Remove damned ancient DOS line endings from Irrlicht. Hopefully I did not go overboard.

1 files changed, 1406 insertions, 1406 deletions

diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdmarker.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdmarker.c
index e062822..5ff636c 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdmarker.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/jdmarker.c
@@ -1,1406 +1,1406 @@
-/*

- * jdmarker.c

- *

- * Copyright (C) 1991-1998, Thomas G. Lane.

- * Modified 2009 by Guido Vollbeding.

- * This file is part of the Independent JPEG Group's software.

- * For conditions of distribution and use, see the accompanying README file.

- *

- * This file contains routines to decode JPEG datastream markers.

- * Most of the complexity arises from our desire to support input

- * suspension: if not all of the data for a marker is available,

- * we must exit back to the application.  On resumption, we reprocess

- * the marker.

- */

-

-#define JPEG_INTERNALS

-#include "jinclude.h"

-#include "jpeglib.h"

-

-

-typedef enum {                  /* JPEG marker codes */

-  M_SOF0  = 0xc0,

-  M_SOF1  = 0xc1,

-  M_SOF2  = 0xc2,

-  M_SOF3  = 0xc3,

-  

-  M_SOF5  = 0xc5,

-  M_SOF6  = 0xc6,

-  M_SOF7  = 0xc7,

-  

-  M_JPG   = 0xc8,

-  M_SOF9  = 0xc9,

-  M_SOF10 = 0xca,

-  M_SOF11 = 0xcb,

-  

-  M_SOF13 = 0xcd,

-  M_SOF14 = 0xce,

-  M_SOF15 = 0xcf,

-  

-  M_DHT   = 0xc4,

-  

-  M_DAC   = 0xcc,

-  

-  M_RST0  = 0xd0,

-  M_RST1  = 0xd1,

-  M_RST2  = 0xd2,

-  M_RST3  = 0xd3,

-  M_RST4  = 0xd4,

-  M_RST5  = 0xd5,

-  M_RST6  = 0xd6,

-  M_RST7  = 0xd7,

-  

-  M_SOI   = 0xd8,

-  M_EOI   = 0xd9,

-  M_SOS   = 0xda,

-  M_DQT   = 0xdb,

-  M_DNL   = 0xdc,

-  M_DRI   = 0xdd,

-  M_DHP   = 0xde,

-  M_EXP   = 0xdf,

-  

-  M_APP0  = 0xe0,

-  M_APP1  = 0xe1,

-  M_APP2  = 0xe2,

-  M_APP3  = 0xe3,

-  M_APP4  = 0xe4,

-  M_APP5  = 0xe5,

-  M_APP6  = 0xe6,

-  M_APP7  = 0xe7,

-  M_APP8  = 0xe8,

-  M_APP9  = 0xe9,

-  M_APP10 = 0xea,

-  M_APP11 = 0xeb,

-  M_APP12 = 0xec,

-  M_APP13 = 0xed,

-  M_APP14 = 0xee,

-  M_APP15 = 0xef,

-  

-  M_JPG0  = 0xf0,

-  M_JPG13 = 0xfd,

-  M_COM   = 0xfe,

-  

-  M_TEM   = 0x01,

-  

-  M_ERROR = 0x100

-} JPEG_MARKER;

-

-

-/* Private state */

-

-typedef struct {

-  struct jpeg_marker_reader pub; /* public fields */

-

-  /* Application-overridable marker processing methods */

-  jpeg_marker_parser_method process_COM;

-  jpeg_marker_parser_method process_APPn[16];

-

-  /* Limit on marker data length to save for each marker type */

-  unsigned int length_limit_COM;

-  unsigned int length_limit_APPn[16];

-

-  /* Status of COM/APPn marker saving */

-  jpeg_saved_marker_ptr cur_marker;     /* NULL if not processing a marker */

-  unsigned int bytes_read;              /* data bytes read so far in marker */

-  /* Note: cur_marker is not linked into marker_list until it's all read. */

-} my_marker_reader;

-

-typedef my_marker_reader * my_marker_ptr;

-

-

-/*

- * Macros for fetching data from the data source module.

- *

- * At all times, cinfo->src->next_input_byte and ->bytes_in_buffer reflect

- * the current restart point; we update them only when we have reached a

- * suitable place to restart if a suspension occurs.

- */

-

-/* Declare and initialize local copies of input pointer/count */

-#define INPUT_VARS(cinfo)  \

-        struct jpeg_source_mgr * datasrc = (cinfo)->src;  \

-        const JOCTET * next_input_byte = datasrc->next_input_byte;  \

-        size_t bytes_in_buffer = datasrc->bytes_in_buffer

-

-/* Unload the local copies --- do this only at a restart boundary */

-#define INPUT_SYNC(cinfo)  \

-        ( datasrc->next_input_byte = next_input_byte,  \

-          datasrc->bytes_in_buffer = bytes_in_buffer )

-

-/* Reload the local copies --- used only in MAKE_BYTE_AVAIL */

-#define INPUT_RELOAD(cinfo)  \

-        ( next_input_byte = datasrc->next_input_byte,  \

-          bytes_in_buffer = datasrc->bytes_in_buffer )

-

-/* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available.

- * Note we do *not* do INPUT_SYNC before calling fill_input_buffer,

- * but we must reload the local copies after a successful fill.

- */

-#define MAKE_BYTE_AVAIL(cinfo,action)  \

-        if (bytes_in_buffer == 0) {  \

-          if (! (*datasrc->fill_input_buffer) (cinfo))  \

-            { action; }  \

-          INPUT_RELOAD(cinfo);  \

-        }

-

-/* Read a byte into variable V.

- * If must suspend, take the specified action (typically "return FALSE").

- */

-#define INPUT_BYTE(cinfo,V,action)  \

-        MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \

-                  bytes_in_buffer--; \

-                  V = GETJOCTET(*next_input_byte++); )

-

-/* As above, but read two bytes interpreted as an unsigned 16-bit integer.

- * V should be declared unsigned int or perhaps INT32.

- */

-#define INPUT_2BYTES(cinfo,V,action)  \

-        MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \

-                  bytes_in_buffer--; \

-                  V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \

-                  MAKE_BYTE_AVAIL(cinfo,action); \

-                  bytes_in_buffer--; \

-                  V += GETJOCTET(*next_input_byte++); )

-

-

-/*

- * Routines to process JPEG markers.

- *

- * Entry condition: JPEG marker itself has been read and its code saved

- *   in cinfo->unread_marker; input restart point is just after the marker.

- *

- * Exit: if return TRUE, have read and processed any parameters, and have

- *   updated the restart point to point after the parameters.

- *   If return FALSE, was forced to suspend before reaching end of

- *   marker parameters; restart point has not been moved.  Same routine

- *   will be called again after application supplies more input data.

- *

- * This approach to suspension assumes that all of a marker's parameters

- * can fit into a single input bufferload.  This should hold for "normal"

- * markers.  Some COM/APPn markers might have large parameter segments

- * that might not fit.  If we are simply dropping such a marker, we use

- * skip_input_data to get past it, and thereby put the problem on the

- * source manager's shoulders.  If we are saving the marker's contents

- * into memory, we use a slightly different convention: when forced to

- * suspend, the marker processor updates the restart point to the end of

- * what its consumed (ie, the end of the buffer) before returning FALSE.

- * On resumption, cinfo->unread_marker still contains the marker code,

- * but the data source will point to the next chunk of marker data.

- * The marker processor must retain internal state to deal with this.

- *

- * Note that we don't bother to avoid duplicate trace messages if a

- * suspension occurs within marker parameters.  Other side effects

- * require more care.

- */

-

-

-LOCAL(boolean)

-get_soi (j_decompress_ptr cinfo)

-/* Process an SOI marker */

-{

-  int i;

-  

-  TRACEMS(cinfo, 1, JTRC_SOI);

-

-  if (cinfo->marker->saw_SOI)

-    ERREXIT(cinfo, JERR_SOI_DUPLICATE);

-

-  /* Reset all parameters that are defined to be reset by SOI */

-

-  for (i = 0; i < NUM_ARITH_TBLS; i++) {

-    cinfo->arith_dc_L[i] = 0;

-    cinfo->arith_dc_U[i] = 1;

-    cinfo->arith_ac_K[i] = 5;

-  }

-  cinfo->restart_interval = 0;

-

-  /* Set initial assumptions for colorspace etc */

-

-  cinfo->jpeg_color_space = JCS_UNKNOWN;

-  cinfo->CCIR601_sampling = FALSE; /* Assume non-CCIR sampling??? */

-

-  cinfo->saw_JFIF_marker = FALSE;

-  cinfo->JFIF_major_version = 1; /* set default JFIF APP0 values */

-  cinfo->JFIF_minor_version = 1;

-  cinfo->density_unit = 0;

-  cinfo->X_density = 1;

-  cinfo->Y_density = 1;

-  cinfo->saw_Adobe_marker = FALSE;

-  cinfo->Adobe_transform = 0;

-

-  cinfo->marker->saw_SOI = TRUE;

-

-  return TRUE;

-}

-

-

-LOCAL(boolean)

-get_sof (j_decompress_ptr cinfo, boolean is_baseline, boolean is_prog,

-         boolean is_arith)

-/* Process a SOFn marker */

-{

-  INT32 length;

-  int c, ci;

-  jpeg_component_info * compptr;

-  INPUT_VARS(cinfo);

-

-  cinfo->is_baseline = is_baseline;

-  cinfo->progressive_mode = is_prog;

-  cinfo->arith_code = is_arith;

-

-  INPUT_2BYTES(cinfo, length, return FALSE);

-

-  INPUT_BYTE(cinfo, cinfo->data_precision, return FALSE);

-  INPUT_2BYTES(cinfo, cinfo->image_height, return FALSE);

-  INPUT_2BYTES(cinfo, cinfo->image_width, return FALSE);

-  INPUT_BYTE(cinfo, cinfo->num_components, return FALSE);

-

-  length -= 8;

-

-  TRACEMS4(cinfo, 1, JTRC_SOF, cinfo->unread_marker,

-           (int) cinfo->image_width, (int) cinfo->image_height,

-           cinfo->num_components);

-

-  if (cinfo->marker->saw_SOF)

-    ERREXIT(cinfo, JERR_SOF_DUPLICATE);

-

-  /* We don't support files in which the image height is initially specified */

-  /* as 0 and is later redefined by DNL.  As long as we have to check that,  */

-  /* might as well have a general sanity check. */

-  if (cinfo->image_height <= 0 || cinfo->image_width <= 0

-      || cinfo->num_components <= 0)

-    ERREXIT(cinfo, JERR_EMPTY_IMAGE);

-

-  if (length != (cinfo->num_components * 3))

-    ERREXIT(cinfo, JERR_BAD_LENGTH);

-

-  if (cinfo->comp_info == NULL) /* do only once, even if suspend */

-    cinfo->comp_info = (jpeg_component_info *) (*cinfo->mem->alloc_small)

-                        ((j_common_ptr) cinfo, JPOOL_IMAGE,

-                         cinfo->num_components * SIZEOF(jpeg_component_info));

-  

-  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

-       ci++, compptr++) {

-    compptr->component_index = ci;

-    INPUT_BYTE(cinfo, compptr->component_id, return FALSE);

-    INPUT_BYTE(cinfo, c, return FALSE);

-    compptr->h_samp_factor = (c >> 4) & 15;

-    compptr->v_samp_factor = (c     ) & 15;

-    INPUT_BYTE(cinfo, compptr->quant_tbl_no, return FALSE);

-

-    TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT,

-             compptr->component_id, compptr->h_samp_factor,

-             compptr->v_samp_factor, compptr->quant_tbl_no);

-  }

-

-  cinfo->marker->saw_SOF = TRUE;

-

-  INPUT_SYNC(cinfo);

-  return TRUE;

-}

-

-

-LOCAL(boolean)

-get_sos (j_decompress_ptr cinfo)

-/* Process a SOS marker */

-{

-  INT32 length;

-  int i, ci, n, c, cc;

-  jpeg_component_info * compptr;

-  INPUT_VARS(cinfo);

-

-  if (! cinfo->marker->saw_SOF)

-    ERREXIT(cinfo, JERR_SOS_NO_SOF);

-

-  INPUT_2BYTES(cinfo, length, return FALSE);

-

-  INPUT_BYTE(cinfo, n, return FALSE); /* Number of components */

-

-  TRACEMS1(cinfo, 1, JTRC_SOS, n);

-

-  if (length != (n * 2 + 6) || n > MAX_COMPS_IN_SCAN ||

-      (n == 0 && !cinfo->progressive_mode))

-      /* pseudo SOS marker only allowed in progressive mode */

-    ERREXIT(cinfo, JERR_BAD_LENGTH);

-

-  cinfo->comps_in_scan = n;

-

-  /* Collect the component-spec parameters */

-

-  for (i = 0; i < n; i++) {

-    INPUT_BYTE(cinfo, cc, return FALSE);

-    INPUT_BYTE(cinfo, c, return FALSE);

-    

-    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

-         ci++, compptr++) {

-      if (cc == compptr->component_id)

-        goto id_found;

-    }

-

-    ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc);

-

-  id_found:

-

-    cinfo->cur_comp_info[i] = compptr;

-    compptr->dc_tbl_no = (c >> 4) & 15;

-    compptr->ac_tbl_no = (c     ) & 15;

-    

-    TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc,

-             compptr->dc_tbl_no, compptr->ac_tbl_no);

-  }

-

-  /* Collect the additional scan parameters Ss, Se, Ah/Al. */

-  INPUT_BYTE(cinfo, c, return FALSE);

-  cinfo->Ss = c;

-  INPUT_BYTE(cinfo, c, return FALSE);

-  cinfo->Se = c;

-  INPUT_BYTE(cinfo, c, return FALSE);

-  cinfo->Ah = (c >> 4) & 15;

-  cinfo->Al = (c     ) & 15;

-

-  TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo->Ss, cinfo->Se,

-           cinfo->Ah, cinfo->Al);

-

-  /* Prepare to scan data & restart markers */

-  cinfo->marker->next_restart_num = 0;

-

-  /* Count another (non-pseudo) SOS marker */

-  if (n) cinfo->input_scan_number++;

-

-  INPUT_SYNC(cinfo);

-  return TRUE;

-}

-

-

-#ifdef D_ARITH_CODING_SUPPORTED

-

-LOCAL(boolean)

-get_dac (j_decompress_ptr cinfo)

-/* Process a DAC marker */

-{

-  INT32 length;

-  int index, val;

-  INPUT_VARS(cinfo);

-

-  INPUT_2BYTES(cinfo, length, return FALSE);

-  length -= 2;

-  

-  while (length > 0) {

-    INPUT_BYTE(cinfo, index, return FALSE);

-    INPUT_BYTE(cinfo, val, return FALSE);

-

-    length -= 2;

-

-    TRACEMS2(cinfo, 1, JTRC_DAC, index, val);

-

-    if (index < 0 || index >= (2*NUM_ARITH_TBLS))

-      ERREXIT1(cinfo, JERR_DAC_INDEX, index);

-

-    if (index >= NUM_ARITH_TBLS) { /* define AC table */

-      cinfo->arith_ac_K[index-NUM_ARITH_TBLS] = (UINT8) val;

-    } else {                    /* define DC table */

-      cinfo->arith_dc_L[index] = (UINT8) (val & 0x0F);

-      cinfo->arith_dc_U[index] = (UINT8) (val >> 4);

-      if (cinfo->arith_dc_L[index] > cinfo->arith_dc_U[index])

-        ERREXIT1(cinfo, JERR_DAC_VALUE, val);

-    }

-  }

-

-  if (length != 0)

-    ERREXIT(cinfo, JERR_BAD_LENGTH);

-

-  INPUT_SYNC(cinfo);

-  return TRUE;

-}

-

-#else /* ! D_ARITH_CODING_SUPPORTED */

-

-#define get_dac(cinfo)  skip_variable(cinfo)

-

-#endif /* D_ARITH_CODING_SUPPORTED */

-

-

-LOCAL(boolean)

-get_dht (j_decompress_ptr cinfo)

-/* Process a DHT marker */

-{

-  INT32 length;

-  UINT8 bits[17];

-  UINT8 huffval[256];

-  int i, index, count;

-  JHUFF_TBL **htblptr;

-  INPUT_VARS(cinfo);

-

-  INPUT_2BYTES(cinfo, length, return FALSE);

-  length -= 2;

-  

-  while (length > 16) {

-    INPUT_BYTE(cinfo, index, return FALSE);

-

-    TRACEMS1(cinfo, 1, JTRC_DHT, index);

-      

-    bits[0] = 0;

-    count = 0;

-    for (i = 1; i <= 16; i++) {

-      INPUT_BYTE(cinfo, bits[i], return FALSE);

-      count += bits[i];

-    }

-

-    length -= 1 + 16;

-

-    TRACEMS8(cinfo, 2, JTRC_HUFFBITS,

-             bits[1], bits[2], bits[3], bits[4],

-             bits[5], bits[6], bits[7], bits[8]);

-    TRACEMS8(cinfo, 2, JTRC_HUFFBITS,

-             bits[9], bits[10], bits[11], bits[12],

-             bits[13], bits[14], bits[15], bits[16]);

-

-    /* Here we just do minimal validation of the counts to avoid walking

-     * off the end of our table space.  jdhuff.c will check more carefully.

-     */

-    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, count, i;

-  int n, prec;

-  unsigned int tmp;

-  JQUANT_TBL *quant_ptr;

-  const int *natural_order;

-  INPUT_VARS(cinfo);

-

-  INPUT_2BYTES(cinfo, length, return FALSE);

-  length -= 2;

-

-  while (length > 0) {

-    length--;

-    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];

-

-    if (prec) {

-      if (length < DCTSIZE2 * 2) {

-        /* Initialize full table for safety. */

-        for (i = 0; i < DCTSIZE2; i++) {

-          quant_ptr->quantval[i] = 1;

-        }

-        count = length >> 1;

-      } else

-        count = DCTSIZE2;

-    } else {

-      if (length < DCTSIZE2) {

-        /* Initialize full table for safety. */

-        for (i = 0; i < DCTSIZE2; i++) {

-          quant_ptr->quantval[i] = 1;

-        }

-        count = length;

-      } else

-        count = DCTSIZE2;

-    }

-

-    switch (count) {

-    case (2*2): natural_order = jpeg_natural_order2; break;

-    case (3*3): natural_order = jpeg_natural_order3; break;

-    case (4*4): natural_order = jpeg_natural_order4; break;

-    case (5*5): natural_order = jpeg_natural_order5; break;

-    case (6*6): natural_order = jpeg_natural_order6; break;

-    case (7*7): natural_order = jpeg_natural_order7; break;

-    default:    natural_order = jpeg_natural_order;  break;

-    }

-

-    for (i = 0; i < count; 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[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;

-}

-

-

-/*

- * 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_SUPPORTED

-

-METHODDEF(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) {

-    WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c);

-    cinfo->marker->discarded_bytes = 0;

-  }

-

-  cinfo->unread_marker = c;

-

-  INPUT_SYNC(cinfo);

-  return TRUE;

-}

-

-

-LOCAL(boolean)

-first_marker (j_decompress_ptr cinfo)

-/* Like next_marker, but used to obtain the initial SOI marker. */

-/* For this marker, we do not allow preceding garbage or fill; otherwise,

- * we might well scan an entire input file before realizing it ain't JPEG.

- * If an application wants to process non-JFIF files, it must seek to the

- * SOI before calling the JPEG library.

- */

-{

-  int c, c2;

-  INPUT_VARS(cinfo);

-

-  INPUT_BYTE(cinfo, c, return FALSE);

-  INPUT_BYTE(cinfo, c2, return FALSE);

-  if (c != 0xFF || c2 != (int) M_SOI)

-    ERREXIT2(cinfo, JERR_NO_SOI, c, c2);

-

-  cinfo->unread_marker = c2;

-

-  INPUT_SYNC(cinfo);

-  return TRUE;

-}

-

-

-/*

- * Read markers until SOS or EOI.

- *

- * Returns same codes as are defined for jpeg_consume_input:

- * 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_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;

-      

-    case M_COM:

-      if (! (*((my_marker_ptr) cinfo->marker)->process_COM) (cinfo))

-        return JPEG_SUSPENDED;

-      break;

-

-    case M_RST0:                /* these are all parameterless */

-    case M_RST1:

-    case M_RST2:

-    case M_RST3:

-    case M_RST4:

-    case M_RST5:

-    case M_RST6:

-    case M_RST7:

-    case M_TEM:

-      TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo->unread_marker);

-      break;

-

-    case M_DNL:                 /* Ignore DNL ... perhaps the wrong thing */

-      if (! skip_variable(cinfo))

-        return JPEG_SUSPENDED;

-      break;

-

-    default:                    /* must be DHP, EXP, JPGn, or RESn */

-      /* For now, we treat the reserved markers as fatal errors since they are

-       * likely to be used to signal incompatible JPEG Part 3 extensions.

-       * Once the JPEG 3 version-number marker is well defined, this code

-       * ought to change!

-       */

-      ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);

-      break;

-    }

-    /* Successfully processed marker, so reset state variable */

-    cinfo->unread_marker = 0;

-  } /* end loop */

-}

-

-

-/*

- * Read a restart marker, which is expected to appear next in the datastream;

- * if the marker is not there, take appropriate recovery action.

- * Returns FALSE if suspension is required.

- *

- * This is called by the entropy decoder after it has read an appropriate

- * number of MCUs.  cinfo->unread_marker may be nonzero if the entropy decoder

- * has already read a marker from the data source.  Under normal conditions

- * cinfo->unread_marker will be reset to 0 before returning; if not reset,

- * it holds a marker which the decoder will be unable to read past.

- */

-

-METHODDEF(boolean)

-read_restart_marker (j_decompress_ptr cinfo)

-{

-  /* Obtain a marker unless we already did. */

-  /* Note that next_marker will complain if it skips any data. */

-  if (cinfo->unread_marker == 0) {

-    if (! next_marker(cinfo))

-      return FALSE;

-  }

-

-  if (cinfo->unread_marker ==

-      ((int) M_RST0 + cinfo->marker->next_restart_num)) {

-    /* Normal case --- swallow the marker and let entropy decoder continue */

-    TRACEMS1(cinfo, 3, JTRC_RST, cinfo->marker->next_restart_num);

-    cinfo->unread_marker = 0;

-  } else {

-    /* Uh-oh, the restart markers have been messed up. */

-    /* Let the data source manager determine how to resync. */

-    if (! (*cinfo->src->resync_to_restart) (cinfo,

-                                            cinfo->marker->next_restart_num))

-      return FALSE;

-  }

-

-  /* Update next-restart state */

-  cinfo->marker->next_restart_num = (cinfo->marker->next_restart_num + 1) & 7;

-

-  return TRUE;

-}

-

-

-/*

- * This is the default resync_to_restart method for data source managers

- * to use if they don't have any better approach.  Some data source managers

- * may be able to back up, or may have additional knowledge about the data

- * which permits a more intelligent recovery strategy; such managers would

- * presumably supply their own resync method.

- *

- * read_restart_marker calls resync_to_restart if it finds a marker other than

- * the restart marker it was expecting.  (This code is *not* used unless

- * a nonzero restart interval has been declared.)  cinfo->unread_marker is

- * the marker code actually found (might be anything, except 0 or FF).

- * The desired restart marker number (0..7) is passed as a parameter.

- * This routine is supposed to apply whatever error recovery strategy seems

- * appropriate in order to position the input stream to the next data segment.

- * Note that cinfo->unread_marker is treated as a marker appearing before

- * the current data-source input point; usually it should be reset to zero

- * before returning.

- * Returns FALSE if suspension is required.

- *

- * This implementation is substantially constrained by wanting to treat the

- * input as a data stream; this means we can't back up.  Therefore, we have

- * only the following actions to work with:

- *   1. Simply discard the marker and let the entropy decoder resume at next

- *      byte of file.

- *   2. Read forward until we find another marker, discarding intervening

- *      data.  (In theory we could look ahead within the current bufferload,

- *      without having to discard data if we don't find the desired marker.

- *      This idea is not implemented here, in part because it makes behavior

- *      dependent on buffer size and chance buffer-boundary positions.)

- *   3. Leave the marker unread (by failing to zero cinfo->unread_marker).

- *      This will cause the entropy decoder to process an empty data segment,

- *      inserting dummy zeroes, and then we will reprocess the marker.

- *

- * #2 is appropriate if we think the desired marker lies ahead, while #3 is

- * appropriate if the found marker is a future restart marker (indicating

- * that we have missed the desired restart marker, probably because it got

- * corrupted).

- * We apply #2 or #3 if the found marker is a restart marker no more than

- * two counts behind or ahead of the expected one.  We also apply #2 if the

- * found marker is not a legal JPEG marker code (it's certainly bogus data).

- * If the found marker is a restart marker more than 2 counts away, we do #1

- * (too much risk that the marker is erroneous; with luck we will be able to

- * resync at some future point).

- * For any valid non-restart JPEG marker, we apply #3.  This keeps us from

- * overrunning the end of a scan.  An implementation limited to single-scan

- * files might find it better to apply #2 for markers other than EOI, since

- * any other marker would have to be bogus data in that case.

- */

-

-GLOBAL(boolean)

-jpeg_resync_to_restart (j_decompress_ptr cinfo, int desired)

-{

-  int marker = cinfo->unread_marker;

-  int action = 1;

-  

-  /* Always put up a warning. */

-  WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired);

-  

-  /* Outer loop handles repeated decision after scanning forward. */

-  for (;;) {

-    if (marker < (int) M_SOF0)

-      action = 2;               /* invalid marker */

-    else if (marker < (int) M_RST0 || marker > (int) M_RST7)

-      action = 3;               /* valid non-restart marker */

-    else {

-      if (marker == ((int) M_RST0 + ((desired+1) & 7)) ||

-          marker == ((int) M_RST0 + ((desired+2) & 7)))

-        action = 3;             /* one of the next two expected restarts */

-      else if (marker == ((int) M_RST0 + ((desired-1) & 7)) ||

-               marker == ((int) M_RST0 + ((desired-2) & 7)))

-        action = 2;             /* a prior restart, so advance */

-      else

-        action = 1;             /* desired restart or too far away */

-    }

-    TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action);

-    switch (action) {

-    case 1:

-      /* Discard marker and let entropy decoder resume processing. */

-      cinfo->unread_marker = 0;

-      return TRUE;

-    case 2:

-      /* Scan to the next marker, and repeat the decision loop. */

-      if (! next_marker(cinfo))

-        return FALSE;

-      marker = cinfo->unread_marker;

-      break;

-    case 3:

-      /* Return without advancing past this marker. */

-      /* Entropy decoder will be forced to process an empty segment. */

-      return TRUE;

-    }

-  } /* end loop */

-}

-

-

-/*

- * Reset marker processing state to begin a fresh datastream.

- */

-

-METHODDEF(void)

-reset_marker_reader (j_decompress_ptr cinfo)

-{

-  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;

-

-  cinfo->comp_info = NULL;              /* until allocated by get_sof */

-  cinfo->input_scan_number = 0;         /* no SOS seen yet */

-  cinfo->unread_marker = 0;             /* no pending marker */

-  marker->pub.saw_SOI = FALSE;          /* set internal state too */

-  marker->pub.saw_SOF = FALSE;

-  marker->pub.discarded_bytes = 0;

-  marker->cur_marker = NULL;

-}

-

-

-/*

- * Initialize the marker reader module.

- * This is called only once, when the decompression object is created.

- */

-

-GLOBAL(void)

-jinit_marker_reader (j_decompress_ptr cinfo)

-{

-  my_marker_ptr marker;

-  int i;

-

-  /* Create subobject in permanent pool */

-  marker = (my_marker_ptr)

-    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,

-                                SIZEOF(my_marker_reader));

-  cinfo->marker = (struct jpeg_marker_reader *) marker;

-  /* Initialize public method pointers */

-  marker->pub.reset_marker_reader = reset_marker_reader;

-  marker->pub.read_markers = read_markers;

-  marker->pub.read_restart_marker = read_restart_marker;

-  /* Initialize COM/APPn processing.

-   * By default, we examine and then discard APP0 and APP14,

-   * but simply discard COM and all other APPn.

-   */

-  marker->process_COM = skip_variable;

-  marker->length_limit_COM = 0;

-  for (i = 0; i < 16; i++) {

-    marker->process_APPn[i] = skip_variable;

-    marker->length_limit_APPn[i] = 0;

-  }

-  marker->process_APPn[0] = get_interesting_appn;

-  marker->process_APPn[14] = get_interesting_appn;

-  /* Reset marker processing state */

-  reset_marker_reader(cinfo);

-}

-

-

-/*

- * Control saving of COM and APPn markers into marker_list.

- */

-

-#ifdef SAVE_MARKERS_SUPPORTED

-

-GLOBAL(void)

-jpeg_save_markers (j_decompress_ptr cinfo, int marker_code,

-                   unsigned int length_limit)

-{

-  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;

-  long maxlength;

-  jpeg_marker_parser_method processor;

-

-  /* Length limit mustn't be larger than what we can allocate

-   * (should only be a concern in a 16-bit environment).

-   */

-  maxlength = cinfo->mem->max_alloc_chunk - SIZEOF(struct jpeg_marker_struct);

-  if (((long) length_limit) > maxlength)

-    length_limit = (unsigned int) maxlength;

-

-  /* Choose processor routine to use.

-   * APP0/APP14 have special requirements.

-   */

-  if (length_limit) {

-    processor = save_marker;

-    /* If saving APP0/APP14, save at least enough for our internal use. */

-    if (marker_code == (int) M_APP0 && length_limit < APP0_DATA_LEN)

-      length_limit = APP0_DATA_LEN;

-    else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN)

-      length_limit = APP14_DATA_LEN;

-  } else {

-    processor = skip_variable;

-    /* If discarding APP0/APP14, use our regular on-the-fly processor. */

-    if (marker_code == (int) M_APP0 || marker_code == (int) M_APP14)

-      processor = get_interesting_appn;

-  }

-

-  if (marker_code == (int) M_COM) {

-    marker->process_COM = processor;

-    marker->length_limit_COM = length_limit;

-  } else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) {

-    marker->process_APPn[marker_code - (int) M_APP0] = processor;

-    marker->length_limit_APPn[marker_code - (int) M_APP0] = length_limit;

-  } else

-    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);

-}

-

-#endif /* SAVE_MARKERS_SUPPORTED */

-

-

-/*

- * Install a special processing method for COM or APPn markers.

- */

-

-GLOBAL(void)

-jpeg_set_marker_processor (j_decompress_ptr cinfo, int marker_code,

-                           jpeg_marker_parser_method routine)

-{

-  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;

-

-  if (marker_code == (int) M_COM)

-    marker->process_COM = routine;

-  else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15)

-    marker->process_APPn[marker_code - (int) M_APP0] = routine;

-  else

-    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);

-}

+/*
+ * jdmarker.c
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * Modified 2009 by Guido Vollbeding.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains routines to decode JPEG datastream markers.
+ * Most of the complexity arises from our desire to support input
+ * suspension: if not all of the data for a marker is available,
+ * we must exit back to the application.  On resumption, we reprocess
+ * the marker.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+typedef enum {                  /* JPEG marker codes */
+  M_SOF0  = 0xc0,
+  M_SOF1  = 0xc1,
+  M_SOF2  = 0xc2,
+  M_SOF3  = 0xc3,
+  
+  M_SOF5  = 0xc5,
+  M_SOF6  = 0xc6,
+  M_SOF7  = 0xc7,
+  
+  M_JPG   = 0xc8,
+  M_SOF9  = 0xc9,
+  M_SOF10 = 0xca,
+  M_SOF11 = 0xcb,
+  
+  M_SOF13 = 0xcd,
+  M_SOF14 = 0xce,
+  M_SOF15 = 0xcf,
+  
+  M_DHT   = 0xc4,
+  
+  M_DAC   = 0xcc,
+  
+  M_RST0  = 0xd0,
+  M_RST1  = 0xd1,
+  M_RST2  = 0xd2,
+  M_RST3  = 0xd3,
+  M_RST4  = 0xd4,
+  M_RST5  = 0xd5,
+  M_RST6  = 0xd6,
+  M_RST7  = 0xd7,
+  
+  M_SOI   = 0xd8,
+  M_EOI   = 0xd9,
+  M_SOS   = 0xda,
+  M_DQT   = 0xdb,
+  M_DNL   = 0xdc,
+  M_DRI   = 0xdd,
+  M_DHP   = 0xde,
+  M_EXP   = 0xdf,
+  
+  M_APP0  = 0xe0,
+  M_APP1  = 0xe1,
+  M_APP2  = 0xe2,
+  M_APP3  = 0xe3,
+  M_APP4  = 0xe4,
+  M_APP5  = 0xe5,
+  M_APP6  = 0xe6,
+  M_APP7  = 0xe7,
+  M_APP8  = 0xe8,
+  M_APP9  = 0xe9,
+  M_APP10 = 0xea,
+  M_APP11 = 0xeb,
+  M_APP12 = 0xec,
+  M_APP13 = 0xed,
+  M_APP14 = 0xee,
+  M_APP15 = 0xef,
+  
+  M_JPG0  = 0xf0,
+  M_JPG13 = 0xfd,
+  M_COM   = 0xfe,
+  
+  M_TEM   = 0x01,
+  
+  M_ERROR = 0x100
+} JPEG_MARKER;
+
+
+/* Private state */
+
+typedef struct {
+  struct jpeg_marker_reader pub; /* public fields */
+
+  /* Application-overridable marker processing methods */
+  jpeg_marker_parser_method process_COM;
+  jpeg_marker_parser_method process_APPn[16];
+
+  /* Limit on marker data length to save for each marker type */
+  unsigned int length_limit_COM;
+  unsigned int length_limit_APPn[16];
+
+  /* Status of COM/APPn marker saving */
+  jpeg_saved_marker_ptr cur_marker;     /* NULL if not processing a marker */
+  unsigned int bytes_read;              /* data bytes read so far in marker */
+  /* Note: cur_marker is not linked into marker_list until it's all read. */
+} my_marker_reader;
+
+typedef my_marker_reader * my_marker_ptr;
+
+
+/*
+ * Macros for fetching data from the data source module.
+ *
+ * At all times, cinfo->src->next_input_byte and ->bytes_in_buffer reflect
+ * the current restart point; we update them only when we have reached a
+ * suitable place to restart if a suspension occurs.
+ */
+
+/* Declare and initialize local copies of input pointer/count */
+#define INPUT_VARS(cinfo)  \
+        struct jpeg_source_mgr * datasrc = (cinfo)->src;  \
+        const JOCTET * next_input_byte = datasrc->next_input_byte;  \
+        size_t bytes_in_buffer = datasrc->bytes_in_buffer
+
+/* Unload the local copies --- do this only at a restart boundary */
+#define INPUT_SYNC(cinfo)  \
+        ( datasrc->next_input_byte = next_input_byte,  \
+          datasrc->bytes_in_buffer = bytes_in_buffer )
+
+/* Reload the local copies --- used only in MAKE_BYTE_AVAIL */
+#define INPUT_RELOAD(cinfo)  \
+        ( next_input_byte = datasrc->next_input_byte,  \
+          bytes_in_buffer = datasrc->bytes_in_buffer )
+
+/* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available.
+ * Note we do *not* do INPUT_SYNC before calling fill_input_buffer,
+ * but we must reload the local copies after a successful fill.
+ */
+#define MAKE_BYTE_AVAIL(cinfo,action)  \
+        if (bytes_in_buffer == 0) {  \
+          if (! (*datasrc->fill_input_buffer) (cinfo))  \
+            { action; }  \
+          INPUT_RELOAD(cinfo);  \
+        }
+
+/* Read a byte into variable V.
+ * If must suspend, take the specified action (typically "return FALSE").
+ */
+#define INPUT_BYTE(cinfo,V,action)  \
+        MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
+                  bytes_in_buffer--; \
+                  V = GETJOCTET(*next_input_byte++); )
+
+/* As above, but read two bytes interpreted as an unsigned 16-bit integer.
+ * V should be declared unsigned int or perhaps INT32.
+ */
+#define INPUT_2BYTES(cinfo,V,action)  \
+        MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
+                  bytes_in_buffer--; \
+                  V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \
+                  MAKE_BYTE_AVAIL(cinfo,action); \
+                  bytes_in_buffer--; \
+                  V += GETJOCTET(*next_input_byte++); )
+
+
+/*
+ * Routines to process JPEG markers.
+ *
+ * Entry condition: JPEG marker itself has been read and its code saved
+ *   in cinfo->unread_marker; input restart point is just after the marker.
+ *
+ * Exit: if return TRUE, have read and processed any parameters, and have
+ *   updated the restart point to point after the parameters.
+ *   If return FALSE, was forced to suspend before reaching end of
+ *   marker parameters; restart point has not been moved.  Same routine
+ *   will be called again after application supplies more input data.
+ *
+ * This approach to suspension assumes that all of a marker's parameters
+ * can fit into a single input bufferload.  This should hold for "normal"
+ * markers.  Some COM/APPn markers might have large parameter segments
+ * that might not fit.  If we are simply dropping such a marker, we use
+ * skip_input_data to get past it, and thereby put the problem on the
+ * source manager's shoulders.  If we are saving the marker's contents
+ * into memory, we use a slightly different convention: when forced to
+ * suspend, the marker processor updates the restart point to the end of
+ * what its consumed (ie, the end of the buffer) before returning FALSE.
+ * On resumption, cinfo->unread_marker still contains the marker code,
+ * but the data source will point to the next chunk of marker data.
+ * The marker processor must retain internal state to deal with this.
+ *
+ * Note that we don't bother to avoid duplicate trace messages if a
+ * suspension occurs within marker parameters.  Other side effects
+ * require more care.
+ */
+
+
+LOCAL(boolean)
+get_soi (j_decompress_ptr cinfo)
+/* Process an SOI marker */
+{
+  int i;
+  
+  TRACEMS(cinfo, 1, JTRC_SOI);
+
+  if (cinfo->marker->saw_SOI)
+    ERREXIT(cinfo, JERR_SOI_DUPLICATE);
+
+  /* Reset all parameters that are defined to be reset by SOI */
+
+  for (i = 0; i < NUM_ARITH_TBLS; i++) {
+    cinfo->arith_dc_L[i] = 0;
+    cinfo->arith_dc_U[i] = 1;
+    cinfo->arith_ac_K[i] = 5;
+  }
+  cinfo->restart_interval = 0;
+
+  /* Set initial assumptions for colorspace etc */
+
+  cinfo->jpeg_color_space = JCS_UNKNOWN;
+  cinfo->CCIR601_sampling = FALSE; /* Assume non-CCIR sampling??? */
+
+  cinfo->saw_JFIF_marker = FALSE;
+  cinfo->JFIF_major_version = 1; /* set default JFIF APP0 values */
+  cinfo->JFIF_minor_version = 1;
+  cinfo->density_unit = 0;
+  cinfo->X_density = 1;
+  cinfo->Y_density = 1;
+  cinfo->saw_Adobe_marker = FALSE;
+  cinfo->Adobe_transform = 0;
+
+  cinfo->marker->saw_SOI = TRUE;
+
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+get_sof (j_decompress_ptr cinfo, boolean is_baseline, boolean is_prog,
+         boolean is_arith)
+/* Process a SOFn marker */
+{
+  INT32 length;
+  int c, ci;
+  jpeg_component_info * compptr;
+  INPUT_VARS(cinfo);
+
+  cinfo->is_baseline = is_baseline;
+  cinfo->progressive_mode = is_prog;
+  cinfo->arith_code = is_arith;
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+
+  INPUT_BYTE(cinfo, cinfo->data_precision, return FALSE);
+  INPUT_2BYTES(cinfo, cinfo->image_height, return FALSE);
+  INPUT_2BYTES(cinfo, cinfo->image_width, return FALSE);
+  INPUT_BYTE(cinfo, cinfo->num_components, return FALSE);
+
+  length -= 8;
+
+  TRACEMS4(cinfo, 1, JTRC_SOF, cinfo->unread_marker,
+           (int) cinfo->image_width, (int) cinfo->image_height,
+           cinfo->num_components);
+
+  if (cinfo->marker->saw_SOF)
+    ERREXIT(cinfo, JERR_SOF_DUPLICATE);
+
+  /* We don't support files in which the image height is initially specified */
+  /* as 0 and is later redefined by DNL.  As long as we have to check that,  */
+  /* might as well have a general sanity check. */
+  if (cinfo->image_height <= 0 || cinfo->image_width <= 0
+      || cinfo->num_components <= 0)
+    ERREXIT(cinfo, JERR_EMPTY_IMAGE);
+
+  if (length != (cinfo->num_components * 3))
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  if (cinfo->comp_info == NULL) /* do only once, even if suspend */
+    cinfo->comp_info = (jpeg_component_info *) (*cinfo->mem->alloc_small)
+                        ((j_common_ptr) cinfo, JPOOL_IMAGE,
+                         cinfo->num_components * SIZEOF(jpeg_component_info));
+  
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    compptr->component_index = ci;
+    INPUT_BYTE(cinfo, compptr->component_id, return FALSE);
+    INPUT_BYTE(cinfo, c, return FALSE);
+    compptr->h_samp_factor = (c >> 4) & 15;
+    compptr->v_samp_factor = (c     ) & 15;
+    INPUT_BYTE(cinfo, compptr->quant_tbl_no, return FALSE);
+
+    TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT,
+             compptr->component_id, compptr->h_samp_factor,
+             compptr->v_samp_factor, compptr->quant_tbl_no);
+  }
+
+  cinfo->marker->saw_SOF = TRUE;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+get_sos (j_decompress_ptr cinfo)
+/* Process a SOS marker */
+{
+  INT32 length;
+  int i, ci, n, c, cc;
+  jpeg_component_info * compptr;
+  INPUT_VARS(cinfo);
+
+  if (! cinfo->marker->saw_SOF)
+    ERREXIT(cinfo, JERR_SOS_NO_SOF);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+
+  INPUT_BYTE(cinfo, n, return FALSE); /* Number of components */
+
+  TRACEMS1(cinfo, 1, JTRC_SOS, n);
+
+  if (length != (n * 2 + 6) || n > MAX_COMPS_IN_SCAN ||
+      (n == 0 && !cinfo->progressive_mode))
+      /* pseudo SOS marker only allowed in progressive mode */
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  cinfo->comps_in_scan = n;
+
+  /* Collect the component-spec parameters */
+
+  for (i = 0; i < n; i++) {
+    INPUT_BYTE(cinfo, cc, return FALSE);
+    INPUT_BYTE(cinfo, c, return FALSE);
+    
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+         ci++, compptr++) {
+      if (cc == compptr->component_id)
+        goto id_found;
+    }
+
+    ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc);
+
+  id_found:
+
+    cinfo->cur_comp_info[i] = compptr;
+    compptr->dc_tbl_no = (c >> 4) & 15;
+    compptr->ac_tbl_no = (c     ) & 15;
+    
+    TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc,
+             compptr->dc_tbl_no, compptr->ac_tbl_no);
+  }
+
+  /* Collect the additional scan parameters Ss, Se, Ah/Al. */
+  INPUT_BYTE(cinfo, c, return FALSE);
+  cinfo->Ss = c;
+  INPUT_BYTE(cinfo, c, return FALSE);
+  cinfo->Se = c;
+  INPUT_BYTE(cinfo, c, return FALSE);
+  cinfo->Ah = (c >> 4) & 15;
+  cinfo->Al = (c     ) & 15;
+
+  TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo->Ss, cinfo->Se,
+           cinfo->Ah, cinfo->Al);
+
+  /* Prepare to scan data & restart markers */
+  cinfo->marker->next_restart_num = 0;
+
+  /* Count another (non-pseudo) SOS marker */
+  if (n) cinfo->input_scan_number++;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+#ifdef D_ARITH_CODING_SUPPORTED
+
+LOCAL(boolean)
+get_dac (j_decompress_ptr cinfo)
+/* Process a DAC marker */
+{
+  INT32 length;
+  int index, val;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  length -= 2;
+  
+  while (length > 0) {
+    INPUT_BYTE(cinfo, index, return FALSE);
+    INPUT_BYTE(cinfo, val, return FALSE);
+
+    length -= 2;
+
+    TRACEMS2(cinfo, 1, JTRC_DAC, index, val);
+
+    if (index < 0 || index >= (2*NUM_ARITH_TBLS))
+      ERREXIT1(cinfo, JERR_DAC_INDEX, index);
+
+    if (index >= NUM_ARITH_TBLS) { /* define AC table */
+      cinfo->arith_ac_K[index-NUM_ARITH_TBLS] = (UINT8) val;
+    } else {                    /* define DC table */
+      cinfo->arith_dc_L[index] = (UINT8) (val & 0x0F);
+      cinfo->arith_dc_U[index] = (UINT8) (val >> 4);
+      if (cinfo->arith_dc_L[index] > cinfo->arith_dc_U[index])
+        ERREXIT1(cinfo, JERR_DAC_VALUE, val);
+    }
+  }
+
+  if (length != 0)
+    ERREXIT(cinfo, JERR_BAD_LENGTH);
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+#else /* ! D_ARITH_CODING_SUPPORTED */
+
+#define get_dac(cinfo)  skip_variable(cinfo)
+
+#endif /* D_ARITH_CODING_SUPPORTED */
+
+
+LOCAL(boolean)
+get_dht (j_decompress_ptr cinfo)
+/* Process a DHT marker */
+{
+  INT32 length;
+  UINT8 bits[17];
+  UINT8 huffval[256];
+  int i, index, count;
+  JHUFF_TBL **htblptr;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  length -= 2;
+  
+  while (length > 16) {
+    INPUT_BYTE(cinfo, index, return FALSE);
+
+    TRACEMS1(cinfo, 1, JTRC_DHT, index);
+      
+    bits[0] = 0;
+    count = 0;
+    for (i = 1; i <= 16; i++) {
+      INPUT_BYTE(cinfo, bits[i], return FALSE);
+      count += bits[i];
+    }
+
+    length -= 1 + 16;
+
+    TRACEMS8(cinfo, 2, JTRC_HUFFBITS,
+             bits[1], bits[2], bits[3], bits[4],
+             bits[5], bits[6], bits[7], bits[8]);
+    TRACEMS8(cinfo, 2, JTRC_HUFFBITS,
+             bits[9], bits[10], bits[11], bits[12],
+             bits[13], bits[14], bits[15], bits[16]);
+
+    /* Here we just do minimal validation of the counts to avoid walking
+     * off the end of our table space.  jdhuff.c will check more carefully.
+     */
+    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, count, i;
+  int n, prec;
+  unsigned int tmp;
+  JQUANT_TBL *quant_ptr;
+  const int *natural_order;
+  INPUT_VARS(cinfo);
+
+  INPUT_2BYTES(cinfo, length, return FALSE);
+  length -= 2;
+
+  while (length > 0) {
+    length--;
+    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];
+
+    if (prec) {
+      if (length < DCTSIZE2 * 2) {
+        /* Initialize full table for safety. */
+        for (i = 0; i < DCTSIZE2; i++) {
+          quant_ptr->quantval[i] = 1;
+        }
+        count = length >> 1;
+      } else
+        count = DCTSIZE2;
+    } else {
+      if (length < DCTSIZE2) {
+        /* Initialize full table for safety. */
+        for (i = 0; i < DCTSIZE2; i++) {
+          quant_ptr->quantval[i] = 1;
+        }
+        count = length;
+      } else
+        count = DCTSIZE2;
+    }
+
+    switch (count) {
+    case (2*2): natural_order = jpeg_natural_order2; break;
+    case (3*3): natural_order = jpeg_natural_order3; break;
+    case (4*4): natural_order = jpeg_natural_order4; break;
+    case (5*5): natural_order = jpeg_natural_order5; break;
+    case (6*6): natural_order = jpeg_natural_order6; break;
+    case (7*7): natural_order = jpeg_natural_order7; break;
+    default:    natural_order = jpeg_natural_order;  break;
+    }
+
+    for (i = 0; i < count; 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[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;
+}
+
+
+/*
+ * 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_SUPPORTED
+
+METHODDEF(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) {
+    WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c);
+    cinfo->marker->discarded_bytes = 0;
+  }
+
+  cinfo->unread_marker = c;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+LOCAL(boolean)
+first_marker (j_decompress_ptr cinfo)
+/* Like next_marker, but used to obtain the initial SOI marker. */
+/* For this marker, we do not allow preceding garbage or fill; otherwise,
+ * we might well scan an entire input file before realizing it ain't JPEG.
+ * If an application wants to process non-JFIF files, it must seek to the
+ * SOI before calling the JPEG library.
+ */
+{
+  int c, c2;
+  INPUT_VARS(cinfo);
+
+  INPUT_BYTE(cinfo, c, return FALSE);
+  INPUT_BYTE(cinfo, c2, return FALSE);
+  if (c != 0xFF || c2 != (int) M_SOI)
+    ERREXIT2(cinfo, JERR_NO_SOI, c, c2);
+
+  cinfo->unread_marker = c2;
+
+  INPUT_SYNC(cinfo);
+  return TRUE;
+}
+
+
+/*
+ * Read markers until SOS or EOI.
+ *
+ * Returns same codes as are defined for jpeg_consume_input:
+ * 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_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;
+      
+    case M_COM:
+      if (! (*((my_marker_ptr) cinfo->marker)->process_COM) (cinfo))
+        return JPEG_SUSPENDED;
+      break;
+
+    case M_RST0:                /* these are all parameterless */
+    case M_RST1:
+    case M_RST2:
+    case M_RST3:
+    case M_RST4:
+    case M_RST5:
+    case M_RST6:
+    case M_RST7:
+    case M_TEM:
+      TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo->unread_marker);
+      break;
+
+    case M_DNL:                 /* Ignore DNL ... perhaps the wrong thing */
+      if (! skip_variable(cinfo))
+        return JPEG_SUSPENDED;
+      break;
+
+    default:                    /* must be DHP, EXP, JPGn, or RESn */
+      /* For now, we treat the reserved markers as fatal errors since they are
+       * likely to be used to signal incompatible JPEG Part 3 extensions.
+       * Once the JPEG 3 version-number marker is well defined, this code
+       * ought to change!
+       */
+      ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);
+      break;
+    }
+    /* Successfully processed marker, so reset state variable */
+    cinfo->unread_marker = 0;
+  } /* end loop */
+}
+
+
+/*
+ * Read a restart marker, which is expected to appear next in the datastream;
+ * if the marker is not there, take appropriate recovery action.
+ * Returns FALSE if suspension is required.
+ *
+ * This is called by the entropy decoder after it has read an appropriate
+ * number of MCUs.  cinfo->unread_marker may be nonzero if the entropy decoder
+ * has already read a marker from the data source.  Under normal conditions
+ * cinfo->unread_marker will be reset to 0 before returning; if not reset,
+ * it holds a marker which the decoder will be unable to read past.
+ */
+
+METHODDEF(boolean)
+read_restart_marker (j_decompress_ptr cinfo)
+{
+  /* Obtain a marker unless we already did. */
+  /* Note that next_marker will complain if it skips any data. */
+  if (cinfo->unread_marker == 0) {
+    if (! next_marker(cinfo))
+      return FALSE;
+  }
+
+  if (cinfo->unread_marker ==
+      ((int) M_RST0 + cinfo->marker->next_restart_num)) {
+    /* Normal case --- swallow the marker and let entropy decoder continue */
+    TRACEMS1(cinfo, 3, JTRC_RST, cinfo->marker->next_restart_num);
+    cinfo->unread_marker = 0;
+  } else {
+    /* Uh-oh, the restart markers have been messed up. */
+    /* Let the data source manager determine how to resync. */
+    if (! (*cinfo->src->resync_to_restart) (cinfo,
+                                            cinfo->marker->next_restart_num))
+      return FALSE;
+  }
+
+  /* Update next-restart state */
+  cinfo->marker->next_restart_num = (cinfo->marker->next_restart_num + 1) & 7;
+
+  return TRUE;
+}
+
+
+/*
+ * This is the default resync_to_restart method for data source managers
+ * to use if they don't have any better approach.  Some data source managers
+ * may be able to back up, or may have additional knowledge about the data
+ * which permits a more intelligent recovery strategy; such managers would
+ * presumably supply their own resync method.
+ *
+ * read_restart_marker calls resync_to_restart if it finds a marker other than
+ * the restart marker it was expecting.  (This code is *not* used unless
+ * a nonzero restart interval has been declared.)  cinfo->unread_marker is
+ * the marker code actually found (might be anything, except 0 or FF).
+ * The desired restart marker number (0..7) is passed as a parameter.
+ * This routine is supposed to apply whatever error recovery strategy seems
+ * appropriate in order to position the input stream to the next data segment.
+ * Note that cinfo->unread_marker is treated as a marker appearing before
+ * the current data-source input point; usually it should be reset to zero
+ * before returning.
+ * Returns FALSE if suspension is required.
+ *
+ * This implementation is substantially constrained by wanting to treat the
+ * input as a data stream; this means we can't back up.  Therefore, we have
+ * only the following actions to work with:
+ *   1. Simply discard the marker and let the entropy decoder resume at next
+ *      byte of file.
+ *   2. Read forward until we find another marker, discarding intervening
+ *      data.  (In theory we could look ahead within the current bufferload,
+ *      without having to discard data if we don't find the desired marker.
+ *      This idea is not implemented here, in part because it makes behavior
+ *      dependent on buffer size and chance buffer-boundary positions.)
+ *   3. Leave the marker unread (by failing to zero cinfo->unread_marker).
+ *      This will cause the entropy decoder to process an empty data segment,
+ *      inserting dummy zeroes, and then we will reprocess the marker.
+ *
+ * #2 is appropriate if we think the desired marker lies ahead, while #3 is
+ * appropriate if the found marker is a future restart marker (indicating
+ * that we have missed the desired restart marker, probably because it got
+ * corrupted).
+ * We apply #2 or #3 if the found marker is a restart marker no more than
+ * two counts behind or ahead of the expected one.  We also apply #2 if the
+ * found marker is not a legal JPEG marker code (it's certainly bogus data).
+ * If the found marker is a restart marker more than 2 counts away, we do #1
+ * (too much risk that the marker is erroneous; with luck we will be able to
+ * resync at some future point).
+ * For any valid non-restart JPEG marker, we apply #3.  This keeps us from
+ * overrunning the end of a scan.  An implementation limited to single-scan
+ * files might find it better to apply #2 for markers other than EOI, since
+ * any other marker would have to be bogus data in that case.
+ */
+
+GLOBAL(boolean)
+jpeg_resync_to_restart (j_decompress_ptr cinfo, int desired)
+{
+  int marker = cinfo->unread_marker;
+  int action = 1;
+  
+  /* Always put up a warning. */
+  WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired);
+  
+  /* Outer loop handles repeated decision after scanning forward. */
+  for (;;) {
+    if (marker < (int) M_SOF0)
+      action = 2;               /* invalid marker */
+    else if (marker < (int) M_RST0 || marker > (int) M_RST7)
+      action = 3;               /* valid non-restart marker */
+    else {
+      if (marker == ((int) M_RST0 + ((desired+1) & 7)) ||
+          marker == ((int) M_RST0 + ((desired+2) & 7)))
+        action = 3;             /* one of the next two expected restarts */
+      else if (marker == ((int) M_RST0 + ((desired-1) & 7)) ||
+               marker == ((int) M_RST0 + ((desired-2) & 7)))
+        action = 2;             /* a prior restart, so advance */
+      else
+        action = 1;             /* desired restart or too far away */
+    }
+    TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action);
+    switch (action) {
+    case 1:
+      /* Discard marker and let entropy decoder resume processing. */
+      cinfo->unread_marker = 0;
+      return TRUE;
+    case 2:
+      /* Scan to the next marker, and repeat the decision loop. */
+      if (! next_marker(cinfo))
+        return FALSE;
+      marker = cinfo->unread_marker;
+      break;
+    case 3:
+      /* Return without advancing past this marker. */
+      /* Entropy decoder will be forced to process an empty segment. */
+      return TRUE;
+    }
+  } /* end loop */
+}
+
+
+/*
+ * Reset marker processing state to begin a fresh datastream.
+ */
+
+METHODDEF(void)
+reset_marker_reader (j_decompress_ptr cinfo)
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+
+  cinfo->comp_info = NULL;              /* until allocated by get_sof */
+  cinfo->input_scan_number = 0;         /* no SOS seen yet */
+  cinfo->unread_marker = 0;             /* no pending marker */
+  marker->pub.saw_SOI = FALSE;          /* set internal state too */
+  marker->pub.saw_SOF = FALSE;
+  marker->pub.discarded_bytes = 0;
+  marker->cur_marker = NULL;
+}
+
+
+/*
+ * Initialize the marker reader module.
+ * This is called only once, when the decompression object is created.
+ */
+
+GLOBAL(void)
+jinit_marker_reader (j_decompress_ptr cinfo)
+{
+  my_marker_ptr marker;
+  int i;
+
+  /* Create subobject in permanent pool */
+  marker = (my_marker_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+                                SIZEOF(my_marker_reader));
+  cinfo->marker = (struct jpeg_marker_reader *) marker;
+  /* Initialize public method pointers */
+  marker->pub.reset_marker_reader = reset_marker_reader;
+  marker->pub.read_markers = read_markers;
+  marker->pub.read_restart_marker = read_restart_marker;
+  /* Initialize COM/APPn processing.
+   * By default, we examine and then discard APP0 and APP14,
+   * but simply discard COM and all other APPn.
+   */
+  marker->process_COM = skip_variable;
+  marker->length_limit_COM = 0;
+  for (i = 0; i < 16; i++) {
+    marker->process_APPn[i] = skip_variable;
+    marker->length_limit_APPn[i] = 0;
+  }
+  marker->process_APPn[0] = get_interesting_appn;
+  marker->process_APPn[14] = get_interesting_appn;
+  /* Reset marker processing state */
+  reset_marker_reader(cinfo);
+}
+
+
+/*
+ * Control saving of COM and APPn markers into marker_list.
+ */
+
+#ifdef SAVE_MARKERS_SUPPORTED
+
+GLOBAL(void)
+jpeg_save_markers (j_decompress_ptr cinfo, int marker_code,
+                   unsigned int length_limit)
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+  long maxlength;
+  jpeg_marker_parser_method processor;
+
+  /* Length limit mustn't be larger than what we can allocate
+   * (should only be a concern in a 16-bit environment).
+   */
+  maxlength = cinfo->mem->max_alloc_chunk - SIZEOF(struct jpeg_marker_struct);
+  if (((long) length_limit) > maxlength)
+    length_limit = (unsigned int) maxlength;
+
+  /* Choose processor routine to use.
+   * APP0/APP14 have special requirements.
+   */
+  if (length_limit) {
+    processor = save_marker;
+    /* If saving APP0/APP14, save at least enough for our internal use. */
+    if (marker_code == (int) M_APP0 && length_limit < APP0_DATA_LEN)
+      length_limit = APP0_DATA_LEN;
+    else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN)
+      length_limit = APP14_DATA_LEN;
+  } else {
+    processor = skip_variable;
+    /* If discarding APP0/APP14, use our regular on-the-fly processor. */
+    if (marker_code == (int) M_APP0 || marker_code == (int) M_APP14)
+      processor = get_interesting_appn;
+  }
+
+  if (marker_code == (int) M_COM) {
+    marker->process_COM = processor;
+    marker->length_limit_COM = length_limit;
+  } else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) {
+    marker->process_APPn[marker_code - (int) M_APP0] = processor;
+    marker->length_limit_APPn[marker_code - (int) M_APP0] = length_limit;
+  } else
+    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
+}
+
+#endif /* SAVE_MARKERS_SUPPORTED */
+
+
+/*
+ * Install a special processing method for COM or APPn markers.
+ */
+
+GLOBAL(void)
+jpeg_set_marker_processor (j_decompress_ptr cinfo, int marker_code,
+                           jpeg_marker_parser_method routine)
+{
+  my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
+
+  if (marker_code == (int) M_COM)
+    marker->process_COM = routine;
+  else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15)
+    marker->process_APPn[marker_code - (int) M_APP0] = routine;
+  else
+    ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
+}