Imported Upstream version 1.8.3upstream/1.8.3

1 files changed, 0 insertions, 1541 deletions

diff --git a/jpeg/jdhuff.c b/jpeg/jdhuff.c
deleted file mode 100755
index 06f92fe..0000000
--- a/jpeg/jdhuff.c
+++ /dev/null
@@ -1,1541 +0,0 @@
-/*
- * jdhuff.c
- *
- * Copyright (C) 1991-1997, Thomas G. Lane.
- * Modified 2006-2009 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 Huffman entropy decoding routines.
- * Both sequential and progressive modes are supported in this single module.
- *
- * Much of the complexity here has to do with supporting input suspension.
- * If the data source module demands suspension, we want to be able to back
- * up to the start of the current MCU.  To do this, we copy state variables
- * into local working storage, and update them back to the permanent
- * storage only upon successful completion of an MCU.
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-
-
-/* Derived data constructed for each Huffman table */
-
-#define HUFF_LOOKAHEAD	8	/* # of bits of lookahead */
-
-typedef struct {
-  /* Basic tables: (element [0] of each array is unused) */
-  INT32 maxcode[18];		/* largest code of length k (-1 if none) */
-  /* (maxcode[17] is a sentinel to ensure jpeg_huff_decode terminates) */
-  INT32 valoffset[17];		/* huffval[] offset for codes of length k */
-  /* valoffset[k] = huffval[] index of 1st symbol of code length k, less
-   * the smallest code of length k; so given a code of length k, the
-   * corresponding symbol is huffval[code + valoffset[k]]
-   */
-
-  /* Link to public Huffman table (needed only in jpeg_huff_decode) */
-  JHUFF_TBL *pub;
-
-  /* Lookahead tables: indexed by the next HUFF_LOOKAHEAD bits of
-   * the input data stream.  If the next Huffman code is no more
-   * than HUFF_LOOKAHEAD bits long, we can obtain its length and
-   * the corresponding symbol directly from these tables.
-   */
-  int look_nbits[1<<HUFF_LOOKAHEAD]; /* # bits, or 0 if too long */
-  UINT8 look_sym[1<<HUFF_LOOKAHEAD]; /* symbol, or unused */
-} d_derived_tbl;
-
-
-/*
- * Fetching the next N bits from the input stream is a time-critical operation
- * for the Huffman decoders.  We implement it with a combination of inline
- * macros and out-of-line subroutines.  Note that N (the number of bits
- * demanded at one time) never exceeds 15 for JPEG use.
- *
- * We read source bytes into get_buffer and dole out bits as needed.
- * If get_buffer already contains enough bits, they are fetched in-line
- * by the macros CHECK_BIT_BUFFER and GET_BITS.  When there aren't enough
- * bits, jpeg_fill_bit_buffer is called; it will attempt to fill get_buffer
- * as full as possible (not just to the number of bits needed; this
- * prefetching reduces the overhead cost of calling jpeg_fill_bit_buffer).
- * Note that jpeg_fill_bit_buffer may return FALSE to indicate suspension.
- * On TRUE return, jpeg_fill_bit_buffer guarantees that get_buffer contains
- * at least the requested number of bits --- dummy zeroes are inserted if
- * necessary.
- */
-
-typedef INT32 bit_buf_type;	/* type of bit-extraction buffer */
-#define BIT_BUF_SIZE  32	/* size of buffer in bits */
-
-/* If long is > 32 bits on your machine, and shifting/masking longs is
- * reasonably fast, making bit_buf_type be long and setting BIT_BUF_SIZE
- * appropriately should be a win.  Unfortunately we can't define the size
- * with something like  #define BIT_BUF_SIZE (sizeof(bit_buf_type)*8)
- * because not all machines measure sizeof in 8-bit bytes.
- */
-
-typedef struct {		/* Bitreading state saved across MCUs */
-  bit_buf_type get_buffer;	/* current bit-extraction buffer */
-  int bits_left;		/* # of unused bits in it */
-} bitread_perm_state;
-
-typedef struct {		/* Bitreading working state within an MCU */
-  /* Current data source location */
-  /* We need a copy, rather than munging the original, in case of suspension */
-  const JOCTET * next_input_byte; /* => next byte to read from source */
-  size_t bytes_in_buffer;	/* # of bytes remaining in source buffer */
-  /* Bit input buffer --- note these values are kept in register variables,
-   * not in this struct, inside the inner loops.
-   */
-  bit_buf_type get_buffer;	/* current bit-extraction buffer */
-  int bits_left;		/* # of unused bits in it */
-  /* Pointer needed by jpeg_fill_bit_buffer. */
-  j_decompress_ptr cinfo;	/* back link to decompress master record */
-} bitread_working_state;
-
-/* Macros to declare and load/save bitread local variables. */
-#define BITREAD_STATE_VARS  \
-	register bit_buf_type get_buffer;  \
-	register int bits_left;  \
-	bitread_working_state br_state
-
-#define BITREAD_LOAD_STATE(cinfop,permstate)  \
-	br_state.cinfo = cinfop; \
-	br_state.next_input_byte = cinfop->src->next_input_byte; \
-	br_state.bytes_in_buffer = cinfop->src->bytes_in_buffer; \
-	get_buffer = permstate.get_buffer; \
-	bits_left = permstate.bits_left;
-
-#define BITREAD_SAVE_STATE(cinfop,permstate)  \
-	cinfop->src->next_input_byte = br_state.next_input_byte; \
-	cinfop->src->bytes_in_buffer = br_state.bytes_in_buffer; \
-	permstate.get_buffer = get_buffer; \
-	permstate.bits_left = bits_left
-
-/*
- * These macros provide the in-line portion of bit fetching.
- * Use CHECK_BIT_BUFFER to ensure there are N bits in get_buffer
- * before using GET_BITS, PEEK_BITS, or DROP_BITS.
- * The variables get_buffer and bits_left are assumed to be locals,
- * but the state struct might not be (jpeg_huff_decode needs this).
- *	CHECK_BIT_BUFFER(state,n,action);
- *		Ensure there are N bits in get_buffer; if suspend, take action.
- *      val = GET_BITS(n);
- *		Fetch next N bits.
- *      val = PEEK_BITS(n);
- *		Fetch next N bits without removing them from the buffer.
- *	DROP_BITS(n);
- *		Discard next N bits.
- * The value N should be a simple variable, not an expression, because it
- * is evaluated multiple times.
- */
-
-#define CHECK_BIT_BUFFER(state,nbits,action) \
-	{ if (bits_left < (nbits)) {  \
-	    if (! jpeg_fill_bit_buffer(&(state),get_buffer,bits_left,nbits))  \
-	      { action; }  \
-	    get_buffer = (state).get_buffer; bits_left = (state).bits_left; } }
-
-#define GET_BITS(nbits) \
-	(((int) (get_buffer >> (bits_left -= (nbits)))) & BIT_MASK(nbits))
-
-#define PEEK_BITS(nbits) \
-	(((int) (get_buffer >> (bits_left -  (nbits)))) & BIT_MASK(nbits))
-
-#define DROP_BITS(nbits) \
-	(bits_left -= (nbits))
-
-
-/*
- * Code for extracting next Huffman-coded symbol from input bit stream.
- * Again, this is time-critical and we make the main paths be macros.
- *
- * We use a lookahead table to process codes of up to HUFF_LOOKAHEAD bits
- * without looping.  Usually, more than 95% of the Huffman codes will be 8
- * or fewer bits long.  The few overlength codes are handled with a loop,
- * which need not be inline code.
- *
- * Notes about the HUFF_DECODE macro:
- * 1. Near the end of the data segment, we may fail to get enough bits
- *    for a lookahead.  In that case, we do it the hard way.
- * 2. If the lookahead table contains no entry, the next code must be
- *    more than HUFF_LOOKAHEAD bits long.
- * 3. jpeg_huff_decode returns -1 if forced to suspend.
- */
-
-#define HUFF_DECODE(result,state,htbl,failaction,slowlabel) \
-{ register int nb, look; \
-  if (bits_left < HUFF_LOOKAHEAD) { \
-    if (! jpeg_fill_bit_buffer(&state,get_buffer,bits_left, 0)) {failaction;} \
-    get_buffer = state.get_buffer; bits_left = state.bits_left; \
-    if (bits_left < HUFF_LOOKAHEAD) { \
-      nb = 1; goto slowlabel; \
-    } \
-  } \
-  look = PEEK_BITS(HUFF_LOOKAHEAD); \
-  if ((nb = htbl->look_nbits[look]) != 0) { \
-    DROP_BITS(nb); \
-    result = htbl->look_sym[look]; \
-  } else { \
-    nb = HUFF_LOOKAHEAD+1; \
-slowlabel: \
-    if ((result=jpeg_huff_decode(&state,get_buffer,bits_left,htbl,nb)) < 0) \
-	{ failaction; } \
-    get_buffer = state.get_buffer; bits_left = state.bits_left; \
-  } \
-}
-
-
-/*
- * Expanded entropy decoder object for Huffman decoding.
- *
- * The savable_state subrecord contains fields that change within an MCU,
- * but must not be updated permanently until we complete the MCU.
- */
-
-typedef struct {
-  unsigned int EOBRUN;			/* remaining EOBs in EOBRUN */
-  int last_dc_val[MAX_COMPS_IN_SCAN];	/* last DC coef for each component */
-} savable_state;
-
-/* This macro is to work around compilers with missing or broken
- * structure assignment.  You'll need to fix this code if you have
- * such a compiler and you change MAX_COMPS_IN_SCAN.
- */
-
-#ifndef NO_STRUCT_ASSIGN
-#define ASSIGN_STATE(dest,src)  ((dest) = (src))
-#else
-#if MAX_COMPS_IN_SCAN == 4
-#define ASSIGN_STATE(dest,src)  \
-	((dest).EOBRUN = (src).EOBRUN, \
-	 (dest).last_dc_val[0] = (src).last_dc_val[0], \
-	 (dest).last_dc_val[1] = (src).last_dc_val[1], \
-	 (dest).last_dc_val[2] = (src).last_dc_val[2], \
-	 (dest).last_dc_val[3] = (src).last_dc_val[3])
-#endif
-#endif
-
-
-typedef struct {
-  struct jpeg_entropy_decoder pub; /* public fields */
-
-  /* These fields are loaded into local variables at start of each MCU.
-   * In case of suspension, we exit WITHOUT updating them.
-   */
-  bitread_perm_state bitstate;	/* Bit buffer at start of MCU */
-  savable_state saved;		/* Other state at start of MCU */
-
-  /* These fields are NOT loaded into local working state. */
-  boolean insufficient_data;	/* set TRUE after emitting warning */
-  unsigned int restarts_to_go;	/* MCUs left in this restart interval */
-
-  /* Following two fields used only in progressive mode */
-
-  /* Pointers to derived tables (these workspaces have image lifespan) */
-  d_derived_tbl * derived_tbls[NUM_HUFF_TBLS];
-
-  d_derived_tbl * ac_derived_tbl; /* active table during an AC scan */
-
-  /* Following fields used only in sequential mode */
-
-  /* Pointers to derived tables (these workspaces have image lifespan) */
-  d_derived_tbl * dc_derived_tbls[NUM_HUFF_TBLS];
-  d_derived_tbl * ac_derived_tbls[NUM_HUFF_TBLS];
-
-  /* Precalculated info set up by start_pass for use in decode_mcu: */
-
-  /* Pointers to derived tables to be used for each block within an MCU */
-  d_derived_tbl * dc_cur_tbls[D_MAX_BLOCKS_IN_MCU];
-  d_derived_tbl * ac_cur_tbls[D_MAX_BLOCKS_IN_MCU];
-  /* Whether we care about the DC and AC coefficient values for each block */
-  int coef_limit[D_MAX_BLOCKS_IN_MCU];
-} huff_entropy_decoder;
-
-typedef huff_entropy_decoder * huff_entropy_ptr;
-
-
-static const int jpeg_zigzag_order[8][8] = {
-  {  0,  1,  5,  6, 14, 15, 27, 28 },
-  {  2,  4,  7, 13, 16, 26, 29, 42 },
-  {  3,  8, 12, 17, 25, 30, 41, 43 },
-  {  9, 11, 18, 24, 31, 40, 44, 53 },
-  { 10, 19, 23, 32, 39, 45, 52, 54 },
-  { 20, 22, 33, 38, 46, 51, 55, 60 },
-  { 21, 34, 37, 47, 50, 56, 59, 61 },
-  { 35, 36, 48, 49, 57, 58, 62, 63 }
-};
-
-static const int jpeg_zigzag_order7[7][7] = {
-  {  0,  1,  5,  6, 14, 15, 27 },
-  {  2,  4,  7, 13, 16, 26, 28 },
-  {  3,  8, 12, 17, 25, 29, 38 },
-  {  9, 11, 18, 24, 30, 37, 39 },
-  { 10, 19, 23, 31, 36, 40, 45 },
-  { 20, 22, 32, 35, 41, 44, 46 },
-  { 21, 33, 34, 42, 43, 47, 48 }
-};
-
-static const int jpeg_zigzag_order6[6][6] = {
-  {  0,  1,  5,  6, 14, 15 },
-  {  2,  4,  7, 13, 16, 25 },
-  {  3,  8, 12, 17, 24, 26 },
-  {  9, 11, 18, 23, 27, 32 },
-  { 10, 19, 22, 28, 31, 33 },
-  { 20, 21, 29, 30, 34, 35 }
-};
-
-static const int jpeg_zigzag_order5[5][5] = {
-  {  0,  1,  5,  6, 14 },
-  {  2,  4,  7, 13, 15 },
-  {  3,  8, 12, 16, 21 },
-  {  9, 11, 17, 20, 22 },
-  { 10, 18, 19, 23, 24 }
-};
-
-static const int jpeg_zigzag_order4[4][4] = {
-  { 0,  1,  5,  6 },
-  { 2,  4,  7, 12 },
-  { 3,  8, 11, 13 },
-  { 9, 10, 14, 15 }
-};
-
-static const int jpeg_zigzag_order3[3][3] = {
-  { 0, 1, 5 },
-  { 2, 4, 6 },
-  { 3, 7, 8 }
-};
-
-static const int jpeg_zigzag_order2[2][2] = {
-  { 0, 1 },
-  { 2, 3 }
-};
-
-
-/*
- * Compute the derived values for a Huffman table.
- * This routine also performs some validation checks on the table.
- */
-
-LOCAL(void)
-jpeg_make_d_derived_tbl (j_decompress_ptr cinfo, boolean isDC, int tblno,
-			 d_derived_tbl ** pdtbl)
-{
-  JHUFF_TBL *htbl;
-  d_derived_tbl *dtbl;
-  int p, i, l, si, numsymbols;
-  int lookbits, ctr;
-  char huffsize[257];
-  unsigned int huffcode[257];
-  unsigned int code;
-
-  /* Note that huffsize[] and huffcode[] are filled in code-length order,
-   * paralleling the order of the symbols themselves in htbl->huffval[].
-   */
-
-  /* Find the input Huffman table */
-  if (tblno < 0 || tblno >= NUM_HUFF_TBLS)
-    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno);
-  htbl =
-    isDC ? cinfo->dc_huff_tbl_ptrs[tblno] : cinfo->ac_huff_tbl_ptrs[tblno];
-  if (htbl == NULL)
-    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno);
-
-  /* Allocate a workspace if we haven't already done so. */
-  if (*pdtbl == NULL)
-    *pdtbl = (d_derived_tbl *)
-      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-				  SIZEOF(d_derived_tbl));
-  dtbl = *pdtbl;
-  dtbl->pub = htbl;		/* fill in back link */
-  
-  /* Figure C.1: make table of Huffman code length for each symbol */
-
-  p = 0;
-  for (l = 1; l <= 16; l++) {
-    i = (int) htbl->bits[l];
-    if (i < 0 || p + i > 256)	/* protect against table overrun */
-      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
-    while (i--)
-      huffsize[p++] = (char) l;
-  }
-  huffsize[p] = 0;
-  numsymbols = p;
-  
-  /* Figure C.2: generate the codes themselves */
-  /* We also validate that the counts represent a legal Huffman code tree. */
-  
-  code = 0;
-  si = huffsize[0];
-  p = 0;
-  while (huffsize[p]) {
-    while (((int) huffsize[p]) == si) {
-      huffcode[p++] = code;
-      code++;
-    }
-    /* code is now 1 more than the last code used for codelength si; but
-     * it must still fit in si bits, since no code is allowed to be all ones.
-     */
-    if (((INT32) code) >= (((INT32) 1) << si))
-      ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
-    code <<= 1;
-    si++;
-  }
-
-  /* Figure F.15: generate decoding tables for bit-sequential decoding */
-
-  p = 0;
-  for (l = 1; l <= 16; l++) {
-    if (htbl->bits[l]) {
-      /* valoffset[l] = huffval[] index of 1st symbol of code length l,
-       * minus the minimum code of length l
-       */
-      dtbl->valoffset[l] = (INT32) p - (INT32) huffcode[p];
-      p += htbl->bits[l];
-      dtbl->maxcode[l] = huffcode[p-1]; /* maximum code of length l */
-    } else {
-      dtbl->maxcode[l] = -1;	/* -1 if no codes of this length */
-    }
-  }
-  dtbl->maxcode[17] = 0xFFFFFL; /* ensures jpeg_huff_decode terminates */
-
-  /* Compute lookahead tables to speed up decoding.
-   * First we set all the table entries to 0, indicating "too long";
-   * then we iterate through the Huffman codes that are short enough and
-   * fill in all the entries that correspond to bit sequences starting
-   * with that code.
-   */
-
-  MEMZERO(dtbl->look_nbits, SIZEOF(dtbl->look_nbits));
-
-  p = 0;
-  for (l = 1; l <= HUFF_LOOKAHEAD; l++) {
-    for (i = 1; i <= (int) htbl->bits[l]; i++, p++) {
-      /* l = current code's length, p = its index in huffcode[] & huffval[]. */
-      /* Generate left-justified code followed by all possible bit sequences */
-      lookbits = huffcode[p] << (HUFF_LOOKAHEAD-l);
-      for (ctr = 1 << (HUFF_LOOKAHEAD-l); ctr > 0; ctr--) {
-	dtbl->look_nbits[lookbits] = l;
-	dtbl->look_sym[lookbits] = htbl->huffval[p];
-	lookbits++;
-      }
-    }
-  }
-
-  /* Validate symbols as being reasonable.
-   * For AC tables, we make no check, but accept all byte values 0..255.
-   * For DC tables, we require the symbols to be in range 0..15.
-   * (Tighter bounds could be applied depending on the data depth and mode,
-   * but this is sufficient to ensure safe decoding.)
-   */
-  if (isDC) {
-    for (i = 0; i < numsymbols; i++) {
-      int sym = htbl->huffval[i];
-      if (sym < 0 || sym > 15)
-	ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
-    }
-  }
-}
-
-
-/*
- * Out-of-line code for bit fetching.
- * Note: current values of get_buffer and bits_left are passed as parameters,
- * but are returned in the corresponding fields of the state struct.
- *
- * On most machines MIN_GET_BITS should be 25 to allow the full 32-bit width
- * of get_buffer to be used.  (On machines with wider words, an even larger
- * buffer could be used.)  However, on some machines 32-bit shifts are
- * quite slow and take time proportional to the number of places shifted.
- * (This is true with most PC compilers, for instance.)  In this case it may
- * be a win to set MIN_GET_BITS to the minimum value of 15.  This reduces the
- * average shift distance at the cost of more calls to jpeg_fill_bit_buffer.
- */
-
-#ifdef SLOW_SHIFT_32
-#define MIN_GET_BITS  15	/* minimum allowable value */
-#else
-#define MIN_GET_BITS  (BIT_BUF_SIZE-7)
-#endif
-
-
-LOCAL(boolean)
-jpeg_fill_bit_buffer (bitread_working_state * state,
-		      register bit_buf_type get_buffer, register int bits_left,
-		      int nbits)
-/* Load up the bit buffer to a depth of at least nbits */
-{
-  /* Copy heavily used state fields into locals (hopefully registers) */
-  register const JOCTET * next_input_byte = state->next_input_byte;
-  register size_t bytes_in_buffer = state->bytes_in_buffer;
-  j_decompress_ptr cinfo = state->cinfo;
-
-  /* Attempt to load at least MIN_GET_BITS bits into get_buffer. */
-  /* (It is assumed that no request will be for more than that many bits.) */
-  /* We fail to do so only if we hit a marker or are forced to suspend. */
-
-  if (cinfo->unread_marker == 0) {	/* cannot advance past a marker */
-    while (bits_left < MIN_GET_BITS) {
-      register int c;
-
-      /* Attempt to read a byte */
-      if (bytes_in_buffer == 0) {
-	if (! (*cinfo->src->fill_input_buffer) (cinfo))
-	  return FALSE;
-	next_input_byte = cinfo->src->next_input_byte;
-	bytes_in_buffer = cinfo->src->bytes_in_buffer;
-      }
-      bytes_in_buffer--;
-      c = GETJOCTET(*next_input_byte++);
-
-      /* If it's 0xFF, check and discard stuffed zero byte */
-      if (c == 0xFF) {
-	/* Loop here to discard any padding FF's on terminating marker,
-	 * so that we can save a valid unread_marker value.  NOTE: we will
-	 * accept multiple FF's followed by a 0 as meaning a single FF data
-	 * byte.  This data pattern is not valid according to the standard.
-	 */
-	do {
-	  if (bytes_in_buffer == 0) {
-	    if (! (*cinfo->src->fill_input_buffer) (cinfo))
-	      return FALSE;
-	    next_input_byte = cinfo->src->next_input_byte;
-	    bytes_in_buffer = cinfo->src->bytes_in_buffer;
-	  }
-	  bytes_in_buffer--;
-	  c = GETJOCTET(*next_input_byte++);
-	} while (c == 0xFF);
-
-	if (c == 0) {
-	  /* Found FF/00, which represents an FF data byte */
-	  c = 0xFF;
-	} else {
-	  /* Oops, it's actually a marker indicating end of compressed data.
-	   * Save the marker code for later use.
-	   * Fine point: it might appear that we should save the marker into
-	   * bitread working state, not straight into permanent state.  But
-	   * once we have hit a marker, we cannot need to suspend within the
-	   * current MCU, because we will read no more bytes from the data
-	   * source.  So it is OK to update permanent state right away.
-	   */
-	  cinfo->unread_marker = c;
-	  /* See if we need to insert some fake zero bits. */
-	  goto no_more_bytes;
-	}
-      }
-
-      /* OK, load c into get_buffer */
-      get_buffer = (get_buffer << 8) | c;
-      bits_left += 8;
-    } /* end while */
-  } else {
-  no_more_bytes:
-    /* We get here if we've read the marker that terminates the compressed
-     * data segment.  There should be enough bits in the buffer register
-     * to satisfy the request; if so, no problem.
-     */
-    if (nbits > bits_left) {
-      /* Uh-oh.  Report corrupted data to user and stuff zeroes into
-       * the data stream, so that we can produce some kind of image.
-       * We use a nonvolatile flag to ensure that only one warning message
-       * appears per data segment.
-       */
-      if (! ((huff_entropy_ptr) cinfo->entropy)->insufficient_data) {
-	WARNMS(cinfo, JWRN_HIT_MARKER);
-	((huff_entropy_ptr) cinfo->entropy)->insufficient_data = TRUE;
-      }
-      /* Fill the buffer with zero bits */
-      get_buffer <<= MIN_GET_BITS - bits_left;
-      bits_left = MIN_GET_BITS;
-    }
-  }
-
-  /* Unload the local registers */
-  state->next_input_byte = next_input_byte;
-  state->bytes_in_buffer = bytes_in_buffer;
-  state->get_buffer = get_buffer;
-  state->bits_left = bits_left;
-
-  return TRUE;
-}
-
-
-/*
- * Figure F.12: extend sign bit.
- * On some machines, a shift and sub will be faster than a table lookup.
- */
-
-#ifdef AVOID_TABLES
-
-#define BIT_MASK(nbits)   ((1<<(nbits))-1)
-#define HUFF_EXTEND(x,s)  ((x) < (1<<((s)-1)) ? (x) - ((1<<(s))-1) : (x))
-
-#else
-
-#define BIT_MASK(nbits)   bmask[nbits]
-#define HUFF_EXTEND(x,s)  ((x) <= bmask[(s) - 1] ? (x) - bmask[s] : (x))
-
-static const int bmask[16] =	/* bmask[n] is mask for n rightmost bits */
-  { 0, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF,
-    0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF };
-
-#endif /* AVOID_TABLES */
-
-
-/*
- * Out-of-line code for Huffman code decoding.
- */
-
-LOCAL(int)
-jpeg_huff_decode (bitread_working_state * state,
-		  register bit_buf_type get_buffer, register int bits_left,
-		  d_derived_tbl * htbl, int min_bits)
-{
-  register int l = min_bits;
-  register INT32 code;
-
-  /* HUFF_DECODE has determined that the code is at least min_bits */
-  /* bits long, so fetch that many bits in one swoop. */
-
-  CHECK_BIT_BUFFER(*state, l, return -1);
-  code = GET_BITS(l);
-
-  /* Collect the rest of the Huffman code one bit at a time. */
-  /* This is per Figure F.16 in the JPEG spec. */
-
-  while (code > htbl->maxcode[l]) {
-    code <<= 1;
-    CHECK_BIT_BUFFER(*state, 1, return -1);
-    code |= GET_BITS(1);
-    l++;
-  }
-
-  /* Unload the local registers */
-  state->get_buffer = get_buffer;
-  state->bits_left = bits_left;
-
-  /* With garbage input we may reach the sentinel value l = 17. */
-
-  if (l > 16) {
-    WARNMS(state->cinfo, JWRN_HUFF_BAD_CODE);
-    return 0;			/* fake a zero as the safest result */
-  }
-
-  return htbl->pub->huffval[ (int) (code + htbl->valoffset[l]) ];
-}
-
-
-/*
- * Check for a restart marker & resynchronize decoder.
- * Returns FALSE if must suspend.
- */
-
-LOCAL(boolean)
-process_restart (j_decompress_ptr cinfo)
-{
-  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
-  int ci;
-
-  /* Throw away any unused bits remaining in bit buffer; */
-  /* include any full bytes in next_marker's count of discarded bytes */
-  cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
-  entropy->bitstate.bits_left = 0;
-
-  /* Advance past the RSTn marker */
-  if (! (*cinfo->marker->read_restart_marker) (cinfo))
-    return FALSE;
-
-  /* Re-initialize DC predictions to 0 */
-  for (ci = 0; ci < cinfo->comps_in_scan; ci++)
-    entropy->saved.last_dc_val[ci] = 0;
-  /* Re-init EOB run count, too */
-  entropy->saved.EOBRUN = 0;
-
-  /* Reset restart counter */
-  entropy->restarts_to_go = cinfo->restart_interval;
-
-  /* Reset out-of-data flag, unless read_restart_marker left us smack up
-   * against a marker.  In that case we will end up treating the next data
-   * segment as empty, and we can avoid producing bogus output pixels by
-   * leaving the flag set.
-   */
-  if (cinfo->unread_marker == 0)
-    entropy->insufficient_data = FALSE;
-
-  return TRUE;
-}
-
-
-/*
- * Huffman MCU decoding.
- * Each of these routines decodes and returns one MCU's worth of
- * Huffman-compressed coefficients. 
- * The coefficients are reordered from zigzag order into natural array order,
- * but are not dequantized.
- *
- * The i'th block of the MCU is stored into the block pointed to by
- * MCU_data[i].  WE ASSUME THIS AREA IS INITIALLY ZEROED BY THE CALLER.
- * (Wholesale zeroing is usually a little faster than retail...)
- *
- * We return FALSE if data source requested suspension.  In that case no
- * changes have been made to permanent state.  (Exception: some output
- * coefficients may already have been assigned.  This is harmless for
- * spectral selection, since we'll just re-assign them on the next call.
- * Successive approximation AC refinement has to be more careful, however.)
- */
-
-/*
- * MCU decoding for DC initial scan (either spectral selection,
- * or first pass of successive approximation).
- */
-
-METHODDEF(boolean)
-decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
-{   
-  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
-  int Al = cinfo->Al;
-  register int s, r;
-  int blkn, ci;
-  JBLOCKROW block;
-  BITREAD_STATE_VARS;
-  savable_state state;
-  d_derived_tbl * tbl;
-  jpeg_component_info * compptr;
-
-  /* Process restart marker if needed; may have to suspend */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0)
-      if (! process_restart(cinfo))
-	return FALSE;
-  }
-
-  /* If we've run out of data, just leave the MCU set to zeroes.
-   * This way, we return uniform gray for the remainder of the segment.
-   */
-  if (! entropy->insufficient_data) {
-
-    /* Load up working state */
-    BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
-    ASSIGN_STATE(state, entropy->saved);
-
-    /* Outer loop handles each block in the MCU */
-
-    for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
-      block = MCU_data[blkn];
-      ci = cinfo->MCU_membership[blkn];
-      compptr = cinfo->cur_comp_info[ci];
-      tbl = entropy->derived_tbls[compptr->dc_tbl_no];
-
-      /* Decode a single block's worth of coefficients */
-
-      /* Section F.2.2.1: decode the DC coefficient difference */
-      HUFF_DECODE(s, br_state, tbl, return FALSE, label1);
-      if (s) {
-	CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	r = GET_BITS(s);
-	s = HUFF_EXTEND(r, s);
-      }
-
-      /* Convert DC difference to actual value, update last_dc_val */
-      s += state.last_dc_val[ci];
-      state.last_dc_val[ci] = s;
-      /* Scale and output the coefficient (assumes jpeg_natural_order[0]=0) */
-      (*block)[0] = (JCOEF) (s << Al);
-    }
-
-    /* Completed MCU, so update state */
-    BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
-    ASSIGN_STATE(entropy->saved, state);
-  }
-
-  /* Account for restart interval (no-op if not using restarts) */
-  entropy->restarts_to_go--;
-
-  return TRUE;
-}
-
-
-/*
- * MCU decoding for AC initial scan (either spectral selection,
- * or first pass of successive approximation).
- */
-
-METHODDEF(boolean)
-decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
-{   
-  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
-  register int s, k, r;
-  unsigned int EOBRUN;
-  int Se, Al;
-  const int * natural_order;
-  JBLOCKROW block;
-  BITREAD_STATE_VARS;
-  d_derived_tbl * tbl;
-
-  /* Process restart marker if needed; may have to suspend */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0)
-      if (! process_restart(cinfo))
-	return FALSE;
-  }
-
-  /* If we've run out of data, just leave the MCU set to zeroes.
-   * This way, we return uniform gray for the remainder of the segment.
-   */
-  if (! entropy->insufficient_data) {
-
-    Se = cinfo->Se;
-    Al = cinfo->Al;
-    natural_order = cinfo->natural_order;
-
-    /* Load up working state.
-     * We can avoid loading/saving bitread state if in an EOB run.
-     */
-    EOBRUN = entropy->saved.EOBRUN;	/* only part of saved state we need */
-
-    /* There is always only one block per MCU */
-
-    if (EOBRUN > 0)		/* if it's a band of zeroes... */
-      EOBRUN--;			/* ...process it now (we do nothing) */
-    else {
-      BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
-      block = MCU_data[0];
-      tbl = entropy->ac_derived_tbl;
-
-      for (k = cinfo->Ss; k <= Se; k++) {
-	HUFF_DECODE(s, br_state, tbl, return FALSE, label2);
-	r = s >> 4;
-	s &= 15;
-	if (s) {
-	  k += r;
-	  CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	  r = GET_BITS(s);
-	  s = HUFF_EXTEND(r, s);
-	  /* Scale and output coefficient in natural (dezigzagged) order */
-	  (*block)[natural_order[k]] = (JCOEF) (s << Al);
-	} else {
-	  if (r == 15) {	/* ZRL */
-	    k += 15;		/* skip 15 zeroes in band */
-	  } else {		/* EOBr, run length is 2^r + appended bits */
-	    EOBRUN = 1 << r;
-	    if (r) {		/* EOBr, r > 0 */
-	      CHECK_BIT_BUFFER(br_state, r, return FALSE);
-	      r = GET_BITS(r);
-	      EOBRUN += r;
-	    }
-	    EOBRUN--;		/* this band is processed at this moment */
-	    break;		/* force end-of-band */
-	  }
-	}
-      }
-
-      BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
-    }
-
-    /* Completed MCU, so update state */
-    entropy->saved.EOBRUN = EOBRUN;	/* only part of saved state we need */
-  }
-
-  /* Account for restart interval (no-op if not using restarts) */
-  entropy->restarts_to_go--;
-
-  return TRUE;
-}
-
-
-/*
- * MCU decoding for DC successive approximation refinement scan.
- * Note: we assume such scans can be multi-component, although the spec
- * is not very clear on the point.
- */
-
-METHODDEF(boolean)
-decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
-{   
-  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
-  int p1 = 1 << cinfo->Al;	/* 1 in the bit position being coded */
-  int blkn;
-  JBLOCKROW block;
-  BITREAD_STATE_VARS;
-
-  /* Process restart marker if needed; may have to suspend */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0)
-      if (! process_restart(cinfo))
-	return FALSE;
-  }
-
-  /* Not worth the cycles to check insufficient_data here,
-   * since we will not change the data anyway if we read zeroes.
-   */
-
-  /* Load up working state */
-  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
-
-  /* Outer loop handles each block in the MCU */
-
-  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
-    block = MCU_data[blkn];
-
-    /* Encoded data is simply the next bit of the two's-complement DC value */
-    CHECK_BIT_BUFFER(br_state, 1, return FALSE);
-    if (GET_BITS(1))
-      (*block)[0] |= p1;
-    /* Note: since we use |=, repeating the assignment later is safe */
-  }
-
-  /* Completed MCU, so update state */
-  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
-
-  /* Account for restart interval (no-op if not using restarts) */
-  entropy->restarts_to_go--;
-
-  return TRUE;
-}
-
-
-/*
- * MCU decoding for AC successive approximation refinement scan.
- */
-
-METHODDEF(boolean)
-decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
-{   
-  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
-  register int s, k, r;
-  unsigned int EOBRUN;
-  int Se, p1, m1;
-  const int * natural_order;
-  JBLOCKROW block;
-  JCOEFPTR thiscoef;
-  BITREAD_STATE_VARS;
-  d_derived_tbl * tbl;
-  int num_newnz;
-  int newnz_pos[DCTSIZE2];
-
-  /* Process restart marker if needed; may have to suspend */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0)
-      if (! process_restart(cinfo))
-	return FALSE;
-  }
-
-  /* If we've run out of data, don't modify the MCU.
-   */
-  if (! entropy->insufficient_data) {
-
-    Se = cinfo->Se;
-    p1 = 1 << cinfo->Al;	/* 1 in the bit position being coded */
-    m1 = (-1) << cinfo->Al;	/* -1 in the bit position being coded */
-    natural_order = cinfo->natural_order;
-
-    /* Load up working state */
-    BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
-    EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we need */
-
-    /* There is always only one block per MCU */
-    block = MCU_data[0];
-    tbl = entropy->ac_derived_tbl;
-
-    /* If we are forced to suspend, we must undo the assignments to any newly
-     * nonzero coefficients in the block, because otherwise we'd get confused
-     * next time about which coefficients were already nonzero.
-     * But we need not undo addition of bits to already-nonzero coefficients;
-     * instead, we can test the current bit to see if we already did it.
-     */
-    num_newnz = 0;
-
-    /* initialize coefficient loop counter to start of band */
-    k = cinfo->Ss;
-
-    if (EOBRUN == 0) {
-      for (; k <= Se; k++) {
-	HUFF_DECODE(s, br_state, tbl, goto undoit, label3);
-	r = s >> 4;
-	s &= 15;
-	if (s) {
-	  if (s != 1)		/* size of new coef should always be 1 */
-	    WARNMS(cinfo, JWRN_HUFF_BAD_CODE);
-	  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
-	  if (GET_BITS(1))
-	    s = p1;		/* newly nonzero coef is positive */
-	  else
-	    s = m1;		/* newly nonzero coef is negative */
-	} else {
-	  if (r != 15) {
-	    EOBRUN = 1 << r;	/* EOBr, run length is 2^r + appended bits */
-	    if (r) {
-	      CHECK_BIT_BUFFER(br_state, r, goto undoit);
-	      r = GET_BITS(r);
-	      EOBRUN += r;
-	    }
-	    break;		/* rest of block is handled by EOB logic */
-	  }
-	  /* note s = 0 for processing ZRL */
-	}
-	/* Advance over already-nonzero coefs and r still-zero coefs,
-	 * appending correction bits to the nonzeroes.  A correction bit is 1
-	 * if the absolute value of the coefficient must be increased.
-	 */
-	do {
-	  thiscoef = *block + natural_order[k];
-	  if (*thiscoef != 0) {
-	    CHECK_BIT_BUFFER(br_state, 1, goto undoit);
-	    if (GET_BITS(1)) {
-	      if ((*thiscoef & p1) == 0) { /* do nothing if already set it */
-		if (*thiscoef >= 0)
-		  *thiscoef += p1;
-		else
-		  *thiscoef += m1;
-	      }
-	    }
-	  } else {
-	    if (--r < 0)
-	      break;		/* reached target zero coefficient */
-	  }
-	  k++;
-	} while (k <= Se);
-	if (s) {
-	  int pos = natural_order[k];
-	  /* Output newly nonzero coefficient */
-	  (*block)[pos] = (JCOEF) s;
-	  /* Remember its position in case we have to suspend */
-	  newnz_pos[num_newnz++] = pos;
-	}
-      }
-    }
-
-    if (EOBRUN > 0) {
-      /* Scan any remaining coefficient positions after the end-of-band
-       * (the last newly nonzero coefficient, if any).  Append a correction
-       * bit to each already-nonzero coefficient.  A correction bit is 1
-       * if the absolute value of the coefficient must be increased.
-       */
-      for (; k <= Se; k++) {
-	thiscoef = *block + natural_order[k];
-	if (*thiscoef != 0) {
-	  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
-	  if (GET_BITS(1)) {
-	    if ((*thiscoef & p1) == 0) { /* do nothing if already changed it */
-	      if (*thiscoef >= 0)
-		*thiscoef += p1;
-	      else
-		*thiscoef += m1;
-	    }
-	  }
-	}
-      }
-      /* Count one block completed in EOB run */
-      EOBRUN--;
-    }
-
-    /* Completed MCU, so update state */
-    BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
-    entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we need */
-  }
-
-  /* Account for restart interval (no-op if not using restarts) */
-  entropy->restarts_to_go--;
-
-  return TRUE;
-
-undoit:
-  /* Re-zero any output coefficients that we made newly nonzero */
-  while (num_newnz > 0)
-    (*block)[newnz_pos[--num_newnz]] = 0;
-
-  return FALSE;
-}
-
-
-/*
- * Decode one MCU's worth of Huffman-compressed coefficients,
- * partial blocks.
- */
-
-METHODDEF(boolean)
-decode_mcu_sub (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
-{
-  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
-  const int * natural_order;
-  int Se, blkn;
-  BITREAD_STATE_VARS;
-  savable_state state;
-
-  /* Process restart marker if needed; may have to suspend */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0)
-      if (! process_restart(cinfo))
-	return FALSE;
-  }
-
-  /* If we've run out of data, just leave the MCU set to zeroes.
-   * This way, we return uniform gray for the remainder of the segment.
-   */
-  if (! entropy->insufficient_data) {
-
-    natural_order = cinfo->natural_order;
-    Se = cinfo->lim_Se;
-
-    /* Load up working state */
-    BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
-    ASSIGN_STATE(state, entropy->saved);
-
-    /* Outer loop handles each block in the MCU */
-
-    for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
-      JBLOCKROW block = MCU_data[blkn];
-      d_derived_tbl * htbl;
-      register int s, k, r;
-      int coef_limit, ci;
-
-      /* Decode a single block's worth of coefficients */
-
-      /* Section F.2.2.1: decode the DC coefficient difference */
-      htbl = entropy->dc_cur_tbls[blkn];
-      HUFF_DECODE(s, br_state, htbl, return FALSE, label1);
-
-      htbl = entropy->ac_cur_tbls[blkn];
-      k = 1;
-      coef_limit = entropy->coef_limit[blkn];
-      if (coef_limit) {
-	/* Convert DC difference to actual value, update last_dc_val */
-	if (s) {
-	  CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	  r = GET_BITS(s);
-	  s = HUFF_EXTEND(r, s);
-	}
-	ci = cinfo->MCU_membership[blkn];
-	s += state.last_dc_val[ci];
-	state.last_dc_val[ci] = s;
-	/* Output the DC coefficient */
-	(*block)[0] = (JCOEF) s;
-
-	/* Section F.2.2.2: decode the AC coefficients */
-	/* Since zeroes are skipped, output area must be cleared beforehand */
-	for (; k < coef_limit; k++) {
-	  HUFF_DECODE(s, br_state, htbl, return FALSE, label2);
-
-	  r = s >> 4;
-	  s &= 15;
-
-	  if (s) {
-	    k += r;
-	    CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	    r = GET_BITS(s);
-	    s = HUFF_EXTEND(r, s);
-	    /* Output coefficient in natural (dezigzagged) order.
-	     * Note: the extra entries in natural_order[] will save us
-	     * if k > Se, which could happen if the data is corrupted.
-	     */
-	    (*block)[natural_order[k]] = (JCOEF) s;
-	  } else {
-	    if (r != 15)
-	      goto EndOfBlock;
-	    k += 15;
-	  }
-	}
-      } else {
-	if (s) {
-	  CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	  DROP_BITS(s);
-	}
-      }
-
-      /* Section F.2.2.2: decode the AC coefficients */
-      /* In this path we just discard the values */
-      for (; k <= Se; k++) {
-	HUFF_DECODE(s, br_state, htbl, return FALSE, label3);
-
-	r = s >> 4;
-	s &= 15;
-
-	if (s) {
-	  k += r;
-	  CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	  DROP_BITS(s);
-	} else {
-	  if (r != 15)
-	    break;
-	  k += 15;
-	}
-      }
-
-      EndOfBlock: ;
-    }
-
-    /* Completed MCU, so update state */
-    BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
-    ASSIGN_STATE(entropy->saved, state);
-  }
-
-  /* Account for restart interval (no-op if not using restarts) */
-  entropy->restarts_to_go--;
-
-  return TRUE;
-}
-
-
-/*
- * Decode one MCU's worth of Huffman-compressed coefficients,
- * full-size blocks.
- */
-
-METHODDEF(boolean)
-decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
-{
-  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
-  int blkn;
-  BITREAD_STATE_VARS;
-  savable_state state;
-
-  /* Process restart marker if needed; may have to suspend */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0)
-      if (! process_restart(cinfo))
-	return FALSE;
-  }
-
-  /* If we've run out of data, just leave the MCU set to zeroes.
-   * This way, we return uniform gray for the remainder of the segment.
-   */
-  if (! entropy->insufficient_data) {
-
-    /* Load up working state */
-    BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
-    ASSIGN_STATE(state, entropy->saved);
-
-    /* Outer loop handles each block in the MCU */
-
-    for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
-      JBLOCKROW block = MCU_data[blkn];
-      d_derived_tbl * htbl;
-      register int s, k, r;
-      int coef_limit, ci;
-
-      /* Decode a single block's worth of coefficients */
-
-      /* Section F.2.2.1: decode the DC coefficient difference */
-      htbl = entropy->dc_cur_tbls[blkn];
-      HUFF_DECODE(s, br_state, htbl, return FALSE, label1);
-
-      htbl = entropy->ac_cur_tbls[blkn];
-      k = 1;
-      coef_limit = entropy->coef_limit[blkn];
-      if (coef_limit) {
-	/* Convert DC difference to actual value, update last_dc_val */
-	if (s) {
-	  CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	  r = GET_BITS(s);
-	  s = HUFF_EXTEND(r, s);
-	}
-	ci = cinfo->MCU_membership[blkn];
-	s += state.last_dc_val[ci];
-	state.last_dc_val[ci] = s;
-	/* Output the DC coefficient */
-	(*block)[0] = (JCOEF) s;
-
-	/* Section F.2.2.2: decode the AC coefficients */
-	/* Since zeroes are skipped, output area must be cleared beforehand */
-	for (; k < coef_limit; k++) {
-	  HUFF_DECODE(s, br_state, htbl, return FALSE, label2);
-
-	  r = s >> 4;
-	  s &= 15;
-
-	  if (s) {
-	    k += r;
-	    CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	    r = GET_BITS(s);
-	    s = HUFF_EXTEND(r, s);
-	    /* Output coefficient in natural (dezigzagged) order.
-	     * Note: the extra entries in jpeg_natural_order[] will save us
-	     * if k >= DCTSIZE2, which could happen if the data is corrupted.
-	     */
-	    (*block)[jpeg_natural_order[k]] = (JCOEF) s;
-	  } else {
-	    if (r != 15)
-	      goto EndOfBlock;
-	    k += 15;
-	  }
-	}
-      } else {
-	if (s) {
-	  CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	  DROP_BITS(s);
-	}
-      }
-
-      /* Section F.2.2.2: decode the AC coefficients */
-      /* In this path we just discard the values */
-      for (; k < DCTSIZE2; k++) {
-	HUFF_DECODE(s, br_state, htbl, return FALSE, label3);
-
-	r = s >> 4;
-	s &= 15;
-
-	if (s) {
-	  k += r;
-	  CHECK_BIT_BUFFER(br_state, s, return FALSE);
-	  DROP_BITS(s);
-	} else {
-	  if (r != 15)
-	    break;
-	  k += 15;
-	}
-      }
-
-      EndOfBlock: ;
-    }
-
-    /* Completed MCU, so update state */
-    BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
-    ASSIGN_STATE(entropy->saved, state);
-  }
-
-  /* Account for restart interval (no-op if not using restarts) */
-  entropy->restarts_to_go--;
-
-  return TRUE;
-}
-
-
-/*
- * Initialize for a Huffman-compressed scan.
- */
-
-METHODDEF(void)
-start_pass_huff_decoder (j_decompress_ptr cinfo)
-{
-  huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
-  int ci, blkn, tbl, i;
-  jpeg_component_info * compptr;
-
-  if (cinfo->progressive_mode) {
-    /* Validate progressive scan parameters */
-    if (cinfo->Ss == 0) {
-      if (cinfo->Se != 0)
-	goto bad;
-    } else {
-      /* need not check Ss/Se < 0 since they came from unsigned bytes */
-      if (cinfo->Se < cinfo->Ss || cinfo->Se > cinfo->lim_Se)
-	goto bad;
-      /* AC scans may have only one component */
-      if (cinfo->comps_in_scan != 1)
-	goto bad;
-    }
-    if (cinfo->Ah != 0) {
-      /* Successive approximation refinement scan: must have Al = Ah-1. */
-      if (cinfo->Ah-1 != cinfo->Al)
-	goto bad;
-    }
-    if (cinfo->Al > 13) {	/* need not check for < 0 */
-      /* Arguably the maximum Al value should be less than 13 for 8-bit precision,
-       * but the spec doesn't say so, and we try to be liberal about what we
-       * accept.  Note: large Al values could result in out-of-range DC
-       * coefficients during early scans, leading to bizarre displays due to
-       * overflows in the IDCT math.  But we won't crash.
-       */
-      bad:
-      ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
-	       cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
-    }
-    /* Update progression status, and verify that scan order is legal.
-     * Note that inter-scan inconsistencies are treated as warnings
-     * not fatal errors ... not clear if this is right way to behave.
-     */
-    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
-      int coefi, cindex = cinfo->cur_comp_info[ci]->component_index;
-      int *coef_bit_ptr = & cinfo->coef_bits[cindex][0];
-      if (cinfo->Ss && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
-	WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
-      for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
-	int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
-	if (cinfo->Ah != expected)
-	  WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
-	coef_bit_ptr[coefi] = cinfo->Al;
-      }
-    }
-
-    /* Select MCU decoding routine */
-    if (cinfo->Ah == 0) {
-      if (cinfo->Ss == 0)
-	entropy->pub.decode_mcu = decode_mcu_DC_first;
-      else
-	entropy->pub.decode_mcu = decode_mcu_AC_first;
-    } else {
-      if (cinfo->Ss == 0)
-	entropy->pub.decode_mcu = decode_mcu_DC_refine;
-      else
-	entropy->pub.decode_mcu = decode_mcu_AC_refine;
-    }
-
-    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
-      compptr = cinfo->cur_comp_info[ci];
-      /* Make sure requested tables are present, and compute derived tables.
-       * We may build same derived table more than once, but it's not expensive.
-       */
-      if (cinfo->Ss == 0) {
-	if (cinfo->Ah == 0) {	/* DC refinement needs no table */
-	  tbl = compptr->dc_tbl_no;
-	  jpeg_make_d_derived_tbl(cinfo, TRUE, tbl,
-				  & entropy->derived_tbls[tbl]);
-	}
-      } else {
-	tbl = compptr->ac_tbl_no;
-	jpeg_make_d_derived_tbl(cinfo, FALSE, tbl,
-				& entropy->derived_tbls[tbl]);
-	/* remember the single active table */
-	entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
-      }
-      /* Initialize DC predictions to 0 */
-      entropy->saved.last_dc_val[ci] = 0;
-    }
-
-    /* Initialize private state variables */
-    entropy->saved.EOBRUN = 0;
-  } else {
-    /* Check that the scan parameters Ss, Se, Ah/Al are OK for sequential JPEG.
-     * This ought to be an error condition, but we make it a warning because
-     * there are some baseline files out there with all zeroes in these bytes.
-     */
-    if (cinfo->Ss != 0 || cinfo->Ah != 0 || cinfo->Al != 0 ||
-	((cinfo->is_baseline || cinfo->Se < DCTSIZE2) &&
-	cinfo->Se != cinfo->lim_Se))
-      WARNMS(cinfo, JWRN_NOT_SEQUENTIAL);
-
-    /* Select MCU decoding routine */
-    /* We retain the hard-coded case for full-size blocks.
-     * This is not necessary, but it appears that this version is slightly
-     * more performant in the given implementation.
-     * With an improved implementation we would prefer a single optimized
-     * function.
-     */
-    if (cinfo->lim_Se != DCTSIZE2-1)
-      entropy->pub.decode_mcu = decode_mcu_sub;
-    else
-      entropy->pub.decode_mcu = decode_mcu;
-
-    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
-      compptr = cinfo->cur_comp_info[ci];
-      /* Compute derived values for Huffman tables */
-      /* We may do this more than once for a table, but it's not expensive */
-      tbl = compptr->dc_tbl_no;
-      jpeg_make_d_derived_tbl(cinfo, TRUE, tbl,
-			      & entropy->dc_derived_tbls[tbl]);
-      if (cinfo->lim_Se) {	/* AC needs no table when not present */
-	tbl = compptr->ac_tbl_no;
-	jpeg_make_d_derived_tbl(cinfo, FALSE, tbl,
-				& entropy->ac_derived_tbls[tbl]);
-      }
-      /* Initialize DC predictions to 0 */
-      entropy->saved.last_dc_val[ci] = 0;
-    }
-
-    /* Precalculate decoding info for each block in an MCU of this scan */
-    for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
-      ci = cinfo->MCU_membership[blkn];
-      compptr = cinfo->cur_comp_info[ci];
-      /* Precalculate which table to use for each block */
-      entropy->dc_cur_tbls[blkn] = entropy->dc_derived_tbls[compptr->dc_tbl_no];
-      entropy->ac_cur_tbls[blkn] = entropy->ac_derived_tbls[compptr->ac_tbl_no];
-      /* Decide whether we really care about the coefficient values */
-      if (compptr->component_needed) {
-	ci = compptr->DCT_v_scaled_size;
-	i = compptr->DCT_h_scaled_size;
-	switch (cinfo->lim_Se) {
-	case (1*1-1):
-	  entropy->coef_limit[blkn] = 1;
-	  break;
-	case (2*2-1):
-	  if (ci <= 0 || ci > 2) ci = 2;
-	  if (i <= 0 || i > 2) i = 2;
-	  entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order2[ci - 1][i - 1];
-	  break;
-	case (3*3-1):
-	  if (ci <= 0 || ci > 3) ci = 3;
-	  if (i <= 0 || i > 3) i = 3;
-	  entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order3[ci - 1][i - 1];
-	  break;
-	case (4*4-1):
-	  if (ci <= 0 || ci > 4) ci = 4;
-	  if (i <= 0 || i > 4) i = 4;
-	  entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order4[ci - 1][i - 1];
-	  break;
-	case (5*5-1):
-	  if (ci <= 0 || ci > 5) ci = 5;
-	  if (i <= 0 || i > 5) i = 5;
-	  entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order5[ci - 1][i - 1];
-	  break;
-	case (6*6-1):
-	  if (ci <= 0 || ci > 6) ci = 6;
-	  if (i <= 0 || i > 6) i = 6;
-	  entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order6[ci - 1][i - 1];
-	  break;
-	case (7*7-1):
-	  if (ci <= 0 || ci > 7) ci = 7;
-	  if (i <= 0 || i > 7) i = 7;
-	  entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order7[ci - 1][i - 1];
-	  break;
-	default:
-	  if (ci <= 0 || ci > 8) ci = 8;
-	  if (i <= 0 || i > 8) i = 8;
-	  entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order[ci - 1][i - 1];
-	  break;
-	}
-      } else {
-	entropy->coef_limit[blkn] = 0;
-      }
-    }
-  }
-
-  /* Initialize bitread state variables */
-  entropy->bitstate.bits_left = 0;
-  entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
-  entropy->insufficient_data = FALSE;
-
-  /* Initialize restart counter */
-  entropy->restarts_to_go = cinfo->restart_interval;
-}
-
-
-/*
- * Module initialization routine for Huffman entropy decoding.
- */
-
-GLOBAL(void)
-jinit_huff_decoder (j_decompress_ptr cinfo)
-{
-  huff_entropy_ptr entropy;
-  int i;
-
-  entropy = (huff_entropy_ptr)
-    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-				SIZEOF(huff_entropy_decoder));
-  cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
-  entropy->pub.start_pass = start_pass_huff_decoder;
-
-  if (cinfo->progressive_mode) {
-    /* Create progression status table */
-    int *coef_bit_ptr, ci;
-    cinfo->coef_bits = (int (*)[DCTSIZE2])
-      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-				  cinfo->num_components*DCTSIZE2*SIZEOF(int));
-    coef_bit_ptr = & cinfo->coef_bits[0][0];
-    for (ci = 0; ci < cinfo->num_components; ci++)
-      for (i = 0; i < DCTSIZE2; i++)
-	*coef_bit_ptr++ = -1;
-
-    /* Mark derived tables unallocated */
-    for (i = 0; i < NUM_HUFF_TBLS; i++) {
-      entropy->derived_tbls[i] = NULL;
-    }
-  } else {
-    /* Mark tables unallocated */
-    for (i = 0; i < NUM_HUFF_TBLS; i++) {
-      entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;
-    }
-  }
-}