Function gzread

freebsd/contrib/zlib/test/minigzip.c:260–293

(gz, buf, len)

int gzread OF((gzFile, void *, unsigned));

int gzread(gz, buf, len)
    gzFile gz;
    void *buf;
    unsigned len;
{
    int ret;
    unsigned got;
    unsigned char in[1];
    z_stream *strm;

    if (gz == NULL || gz->write)
        return 0;
    if (gz->err)
        return 0;
    strm = &(gz->strm);
    strm->next_out = (void *)buf;
    strm->avail_out = len;
    do {
        got = fread(in, 1, 1, gz->file);
        if (got == 0)
            break;
        strm->next_in = in;
        strm->avail_in = 1;
        ret = inflate(strm, Z_NO_FLUSH);
        if (ret == Z_DATA_ERROR) {
            gz->err = Z_DATA_ERROR;
            gz->msg = strm->msg;
            return 0;
        }
        if (ret == Z_STREAM_END)
            inflateReset(strm);
    } while (strm->avail_out);
    return len - strm->avail_out;
}

int gzclose OF((gzFile));