Function gguf_init_from_file_ptr

external/ggml/src/gguf.cpp:397–845

}

struct gguf_context * gguf_init_from_file_ptr(FILE * file, struct gguf_init_params params) {
    if (!file) {
        return nullptr;
    }

    const struct gguf_reader gr(file);
    struct gguf_context * ctx = new gguf_context;

    bool ok = true;

    // file magic
    {
        std::vector<char> magic;
        ok = ok && gr.read(magic, 4);

        if (!ok) {
            GGML_LOG_ERROR("%s: failed to read magic\n", __func__);
            gguf_free(ctx);
            return nullptr;
        }

        for (uint32_t i = 0; i < magic.size(); i++) {
            if (magic[i] != GGUF_MAGIC[i]) {
                char c0 = isprint(magic[0]) ? magic[0] : '?';
                char c1 = isprint(magic[1]) ? magic[1] : '?';
                char c2 = isprint(magic[2]) ? magic[2] : '?';
                char c3 = isprint(magic[3]) ? magic[3] : '?';
                GGML_LOG_ERROR("%s: invalid magic characters: '%c%c%c%c', expected 'GGUF'\n", __func__, c0, c1, c2, c3);
                gguf_free(ctx);
                return nullptr;
            }
        }
    }

    // header
    int64_t n_kv      = 0;
    int64_t n_tensors = 0;

    if (ok && gr.read(ctx->version)) {
        if (ok && ctx->version == 0) {
            GGML_LOG_ERROR("%s: bad GGUF version: %" PRIu32 "\n", __func__, ctx->version);
            ok = false;
        }

        /*
         * bit layout is different when reading non-native endian models.
         * assuming that the GGUF version is 3, the non-native endian model
         * would read it as 0x30000000. we can use the AND operation against
         * the last 4 hexadecimal digits to check if the model is the same
         * endianness as the host system.
        */
        if (ok && (ctx->version & 0x0000FFFF) == 0x00000000) {
            GGML_LOG_ERROR("%s: failed to load model: this GGUF file version %" PRIu32 " is extremely large, is there a mismatch between the host and model endianness?\n", __func__, ctx->version);
            ok = false;
        }

        if (ok && ctx->version == 1) {
            GGML_LOG_ERROR("%s: GGUFv1 is no longer supported, please use a more up-to-date version\n", __func__);