148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
#include <stdio.h>
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#include <getopt.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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char devpath[FILENAME_MAX];
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char targetpath[FILENAME_MAX];
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int firstSector = -1;
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long offset = -1;
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int cntSectors = -1;
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int sectSize = 4096;
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void printUsage();
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int scratch(int dev, int image,int sector,int size);
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int main(int argc, char **argv) {
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int ch;
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while ((ch = getopt(argc, argv, "o:c:s:h")) != -1){
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switch (ch){
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case 'o':
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offset = strtol(optarg, NULL, 0);
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break;
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case 'b':
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offset = strtol(optarg, NULL, 0);
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break;
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case 'c':
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cntSectors = strtol(optarg, NULL, 0);
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break;
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case 's':
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sectSize = strtol(optarg, NULL, 0);
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case 'h':
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printUsage();
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return 0;
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}
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}
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if (optind != (argc-2)){
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printUsage();
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return -1;
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}
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strncpy(devpath, argv[optind], sizeof(devpath));
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strncpy(targetpath, argv[optind+1], sizeof(targetpath));
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if ((offset != -1) && (firstSector != -1)){
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printUsage();
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printf("only first sector OR offset may be given!\n");
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}
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if (offset != -1)
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firstSector = (int)(offset / sectSize);
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if (firstSector == -1)
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firstSector = 0;
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int dev = open(devpath, O_RDONLY);
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if (dev == -1){
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printf("could not open device %s\n", devpath);
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return -2;
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}
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long devsize = lseek(dev, 0, SEEK_END);
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if (cntSectors == -1)
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cntSectors = (int)(devsize / sectSize);
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int target = open(devpath, O_RDONLY);
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if (target == -1){
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printf("could not open target image %s\n", targetpath);
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close(dev);
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return -3;
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}
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printf("target (image file): %s\n", targetpath);
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printf("device: %s\n", devpath);
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printf("sector size: %i\n", sectSize);
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printf("offset: 0x%08lx\n", ((long)firstSector * sectSize));
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printf("first sector: %i\n", firstSector);
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printf("sectors: %i\n", cntSectors);
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for (int n=0;n<cntSectors;n++){
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scratch(dev, target, firstSector + n, sectSize);
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}
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close(target);
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close(dev);
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return 0;
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}
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int scratch(int dev, int image,int sector,int size){
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char p[size];
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long offset = (long)sector * size;
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for (int n = 0; n < 16; n++){
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printf("\r#%08i 0x%08lX %i", sector, offset, n);
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if (lseek(dev, offset, SEEK_SET) != offset){
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printf("\ncould not seek (dev).\n");
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return -1;
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}
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if (lseek(image, offset, SEEK_SET) != offset){
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printf("\ncould not seek (image).\n");
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return -1;
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}
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int nread = read(dev, p, size);
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if (nread == -1){
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continue;
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} else {
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if (nread < size) {
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printf("\nshort read!\n");
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}
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write(image, p, nread);
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return size;
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}
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}
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}
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void printUsage(){
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printf("usage: ddscratch ( [-b <firstsector> ] | [-o <offset>] ) [-c <sectorcount>] [-s <sectorsize>] <path> <target>\n");
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}
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