*/    if (count > 256 || ((INT32) count) > length)      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);    for (i = 0; i < count; i++)      INPUT_BYTE(cinfo, huffval[i], return FALSE);    length -= count;    if (index & 0x10) {		/* AC table definition */      index -= 0x10;      htblptr = &cinfo->ac_huff_tbl_ptrs[index];    } else {			/* DC table definition */      htblptr = &cinfo->dc_huff_tbl_ptrs[index];    }    if (index < 0 || index >= NUM_HUFF_TBLS)      ERREXIT1(cinfo, JERR_DHT_INDEX, index);    if (*htblptr == NULL)      *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);      MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));    MEMCOPY((*htblptr)->huffval, huffval, SIZEOF((*htblptr)->huffval));  }  if (length != 0)    ERREXIT(cinfo, JERR_BAD_LENGTH);  INPUT_SYNC(cinfo);  return TRUE;}LOCAL(boolean)get_dqt (j_decompress_ptr cinfo)/* Process a DQT marker */{  INT32 length;  int n, i, prec;  unsigned int tmp;  JQUANT_TBL *quant_ptr;  INPUT_VARS(cinfo);  INPUT_2BYTES(cinfo, length, return FALSE);  length -= 2;  while (length > 0) {    INPUT_BYTE(cinfo, n, return FALSE);    prec = n >> 4;    n &= 0x0F;    TRACEMS2(cinfo, 1, JTRC_DQT, n, prec);    if (n >= NUM_QUANT_TBLS)      ERREXIT1(cinfo, JERR_DQT_INDEX, n);          if (cinfo->quant_tbl_ptrs[n] == NULL)      cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo);    quant_ptr = cinfo->quant_tbl_ptrs[n];    for (i = 0; i < DCTSIZE2; i++) {      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[jpeg_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 -= DCTSIZE2+1;    if (prec) length -= DCTSIZE2;  }  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;}/* * 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;    cinfo->JFIF_major_version = GETJOCTET(data[5]);    cinfo->JFIF_minor_version = GETJOCTET(data[6]);    cinfo->density_unit = GETJOCTET(data[7]);    cinfo->X_density = (GETJOCTET(data[8]) << 8) + GETJOCTET(data[9]);    cinfo->Y_density = (GETJOCTET(data[10]) << 8) + GETJOCTET(data[11]);    /* Check version.     * Major version must be 1, anything else signals an incompatible change.     * (We used to treat this as an error, but now it's a nonfatal warning,     * because some bozo at Hijaak couldn't read the spec.)     * Minor version should be 0..2, but process anyway if newer.     */    if (cinfo->JFIF_major_version != 1)      WARNMS2(cinfo, JWRN_JFIF_MAJOR,	      cinfo->JFIF_major_version, cinfo->JFIF_minor_version);    /* Generate trace messages */    TRACEMS5(cinfo, 1, JTRC_JFIF,	     cinfo->JFIF_major_version, cinfo->JFIF_minor_version,	     cinfo->X_density, cinfo->Y_density, cinfo->density_unit);    /* Validate thumbnail dimensions and issue appropriate messages */    if (GETJOCTET(data[12]) | GETJOCTET(data[13]))      TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL,	       GETJOCTET(data[12]), GETJOCTET(data[13]));    totallen -= APP0_DATA_LEN;    if (totallen !=	((INT32)GETJOCTET(data[12]) * (INT32)GETJOCTET(data[13]) * (INT32) 3))      TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int) totallen);  } else if (datalen >= 6 &&      GETJOCTET(data[0]) == 0x4A &&      GETJOCTET(data[1]) == 0x46 &&      GETJOCTET(data[2]) == 0x58 &&      GETJOCTET(data[3]) == 0x58 &&      GETJOCTET(data[4]) == 0) {    /* Found JFIF "JFXX" extension APP0 marker */    /* The library doesn't actually do anything with these,     * but we try to produce a helpful trace message.     */    switch (GETJOCTET(data[5])) {    case 0x10:      TRACEMS1(cinfo, 1, JTRC_THUMB_JPEG, (int) totallen);      break;    case 0x11:      TRACEMS1(cinfo, 1, JTRC_THUMB_PALETTE, (int) totallen);      break;    case 0x13:      TRACEMS1(cinfo, 1, JTRC_THUMB_RGB, (int) totallen);      break;    default:      TRACEMS2(cinfo, 1, JTRC_JFIF_EXTENSION,	       GETJOCTET(data[5]), (int) totallen);      break;    }  } else {    /* Start of APP0 does not match "JFIF" or "JFXX", or too short */    TRACEMS1(cinfo, 1, JTRC_APP0, (int) totallen);  }}LOCAL(void)examine_app14 (j_decompress_ptr cinfo, JOCTET FAR * data,	       unsigned int datalen, INT32 remaining)/* Examine first few bytes from an APP14. * Take appropriate action if it is an Adobe marker. * datalen is # of bytes at data[], remaining is length of rest of marker data. */{  unsigned int version, flags0, flags1, transform;  if (datalen >= APP14_DATA_LEN &&      GETJOCTET(data[0]) == 0x41 &&      GETJOCTET(data[1]) == 0x64 &&      GETJOCTET(data[2]) == 0x6F &&      GETJOCTET(data[3]) == 0x62 &&      GETJOCTET(data[4]) == 0x65) {    /* Found Adobe APP14 marker */    version = (GETJOCTET(data[5]) << 8) + GETJOCTET(data[6]);    flags0 = (GETJOCTET(data[7]) << 8) + GETJOCTET(data[8]);    flags1 = (GETJOCTET(data[9]) << 8) + GETJOCTET(data[10]);    transform = GETJOCTET(data[11]);    TRACEMS4(cinfo, 1, JTRC_ADOBE, version, flags0, flags1, transform);    cinfo->saw_Adobe_marker = TRUE;    cinfo->Adobe_transform = (UINT8) transform;  } else {    /* Start of APP14 does not match "Adobe", or too short */    TRACEMS1(cinfo, 1, JTRC_APP14, (int) (datalen + remaining));  }}METHODDEF(boolean)get_interesting_appn (j_decompress_ptr cinfo)/* Process an APP0 or APP14 marker without saving it */{  INT32 length;  JOCTET b[APPN_DATA_LEN];  unsigned int i, numtoread;  INPUT_VARS(cinfo);  INPUT_2BYTES(cinfo, length, return FALSE);  length -= 2;  /* get the interesting part of the marker data */  if (length >= APPN_DATA_LEN)    numtoread = APPN_DATA_LEN;  else if (length > 0)    numtoread = (unsigned int) length;  else    numtoread = 0;  for (i = 0; i < numtoread; i++)    INPUT_BYTE(cinfo, b[i], return FALSE);  length -= numtoread;  /* process it */  switch (cinfo->unread_marker) {  case M_APP0:    examine_app0(cinfo, (JOCTET FAR *) b, numtoread, length);    break;  case M_APP14:    examine_app14(cinfo, (JOCTET FAR *) b, numtoread, length);    break;  default:    /* can't get here unless jpeg_save_markers chooses wrong processor */    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);    break;  }  /* skip any remaining data -- could be lots */  INPUT_SYNC(cinfo);  if (length > 0)    (*cinfo->src->skip_input_data) (cinfo, (long) length);  return TRUE;}#ifdef SAVE_MARKERS_SUPPORTEDMETHODDEF(boolean)save_marker (j_decompress_ptr cinfo)/* Save an APPn or COM marker into the marker list */{  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;  jpeg_saved_marker_ptr cur_marker = marker->cur_marker;  unsigned int bytes_read, data_length;  JOCTET FAR * data;  INT32 length = 0;  INPUT_VARS(cinfo);  if (cur_marker == NULL) {    /* begin reading a marker */    INPUT_2BYTES(cinfo, length, return FALSE);    length -= 2;    if (length >= 0) {		/* watch out for bogus length word */      /* figure out how much we want to save */      unsigned int limit;      if (cinfo->unread_marker == (int) M_COM)	limit = marker->length_limit_COM;      else	limit = marker->length_limit_APPn[cinfo->unread_marker - (int) M_APP0];      if ((unsigned int) length < limit)	limit = (unsigned int) length;      /* allocate and initialize the marker item */      cur_marker = (jpeg_saved_marker_ptr)	(*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,				    SIZEOF(struct jpeg_marker_struct) + limit);      cur_marker->next = NULL;      cur_marker->marker = (UINT8) cinfo->unread_marker;      cur_marker->original_length = (unsigned int) length;      cur_marker->data_length = limit;      /* data area is just beyond the jpeg_marker_struct */      data = cur_marker->data = (JOCTET FAR *) (cur_marker + 1);      marker->cur_marker = cur_marker;      marker->bytes_read = 0;      bytes_read = 0;      data_length = limit;    } else {      /* deal with bogus length word */      bytes_read = data_length = 0;      data = NULL;    }  } else {    /* resume reading a marker */    bytes_read = marker->bytes_read;    data_length = cur_marker->data_length;    data = cur_marker->data + bytes_read;  }  while (bytes_read < data_length) {    INPUT_SYNC(cinfo);		/* move the restart point to here */    marker->bytes_read = bytes_read;    /* If there's not at least one byte in buffer, suspend */    MAKE_BYTE_AVAIL(cinfo, return FALSE);    /* Copy bytes with reasonable rapidity */    while (bytes_read < data_length && bytes_in_buffer > 0) {      *data++ = *next_input_byte++;      bytes_in_buffer--;      bytes_read++;    }  }  /* Done reading what we want to read */  if (cur_marker != NULL) {	/* will be NULL if bogus length word */    /* Add new marker to end of list */    if (cinfo->marker_list == NULL) {      cinfo->marker_list = cur_marker;    } else {      jpeg_saved_marker_ptr prev = cinfo->marker_list;      while (prev->next != NULL)	prev = prev->next;      prev->next = cur_marker;    }    /* Reset pointer & calc remaining data length */    data = cur_marker->data;    length = cur_marker->original_length - data_length;  }  /* Reset to initial state for next marker */  marker->cur_marker = NULL;  /* Process the marker if interesting; else just make a generic trace msg */  switch (cinfo->unread_marker) {  case M_APP0:    examine_app0(cinfo, data, data_length, length);    break;  case M_APP14:    examine_app14(cinfo, data, data_length, length);    break;  default:    TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker,	     (int) (data_length + length));    break;  }  /* skip any remaining data -- could be lots */  INPUT_SYNC(cinfo);		/* do before skip_input_data */  if (length > 0)    (*cinfo->src->skip_input_data) (cinfo, (long) length);  return TRUE;}#endif /* SAVE_MARKERS_SUPPORTED */METHODDEF(boolean)skip_variable (j_decompress_ptr cinfo)/* Skip over an unknown or uninteresting variable-length marker */{  INT32 length;  INPUT_VARS(cinfo);  INPUT_2BYTES(cinfo, length, return FALSE);  length -= 2;    TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, (int) length);  INPUT_SYNC(cinfo);		/* do before skip_input_data */  if (length > 0)    (*cinfo->src->skip_input_data) (cinfo, (long) length);  return TRUE;}/* * Find the next JPEG marker, save it in cinfo->unread_marker. * Returns FALSE if had to suspend before reaching a marker; * in that case cinfo->unread_marker is unchanged. * * Note that the result might not be a valid marker code, * but it will never be 0 or FF. */LOCAL(boolean)next_marker (j_decompress_ptr cinfo){  int c;  INPUT_VARS(cinfo);  for (;;) {    INPUT_BYTE(cinfo, c, return FALSE);    /* Skip any non-FF bytes.     * This may look a bit inefficient, but it will not occur in a valid file.     * We sync after each discarded byte so that a suspending data source     * can discard the byte from its buffer.     */    while (c != 0xFF) {      cinfo->marker->discarded_bytes++;      INPUT_SYNC(cinfo);      INPUT_BYTE(cinfo, c, return FALSE);    }    /* This loop swallows any duplicate FF bytes.  Extra FFs are legal as     * pad bytes, so don't count them in discarded_bytes.  We assume there     * will not be so many consecutive FF bytes as to overflow a suspending     * data source's input buffer.     */    do {      INPUT_BYTE(cinfo, c, return FALSE);    } while (c == 0xFF);    if (c != 0)      break;			/* found a valid marker, exit loop */    /* Reach here if we found a stuffed-zero data sequence (FF/00).     * Discard it and loop back to try again.     */    cinfo->marker->discarded_bytes += 2;    INPUT_SYNC(cinfo);  }  if (cinfo->marker->discarded_bytes != 0) {