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src/Source/LibJPEG/jdmarker.c  view on Meta::CPAN

 * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
 *
 * Note: This function may return a pseudo SOS marker (with zero
 * component number) for treat by input controller's consume_input.
 * consume_input itself should filter out (skip) the pseudo marker
 * after processing for the caller.
 */

METHODDEF(int)
read_markers (j_decompress_ptr cinfo)
{
  /* Outer loop repeats once for each marker. */
  for (;;) {
    /* Collect the marker proper, unless we already did. */
    /* NB: first_marker() enforces the requirement that SOI appear first. */
    if (cinfo->unread_marker == 0) {
      if (! cinfo->marker->saw_SOI) {
	if (! first_marker(cinfo))
	  return JPEG_SUSPENDED;
      } else {
	if (! next_marker(cinfo))
	  return JPEG_SUSPENDED;
      }
    }
    /* At this point cinfo->unread_marker contains the marker code and the
     * input point is just past the marker proper, but before any parameters.
     * A suspension will cause us to return with this state still true.
     */
    switch (cinfo->unread_marker) {
    case M_SOI:
      if (! get_soi(cinfo))
	return JPEG_SUSPENDED;
      break;

    case M_SOF0:		/* Baseline */
      if (! get_sof(cinfo, TRUE, FALSE, FALSE))
	return JPEG_SUSPENDED;
      break;

    case M_SOF1:		/* Extended sequential, Huffman */
      if (! get_sof(cinfo, FALSE, FALSE, FALSE))
	return JPEG_SUSPENDED;
      break;

    case M_SOF2:		/* Progressive, Huffman */
      if (! get_sof(cinfo, FALSE, TRUE, FALSE))
	return JPEG_SUSPENDED;
      break;

    case M_SOF9:		/* Extended sequential, arithmetic */
      if (! get_sof(cinfo, FALSE, FALSE, TRUE))
	return JPEG_SUSPENDED;
      break;

    case M_SOF10:		/* Progressive, arithmetic */
      if (! get_sof(cinfo, FALSE, TRUE, TRUE))
	return JPEG_SUSPENDED;
      break;

    /* Currently unsupported SOFn types */
    case M_SOF3:		/* Lossless, Huffman */
    case M_SOF5:		/* Differential sequential, Huffman */
    case M_SOF6:		/* Differential progressive, Huffman */
    case M_SOF7:		/* Differential lossless, Huffman */
    case M_JPG:			/* Reserved for JPEG extensions */
    case M_SOF11:		/* Lossless, arithmetic */
    case M_SOF13:		/* Differential sequential, arithmetic */
    case M_SOF14:		/* Differential progressive, arithmetic */
    case M_SOF15:		/* Differential lossless, arithmetic */
      ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo->unread_marker);
      break;

    case M_SOS:
      if (! get_sos(cinfo))
	return JPEG_SUSPENDED;
      cinfo->unread_marker = 0;	/* processed the marker */
      return JPEG_REACHED_SOS;

    case M_EOI:
      TRACEMS(cinfo, 1, JTRC_EOI);
      cinfo->unread_marker = 0;	/* processed the marker */
      return JPEG_REACHED_EOI;

    case M_DAC:
      if (! get_dac(cinfo))
	return JPEG_SUSPENDED;
      break;

    case M_DHT:
      if (! get_dht(cinfo))
	return JPEG_SUSPENDED;
      break;

    case M_DQT:
      if (! get_dqt(cinfo))
	return JPEG_SUSPENDED;
      break;

    case M_DRI:
      if (! get_dri(cinfo))
	return JPEG_SUSPENDED;
      break;

    case M_JPG8:
      if (! get_lse(cinfo))
	return JPEG_SUSPENDED;
      break;

    case M_APP0:
    case M_APP1:
    case M_APP2:
    case M_APP3:
    case M_APP4:
    case M_APP5:
    case M_APP6:
    case M_APP7:
    case M_APP8:
    case M_APP9:
    case M_APP10:
    case M_APP11:
    case M_APP12:
    case M_APP13:
    case M_APP14:
    case M_APP15:
      if (! (*((my_marker_ptr) cinfo->marker)->process_APPn[
		cinfo->unread_marker - (int) M_APP0]) (cinfo))
	return JPEG_SUSPENDED;
      break;