Function read_buf

Picviewer CE+/Picviewer CE+.user.js:6330–6352

(strm, buf, start, size)

 * (See also flush_pending()).
 */
function read_buf(strm, buf, start, size) {
  var len = strm.avail_in;

  if (len > size) { len = size; }
  if (len === 0) { return 0; }

  strm.avail_in -= len;

  // zmemcpy(buf, strm->next_in, len);
  utils.arraySet(buf, strm.input, strm.next_in, len, start);
  if (strm.state.wrap === 1) {
    strm.adler = adler32(strm.adler, buf, len, start);
  }

  else if (strm.state.wrap === 2) {
    strm.adler = crc32(strm.adler, buf, len, start);
  }

  strm.next_in += len;
  strm.total_in += len;

  return len;
}


/* ===========================================================================