firmware/ajf.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Alex Gitelman
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #ifdef SIMULATOR
  20 #include <fcntl.h>
  21 #endif
  22 #include <file.h>
  23 #include "ajf.h"
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <stdbool.h>
  27 #include "debug.h"
  28
  29 static unsigned char font_buf[MAX_FONT_BUFLEN];
  30
  31 unsigned char* ajf_read_font(char* fname)
  32 {
  33     int count;
  34 #ifdef WIN32
  35     int fd = open(fname, O_RDONLY|O_BINARY);
  36 #else
  37     int fd = open(fname, O_RDONLY);
  38 #endif
  39     if (fd<0)
  40     {
  41 #ifdef SIMULATOR
  42 #ifdef WIN32
  43         DEBUGF("Failed opening font file: %d %s. ", _errno(), fname);
  44 #else
  45         DEBUGF("Failed opening font file: %d %s. ", errno, fname);
  46 #endif
  47 #endif
  48         return NULL;
  49     }
  50
  51     count = read(fd, font_buf, MAX_FONT_BUFLEN);
  52     if (count==MAX_FONT_BUFLEN) {
  53         DEBUGF("Font is larger than allocated %d bytes!\n",MAX_FONT_BUFLEN);
  54         return NULL;
  55     }
  56     close(fd);
  57
  58     if (font_buf[0]!=MAGIC1 || font_buf[1]!=MAGIC2) {
  59         DEBUGF("Bad magic word in font");
  60         return NULL;
  61     }
  62     return font_buf;
  63 }
  64
  65
  66 unsigned char* ajf_get_charbuf(unsigned char c, unsigned char* font,
  67                                int *w, int *h)
  68 {
  69     int height = READ_SHORT(&font[HEIGHT_OFFSET]);
  70     int size = READ_SHORT(&font[SIZE_OFFSET]);
  71     int chars_offset = LOOKUP_MAP_OFFSET + size*3;
  72     int rows = (height-1)/8 + 1;
  73     int first_char = READ_SHORT(&font[FIRST_CHAR_OFFSET]);
  74     int map_idx = LOOKUP_MAP_OFFSET + (c-first_char)*3;
  75     int byte_count = font[map_idx];
  76     int char_idx;
  77
  78     *h = height;
  79     *w = byte_count/rows;
  80
  81     map_idx++;
  82     char_idx = READ_SHORT(&font[map_idx]);
  83     return &font[chars_offset + char_idx];
  84 }
  85
  86 void ajf_get_charsize(unsigned char c, unsigned char* font,
  87                       int *width, int *height)
  88 {
  89     int first_char = READ_SHORT(&font[FIRST_CHAR_OFFSET]);
  90     int map_idx = LOOKUP_MAP_OFFSET + (c-first_char)*3;
  91     int rows = 1;
  92     *height = READ_SHORT(&font[HEIGHT_OFFSET]);
  93     rows = (*height-1)/8 + 1;
  94     *width = font[map_idx]/rows;
  95 }
  96
  97 int ajf_get_fontheight(unsigned char* font)
  98 {
  99     return READ_SHORT(&font[HEIGHT_OFFSET]);
 100 }