apps/language.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 Daniel Stenberg
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include <file.h>
  23
  24 #include "language.h"
  25 #include "lang.h"
  26 #include "debug.h"
  27 #include "string.h"
  28 #ifdef HAVE_LCD_BITMAP
  29 #include "viewport.h"
  30 #endif
  31
  32 /* The following header is generated by the build system and only defines
  33    MAX_LANGUAGE_SIZE to be the size of the largest currently available
  34    language! */
  35 #include "max_language_size.h"
  36
  37 /* These defines must match the initial bytes in the binary lang file */
  38 /* See tools/genlang (TODO: Use common include for both) */
  39 #define LANGUAGE_COOKIE   0x1a
  40 #define LANGUAGE_VERSION  0x06
  41 #define LANGUAGE_FLAG_RTL 0x01
  42
  43 #define HEADER_SIZE 4
  44 #define SUBHEADER_SIZE 6
  45
  46 static unsigned char language_buffer[MAX_LANGUAGE_SIZE];
  47 static unsigned char lang_options = 0;
  48
  49 void lang_init(const unsigned char *builtin, unsigned char **dest, int count)
  50 {
  51     while(count--) {
  52         *dest++ = (unsigned char *)builtin;
  53         /* advance pointer to next string */
  54         builtin += strlen((char *)builtin) + 1;
  55     }
  56 }
  57
  58 int lang_load(const char *filename, const unsigned char *builtin,
  59               unsigned char **dest, unsigned char *buffer,
  60               unsigned int user_num, int max_lang_size,
  61               unsigned int max_id)
  62 {
  63     int lang_size;
  64     int fd = open(filename, O_RDONLY);
  65     int retcode=0;
  66     unsigned char lang_header[HEADER_SIZE];
  67     unsigned char sub_header[SUBHEADER_SIZE];
  68     unsigned int id, num_strings, foffset;
  69
  70     if(fd < 0)
  71         return 1;
  72     read(fd, lang_header, HEADER_SIZE);
  73     if((lang_header[0] == LANGUAGE_COOKIE) &&
  74        (lang_header[1] == LANGUAGE_VERSION) &&
  75        (lang_header[2] == TARGET_ID)) {
  76         /* jump to the proper entry in the table of subheaders */
  77         lseek(fd, user_num * SUBHEADER_SIZE, SEEK_CUR);
  78         read(fd, sub_header, SUBHEADER_SIZE);
  79         /* read in information about the requested lang */
  80         num_strings = (sub_header[0]<<8) | sub_header[1];
  81         lang_size = (sub_header[2]<<8) | sub_header[3];
  82         foffset = (sub_header[4]<<8) | sub_header[5];
  83         if(lang_size <= max_lang_size) {
  84             /* initialize with builtin */
  85             lang_init(builtin, dest, num_strings);
  86             lseek(fd, foffset, SEEK_SET);
  87             read(fd, buffer, lang_size);
  88
  89             while(lang_size>3) {
  90                 id = ((buffer[0]<<8) | buffer[1]); /* get two-byte id */
  91                 buffer += 2;                       /* pass the id */
  92                 if(id < max_id) {
  93 #if 0
  94                     DEBUGF("%2x New: %30s ", id, buffer);
  95                     DEBUGF("Replaces: %s\n", dest[id]);
  96 #endif
  97                     dest[id] = buffer; /* point to this string */
  98                 }
  99                 while(*buffer) {               /* pass the string */
 100                     lang_size--;
 101                     buffer++;
 102                  }
 103                 lang_size-=3; /* the id and the terminating zero */
 104                 buffer++;     /* pass the terminating zero-byte */
 105             }
 106         }
 107         else {
 108             DEBUGF("Language %s too large: %d\n", filename, lang_size);
 109             retcode = 2;
 110         }
 111     }
 112     else {
 113         DEBUGF("Illegal language file\n");
 114         retcode = 3;
 115     }
 116     close(fd);
 117     lang_options = retcode ? 0 : lang_header[3];
 118     return retcode;
 119 }
 120
 121 int lang_core_load(const char *filename)
 122 {
 123     return lang_load(filename, core_language_builtin, language_strings,
 124                      language_buffer, 0, MAX_LANGUAGE_SIZE,
 125                      LANG_LAST_INDEX_IN_ARRAY);
 126 }
 127
 128 int lang_english_to_id(const char *english)
 129 {
 130     int i;
 131     unsigned char *ptr = (unsigned char *) core_language_builtin;
 132
 133     for (i = 0; i < LANG_LAST_INDEX_IN_ARRAY; i++) {
 134         if (!strcmp(ptr, english))
 135             return i;
 136         ptr += strlen((char *)ptr) + 1; /* advance pointer to next string */
 137     }
 138     return -1;
 139 }
 140
 141 int lang_is_rtl(void)
 142 {
 143     return (lang_options & LANGUAGE_FLAG_RTL) != 0;
 144 }