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/* wptNLS.cpp - W32 Native Language Support |
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* Copyright (C) 2001, 2002, 2003 Timo Schulz |
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* Copyright (C) 1995-1999 Free Software Foundation, Inc. |
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* |
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* This code based on the simple-gettext.c code from the GnuPG |
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* by Ulrich Drepper. |
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* |
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* WinPT is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* WinPT 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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* 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 WinPT; if not, write to the Free Software Foundation, |
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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/* x-todo-status: OK */ |
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|
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#include <stdio.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 <windows.h> |
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|
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#include "wptTypes.h" |
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#include "wptNLS.h" |
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|
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|
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/* Missing W32 functions. */ |
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static char * |
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stpcpy( char *a,const char *b ) |
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{ |
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while( *b ) |
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*a++ = *b++; |
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*a = 0; |
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return (char*)a; |
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} |
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|
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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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|
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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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|
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|
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/* Header for binary .mo file format. */ |
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struct mo_file_header { |
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u32 magic; /* The magic number. */ |
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u32 revision; /* The revision number of the file format. */ |
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u32 nstrings; /* The number of strings pairs. */ |
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u32 orig_tab_offset; /* Offset of table with start offsets of original |
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strings. */ |
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u32 trans_tab_offset; /* Offset of table with start offsets of translation |
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strings. */ |
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u32 hash_tab_size; /* Size of hashing table. */ |
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u32 hash_tab_offset; /* Offset of first hashing entry. */ |
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}; |
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|
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struct string_desc { |
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u32 length; /* Length of addressed string. */ |
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u32 offset; /* Offset of string in file. */ |
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}; |
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|
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struct loaded_domain { |
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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; |
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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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|
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static struct loaded_domain *the_domain; |
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|
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static 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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|
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#define SWAPIT(flag, data) ((flag) ? do_swap_u32(data) : (data) ) |
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|
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|
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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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|
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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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|
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static u32 |
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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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|
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hval = 0; |
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while (*str != '\0') { |
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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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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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} /* hash_string */ |
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|
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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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|
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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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|
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data = (struct mo_file_header *) 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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|
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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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} |
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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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|
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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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|
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domain = (struct loaded_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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|
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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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|
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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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|
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/* allocate an array to keep track of code page mappings */ |
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domain->mapped = (char *)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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|
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return domain; |
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} /* load_domain */ |
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|
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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 shoudl 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, const char *nls_dir ) |
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{ |
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struct loaded_domain *domain = NULL; |
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|
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if( filename && *filename ) { |
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if( filename[0] == '/' |
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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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) { |
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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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|
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dir = strdup( nls_dir ); |
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if( dir && (buf= (char *)malloc(strlen(dir)+strlen(filename)+1+3+1)) ) { |
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strcpy(stpcpy(stpcpy(stpcpy( buf, dir),"/"), filename),".mo"); |
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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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|
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if( the_domain ) { |
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free( the_domain->data ); |
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free( the_domain->mapped ); |
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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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} /* set_gettext_file */ |
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|
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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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char *p = domain->data + SWAPIT(domain->must_swap, |
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domain->trans_tab[idx].offset); |
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if( !domain->mapped[idx] ) { |
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domain->mapped[idx] = 1; |
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} |
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return (const char*)p; |
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} /* get_string */ |
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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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|
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if( !(domain = the_domain) ) |
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goto not_found; |
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|
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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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|
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if ( !nstr ) /* Hash table entry is empty. */ |
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goto not_found; |
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|
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|
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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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|
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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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|
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return get_string( domain, nstr-1 ); |
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} /* NOTREACHED */ |
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} |
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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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|
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act = (bottom + top) / 2; |
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cmp_val = strcmp(msgid, domain->data + 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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|
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not_found: |
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return msgid; |
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} /* gettext */ |
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