[svn-r12700] Alert:

    File format is not stable, don't keep files produced!

Description:
    First stage of checkins modifying the format of groups to support creation
order.  Implement "dense" storage for links in groups.

    Try to clarify some of the symbols for the H5L API.

    Add the H5Pset_latest_format() flag for FAPLs, to choose to use the newest
file format options (including "dense" link storage in groups)

    Add the H5Pset_track_creation_order() flag for GCPLs, to enable creation
order tracking in groups (although no index on creation order yet).

    Remove --enable-group-revision configure flag, as file format issues are
now handled in a backwardly/forwardly compatible way.

    Clean up lots of compiler warnings and other minor formatting issues.

Tested on:
    FreeBSD/32 4.11 (sleipnir) w/threadsafe
    Linux/32 2.4 (heping) w/FORTRAN & C++
    Linux/64 2.4 (mir) w/enable-v1.6 compa
    Mac OSX/32 10.4.8 (amazon)
    AIX 5.3 (copper) w/parallel & FORTRAN

1 files changed, 32 insertions, 26 deletions

diff --git a/src/H5Lpublic.h b/src/H5Lpublic.h
index 2f0bf28..a351ab6 100644
--- a/src/H5Lpublic.h
+++ b/src/H5Lpublic.h
@@ -34,28 +34,34 @@
 extern "C" {
 #endif
 
-/* Link classes.
+/* Maximum length of a link's name */
+/* (encoded in a 32-bit unsigned integer) */
+#define H5L_MAX_LINK_NAME_LEN   ((uint32_t)(-1))  /* (4GB - 1) */
+
+/* Link class types.
  * Values less than 64 are reserved for the HDF5 library's internal use.
- * Values 64 to 255 are for "user-defined" link types; these types are
+ * Values 64 to 255 are for "user-defined" link class types; these types are
  * defined by HDF5 but their behavior can be overridden by users.
  * Users who want to create new classes of links should contact the HDF5
  * development team at hdfhelp@ncsa.uiuc.edu .
  * These values can never change because they appear in HDF5 files. 
  */
-typedef int H5L_link_t;
-#define H5L_LINK_ERROR    (-1)
-#define H5L_LINK_HARD     0
-#define H5L_LINK_SOFT     1
-#define H5L_LINK_BUILTIN_MAX H5L_LINK_SOFT  /* Maximum value link value for "built-in" link types */
-#define H5L_LINK_UD_MIN   64     /*link ids at or above this value are "user-defined" link types. */
-#define H5L_LINK_EXTERNAL 64
-#define H5L_LINK_MAX      255	 /*maximum link id                        */
+typedef enum {
+    H5L_TYPE_ERROR = (-1),      /* Invalid link type id         */
+    H5L_TYPE_HARD = 0,          /* Hard link id                 */
+    H5L_TYPE_SOFT = 1,          /* Soft link id                 */
+    H5L_TYPE_EXTERNAL = 64,     /* External link id             */
+    H5L_TYPE_MAX = 255	        /* Maximum link type id         */
+} H5L_type_t;
+#define H5L_TYPE_BUILTIN_MAX H5L_TYPE_SOFT      /* Maximum value link value for "built-in" link types */
+#define H5L_TYPE_UD_MIN      H5L_TYPE_EXTERNAL  /* Link ids at or above this value are "user-defined" link types. */
 
 /* Metadata buffer for user query function */
-typedef struct H5L_linkinfo_t {
+typedef struct {
     H5T_cset_t          cset;           /* Character set of link name     */
-    time_t              ctime;          /* Creation time                  */
-    H5L_link_t          linkclass;      /* Type of link                   */
+    int64_t             corder;         /* Creation order                 */
+    hbool_t             corder_valid;   /* Indicate if creation order is valid */
+    H5L_type_t          type;           /* Type of link                   */
     union {
         haddr_t         address;        /* Address hard link points to    */
         size_t          link_size;      /* Size of a soft link or UD link */
@@ -64,11 +70,11 @@ typedef struct H5L_linkinfo_t {
 
 #define H5L_SAME_LOC 0
 
-/* The H5L_link_class_t struct can be used to override the behavior of a
+/* The H5L_class_t struct can be used to override the behavior of a
  * "user-defined" link class. Users should populate the struct with callback
  * functions defined below.
  */
-/* Current version of the H5L_link_class_t struct */
+/* Current version of the H5L_class_t struct */
 #define H5L_LINK_CLASS_T_VERS (0)
 
 /* Callback prototypes for user-defined links */
@@ -78,11 +84,11 @@ typedef herr_t (*H5L_create_func_t)(const char * link_name, hid_t loc_group, voi
 /* Callback for when the link is moved */
 typedef herr_t (*H5L_move_func_t)(const char * new_name, hid_t new_loc, void * udata, size_t udata_size);
 
-/* Callback for when the link is moved */
+/* Callback for when the link is copied */
 typedef herr_t (*H5L_copy_func_t)(const char * new_name, hid_t new_loc, void * udata, size_t udata_size);
 
-/* The actual link function, called during traversal */
-typedef herr_t (*H5L_func_t)(const char * link_name, hid_t cur_group, void * udata, size_t udata_size, hid_t lapl_id);
+/* Callback during link traversal */
+typedef herr_t (*H5L_traverse_func_t)(const char * link_name, hid_t cur_group, void * udata, size_t udata_size, hid_t lapl_id);
 
 /* Callback for when the link is deleted */
 typedef herr_t (*H5L_delete_func_t)(const char * link_name, hid_t loc_group, void * udata, size_t udata_size);
@@ -92,17 +98,17 @@ typedef herr_t (*H5L_delete_func_t)(const char * link_name, hid_t loc_group, voi
 typedef ssize_t (*H5L_query_func_t)(const char * link_name, void * udata, size_t udata_size, void * buf /*out*/, size_t buf_size);
 
 /* User-defined link types */
-typedef struct H5L_link_class_t {
+typedef struct {
     int version;                    /* Version number of this struct        */
-    H5L_link_t id;                  /* Link type ID                         */
+    H5L_type_t id;                  /* Link type ID                         */
     const char *comment;            /* Comment for debugging                */
     H5L_create_func_t create_func;  /* Callback during link creation        */
     H5L_move_func_t move_func;      /* Callback after moving link           */
     H5L_copy_func_t copy_func;      /* Callback after copying link          */
-    H5L_func_t trav_func;           /* The main traversal function          */
+    H5L_traverse_func_t trav_func;  /* Callback during link traversal       */
     H5L_delete_func_t del_func;     /* Callback for link deletion           */
     H5L_query_func_t query_func;    /* Callback for queries                 */
-} H5L_link_class_t;
+} H5L_class_t;
 
 #define H5L_ELINK_PREFIX_PROP "elink_prefix"
 
@@ -127,11 +133,11 @@ H5_DLL herr_t H5Lget_linkinfo(hid_t loc_id, const char *name,
 
 /* UD link functions */
 H5_DLL herr_t H5Lcreate_ud(hid_t link_loc_id, const char *link_name,
-        H5L_link_t link_type, const void * udata, size_t udata_size,
+        H5L_type_t link_type, const void * udata, size_t udata_size,
         hid_t lcpl_id, hid_t lapl_id);
-H5_DLL herr_t H5Lregister(const H5L_link_class_t *cls);
-H5_DLL herr_t H5Lunregister(H5L_link_t id);
-H5_DLL htri_t H5Lis_registered(H5L_link_t id);
+H5_DLL herr_t H5Lregister(const H5L_class_t *cls);
+H5_DLL herr_t H5Lunregister(H5L_type_t id);
+H5_DLL htri_t H5Lis_registered(H5L_type_t id);
 
 /* External link functions */
 H5_DLL herr_t H5Lunpack_elink_val(char * ext_linkval/*in*/,