FS#8961 - Anti-Aliased Fonts.
[kugel-rb.git] / utils / AMS / hacking / extract_fw.c
blobbee6a234c483429b31344b36bc78533410262e4c
1 /*
3 extract_fw.c - extract the main firmware image from a Sansa V2 (AMS) firmware
4 file
6 Copyright (C) Dave Chapman 2008
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <stdint.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <fcntl.h>
31 #include <unistd.h>
32 #include <string.h>
35 /* Win32 compatibility */
36 #ifndef O_BINARY
37 #define O_BINARY 0
38 #endif
41 static off_t filesize(int fd) {
42 struct stat buf;
44 if (fstat(fd,&buf) < 0) {
45 perror("[ERR] Checking filesize of input file");
46 return -1;
47 } else {
48 return(buf.st_size);
52 static uint32_t get_uint32le(unsigned char* p)
54 return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
57 void usage(void)
59 printf("Usage: extract_fw <firmware file> <output file>\n");
61 exit(1);
64 int main(int argc, char* argv[])
66 char *infile, *outfile;
67 int fdin, fdout;
68 off_t len;
69 uint32_t n;
70 unsigned char* buf;
71 uint32_t firmware_size;
73 if(argc != 3) {
74 usage();
77 infile = argv[1];
78 outfile = argv[2];
80 /* Open the firmware file */
81 fdin = open(infile,O_RDONLY|O_BINARY);
83 if (fdin < 0) {
84 fprintf(stderr,"[ERR] Could not open %s for reading\n",infile);
85 return 1;
88 if ((len = filesize(fdin)) < 0)
89 return 1;
91 /* We will need no more memory than the total size plus the bootloader size
92 padded to a boundary */
93 if ((buf = malloc(len)) == NULL) {
94 fprintf(stderr,"[ERR] Could not allocate buffer for input file (%d bytes)\n",(int)len);
95 return 1;
98 n = read(fdin, buf, len);
100 if (n != (uint32_t)len) {
101 fprintf(stderr,"[ERR] Could not read firmware file\n");
102 return 1;
105 close(fdin);
107 /* Get the firmware size */
108 if (get_uint32le(&buf[0x04])==0x0000f000)
109 firmware_size = get_uint32le(&buf[0x10]); /* v2 format */
110 else
111 firmware_size = get_uint32le(&buf[0x0c]); /* v1 format */
113 fdout = open(outfile, O_CREAT|O_TRUNC|O_WRONLY|O_BINARY,0666);
115 if (fdout < 0) {
116 fprintf(stderr,"[ERR] Could not open %s for writing\n",outfile);
117 return 1;
120 n = write(fdout, buf + 0x400, firmware_size);
122 if (n != (uint32_t)firmware_size) {
123 fprintf(stderr,"[ERR] Could not write firmware block\n");
124 return 1;
127 /* Clean up */
128 close(fdout);
129 free(buf);
131 return 0;