size_t H5Pget_buffer(hid_t plist_id, void **tconv/*out*/,
diff --git a/src/H5Zprivate.h b/src/H5Zprivate.h
index d87f735..48620be 100644
--- a/src/H5Zprivate.h
+++ b/src/H5Zprivate.h
@@ -19,6 +19,10 @@
 #ifndef _H5Zprivate_H
 #define _H5Zprivate_H
 
+#include "H5private.h"          /* Generic Functions                    */
+#include "H5Tprivate.h"
+#include "H5Eprivate.h"
+#include "H5Iprivate.h"
 #include "H5Zpublic.h"
 
 /* Structure to store information about each filter's parameters */
@@ -30,6 +34,41 @@ typedef struct {
     unsigned		*cd_values;	/*client data values		     */
 } H5Z_filter_info_t;
 
+
+/* Token types */
+typedef enum {
+    ERROR,
+    H5Z_INTEGER, /* this represents an integer type in the data transform expression */
+    H5Z_FLOAT,  /* this represents a floating point type in the data transform expression */
+    SYMBOL,
+    PLUS,
+    MINUS,
+    MULT,
+    DIVIDE,
+    LPAREN,
+    RPAREN,
+    END
+} H5Z_token_type;
+
+typedef union {
+    char   *sym_val;
+    long    int_val;
+    double  float_val;
+} H5Z_num_val;
+
+
+typedef struct H5Z_node {
+    struct H5Z_node    *lchild;
+    struct H5Z_node    *rchild;
+    H5Z_token_type      type;
+    H5Z_num_val         value;
+} H5Z_node;
+
+typedef struct {
+    char*       xform_exp;
+    H5Z_node*       parse_root;
+} H5Z_data_xform;
+
 /* Special parameters for szip compression */
 /* [These are aliases for the similar definitions in szlib.h, which we can't
  * include directly due to the duplication of various symbols with the zlib.h
@@ -60,5 +99,13 @@ H5_DLL H5Z_filter_info_t *H5Z_filter_info(const struct H5O_pline_t *pline,
 H5_DLL htri_t H5Z_all_filters_avail(const struct H5O_pline_t *pline);
 H5_DLL herr_t H5Z_delete(struct H5O_pline_t *pline, H5Z_filter_t filter);
 
+/* Data Transform Functions */
+H5_DLL void H5Z_xform_destroy_parse_tree(H5Z_node *tree);
+H5_DLL void H5Z_xform_eval(H5Z_node *tree, void* array, hsize_t array_size, hid_t array_type);
+H5_DLL void* H5Z_xform_parse(const char *expression);
+H5_DLL hid_t H5Z_xform_find_type(H5T_t* type);
+H5_DLL void H5Z_xform_reduce_tree(H5Z_node* tree);
+H5_DLL void* H5Z_xform_copy_tree(H5Z_node* tree);
+
 
 #endif
diff --git a/src/H5Ztrans.c b/src/H5Ztrans.c
new file mode 100644
index 0000000..3aa4595
--- /dev/null
+++ b/src/H5Ztrans.c
@@ -0,0 +1,1626 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ 
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
+ * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include "H5Zprivate.h"
+
+typedef struct result {
+    H5Z_token_type type;
+    H5Z_num_val    value;
+    H5T_class_t ar_type;
+} H5Z_result;
+
+
+/* The token */
+typedef struct {
+    const char *tok_expr;       /* Holds the original expression        */
+
+    /* Current token values */
+    H5Z_token_type  tok_type;       /* The type of the current token        */
+    const char *tok_begin;      /* The beginning of the current token   */
+    const char *tok_end;        /* The end of the current token         */
+
+    /* Previous token values */
+    H5Z_token_type  tok_last_type;  /* The type of the last token           */
+    const char *tok_last_begin; /* The beginning of the last token      */
+    const char *tok_last_end;   /* The end of the last token            */
+} H5Z_token;
+
+
+
+
+/* Interface initialization */
+static int interface_initialize_g = 0;
+#define INTERFACE_INIT NULL 
+
+static H5Z_token *H5Z_get_token(H5Z_token *current);
+static H5Z_node *H5Z_parse_expression(H5Z_token *current);
+static H5Z_node *H5Z_parse_term(H5Z_token *current);
+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 H5Z_result H5Z_eval_full(H5Z_node *tree, void* array, hsize_t array_size, hid_t array_type);
+
+
+#ifdef H5Z_XFORM_DEBUG
+static void H5Z_XFORM_DEBUG(H5Z_node *tree);
+static void H5Z_print(H5Z_node *tree, FILE *stream);
+#endif  /* H5Z_XFORM_DEBUG */
+
+
+/*
+ *  Programmer: Bill Wendling <wendling@ncsa.uiuc.edu>
+ *              25. August 2003
+ */
+
+/*
+ * This is the context-free grammar for our expressions:
+ *
+ * expr     :=  term    | term '+ term      | term '-' term
+ * term     :=  factor  | factor '*' factor | factor '/' factor
+ * factor   :=  number      |
+ *              symbol      |
+ *              '-' factor  |   // unary minus
+ *              '+' factor  |   // unary plus
+ *              '(' expr ')'
+ * symbol   :=  [a-zA-Z][a-zA-Z0-9]*
+ * number   :=  H5Z_INTEGER | FLOAT
+ *      // H5Z_INTEGER is a C long int
+ *      // FLOAT is a C double
+ */
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_unget_token
+ * Purpose:     Rollback the H5Z_token to the previous H5Z_token retrieved. There
+ *              should only need to be one level of rollback necessary
+ *              for our grammar.
+ * Return:      Always succeeds.
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+  *              Leon Arber:  Added FUNC_ENTER / FUNC_LEAVE pairs
+*
+ *-------------------------------------------------------------------------
+ */
+static void
+H5Z_unget_token(H5Z_token *current)
+{
+    /* check args */
+    assert(current);
+
+
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5Z_unget_token)
+    
+    current->tok_type = current->tok_last_type;
+    current->tok_begin = current->tok_last_begin;
+    current->tok_end = current->tok_last_end;
+
+    FUNC_LEAVE_NOAPI_VOID
+            
+    
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_get_token
+ * Purpose:     Determine what the next valid H5Z_token is in the expression
+ *              string. The current position within the H5Z_token string is
+ *              kept internal to the H5Z_token and handled by this and the
+ *              unget_H5Z_token function.
+ * Return:      Succeess:       The passed in H5Z_token with a valid tok_type
+ *                              field.
+ *              NULLure:        The passed in H5Z_token but with the tok_type
+ *                              field set to ERROR.
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+ *               Leon Arber:  Added FUNC_ENTER / FUNC_LEAVE pairs
+ *-------------------------------------------------------------------------
+ */
+static H5Z_token *
+H5Z_get_token(H5Z_token *current)
+{
+    
+    void*         ret_value=current;
+    
+    FUNC_ENTER_NOAPI(H5Z_get_token, NULL)
+
+    
+    /* check args */
+    assert(current);
+
+    /* Save the last position for possible ungets */
+    current->tok_last_type = current->tok_type;
+    current->tok_last_begin = current->tok_begin;
+    current->tok_last_end = current->tok_end;
+
+    current->tok_begin = current->tok_end;
+
+    while (current->tok_begin[0] != '\0') {
+        if (isspace(current->tok_begin[0])) {
+            /* ignore whitespace */
+        } else if (isdigit(current->tok_begin[0]) ||
+                   current->tok_begin[0] == '.') {
+            current->tok_end = current->tok_begin;
+
+            /*
+             * H5Z_INTEGER          :=  digit-sequence
+             * digit-sequence   :=  digit | digit digit-sequence
+             * digit            :=  0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
+             */
+            if (current->tok_end[0] != '.') {
+                /* is number */
+                current->tok_type = H5Z_INTEGER;
+
+                while (isdigit(current->tok_end[0]))
+                    ++current->tok_end;
+            }
+
+            /*
+             * float            :=  digit-sequence exponent |
+             *                      dotted-digits exponent?
+             * dotted-digits    :=  digit-sequence '.' digit-sequence?  |
+             *                      '.' digit-sequence
+             * exponent         :=  [Ee] [-+]? digit-sequence
+             */
+            if (current->tok_end[0] == '.' ||
+                    current->tok_end[0] == 'e' ||
+                    current->tok_end[0] == 'E') {
+                current->tok_type = H5Z_FLOAT;
+
+                if (current->tok_end[0] == '.')
+                    do {
+                        ++current->tok_end;
+                    } while (isdigit(current->tok_end[0]));
+
+                if (current->tok_end[0] == 'e' ||
+                    current->tok_end[0] == 'E') {
+                    ++current->tok_end;
+
+                    if (current->tok_end[0] == '-' ||
+                        current->tok_end[0] == '+')
+                        ++current->tok_end;
+
+                    if (!isdigit(current->tok_end[0])) {
+                        current->tok_type = ERROR;
+                        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, current, "Invalidly formatted floating point number")
+                    }
+
+                    while (isdigit(current->tok_end[0]))
+                        ++current->tok_end;
+                }
+
+                /* Check that this is a properly formatted numerical value */
+                if (isalpha(current->tok_end[0]) || current->tok_end[0] == '.') {
+                    current->tok_type = ERROR;
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, current, "Invalidly formatted floating point number")
+                }
+            }
+
+            break;
+        } else if (isalpha(current->tok_begin[0])) {
+            /* is symbol */
+            current->tok_type = SYMBOL;
+            current->tok_end = current->tok_begin;
+
+            while (isalnum(current->tok_end[0]))
+                ++current->tok_end;
+
+            break;
+        } else {
+            /* should be +, -, *, /, (, or ) */
+            switch (current->tok_begin[0]) {
+                case '+':   current->tok_type = PLUS;    break;
+                case '-':   current->tok_type = MINUS;   break;
+                case '*':   current->tok_type = MULT;    break;
+                case '/':   current->tok_type = DIVIDE;  break;
+                case '(':   current->tok_type = LPAREN;  break;
+                case ')':   current->tok_type = RPAREN;  break;
+                default:
+                    current->tok_type = ERROR;
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, current, "Unknown H5Z_token in data transform expression ")
+            }
+
+            current->tok_end = current->tok_begin + 1;
+            break;
+        }
+
+        ++current->tok_begin;
+    }
+
+    if (current->tok_begin[0] == '\0')
+        current->tok_type = END;
+
+    HGOTO_DONE(current);
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+      
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_xform_destroy_parse_tree
+ * Purpose:     Recursively destroys the expression tree.
+ * Return:      Nothing
+ * Programmer:  Bill Wendling
+ *              25. August 2003
+ * Modifications:
+ *              Leon Arber: Added FUNC_ENTER / FUNC_LEAVE pairs
+ *
+ *-------------------------------------------------------------------------
+ */
+void
+H5Z_xform_destroy_parse_tree(H5Z_node *tree)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5Z_xform_destroy_parse_tree)
+    
+    if (!tree)
+        return;
+
+    if (tree->type == SYMBOL)
+        HDfree(tree->value.sym_val);
+
+    H5Z_xform_destroy_parse_tree(tree->lchild);
+    H5Z_xform_destroy_parse_tree(tree->rchild);
+    HDfree(tree);
+    tree = NULL;
+
+    FUNC_LEAVE_NOAPI_VOID
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_parse
+ * Purpose:     Entry function for parsing the expression string.
+ * Return:      Success:    Valid H5Z_node ptr to an expression tree.
+ *              NULLure:    NULL
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+ *              Leon Arber:  Added FUNC_ENTER / FUNC_LEAVE pairs
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5Z_xform_parse(const char *expression)
+{
+    H5Z_token tok;
+    void* ret_value;
+   
+    FUNC_ENTER_NOAPI(H5Z_xform_parse, NULL)
+    
+    if (!expression)
+        return NULL;
+
+    /* Set up the initial H5Z_token for parsing */
+    tok.tok_expr = tok.tok_begin = tok.tok_end = expression;
+    
+    ret_value = (void*)H5Z_parse_expression(&tok);
+    
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_parse_expression
+ * Purpose:     Beginning of the recursive descent parser to parse the
+ *              expression. An expression is:
+ *
+ *                  expr     :=  term | term '+' term | term '-' term
+ *
+ * Return:      Success:    Valid H5Z_node ptr to expression tree
+ *              NULLure:    NULL
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+  *              Leon Arber: Added FUNC_ENTER / FUNC_LEAVE pairs
+*
+ *-------------------------------------------------------------------------
+ */
+static H5Z_node *
+H5Z_parse_expression(H5Z_token *current)
+{
+    void*         ret_value=NULL;
+    
+    FUNC_ENTER_NOAPI(H5Z_parse_expression, NULL)
+
+    H5Z_node *expr = H5Z_parse_term(current);
+
+    for (;;) {
+        H5Z_node *new_node;
+        new_node = NULL;
+
+        current = H5Z_get_token(current);
+
+        switch (current->tok_type) {
+        case PLUS:
+            new_node = H5Z_new_node(PLUS);
+
+            if (!new_node) {
+                H5Z_xform_destroy_parse_tree(expr);
+                expr = NULL;
+                HGOTO_DONE(expr)
+            }
+
+            new_node->lchild = expr;
+            new_node->rchild = H5Z_parse_term(current);
+
+            if (!new_node->rchild) {
+                H5Z_xform_destroy_parse_tree(new_node);
+                expr = NULL;
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+            }
+
+            expr = new_node;
+            break;
+        case MINUS:
+            new_node = H5Z_new_node(MINUS);
+
+            if (!new_node) {
+                H5Z_xform_destroy_parse_tree(expr);
+                expr = NULL;
+                HGOTO_DONE(expr)
+            }
+
+            new_node->lchild = expr;
+            new_node->rchild = H5Z_parse_term(current);
+
+            if (!new_node->rchild) {
+                H5Z_xform_destroy_parse_tree(new_node);
+                expr = NULL;
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+            }
+
+            expr = new_node;
+            break;
+        case RPAREN:
+            H5Z_unget_token(current);
+            HGOTO_DONE(expr)
+        case END:
+            HGOTO_DONE(expr)
+        default:
+            H5Z_xform_destroy_parse_tree(expr);
+            expr = NULL;
+            HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+        }
+    }
+
+done:
+    FUNC_LEAVE_NOAPI(expr)
+        
+
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_parse_term
+ * Purpose:     Parses a term in our expression language. A term is:
+ *
+ *                  term :=  factor | factor '*' factor | factor '/' factor
+ *
+ * Return:      Success:    Valid H5Z_node ptr to expression tree
+ *              NULLure:    NULL
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+  *              Leon Arber: Added FUNC_ENTER / FUNC_LEAVE pairs
+*
+ *-------------------------------------------------------------------------
+ */
+static H5Z_node *
+H5Z_parse_term(H5Z_token *current)
+{
+    H5Z_node *term = NULL;
+    void*         ret_value=NULL;
+   
+    FUNC_ENTER_NOAPI(H5Z_parse_term, NULL);
+    term = H5Z_parse_factor(current);
+   
+    for (;;) {
+        H5Z_node *new_node;
+        new_node = NULL;
+        
+        current = H5Z_get_token(current);
+
+        switch (current->tok_type) {
+        case MULT:
+            new_node = H5Z_new_node(MULT);
+
+            if (!new_node) {
+                H5Z_xform_destroy_parse_tree(term);
+                term = NULL;
+                HGOTO_DONE(term)
+            }
+
+            new_node->lchild = term;
+            new_node->rchild = H5Z_parse_factor(current);
+
+            if (!new_node->rchild) {
+                H5Z_xform_destroy_parse_tree(term);
+                term = NULL;
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+            }
+
+            term = new_node;
+            break;
+        case DIVIDE:
+            new_node = H5Z_new_node(DIVIDE);
+
+            if (!new_node) {
+                H5Z_xform_destroy_parse_tree(term);
+                term = NULL;
+                HGOTO_DONE(term)
+            }
+
+            new_node->lchild = term;
+            new_node->rchild = H5Z_parse_factor(current);
+            term = new_node;
+
+            if (!new_node->rchild) {
+                H5Z_xform_destroy_parse_tree(term);
+                term = NULL;
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+            }
+
+            break;
+        case RPAREN:
+            H5Z_unget_token(current);
+            HGOTO_DONE(term)
+        case END:
+            HGOTO_DONE(term)
+        default:
+            H5Z_unget_token(current);
+            HGOTO_DONE(term)
+        }
+    }
+
+done:
+  FUNC_LEAVE_NOAPI(term)
+
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_parse_factor
+ * Purpose:     Parses a factor in our expression language. A factor is:
+ *
+ *                  factor   :=  number      |  // C long or double
+ *                               symbol      |  // C identifier
+ *                               '-' factor  |  // unary minus
+ *                               '+' factor  |  // unary plus
+ *                               '(' expr ')'
+ *
+ * Return:      Success:    Valid H5Z_node ptr to expression tree
+ *              NULLure:    NULL
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+  *              Leon Arber: Added FUNC_ENTER / FUNC_LEAVE pairs
+*
+ *-------------------------------------------------------------------------
+ */
+static H5Z_node *
+H5Z_parse_factor(H5Z_token *current)
+{
+    H5Z_node 	*factor=NULL;
+    H5Z_node 	*new_node=NULL;
+    void*        ret_value=NULL;
+   
+    FUNC_ENTER_NOAPI(H5Z_parse_factor, NULL);
+    
+    current = H5Z_get_token(current);
+
+    switch (current->tok_type) {
+    case H5Z_INTEGER:
+        factor = H5Z_new_node(H5Z_INTEGER);
+
+        if (!factor)
+            HGOTO_DONE(factor)
+
+        sscanf(current->tok_begin, "%ld", &factor->value.int_val);
+        break;
+    case H5Z_FLOAT:
+        factor = H5Z_new_node(H5Z_FLOAT);
+
+        if (!factor)
+            HGOTO_DONE(factor)
+
+        sscanf(current->tok_begin, "%lf", &factor->value.float_val);
+        break;
+    case SYMBOL:
+        factor = H5Z_new_node(SYMBOL);
+
+        if (!factor)
+            HGOTO_DONE(factor)
+
+        factor->value.sym_val = HDcalloc(current->tok_end - current->tok_begin + 1, 1);
+        HDstrncpy(factor->value.sym_val, current->tok_begin,
+                current->tok_end - current->tok_begin);
+        break;
+    case LPAREN:
+        factor = H5Z_parse_expression(current);
+
+        if (!factor)
+            HGOTO_DONE(factor)
+
+        current = H5Z_get_token(current);
+
+        if (current->tok_type != RPAREN) {
+            H5Z_xform_destroy_parse_tree(factor);
+            factor = NULL;
+            HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Syntax error in data transform expression")
+        }
+
+        break;
+    case RPAREN:
+        /* We shouldn't see a ) right now */
+        H5Z_xform_destroy_parse_tree(factor);
+        factor = NULL;
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Syntax error: unexpected ')' ")
+    case PLUS:
+        /* unary + */
+        new_node = H5Z_parse_factor(current);
+
+        if (new_node) {
+            if (new_node->type != H5Z_INTEGER && new_node->type != H5Z_FLOAT &&
+                    new_node->type != SYMBOL) {
+                H5Z_xform_destroy_parse_tree(new_node);
+                H5Z_xform_destroy_parse_tree(factor);
+                factor=NULL;
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+            }
+
+            factor = new_node;
+            new_node = H5Z_new_node(PLUS);
+
+            if (!new_node) {
+                H5Z_xform_destroy_parse_tree(factor);
+                factor = NULL;
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+            }
+
+            new_node->rchild = factor;
+            factor = new_node;
+        } else {
+            H5Z_xform_destroy_parse_tree(factor);
+            factor = NULL;
+            HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+        }
+
+        break;
+    case MINUS:
+        /* unary - */
+        new_node = H5Z_parse_factor(current);
+
+        if (new_node) {
+            if (new_node->type != H5Z_INTEGER && new_node->type != H5Z_FLOAT &&
+                    new_node->type != SYMBOL) {
+                H5Z_xform_destroy_parse_tree(new_node);
+                H5Z_xform_destroy_parse_tree(factor);
+                factor = NULL;
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+            }
+
+            factor = new_node;
+            new_node = H5Z_new_node(MINUS);
+
+            if (!new_node) {
+                H5Z_xform_destroy_parse_tree(factor);
+                factor = NULL;
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+            }
+
+            new_node->rchild = factor;
+            factor = new_node;
+        } else {
+            H5Z_xform_destroy_parse_tree(factor);
+            factor = NULL;
+            HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error parsing data transform expression")
+        }
+
+        break;
+    case END:
+        HGOTO_DONE(factor)
+    }
+
+done:
+
+    FUNC_LEAVE_NOAPI(factor);
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_new_node
+ * Purpose:     Create and initilize a new H5Z_node structure.
+ * Return:      Success:    Valid H5Z_node ptr
+ *              NULLure:    NULL
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+  *              Leon Arber: Added FUNC_ENTER / FUNC_LEAVE pairs
+*
+ *-------------------------------------------------------------------------
+ */
+static H5Z_node *
+H5Z_new_node(H5Z_token_type type)
+{
+    H5Z_node* ret_value;
+    H5Z_node* new_node;
+    
+    FUNC_ENTER_NOAPI(H5Z_new_node, NULL)
+    
+    new_node = HDcalloc(1, sizeof(H5Z_node));
+ 
+    if (new_node) 
+        new_node->type = type;
+    else 
+        assert(new_node);
+
+done:
+        
+        FUNC_LEAVE_NOAPI(new_node);
+}
+
+#ifdef H5Z_XFORM_DEBUG
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_XFORM_DEBUG
+ * Purpose:     Print out the expression in a nice format which displays
+ *              the precedences explicitly with parentheses.
+ * Return:      Nothing
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+
+static void
+H5Z_XFORM_DEBUG(H5Z_node *tree)
+{
+    int i;
+    printf("Expression: ");
+    H5Z_result res;
+    res = H5Z_eval(tree);
+
+    if(res.type == H5Z_INTEGER)
+        printf("H5Z_result is: %d",res.value.int_val );
+    else if(res.type == H5Z_FLOAT)
+        printf("H5Z_result is: %f",res.value.float_val );
+    else 
+    {
+        printf("H5Z_result is ");
+        for(i=0; i<5; i++)
+            printf("%d ", array[i]);
+    }
+    printf("\n");
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_print
+ * Purpose:     Print out the expression in a nice format which displays
+ *              the precedences explicitly with parentheses.
+ * Return:      Nothing
+ * Programmer:  Bill Wendling
+ *              26. August 2003
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static void
+H5Z_print(H5Z_node *tree, FILE *stream)
+{
+    /* check args */
+    assert(stream);
+
+    if (!tree)
+        return;
+
+    if (tree->type == H5Z_INTEGER) {
+        fprintf(stream, "%ld", tree->value.int_val);
+    } else if (tree->type == H5Z_FLOAT) {
+        fprintf(stream, "%f", tree->value.float_val);
+    } else if (tree->type == SYMBOL) {
+        fprintf(stream, "%s", tree->value.sym_val);
+    } else {
+        fprintf(stream, "(");
+        H5Z_print(tree->lchild, stream);
+
+        switch (tree->type) {
+        case PLUS:      fprintf(stream, "+"); break;
+        case MINUS:     fprintf(stream, "-"); break;
+        case MULT:      fprintf(stream, "*"); break;
+        case DIVIDE:    fprintf(stream, "/"); break;
+        default: fprintf(stream, "Invalid expression tree\n");
+            return;
+        }
+
+        H5Z_print(tree->rchild, stream);
+        fprintf(stream, ")");
+    }
+}
+#endif  /* H5Z_XFORM_DEBUG */
+
+
+void H5Z_xform_eval(H5Z_node *tree, void* array, hsize_t array_size, hid_t array_type)
+{
+    unsigned int i;
+    int n;  
+    float f;
+ 
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5Z_xform_eval)
+      
+
+   if( tree->type == H5Z_INTEGER)
+   {
+           if(array_type == H5T_NATIVE_INT)
+           {
+	     n = tree->value.int_val;
+               for(i=0; i<array_size; i++)
+		 *((int*)array + i) = n;
+            
+           }
+           else if(array_type == H5T_NATIVE_FLOAT)
+           {
+               f = (float)tree->value.int_val;
+               for(i=0; i<array_size; i++)
+                   *((float*)array + i) = f;
+           }
+   }
+   else if (tree->type == H5Z_FLOAT)
+   {
+       for(i=0; i<array_size; i++)
+       {
+           if(array_type == H5T_NATIVE_INT)
+           {
+               n = (int)tree->value.float_val;
+               for(i=0; i<array_size; i++)
+		 *((int*)array + i) = n;
+                  
+           }
+           else if(array_type == H5T_NATIVE_FLOAT)
+           {
+               f = tree->value.float_val;
+               for(i=0; i<array_size; i++)
+                   *((float*)array + i) = f;
+           }
+       }
+   }
+   else
+       H5Z_eval_full(tree, array, array_size, array_type);
+
+    FUNC_LEAVE_NOAPI_VOID 
+}
+           
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_eval
+ * Return:      Nothing
+ * Programmer:  Leon Arber
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static H5Z_result
+H5Z_eval_full(H5Z_node *tree, void* array, hsize_t array_size,  hid_t array_type)
+{
+
+    H5Z_result res, resl, resr;
+    int n;
+    unsigned int i;
+    float f;
+    H5Z_result ret_value;
+    ret_value.type = ERROR;
+        
+    FUNC_ENTER_NOAPI(H5Z_eval_full, ret_value);
+    
+    /*if (!tree)
+    {
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "tree was NULL")
+    }*/
+
+    /* check args */
+    assert(tree);
+
+    if (tree->type == H5Z_INTEGER) 
+    {
+        res.type = H5Z_INTEGER;
+        res.value = tree->value;
+        HGOTO_DONE(res)
+    } 
+    else if (tree->type == H5Z_FLOAT) 
+    {
+        res.type = H5Z_FLOAT;
+        res.value = tree->value;
+        HGOTO_DONE(res)
+    } 
+    else if (tree->type == SYMBOL) 
+    {
+        res.type = SYMBOL;
+        res.value = tree->value;
+        res.ar_type = array_type;
+        HGOTO_DONE(res)
+    } 
+    else 
+    {
+        resl = H5Z_eval_full(tree->lchild, array, array_size, array_type);
+        resr = H5Z_eval_full(tree->rchild, array, array_size, array_type);
+        switch (tree->type) 
+        {
+        case PLUS:  
+           if( (resl.type == SYMBOL) && (resr.type==H5Z_INTEGER))
+            {
+                res.type = SYMBOL; 
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resr.value.int_val + *((int*)array + i);
+			*((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resr.value.int_val +*((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else if( (resl.type == SYMBOL) && (resr.type==H5Z_FLOAT)) 
+            {
+                res.type = SYMBOL;
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resr.value.float_val + *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resr.value.float_val +*((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else if( (resr.type == SYMBOL) && (resl.type==H5Z_INTEGER))
+            {
+                 res.type = SYMBOL; 
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resl.value.int_val + *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resl.value.int_val +*((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+          
+            }
+            else if( (resr.type == SYMBOL) && (resl.type==H5Z_FLOAT))
+            {
+             
+                res.type = SYMBOL;
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resl.value.float_val + *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resl.value.float_val +*((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else
+                HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, ret_value, "Unexpected type conversion operation")
+
+            HGOTO_DONE(res) 
+            break;
+        case MINUS:
+        
+           if( (resl.type == SYMBOL) && (resr.type==H5Z_INTEGER))
+            {
+                res.type = SYMBOL; 
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n =  *((int*)array + i) - resr.value.int_val;
+                        *((int*)array + i) = n;
+                        /* array[i] +=  resr.value.int_val;*/
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f =*((float*)array + i) -  resr.value.int_val;
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else if( (resl.type == SYMBOL) && (resr.type==H5Z_FLOAT)) /*we can't upgrade an array w/o allocating more memory, so we downgrade the float_val to an int.*/
+            {
+                res.type = SYMBOL;
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n =  *((int*)array + i) - resr.value.float_val;
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f =*((float*)array + i) -  resr.value.float_val; 
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else if( (resr.type == SYMBOL) && (resl.type==H5Z_INTEGER))
+            {
+                res.type = SYMBOL; 
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resl.value.int_val - *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resl.value.int_val -*((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+
+            }
+            else if( (resr.type == SYMBOL) && (resl.type==H5Z_FLOAT))
+            {
+
+                res.type = SYMBOL;
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resl.value.float_val - *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resl.value.float_val -*((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else
+                 HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, ret_value, "Unexpected type conversion operation")
+
+
+            HGOTO_DONE(res) 
+            break;
+
+
+        case MULT:
+
+           if( (resl.type == SYMBOL) && (resr.type==H5Z_INTEGER))
+            {
+                res.type = SYMBOL; 
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resr.value.int_val * *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resr.value.int_val **((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else if( (resl.type == SYMBOL) && (resr.type==H5Z_FLOAT)) 
+            {
+                res.type = SYMBOL;
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resr.value.float_val * *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resr.value.float_val **((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else if( (resr.type == SYMBOL) && (resl.type==H5Z_INTEGER))
+            {
+                res.type = SYMBOL; 
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resl.value.int_val * *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resl.value.int_val **((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+
+            }
+            else if( (resr.type == SYMBOL) && (resl.type==H5Z_FLOAT)) 
+            {
+
+                res.type = SYMBOL;
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resl.value.float_val * *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resl.value.float_val **((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else
+             HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, ret_value, "Unexpected type operation")
+
+            HGOTO_DONE(res) 
+            break;
+
+
+        case DIVIDE: 
+
+           if( (resl.type == SYMBOL) && (resr.type==H5Z_INTEGER))
+            {
+                res.type = SYMBOL; 
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = *((int*)array + i) / resr.value.int_val; 
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f =*((float*)array + i) / resr.value.int_val ;
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else if( (resl.type == SYMBOL) && (resr.type==H5Z_FLOAT)) 
+            {
+                res.type = SYMBOL;
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = *((int*)array + i) / resr.value.float_val;
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f =*((float*)array + i) / resr.value.float_val;
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else if( (resr.type == SYMBOL) && (resl.type==H5Z_INTEGER))
+            {
+                res.type = SYMBOL; 
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resl.value.int_val / *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resl.value.int_val / *((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+
+            }
+            else if( (resr.type == SYMBOL) && (resl.type==H5Z_FLOAT))
+            {
+
+                res.type = SYMBOL;
+                for(i=0; i<array_size; i++)
+                {
+                    if(array_type == H5T_NATIVE_INT)
+                    {
+                        n = resl.value.float_val / *((int*)array + i);
+                        *((int*)array + i) = n;
+                    }
+                    else if(array_type == H5T_NATIVE_FLOAT)
+                    {
+                        f = resl.value.float_val / *((float*)array + i);
+                        *((float*)array + i) = f;
+                    }
+                }
+                HGOTO_DONE(res)
+            }
+            else
+             HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, ret_value, "Unexpected type operation")
+
+            HGOTO_DONE(res) 
+            break;
+
+
+
+        default: 
+            HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, ret_value, "Invalid expression tree")
+        }
+
+    }
+
+done:
+    
+    FUNC_LEAVE_NOAPI(res)
+
+}
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_find_type
+ * Return:      Native type of datatype that is passed in
+ * Programmer:  Leon Arber, 4/20/04
+ * Modifications:
+ *                      
+ *
+ *-------------------------------------------------------------------------
+ */
+hid_t H5Z_xform_find_type(H5T_t* type)
+{
+    hid_t          ret_value = SUCCEED;
+    
+    FUNC_ENTER_NOAPI(H5Z_xform_find_type, FAIL);
+
+    assert(type);
+
+/*    H5T_NATIVE_CHAR         
+        H5T_NATIVE_SHORT        
+        H5T_NATIVE_INT          
+        H5T_NATIVE_LONG         
+        H5T_NATIVE_LLONG        
+
+        H5T_NATIVE_UCHAR
+        H5T_NATIVE_USHORT
+        H5T_NATIVE_UINT
+        H5T_NATIVE_ULONG
+        H5T_NATIVE_ULLONG
+
+        H5T_NATIVE_FLOAT
+        H5T_NATIVE_DOUBLE
+        H5T_NATIVE_LDOUBLE
+*/
+    
+    /* Check for SHORT type */
+    if((H5T_cmp(type, H5I_object_verify(H5T_NATIVE_SHORT,H5I_DATATYPE) ))==0)
+        HGOTO_DONE(H5T_NATIVE_SHORT)
+
+    /* Check for INT type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_INT,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_INT)
+
+ /* Check for LONG type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_LONG,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_LONG)
+
+ /* Check for LONGLONG type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_LLONG,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_LLONG)
+
+ /* Check for UCHAR type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_UCHAR,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_UCHAR)
+
+ /* Check for USHORT type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_USHORT,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_USHORT)
+
+ /* Check for UINT type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_UINT,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_UINT)
+
+ /* Check for ULONG type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_ULONG,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_ULONG)
+
+ /* Check for ULONGLONG type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_ULLONG,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_ULLONG)
+
+ /* Check for FLOAT type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_FLOAT,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_FLOAT)
+
+ /* Check for DOUBLE type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_DOUBLE,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_DOUBLE)
+
+
+ /* Check for LONGDOUBLE type */
+            else if((H5T_cmp(type,  H5I_object_verify(H5T_NATIVE_LDOUBLE,H5I_DATATYPE)))==0)
+        HGOTO_DONE(H5T_NATIVE_LDOUBLE)
+    else
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "could not find matching type");
+
+    
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_xform_copy_tree
+ * Purpose:     Makes a copy of the parse tree passed in.
+ * Return:      A pointer to a root for a new parse tree which is a copy
+ *              of the one passed in.
+ * Programmer:  Leon Arber
+ *              April 1, 2004.
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+void* H5Z_xform_copy_tree(H5Z_node* tree)
+{ 
+    H5Z_node* ret_value=NULL;
+
+    FUNC_ENTER_NOAPI(H5Z_xform_copy_tree, NULL)
+   
+    assert(tree);   
+
+    if(tree->type == H5Z_INTEGER)
+    {
+        if ((ret_value = (H5Z_node*) HDmalloc(sizeof(H5Z_node))) == NULL)
+            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "Ran out of memory trying to copy parse tree")
+        else
+        {
+            ret_value -> type = H5Z_INTEGER;
+            ret_value ->value.int_val = tree->value.int_val;
+        }
+    }
+    else if (tree->type == H5Z_FLOAT)
+    {   
+        if ((ret_value = (H5Z_node*) HDmalloc(sizeof(H5Z_node))) == NULL)
+            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "Ran out of memory trying to copy parse tree")
+        else
+        {   
+            ret_value -> type = H5Z_FLOAT;
+            ret_value ->value.float_val = tree->value.float_val;
+        }   
+    }
+    else if(tree->type == SYMBOL)
+    {   
+        if ((ret_value = (H5Z_node*) HDmalloc(sizeof(H5Z_node))) == NULL)
+            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "Ran out of memory trying to copy parse tree")
+        else
+        {   
+            ret_value -> type = SYMBOL;
+            if ((ret_value->value.sym_val = (char*) HDmalloc(strlen(tree->value.sym_val)+1)) == NULL)
+                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "Ran out of memory trying to copy parse tree")
+            else 
+                strcpy(ret_value ->value.sym_val, tree->value.sym_val);
+        }   
+    }   
+    else if(tree->type == MULT)
+    {
+        if ((ret_value = (H5Z_node*) HDmalloc(sizeof(H5Z_node))) == NULL)
+            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "Ran out of memory trying to copy parse tree")
+        else
+        {
+            ret_value->type = MULT;
+            ret_value->lchild = (H5Z_node*) H5Z_xform_copy_tree(tree->lchild);
+            ret_value->rchild = (H5Z_node*) H5Z_xform_copy_tree(tree->rchild);
+        }
+    }
+    else if(tree->type == PLUS)
+    {
+        if ((ret_value = (H5Z_node*) HDmalloc(sizeof(H5Z_node))) == NULL)
+            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "Ran out of memory trying to copy parse tree")
+        else
+        {
+            ret_value->type = PLUS;
+            ret_value->lchild = (H5Z_node*) H5Z_xform_copy_tree(tree->lchild);
+            ret_value->rchild = (H5Z_node*) H5Z_xform_copy_tree(tree->rchild);
+        }
+    }
+    else if(tree->type == MINUS)
+    {
+        if ((ret_value = (H5Z_node*) HDmalloc(sizeof(H5Z_node))) == NULL)
+            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "Ran out of memory trying to copy parse tree")
+        else
+        {
+            ret_value->type = MINUS;
+            ret_value->lchild = (H5Z_node*) H5Z_xform_copy_tree(tree->lchild);
+            ret_value->rchild = (H5Z_node*) H5Z_xform_copy_tree(tree->rchild);
+        }
+    }
+    else if(tree->type == DIVIDE)
+    {
+        if ((ret_value = (H5Z_node*) HDmalloc(sizeof(H5Z_node))) == NULL)
+            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "Ran out of memory trying to copy parse tree")
+        else
+        {
+            ret_value->type = DIVIDE;
+            ret_value->lchild = (H5Z_node*) H5Z_xform_copy_tree(tree->lchild);
+            ret_value->rchild = (H5Z_node*) H5Z_xform_copy_tree(tree->rchild);
+        }
+    }   
+    else
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "Error in parse tree while trying to copy")
+
+
+
+            done:
+            FUNC_LEAVE_NOAPI(ret_value)
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_xform_reduce_tree
+ * Purpose:     Simplifies parse tree passed in by performing any obvious
+ *              and trivial arithemtic calculations.
+ *
+ * Return:      None.
+ * Programmer:  Leon Arber
+ *              April 1, 2004.
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+void H5Z_xform_reduce_tree(H5Z_node* tree)
+{
+  
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5Z_xform_reduce_tree)
+ 
+        if(!tree)
+            goto done;
+
+    if((tree->type == PLUS) || (tree->type == DIVIDE) ||(tree->type == MULT) ||(tree->type == MINUS))
+    {
+        if(((tree->lchild->type == H5Z_INTEGER) || (tree->lchild->type == H5Z_FLOAT)) && ((tree->rchild->type == H5Z_INTEGER) || (tree->rchild->type == H5Z_FLOAT)))
+            H5Z_do_op(tree);
+        else
+        {
+            H5Z_xform_reduce_tree(tree->lchild);
+            if(((tree->lchild->type == H5Z_INTEGER) || (tree->lchild->type == H5Z_FLOAT)) && ((tree->rchild->type == H5Z_INTEGER) || (tree->rchild->type == H5Z_FLOAT)))
+                H5Z_do_op(tree);
+
+            H5Z_xform_reduce_tree(tree->rchild);
+            if(((tree->lchild->type == H5Z_INTEGER) || (tree->lchild->type == H5Z_FLOAT)) && ((tree->rchild->type == H5Z_INTEGER) || (tree->rchild->type == H5Z_FLOAT)))
+                H5Z_do_op(tree);
+        }
+    }
+    goto done;
+
+done:
+    FUNC_LEAVE_NOAPI_VOID;
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Z_do_op
+ * Purpose:     If the root of the tree passed in points to a simple
+ *              arithmetic operation and the left and right subtrees are both
+ *              integer or floating point values, this function does that
+ *              operation, free the left and rigt subtrees, and replaces
+ *              the root with the result of the operation.
+ * Return:      None.
+ * Programmer:  Leon Arber
+ *              April 1, 2004.
+ * Modifications:
+*
+ *-------------------------------------------------------------------------
+ */
+static void H5Z_do_op(H5Z_node* tree)
+{
+ 
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5Z_do_op)
+ 
+
+    if(tree->type == DIVIDE)
+    {
+        if((tree->lchild->type == H5Z_INTEGER) && (tree->rchild->type==H5Z_INTEGER))
+        {
+            tree->type = H5Z_INTEGER;
+            tree->value.int_val = tree->lchild->value.int_val / tree->rchild->value.int_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if((tree->lchild->type == H5Z_FLOAT) && (tree->rchild->type == H5Z_FLOAT))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.float_val / tree->rchild->value.float_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if( (tree->lchild->type == H5Z_FLOAT) && (tree->rchild->type==H5Z_INTEGER))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.float_val / tree->rchild->value.int_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if( (tree->lchild->type == H5Z_INTEGER) && (tree->rchild->type == H5Z_FLOAT))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.int_val / tree->rchild->value.float_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+
+    }
+    else if(tree->type == MULT)
+    {
+
+
+        if((tree->lchild->type == H5Z_INTEGER) && (tree->rchild->type==H5Z_INTEGER))
+        {
+            tree->type = H5Z_INTEGER;
+            tree->value.int_val = tree->lchild->value.int_val * tree->rchild->value.int_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if((tree->lchild->type == H5Z_FLOAT) && (tree->rchild->type == H5Z_FLOAT))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.float_val * tree->rchild->value.float_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if( (tree->lchild->type == H5Z_FLOAT) && (tree->rchild->type==H5Z_INTEGER))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.float_val * tree->rchild->value.int_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if( (tree->lchild->type == H5Z_INTEGER) && (tree->rchild->type == H5Z_FLOAT))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.int_val * tree->rchild->value.float_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+
+    }
+    else if(tree->type == PLUS)
+    {
+
+
+        if((tree->lchild->type == H5Z_INTEGER) && (tree->rchild->type==H5Z_INTEGER))
+        {
+            tree->type = H5Z_INTEGER;
+            tree->value.int_val = tree->lchild->value.int_val + tree->rchild->value.int_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if((tree->lchild->type == H5Z_FLOAT) && (tree->rchild->type == H5Z_FLOAT))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.float_val + tree->rchild->value.float_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if( (tree->lchild->type == H5Z_FLOAT) && (tree->rchild->type==H5Z_INTEGER))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.float_val + tree->rchild->value.int_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if( (tree->lchild->type == H5Z_INTEGER) && (tree->rchild->type == H5Z_FLOAT))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.int_val + tree->rchild->value.float_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+
+    }
+    else if(tree->type == MINUS)
+    {
+
+
+        if((tree->lchild->type == H5Z_INTEGER) && (tree->rchild->type==H5Z_INTEGER))
+        {
+            tree->type = H5Z_INTEGER;
+            tree->value.int_val = tree->lchild->value.int_val - tree->rchild->value.int_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if((tree->lchild->type == H5Z_FLOAT) && (tree->rchild->type == H5Z_FLOAT))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.float_val - tree->rchild->value.float_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if( (tree->lchild->type == H5Z_FLOAT) && (tree->rchild->type==H5Z_INTEGER))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.float_val - tree->rchild->value.int_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+        else if( (tree->lchild->type == H5Z_INTEGER) && (tree->rchild->type == H5Z_FLOAT))
+        {
+            tree->type = H5Z_FLOAT;
+            tree->value.float_val = tree->lchild->value.int_val - tree->rchild->value.float_val;
+            HDfree(tree->lchild);
+            HDfree(tree->rchild);
+            tree->lchild = NULL;
+            tree->rchild = NULL;
+        }
+    }
+ 
+    FUNC_LEAVE_NOAPI_VOID;
+              
+}
diff --git a/src/Makefile.in b/src/Makefile.in
index ab39296..c08141a 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -45,7 +45,7 @@ LIB_SRC=H5.c H5A.c H5AC.c H5B.c H5D.c H5Dio.c H5E.c H5F.c H5Fcontig.c         \
         H5Tconv.c H5Tcset.c H5Tenum.c H5Tfields.c H5Tfixed.c H5Tfloat.c       \
         H5Tinit.c H5Tnative.c H5Toffset.c H5Topaque.c H5Torder.c H5Tpad.c     \
         H5Tprecis.c H5Tstrpad.c H5Tvlen.c H5TB.c H5TS.c H5V.c H5Z.c           \
-        H5Zdeflate.c H5Zfletcher32.c H5Zshuffle.c H5Zszip.c
+        H5Zdeflate.c H5Zfletcher32.c H5Zshuffle.c H5Zszip.c H5Ztrans.c
 
 LIB_OBJ=$(LIB_SRC:.c=.lo)