xmlGzfileRead (void * context, char * buffer, int len) {
    int ret;

    ret = gzread((gzFile) context, &buffer[0], len);
    if (ret < 0) xmlIOErr(0, "gzread()");
    return(ret);
}
xmlGzfileRead (void * context, char * buffer, int len) {
    int ret;

    ret = gzread((gzFile) context, &buffer[0], len);
    if (ret < 0) xmlIOErr(0, "gzread()");
    return(ret);
}