firmware/extract.c

   1 /* firmware/extract.c - tool for extracting firmwares out of linux
   2  * binary drivers
   3  *
   4  * --------------------------------------------------------------------
   5  *
   6  * Copyright (C) 2003  ACX100 Open Source Project
   7  *
   8  *   The contents of this file are subject to the Mozilla Public
   9  *   License Version 1.1 (the "License"); you may not use this file
  10  *   except in compliance with the License. You may obtain a copy of
  11  *   the License at http://www.mozilla.org/MPL/
  12  *
  13  *   Software distributed under the License is distributed on an "AS
  14  *   IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  15  *   implied. See the License for the specific language governing
  16  *   rights and limitations under the License.
  17  *
  18  *   Alternatively, the contents of this file may be used under the
  19  *   terms of the GNU Public License version 2 (the "GPL"), in which
  20  *   case the provisions of the GPL are applicable instead of the
  21  *   above.  If you wish to allow the use of your version of this file
  22  *   only under the terms of the GPL and not to allow others to use
  23  *   your version of this file under the MPL, indicate your decision
  24  *   by deleting the provisions above and replace them with the notice
  25  *   and other provisions required by the GPL.  If you do not delete
  26  *   the provisions above, a recipient may use your version of this
  27  *   file under either the MPL or the GPL.
  28  *
  29  * --------------------------------------------------------------------
  30  *
  31  * Inquiries regarding the ACX100 Open Source Project can be
  32  * made directly to:
  33  *
  34  * acx100-users@lists.sf.net
  35  * http://acx100.sf.net
  36  *
  37  * --------------------------------------------------------------------
  38  */
  39
  40 /* TODO:
  41  *      - get the firmware size from the debug symbols in the binary
  42  *      - check for version string, not only 4 first bytes
  43  */
  44
  45 #define _GNU_SOURCE
  46 #include <stdio.h>
  47 #include <string.h>
  48 #include <stdlib.h>
  49 #include <sys/types.h>
  50 #include <sys/stat.h>
  51 #include <unistd.h>
  52
  53 #define FRMWR_SIZE 29612
  54 #define NR_COLS 10
  55
  56 int main(int argc, char *argv[])
  57 {
  58         FILE *driver;
  59         unsigned char c;
  60         int size, pos, file_size;
  61         unsigned char *mem, *begin;
  62
  63         /* this is the signature for firmware version 1.5.0 which is present in all the linux binary drivers. */
  64         unsigned char signature[] = {0x58, 0xb2, 0x24, 0x00};
  65
  66         /* check the arguments */
  67         if (argc != 2)
  68         {
  69                 fprintf(stderr, "Wrong call arguments.\n");
  70                 fprintf(stderr, "USAGE: extract binary_driver.o\n");
  71                 fprintf(stderr, " The firmware will be extracted, and will be written to stdout.\n");
  72                 exit(1);
  73         }
  74
  75         /* try to open the file */
  76         driver = fopen(argv[1], "r");
  77         if(!driver)
  78         {
  79                 fprintf(stderr, "ERROR: couldn't open or find given binary file %s to extract firmware image from it, aborting!\n", argv[1]);
  80                 exit(1);
  81         }
  82
  83         /* get file stats */
  84         fseek(driver, 0, SEEK_END);
  85         file_size = ftell(driver);
  86         fseek(driver, 0, SEEK_SET);
  87
  88         /* alloc buffer to hold complete file */
  89         mem = malloc(file_size);
  90         if(!mem)
  91         {
  92                 fprintf(stderr, "Could not allocate enough memory\n");
  93                 exit(1);
  94         }
  95
  96         /* read the complete file */
  97         size = fread(mem, 1, file_size, driver);
  98         if ( size != file_size)
  99         {
 100                 fprintf(stderr, "Was unable to read complete file (%i, %i)\n", size, file_size);
 101                 exit(1);
 102         }
 103
 104
 105         /* find the firmware */
 106         begin = memmem(mem, file_size, signature, 4);
 107         if(!begin)
 108         {
 109                 fprintf(stderr, "Firmware was not found\n");
 110                 exit(1);
 111         }
 112
 113         /* start processing the firmware */
 114         pos = 0;
 115         do {
 116                 c = begin[pos];
 117                 printf("%c", c);
 118                 pos++;
 119         } while(pos != FRMWR_SIZE);
 120
 121         free(driver);
 122
 123         exit(0);
 124 }
 125