KH 0.2 PAK

#include <cstdio>
#include <cstdlib>
#include <cstdint>
#include <cassert>

struct Lba {
    uint64_t offset;
    uint64_t size;
    uint64_t uncompressedSize;
    uint32_t compressionMethod;
    uint32_t checksum[5]; // SHA-1
    uint8_t dummy[5];
};

uint64_t align(uint64_t offset, uint64_t alignment) {
    return offset - (offset - ((offset + alignment - 1) / alignment) * alignment);
}

int main() {
    char fileName[0x100];
    int bufferLen = 0x100000;
    void *buffer = malloc(bufferLen);

    FILE *f = fopen("tresgame-ps4.pak", "rb");
    assert(f != NULL);

    int index = 0;
    uint64_t pos = 0;
    Lba lba;
    while (fread(&lba, 0x35, 1, f) > 0) {
        printf("[%3i, %09X] ", index++, pos);
        if (lba.compressionMethod == 0 &&
            lba.dummy[0] == 0 &&
            lba.dummy[1] == 0 &&
            lba.dummy[2] == 0 &&
            lba.dummy[3] == 0 &&
            lba.dummy[4] == 0) {

            if (bufferLen < lba.size) {
                bufferLen = lba.size;
                free(buffer);
                buffer = malloc(bufferLen);
            }
            fread(buffer, lba.size, 1, f);

            const char *ext = "bin";
            // guess format
            if (*(uint8_t*)buffer == '{')
                ext = "json";
            else if (*(uint32_t*)buffer == 2653586369)
                ext = "upk";
            snprintf(fileName, sizeof(fileName), "out/%i.%s", index, ext);
            FILE *fOut = fopen(fileName, "wb");
            assert(fOut != NULL);
            fwrite(buffer, lba.size, 1, fOut);
            fclose(fOut);
        }

        uint64_t blockSize = align(lba.size, 0x10000);
        if (blockSize == 0)
            blockSize = 0x10000;
        pos += blockSize;
        _fseeki64(f, pos, SEEK_SET);
        printf("\n");
    }
    free(buffer);
}