tools/mkmmimg.c

   1 /*
   2  * CRC32 computation tool and Milkymist image file writer
   3  * (c) 2009, 2010, 2012 Sebastien Bourdeauducq
   4  * Released under GNU GPL v3
   5  * This file is part of Milkymist.
   6  */
   7
   8 /* crc32.c -- compute the CRC-32 of a data stream
   9  * Copyright (C) 1995-1998 Mark Adler
  10  * For conditions of distribution and use, see copyright notice in zlib.h
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/mman.h>
  18 #include <string.h>
  19 #include <fcntl.h>
  20 #include <unistd.h>
  21
  22 const unsigned int crc_table[256] = {
  23         0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
  24         0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
  25         0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
  26         0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
  27         0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
  28         0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
  29         0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
  30         0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
  31         0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
  32         0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
  33         0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
  34         0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
  35         0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
  36         0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
  37         0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
  38         0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
  39         0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
  40         0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
  41         0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
  42         0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
  43         0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
  44         0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
  45         0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
  46         0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
  47         0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
  48         0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
  49         0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
  50         0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
  51         0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
  52         0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
  53         0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
  54         0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
  55         0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
  56         0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
  57         0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
  58         0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
  59         0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
  60         0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
  61         0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
  62         0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
  63         0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
  64         0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
  65         0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
  66         0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
  67         0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
  68         0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
  69         0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
  70         0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
  71         0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
  72         0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
  73         0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
  74         0x2d02ef8dL
  75 };
  76
  77 #define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
  78 #define DO2(buf)  DO1(buf); DO1(buf);
  79 #define DO4(buf)  DO2(buf); DO2(buf);
  80 #define DO8(buf)  DO4(buf); DO4(buf);
  81
  82 static unsigned int crc32(const unsigned char *buffer, unsigned int len)
  83 {
  84         unsigned int crc;
  85         crc = 0;
  86         crc = crc ^ 0xffffffffL;
  87         while(len >= 8) {
  88                 DO8(buffer);
  89                 len -= 8;
  90         }
  91         if(len) do {
  92                 DO1(buffer);
  93         } while(--len);
  94         return crc ^ 0xffffffffL;
  95 }
  96
  97 int main(int argc, char *argv[])
  98 {
  99         int fd, fd_out;
 100         unsigned char *buffer;
 101         unsigned int length;
 102         unsigned int crc;
 103
 104         if(((argc != 2) && (argc != 3) && (argc != 4))
 105                 || ((argc > 2) && (strcmp(argv[2], "write")))) {
 106                 fprintf(stderr, "Usage: mkmmimg <filename> [write] [dest]\n");
 107                 return 1;
 108         }
 109
 110         fd = open(argv[1], O_RDONLY);
 111         if(fd == -1) {
 112                 perror("open");
 113                 return 1;
 114         }
 115
 116         length = lseek(fd, 0, SEEK_END);
 117         lseek(fd, 0, SEEK_SET);
 118
 119         buffer = mmap(NULL, length, PROT_READ, MAP_SHARED, fd, 0);
 120         if(!buffer) {
 121                 perror("mmap");
 122                 close(fd);
 123                 return 1;
 124         }
 125         crc = crc32(buffer, length);
 126         printf("CRC32 (%s): %08x\n", argv[1], crc);
 127
 128         if(argc == 3) {
 129                 /* Write the CRC32 in big endian at the end of the file */
 130                 char b[4];
 131
 132                 fd_out = open(argv[1], O_WRONLY|O_APPEND);
 133                 if(fd_out == -1) {
 134                         perror("open");
 135                         return 1;
 136                 }
 137                 b[0] = (crc & 0xff000000) >> 24;
 138                 b[1] = (crc & 0x00ff0000) >> 16;
 139                 b[2] = (crc & 0x0000ff00) >> 8;
 140                 b[3] = (crc & 0x000000ff) >> 0;
 141                 write(fd_out, &b[0], 4);
 142                 close(fd_out);
 143         }
 144
 145         if(argc == 4) {
 146                 /* Write a new file prepended with the size and CRC */
 147                 char b[4];
 148
 149                 fd_out = open(argv[3], O_WRONLY|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
 150                 if(fd_out == -1) {
 151                         perror("open");
 152                         return 1;
 153                 }
 154                 b[0] = (length & 0xff000000) >> 24;
 155                 b[1] = (length & 0x00ff0000) >> 16;
 156                 b[2] = (length & 0x0000ff00) >> 8;
 157                 b[3] = (length & 0x000000ff) >> 0;
 158                 write(fd_out, &b[0], 4);
 159                 b[0] = (crc & 0xff000000) >> 24;
 160                 b[1] = (crc & 0x00ff0000) >> 16;
 161                 b[2] = (crc & 0x0000ff00) >> 8;
 162                 b[3] = (crc & 0x000000ff) >> 0;
 163                 write(fd_out, &b[0], 4);
 164                 write(fd_out, buffer, length);
 165                 close(fd_out);
 166         }
 167
 168         munmap(buffer, length);
 169         close(fd);
 170
 171         return 0;
 172 }