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  0x05
  41 #define LANGUAGE_FLAG_RTL 0x01
  42
  43 #define HEADER_SIZE 4
  44
  45 static unsigned char language_buffer[MAX_LANGUAGE_SIZE];
  46 static unsigned char lang_options = 0;
  47
  48 void lang_init(const unsigned char *builtin, unsigned char **dest, int count)
  49 {
  50     while(count--) {
  51         *dest++ = (unsigned char *)builtin;
  52         /* advance pointer to next string */
  53         builtin += strlen((char *)builtin) + 1;
  54     }
  55 }
  56
  57 int lang_load(const char *filename)
  58 {
  59     int fsize;
  60     int fd = open(filename, O_RDONLY);
  61     int retcode=0;
  62     unsigned char lang_header[HEADER_SIZE];
  63     if(fd < 0)
  64         return 1;
  65     fsize = filesize(fd) - HEADER_SIZE;
  66     if(fsize <= MAX_LANGUAGE_SIZE) {
  67         read(fd, lang_header, HEADER_SIZE);
  68         if((lang_header[0] == LANGUAGE_COOKIE) &&
  69            (lang_header[1] == LANGUAGE_VERSION) &&
  70            (lang_header[2] == TARGET_ID)) {
  71             read(fd, language_buffer, MAX_LANGUAGE_SIZE);
  72             unsigned char *ptr = language_buffer;
  73             int id;
  74             /* initialize with builtin */
  75             lang_init(language_builtin, language_strings,
  76                       LANG_LAST_INDEX_IN_ARRAY);
  77
  78             while(fsize>3) {
  79                 id = (ptr[0]<<8) | ptr[1];  /* get two-byte id */
  80                 ptr+=2;                     /* pass the id */
  81                 if(id < LANG_LAST_INDEX_IN_ARRAY) {
  82 #if 0
  83                     DEBUGF("%2x New: %30s ", id, ptr);
  84                     DEBUGF("Replaces: %s\n", language_strings[id]);
  85 #endif
  86                     language_strings[id] = ptr; /* point to this string */
  87                 }
  88                 while(*ptr) {               /* pass the string */
  89                     fsize--;
  90                     ptr++;
  91                 }
  92                 fsize-=3; /* the id and the terminating zero */
  93                 ptr++;       /* pass the terminating zero-byte */
  94             }
  95         }
  96         else {
  97             DEBUGF("Illegal language file\n");
  98             retcode = 2;
  99         }
 100     }
 101     else {
 102         DEBUGF("Language %s too large: %d\n", filename, fsize);
 103         retcode = 3;
 104     }
 105     close(fd);
 106     lang_options = retcode ? 0 : lang_header[3];
 107     return retcode;
 108 }
 109
 110 int lang_english_to_id(const char *english)
 111 {
 112     int i;
 113     unsigned char *ptr = (unsigned char *) language_builtin;
 114
 115     for (i = 0; i < LANG_LAST_INDEX_IN_ARRAY; i++) {
 116         if (!strcmp(ptr, english))
 117             return i;
 118         ptr += strlen((char *)ptr) + 1; /* advance pointer to next string */
 119     }
 120     return -1;
 121 }
 122
 123 int lang_is_rtl(void)
 124 {
 125     return (lang_options & LANGUAGE_FLAG_RTL) != 0;
 126 }