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