[svn-r11850] Purpose:

Feature

Description:
Added character encoding and attribute creation property lists.

Solution:
Attributes' character encoding is set via the ACPL.
The default is ASCII, with UTF-8 being the other option currently.

Platforms tested:
heping, mir, sleipnir, copper

10 files changed, 222 insertions, 45 deletions

diff --git a/src/H5A.c b/src/H5A.c
index e26e48b..e0a9681 100644
--- a/src/H5A.c
+++ b/src/H5A.c
@@ -29,7 +29,7 @@
 
 /* PRIVATE PROTOTYPES */
 static hid_t H5A_create(const H5G_loc_t *loc, const char *name,
-			const H5T_t *type, const H5S_t *space, hid_t dxpl_id);
+			const H5T_t *type, const H5S_t *space, hid_t acpl_id, hid_t dxpl_id);
 static hid_t H5A_open(H5G_loc_t *loc, unsigned idx, hid_t dxpl_id);
 static herr_t H5A_write(H5A_t *attr, const H5T_t *mem_type, const void *buf, hid_t dxpl_id);
 static herr_t H5A_read(const H5A_t *attr, const H5T_t *mem_type, void *buf, hid_t dxpl_id);
@@ -70,16 +70,45 @@ DESCRIPTION
 static herr_t
 H5A_init_interface(void)
 {
+    H5P_genclass_t  *crt_pclass;
+    size_t          nprops;                 /* Number of properties */
+    H5T_cset_t      default_cset = H5A_CHAR_ENCODING_DEF;
     herr_t ret_value = SUCCEED;   /* Return value */
 
     FUNC_ENTER_NOAPI_NOINIT(H5A_init_interface)
 
     /*
-     * Create attribute group.
+     * Create attribute ID type.
      */
     if(H5I_register_type(H5I_ATTR, (size_t)H5I_ATTRID_HASHSIZE, H5A_RESERVED_ATOMS, (H5I_free_t)H5A_close) < H5I_FILE)
         HGOTO_ERROR(H5E_INTERNAL, H5E_CANTINIT, FAIL, "unable to initialize interface")
 
+    /* =========Attribute Creation Property Class Initialization========= */
+    /* Register the default attribute creation properties */
+    assert(H5P_CLS_ATTRIBUTE_CREATE_g!=(-1));
+
+    /* Get the pointer to the attribute creation class */
+    if (NULL == (crt_pclass = H5I_object(H5P_CLS_ATTRIBUTE_CREATE_g)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list class")
+
+    /* Get the number of properties in the class */
+    if(H5P_get_nprops_pclass(crt_pclass,&nprops,FALSE)<0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "can't query number of properties")
+
+    /* Assume that if there are properties in the class, they are the default ones */
+    if(nprops==0) {
+        /* Register the size of the character encoding field */
+        if(H5P_register(crt_pclass,H5A_CHAR_ENCODING_NAME,H5A_CHAR_ENCODING_SIZE,&default_cset,NULL,NULL,NULL,NULL,NULL,NULL,NULL)<0)
+             HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
+    }
+
+    /* Only register the default property list if it hasn't been created yet */
+    if(H5P_LST_ATTRIBUTE_CREATE_g==(-1)) {
+        /* Register the default attribute creation property list */
+        if ((H5P_LST_ATTRIBUTE_CREATE_g = H5P_create_id (crt_pclass))<0)
+            HGOTO_ERROR (H5E_PLIST, H5E_CANTREGISTER, FAIL, "can't register default property list")
+    } /* end if */
+
 done:
     FUNC_LEAVE_NOAPI(ret_value)
 }
@@ -157,7 +186,7 @@ H5A_term_interface(void)
 /* ARGSUSED */
 hid_t
 H5Acreate(hid_t loc_id, const char *name, hid_t type_id, hid_t space_id,
-	  hid_t UNUSED plist_id)
+	  hid_t plist_id)
 {
     H5G_loc_t           loc;                    /* Object location */
     H5T_t		*type = NULL;
@@ -180,8 +209,8 @@ H5Acreate(hid_t loc_id, const char *name, hid_t type_id, hid_t space_id,
 	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space")
 
     /* Go do the real work for attaching the attribute to the dataset */
-    if((ret_value = H5A_create(&loc, name, type, space, H5AC_dxpl_id)) < 0)
-	HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to create attribute")
+    if ((ret_value=H5A_create(&loc, name, type, space, plist_id, H5AC_dxpl_id)) < 0)
+	HGOTO_ERROR (H5E_ATTR, H5E_CANTINIT, FAIL, "unable to create attribute")
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -199,21 +228,31 @@ done:
  *      const char *name;   IN: Name of attribute
  *      H5T_t *type;        IN: Datatype of attribute
  *      H5S_t *space;       IN: Dataspace of attribute
+ *      hid_t acpl_id       IN: Attribute creation property list
  *
  * Return: Non-negative on success/Negative on failure
  *
  * Programmer:	Quincey Koziol
  *		April 2, 1998
  *
+ * Modifications:
+ *
+ *	 Pedro Vicente, <pvn@ncsa.uiuc.edu> 22 Aug 2002
+ *	 Added a deep copy of the symbol table entry
+ *
+ *       James Laird, <jlaird@ncsa.uiuc.edu> 9 Nov 2005
+ *       Added Attribute Creation Property List
+ *
  *-------------------------------------------------------------------------
  */
 static hid_t
 H5A_create(const H5G_loc_t *loc, const char *name, const H5T_t *type,
-    const H5S_t *space, hid_t dxpl_id)
+	   const H5S_t *space, hid_t acpl_id, hid_t dxpl_id)
 {
-    H5A_t	*attr = NULL;
-    H5A_iter_cb1 cb;                    /* Iterator callback */
-    hid_t	ret_value = FAIL;
+    H5A_t	    *attr = NULL;
+    H5A_iter_cb1     cb;                    /* Iterator callback */
+    H5P_genplist_t  *ac_plist=NULL;      /* New Property list */
+    hid_t	    ret_value = FAIL;
 
     FUNC_ENTER_NOAPI_NOINIT(H5A_create)
 
@@ -239,6 +278,21 @@ H5A_create(const H5G_loc_t *loc, const char *name, const H5T_t *type,
     if((attr = H5FL_CALLOC(H5A_t)) == NULL)
         HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for attribute info")
 
+    /* If the creation property list is H5P_DEFAULT, use the default character encoding */
+    if(acpl_id == H5P_DEFAULT)
+    {
+      attr->encoding = H5A_CHAR_ENCODING_DEF;
+    }
+    else
+    {
+      /* Get a local copy of the attribute creation property list */
+      if (NULL == (ac_plist = H5I_object(acpl_id)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
+
+      if(H5P_get(ac_plist, H5A_CHAR_ENCODING_NAME, &(attr->encoding)) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get character encoding flag")
+    }
+
     /* Copy the attribute name */
     attr->name = HDstrdup(name);
 
@@ -513,7 +567,7 @@ static hid_t
 H5A_open(H5G_loc_t *loc, unsigned idx, hid_t dxpl_id)
 {
     H5A_t       *attr = NULL;
-    hid_t	    ret_value;
+    hid_t       ret_value;
 
     FUNC_ENTER_NOAPI_NOINIT(H5A_open)
 
@@ -969,6 +1023,61 @@ done:
 
 /*--------------------------------------------------------------------------
  NAME
+    H5Aget_create_plist
+ PURPOSE
+    Gets a copy of the creation property list for an attribute
+ USAGE
+    hssize_t H5Aget_create_plist (attr_id, buf_size, buf)
+        hid_t attr_id;      IN: Attribute to get name of
+ RETURNS
+    This function returns the ID of a copy of the attribute's creation
+    property list, or negative on failure.
+
+ ERRORS
+
+ DESCRIPTION
+        This function returns a copy of the creation property list for
+    an attribute.  The resulting ID must be closed with H5Pclose() or
+    resource leaks will occur.
+--------------------------------------------------------------------------*/
+hid_t
+H5Aget_create_plist(hid_t attr_id)
+{
+    H5A_t		*attr = NULL;
+    H5P_genplist_t      *plist;              /* Default property list */
+    hid_t               new_plist_id;        /* ID of ACPL to return */
+    H5P_genplist_t      *new_plist;          /* ACPL to return */
+    hid_t		ret_value;
+
+    FUNC_ENTER_API(H5Aget_create_plist, FAIL)
+    H5TRACE1("i","i",attr_id);
+
+    assert(H5P_LST_ATTRIBUTE_CREATE_g != -1);
+
+    /* Get attribute and default attribute creation property list*/
+    if (NULL==(attr=H5I_object_verify(attr_id, H5I_ATTR)))
+	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")
+    if (NULL==(plist=H5I_object(H5P_LST_ATTRIBUTE_CREATE_g)))
+        HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "can't get default ACPL")
+
+    /* Create the property list object to return */
+    if((new_plist_id=H5P_copy_plist(plist)) < 0)
+	HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "unable to copy attribute creation properties")
+    if (NULL == (new_plist = H5I_object(new_plist_id)))
+        HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "can't get property list")
+
+    /* Set the character encoding on the new property list */
+    if(H5P_set(new_plist, H5A_CHAR_ENCODING_NAME, &(attr->encoding)) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set character encoding")
+ 
+    ret_value = new_plist_id;
+
+done:
+    FUNC_LEAVE_API(ret_value)
+}
+
+/*--------------------------------------------------------------------------
+ NAME
     H5Aget_name
  PURPOSE
     Gets a copy of the name for an attribute
@@ -1587,7 +1696,7 @@ H5A_close(H5A_t *attr)
         /* Free temporary buffer */
         H5FL_BLK_FREE(attr_buf, tmp_buf);
     } /* end if */
-
+    
     /* Free dynamicly allocated items */
     if(H5A_free(attr) < 0)
         HGOTO_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't release attribute info")
diff --git a/src/H5Apkg.h b/src/H5Apkg.h
index cfe22ea..cd54ac4 100644
--- a/src/H5Apkg.h
+++ b/src/H5Apkg.h
@@ -55,6 +55,7 @@ struct H5A_t {
     size_t      ds_size;    /* Size of dataspace on disk */
     void        *data;      /* Attribute data (on a temporary basis) */
     size_t      data_size;  /* Size of data on disk */
+    H5T_cset_t  encoding;   /* Character encoding of attribute */
 };
 
 /* Declare extern the free list for H5A_t's */
diff --git a/src/H5Aprivate.h b/src/H5Aprivate.h
index 9b24490..7adbbe1 100644
--- a/src/H5Aprivate.h
+++ b/src/H5Aprivate.h
@@ -27,6 +27,11 @@
 /* Forward references of package typedefs */
 typedef struct H5A_t H5A_t;
 
+/* Attribute creation properties */
+#define H5A_CHAR_ENCODING_NAME  "character_encoding"
+#define H5A_CHAR_ENCODING_SIZE  sizeof(H5T_cset_t)
+#define H5A_CHAR_ENCODING_DEF   H5F_CRT_DEFAULT_CSET
+
 /* Library private functions in package */
 H5_DLL struct H5O_loc_t *H5A_oloc(H5A_t *attr);
 H5_DLL H5G_name_t *H5A_nameof(H5A_t *attr);
diff --git a/src/H5Apublic.h b/src/H5Apublic.h
index c7478d8..ec9904a 100644
--- a/src/H5Apublic.h
+++ b/src/H5Apublic.h
@@ -38,6 +38,7 @@ H5_DLL herr_t  H5Aread(hid_t attr_id, hid_t type_id, void *buf);
 H5_DLL herr_t  H5Aclose(hid_t attr_id);
 H5_DLL hid_t   H5Aget_space(hid_t attr_id);
 H5_DLL hid_t   H5Aget_type(hid_t attr_id);
+H5_DLL hid_t   H5Aget_create_plist(hid_t attr_id);
 H5_DLL ssize_t H5Aget_name(hid_t attr_id, size_t buf_size, char *buf);
 H5_DLL hsize_t H5Aget_storage_size(hid_t attr_id);
 H5_DLL int     H5Aget_num_attrs(hid_t loc_id);
diff --git a/src/H5Fprivate.h b/src/H5Fprivate.h
index 2359cb9..8b45ef4 100644
--- a/src/H5Fprivate.h
+++ b/src/H5Fprivate.h
@@ -323,6 +323,10 @@ typedef struct H5F_t H5F_t;
 #define H5F_CRT_SHARE_HEAD_VERS_SIZE  sizeof(unsigned)
 #define H5F_CRT_SHARE_HEAD_VERS_DEF   HDF5_SHAREDHEADER_VERSION
 
+/* File-wide default character encoding can not yet be set via the file
+ * creation property list and is always ASCII. */
+#define H5F_CRT_DEFAULT_CSET H5T_CSET_ASCII
+
 /* ========= File Access properties ============ */
 /* Definitions for the initial metadata cache resize configuration */
 #define H5F_ACS_META_CACHE_INIT_CONFIG_NAME	"mdc_initCacheCfg"
diff --git a/src/H5Oattr.c b/src/H5Oattr.c
index 406c486..5d05a7c 100644
--- a/src/H5Oattr.c
+++ b/src/H5Oattr.c
@@ -62,10 +62,13 @@ const H5O_msg_class_t H5O_MSG_ATTR[1] = {{
 }};
 
 /* This is the initial version, which does not have support for shared datatypes */
-#define H5O_ATTR_VERSION	1
+#define H5O_ATTR_VERSION_1	1
 
 /* This version allows support for shared datatypes */
-#define H5O_ATTR_VERSION_NEW	2
+#define H5O_ATTR_VERSION_2	2
+
+/* Add support for different character encodings of attribute names */
+#define H5O_ATTR_VERSION_3      3
 
 /* Flags for attribute flag encoding */
 #define H5O_ATTR_FLAG_TYPE_SHARED       0x01
@@ -104,6 +107,9 @@ H5FL_EXTERN(H5S_extent_t);
  *	Raymond Lu, 8 April 2004
  *	Changed Dataspace operation on H5S_simple_t to H5S_extent_t.
  *
+ *      James Laird, 15 November 2005
+ *      Added character encoding (version 3)
+ *
 --------------------------------------------------------------------------*/
 static void *
 H5O_attr_decode(H5F_t *f, hid_t dxpl_id, const uint8_t *p)
@@ -126,11 +132,11 @@ H5O_attr_decode(H5F_t *f, hid_t dxpl_id, const uint8_t *p)
 
     /* Version number */
     version = *p++;
-    if (version!=H5O_ATTR_VERSION && version!=H5O_ATTR_VERSION_NEW)
+    if (version<H5O_ATTR_VERSION_1 || version>H5O_ATTR_VERSION_3)
 	HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "bad version number for attribute message");
 
     /* Get the flags byte if we have a later version of the attribute */
-    if(version>H5O_ATTR_VERSION)
+    if(version>H5O_ATTR_VERSION_1)
         flags = *p++;
     else
         p++;    /* Byte is unused when version<2 */
@@ -143,10 +149,17 @@ H5O_attr_decode(H5F_t *f, hid_t dxpl_id, const uint8_t *p)
     UINT16DECODE(p, attr->dt_size);
     UINT16DECODE(p, attr->ds_size);
 
+    /*
+     * Decode the character encoding for the name for versions 3 or later,
+     * as well as some reserved bytes.
+     */
+    if(version >= H5O_ATTR_VERSION_3)
+      attr->encoding = *p++;
+
     /* Decode and store the name */
     if (NULL==(attr->name=H5MM_strdup((const char *)p)))
 	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
-    if(version < H5O_ATTR_VERSION_NEW)
+    if(version < H5O_ATTR_VERSION_2)
         p += H5O_ALIGN(name_len);    /* advance the memory pointer */
     else
         p += name_len;    /* advance the memory pointer */
@@ -170,7 +183,7 @@ H5O_attr_decode(H5F_t *f, hid_t dxpl_id, const uint8_t *p)
         if((attr->dt=(H5O_MSG_DTYPE->decode)(f,dxpl_id,p))==NULL)
             HGOTO_ERROR(H5E_ATTR, H5E_CANTDECODE, NULL, "can't decode attribute datatype");
     } /* end else */
-    if(version < H5O_ATTR_VERSION_NEW)
+    if(version < H5O_ATTR_VERSION_2)
         p += H5O_ALIGN(attr->dt_size);
     else
         p += attr->dt_size;
@@ -192,7 +205,7 @@ H5O_attr_decode(H5F_t *f, hid_t dxpl_id, const uint8_t *p)
     if(H5S_select_all(attr->ds,0)<0)
         HGOTO_ERROR (H5E_DATASPACE, H5E_CANTSET, NULL, "unable to set all selection");
 
-    if(version < H5O_ATTR_VERSION_NEW)
+    if(version < H5O_ATTR_VERSION_2)
         p += H5O_ALIGN(attr->ds_size);
     else
         p += attr->ds_size;
@@ -245,6 +258,9 @@ done:
  *	For data space, changed the operation on H5S_simple_t to
  *	H5S_extent_t
  *
+ *      James Laird, 15 November 2005
+ *      Added character encoding (version 3)
+ *
 --------------------------------------------------------------------------*/
 static herr_t
 H5O_attr_encode(H5F_t *f, uint8_t *p, const void *mesg)
@@ -269,16 +285,18 @@ H5O_attr_encode(H5F_t *f, uint8_t *p, const void *mesg)
         type_shared = FALSE;
 
     /* Check which version to write out */
-    if(type_shared)
-        version = H5O_ATTR_VERSION_NEW;  /* Write out new version if shared datatype */
+    if(attr->encoding != H5T_CSET_ASCII)
+      version = H5O_ATTR_VERSION_3;   /* Write version which includes the character encoding */
+    else if(type_shared)
+      version = H5O_ATTR_VERSION_2;   /* Write out version with shared datatype */
     else
-        version = H5O_ATTR_VERSION;
+      version = H5O_ATTR_VERSION_1;   /* Write out basic version */
 
     /* Encode Version */
     *p++ = version;
 
     /* Set attribute flags if version >1 */
-    if(version>H5O_ATTR_VERSION)
+    if(version>H5O_ATTR_VERSION_1)
         *p++ = (type_shared ? H5O_ATTR_FLAG_TYPE_SHARED : 0 );    /* Set flags for attribute */
     else
         *p++ = 0; /* Reserved, for version <2 */
@@ -294,12 +312,19 @@ H5O_attr_encode(H5F_t *f, uint8_t *p, const void *mesg)
     UINT16ENCODE(p, attr->ds_size);
 
     /*
+     * Encode the character encoding used for the attribute's name
+     * Also add several "reserved" fields to pad to 16 bytes.
+     */
+    if(version>=H5O_ATTR_VERSION_3)
+      *p++=attr->encoding;
+
+    /*
      * Write the name including null terminator padded to the correct number
      * of bytes.
      */
     HDmemcpy(p, attr->name, name_len);
     HDmemset(p+name_len, 0, H5O_ALIGN(name_len)-name_len);
-    if(version < H5O_ATTR_VERSION_NEW)
+    if(version < H5O_ATTR_VERSION_2)
         p += H5O_ALIGN(name_len);
     else
         p += name_len;
@@ -324,7 +349,7 @@ H5O_attr_encode(H5F_t *f, uint8_t *p, const void *mesg)
         if((H5O_MSG_DTYPE->encode)(f,p,attr->dt)<0)
             HGOTO_ERROR(H5E_ATTR, H5E_CANTENCODE, FAIL, "can't encode attribute datatype");
     } /* end else */
-    if(version < H5O_ATTR_VERSION_NEW) {
+    if(version < H5O_ATTR_VERSION_2) {
         HDmemset(p+attr->dt_size, 0, H5O_ALIGN(attr->dt_size)-attr->dt_size);
         p += H5O_ALIGN(attr->dt_size);
     } /* end if */
@@ -334,7 +359,7 @@ H5O_attr_encode(H5F_t *f, uint8_t *p, const void *mesg)
     /* encode the attribute dataspace */
     if((H5O_MSG_SDSPACE->encode)(f,p,&(attr->ds->extent))<0)
         HGOTO_ERROR(H5E_ATTR, H5E_CANTENCODE, FAIL, "can't encode attribute dataspace");
-    if(version < H5O_ATTR_VERSION_NEW) {
+    if(version < H5O_ATTR_VERSION_2) {
         HDmemset(p+attr->ds_size, 0, H5O_ALIGN(attr->ds_size)-attr->ds_size);
         p += H5O_ALIGN(attr->ds_size);
     } /* end if */
@@ -429,12 +454,14 @@ H5O_attr_size(const H5F_t UNUSED *f, const void *_mesg)
         type_shared = FALSE;
 
     /* Check which version to write out */
-    if(type_shared)
-        version = H5O_ATTR_VERSION_NEW;  /* Write out new version if shared datatype */
+    if(attr->encoding != H5T_CSET_ASCII)
+      version = H5O_ATTR_VERSION_3;   /* Write version which includes the character encoding */
+    else if(type_shared)
+      version = H5O_ATTR_VERSION_2;   /* Write out version with shared datatype */
     else
-        version = H5O_ATTR_VERSION;
+      version = H5O_ATTR_VERSION_1;   /* Write out basic version */
 
-    if(version < H5O_ATTR_VERSION_NEW)
+    if(version == H5O_ATTR_VERSION_1)
         ret_value = 1 +				/*version               */
                     1 +				/*reserved		*/
                     2 +				/*name size inc. null	*/
@@ -444,12 +471,23 @@ H5O_attr_size(const H5F_t UNUSED *f, const void *_mesg)
                     H5O_ALIGN(attr->dt_size) +	/*data type		*/
                     H5O_ALIGN(attr->ds_size) +	/*data space		*/
                     attr->data_size;		/*the data itself	*/
-    else
+    else if(version == H5O_ATTR_VERSION_2)
+        ret_value = 1 +				/*version               */
+                    1 +				/*flags			*/
+                    2 +				/*name size inc. null	*/
+                    2 +				/*type size		*/
+                    2 +				/*space size		*/
+                    name_len	+		/*attribute name	*/
+                    attr->dt_size +		/*data type		*/
+                    attr->ds_size +		/*data space		*/
+                    attr->data_size;		/*the data itself	*/
+    else if(version == H5O_ATTR_VERSION_3)
         ret_value = 1 +				/*version               */
                     1 +				/*flags			*/
                     2 +				/*name size inc. null	*/
                     2 +				/*type size		*/
                     2 +				/*space size		*/
+                    1 +                         /*character encoding    */
                     name_len	+		/*attribute name	*/
                     attr->dt_size +		/*data type		*/
                     attr->ds_size +		/*data space		*/
diff --git a/src/H5P.c b/src/H5P.c
index 7ac272f..e31a23e 100644
--- a/src/H5P.c
+++ b/src/H5P.c
@@ -54,6 +54,7 @@ hid_t H5P_CLS_GROUP_CREATE_g        = FAIL;
 hid_t H5P_CLS_GROUP_ACCESS_g        = FAIL;
 hid_t H5P_CLS_DATATYPE_CREATE_g     = FAIL;
 hid_t H5P_CLS_DATATYPE_ACCESS_g     = FAIL;
+hid_t H5P_CLS_ATTRIBUTE_CREATE_g     = FAIL;
 
 /*
  * Predefined property lists for each predefined class. These are initialized
@@ -70,6 +71,7 @@ hid_t H5P_LST_GROUP_CREATE_g        = FAIL;
 hid_t H5P_LST_GROUP_ACCESS_g        = FAIL;
 hid_t H5P_LST_DATATYPE_CREATE_g       = FAIL;
 hid_t H5P_LST_DATATYPE_ACCESS_g       = FAIL;
+hid_t H5P_LST_ATTRIBUTE_CREATE_g       = FAIL;
 
 /* Track the revision count of a class, to make comparisons faster */
 static unsigned H5P_next_rev=0;
@@ -403,6 +405,15 @@ H5P_init_interface(void)
     if ((H5P_CLS_DATATYPE_ACCESS_g = H5I_register (H5I_GENPROP_CLS, pclass))<0)
         HGOTO_ERROR (H5E_PLIST, H5E_CANTREGISTER, FAIL, "can't register property list class");
 
+    /* Allocate the attribute creation class */
+    assert(H5P_CLS_ATTRIBUTE_CREATE_g==(-1));
+    if (NULL==(pclass = H5P_create_class (ocrt_class,"attribute create",1,NULL,NULL,NULL,NULL,NULL,NULL)))
+        HGOTO_ERROR (H5E_PLIST, H5E_CANTINIT, FAIL, "class initialization failed");
+
+    /* Register the attribute creation class */
+    if ((H5P_CLS_ATTRIBUTE_CREATE_g = H5I_register (H5I_GENPROP_CLS, pclass))<0)
+        HGOTO_ERROR (H5E_PLIST, H5E_CANTREGISTER, FAIL, "can't register property list class");
+
 done:
     FUNC_LEAVE_NOAPI(ret_value);
 }
@@ -461,6 +472,7 @@ H5P_term_interface(void)
                         H5P_LST_GROUP_ACCESS_g =
                         H5P_LST_DATATYPE_CREATE_g =
                         H5P_LST_DATATYPE_ACCESS_g =
+                        H5P_LST_ATTRIBUTE_CREATE_g =
                         H5P_LST_MOUNT_g = (-1);
                 } /* end if */
             } /* end if */
@@ -482,6 +494,7 @@ H5P_term_interface(void)
                         H5P_CLS_GROUP_ACCESS_g =
                         H5P_CLS_DATATYPE_CREATE_g =
                         H5P_CLS_DATATYPE_ACCESS_g =
+                        H5P_CLS_ATTRIBUTE_CREATE_g =
                         H5P_CLS_MOUNT_g = (-1);
                 } /* end if */
             } /* end if */
diff --git a/src/H5Ppublic.h b/src/H5Ppublic.h
index a470dfd..bb8525b 100644
--- a/src/H5Ppublic.h
+++ b/src/H5Ppublic.h
@@ -92,6 +92,7 @@ typedef herr_t (*H5P_iterate_t)(hid_t id, const char *name, void *iter_data);
 #define H5P_GROUP_ACCESS 		(H5OPEN H5P_CLS_GROUP_ACCESS_g)
 #define H5P_DATATYPE_CREATE 		(H5OPEN H5P_CLS_DATATYPE_CREATE_g)
 #define H5P_DATATYPE_ACCESS 		(H5OPEN H5P_CLS_DATATYPE_ACCESS_g)
+#define H5P_ATTRIBUTE_CREATE 		(H5OPEN H5P_CLS_ATTRIBUTE_CREATE_g)
 H5_DLLVAR hid_t H5P_CLS_NO_CLASS_g;
 H5_DLLVAR hid_t H5P_CLS_OBJECT_CREATE_g;
 H5_DLLVAR hid_t H5P_CLS_FILE_CREATE_g;
@@ -104,6 +105,7 @@ H5_DLLVAR hid_t H5P_CLS_GROUP_CREATE_g;
 H5_DLLVAR hid_t H5P_CLS_GROUP_ACCESS_g;
 H5_DLLVAR hid_t H5P_CLS_DATATYPE_CREATE_g;
 H5_DLLVAR hid_t H5P_CLS_DATATYPE_ACCESS_g;
+H5_DLLVAR hid_t H5P_CLS_ATTRIBUTE_CREATE_g;
 
 /*
  * The library created default property lists
@@ -123,6 +125,7 @@ H5_DLLVAR hid_t H5P_CLS_DATATYPE_ACCESS_g;
 #define H5P_GROUP_ACCESS_DEFAULT 	(H5OPEN H5P_LST_GROUP_ACCESS_g)
 #define H5P_DATATYPE_CREATE_DEFAULT	(H5OPEN H5P_LST_DATATYPE_CREATE_g)
 #define H5P_DATATYPE_ACCESS_DEFAULT 	(H5OPEN H5P_LST_DATATYPE_ACCESS_g)
+#define H5P_ATTRIBUTE_CREATE_DEFAULT	(H5OPEN H5P_LST_ATTRIBUTE_CREATE_g)
 H5_DLLVAR hid_t H5P_LST_NO_CLASS_g;
 H5_DLLVAR hid_t H5P_LST_FILE_CREATE_g;
 H5_DLLVAR hid_t H5P_LST_FILE_ACCESS_g;
@@ -134,6 +137,7 @@ H5_DLLVAR hid_t H5P_LST_GROUP_CREATE_g;
 H5_DLLVAR hid_t H5P_LST_GROUP_ACCESS_g;
 H5_DLLVAR hid_t H5P_LST_DATATYPE_CREATE_g;
 H5_DLLVAR hid_t H5P_LST_DATATYPE_ACCESS_g;
+H5_DLLVAR hid_t H5P_LST_ATTRIBUTE_CREATE_g;
 
 /* Public functions */
 H5_DLL hid_t H5Pcreate_class(hid_t parent, const char *name,
@@ -339,6 +343,9 @@ H5_DLL herr_t H5Pget_link_phase_change(hid_t plist_id, unsigned *max_compact /*o
 H5_DLL herr_t H5Pset_est_link_info(hid_t plist_id, unsigned est_num_entries, unsigned est_name_len);
 H5_DLL herr_t H5Pget_est_link_info(hid_t plist_id, unsigned *est_num_entries /* out */, unsigned *est_name_len /* out */);
 
+H5_DLL herr_t H5Pset_char_encoding(hid_t plist_id, H5T_cset_t encoding);
+H5_DLL herr_t H5Pget_char_encoding(hid_t plist_id, H5T_cset_t *encoding /*out*/);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/Makefile.am b/src/Makefile.am
index bd0108e..48e86c7 100755
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -64,9 +64,8 @@ libhdf5_la_SOURCES= H5.c H5A.c H5AC.c H5B.c H5Bcache.c H5B2.c H5B2cache.c \
         H5Olink.c \
         H5Omtime.c \
         H5Oname.c H5Onull.c H5Opline.c H5Osdspace.c H5Oshared.c H5Ostab.c     \
-        H5P.c H5Pdcpl.c H5Pdxpl.c H5Pfapl.c H5Pfcpl.c H5Pgcpl.c H5Pocpl.c \
-        H5Ptest.c \
-        H5R.c H5RC.c  \
+        H5P.c H5Pacpl.c H5Pdcpl.c H5Pdxpl.c H5Pfapl.c H5Pfcpl.c H5Pgcpl.c     \
+        H5Pocpl.c H5Ptest.c H5R.c H5RC.c  \
         H5RS.c H5S.c H5Sall.c H5Shyper.c H5Smpio.c H5Snone.c H5Spoint.c       \
         H5Sselect.c H5Stest.c H5SH.c H5SHcache.c H5SHdbg.c \
         H5SL.c H5ST.c H5T.c H5Tarray.c H5Tbit.c H5Tcommit.c \
diff --git a/src/Makefile.in b/src/Makefile.in
index 92c4fa3..b67881f 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -100,15 +100,15 @@ am_libhdf5_la_OBJECTS = H5.lo H5A.lo H5AC.lo H5B.lo H5Bcache.lo \
 	H5Ocont.lo H5Odtype.lo H5Oefl.lo H5Ofill.lo H5Oginfo.lo \
 	H5Olayout.lo H5Olinfo.lo H5Olink.lo H5Omtime.lo H5Oname.lo \
 	H5Onull.lo H5Opline.lo H5Osdspace.lo H5Oshared.lo H5Ostab.lo \
-	H5P.lo H5Pdcpl.lo H5Pdxpl.lo H5Pfapl.lo H5Pfcpl.lo H5Pgcpl.lo \
-	H5Pocpl.lo H5Ptest.lo H5R.lo H5RC.lo H5RS.lo H5S.lo H5Sall.lo \
-	H5Shyper.lo H5Smpio.lo H5Snone.lo H5Spoint.lo H5Sselect.lo \
-	H5Stest.lo H5SH.lo H5SHcache.lo H5SHdbg.lo H5SL.lo H5ST.lo \
-	H5T.lo H5Tarray.lo H5Tbit.lo H5Tcommit.lo H5Tcompound.lo \
-	H5Tconv.lo H5Tcset.lo H5Tenum.lo H5Tfields.lo H5Tfixed.lo \
-	H5Tfloat.lo H5Tinit.lo H5Tnative.lo H5Toffset.lo H5Toh.lo \
-	H5Topaque.lo H5Torder.lo H5Tpad.lo H5Tprecis.lo H5Tstrpad.lo \
-	H5Tvlen.lo H5TS.lo H5V.lo H5Z.lo H5Zdeflate.lo \
+	H5P.lo H5Pacpl.lo H5Pdcpl.lo H5Pdxpl.lo H5Pfapl.lo H5Pfcpl.lo \
+	H5Pgcpl.lo H5Pocpl.lo H5Ptest.lo H5R.lo H5RC.lo H5RS.lo H5S.lo \
+	H5Sall.lo H5Shyper.lo H5Smpio.lo H5Snone.lo H5Spoint.lo \
+	H5Sselect.lo H5Stest.lo H5SH.lo H5SHcache.lo H5SHdbg.lo \
+	H5SL.lo H5ST.lo H5T.lo H5Tarray.lo H5Tbit.lo H5Tcommit.lo \
+	H5Tcompound.lo H5Tconv.lo H5Tcset.lo H5Tenum.lo H5Tfields.lo \
+	H5Tfixed.lo H5Tfloat.lo H5Tinit.lo H5Tnative.lo H5Toffset.lo \
+	H5Toh.lo H5Topaque.lo H5Torder.lo H5Tpad.lo H5Tprecis.lo \
+	H5Tstrpad.lo H5Tvlen.lo H5TS.lo H5V.lo H5Z.lo H5Zdeflate.lo \
 	H5Zfletcher32.lo H5Znbit.lo H5Zshuffle.lo H5Zszip.lo \
 	H5Zscaleoffset.lo H5Ztrans.lo
 libhdf5_la_OBJECTS = $(am_libhdf5_la_OBJECTS)
@@ -418,9 +418,8 @@ libhdf5_la_SOURCES = H5.c H5A.c H5AC.c H5B.c H5Bcache.c H5B2.c H5B2cache.c \
         H5Olink.c \
         H5Omtime.c \
         H5Oname.c H5Onull.c H5Opline.c H5Osdspace.c H5Oshared.c H5Ostab.c     \
-        H5P.c H5Pdcpl.c H5Pdxpl.c H5Pfapl.c H5Pfcpl.c H5Pgcpl.c H5Pocpl.c \
-        H5Ptest.c \
-        H5R.c H5RC.c  \
+        H5P.c H5Pacpl.c H5Pdcpl.c H5Pdxpl.c H5Pfapl.c H5Pfcpl.c H5Pgcpl.c     \
+        H5Pocpl.c H5Ptest.c H5R.c H5RC.c  \
         H5RS.c H5S.c H5Sall.c H5Shyper.c H5Smpio.c H5Snone.c H5Spoint.c       \
         H5Sselect.c H5Stest.c H5SH.c H5SHcache.c H5SHdbg.c \
         H5SL.c H5ST.c H5T.c H5Tarray.c H5Tbit.c H5Tcommit.c \
@@ -657,6 +656,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Oshared.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Ostab.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5P.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pacpl.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pdcpl.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pdxpl.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pfapl.Plo@am__quote@