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/* Reading binary .mo files.
Copyright (C) 1995-1998, 2000, 2001 Free Software Foundation, Inc.
Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, April 1995.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/* Specification. */
#include "read-mo.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* This include file describes the main part of binary .mo format. */
#include "gettext.h"
#include "error.h"
#include "system.h"
#include "message.h"
#include "libgettext.h"
#define _(str) gettext (str)
/* This defines the byte order within the file. It needs to be set
appropriately once we have the file open. */
static enum { MO_LITTLE_ENDIAN, MO_BIG_ENDIAN } endian;
/* Prototypes for local functions. Needed to ensure compiler checking of
function argument counts despite of K&R C function definition syntax. */
static nls_uint32 read32 PARAMS ((FILE *fp, const char *fn));
static void seek32 PARAMS ((FILE *fp, const char *fn, long offset));
static char *string32 PARAMS ((FILE *fp, const char *fn, long offset,
size_t *lengthp));
/* This function reads a 32-bit number from the file, and assembles it
according to the current ``endian'' setting. */
static nls_uint32
read32 (fp, fn)
FILE *fp;
const char *fn;
{
int c1, c2, c3, c4;
c1 = getc (fp);
if (c1 == EOF)
{
bomb:
if (ferror (fp))
error (EXIT_FAILURE, errno, _("error while reading \"%s\""), fn);
error (EXIT_FAILURE, 0, _("file \"%s\" truncated"), fn);
}
c2 = getc (fp);
if (c2 == EOF)
goto bomb;
c3 = getc (fp);
if (c3 == EOF)
goto bomb;
c4 = getc (fp);
if (c4 == EOF)
goto bomb;
if (endian == MO_LITTLE_ENDIAN)
return (((nls_uint32) c1)
| ((nls_uint32) c2 << 8)
| ((nls_uint32) c3 << 16)
| ((nls_uint32) c4 << 24));
return (((nls_uint32) c1 << 24)
| ((nls_uint32) c2 << 16)
| ((nls_uint32) c3 << 8)
| ((nls_uint32) c4));
}
static void
seek32 (fp, fn, offset)
FILE *fp;
const char *fn;
long offset;
{
if (fseek (fp, offset, 0) < 0)
error (EXIT_FAILURE, errno, _("seek \"%s\" offset %ld failed"),
fn, offset);
}
static char *
string32 (fp, fn, offset, lengthp)
FILE *fp;
const char *fn;
long offset;
size_t *lengthp;
{
long length;
char *buffer;
long n;
/* Read the string_desc structure, describing where in the file to
find the string. */
seek32 (fp, fn, offset);
length = read32 (fp, fn);
offset = read32 (fp, fn);
/* Allocate memory for the string to be read into. Leave space for
the NUL on the end. */
buffer = (char *) xmalloc (length + 1);
/* Read in the string. Complain if there is an error or it comes up
short. Add the NUL ourselves. */
seek32 (fp, fn, offset);
n = fread (buffer, 1, length + 1, fp);
if (n != length + 1)
{
if (ferror (fp))
error (EXIT_FAILURE, errno, _("error while reading \"%s\""), fn);
error (EXIT_FAILURE, 0, _("file \"%s\" truncated"), fn);
}
if (buffer[length] != '\0')
{
error (EXIT_FAILURE, 0,
_("file \"%s\" contains a not NUL terminated string"), fn);
}
/* Return the string to the caller. */
*lengthp = length + 1;
return buffer;
}
/* This function reads an existing .mo file. */
void
read_mo_file (mlp, fn)
message_list_ty *mlp;
const char *fn;
{
FILE *fp;
struct mo_file_header header;
int j;
if (strcmp (fn, "-") == 0 || strcmp (fn, "/dev/stdin") == 0)
{
fp = stdin;
SET_BINARY (fileno (fp));
}
else
{
fp = fopen (fn, "rb");
if (fp == NULL)
error (EXIT_FAILURE, errno,
_("error while opening \"%s\" for reading"), fn);
}
/* We must grope the file to determine which endian it is.
Perversity of the universe tends towards maximum, so it will
probably not match the currently executing architecture. */
endian = MO_BIG_ENDIAN;
header.magic = read32 (fp, fn);
if (header.magic != _MAGIC)
{
endian = MO_LITTLE_ENDIAN;
seek32 (fp, fn, 0L);
header.magic = read32 (fp, fn);
if (header.magic != _MAGIC)
{
unrecognised:
error (EXIT_FAILURE, 0, _("file \"%s\" is not in GNU .mo format"),
fn);
}
}
/* Fill the structure describing the header. */
header.revision = read32 (fp, fn);
if (header.revision != MO_REVISION_NUMBER)
goto unrecognised;
header.nstrings = read32 (fp, fn);
header.orig_tab_offset = read32 (fp, fn);
header.trans_tab_offset = read32 (fp, fn);
header.hash_tab_size = read32 (fp, fn);
header.hash_tab_offset = read32 (fp, fn);
for (j = 0; j < header.nstrings; ++j)
{
static lex_pos_ty pos = { __FILE__, __LINE__ };
message_ty *mp;
char *msgid;
size_t msgid_len;
char *msgstr;
size_t msgstr_len;
/* Read the msgid. */
msgid = string32 (fp, fn, header.orig_tab_offset + j * 8, &msgid_len);
/* Read the msgstr. */
msgstr = string32 (fp, fn, header.trans_tab_offset + j * 8, &msgstr_len);
mp = message_alloc (msgid,
(strlen (msgid) + 1 < msgid_len
? msgid + strlen (msgid) + 1
: NULL),
msgstr, msgstr_len, &pos);
message_list_append (mlp, mp);
}
if (fp != stdin)
fclose (fp);
}
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