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

      if (prec)
	INPUT_2BYTES(cinfo, tmp, return FALSE);
      else
	INPUT_BYTE(cinfo, tmp, return FALSE);
      /* We convert the zigzag-order table to natural array order. */
      quant_ptr->quantval[natural_order[i]] = (UINT16) tmp;
    }

    if (cinfo->err->trace_level >= 2) {
      for (i = 0; i < DCTSIZE2; i += 8) {
	TRACEMS8(cinfo, 2, JTRC_QUANTVALS,
		 quant_ptr->quantval[i],   quant_ptr->quantval[i+1],
		 quant_ptr->quantval[i+2], quant_ptr->quantval[i+3],
		 quant_ptr->quantval[i+4], quant_ptr->quantval[i+5],
		 quant_ptr->quantval[i+6], quant_ptr->quantval[i+7]);
      }
    }

    length -= count;
    if (prec) length -= count;
  }

  if (length != 0)
    ERREXIT(cinfo, JERR_BAD_LENGTH);

  INPUT_SYNC(cinfo);
  return TRUE;
}


LOCAL(boolean)
get_dri (j_decompress_ptr cinfo)
/* Process a DRI marker */
{
  INT32 length;
  unsigned int tmp;
  INPUT_VARS(cinfo);

  INPUT_2BYTES(cinfo, length, return FALSE);
  
  if (length != 4)
    ERREXIT(cinfo, JERR_BAD_LENGTH);

  INPUT_2BYTES(cinfo, tmp, return FALSE);

  TRACEMS1(cinfo, 1, JTRC_DRI, tmp);

  cinfo->restart_interval = tmp;

  INPUT_SYNC(cinfo);
  return TRUE;
}


LOCAL(boolean)
get_lse (j_decompress_ptr cinfo)
/* Process an LSE marker */
{
  INT32 length;
  unsigned int tmp;
  int cid;
  INPUT_VARS(cinfo);

  if (! cinfo->marker->saw_SOF)
    ERREXITS(cinfo, JERR_SOF_BEFORE, "LSE");

  if (cinfo->num_components < 3) goto bad;

  INPUT_2BYTES(cinfo, length, return FALSE);

  if (length != 24)
    ERREXIT(cinfo, JERR_BAD_LENGTH);

  INPUT_BYTE(cinfo, tmp, return FALSE);
  if (tmp != 0x0D)	/* ID inverse transform specification */
    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);
  INPUT_2BYTES(cinfo, tmp, return FALSE);
  if (tmp != MAXJSAMPLE) goto bad;		/* MAXTRANS */
  INPUT_BYTE(cinfo, tmp, return FALSE);
  if (tmp != 3) goto bad;			/* Nt=3 */
  INPUT_BYTE(cinfo, cid, return FALSE);
  if (cid != cinfo->comp_info[1].component_id) goto bad;
  INPUT_BYTE(cinfo, cid, return FALSE);
  if (cid != cinfo->comp_info[0].component_id) goto bad;
  INPUT_BYTE(cinfo, cid, return FALSE);
  if (cid != cinfo->comp_info[2].component_id) goto bad;
  INPUT_BYTE(cinfo, tmp, return FALSE);
  if (tmp != 0x80) goto bad;		/* F1: CENTER1=1, NORM1=0 */
  INPUT_2BYTES(cinfo, tmp, return FALSE);
  if (tmp != 0) goto bad;			/* A(1,1)=0 */
  INPUT_2BYTES(cinfo, tmp, return FALSE);
  if (tmp != 0) goto bad;			/* A(1,2)=0 */
  INPUT_BYTE(cinfo, tmp, return FALSE);
  if (tmp != 0) goto bad;		/* F2: CENTER2=0, NORM2=0 */
  INPUT_2BYTES(cinfo, tmp, return FALSE);
  if (tmp != 1) goto bad;			/* A(2,1)=1 */
  INPUT_2BYTES(cinfo, tmp, return FALSE);
  if (tmp != 0) goto bad;			/* A(2,2)=0 */
  INPUT_BYTE(cinfo, tmp, return FALSE);
  if (tmp != 0) goto bad;		/* F3: CENTER3=0, NORM3=0 */
  INPUT_2BYTES(cinfo, tmp, return FALSE);
  if (tmp != 1) goto bad;			/* A(3,1)=1 */
  INPUT_2BYTES(cinfo, tmp, return FALSE);
  if (tmp != 0) {				/* A(3,2)=0 */
    bad:
    ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
  }

  /* OK, valid transform that we can handle. */
  cinfo->color_transform = JCT_SUBTRACT_GREEN;

  INPUT_SYNC(cinfo);
  return TRUE;
}


/*
 * Routines for processing APPn and COM markers.
 * These are either saved in memory or discarded, per application request.
 * APP0 and APP14 are specially checked to see if they are
 * JFIF and Adobe markers, respectively.
 */

#define APP0_DATA_LEN	14	/* Length of interesting data in APP0 */
#define APP14_DATA_LEN	12	/* Length of interesting data in APP14 */
#define APPN_DATA_LEN	14	/* Must be the largest of the above!! */


LOCAL(void)
examine_app0 (j_decompress_ptr cinfo, JOCTET FAR * data,
	      unsigned int datalen, INT32 remaining)
/* Examine first few bytes from an APP0.
 * Take appropriate action if it is a JFIF marker.
 * datalen is # of bytes at data[], remaining is length of rest of marker data.
 */
{
  INT32 totallen = (INT32) datalen + remaining;

  if (datalen >= APP0_DATA_LEN &&
      GETJOCTET(data[0]) == 0x4A &&
      GETJOCTET(data[1]) == 0x46 &&
      GETJOCTET(data[2]) == 0x49 &&
      GETJOCTET(data[3]) == 0x46 &&
      GETJOCTET(data[4]) == 0) {
    /* Found JFIF APP0 marker: save info */
    cinfo->saw_JFIF_marker = TRUE;