forked from MarcoBuster/Magisk
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
#include <getopt.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include "bootimgtools.h"
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int hex2int(char c) {
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int first = c / 16 - 3;
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int second = c % 16;
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int result = first * 10 + second;
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if(result > 9) result--;
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return result;
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}
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int hex2ascii(char c, char d) {
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int high = hex2int(c) * 16;
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int low = hex2int(d);
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return high+low;
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}
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void hexstr2str(char *hex, char *str) {
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char buf = 0;
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for(int i = 0, length = strlen(hex); i < length; ++i){
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if(i % 2){
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str[i / 2] = hex2ascii(buf, hex[i]);
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} else{
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buf = hex[i];
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}
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}
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}
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int hexpatch(char * image, char *from, char *to) {
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int fd = open(image, O_RDWR), patternsize = strlen(from) / 2, patchsize = strlen(to) / 2;
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off_t filesize = lseek(fd, 0, SEEK_END);
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char *file, *pattern, *patch, *start;
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file = malloc(sizeof (char) * filesize);
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pattern = malloc(sizeof (char) * patternsize);
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patch = malloc(sizeof (char) * patchsize);
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lseek(fd, 0, SEEK_SET);
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read(fd, file, filesize);
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hexstr2str(from, pattern);
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hexstr2str(to, patch);
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for (off_t i = 0; i < filesize;) {
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int j;
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for (j = 0; j < patternsize; ++j) {
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if(file[i + j] != pattern[j]) break;
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}
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if (j == patternsize) {
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fprintf(stderr, "Pattern %s found!\nPatching to %s\n", from, to);
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lseek(fd, i, SEEK_SET);
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write(fd, patch, patchsize);
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}
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if(j == 0) j = 1;
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i += j;
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}
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free(file);
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free(pattern);
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free(patch);
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close(fd);
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return 0;
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} |