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 <stdio.h>
  23 #include "file.h"
  24
  25 #include "language.h"
  26 #include "lang.h"
  27 #include "debug.h"
  28 #include "string.h"
  29 #ifdef HAVE_LCD_BITMAP
  30 #include "viewport.h"
  31 #endif
  32
  33 /* The following header is generated by the build system and only defines
  34    MAX_LANGUAGE_SIZE to be the size of the largest currently available
  35    language! */
  36 #include "max_language_size.h"
  37
  38 /* These defines must match the initial bytes in the binary lang file */
  39 /* See tools/genlang (TODO: Use common include for both) */
  40 #define LANGUAGE_COOKIE   0x1a
  41 #define LANGUAGE_VERSION  0x06
  42 #define LANGUAGE_FLAG_RTL 0x01
  43
  44 #define HEADER_SIZE 4
  45 #define SUBHEADER_SIZE 6
  46
  47 static unsigned char language_buffer[MAX_LANGUAGE_SIZE];
  48 static unsigned char lang_options = 0;
  49
  50 void lang_init(const unsigned char *builtin, unsigned char **dest, int count)
  51 {
  52     while(count--) {
  53         *dest++ = (unsigned char *)builtin;
  54         /* advance pointer to next string */
  55         builtin += strlen((char *)builtin) + 1;
  56     }
  57 }
  58
  59 int lang_load(const char *filename, const unsigned char *builtin,
  60               unsigned char **dest, unsigned char *buffer,
  61               unsigned int user_num, int max_lang_size,
  62               unsigned int max_id)
  63 {
  64     int lang_size;
  65     int fd = open(filename, O_RDONLY);
  66     int retcode=0;
  67     unsigned char lang_header[HEADER_SIZE];
  68     unsigned char sub_header[SUBHEADER_SIZE];
  69     unsigned int id, foffset;
  70
  71     if(fd < 0)
  72         return 1;
  73     read(fd, lang_header, HEADER_SIZE);
  74     if((lang_header[0] == LANGUAGE_COOKIE) &&
  75        (lang_header[1] == LANGUAGE_VERSION) &&
  76        (lang_header[2] == TARGET_ID)) {
  77         /* jump to the proper entry in the table of subheaders */
  78         lseek(fd, user_num * SUBHEADER_SIZE, SEEK_CUR);
  79         read(fd, sub_header, SUBHEADER_SIZE);
  80         /* read in information about the requested lang */
  81 #if 0   /* unused */
  82         unsigned int num_strings = (sub_header[0]<<8) | sub_header[1];
  83 #endif
  84         lang_size = (sub_header[2]<<8) | sub_header[3];
  85         foffset = (sub_header[4]<<8) | sub_header[5];
  86         if(lang_size <= max_lang_size) {
  87             /* initialize with builtin */
  88             lang_init(builtin, dest, max_id);
  89             lseek(fd, foffset, SEEK_SET);
  90             read(fd, buffer, lang_size);
  91
  92             while(lang_size>3) {
  93                 id = ((buffer[0]<<8) | buffer[1]); /* get two-byte id */
  94                 buffer += 2;                       /* pass the id */
  95                 if(id < max_id) {
  96 #if 0
  97                     DEBUGF("%2x New: %30s ", id, buffer);
  98                     DEBUGF("Replaces: %s\n", dest[id]);
  99 #endif
 100                     dest[id] = buffer; /* point to this string */
 101                 }
 102                 while(*buffer) {               /* pass the string */
 103                     lang_size--;
 104                     buffer++;
 105                  }
 106                 lang_size-=3; /* the id and the terminating zero */
 107                 buffer++;     /* pass the terminating zero-byte */
 108             }
 109         }
 110         else {
 111             DEBUGF("Language %s too large: %d\n", filename, lang_size);
 112             retcode = 2;
 113         }
 114     }
 115     else {
 116         DEBUGF("Illegal language file\n");
 117         retcode = 3;
 118     }
 119     close(fd);
 120     lang_options = retcode ? 0 : lang_header[3];
 121     return retcode;
 122 }
 123
 124 int lang_core_load(const char *filename)
 125 {
 126     return lang_load(filename, core_language_builtin, language_strings,
 127                      language_buffer, 0, MAX_LANGUAGE_SIZE,
 128                      LANG_LAST_INDEX_IN_ARRAY);
 129 }
 130
 131 int lang_english_to_id(const char *english)
 132 {
 133     int i;
 134     unsigned char *ptr = (unsigned char *) core_language_builtin;
 135
 136     for (i = 0; i < LANG_LAST_INDEX_IN_ARRAY; i++) {
 137         if (!strcmp(ptr, english))
 138             return i;
 139         ptr += strlen((char *)ptr) + 1; /* advance pointer to next string */
 140     }
 141     return -1;
 142 }
 143
 144 int lang_is_rtl(void)
 145 {
 146     return (lang_options & LANGUAGE_FLAG_RTL) != 0;
 147 }