[svn-r13470] Description:

	Avoid storing the phase change values for attribute storage, unless
they are non-default values.

Tested on:
	Mac OS X/32 10.4.8 (amazon)

5 files changed, 30 insertions, 11 deletions

diff --git a/src/H5O.c b/src/H5O.c
index 52610cf..48ee26e 100644
--- a/src/H5O.c
+++ b/src/H5O.c
@@ -686,6 +686,8 @@ H5O_create(H5F_t *f, hid_t dxpl_id, size_t size_hint, hid_t ocpl_id,
         oh->corder_bt2_addr = HADDR_UNDEF;
 
         /* Check for non-default attribute storage phase change values */
+        if(oh->max_compact != H5O_CRT_ATTR_MAX_COMPACT_DEF || oh->min_dense != H5O_CRT_ATTR_MIN_DENSE_DEF)
+            oh->flags |= H5O_HDR_ATTR_STORE_PHASE_CHANGE;
     } /* end if */
     else {
         /* Flags */
diff --git a/src/H5Ocache.c b/src/H5Ocache.c
index 7d096d5..c4430e6 100644
--- a/src/H5Ocache.c
+++ b/src/H5Ocache.c
@@ -49,7 +49,7 @@
 #define H5O_SPEC_READ_SIZE 512
 
 /* All the object header status flags that this version of the library knows about */
-#define H5O_HDR_ALL_FLAGS       (H5O_HDR_ATTR_CRT_ORDER_TRACKED | H5O_HDR_ATTR_CRT_ORDER_INDEXED | H5O_HDR_STORE_TIMES)
+#define H5O_HDR_ALL_FLAGS       (H5O_HDR_ATTR_CRT_ORDER_TRACKED | H5O_HDR_ATTR_CRT_ORDER_INDEXED | H5O_HDR_ATTR_STORE_PHASE_CHANGE | H5O_HDR_STORE_TIMES)
 
 
 /******************/
@@ -314,8 +314,14 @@ H5O_load(H5F_t *f, hid_t dxpl_id, haddr_t addr, const void UNUSED * _udata1,
             oh->atime = oh->mtime = oh->ctime = oh->btime = 0;
 
         /* Attribute fields */
-        UINT16DECODE(p, oh->max_compact);
-        UINT16DECODE(p, oh->min_dense);
+        if(oh->flags & H5O_HDR_ATTR_STORE_PHASE_CHANGE) {
+            UINT16DECODE(p, oh->max_compact);
+            UINT16DECODE(p, oh->min_dense);
+        } /* end if */
+        else {
+            oh->max_compact = H5O_CRT_ATTR_MAX_COMPACT_DEF;
+            oh->min_dense = H5O_CRT_ATTR_MIN_DENSE_DEF;
+        } /* end else */
         H5F_DECODE_LENGTH(f, p, oh->nattrs);
         H5F_addr_decode(f, &p, &(oh->attr_fheap_addr));
         H5F_addr_decode(f, &p, &(oh->name_bt2_addr));
@@ -661,8 +667,10 @@ H5O_assert(oh);
             } /* end if */
 
             /* Attribute fields */
-            UINT16ENCODE(p, oh->max_compact);
-            UINT16ENCODE(p, oh->min_dense);
+            if(oh->flags & H5O_HDR_ATTR_STORE_PHASE_CHANGE) {
+                UINT16ENCODE(p, oh->max_compact);
+                UINT16ENCODE(p, oh->min_dense);
+            } /* end if */
             H5F_ENCODE_LENGTH(f, p, oh->nattrs);
             H5F_addr_encode(f, &p, oh->attr_fheap_addr);
             H5F_addr_encode(f, &p, oh->name_bt2_addr);
diff --git a/src/H5Opkg.h b/src/H5Opkg.h
index d8a6fd2..e3626fe 100644
--- a/src/H5Opkg.h
+++ b/src/H5Opkg.h
@@ -78,7 +78,15 @@
 /* Size of checksum (on disk) */
 #define H5O_SIZEOF_CHKSUM               4
 
-/* Default value for object header status flags */
+/* ========= Object Creation properties ============ */
+/* Default values for some of the object creation properties */
+/* NOTE: The H5O_CRT_ATTR_MAX_COMPACT_DEF & H5O_CRT_ATTR_MIN_DENSE_DEF values
+ *      are "built into" the file format, make certain existing files with
+ *      default attribute phase change storage are handled correctly if they
+ *      are changed.
+ */
+#define H5O_CRT_ATTR_MAX_COMPACT_DEF    8
+#define H5O_CRT_ATTR_MIN_DENSE_DEF      6
 #define H5O_CRT_OHDR_FLAGS_DEF          H5O_HDR_STORE_TIMES
 
 /*
@@ -104,8 +112,10 @@
                   4 +		/*change time		*/		      \
                   4		/*birth time		*/		      \
                 ) : 0) +						      \
-                2 +		/*max compact attributes */		      \
-                2 +		/*min dense attributes	*/		      \
+                (((O)->flags & H5O_HDR_ATTR_STORE_PHASE_CHANGE) ? (	      \
+                  2 +		/*max compact attributes */		      \
+                  2		/*min dense attributes	*/		      \
+                ) : 0) +						      \
                 (O)->sizeof_size + /*# of attributes	*/		      \
                 (O)->sizeof_addr + /*addr of attribute heap */		      \
                 (O)->sizeof_addr + /*addr of attribute name index */	      \
diff --git a/src/H5Opublic.h b/src/H5Opublic.h
index 0e64a93..73c4581 100644
--- a/src/H5Opublic.h
+++ b/src/H5Opublic.h
@@ -63,7 +63,8 @@
 /* Object header status flag definitions */
 #define H5O_HDR_ATTR_CRT_ORDER_TRACKED  0x01    /* Attribute creation order is tracked */
 #define H5O_HDR_ATTR_CRT_ORDER_INDEXED  0x02    /* Attribute creation order has index */
-#define H5O_HDR_STORE_TIMES             0x04    /* Store access, modification, change & birth times for object */
+#define H5O_HDR_ATTR_STORE_PHASE_CHANGE 0x04    /* Non-default attribute storage phase change values stored */
+#define H5O_HDR_STORE_TIMES             0x08    /* Store access, modification, change & birth times for object */
 
 /* Maximum shared message values.  Number of indexes is 8 to allow room to add
  * new types of messages.
diff --git a/src/H5Pocpl.c b/src/H5Pocpl.c
index 974a6a0..726e41d 100755
--- a/src/H5Pocpl.c
+++ b/src/H5Pocpl.c
@@ -48,10 +48,8 @@
 /* ========= Object Creation properties ============ */
 /* Definitions for the max. # of attributes to store compactly */
 #define H5O_CRT_ATTR_MAX_COMPACT_SIZE   sizeof(unsigned)
-#define H5O_CRT_ATTR_MAX_COMPACT_DEF    8
 /* Definitions for the min. # of attributes to store densely */
 #define H5O_CRT_ATTR_MIN_DENSE_SIZE     sizeof(unsigned)
-#define H5O_CRT_ATTR_MIN_DENSE_DEF      6
 /* Definitions for object header flags */
 #define H5O_CRT_OHDR_FLAGS_SIZE         sizeof(uint8_t)