Method cookieDumpDex

Bcore/src/main/cpp/DexDump.cpp:211–271

}

void DexDump::cookieDumpDex(JNIEnv *env, jlong cookie, jstring dir, jboolean fix) {
    if (beginOffset == -2) {
        init(env);
    }
    if (beginOffset == -1) {
        ALOGD("dumpDex not support!");
        return;
    }
    char magic[8] = {0x64, 0x65, 0x78, 0x0a, 0x30, 0x33, 0x35, 0x00};
    auto base = reinterpret_cast<char *>(cookie);
    auto begin = *(size_t *) (base + beginOffset * sizeof(size_t));
    if (!PointerCheck::check(reinterpret_cast<void *>(begin))) {
        return;
    }
    auto dirC = env->GetStringUTFChars(dir, 0);

    auto dexSizeOffset = ((unsigned long) begin) + 0x20;
    int size = *(size_t *) dexSizeOffset;

    void *buffer = malloc(size);
    if (buffer) {
        memcpy(buffer, reinterpret_cast<const void *>(begin), size);
        // fix magic
        memcpy(buffer, magic, sizeof(magic));

        const bool kVerifyChecksum = false;
        const bool kVerify = true;
        const art_lkchan::DexFileLoader dex_file_loader;
        std::string error_msg;
        std::vector<std::unique_ptr<const art_lkchan::DexFile>> dex_files;
        if (!dex_file_loader.OpenAll(reinterpret_cast<const uint8_t *>(buffer),
                                     size,
                                     "",
                                     kVerify,
                                     kVerifyChecksum,
                                     &error_msg,
                                     &dex_files)) {
            // Display returned error message to user. Note that this error behavior
            // differs from the error messages shown by the original Dalvik dexdump.
            ALOGE("Open dex error %s", error_msg.c_str());
            return;
        }

        if (fix) {
            fixCodeItem(env, dex_files[0].get(), begin);
        }
        char path[1024];
        sprintf(path, "%s/cookie_%d.dex", dirC, size);
        auto fd = open(path, O_CREAT | O_WRONLY, 0600);
        ssize_t w = write(fd, buffer, size);
        fsync(fd);
        if (w > 0) {
            ALOGE("cookie dump dex ======> %s", path);
        } else {
            remove(path);
        }
        close(fd);
        free(buffer);