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439 lines
11 KiB
C
439 lines
11 KiB
C
/* simple-gettext.c - a simplified version of gettext.
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* Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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/* This is a simplified version of gettext written by Ulrich Drepper.
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* It is used for the Win32 version of GnuPG beucase all the overhead
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* of gettext is not needed and we have to do some special Win32 stuff.
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* I decided that this is far easier than to tweak gettext for the special
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* cases (I tried it but it is a lot of code). wk 15.09.99
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*/
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#include <config.h>
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#ifdef USE_SIMPLE_GETTEXT
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#if !defined (_WIN32) && !defined (__CYGWIN32__)
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#error This file can only be used under Windows or Cygwin32
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "util.h"
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#include "sysutils.h"
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/* The magic number of the GNU message catalog format. */
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#define MAGIC 0x950412de
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#define MAGIC_SWAPPED 0xde120495
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/* Revision number of the currently used .mo (binary) file format. */
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#define MO_REVISION_NUMBER 0
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/* Header for binary .mo file format. */
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struct mo_file_header
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{
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/* The magic number. */
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u32 magic;
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/* The revision number of the file format. */
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u32 revision;
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/* The number of strings pairs. */
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u32 nstrings;
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/* Offset of table with start offsets of original strings. */
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u32 orig_tab_offset;
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/* Offset of table with start offsets of translation strings. */
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u32 trans_tab_offset;
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/* Size of hashing table. */
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u32 hash_tab_size;
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/* Offset of first hashing entry. */
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u32 hash_tab_offset;
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};
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struct string_desc
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{
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/* Length of addressed string. */
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u32 length;
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/* Offset of string in file. */
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u32 offset;
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};
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struct overflow_space_s
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{
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struct overflow_space_s *next;
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u32 idx;
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char d[1];
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};
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struct loaded_domain
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{
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char *data;
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int must_swap;
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u32 nstrings;
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char *mapped; /* 0 = not yet mapped, 1 = mapped,
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2 = mapped to
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overflow space */
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struct overflow_space_s *overflow_space;
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struct string_desc *orig_tab;
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struct string_desc *trans_tab;
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u32 hash_size;
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u32 *hash_tab;
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};
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static struct loaded_domain *the_domain;
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static __inline__ u32
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do_swap_u32( u32 i )
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{
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return (i << 24) | ((i & 0xff00) << 8) | ((i >> 8) & 0xff00) | (i >> 24);
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}
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#define SWAPIT(flag, data) ((flag) ? do_swap_u32(data) : (data) )
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/* We assume to have `unsigned long int' value with at least 32 bits. */
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#define HASHWORDBITS 32
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/* The so called `hashpjw' function by P.J. Weinberger
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[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
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1986, 1987 Bell Telephone Laboratories, Inc.] */
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static __inline__ ulong
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hash_string( const char *str_param )
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{
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unsigned long int hval, g;
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const char *str = str_param;
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hval = 0;
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while (*str != '\0')
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{
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hval <<= 4;
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hval += (unsigned long int) *str++;
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g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
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if (g != 0)
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{
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hval ^= g >> (HASHWORDBITS - 8);
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hval ^= g;
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}
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}
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return hval;
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}
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static struct loaded_domain *
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load_domain( const char *filename )
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{
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FILE *fp;
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size_t size;
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struct stat st;
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struct mo_file_header *data = NULL;
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struct loaded_domain *domain = NULL;
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size_t to_read;
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char *read_ptr;
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fp = fopen( filename, "rb" );
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if( !fp )
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return NULL; /* can't open the file */
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/* we must know about the size of the file */
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if( fstat( fileno(fp ), &st )
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|| (size = (size_t)st.st_size) != st.st_size
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|| size < sizeof (struct mo_file_header) ) {
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fclose( fp );
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return NULL;
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}
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data = malloc( size );
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if( !data ) {
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fclose( fp );
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return NULL; /* out of memory */
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}
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to_read = size;
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read_ptr = (char *) data;
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do {
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long int nb = fread( read_ptr, 1, to_read, fp );
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if( nb < to_read ) {
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fclose (fp);
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free(data);
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return NULL; /* read error */
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}
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read_ptr += nb;
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to_read -= nb;
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} while( to_read > 0 );
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fclose (fp);
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/* Using the magic number we can test whether it really is a message
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* catalog file. */
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if( data->magic != MAGIC && data->magic != MAGIC_SWAPPED ) {
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/* The magic number is wrong: not a message catalog file. */
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free( data );
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return NULL;
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}
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domain = calloc( 1, sizeof *domain );
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if( !domain ) {
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free( data );
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return NULL;
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}
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domain->data = (char *) data;
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domain->must_swap = data->magic != MAGIC;
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/* Fill in the information about the available tables. */
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switch( SWAPIT(domain->must_swap, data->revision) ) {
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case 0:
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domain->nstrings = SWAPIT(domain->must_swap, data->nstrings);
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domain->orig_tab = (struct string_desc *)
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((char *) data + SWAPIT(domain->must_swap, data->orig_tab_offset));
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domain->trans_tab = (struct string_desc *)
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((char *) data + SWAPIT(domain->must_swap, data->trans_tab_offset));
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domain->hash_size = SWAPIT(domain->must_swap, data->hash_tab_size);
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domain->hash_tab = (u32 *)
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((char *) data + SWAPIT(domain->must_swap, data->hash_tab_offset));
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break;
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default: /* This is an invalid revision. */
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free( data );
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free( domain );
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return NULL;
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}
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/* Allocate an array to keep track of code page mappings. */
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domain->mapped = calloc( 1, domain->nstrings );
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if( !domain->mapped ) {
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free( data );
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free( domain );
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return NULL;
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}
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return domain;
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}
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/****************
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* Set the file used for translations. Pass a NULL to disable
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* translation. A new filename may be set at anytime.
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* WARNING: After changing the filename you should not access any data
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* retrieved by gettext().
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*/
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int
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set_gettext_file( const char *filename )
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{
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struct loaded_domain *domain = NULL;
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if( filename && *filename ) {
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if( filename[0] == '/'
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#ifdef HAVE_DRIVE_LETTERS
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|| ( isalpha(filename[0])
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&& filename[1] == ':'
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&& (filename[2] == '/' || filename[2] == '\\') )
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#endif
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) {
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/* absolute path - use it as is */
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domain = load_domain( filename );
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}
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else { /* relative path - append ".mo" and get dir from the environment */
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char *buf = NULL;
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char *dir;
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char *p;
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dir = read_w32_registry_string( NULL,
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"Control Panel\\Mingw32\\NLS",
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"MODir" );
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if( dir && (buf=malloc(strlen(dir)+strlen(filename)+1+3+1)) ) {
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strcpy(stpcpy(stpcpy(stpcpy( buf, dir),"\\"), filename),".mo");
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/* Better make sure that we don't mix forward and
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backward slashes. It seems that some Windoze
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versions don't accept this. */
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for (p=buf; *p; p++)
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{
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if (*p == '/')
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*p = '\\';
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}
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domain = load_domain( buf );
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free(buf);
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}
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free(dir);
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}
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if( !domain )
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return -1;
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}
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if( the_domain ) {
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struct overflow_space_s *os, *os2;
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free( the_domain->data );
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free( the_domain->mapped );
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for (os=the_domain->overflow_space; os; os = os2) {
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os2 = os->next;
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free (os);
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}
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free( the_domain );
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the_domain = NULL;
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}
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the_domain = domain;
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return 0;
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}
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static const char*
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get_string( struct loaded_domain *domain, u32 idx )
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{
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struct overflow_space_s *os;
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char *p;
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p = domain->data + SWAPIT(domain->must_swap, domain->trans_tab[idx].offset);
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if (!domain->mapped[idx])
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{
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size_t plen, buflen;
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char *buf;
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domain->mapped[idx] = 1;
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plen = strlen (p);
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buf = utf8_to_native (p, plen, -1);
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buflen = strlen (buf);
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if (buflen <= plen)
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strcpy (p, buf);
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else
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{
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/* There is not enough space for the translation - store it
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in the overflow_space else and mark that in the mapped
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array. Because we expect that this won't happen too
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often, we use a simple linked list. */
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os = malloc (sizeof *os + buflen);
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if (os)
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{
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os->idx = idx;
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strcpy (os->d, buf);
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os->next = domain->overflow_space;
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domain->overflow_space = os;
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p = os->d;
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}
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else
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p = "ERROR in GETTEXT MALLOC";
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}
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xfree (buf);
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}
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else if (domain->mapped[idx] == 2)
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{ /* We need to get the string from the overflow_space. */
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for (os=domain->overflow_space; os; os = os->next)
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if (os->idx == idx)
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return (const char*)os->d;
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p = "ERROR in GETTEXT\n";
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}
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return (const char*)p;
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}
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const char *
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gettext( const char *msgid )
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{
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struct loaded_domain *domain;
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size_t act = 0;
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size_t top, bottom;
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if( !(domain = the_domain) )
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goto not_found;
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/* Locate the MSGID and its translation. */
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if( domain->hash_size > 2 && domain->hash_tab ) {
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/* Use the hashing table. */
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u32 len = strlen (msgid);
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u32 hash_val = hash_string (msgid);
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u32 idx = hash_val % domain->hash_size;
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u32 incr = 1 + (hash_val % (domain->hash_size - 2));
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u32 nstr = SWAPIT (domain->must_swap, domain->hash_tab[idx]);
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if ( !nstr ) /* Hash table entry is empty. */
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goto not_found;
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if( SWAPIT(domain->must_swap,
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domain->orig_tab[nstr - 1].length) == len
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&& !strcmp( msgid,
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domain->data + SWAPIT(domain->must_swap,
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domain->orig_tab[nstr - 1].offset)) )
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return get_string( domain, nstr - 1 );
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for(;;) {
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if (idx >= domain->hash_size - incr)
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idx -= domain->hash_size - incr;
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else
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idx += incr;
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nstr = SWAPIT(domain->must_swap, domain->hash_tab[idx]);
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if( !nstr )
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goto not_found; /* Hash table entry is empty. */
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if ( SWAPIT(domain->must_swap,
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domain->orig_tab[nstr - 1].length) == len
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&& !strcmp (msgid,
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domain->data + SWAPIT(domain->must_swap,
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domain->orig_tab[nstr - 1].offset)))
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return get_string( domain, nstr-1 );
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}
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/* NOTREACHED */
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}
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/* Now we try the default method: binary search in the sorted
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array of messages. */
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bottom = 0;
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top = domain->nstrings;
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while( bottom < top ) {
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int cmp_val;
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act = (bottom + top) / 2;
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cmp_val = strcmp(msgid, domain->data
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+ SWAPIT(domain->must_swap,
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domain->orig_tab[act].offset));
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if (cmp_val < 0)
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top = act;
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else if (cmp_val > 0)
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bottom = act + 1;
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else
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return get_string( domain, act );
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}
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not_found:
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return msgid;
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}
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#if 0
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unsigned int cp1, cp2;
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cp1 = GetConsoleCP();
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cp2 = GetConsoleOutputCP();
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log_info("InputCP=%u OutputCP=%u\n", cp1, cp2 );
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if( !SetConsoleOutputCP( 1252 ) )
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log_info("SetConsoleOutputCP failed: %s\n", w32_strerror (0));
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cp1 = GetConsoleCP();
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cp2 = GetConsoleOutputCP();
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log_info("InputCP=%u OutputCP=%u after switch1\n", cp1, cp2 );
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#endif
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#endif /* USE_SIMPLE_GETTEXT */
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