73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
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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 <string.h>
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#include <stdlib.h>
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int main(int argc, char **argv){
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unsigned char *buffer = malloc(64 * 1024);
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struct stat s;
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unsigned int size_vmlinux = 0, real_size_vmlinux = 0;
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const unsigned char *magic_str = "ACME_PART_MAGIC";
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unsigned int loop;
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unsigned char *magic;
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if(argc != 3){
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printf("%s in out\n", argv[0]);
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return 1;
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}
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printf("Generating image\n");
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FILE *vmlinux = fopen(argv[1], "r");
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FILE *vmlinux_out = fopen(argv[2], "w");
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if((!vmlinux) || (!vmlinux_out)){
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printf("Error opening a file\n");
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return 1;
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}
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stat(argv[1], &s);
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size_vmlinux = s.st_size;
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real_size_vmlinux = (size_vmlinux & 0xffff0000) + 0x10000;
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printf("vmlinux = 0x%.08X / 0x%.08X\n", size_vmlinux, real_size_vmlinux);
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unsigned int t = fread(buffer, 1, 64 * 1024, vmlinux);
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for(loop = 0; loop < (64 * 1024) - sizeof(magic_str); loop++){
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if(buffer[loop] == magic_str[0]){
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if((magic = strstr(&buffer[loop], magic_str))){
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printf("Magic at 0x%.08X %p %p\n", magic - buffer, magic, buffer);
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printf("Found Magic %X%X%X%X\n",
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buffer[loop + strlen(magic_str)],
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buffer[loop + strlen(magic_str) + 2],
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buffer[loop + strlen(magic_str) + 1],
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buffer[loop + strlen(magic_str) + 3]);
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buffer[loop + strlen(magic_str)] = real_size_vmlinux >> 24;
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buffer[loop + strlen(magic_str) + 2] = (real_size_vmlinux >> 16) & 0xff;
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buffer[loop + strlen(magic_str) + 1] = (real_size_vmlinux >> 8) & 0xff;
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buffer[loop + strlen(magic_str) + 3] = (real_size_vmlinux) & 0xff;
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printf("Replaced with %.02X%.02X%.02X%.02X\n",
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buffer[loop + strlen(magic_str)],
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buffer[loop + strlen(magic_str) + 2],
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buffer[loop + strlen(magic_str) + 1],
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buffer[loop + strlen(magic_str) + 3]);
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}
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}
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}
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fwrite(buffer, 1, 64 * 1024, vmlinux_out);
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real_size_vmlinux -= 64 * 1024;
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do {
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real_size_vmlinux -= 64 * 1024;
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memset(buffer, 0, 64 * 1024);
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fread(buffer, 1, 64 * 1024, vmlinux);
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fwrite(buffer, 1, 64 * 1024, vmlinux_out);
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} while (real_size_vmlinux);
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return 0;
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}
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