mirror of https://gitee.com/openkylin/hdf5.git
332 lines
9.2 KiB
C
332 lines
9.2 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include "h5tools_ref.h"
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#include "H5private.h"
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#include "H5SLprivate.h"
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#include "h5tools.h"
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#include "h5tools_utils.h"
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#include "h5trav.h"
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/*
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* Table to look up a path name for an object
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* reference.
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*
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* This table stores mappings of reference -> path
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* for all objects in the file that may be the target of
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* an object reference.
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*
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* The 'path' is an absolute path by which the object
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* can be accessed. When an object has > 1 such path,
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* only one will be used in the table, with no particular
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* method of selecting which one.
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*/
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typedef struct {
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haddr_t objno; /* Object ID (i.e. address) */
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char *path; /* Object path */
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} ref_path_node_t;
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static H5SL_t *ref_path_table = NULL; /* the "table" (implemented with a skip list) */
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static hid_t thefile = (-1);
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static int ref_path_table_put(const char *, haddr_t objno);
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/*-------------------------------------------------------------------------
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* Function: free_ref_path_info
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*
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* Purpose: Free the key for a reference path table node
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*
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* Return: Non-negative on success, negative on failure
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*
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* Programmer: Quincey Koziol
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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static herr_t
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free_ref_path_info(void *item, void H5_ATTR_UNUSED *key, void H5_ATTR_UNUSED *operator_data/*in,out*/)
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{
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ref_path_node_t *node = (ref_path_node_t *)item;
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HDfree(node->path);
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HDfree(node);
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return(0);
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}
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/*-------------------------------------------------------------------------
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* Function: init_ref_path_cb
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*
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* Purpose: Called by interator to create references for
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* all objects and enter them in the table.
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*
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* Return: Error status.
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*
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* Programmer: REMcG
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*
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*-------------------------------------------------------------------------
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*/
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static herr_t
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init_ref_path_cb(const char *obj_name, const H5O_info_t *oinfo,
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const char *already_seen, void H5_ATTR_UNUSED *_udata)
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{
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/* Check if the object is already in the path table */
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if(NULL == already_seen) {
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/* Insert the object into the path table */
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ref_path_table_put(obj_name, oinfo->addr);
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} /* end if */
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return 0;
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}
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/*-------------------------------------------------------------------------
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* Function: init_ref_path_table
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*
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* Purpose: Initalize the reference path table
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*
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* Return: Non-negative on success, negative on failure
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*
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* Programmer: Quincey Koziol
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*
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*-------------------------------------------------------------------------
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*/
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static int
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init_ref_path_table(void)
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{
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/* Sanity check */
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if(thefile > 0) {
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/* Create skip list to store reference path information */
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if((ref_path_table = H5SL_create(H5SL_TYPE_HADDR, NULL))==NULL)
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return (-1);
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/* Iterate over objects in this file */
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if(h5trav_visit(thefile, "/", TRUE, TRUE, init_ref_path_cb, NULL, NULL, H5O_INFO_BASIC) < 0) {
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error_msg("unable to construct reference path table\n");
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h5tools_setstatus(EXIT_FAILURE);
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} /* end if */
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return(0);
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}
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else
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return (-1);
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}
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/*-------------------------------------------------------------------------
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* Function: term_ref_path_table
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*
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* Purpose: Terminate the reference path table
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*
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* Return: Non-negative on success, negative on failure
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*
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* Programmer: Quincey Koziol
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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int
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term_ref_path_table(void)
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{
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/* Destroy reference path table, freeing all memory */
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if(ref_path_table)
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H5SL_destroy(ref_path_table, free_ref_path_info, NULL);
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return(0);
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}
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/*-------------------------------------------------------------------------
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* Function: ref_path_table_lookup
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*
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* Purpose: Looks up a table entry given a path name.
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* Used during construction of the table.
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*
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* Return: The table entre (pte) or NULL if not in the
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* table.
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*
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* Programmer: REMcG
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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haddr_t
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ref_path_table_lookup(const char *thepath)
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{
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H5O_info_t oi;
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if((thepath == NULL) || (HDstrlen(thepath) == 0))
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return HADDR_UNDEF;
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/* Allow lookups on the root group, even though it doesn't have any link info */
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if(HDstrcmp(thepath, "/")) {
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H5L_info_t li;
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/* Check for external link first, so we don't return the OID of an object in another file */
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if(H5Lget_info(thefile, thepath, &li, H5P_DEFAULT) < 0)
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return HADDR_UNDEF;
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/* UD links can't be followed, so they always "dangle" like soft links. */
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if(li.type >= H5L_TYPE_UD_MIN)
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return HADDR_UNDEF;
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} /* end if */
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/* Get the object info now */
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/* (returns failure for dangling soft links) */
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if(H5Oget_info_by_name2(thefile, thepath, &oi, H5O_INFO_BASIC, H5P_DEFAULT) < 0)
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return HADDR_UNDEF;
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/* Return OID */
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return(oi.addr);
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}
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/*-------------------------------------------------------------------------
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* Function: ref_path_table_put
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*
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* Purpose: Enter the 'obj' with 'path' in the table (assumes its not
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* already there)
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*
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* Create an object reference, pte, and store them
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* in the table.
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*
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* NOTE: Takes ownership of the path name string passed in!
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*
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* Return: Non-negative on success, negative on failure
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*
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* Programmer: REMcG
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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static int
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ref_path_table_put(const char *path, haddr_t objno)
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{
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ref_path_node_t *new_node;
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if(ref_path_table && path) {
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if((new_node = (ref_path_node_t *)HDmalloc(sizeof(ref_path_node_t))) == NULL)
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return(-1);
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new_node->objno = objno;
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new_node->path = HDstrdup(path);
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return(H5SL_insert(ref_path_table, new_node, &(new_node->objno)));
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}
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else
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return (-1);
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}
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/*
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* counter used to disambiguate multiple instances of same object.
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*/
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int xid = 1;
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int get_next_xid(void) {
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return xid++;
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}
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/*
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* This counter is used to create fake object ID's
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* The idea is to set it to the largest possible offest, which
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* minimizes the chance of collision with a real object id.
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*
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*/
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haddr_t fake_xid = HADDR_MAX;
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haddr_t
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get_fake_xid (void) {
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return (fake_xid--);
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}
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/*
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* for an object that does not have an object id (e.g., soft link),
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* create a table entry with a fake object id as the key.
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*
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* Assumes 'path' is for an object that is not in the table.
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*
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*/
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haddr_t
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ref_path_table_gen_fake(const char *path)
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{
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haddr_t fake_objno;
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/* Generate fake ID for string */
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fake_objno = get_fake_xid();
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/* Create ref path table, if it hasn't already been created */
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if(ref_path_table == NULL)
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init_ref_path_table();
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/* Insert "fake" object into table */
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ref_path_table_put(path, fake_objno);
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return(fake_objno);
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}
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/*-------------------------------------------------------------------------
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* Function: lookup_ref_path
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*
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* Purpose: Lookup the path to the object with refernce 'ref'.
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*
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* Return: Return a path to the object, or NULL if not found.
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*
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* Programmer: REMcG
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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const char *
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lookup_ref_path(haddr_t ref)
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{
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ref_path_node_t *node;
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/* Be safer for h5ls */
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if(thefile < 0)
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return(NULL);
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/* Create ref path table, if it hasn't already been created */
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if(ref_path_table == NULL)
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init_ref_path_table();
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node = (ref_path_node_t *)H5SL_search(ref_path_table, &ref);
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return(node ? node->path : NULL);
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}
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/*-------------------------------------------------------------------------
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* Function: fill_ref_path_table
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*
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* Purpose: Called by interator to create references for
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* all objects and enter them in the table.
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*
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* Return: Error status.
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*
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* Programmer: REMcG
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*
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*-------------------------------------------------------------------------
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*/
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herr_t
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fill_ref_path_table(hid_t fid)
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{
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/* Set file ID for later queries (XXX: this should be fixed) */
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thefile = fid;
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/* Defer creating the ref path table until it's needed */
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return 0;
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}
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