sony psp param.sfo dumper

param_sfo_dumper.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdint.h>

#define CONV_LE(addr, dest) { \
	dest = addr[0] | addr[1] << 8 | addr[2] << 16 | addr[3] << 24; \
}

#define CONV_LE16(addr, dest) { \
	dest = addr[0] | addr[1] << 8; \
}

int main(int argc, char **argv){
	if(argc != 2){
		printf("this program takes exactly one argument, path to param.sfo\n");
		exit(1);
	}

	int fd = open(argv[1], O_RDONLY);
	if(fd <= 0){
		printf("cannot open %s for reading\n", argv[1]);
	}

	lseek(fd, 0x08, SEEK_SET);
	unsigned char buf[4];
	if(read(fd, &buf, 4) != 4){
		close(fd);
		printf("failed reading key table start from sfo\n");
		return -1;
	}
	uint32_t key_table_start = 0;
	CONV_LE(buf, key_table_start);
	printf("key_table_start is %ld\n", key_table_start);

	if(read(fd, &buf, 4) != 4){
		close(fd);
		printf("failed reading data table start from sfo\n");
		return -1;
	}
	uint32_t data_table_start = 0;
	CONV_LE(buf, data_table_start);
	printf("data_table_start is %ld\n", data_table_start);

	if(read(fd, &buf, 4) != 4){
		close(fd);
		printf("failed reading tables entries from sfo\n");
		return -1;
	}
	uint32_t tables_entries = 0;
	CONV_LE(buf, tables_entries);
	printf("tables_entries is %ld\n", tables_entries);

	int i;
	for(i = 0;i < tables_entries;i++){
		lseek(fd, 0x14 + i * 0x10, SEEK_SET);
		if(read(fd, &buf, 2) != 2){
			close(fd);
			printf("failed reading key offset from sfo\n");
			return -1;
		}
		uint32_t key_offset = 0;
		CONV_LE16(buf, key_offset);

		if(read(fd, &buf, 2) != 2){
			close(fd);
			printf("failed reading data format from sfo\n");
			return -1;
		}
		uint32_t data_format = 0;
		CONV_LE16(buf, data_format);

		if(read(fd, &buf, 4) != 4){
			close(fd);
			printf("failed reading data len from sfo\n");
			return -1;
		}
		uint32_t data_len = 0;
		CONV_LE(buf, data_len);

		lseek(fd, 4, SEEK_CUR);
		if(read(fd, &buf, 4) != 4){
			close(fd);
			printf("failed reading data offset from sfo\n");
			return -1;
		}
		uint32_t data_offset = 0;
		CONV_LE(buf, data_offset);

		lseek(fd, key_offset + key_table_start, SEEK_SET);
		char keybuf[50];
		int j;
		for(j = 0;j < 50;j++){
			if(read(fd, &keybuf[j], 1) != 1){
				close(fd);
				printf("failed reading key from sfo\n");
			}
			if(keybuf[j] == 0){
				break;
			}
		}
		printf("key is %s\n", keybuf);

		lseek(fd, data_offset + data_table_start, SEEK_SET);
		char databuf[data_len];
		for(j = 0;j < data_len; j++){
			if(read(fd, &databuf[j], 1) != 1){
				close(fd);
				printf("failed reading data from sfo\n");
			}
		}
		if(data_format == 0x0204){
			printf("utf8 data: %s\n", databuf);
		}else{
			printf("hex data: ");
			int j;
			for(j = 0;j < data_len; j++){
				if(j != 0 && j % 16 == 0){
					printf("| ");
				}
				printf("0x%02x ", (uint8_t)databuf[j]);
			}
			printf("\n");
		}
	}
	close(fd);
}