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/*
* crcimg - calculates a CRC32 for each 0x20000 block of the input file
* Used for checking JFFS2 NAND FLASH installation images.
* Copyright 2007, Mitch Bradley
* License: GPL v2
* Tip 'o the hat to Richard Smith
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include "crc32.h"
#define VER_MAJOR 0
#define VER_MINOR 1
#define VER_RELEASE 0
#define EBSIZE 0x20000
static unsigned char buf[EBSIZE];
static FILE *imagefile;
static FILE *crcfile;
char outfilename[FILENAME_MAX];
void usage(const char *name)
{
printf("%s Ver: %d.%d.%d\n",name,VER_MAJOR,VER_MINOR,VER_RELEASE);
printf("usage: %s [file.img]\n", name);
printf("Creates file.crc containing CRCs for each 0x20000 byte block in file.img\n");
printf("With no arguments, filters standard input, writing CRC list to standard output\n");
exit(1);
}
int main(int argc, char *argv[])
{
int opt=0;
int option_index = 0;
size_t bytes_read=0;
static struct option long_options[]= {
{ "help", 0, 0, 'h' },
{ 0, 0, 0, 0 }
};
setbuf(stdout, NULL);
while ((opt = getopt_long(argc, argv, "h", long_options,
&option_index)) != EOF) {
switch (opt) {
case 'h':
default:
usage(argv[0]);
break;
}
}
char *filename = NULL;
if (optind < argc) {
/* Filename supplied */
filename = argv[optind++];
if ((strlen(filename) >= 4) && (strcmp(filename + strlen(filename) - 4, ".img") == 0)) {
strncpy(outfilename, filename, FILENAME_MAX);
strcpy(outfilename + strlen(filename) - 4, ".crc");
} else {
strncpy(outfilename, filename, FILENAME_MAX);
strncat(outfilename, ".crc", FILENAME_MAX - strlen(outfilename));
}
if ((imagefile = fopen(filename, "r+")) == NULL) {
perror(filename);
exit(1);
}
if ((crcfile = fopen(outfilename, "w+")) == NULL) {
perror(outfilename);
exit(1);
}
} else {
/* Use standard in/out */
imagefile = stdin;
crcfile = stdout;
}
while ((bytes_read = fread(buf, sizeof(char), EBSIZE, imagefile)) == EBSIZE) {
fprintf(crcfile, "%08lx\n", (unsigned long)~crc32(0xffffffff, buf, EBSIZE));
}
if (bytes_read != 0) {
printf("Input file size is not a multiple of 0x%x - residue 0x%x\n", EBSIZE, bytes_read);
fclose(crcfile);
exit(1);
}
fclose(crcfile);
return 0;
}
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