Function common_download_model

subprojects/llama.cpp/common/download.cpp:524–598

}

bool common_download_model(const common_params_model & model,
                           const std::string & bearer_token,
                           bool offline,
                           const common_header_list & headers) {
    // Basic validation of the model.url
    if (model.url.empty()) {
        LOG_ERR("%s: invalid model url\n", __func__);
        return false;
    }

    const int http_status = common_download_file_single(model.url, model.path, bearer_token, offline, headers);
    if (!is_http_status_ok(http_status)) {
        return false;
    }

    // check for additional GGUFs split to download
    int n_split = 0;
    {
        struct gguf_init_params gguf_params = {
            /*.no_alloc = */ true,
            /*.ctx      = */ NULL,
        };
        auto * ctx_gguf = gguf_init_from_file(model.path.c_str(), gguf_params);
        if (!ctx_gguf) {
            LOG_ERR("\n%s:  failed to load input GGUF from %s\n", __func__, model.path.c_str());
            return false;
        }

        auto key_n_split = gguf_find_key(ctx_gguf, LLM_KV_SPLIT_COUNT);
        if (key_n_split >= 0) {
            n_split = gguf_get_val_u16(ctx_gguf, key_n_split);
        }

        gguf_free(ctx_gguf);
    }

    if (n_split > 1) {
        char split_prefix[PATH_MAX] = {0};
        char split_url_prefix[LLAMA_MAX_URL_LENGTH] = {0};

        // Verify the first split file format
        // and extract split URL and PATH prefixes
        {
            if (!llama_split_prefix(split_prefix, sizeof(split_prefix), model.path.c_str(), 0, n_split)) {
                LOG_ERR("\n%s: unexpected model file name: %s n_split=%d\n", __func__, model.path.c_str(), n_split);
                return false;
            }

            if (!llama_split_prefix(split_url_prefix, sizeof(split_url_prefix), model.url.c_str(), 0, n_split)) {
                LOG_ERR("\n%s: unexpected model url: %s n_split=%d\n", __func__, model.url.c_str(), n_split);
                return false;
            }
        }

        std::vector<std::pair<std::string, std::string>> urls;
        for (int idx = 1; idx < n_split; idx++) {
            char split_path[PATH_MAX] = {0};
            llama_split_path(split_path, sizeof(split_path), split_prefix, idx, n_split);