/*------------------------------------------------------------------------- * Copyright (C) 1997 National Center for Supercomputing Applications. * All rights reserved. * *------------------------------------------------------------------------- * * Created: H5G.c * Jul 18 1997 * Robb Matzke * * Purpose: Symbol table functions. The functions that begin with * `H5G_stab_' don't understand the naming system; they operate * on a single symbol table at a time. * * The functions that begin with `H5G_node_' operate on the leaf * nodes of a symbol table B-tree. They should be defined in * the H5Gnode.c file. * * The remaining functions know how to traverse the group * directed graph. * * Names: Object names are a slash-separated list of components. If * the name begins with a slash then it's absolute, otherwise * it's relative ("/foo/bar" is absolute while "foo/bar" is * relative). Multiple consecutive slashes are treated as * single slashes and trailing slashes are ignored. The special * case `/' is the root group. Every file has a root group. * * API functions that look up names take a location ID and a * name. The location ID can be a file ID or a group ID and the * name can be relative or absolute. * * +--------------+----------- +--------------------------------+ * | Location ID | Name | Meaning | * +--------------+------------+--------------------------------+ * | File ID | "/foo/bar" | Find `foo' within `bar' within | * | | | the root group of the specified| * | | | file. | * +--------------+------------+--------------------------------+ * | File ID | "foo/bar" | Find `foo' within `bar' within | * | | | the current working group of | * | | | the specified file. | * +--------------+------------+--------------------------------+ * | File ID | "/" | The root group of the specified| * | | | file. | * +--------------+------------+--------------------------------+ * | File ID | "." | The current working group of | * | | | the specified file. | * +--------------+------------+--------------------------------+ * | Group ID | "/foo/bar" | Find `foo' within `bar' within | * | | | the root group of the file | * | | | containing the specified group.| * +--------------+------------+--------------------------------+ * | Group ID | "foo/bar" | File `foo' within `bar' within | * | | | the specified group. | * +--------------+------------+--------------------------------+ * | Group ID | "/" | The root group of the file | * | | | containing the specified group.| * +--------------+------------+--------------------------------+ * | Group ID | "." | The specified group. | * +--------------+------------+--------------------------------+ * * * Modifications: * * Robb Matzke, 5 Aug 1997 * Added calls to H5E. * * Robb Matzke, 30 Aug 1997 * Added `Errors:' field to function prologues. * *------------------------------------------------------------------------- */ #define H5G_PACKAGE /*suppress error message about including H5Gpkg.h */ /* Packages needed by this file... */ #include #include #include #include #include #include #include #include #define H5G_INIT_HEAP 8192 #define H5G_RESERVED_ATOMS 0 #define PABLO_MASK H5G_mask /* Interface initialization */ static hbool_t interface_initialize_g = FALSE; #define INTERFACE_INIT H5G_init_interface static herr_t H5G_init_interface(void); static void H5G_term_interface(void); /*------------------------------------------------------------------------- * Function: H5Gcreate * * Purpose: Creates a new group relative to LOC_ID and gives it the * specified NAME. The group is opened for write access * and it's object ID is returned. * * The optional SIZE_HINT specifies how much file space to * reserve to store the names that will appear in this * group. If a non-positive value is supplied for the SIZE_HINT * then a default size is chosen. * * See also: H5Gset(), H5Gpush(), H5Gpop() * * Errors: * * Return: Success: The object ID of a new, empty group open for * writing. Call H5Gclose() when finished with * the group. * * Failure: FAIL * * Programmer: Robb Matzke * Wednesday, September 24, 1997 * * Modifications: * *------------------------------------------------------------------------- */ hid_t H5Gcreate(hid_t loc_id, const char *name, size_t size_hint) { H5G_t *loc = NULL; H5G_t *grp = NULL; hid_t ret_value = FAIL; FUNC_ENTER(H5Gcreate, FAIL); /* Check arguments */ if (NULL==(loc=H5G_loc (loc_id))) { HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a location"); } if (!name || !*name) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name given"); } /* Create the group */ if (NULL == (grp = H5G_create(loc, name, size_hint))) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group"); } if ((ret_value = H5I_register(H5_GROUP, grp)) < 0) { H5G_close(grp); HRETURN_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register group"); } FUNC_LEAVE(ret_value); } /*------------------------------------------------------------------------- * Function: H5Gopen * * Purpose: Opens an existing group for modification. When finished, * call H5Gclose() to close it and release resources. * * Errors: * * Return: Success: Object ID of the group. * * Failure: FAIL * * Programmer: Robb Matzke * Wednesday, December 31, 1997 * * Modifications: * *------------------------------------------------------------------------- */ hid_t H5Gopen(hid_t loc_id, const char *name) { hid_t ret_value = FAIL; H5G_t *grp = NULL; H5G_t *loc = NULL; FUNC_ENTER(H5Gopen, FAIL); /* Check args */ if (NULL==(loc=H5G_loc(loc_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location"); } if (!name || !*name) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name"); } /* Open the group */ if (NULL == (grp = H5G_open(loc, name))) { HRETURN_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open group"); } /* Register an atom for the group */ if ((ret_value = H5I_register(H5_GROUP, grp)) < 0) { H5G_close(grp); HRETURN_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register group"); } FUNC_LEAVE(ret_value); } /*------------------------------------------------------------------------- * Function: H5Gclose * * Purpose: Closes the specified group. The group ID will no longer be * valid for accessing the group. * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Wednesday, December 31, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5Gclose(hid_t grp_id) { FUNC_ENTER(H5Gclose, FAIL); /* Check args */ if (H5_GROUP != H5I_group(grp_id) || NULL == H5I_object(grp_id)) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a group"); } /* * Decrement the counter on the group atom. It will be freed if the count * reaches zero. */ if (H5I_dec_ref(grp_id) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to close group"); } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5Gset * * Purpose: Sets the working group for file handle FILE to the * specified group. * * Each file handle maintains its own notion of the current * working group. That is, if a single file is opened with * multiple calls to H5Fopen(), which returns multiple file * handles, then each handle's current working group can be * set independently of the other file handles for that file. * * The initial current working group is the root group. * * See also: H5Gpush(), H5Gpop() * * Errors: * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Wednesday, September 24, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5Gset(hid_t loc_id, const char *name) { H5G_t *grp = NULL; H5G_t *loc = NULL; FUNC_ENTER(H5Gset, FAIL); /* Check/fix arguments */ if (NULL==(loc=H5G_loc(loc_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location"); } if (!name || !*name) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name"); } /* Set the current working group */ if (NULL == (grp = H5G_open(loc, name))) { HRETURN_ERROR(H5E_ARGS, H5E_NOTFOUND, FAIL, "no such group"); } if (H5G_set(grp) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to change current working group"); } /* Close the handle */ if (H5G_close(grp)<0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to close group"); } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5Gpush * * Purpose: Similar to H5Gset() except the new working group is pushed * on a stack. * * Each file handle maintains its own notion of the current * working group. That is, if a single file is opened with * multiple calls to H5Fopen(), which returns multiple file * handles, then each handle's current working group can be * set independently of the other file handles for that file. * * See also: H5Gset(), H5Gpop() * * Errors: * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Wednesday, September 24, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5Gpush(hid_t loc_id, const char *name) { H5G_t *grp = NULL; H5G_t *loc = NULL; FUNC_ENTER(H5Gpush, FAIL); /* Check arguments */ if (NULL == (loc = H5G_loc(loc_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location"); } if (!name || !*name) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name"); } /* Push group onto stack */ if (NULL == (grp = H5G_open(loc, name))) { HRETURN_ERROR(H5E_ARGS, H5E_NOTFOUND, FAIL, "no such group"); } if (H5G_push(grp) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't change current working group"); } /* Close the handle */ if (H5G_close(grp) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to close group"); } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5Gpop * * Purpose: Removes the top (latest) entry from the working group stack * and sets the current working group to the previous value. * * Each file handle maintains its own notion of the current * working group. That is, if a single file is opened with * multiple calls to H5Fopen(), which returns multiple file * handles, then each handle's current working group can be * set independently of the other file handles for that file. * * If LOC_ID is a group ID then it's used only to determine the * file from which to pop. * * See also: H5Gset(), H5Gpush() * * Errors: * * Return: Success: SUCCEED * * Failure: FAIL. The final entry cannot be popped from * the group stack (but it can be changed * with H5Gset()). * * Programmer: Robb Matzke * Wednesday, September 24, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5Gpop(hid_t loc_id) { H5G_t *loc = NULL; FUNC_ENTER(H5Gpop, FAIL); /* Check arguments */ if (NULL == (loc = H5G_loc(loc_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location"); } /* pop */ if (H5G_pop(H5G_fileof (loc))<0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "stack is empty"); } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5Giterate * * Purpose: Iterates over the entries of a group. The LOC_ID and NAME * identify the group over which to iterate and IDX indicates * where to start iterating (zero means at the beginning). The * OPERATOR is called for each member and the iteration * continues until the operator returns non-zero or all members * are processed. The operator is passed a group ID for the * group being iterated, a member name, and OP_DATA for each * member. * * Return: Success: The return value of the first operator that * returns non-zero, or zero if all members were * processed with no operator returning non-zero. * * Failure: FAIL if something goes wrong within the * library, or a negative value returned by one * of the operators. * * Programmer: Robb Matzke * Monday, March 23, 1998 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5Giterate (hid_t loc_id, const char *name, int *idx, H5G_iterate_t op, void *op_data) { int _idx = 0; H5G_bt_ud2_t udata; herr_t ret_value = FAIL; H5G_t *loc = NULL; FUNC_ENTER (H5Giterate, FAIL); /* Check args */ if (NULL==(loc=H5G_loc (loc_id))) { HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a location"); } if (!name || !*name) { HRETURN_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "no name specified"); } if (!idx) idx = &_idx; if (!op) { HRETURN_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "no operator specified"); } /* * Open the group on which to operate. We also create a group ID which * we can pass to the application-defined operator. */ if (NULL==(udata.group = H5G_open (loc, name))) { HRETURN_ERROR (H5E_SYM, H5E_CANTINIT, FAIL, "unable to open group"); } if ((udata.group_id=H5I_register (H5_GROUP, udata.group))<0) { H5G_close (udata.group); HRETURN_ERROR (H5E_SYM, H5E_CANTINIT, FAIL, "unable to register group"); } /* Build udata to pass through H5B_iterate() to H5G_node_iterate() */ udata.skip = *idx; udata.op = op; udata.op_data = op_data; /* Iterate over the group members */ if ((ret_value = H5B_iterate (H5G_fileof(udata.group), H5B_SNODE, &(udata.group->ent.cache.stab.btree_addr), &udata))<0) { HERROR (H5E_SYM, H5E_CANTINIT, "iteration operator failed"); } H5I_dec_ref (udata.group_id); /*also closes udata.group*/ FUNC_LEAVE (ret_value); } /* *------------------------------------------------------------------------- *------------------------------------------------------------------------- * N O A P I F U N C T I O N S B E Y O N D T H I S P O I N T *------------------------------------------------------------------------- *------------------------------------------------------------------------- */ /*------------------------------------------------------------------------- * Function: H5G_init_interface * * Purpose: Initializes the H5G interface. * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Monday, January 5, 1998 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5G_init_interface(void) { FUNC_ENTER(H5G_init_interface, FAIL); /* Initialize the atom group for the group IDs */ if (H5I_init_group(H5_GROUP, H5I_GROUPID_HASHSIZE, H5G_RESERVED_ATOMS, (herr_t (*)(void *)) H5G_close) < 0 || H5_add_exit(H5G_term_interface) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to initialize interface"); } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_term_interface * * Purpose: Terminates the H5G interface * * Return: void * * Programmer: Robb Matzke * Monday, January 5, 1998 * * Modifications: * *------------------------------------------------------------------------- */ static void H5G_term_interface(void) { H5I_destroy_group(H5_GROUP); } /*------------------------------------------------------------------------- * Function: H5G_component * * Purpose: Returns the pointer to the first component of the * specified name by skipping leading slashes. Returns * the size in characters of the component through SIZE_P not * counting leading slashes or the null terminator. * * Errors: * * Return: Success: Ptr into NAME. * * Failure: Ptr to the null terminator of NAME. * * Programmer: Robb Matzke * matzke@llnl.gov * Aug 11 1997 * * Modifications: * *------------------------------------------------------------------------- */ static const char * H5G_component(const char *name, size_t *size_p) { assert(name); while ('/' == *name) name++; if (size_p) *size_p = HDstrcspn(name, "/"); return name; } /*------------------------------------------------------------------------- * Function: H5G_namei * * Purpose: Translates a name to a symbol table entry. * * If the specified name can be fully resolved, then this * function returns the symbol table entry for the named object * through the OBJ_ENT argument. The symbol table entry for the * group containing the named object is returned through the * GRP_ENT argument if it is non-null. However, if the name * refers to the root object then the GRP_ENT will be * initialized with an undefined object header address. The * REST argument, if present, will point to the null terminator * of NAME. * * If the specified name cannot be fully resolved, then OBJ_ENT * is initialized with the undefined object header address. The * REST argument will point into the NAME argument to the start * of the component that could not be located. The GRP_ENT will * contain the entry for the symbol table that was being * searched at the time of the failure and will have an * undefined object header address if the search failed at the * root object. For instance, if NAME is `/foo/bar/baz' and the * root directory exists and contains an entry for `foo', and * foo is a group that contains an entry for baz, but baz is not * a group, then the results will be that REST points to `baz', * GRP_ENT has an undefined object header address, and GRP_ENT * is the symbol table entry for `bar' in `/foo'. * * Every file has a root group whose name is `/'. Components of * a name are separated from one another by one or more slashes * (/). Slashes at the end of a name are ignored. If the name * begins with a slash then the search begins at the root group * of the file containing LOC_ENT. Otherwise it begins at * LOC_ENT. The component `.' is a no-op, but `..' is not * understood by this function (unless it appears as an entry in * the symbol table). * * Errors: * * Return: Success: SUCCEED if name can be fully resolved. See * above for values of REST, GRP_ENT, and * OBJ_ENT. * * Failure: FAIL if the name could not be fully resolved. * See above for values of REST, GRP_ENT, and * OBJ_ENT. * * Programmer: Robb Matzke * matzke@llnl.gov * Aug 11 1997 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5G_namei(H5G_entry_t *loc_ent, const char *name, const char **rest/*out*/, H5G_entry_t *grp_ent/*out*/, H5G_entry_t *obj_ent/*out*/) { H5G_entry_t _grp_ent; /*entry for current group */ H5G_entry_t _obj_ent; /*entry found */ size_t nchars; /*component name length */ char comp[1024]; /*component name buffer */ /* clear output args before FUNC_ENTER() in case it fails */ if (rest) *rest = name; if (!grp_ent) grp_ent = &_grp_ent; if (!obj_ent) obj_ent = &_obj_ent; memset(grp_ent, 0, sizeof(H5G_entry_t)); H5F_addr_undef(&(grp_ent->header)); memset(obj_ent, 0, sizeof(H5G_entry_t)); H5F_addr_undef(&(obj_ent->header)); FUNC_ENTER(H5G_namei, FAIL); /* * Where does the searching start? For absolute names it starts at the * root of the file; for relative names it starts at CWG. */ if (!name || !*name) { HRETURN_ERROR (H5E_SYM, H5E_NOTFOUND, FAIL, "no name given"); } else if (!loc_ent) { HRETURN_ERROR (H5E_SYM, H5E_NOTFOUND, FAIL, "no current working group"); } else if ('/' == *name) { *obj_ent = loc_ent->file->shared->root_grp->ent; } else { *obj_ent = *loc_ent; } /* traverse the name */ while ((name = H5G_component(name, &nchars)) && *name) { if (rest) *rest = name; /* * Copy the component name into a null-terminated buffer so * we can pass it down to the other symbol table functions. */ if (nchars+1 > sizeof(comp)) { HRETURN_ERROR (H5E_SYM, H5E_COMPLEN, FAIL, "component is too long"); } HDmemcpy(comp, name, nchars); comp[nchars] = '\0'; /* * The special name `.' is a no-op. */ if ('.' == comp[0] && !comp[1]) { name += nchars; continue; } /* * Advance to the next component of the name. */ *grp_ent = *obj_ent; HDmemset(obj_ent, 0, sizeof(H5G_entry_t)); H5F_addr_undef(&(obj_ent->header)); if (H5G_stab_find(grp_ent, comp, obj_ent/*out*/)<0) { /* * Component was not found in the current symbol table, possibly * because GRP_ENT isn't a symbol table. */ HRETURN_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "component not found"); } /* next component */ name += nchars; } if (rest) *rest = name; /*final null */ FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_mkroot * * Purpose: Creates a root group in an empty file and opens it. If a * root group is already open then this function immediately * returnes. If ENT is non-null then it's the symbol table * entry for an existing group which will be opened as the root * group. Otherwise a new root group is created and then * opened. * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * matzke@llnl.gov * Aug 11 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5G_mkroot (H5F_t *f, H5G_entry_t *ent) { H5G_entry_t new_root; /*new root object */ H5O_stab_t stab; /*symbol table message */ FUNC_ENTER(H5G_mkroot, FAIL); /* check args */ assert(f); if (f->shared->root_grp) return SUCCEED; /* * If there is no root object then create one. The root group always has * a hard link count of one since it's pointed to by the boot block. */ if (!ent) { ent = &new_root; if (H5G_stab_create (f, 16, ent/*out*/)<0) { HRETURN_ERROR (H5E_SYM, H5E_CANTINIT, FAIL, "unable to create root group"); } if (1 != H5O_link (ent, 1)) { HRETURN_ERROR (H5E_SYM, H5E_LINK, FAIL, "internal error (wrong link count)"); } } else { /* * Open the root object as a group. */ if (H5O_open (ent)<0) { HRETURN_ERROR (H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open root group"); } if (NULL==H5O_read (ent, H5O_STAB, 0, &stab)) { H5O_close (ent); HRETURN_ERROR (H5E_SYM, H5E_NOTFOUND, FAIL, "root object is not a group"); } H5O_reset (H5O_STAB, &stab); } /* * Create the group pointer. Also decrement the open object count so we * don't count the root group as an open object. The root group will * never be closed. */ f->shared->root_grp = H5MM_xcalloc (1, sizeof(H5G_t)); f->shared->root_grp->ent = *ent; f->shared->root_grp->nref = 1; assert (1==f->nopen); f->nopen = 0; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_create * * Purpose: Creates a new empty group with the specified name. The name * is either an absolute name or is relative to LOC. * * Errors: * * Return: Success: A handle for the group. The group is opened * and should eventually be close by calling * H5G_close(). * * Failure: NULL * * Programmer: Robb Matzke * matzke@llnl.gov * Aug 11 1997 * * Modifications: * *------------------------------------------------------------------------- */ H5G_t * H5G_create(H5G_t *loc, const char *name, size_t size_hint) { const char *rest = NULL; /*the base name */ H5G_entry_t grp_ent; /*group containing new group */ char _comp[1024]; /*name component */ size_t nchars; /*number of characters in compon*/ H5G_t *grp = NULL; /*new group */ FUNC_ENTER(H5G_create, NULL); /* check args */ assert(loc); assert(name && *name); /* lookup name */ if (0 == H5G_namei(H5G_entof(loc), name, &rest, &grp_ent, NULL)) { HRETURN_ERROR(H5E_SYM, H5E_EXISTS, NULL, "already exists"); } H5E_clear(); /*it's OK that we didn't find it */ assert(H5F_addr_defined(&(grp_ent.header))); /* should be one null-terminated component left */ rest = H5G_component(rest, &nchars); assert(rest && *rest); if (rest[nchars]) { if (H5G_component(rest + nchars, NULL)) { HRETURN_ERROR(H5E_SYM, H5E_NOTFOUND, NULL, "missing component"); } else if (nchars + 1 > sizeof _comp) { HRETURN_ERROR(H5E_SYM, H5E_COMPLEN, NULL, "component is too long"); } else { /* null terminate */ HDmemcpy(_comp, rest, nchars); _comp[nchars] = '\0'; rest = _comp; } } /* create an open group */ grp = H5MM_xcalloc(1, sizeof(H5G_t)); if (H5G_stab_create(grp_ent.file, size_hint, &(grp->ent)/*out*/) < 0) { grp = H5MM_xfree(grp); HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "can't create grp"); } /* insert child name into parent */ if (H5G_stab_insert(&grp_ent, rest, &(grp->ent)) < 0) { H5O_close(&(grp->ent)); grp = H5MM_xfree(grp); HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "can't insert"); } grp->nref = 1; FUNC_LEAVE(grp); } /*------------------------------------------------------------------------- * Function: H5G_open * * Purpose: Opens an existing group. The group should eventually be * closed by calling H5G_close(). * * Return: Success: Ptr to a new group. * * Failure: NULL * * Programmer: Robb Matzke * Monday, January 5, 1998 * * Modifications: * *------------------------------------------------------------------------- */ H5G_t * H5G_open(H5G_t *loc, const char *name) { H5G_t *grp = NULL; H5G_t *ret_value = NULL; H5O_stab_t mesg; FUNC_ENTER(H5G_open, NULL); /* Check args */ assert(loc); assert(name && *name); /* Open the object, making sure it's a group */ grp = H5MM_xcalloc(1, sizeof(H5G_t)); if (H5G_find(loc, name, NULL, &(grp->ent)/*out*/) < 0) { HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, NULL, "group not found"); } if (H5O_open(&(grp->ent)) < 0) { HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, NULL, "unable to open group"); } if (NULL==H5O_read (&(grp->ent), H5O_STAB, 0, &mesg)) { H5O_close (&(grp->ent)); HGOTO_ERROR (H5E_SYM, H5E_CANTOPENOBJ, NULL, "not a group"); } grp->nref = 1; ret_value = grp; done: if (!ret_value && grp) { H5MM_xfree(grp); } FUNC_LEAVE(ret_value); } /*------------------------------------------------------------------------- * Function: H5G_reopen * * Purpose: Reopens a group by incrementing the open count. * * Return: Success: The GRP argument. * * Failure: NULL * * Programmer: Robb Matzke * Monday, January 5, 1998 * * Modifications: * *------------------------------------------------------------------------- */ H5G_t * H5G_reopen(H5G_t *grp) { FUNC_ENTER(H5G_reopen, NULL); assert(grp); assert(grp->nref > 0); grp->nref++; FUNC_LEAVE(grp); } /*------------------------------------------------------------------------- * Function: H5G_close * * Purpose: Closes the specified group. * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Monday, January 5, 1998 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5G_close(H5G_t *grp) { FUNC_ENTER(H5G_close, FAIL); /* Check args */ assert(grp); assert(grp->nref > 0); if (1 == grp->nref) { assert (grp!=H5G_fileof(grp)->shared->root_grp); if (H5O_close(&(grp->ent)) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to close"); } } --grp->nref; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_set * * Purpose: Sets the current working group to be the specified group. * This affects only the top item on the group stack for the * specified file as accessed through this file handle. If the * file is opened multiple times, then the current working group * for this file handle is the only one that is changed. * * Note: The group is re-opened and held open until it is removed from * the current working group stack. * * Errors: * SYM CWG Can't open group. * SYM CWG Couldn't close previous c.w.g. * SYM CWG Not a group. * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Wednesday, September 24, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5G_set (H5G_t *grp) { H5F_t *f; FUNC_ENTER(H5G_set, FAIL); /* check args */ assert(grp); f = H5G_fileof (grp); /* * If there is no stack then create one, otherwise close the current * working group. */ if (!f->cwg_stack) { f->cwg_stack = H5MM_xcalloc(1, sizeof(H5G_cwgstk_t)); } else if (H5G_close(f->cwg_stack->grp) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CWG, FAIL, "couldn't close previous current working group"); } f->cwg_stack->grp = H5G_reopen (grp); FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_getcwg * * Purpose: Returns the current working group. * * Return: Success: The current working group. This group should * not* be closed with H5G_close() when the * caller is done with it. * * Failure: NULL * * Programmer: Robb Matzke * Wednesday, September 24, 1997 * * Modifications: * *------------------------------------------------------------------------- */ H5G_t * H5G_getcwg(H5F_t *f) { H5G_t *ret_value = NULL; FUNC_ENTER(H5G_getcwg, NULL); /* check args */ assert(f); if (f->cwg_stack) { ret_value = f->cwg_stack->grp; } else { ret_value = f->shared->root_grp; } FUNC_LEAVE(ret_value); } /*------------------------------------------------------------------------- * Function: H5G_push * * Purpose: Pushes a new current working group onto the stack. The GRP * is reopened and held open until it is removed from the stack. * * Errors: * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Friday, September 19, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5G_push (H5G_t *grp) { H5G_cwgstk_t *stack = NULL; FUNC_ENTER(H5G_push, FAIL); /* check args */ assert(grp); /* * Push a new entry onto the stack. */ stack = H5MM_xcalloc(1, sizeof(H5G_cwgstk_t)); stack->grp = H5G_reopen(grp); stack->next = H5G_fileof(grp)->cwg_stack; H5G_fileof(grp)->cwg_stack = stack; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_pop * * Purpose: Pops the top current working group off the stack. If the * stack becomes empty then the current working group is * implicitly the root group. * * Errors: * * Return: Success: SUCCEED * * Failure: FAIL if the stack is empty. * * Programmer: Robb Matzke * Friday, September 19, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5G_pop (H5F_t *f) { H5G_cwgstk_t *stack = NULL; FUNC_ENTER(H5G_pop, FAIL); /* check args */ assert(f); if ((stack = f->cwg_stack)) { if (H5G_close(stack->grp) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CWG, FAIL, "can't close current working group"); } f->cwg_stack = stack->next; stack->grp = NULL; H5MM_xfree(stack); } else { HRETURN_ERROR(H5E_SYM, H5E_CWG, FAIL, "stack is empty"); } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_insert * * Purpose: Inserts a symbol table entry into the group graph. * * Errors: * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Friday, September 19, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5G_insert(H5G_t *loc, const char *name, H5G_entry_t *ent) { const char *rest = NULL; /*part of name not existing yet */ H5G_entry_t grp; /*entry for group to contain obj */ size_t nchars; /*number of characters in name */ char _comp[1024]; /*name component */ FUNC_ENTER(H5G_insert, FAIL); /* Check args. */ assert (loc); assert (name && *name); assert (ent); /* * Look up the name -- it shouldn't exist yet. */ if (H5G_namei(H5G_entof(loc), name, &rest, &grp, NULL) >= 0) { HRETURN_ERROR(H5E_SYM, H5E_EXISTS, FAIL, "already exists"); } H5E_clear(); /*it's OK that we didn't find it */ rest = H5G_component(rest, &nchars); /* * There should be one component left. Make sure it's null * terminated. */ if (rest[nchars]) { if (H5G_component(rest + nchars, NULL)) { HRETURN_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "component not found"); } else if (nchars + 1 > sizeof _comp) { HRETURN_ERROR(H5E_SYM, H5E_COMPLEN, FAIL, "component is too long"); } else { /* null terminate */ HDmemcpy(_comp, rest, nchars); _comp[nchars] = '\0'; rest = _comp; } } /* * The object into a symbol table. */ if (H5O_link(ent, 1) < 0) { HRETURN_ERROR(H5E_SYM, H5E_LINK, FAIL, "link inc failure"); } if (H5G_stab_insert(&grp, rest, ent) < 0) { HRETURN_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't insert"); } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_find * * Purpose: Finds an object with the specified NAME at location LOC. On * successful return, GRP_ENT (if non-null) will be initialized * with the symbol table information for the group in which the * object appears (it will have an undefined object header * address if the object is the root object) and OBJ_ENT will be * initialized with the symbol table entry for the object * (OBJ_ENT is optional when the caller is interested only in * the existence of the object). * * Errors: * * Return: Success: SUCCEED, see above for values of GRP_ENT and * OBJ_ENT. * * Failure: FAIL * * Programmer: Robb Matzke * matzke@llnl.gov * Aug 12 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5G_find(H5G_t *loc, const char *name, H5G_entry_t *grp_ent/*out*/, H5G_entry_t *obj_ent/*out*/) { FUNC_ENTER(H5G_find, FAIL); /* check args */ assert (loc); assert (name && *name); if (H5G_namei(H5G_entof(loc), name, NULL, grp_ent, obj_ent) < 0) { HRETURN_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "object not found"); } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5G_entof * * Purpose: Returns a pointer to the entry for a group. * * Return: Success: Ptr to group entry * * Failure: NULL * * Programmer: Robb Matzke * Tuesday, March 24, 1998 * * Modifications: * *------------------------------------------------------------------------- */ H5G_entry_t * H5G_entof (H5G_t *grp) { return grp ? &(grp->ent) : NULL; } /*------------------------------------------------------------------------- * Function: H5G_fileof * * Purpose: Returns the file to which the specified group belongs. * * Return: Success: File pointer. * * Failure: NULL * * Programmer: Robb Matzke * Tuesday, March 24, 1998 * * Modifications: * *------------------------------------------------------------------------- */ H5F_t * H5G_fileof (H5G_t *grp) { assert (grp); return grp->ent.file; } /*------------------------------------------------------------------------- * Function: H5G_loc * * Purpose: Given a location ID return a group. The group should not be * closed. * * Return: Success: Group pointer. * * Failure: NULL * * Programmer: Robb Matzke * Tuesday, March 24, 1998 * * Modifications: * *------------------------------------------------------------------------- */ H5G_t * H5G_loc (hid_t loc_id) { H5F_t *f; H5G_t *ret_value = NULL; FUNC_ENTER (H5G_loc, NULL); if (H5_FILE==H5I_group (loc_id)) { if (NULL==(f=H5I_object (loc_id))) { HRETURN_ERROR (H5E_ARGS, H5E_BADVALUE, NULL, "invalid file ID"); } if (NULL==(ret_value=H5G_getcwg (f))) { HRETURN_ERROR (H5E_ARGS, H5E_BADVALUE, NULL, "unable to get current working directory"); } } else if (H5_GROUP==H5I_group (loc_id)) { if (NULL==(ret_value=H5I_object (loc_id))) { HRETURN_ERROR (H5E_ARGS, H5E_BADVALUE, NULL, "invalid group ID"); } } else { HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, NULL, "not a location"); } FUNC_LEAVE (ret_value); }