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hardware_samsung/dtbhtool/unpackbootimg.c

223 lines
6.6 KiB

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <libgen.h>
#include "mincrypt/sha.h"
#include "bootimg.h"
typedef unsigned char byte;
int read_padding(FILE* f, unsigned itemsize, int pagesize)
{
byte* buf = (byte*)malloc(sizeof(byte) * pagesize);
unsigned pagemask = pagesize - 1;
unsigned count;
if((itemsize & pagemask) == 0) {
free(buf);
return 0;
}
count = pagesize - (itemsize & pagemask);
fread(buf, count, 1, f);
free(buf);
return count;
}
void write_string_to_file(char* file, char* string)
{
FILE* f = fopen(file, "w");
fwrite(string, strlen(string), 1, f);
fwrite("\n", 1, 1, f);
fclose(f);
}
int usage() {
printf("usage: unpackbootimg\n");
printf("\t-i|--input boot.img\n");
printf("\t[ -o|--output output_directory]\n");
printf("\t[ -p|--pagesize <size-in-hexadecimal> ]\n");
return 0;
}
int main(int argc, char** argv)
{
char tmp[PATH_MAX];
char* directory = "./";
char* filename = NULL;
int pagesize = 0;
argc--;
argv++;
while(argc > 0){
char *arg = argv[0];
char *val = argv[1];
argc -= 2;
argv += 2;
if(!strcmp(arg, "--input") || !strcmp(arg, "-i")) {
filename = val;
} else if(!strcmp(arg, "--output") || !strcmp(arg, "-o")) {
directory = val;
} else if(!strcmp(arg, "--pagesize") || !strcmp(arg, "-p")) {
pagesize = strtoul(val, 0, 16);
} else {
return usage();
}
}
if (filename == NULL) {
return usage();
}
int total_read = 0;
FILE* f = fopen(filename, "rb");
boot_img_hdr header;
//printf("Reading header...\n");
int i;
for (i = 0; i <= 512; i++) {
fseek(f, i, SEEK_SET);
fread(tmp, BOOT_MAGIC_SIZE, 1, f);
if (memcmp(tmp, BOOT_MAGIC, BOOT_MAGIC_SIZE) == 0)
break;
}
total_read = i;
if (i > 512) {
printf("Android boot magic not found.\n");
return 1;
}
fseek(f, i, SEEK_SET);
printf("Android magic found at: %d\n", i);
fread(&header, sizeof(header), 1, f);
printf("BOARD_KERNEL_CMDLINE %s\n", header.cmdline);
printf("BOARD_KERNEL_BASE %08x\n", header.kernel_addr - 0x00008000);
printf("BOARD_RAMDISK_OFFSET %08x\n", header.ramdisk_addr - header.kernel_addr + 0x00008000);
printf("BOARD_SECOND_OFFSET %08x\n", header.second_addr - header.kernel_addr + 0x00008000);
printf("BOARD_TAGS_OFFSET %08x\n",header.tags_addr - header.kernel_addr + 0x00008000);
printf("BOARD_PAGE_SIZE %d\n", header.page_size);
printf("BOARD_SECOND_SIZE %d\n", header.second_size);
printf("BOARD_DT_SIZE %d\n", header.dt_size);
if (pagesize == 0) {
pagesize = header.page_size;
}
//printf("cmdline...\n");
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-cmdline");
write_string_to_file(tmp, header.cmdline);
//printf("base...\n");
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-base");
char basetmp[200];
sprintf(basetmp, "%08x", header.kernel_addr - 0x00008000);
write_string_to_file(tmp, basetmp);
//printf("ramdisk_offset...\n");
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-ramdisk_offset");
char ramdisktmp[200];
sprintf(ramdisktmp, "%08x", header.ramdisk_addr - header.kernel_addr + 0x00008000);
write_string_to_file(tmp, ramdisktmp);
//printf("second_offset...\n");
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-second_offset");
char secondtmp[200];
sprintf(secondtmp, "%08x", header.second_addr - header.kernel_addr + 0x00008000);
write_string_to_file(tmp, secondtmp);
//printf("tags_offset...\n");
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-tags_offset");
char tagstmp[200];
sprintf(tagstmp, "%08x", header.tags_addr - header.kernel_addr + 0x00008000);
write_string_to_file(tmp, tagstmp);
//printf("pagesize...\n");
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-pagesize");
char pagesizetmp[200];
sprintf(pagesizetmp, "%d", header.page_size);
write_string_to_file(tmp, pagesizetmp);
total_read += sizeof(header);
//printf("total read: %d\n", total_read);
total_read += read_padding(f, sizeof(header), pagesize);
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-zImage");
FILE *k = fopen(tmp, "wb");
byte* kernel = (byte*)malloc(header.kernel_size);
//printf("Reading kernel...\n");
fread(kernel, header.kernel_size, 1, f);
total_read += header.kernel_size;
fwrite(kernel, header.kernel_size, 1, k);
fclose(k);
//printf("total read: %d\n", header.kernel_size);
total_read += read_padding(f, header.kernel_size, pagesize);
byte* ramdisk = (byte*)malloc(header.ramdisk_size);
//printf("Reading ramdisk...\n");
fread(ramdisk, header.ramdisk_size, 1, f);
total_read += header.ramdisk_size;
sprintf(tmp, "%s/%s", directory, basename(filename));
if(ramdisk[0] == 0x02 && ramdisk[1]== 0x21)
strcat(tmp, "-ramdisk.lz4");
else
strcat(tmp, "-ramdisk.gz");
FILE *r = fopen(tmp, "wb");
fwrite(ramdisk, header.ramdisk_size, 1, r);
fclose(r);
total_read += read_padding(f, header.ramdisk_size, pagesize);
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-second");
FILE *s = fopen(tmp, "wb");
byte* second = (byte*)malloc(header.second_size);
//printf("Reading second...\n");
fread(second, header.second_size, 1, f);
total_read += header.second_size;
fwrite(second, header.second_size, 1, r);
fclose(s);
total_read += read_padding(f, header.second_size, pagesize);
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-dt");
FILE *d = fopen(tmp, "wb");
byte* dt = (byte*)malloc(header.dt_size);
//printf("Reading dt...\n");
fread(dt, header.dt_size, 1, f);
total_read += header.dt_size;
fwrite(dt, header.dt_size, 1, r);
fclose(d);
total_read += read_padding(f, header.dt_size, pagesize);
sprintf(tmp, "%s/%s", directory, basename(filename));
strcat(tmp, "-signature");
FILE *fsig = fopen(tmp, "wb");
byte* bsig = (byte*)malloc(256);
//printf("Reading signature...\n");
fread(bsig, 256, 1, f);
total_read += 256;
fwrite(bsig, 256, 1, r);
fclose(fsig);
fclose(f);
//printf("Total Read: %d\n", total_read);
return 0;
}