jadeite/game_payload/src/hsr.c

#include <utils.h>
#include <err.h>

#include <game.h>

const char *HSR_NAME             = "StarRail";
const char *HSR_ASSEMBLY_PATH    = "GameAssembly.dll";
const char *HSR_TP6_SECTION_NAME = ".ace";
const char *HSR_TVM_SECTION_NAME = ".tvm0";

struct crc_id_pair {
    uint32_t crc;
    enum game_id id;
};

const struct crc_id_pair HSR_REGIONS[] = {
    // It may be possible to get rid of region-specific data altogether in the future

    { 0x2df53005, GAME_HSR_OS }, // os v1.1.0
    { 0x3e644d26, GAME_HSR_CN }  // cn v1.1.0
};

static void _unityplayer_callback(HMODULE unityModule) {
    // Disable shared resources

    // Temporarily hardcoded offset
    // v1.1.0, same for os and cn
    unsigned char *srAddr = ((unsigned char*)unityModule) + 0x16430;

    DWORD oldProtect;
    VirtualProtect(srAddr, 1, PAGE_EXECUTE_READWRITE, &oldProtect);

    *srAddr = 0xC3; // ret

    VirtualProtect(srAddr, 1, oldProtect, &oldProtect);
}

void hsr_fill_data(struct game_data *buf) {
    uint32_t crc = utils_file_crc32c("UnityPlayer.dll");
    
    enum game_id id = GAME_INVALID;
    for (size_t i = 0; i < sizeof(HSR_REGIONS) / sizeof(struct crc_id_pair); i++) {
        if (HSR_REGIONS[i].crc == crc) {
            id = HSR_REGIONS[i].id;
        }
    }
    
    if (id == GAME_INVALID) {
        err_mb_a("Invalid UnityPlayer.dll checksum: %d", crc);
    }

    buf->id = id;
    buf->name = HSR_NAME;
    buf->assembly_path = HSR_ASSEMBLY_PATH;
    buf->tp6_section_name = HSR_TP6_SECTION_NAME;
    buf->tvm_section_name = HSR_TVM_SECTION_NAME;

    buf->unityplayer_callback = &_unityplayer_callback;
}