[svn-r12528] Added User-Defined links to the library.

Users can create external links using H5L_create_external().  These links
point to an object in another HDF5 file.  Users can alter the behavior of
external links or create new kinds of links by registering callbacks
using the H5L interface.

Added tests, tools support, etc.

Also a number of other, minor changes have been made (some restructuring of
the H5L interface, for instance).

Additional documentation and examples are forthcoming.

2 files changed, 60 insertions, 286 deletions

diff --git a/tools/h5jam/h5jam.c b/tools/h5jam/h5jam.c
index 5e4d885..afa9ffa 100644
--- a/tools/h5jam/h5jam.c
+++ b/tools/h5jam/h5jam.c
@@ -15,7 +15,6 @@
 #include <stdio.h>
 #include <fcntl.h>
 #include <sys/stat.h>
-
 #ifdef H5_HAVE_UNISTD_H
 #include <unistd.h>
 #endif
diff --git a/tools/h5jam/h5jamgentest.c b/tools/h5jam/h5jamgentest.c
index a3a99ca..dd80c29 100644
--- a/tools/h5jam/h5jamgentest.c
+++ b/tools/h5jam/h5jamgentest.c
@@ -65,6 +65,8 @@ char pattern[11] = "abcdefghij";
  */
 
 
+#define BUF_SIZE 1024
+
 #define LENSTR  50
 #define LENSTR2  11
 
@@ -118,158 +120,63 @@ typedef struct s1_t {
 /* VL string datatype name */
 #define VLSTR_TYPE      "vl_string_type"
 
+/* A UD link traversal function.  Shouldn't actually be called. */
+static hid_t UD_traverse(const char * link_name, hid_t cur_group, void * udata, size_t udata_size, hid_t lapl_id)
+{
+return -1;
+}
+#define MY_LINKCLASS 187
+const H5L_link_class_t UD_link_class[1] = {{
+    H5L_LINK_CLASS_T_VERS,    /* H5L_link_class_t version       */
+    MY_LINKCLASS,             /* Link type id number            */
+    "UD link class",          /* name for debugging             */
+    NULL,                     /* Creation callback              */
+    NULL,                     /* Move/rename callback           */
+    UD_traverse,              /* The actual traversal function  */
+    NULL,                     /* Deletion callback              */
+    NULL                      /* Query callback                 */
+}};
+
 
-/*
+
+/* gent_ub
+    with no ub, identical to gent_all from h5dumpgentest.c
+
+    FILENAME is the name of the file to create
+    UB_SIZE is the size the buffer should be
+    UB_FILL characters will be set to the PATTERN array,
+        the rest of the user block will be NULL.
 
 / : g1  g2  attr1  attr2
 g1 : g1.1  g1.2
 g1.1 : dset1.1.1(attr1, attr2)   dset1.1.2
-g1.2 : g1.2.1
+g1.2 : g1.2.1 extlink
 g1.2.1 : slink
-g2 : dset2.1  dset2.2
+g2 : dset2.1  dset2.2 udlink
 
 */
 
-
-static void gent_all(void) {
-hid_t fid, group, attr, dataset, space;
-hsize_t dims[2];
-int data[2][2], dset1[10][10], dset2[20];
-char buf[60];
-int i, j;
-float dset2_1[10], dset2_2[3][5];
-
-  fid = H5Fcreate(FILE7, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
-
-  /* create groups */
-  group = H5Gcreate (fid, "/g1", 0);
-  H5Gclose(group);
-
-  group = H5Gcreate (fid, "/g2", 0);
-  H5Gclose(group);
-
-  group = H5Gcreate (fid, "/g1/g1.1", 0);
-  H5Gclose(group);
-
-  group = H5Gcreate (fid, "/g1/g1.2", 0);
-  H5Gclose(group);
-
-  group = H5Gcreate (fid, "/g1/g1.2/g1.2.1", 0);
-  H5Gclose(group);
-
-  /* root attributes */
-  group = H5Gopen (fid, "/");
-
-  dims[0] = 10;
-  space = H5Screate_simple(1, dims, NULL);
-  attr = H5Acreate (group, "attr1", H5T_STD_I8BE, space, H5P_DEFAULT);
-  sprintf(buf, "abcdefghi");
-  H5Awrite(attr, H5T_NATIVE_SCHAR, buf);
-  H5Sclose(space);
-  H5Aclose(attr);
-
-  dims[0] = 2; dims[1] = 2;
-  space = H5Screate_simple(2, dims, NULL);
-  attr = H5Acreate (group, "attr2", H5T_STD_I32BE, space, H5P_DEFAULT);
-  data[0][0] = 0; data[0][1] = 1; data[1][0] = 2; data[1][1] = 3;
-  H5Awrite(attr, H5T_NATIVE_INT, data);
-  H5Sclose(space);
-  H5Aclose(attr);
-
-  H5Gclose(group);
-
-  group = H5Gopen (fid, "/g1/g1.1");
-
-  /* dset1.1.1 */
-  dims[0] = 10; dims[1] = 10;
-  space = H5Screate_simple(2, dims, NULL);
-  dataset = H5Dcreate(group, "dset1.1.1", H5T_STD_I32BE, space, H5P_DEFAULT);
-  for (i = 0; i < 10; i++)
-       for (j = 0; j < 10; j++)
-            dset1[i][j] = j*i;
-  H5Dwrite(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset1);
-  H5Sclose(space);
-
-  /* attributes of dset1.1.1 */
-  dims[0] = 27;
-  space = H5Screate_simple(1, dims, NULL);
-  attr = H5Acreate (dataset, "attr1", H5T_STD_I8BE, space, H5P_DEFAULT);
-  sprintf(buf, "1st attribute of dset1.1.1");
-  H5Awrite(attr, H5T_NATIVE_SCHAR, buf);
-  H5Sclose(space);
-  H5Aclose(attr);
-
-  dims[0] = 27;
-  space = H5Screate_simple(1, dims, NULL);
-  attr = H5Acreate (dataset, "attr2", H5T_STD_I8BE, space, H5P_DEFAULT);
-  sprintf(buf, "2nd attribute of dset1.1.1");
-  H5Awrite(attr, H5T_NATIVE_SCHAR, buf);
-  H5Sclose(space);
-  H5Aclose(attr);
-
-  H5Dclose(dataset);
-
-  /* dset1.1.2 */
-  dims[0] = 20;
-  space = H5Screate_simple(1, dims, NULL);
-  dataset = H5Dcreate(group, "dset1.1.2", H5T_STD_I32BE, space, H5P_DEFAULT);
-  for (i = 0; i < 20; i++)
-       dset2[i] = i;
-  H5Dwrite(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset2);
-  H5Sclose(space);
-  H5Dclose(dataset);
-
-  H5Gclose(group);
-
-  /* soft link */
-  group = H5Gopen (fid, "/g1/g1.2/g1.2.1");
-  H5Glink (group, H5G_LINK_SOFT, "somevalue", "slink");
-  H5Gclose(group);
-
-  group = H5Gopen (fid, "/g2");
-
-  /* dset2.1 */
-  dims[0] = 10;
-  space = H5Screate_simple(1, dims, NULL);
-  dataset = H5Dcreate(group, "dset2.1", H5T_IEEE_F32BE, space, H5P_DEFAULT);
-  for (i = 0; i < 10; i++)
-       dset2_1[i] = (float)(i*0.1+1);
-  H5Dwrite(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset2_1);
-  H5Sclose(space);
-  H5Dclose(dataset);
-
-  /* dset2.2 */
-  dims[0] = 3; dims[1] = 5;
-  space = H5Screate_simple(2, dims, NULL);
-  dataset = H5Dcreate(group, "dset2.2", H5T_IEEE_F32BE, space, H5P_DEFAULT);
-  for (i = 0; i < 3; i++)
-       for (j = 0; j < 5; j++)
-            dset2_2[i][j] = (float)((i+1)*j*0.1);
-  H5Dwrite(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset2_2);
-  H5Sclose(space);
-  H5Dclose(dataset);
-
-  H5Gclose(group);
-
-  H5Fclose(fid);
-
-}
-
-static void gent_withub(void) {
+static void gent_ub(const char * filename, int ub_size, int ub_fill) {
 hid_t fid, group, attr, dataset, space;
 hid_t create_plist;
 hsize_t dims[2];
 int data[2][2], dset1[10][10], dset2[20];
-char buf[512];
+char buf[BUF_SIZE];
 int i, j;
-unsigned u;
 float dset2_1[10], dset2_2[3][5];
 int fd;
 char *bp;
 
-  create_plist = H5Pcreate(H5P_FILE_CREATE);
-  H5Pset_userblock(create_plist,(hsize_t)512);
-  fid = H5Fcreate(FILE8, H5F_ACC_TRUNC, create_plist, H5P_DEFAULT);
+  if(ub_size > 0)
+  {
+      create_plist = H5Pcreate(H5P_FILE_CREATE);
+      H5Pset_userblock(create_plist,(hsize_t)ub_size);
+      fid = H5Fcreate(filename, H5F_ACC_TRUNC, create_plist, H5P_DEFAULT);
+  }
+  else
+  {
+      fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+  }
 
   /* create groups */
   group = H5Gcreate (fid, "/g1", 0);
@@ -351,153 +258,12 @@ char *bp;
 
   H5Gclose(group);
 
-  /* soft link */
-  group = H5Gopen (fid, "/g1/g1.2/g1.2.1");
-  H5Glink (group, H5G_LINK_SOFT, "somevalue", "slink");
-  H5Gclose(group);
-
-  group = H5Gopen (fid, "/g2");
-
-  /* dset2.1 */
-  dims[0] = 10;
-  space = H5Screate_simple(1, dims, NULL);
-  dataset = H5Dcreate(group, "dset2.1", H5T_IEEE_F32BE, space, H5P_DEFAULT);
-  for (i = 0; i < 10; i++)
-       dset2_1[i] = (float)(i*0.1+1);
-  H5Dwrite(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset2_1);
-  H5Sclose(space);
-  H5Dclose(dataset);
-
-  /* dset2.2 */
-  dims[0] = 3; dims[1] = 5;
-  space = H5Screate_simple(2, dims, NULL);
-  dataset = H5Dcreate(group, "dset2.2", H5T_IEEE_F32BE, space, H5P_DEFAULT);
-  for (i = 0; i < 3; i++)
-       for (j = 0; j < 5; j++)
-            dset2_2[i][j] = (float)((i+1)*j*0.1);
-  H5Dwrite(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset2_2);
-  H5Sclose(space);
-  H5Dclose(dataset);
-
-  H5Gclose(group);
-
-  H5Fclose(fid);
-
-
-	fd = HDopen(FILE8,O_RDWR, 0);
-	if (fd < 0) {
-		/* panic */
-	}
-	/* fill buf with pattern */
-	memset(buf,'\0',512);
-	bp = buf;
-	for (u = 0; u < strlen(pattern); u++) {
-		*bp++ = pattern[u%10];
-	}
-
-	HDwrite(fd,buf,512);
-
-	close(fd);
-}
-
-static void gent_withub513(void) {
-hid_t fid, group, attr, dataset, space;
-hid_t create_plist;
-hsize_t dims[2];
-int data[2][2], dset1[10][10], dset2[20];
-char buf[1023];
-int i, j;
-float dset2_1[10], dset2_2[3][5];
-int fd;
-char *bp;
-
-  create_plist = H5Pcreate(H5P_FILE_CREATE);
-  H5Pset_userblock(create_plist,(hsize_t)1024);
-  fid = H5Fcreate(FILE9, H5F_ACC_TRUNC, create_plist, H5P_DEFAULT);
-
-  /* create groups */
-  group = H5Gcreate (fid, "/g1", 0);
-  H5Gclose(group);
-
-  group = H5Gcreate (fid, "/g2", 0);
-  H5Gclose(group);
-
-  group = H5Gcreate (fid, "/g1/g1.1", 0);
-  H5Gclose(group);
-
-  group = H5Gcreate (fid, "/g1/g1.2", 0);
-  H5Gclose(group);
-
-  group = H5Gcreate (fid, "/g1/g1.2/g1.2.1", 0);
-  H5Gclose(group);
-
-  /* root attributes */
-  group = H5Gopen (fid, "/");
-
-  dims[0] = 10;
-  space = H5Screate_simple(1, dims, NULL);
-  attr = H5Acreate (group, "attr1", H5T_STD_I8BE, space, H5P_DEFAULT);
-  sprintf(buf, "abcdefghi");
-  H5Awrite(attr, H5T_NATIVE_SCHAR, buf);
-  H5Sclose(space);
-  H5Aclose(attr);
-
-  dims[0] = 2; dims[1] = 2;
-  space = H5Screate_simple(2, dims, NULL);
-  attr = H5Acreate (group, "attr2", H5T_STD_I32BE, space, H5P_DEFAULT);
-  data[0][0] = 0; data[0][1] = 1; data[1][0] = 2; data[1][1] = 3;
-  H5Awrite(attr, H5T_NATIVE_INT, data);
-  H5Sclose(space);
-  H5Aclose(attr);
-
-  H5Gclose(group);
-
-  group = H5Gopen (fid, "/g1/g1.1");
-
-  /* dset1.1.1 */
-  dims[0] = 10; dims[1] = 10;
-  space = H5Screate_simple(2, dims, NULL);
-  dataset = H5Dcreate(group, "dset1.1.1", H5T_STD_I32BE, space, H5P_DEFAULT);
-  for (i = 0; i < 10; i++)
-       for (j = 0; j < 10; j++)
-            dset1[i][j] = j*i;
-  H5Dwrite(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset1);
-  H5Sclose(space);
-
-  /* attributes of dset1.1.1 */
-  dims[0] = 27;
-  space = H5Screate_simple(1, dims, NULL);
-  attr = H5Acreate (dataset, "attr1", H5T_STD_I8BE, space, H5P_DEFAULT);
-  sprintf(buf, "1st attribute of dset1.1.1");
-  H5Awrite(attr, H5T_NATIVE_SCHAR, buf);
-  H5Sclose(space);
-  H5Aclose(attr);
-
-  dims[0] = 27;
-  space = H5Screate_simple(1, dims, NULL);
-  attr = H5Acreate (dataset, "attr2", H5T_STD_I8BE, space, H5P_DEFAULT);
-  sprintf(buf, "2nd attribute of dset1.1.1");
-  H5Awrite(attr, H5T_NATIVE_SCHAR, buf);
-  H5Sclose(space);
-  H5Aclose(attr);
-
-  H5Dclose(dataset);
-
-  /* dset1.1.2 */
-  dims[0] = 20;
-  space = H5Screate_simple(1, dims, NULL);
-  dataset = H5Dcreate(group, "dset1.1.2", H5T_STD_I32BE, space, H5P_DEFAULT);
-  for (i = 0; i < 20; i++)
-       dset2[i] = i;
-  H5Dwrite(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset2);
-  H5Sclose(space);
-  H5Dclose(dataset);
-
-  H5Gclose(group);
+  /* external link */
+  H5Lcreate_external("somefile", "somepath", fid, "/g1/g1.2/extlink", H5P_DEFAULT, H5P_DEFAULT);
 
   /* soft link */
   group = H5Gopen (fid, "/g1/g1.2/g1.2.1");
-  H5Glink (group, H5G_LINK_SOFT, "somevalue", "slink");
+  H5Glink (group, H5L_LINK_SOFT, "somevalue", "slink");
   H5Gclose(group);
 
   group = H5Gopen (fid, "/g2");
@@ -525,23 +291,32 @@ char *bp;
 
   H5Gclose(group);
 
+  /* user-defined link */
+  H5Lregister(UD_link_class);
+  H5Lcreate_ud(fid, "/g2/udlink", MY_LINKCLASS, NULL, 0, H5P_DEFAULT, H5P_DEFAULT);
+
   H5Fclose(fid);
 
+  /* If a user block is being used, write to it here */
+  if(ub_size > 0)
+  {
+        HDassert(ub_size < BUF_SIZE);
 
-	fd = HDopen(FILE9,O_RDWR, 0);
+	fd = HDopen(filename,O_RDWR, 0);
 	if (fd < 0) {
 		/* panic */
 	}
 	/* fill buf with pattern */
-	memset(buf,'\0',1024);
+	memset(buf,'\0',ub_size);
 	bp = buf;
-	for (i = 0; i < 513; i++) {
+	for (i = 0; i < ub_fill; i++) {
 		*bp++ = pattern[i%10];
 	}
 
-	HDwrite(fd,buf,1024);
+	HDwrite(fd,buf,ub_size);
 
 	close(fd);
+  }
 }
 
 static void
@@ -636,9 +411,9 @@ create_binfile(UBBIN4,512);
 create_binfile(UBBIN5,513);
 
 */
-    gent_all();
-    gent_withub();
-    gent_withub513();
+    gent_ub(FILE7, 0, 0);
+    gent_ub(FILE8, 512, strlen(pattern));
+    gent_ub(FILE9, 1024, 513);
 
     return 0;
 }