2001-07-22 19:47:08 +02:00
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/* Cache handling for iconv modules.
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2002-08-05 01:32:14 +02:00
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Copyright (C) 2001, 2002 Free Software Foundation, Inc.
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2001-07-22 19:47:08 +02:00
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 2001.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <gconv_int.h>
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#include <iconvconfig.h>
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#include "../intl/hash-string.h"
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2002-08-05 01:32:14 +02:00
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static void *gconv_cache;
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2001-07-22 19:47:08 +02:00
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static size_t cache_size;
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static int cache_malloced;
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2002-08-05 01:32:14 +02:00
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void *
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__gconv_get_cache (void)
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{
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return gconv_cache;
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}
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2001-07-22 19:47:08 +02:00
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int
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internal_function
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__gconv_load_cache (void)
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{
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int fd;
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struct stat64 st;
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struct gconvcache_header *header;
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/* We cannot use the cache if the GCONV_PATH environment variable is
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set. */
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__gconv_path_envvar = getenv ("GCONV_PATH");
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if (__gconv_path_envvar != NULL)
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return -1;
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/* See whether the cache file exists. */
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fd = __open (GCONV_MODULES_CACHE, O_RDONLY);
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if (__builtin_expect (fd, 0) == -1)
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/* Not available. */
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return -1;
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/* Get information about the file. */
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if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0
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/* We do not have to start looking at the file if it cannot contain
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at least the cache header. */
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2002-08-25 06:51:08 +02:00
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|| (size_t) st.st_size < sizeof (struct gconvcache_header))
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2001-07-22 19:47:08 +02:00
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{
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close_and_exit:
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2001-08-17 09:51:36 +02:00
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__close (fd);
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2001-07-22 19:47:08 +02:00
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return -1;
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}
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/* Make the file content available. */
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cache_size = st.st_size;
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#ifdef _POSIX_MAPPED_FILES
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2002-08-05 01:32:14 +02:00
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gconv_cache = __mmap (NULL, cache_size, PROT_READ, MAP_SHARED, fd, 0);
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if (__builtin_expect (gconv_cache == MAP_FAILED, 0))
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2001-07-22 19:47:08 +02:00
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#endif
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{
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size_t already_read;
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2002-08-05 01:32:14 +02:00
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gconv_cache = malloc (cache_size);
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if (gconv_cache == NULL)
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2001-07-22 19:47:08 +02:00
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goto close_and_exit;
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already_read = 0;
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do
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{
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2002-08-05 01:32:14 +02:00
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ssize_t n = __read (fd, (char *) gconv_cache + already_read,
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2001-07-22 19:47:08 +02:00
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cache_size - already_read);
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if (__builtin_expect (n, 0) == -1)
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{
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2002-08-05 01:32:14 +02:00
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free (gconv_cache);
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gconv_cache = NULL;
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2001-07-22 19:47:08 +02:00
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goto close_and_exit;
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}
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already_read += n;
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}
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while (already_read < cache_size);
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cache_malloced = 1;
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}
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/* We don't need the file descriptor anymore. */
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2001-08-17 09:51:36 +02:00
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__close (fd);
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2001-07-22 19:47:08 +02:00
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/* Check the consistency. */
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2002-08-05 01:32:14 +02:00
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header = (struct gconvcache_header *) gconv_cache;
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2001-07-22 19:47:08 +02:00
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if (__builtin_expect (header->magic, GCONVCACHE_MAGIC) != GCONVCACHE_MAGIC
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|| __builtin_expect (header->string_offset >= cache_size, 0)
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|| __builtin_expect (header->hash_offset >= cache_size, 0)
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|| __builtin_expect (header->hash_size == 0, 0)
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|| __builtin_expect ((header->hash_offset
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+ header->hash_size * sizeof (struct hash_entry))
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> cache_size, 0)
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|| __builtin_expect (header->module_offset >= cache_size, 0)
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|| __builtin_expect (header->otherconv_offset > cache_size, 0))
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{
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if (cache_malloced)
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{
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2002-08-05 01:32:14 +02:00
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free (gconv_cache);
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2001-07-22 19:47:08 +02:00
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cache_malloced = 0;
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}
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#ifdef _POSIX_MAPPED_FILES
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else
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2002-08-05 01:32:14 +02:00
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__munmap (gconv_cache, cache_size);
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2001-07-22 19:47:08 +02:00
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#endif
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2002-08-05 01:32:14 +02:00
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gconv_cache = NULL;
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2001-07-22 19:47:08 +02:00
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return -1;
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}
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/* That worked. */
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return 0;
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}
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static int
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internal_function
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find_module_idx (const char *str, size_t *idxp)
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{
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unsigned int idx;
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unsigned int hval;
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unsigned int hval2;
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const struct gconvcache_header *header;
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const char *strtab;
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const struct hash_entry *hashtab;
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unsigned int limit;
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2002-08-05 01:32:14 +02:00
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header = (const struct gconvcache_header *) gconv_cache;
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strtab = (char *) gconv_cache + header->string_offset;
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hashtab = (struct hash_entry *) ((char *) gconv_cache
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2001-09-01 21:03:22 +02:00
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+ header->hash_offset);
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2001-07-22 19:47:08 +02:00
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hval = hash_string (str);
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idx = hval % header->hash_size;
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hval2 = 1 + hval % (header->hash_size - 2);
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limit = cache_size - header->string_offset;
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while (hashtab[idx].string_offset != 0)
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if (hashtab[idx].string_offset < limit
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&& strcmp (str, strtab + hashtab[idx].string_offset) == 0)
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{
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*idxp = hashtab[idx].module_idx;
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return 0;
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}
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else
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if ((idx += hval2) >= header->hash_size)
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idx -= header->hash_size;
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/* Nothing found. */
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return -1;
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}
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2001-08-16 07:39:18 +02:00
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#ifndef STATIC_GCONV
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2001-07-22 19:47:08 +02:00
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static int
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internal_function
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find_module (const char *directory, const char *filename,
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struct __gconv_step *result)
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{
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size_t dirlen = strlen (directory);
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size_t fnamelen = strlen (filename) + 1;
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2001-07-24 23:30:18 +02:00
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char fullname[dirlen + fnamelen];
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2001-07-24 01:01:08 +02:00
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int status = __GCONV_NOCONV;
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2001-07-22 19:47:08 +02:00
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memcpy (__mempcpy (fullname, directory, dirlen), filename, fnamelen);
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result->__shlib_handle = __gconv_find_shlib (fullname);
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2001-07-24 01:01:08 +02:00
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if (result->__shlib_handle != NULL)
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{
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status = __GCONV_OK;
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2001-07-24 23:30:18 +02:00
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result->__modname = NULL;
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2001-07-24 01:01:08 +02:00
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result->__fct = result->__shlib_handle->fct;
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result->__init_fct = result->__shlib_handle->init_fct;
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result->__end_fct = result->__shlib_handle->end_fct;
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2001-07-22 19:47:08 +02:00
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2002-12-02 23:39:58 +01:00
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/* These settings can be overridden by the init function. */
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result->__btowc_fct = NULL;
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2001-07-24 01:01:08 +02:00
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result->__data = NULL;
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2002-12-02 23:39:58 +01:00
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/* Call the init function. */
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2001-07-24 01:01:08 +02:00
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if (result->__init_fct != NULL)
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status = DL_CALL_FCT (result->__init_fct, (result));
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}
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2001-07-22 19:47:08 +02:00
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return status;
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}
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2001-08-16 07:39:18 +02:00
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#endif
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2001-07-22 19:47:08 +02:00
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2001-07-27 19:26:26 +02:00
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int
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internal_function
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__gconv_compare_alias_cache (const char *name1, const char *name2, int *result)
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{
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size_t name1_idx;
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size_t name2_idx;
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2002-08-05 01:32:14 +02:00
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if (gconv_cache == NULL)
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2001-07-27 19:26:26 +02:00
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return -1;
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if (find_module_idx (name1, &name1_idx) != 0
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|| find_module_idx (name2, &name2_idx) != 0)
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*result = strcmp (name1, name2);
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else
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*result = (int) (name1_idx - name2_idx);
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return 0;
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}
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2001-07-22 19:47:08 +02:00
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int
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internal_function
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__gconv_lookup_cache (const char *toset, const char *fromset,
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struct __gconv_step **handle, size_t *nsteps, int flags)
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{
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const struct gconvcache_header *header;
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const char *strtab;
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size_t fromidx;
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size_t toidx;
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const struct module_entry *modtab;
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const struct module_entry *from_module;
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const struct module_entry *to_module;
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struct __gconv_step *result;
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2002-08-05 01:32:14 +02:00
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if (gconv_cache == NULL)
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2001-07-22 19:47:08 +02:00
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/* We have no cache available. */
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return __GCONV_NODB;
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2002-08-05 01:32:14 +02:00
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header = (const struct gconvcache_header *) gconv_cache;
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strtab = (char *) gconv_cache + header->string_offset;
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modtab = (const struct module_entry *) ((char *) gconv_cache
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2001-07-22 19:47:08 +02:00
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+ header->module_offset);
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if (find_module_idx (fromset, &fromidx) != 0
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|| (header->module_offset + (fromidx + 1) * sizeof (struct module_entry)
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> cache_size))
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return __GCONV_NOCONV;
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from_module = &modtab[fromidx];
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if (find_module_idx (toset, &toidx) != 0
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|| (header->module_offset + (toidx + 1) * sizeof (struct module_entry)
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> cache_size))
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2001-07-24 09:54:33 +02:00
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return __GCONV_NOCONV;
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2001-07-22 19:47:08 +02:00
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to_module = &modtab[toidx];
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/* Avoid copy-only transformations if the user requests. */
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if (__builtin_expect (flags & GCONV_AVOID_NOCONV, 0) && fromidx == toidx)
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return __GCONV_NOCONV;
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/* If there are special conversions available examine them first. */
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2001-07-24 01:01:08 +02:00
|
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if (fromidx != 0 && toidx != 0
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&& __builtin_expect (from_module->extra_offset, 0) != 0)
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2001-07-22 19:47:08 +02:00
|
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{
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|
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/* Search through the list to see whether there is a module
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matching the destination character set. */
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const struct extra_entry *extra;
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|
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/* Note the -1. This is due to the offset added in iconvconfig.
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See there for more explanations. */
|
2002-08-05 01:32:14 +02:00
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extra = (const struct extra_entry *) ((char *) gconv_cache
|
2001-07-22 19:47:08 +02:00
|
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|
+ header->otherconv_offset
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|
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+ from_module->extra_offset - 1);
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|
|
while (extra->module_cnt != 0
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|
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&& extra->module[extra->module_cnt - 1].outname_offset != toidx)
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extra = (const struct extra_entry *) ((char *) extra
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|
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+ sizeof (struct extra_entry)
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|
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+ (extra->module_cnt
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|
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* sizeof (struct extra_entry_module)));
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|
|
|
|
|
|
if (extra->module_cnt != 0)
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|
|
{
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|
|
|
/* Use the extra module. First determine how many steps. */
|
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|
|
char *fromname;
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|
|
int idx;
|
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|
|
|
|
|
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*nsteps = extra->module_cnt;
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|
|
*handle = result =
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|
|
(struct __gconv_step *) malloc (extra->module_cnt
|
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|
|
* sizeof (struct __gconv_step));
|
|
|
|
if (result == NULL)
|
|
|
|
return __GCONV_NOMEM;
|
|
|
|
|
|
|
|
fromname = (char *) strtab + from_module->canonname_offset;
|
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|
|
idx = 0;
|
|
|
|
do
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|
|
|
{
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|
|
|
result[idx].__from_name = fromname;
|
|
|
|
fromname = result[idx].__to_name =
|
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|
|
(char *) strtab + modtab[extra->module[idx].outname_offset].canonname_offset;
|
|
|
|
|
2001-07-23 11:10:36 +02:00
|
|
|
result[idx].__counter = 1;
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|
|
result[idx].__data = NULL;
|
|
|
|
|
2001-07-22 19:47:08 +02:00
|
|
|
#ifndef STATIC_GCONV
|
|
|
|
if (strtab[extra->module[idx].dir_offset] != '\0')
|
|
|
|
{
|
|
|
|
/* Load the module, return handle for it. */
|
|
|
|
int res;
|
|
|
|
|
|
|
|
res = find_module (strtab + extra->module[idx].dir_offset,
|
|
|
|
strtab + extra->module[idx].name_offset,
|
|
|
|
&result[idx]);
|
|
|
|
if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
|
|
|
|
{
|
|
|
|
/* Something went wrong. */
|
|
|
|
free (result);
|
|
|
|
goto try_internal;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
/* It's a builtin transformation. */
|
|
|
|
__gconv_get_builtin_trans (strtab
|
|
|
|
+ extra->module[idx].name_offset,
|
|
|
|
&result[idx]);
|
|
|
|
|
|
|
|
}
|
|
|
|
while (++idx < extra->module_cnt);
|
|
|
|
|
|
|
|
return __GCONV_OK;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
try_internal:
|
|
|
|
/* See whether we can convert via the INTERNAL charset. */
|
2001-07-24 01:01:08 +02:00
|
|
|
if ((fromidx != 0 && __builtin_expect (from_module->fromname_offset, 1) == 0)
|
2001-07-24 20:49:46 +02:00
|
|
|
|| (toidx != 0 && __builtin_expect (to_module->toname_offset, 1) == 0)
|
|
|
|
|| (fromidx == 0 && toidx == 0))
|
2001-07-22 19:47:08 +02:00
|
|
|
/* Not possible. Nothing we can do. */
|
|
|
|
return __GCONV_NOCONV;
|
|
|
|
|
2001-07-24 20:49:46 +02:00
|
|
|
/* We will use up to two modules. Always allocate room for two. */
|
2001-07-22 19:47:08 +02:00
|
|
|
result = (struct __gconv_step *) malloc (2 * sizeof (struct __gconv_step));
|
|
|
|
if (result == NULL)
|
|
|
|
return __GCONV_NOMEM;
|
|
|
|
|
|
|
|
*handle = result;
|
2001-07-24 01:01:08 +02:00
|
|
|
*nsteps = 0;
|
2001-07-22 19:47:08 +02:00
|
|
|
|
|
|
|
/* Generate data structure for conversion to INTERNAL. */
|
2001-07-24 01:01:08 +02:00
|
|
|
if (fromidx != 0)
|
|
|
|
{
|
|
|
|
result[0].__from_name = (char *) strtab + from_module->canonname_offset;
|
|
|
|
result[0].__to_name = (char *) "INTERNAL";
|
2001-07-22 19:47:08 +02:00
|
|
|
|
2001-07-24 01:01:08 +02:00
|
|
|
result[0].__counter = 1;
|
|
|
|
result[0].__data = NULL;
|
2001-07-23 11:10:36 +02:00
|
|
|
|
2001-07-22 19:47:08 +02:00
|
|
|
#ifndef STATIC_GCONV
|
2001-07-24 01:01:08 +02:00
|
|
|
if (strtab[from_module->todir_offset] != '\0')
|
2001-07-22 19:47:08 +02:00
|
|
|
{
|
2001-07-24 01:01:08 +02:00
|
|
|
/* Load the module, return handle for it. */
|
|
|
|
int res = find_module (strtab + from_module->todir_offset,
|
|
|
|
strtab + from_module->toname_offset,
|
|
|
|
&result[0]);
|
|
|
|
if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
|
|
|
|
{
|
|
|
|
/* Something went wrong. */
|
|
|
|
free (result);
|
|
|
|
return res;
|
|
|
|
}
|
2001-07-22 19:47:08 +02:00
|
|
|
}
|
2001-07-24 01:01:08 +02:00
|
|
|
else
|
2001-07-22 19:47:08 +02:00
|
|
|
#endif
|
2001-07-24 01:01:08 +02:00
|
|
|
/* It's a builtin transformation. */
|
|
|
|
__gconv_get_builtin_trans (strtab + from_module->toname_offset,
|
|
|
|
&result[0]);
|
|
|
|
|
|
|
|
++*nsteps;
|
|
|
|
}
|
2001-07-22 19:47:08 +02:00
|
|
|
|
|
|
|
/* Generate data structure for conversion from INTERNAL. */
|
2001-07-24 01:01:08 +02:00
|
|
|
if (toidx != 0)
|
|
|
|
{
|
|
|
|
int idx = *nsteps;
|
2001-07-22 19:47:08 +02:00
|
|
|
|
2001-07-24 01:01:08 +02:00
|
|
|
result[idx].__from_name = (char *) "INTERNAL";
|
|
|
|
result[idx].__to_name = (char *) strtab + to_module->canonname_offset;
|
|
|
|
|
|
|
|
result[idx].__counter = 1;
|
|
|
|
result[idx].__data = NULL;
|
2001-07-23 11:10:36 +02:00
|
|
|
|
2001-07-22 19:47:08 +02:00
|
|
|
#ifndef STATIC_GCONV
|
2001-07-24 01:01:08 +02:00
|
|
|
if (strtab[to_module->fromdir_offset] != '\0')
|
2001-07-22 19:47:08 +02:00
|
|
|
{
|
2001-07-24 01:01:08 +02:00
|
|
|
/* Load the module, return handle for it. */
|
|
|
|
int res = find_module (strtab + to_module->fromdir_offset,
|
|
|
|
strtab + to_module->fromname_offset,
|
|
|
|
&result[idx]);
|
|
|
|
if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
|
|
|
|
{
|
|
|
|
/* Something went wrong. */
|
|
|
|
if (idx != 0)
|
|
|
|
__gconv_release_step (&result[0]);
|
|
|
|
free (result);
|
|
|
|
return res;
|
|
|
|
}
|
2001-07-22 19:47:08 +02:00
|
|
|
}
|
2001-07-24 01:01:08 +02:00
|
|
|
else
|
2001-07-22 19:47:08 +02:00
|
|
|
#endif
|
2001-07-24 01:01:08 +02:00
|
|
|
/* It's a builtin transformation. */
|
|
|
|
__gconv_get_builtin_trans (strtab + to_module->fromname_offset,
|
|
|
|
&result[idx]);
|
|
|
|
|
|
|
|
++*nsteps;
|
|
|
|
}
|
2001-07-22 19:47:08 +02:00
|
|
|
|
|
|
|
return __GCONV_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2001-07-24 23:30:18 +02:00
|
|
|
/* Free memory allocated for the transformation record. */
|
|
|
|
void
|
|
|
|
internal_function
|
|
|
|
__gconv_release_cache (struct __gconv_step *steps, size_t nsteps)
|
|
|
|
{
|
2002-08-05 01:32:14 +02:00
|
|
|
if (gconv_cache != NULL)
|
2001-07-24 23:30:18 +02:00
|
|
|
/* The only thing we have to deallocate is the record with the
|
|
|
|
steps. */
|
|
|
|
free (steps);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2001-07-22 19:47:08 +02:00
|
|
|
/* Free all resources if necessary. */
|
2002-11-01 21:44:15 +01:00
|
|
|
libc_freeres_fn (free_mem)
|
2001-07-22 19:47:08 +02:00
|
|
|
{
|
|
|
|
if (cache_malloced)
|
2002-08-05 01:32:14 +02:00
|
|
|
free (gconv_cache);
|
2001-07-22 19:47:08 +02:00
|
|
|
#ifdef _POSIX_MAPPED_FILES
|
|
|
|
else
|
2002-08-05 01:32:14 +02:00
|
|
|
__munmap (gconv_cache, cache_size);
|
2001-07-22 19:47:08 +02:00
|
|
|
#endif
|
|
|
|
}
|