Function parse_metadata

ds4.c:1859–1885

Read the GGUF metadata table. Values stay in the mmap; we store offsets so * later validation can decode only the keys it needs. */

static bool write_f32_binary_file(const char *path, const float *data, uint64_t n) {
    FILE *fp = fopen(path, "wb");
    if (!fp) {
        fprintf(stderr, "ds4: failed to open %s for writing: %s\n", path, strerror(errno));
        return false;
    }
    const size_t nw = fwrite(data, sizeof(float), (size_t)n, fp);
    const bool ok = nw == (size_t)n && fclose(fp) == 0;
    if (!ok) {
        fprintf(stderr, "ds4: failed to write %s\n", path);
        return false;
    }
    return true;
}

static bool read_f32_binary_file(const char *path, float *data, uint64_t n) {
    struct stat st;
    if (stat(path, &st) != 0) {
        fprintf(stderr, "ds4: failed to stat %s: %s\n", path, strerror(errno));
        return false;
    }
    if (st.st_size < 0 || (uint64_t)st.st_size != n * sizeof(float)) {
        fprintf(stderr,
                "ds4: %s has size %llu bytes, expected %llu bytes\n",
                path,
                (unsigned long long)st.st_size,
                (unsigned long long)(n * sizeof(float)));
        return false;
    }

    FILE *fp = fopen(path, "rb");
    if (!fp) {