Imported Upstream version 1.7.0upstream/1.7.0

1 files changed, 0 insertions, 937 deletions

diff --git a/jpg/jcarith.c b/jpg/jcarith.c
deleted file mode 100644
index 033f670..0000000
--- a/jpg/jcarith.c
+++ /dev/null
@@ -1,937 +0,0 @@
-/*
- * jcarith.c
- *
- * Developed 1997-2011 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 portable arithmetic entropy encoding routines for JPEG
- * (implementing the ISO/IEC IS 10918-1 and CCITT Recommendation ITU-T T.81).
- *
- * Both sequential and progressive modes are supported in this single module.
- *
- * Suspension is not currently supported in this module.
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-
-
-/* Expanded entropy encoder object for arithmetic encoding. */
-
-typedef struct {
-  struct jpeg_entropy_encoder pub; /* public fields */
-
-  INT32 c; /* C register, base of coding interval, layout as in sec. D.1.3 */
-  INT32 a;               /* A register, normalized size of coding interval */
-  INT32 sc;        /* counter for stacked 0xFF values which might overflow */
-  INT32 zc;          /* counter for pending 0x00 output values which might *
-                          * be discarded at the end ("Pacman" termination) */
-  int ct;  /* bit shift counter, determines when next byte will be written */
-  int buffer;                /* buffer for most recent output byte != 0xFF */
-
-  int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
-  int dc_context[MAX_COMPS_IN_SCAN]; /* context index for DC conditioning */
-
-  unsigned int restarts_to_go;	/* MCUs left in this restart interval */
-  int next_restart_num;		/* next restart number to write (0-7) */
-
-  /* Pointers to statistics areas (these workspaces have image lifespan) */
-  unsigned char * dc_stats[NUM_ARITH_TBLS];
-  unsigned char * ac_stats[NUM_ARITH_TBLS];
-
-  /* Statistics bin for coding with fixed probability 0.5 */
-  unsigned char fixed_bin[4];
-} arith_entropy_encoder;
-
-typedef arith_entropy_encoder * arith_entropy_ptr;
-
-/* The following two definitions specify the allocation chunk size
- * for the statistics area.
- * According to sections F.1.4.4.1.3 and F.1.4.4.2, we need at least
- * 49 statistics bins for DC, and 245 statistics bins for AC coding.
- *
- * We use a compact representation with 1 byte per statistics bin,
- * thus the numbers directly represent byte sizes.
- * This 1 byte per statistics bin contains the meaning of the MPS
- * (more probable symbol) in the highest bit (mask 0x80), and the
- * index into the probability estimation state machine table
- * in the lower bits (mask 0x7F).
- */
-
-#define DC_STAT_BINS 64
-#define AC_STAT_BINS 256
-
-/* NOTE: Uncomment the following #define if you want to use the
- * given formula for calculating the AC conditioning parameter Kx
- * for spectral selection progressive coding in section G.1.3.2
- * of the spec (Kx = Kmin + SRL (8 + Se - Kmin) 4).
- * Although the spec and P&M authors claim that this "has proven
- * to give good results for 8 bit precision samples", I'm not
- * convinced yet that this is really beneficial.
- * Early tests gave only very marginal compression enhancements
- * (a few - around 5 or so - bytes even for very large files),
- * which would turn out rather negative if we'd suppress the
- * DAC (Define Arithmetic Conditioning) marker segments for
- * the default parameters in the future.
- * Note that currently the marker writing module emits 12-byte
- * DAC segments for a full-component scan in a color image.
- * This is not worth worrying about IMHO. However, since the
- * spec defines the default values to be used if the tables
- * are omitted (unlike Huffman tables, which are required
- * anyway), one might optimize this behaviour in the future,
- * and then it would be disadvantageous to use custom tables if
- * they don't provide sufficient gain to exceed the DAC size.
- *
- * On the other hand, I'd consider it as a reasonable result
- * that the conditioning has no significant influence on the
- * compression performance. This means that the basic
- * statistical model is already rather stable.
- *
- * Thus, at the moment, we use the default conditioning values
- * anyway, and do not use the custom formula.
- *
-#define CALCULATE_SPECTRAL_CONDITIONING
- */
-
-/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than INT32.
- * We assume that int right shift is unsigned if INT32 right shift is,
- * which should be safe.
- */
-
-#ifdef RIGHT_SHIFT_IS_UNSIGNED
-#define ISHIFT_TEMPS	int ishift_temp;
-#define IRIGHT_SHIFT(x,shft)  \
-	((ishift_temp = (x)) < 0 ? \
-	 (ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \
-	 (ishift_temp >> (shft)))
-#else
-#define ISHIFT_TEMPS
-#define IRIGHT_SHIFT(x,shft)	((x) >> (shft))
-#endif
-
-
-LOCAL(void)
-emit_byte (int val, j_compress_ptr cinfo)
-/* Write next output byte; we do not support suspension in this module. */
-{
-  struct jpeg_destination_mgr * dest = cinfo->dest;
-
-  *dest->next_output_byte++ = (JOCTET) val;
-  if (--dest->free_in_buffer == 0)
-    if (! (*dest->empty_output_buffer) (cinfo))
-      ERREXIT(cinfo, JERR_CANT_SUSPEND);
-}
-
-
-/*
- * Finish up at the end of an arithmetic-compressed scan.
- */
-
-METHODDEF(void)
-finish_pass (j_compress_ptr cinfo)
-{
-  arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
-  INT32 temp;
-
-  /* Section D.1.8: Termination of encoding */
-
-  /* Find the e->c in the coding interval with the largest
-   * number of trailing zero bits */
-  if ((temp = (e->a - 1 + e->c) & 0xFFFF0000L) < e->c)
-    e->c = temp + 0x8000L;
-  else
-    e->c = temp;
-  /* Send remaining bytes to output */
-  e->c <<= e->ct;
-  if (e->c & 0xF8000000L) {
-    /* One final overflow has to be handled */
-    if (e->buffer >= 0) {
-      if (e->zc)
-	do emit_byte(0x00, cinfo);
-	while (--e->zc);
-      emit_byte(e->buffer + 1, cinfo);
-      if (e->buffer + 1 == 0xFF)
-	emit_byte(0x00, cinfo);
-    }
-    e->zc += e->sc;  /* carry-over converts stacked 0xFF bytes to 0x00 */
-    e->sc = 0;
-  } else {
-    if (e->buffer == 0)
-      ++e->zc;
-    else if (e->buffer >= 0) {
-      if (e->zc)
-	do emit_byte(0x00, cinfo);
-	while (--e->zc);
-      emit_byte(e->buffer, cinfo);
-    }
-    if (e->sc) {
-      if (e->zc)
-	do emit_byte(0x00, cinfo);
-	while (--e->zc);
-      do {
-	emit_byte(0xFF, cinfo);
-	emit_byte(0x00, cinfo);
-      } while (--e->sc);
-    }
-  }
-  /* Output final bytes only if they are not 0x00 */
-  if (e->c & 0x7FFF800L) {
-    if (e->zc)  /* output final pending zero bytes */
-      do emit_byte(0x00, cinfo);
-      while (--e->zc);
-    emit_byte((e->c >> 19) & 0xFF, cinfo);
-    if (((e->c >> 19) & 0xFF) == 0xFF)
-      emit_byte(0x00, cinfo);
-    if (e->c & 0x7F800L) {
-      emit_byte((e->c >> 11) & 0xFF, cinfo);
-      if (((e->c >> 11) & 0xFF) == 0xFF)
-	emit_byte(0x00, cinfo);
-    }
-  }
-}
-
-
-/*
- * The core arithmetic encoding routine (common in JPEG and JBIG).
- * This needs to go as fast as possible.
- * Machine-dependent optimization facilities
- * are not utilized in this portable implementation.
- * However, this code should be fairly efficient and
- * may be a good base for further optimizations anyway.
- *
- * Parameter 'val' to be encoded may be 0 or 1 (binary decision).
- *
- * Note: I've added full "Pacman" termination support to the
- * byte output routines, which is equivalent to the optional
- * Discard_final_zeros procedure (Figure D.15) in the spec.
- * Thus, we always produce the shortest possible output
- * stream compliant to the spec (no trailing zero bytes,
- * except for FF stuffing).
- *
- * I've also introduced a new scheme for accessing
- * the probability estimation state machine table,
- * derived from Markus Kuhn's JBIG implementation.
- */
-
-LOCAL(void)
-arith_encode (j_compress_ptr cinfo, unsigned char *st, int val) 
-{
-  register arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
-  register unsigned char nl, nm;
-  register INT32 qe, temp;
-  register int sv;
-
-  /* Fetch values from our compact representation of Table D.3(D.2):
-   * Qe values and probability estimation state machine
-   */
-  sv = *st;
-  qe = jpeg_aritab[sv & 0x7F];	/* => Qe_Value */
-  nl = qe & 0xFF; qe >>= 8;	/* Next_Index_LPS + Switch_MPS */
-  nm = qe & 0xFF; qe >>= 8;	/* Next_Index_MPS */
-
-  /* Encode & estimation procedures per sections D.1.4 & D.1.5 */
-  e->a -= qe;
-  if (val != (sv >> 7)) {
-    /* Encode the less probable symbol */
-    if (e->a >= qe) {
-      /* If the interval size (qe) for the less probable symbol (LPS)
-       * is larger than the interval size for the MPS, then exchange
-       * the two symbols for coding efficiency, otherwise code the LPS
-       * as usual: */
-      e->c += e->a;
-      e->a = qe;
-    }
-    *st = (sv & 0x80) ^ nl;	/* Estimate_after_LPS */
-  } else {
-    /* Encode the more probable symbol */
-    if (e->a >= 0x8000L)
-      return;  /* A >= 0x8000 -> ready, no renormalization required */
-    if (e->a < qe) {
-      /* If the interval size (qe) for the less probable symbol (LPS)
-       * is larger than the interval size for the MPS, then exchange
-       * the two symbols for coding efficiency: */
-      e->c += e->a;
-      e->a = qe;
-    }
-    *st = (sv & 0x80) ^ nm;	/* Estimate_after_MPS */
-  }
-
-  /* Renormalization & data output per section D.1.6 */
-  do {
-    e->a <<= 1;
-    e->c <<= 1;
-    if (--e->ct == 0) {
-      /* Another byte is ready for output */
-      temp = e->c >> 19;
-      if (temp > 0xFF) {
-	/* Handle overflow over all stacked 0xFF bytes */
-	if (e->buffer >= 0) {
-	  if (e->zc)
-	    do emit_byte(0x00, cinfo);
-	    while (--e->zc);
-	  emit_byte(e->buffer + 1, cinfo);
-	  if (e->buffer + 1 == 0xFF)
-	    emit_byte(0x00, cinfo);
-	}
-	e->zc += e->sc;  /* carry-over converts stacked 0xFF bytes to 0x00 */
-	e->sc = 0;
-	/* Note: The 3 spacer bits in the C register guarantee
-	 * that the new buffer byte can't be 0xFF here
-	 * (see page 160 in the P&M JPEG book). */
-	e->buffer = temp & 0xFF;  /* new output byte, might overflow later */
-      } else if (temp == 0xFF) {
-	++e->sc;  /* stack 0xFF byte (which might overflow later) */
-      } else {
-	/* Output all stacked 0xFF bytes, they will not overflow any more */
-	if (e->buffer == 0)
-	  ++e->zc;
-	else if (e->buffer >= 0) {
-	  if (e->zc)
-	    do emit_byte(0x00, cinfo);
-	    while (--e->zc);
-	  emit_byte(e->buffer, cinfo);
-	}
-	if (e->sc) {
-	  if (e->zc)
-	    do emit_byte(0x00, cinfo);
-	    while (--e->zc);
-	  do {
-	    emit_byte(0xFF, cinfo);
-	    emit_byte(0x00, cinfo);
-	  } while (--e->sc);
-	}
-	e->buffer = temp & 0xFF;  /* new output byte (can still overflow) */
-      }
-      e->c &= 0x7FFFFL;
-      e->ct += 8;
-    }
-  } while (e->a < 0x8000L);
-}
-
-
-/*
- * Emit a restart marker & resynchronize predictions.
- */
-
-LOCAL(void)
-emit_restart (j_compress_ptr cinfo, int restart_num)
-{
-  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
-  int ci;
-  jpeg_component_info * compptr;
-
-  finish_pass(cinfo);
-
-  emit_byte(0xFF, cinfo);
-  emit_byte(JPEG_RST0 + restart_num, cinfo);
-
-  /* Re-initialize statistics areas */
-  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
-    compptr = cinfo->cur_comp_info[ci];
-    /* DC needs no table for refinement scan */
-    if (cinfo->Ss == 0 && cinfo->Ah == 0) {
-      MEMZERO(entropy->dc_stats[compptr->dc_tbl_no], DC_STAT_BINS);
-      /* Reset DC predictions to 0 */
-      entropy->last_dc_val[ci] = 0;
-      entropy->dc_context[ci] = 0;
-    }
-    /* AC needs no table when not present */
-    if (cinfo->Se) {
-      MEMZERO(entropy->ac_stats[compptr->ac_tbl_no], AC_STAT_BINS);
-    }
-  }
-
-  /* Reset arithmetic encoding variables */
-  entropy->c = 0;
-  entropy->a = 0x10000L;
-  entropy->sc = 0;
-  entropy->zc = 0;
-  entropy->ct = 11;
-  entropy->buffer = -1;  /* empty */
-}
-
-
-/*
- * MCU encoding for DC initial scan (either spectral selection,
- * or first pass of successive approximation).
- */
-
-METHODDEF(boolean)
-encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
-{
-  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
-  JBLOCKROW block;
-  unsigned char *st;
-  int blkn, ci, tbl;
-  int v, v2, m;
-  ISHIFT_TEMPS
-
-  /* Emit restart marker if needed */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0) {
-      emit_restart(cinfo, entropy->next_restart_num);
-      entropy->restarts_to_go = cinfo->restart_interval;
-      entropy->next_restart_num++;
-      entropy->next_restart_num &= 7;
-    }
-    entropy->restarts_to_go--;
-  }
-
-  /* Encode the MCU data blocks */
-  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
-    block = MCU_data[blkn];
-    ci = cinfo->MCU_membership[blkn];
-    tbl = cinfo->cur_comp_info[ci]->dc_tbl_no;
-
-    /* Compute the DC value after the required point transform by Al.
-     * This is simply an arithmetic right shift.
-     */
-    m = IRIGHT_SHIFT((int) ((*block)[0]), cinfo->Al);
-
-    /* Sections F.1.4.1 & F.1.4.4.1: Encoding of DC coefficients */
-
-    /* Table F.4: Point to statistics bin S0 for DC coefficient coding */
-    st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
-
-    /* Figure F.4: Encode_DC_DIFF */
-    if ((v = m - entropy->last_dc_val[ci]) == 0) {
-      arith_encode(cinfo, st, 0);
-      entropy->dc_context[ci] = 0;	/* zero diff category */
-    } else {
-      entropy->last_dc_val[ci] = m;
-      arith_encode(cinfo, st, 1);
-      /* Figure F.6: Encoding nonzero value v */
-      /* Figure F.7: Encoding the sign of v */
-      if (v > 0) {
-	arith_encode(cinfo, st + 1, 0);	/* Table F.4: SS = S0 + 1 */
-	st += 2;			/* Table F.4: SP = S0 + 2 */
-	entropy->dc_context[ci] = 4;	/* small positive diff category */
-      } else {
-	v = -v;
-	arith_encode(cinfo, st + 1, 1);	/* Table F.4: SS = S0 + 1 */
-	st += 3;			/* Table F.4: SN = S0 + 3 */
-	entropy->dc_context[ci] = 8;	/* small negative diff category */
-      }
-      /* Figure F.8: Encoding the magnitude category of v */
-      m = 0;
-      if (v -= 1) {
-	arith_encode(cinfo, st, 1);
-	m = 1;
-	v2 = v;
-	st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
-	while (v2 >>= 1) {
-	  arith_encode(cinfo, st, 1);
-	  m <<= 1;
-	  st += 1;
-	}
-      }
-      arith_encode(cinfo, st, 0);
-      /* Section F.1.4.4.1.2: Establish dc_context conditioning category */
-      if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
-	entropy->dc_context[ci] = 0;	/* zero diff category */
-      else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
-	entropy->dc_context[ci] += 8;	/* large diff category */
-      /* Figure F.9: Encoding the magnitude bit pattern of v */
-      st += 14;
-      while (m >>= 1)
-	arith_encode(cinfo, st, (m & v) ? 1 : 0);
-    }
-  }
-
-  return TRUE;
-}
-
-
-/*
- * MCU encoding for AC initial scan (either spectral selection,
- * or first pass of successive approximation).
- */
-
-METHODDEF(boolean)
-encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
-{
-  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
-  JBLOCKROW block;
-  unsigned char *st;
-  int tbl, k, ke;
-  int v, v2, m;
-  const int * natural_order;
-
-  /* Emit restart marker if needed */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0) {
-      emit_restart(cinfo, entropy->next_restart_num);
-      entropy->restarts_to_go = cinfo->restart_interval;
-      entropy->next_restart_num++;
-      entropy->next_restart_num &= 7;
-    }
-    entropy->restarts_to_go--;
-  }
-
-  natural_order = cinfo->natural_order;
-
-  /* Encode the MCU data block */
-  block = MCU_data[0];
-  tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
-
-  /* Sections F.1.4.2 & F.1.4.4.2: Encoding of AC coefficients */
-
-  /* Establish EOB (end-of-block) index */
-  for (ke = cinfo->Se; ke > 0; ke--)
-    /* We must apply the point transform by Al.  For AC coefficients this
-     * is an integer division with rounding towards 0.  To do this portably
-     * in C, we shift after obtaining the absolute value.
-     */
-    if ((v = (*block)[natural_order[ke]]) >= 0) {
-      if (v >>= cinfo->Al) break;
-    } else {
-      v = -v;
-      if (v >>= cinfo->Al) break;
-    }
-
-  /* Figure F.5: Encode_AC_Coefficients */
-  for (k = cinfo->Ss; k <= ke; k++) {
-    st = entropy->ac_stats[tbl] + 3 * (k - 1);
-    arith_encode(cinfo, st, 0);		/* EOB decision */
-    for (;;) {
-      if ((v = (*block)[natural_order[k]]) >= 0) {
-	if (v >>= cinfo->Al) {
-	  arith_encode(cinfo, st + 1, 1);
-	  arith_encode(cinfo, entropy->fixed_bin, 0);
-	  break;
-	}
-      } else {
-	v = -v;
-	if (v >>= cinfo->Al) {
-	  arith_encode(cinfo, st + 1, 1);
-	  arith_encode(cinfo, entropy->fixed_bin, 1);
-	  break;
-	}
-      }
-      arith_encode(cinfo, st + 1, 0); st += 3; k++;
-    }
-    st += 2;
-    /* Figure F.8: Encoding the magnitude category of v */
-    m = 0;
-    if (v -= 1) {
-      arith_encode(cinfo, st, 1);
-      m = 1;
-      v2 = v;
-      if (v2 >>= 1) {
-	arith_encode(cinfo, st, 1);
-	m <<= 1;
-	st = entropy->ac_stats[tbl] +
-	     (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
-	while (v2 >>= 1) {
-	  arith_encode(cinfo, st, 1);
-	  m <<= 1;
-	  st += 1;
-	}
-      }
-    }
-    arith_encode(cinfo, st, 0);
-    /* Figure F.9: Encoding the magnitude bit pattern of v */
-    st += 14;
-    while (m >>= 1)
-      arith_encode(cinfo, st, (m & v) ? 1 : 0);
-  }
-  /* Encode EOB decision only if k <= cinfo->Se */
-  if (k <= cinfo->Se) {
-    st = entropy->ac_stats[tbl] + 3 * (k - 1);
-    arith_encode(cinfo, st, 1);
-  }
-
-  return TRUE;
-}
-
-
-/*
- * MCU encoding for DC successive approximation refinement scan.
- */
-
-METHODDEF(boolean)
-encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
-{
-  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
-  unsigned char *st;
-  int Al, blkn;
-
-  /* Emit restart marker if needed */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0) {
-      emit_restart(cinfo, entropy->next_restart_num);
-      entropy->restarts_to_go = cinfo->restart_interval;
-      entropy->next_restart_num++;
-      entropy->next_restart_num &= 7;
-    }
-    entropy->restarts_to_go--;
-  }
-
-  st = entropy->fixed_bin;	/* use fixed probability estimation */
-  Al = cinfo->Al;
-
-  /* Encode the MCU data blocks */
-  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
-    /* We simply emit the Al'th bit of the DC coefficient value. */
-    arith_encode(cinfo, st, (MCU_data[blkn][0][0] >> Al) & 1);
-  }
-
-  return TRUE;
-}
-
-
-/*
- * MCU encoding for AC successive approximation refinement scan.
- */
-
-METHODDEF(boolean)
-encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
-{
-  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
-  JBLOCKROW block;
-  unsigned char *st;
-  int tbl, k, ke, kex;
-  int v;
-  const int * natural_order;
-
-  /* Emit restart marker if needed */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0) {
-      emit_restart(cinfo, entropy->next_restart_num);
-      entropy->restarts_to_go = cinfo->restart_interval;
-      entropy->next_restart_num++;
-      entropy->next_restart_num &= 7;
-    }
-    entropy->restarts_to_go--;
-  }
-
-  natural_order = cinfo->natural_order;
-
-  /* Encode the MCU data block */
-  block = MCU_data[0];
-  tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
-
-  /* Section G.1.3.3: Encoding of AC coefficients */
-
-  /* Establish EOB (end-of-block) index */
-  for (ke = cinfo->Se; ke > 0; ke--)
-    /* We must apply the point transform by Al.  For AC coefficients this
-     * is an integer division with rounding towards 0.  To do this portably
-     * in C, we shift after obtaining the absolute value.
-     */
-    if ((v = (*block)[natural_order[ke]]) >= 0) {
-      if (v >>= cinfo->Al) break;
-    } else {
-      v = -v;
-      if (v >>= cinfo->Al) break;
-    }
-
-  /* Establish EOBx (previous stage end-of-block) index */
-  for (kex = ke; kex > 0; kex--)
-    if ((v = (*block)[natural_order[kex]]) >= 0) {
-      if (v >>= cinfo->Ah) break;
-    } else {
-      v = -v;
-      if (v >>= cinfo->Ah) break;
-    }
-
-  /* Figure G.10: Encode_AC_Coefficients_SA */
-  for (k = cinfo->Ss; k <= ke; k++) {
-    st = entropy->ac_stats[tbl] + 3 * (k - 1);
-    if (k > kex)
-      arith_encode(cinfo, st, 0);	/* EOB decision */
-    for (;;) {
-      if ((v = (*block)[natural_order[k]]) >= 0) {
-	if (v >>= cinfo->Al) {
-	  if (v >> 1)			/* previously nonzero coef */
-	    arith_encode(cinfo, st + 2, (v & 1));
-	  else {			/* newly nonzero coef */
-	    arith_encode(cinfo, st + 1, 1);
-	    arith_encode(cinfo, entropy->fixed_bin, 0);
-	  }
-	  break;
-	}
-      } else {
-	v = -v;
-	if (v >>= cinfo->Al) {
-	  if (v >> 1)			/* previously nonzero coef */
-	    arith_encode(cinfo, st + 2, (v & 1));
-	  else {			/* newly nonzero coef */
-	    arith_encode(cinfo, st + 1, 1);
-	    arith_encode(cinfo, entropy->fixed_bin, 1);
-	  }
-	  break;
-	}
-      }
-      arith_encode(cinfo, st + 1, 0); st += 3; k++;
-    }
-  }
-  /* Encode EOB decision only if k <= cinfo->Se */
-  if (k <= cinfo->Se) {
-    st = entropy->ac_stats[tbl] + 3 * (k - 1);
-    arith_encode(cinfo, st, 1);
-  }
-
-  return TRUE;
-}
-
-
-/*
- * Encode and output one MCU's worth of arithmetic-compressed coefficients.
- */
-
-METHODDEF(boolean)
-encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
-{
-  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
-  jpeg_component_info * compptr;
-  JBLOCKROW block;
-  unsigned char *st;
-  int blkn, ci, tbl, k, ke;
-  int v, v2, m;
-  const int * natural_order;
-
-  /* Emit restart marker if needed */
-  if (cinfo->restart_interval) {
-    if (entropy->restarts_to_go == 0) {
-      emit_restart(cinfo, entropy->next_restart_num);
-      entropy->restarts_to_go = cinfo->restart_interval;
-      entropy->next_restart_num++;
-      entropy->next_restart_num &= 7;
-    }
-    entropy->restarts_to_go--;
-  }
-
-  natural_order = cinfo->natural_order;
-
-  /* Encode the MCU data blocks */
-  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
-    block = MCU_data[blkn];
-    ci = cinfo->MCU_membership[blkn];
-    compptr = cinfo->cur_comp_info[ci];
-
-    /* Sections F.1.4.1 & F.1.4.4.1: Encoding of DC coefficients */
-
-    tbl = compptr->dc_tbl_no;
-
-    /* Table F.4: Point to statistics bin S0 for DC coefficient coding */
-    st = entropy->dc_stats[tbl] + entropy->dc_context[ci];
-
-    /* Figure F.4: Encode_DC_DIFF */
-    if ((v = (*block)[0] - entropy->last_dc_val[ci]) == 0) {
-      arith_encode(cinfo, st, 0);
-      entropy->dc_context[ci] = 0;	/* zero diff category */
-    } else {
-      entropy->last_dc_val[ci] = (*block)[0];
-      arith_encode(cinfo, st, 1);
-      /* Figure F.6: Encoding nonzero value v */
-      /* Figure F.7: Encoding the sign of v */
-      if (v > 0) {
-	arith_encode(cinfo, st + 1, 0);	/* Table F.4: SS = S0 + 1 */
-	st += 2;			/* Table F.4: SP = S0 + 2 */
-	entropy->dc_context[ci] = 4;	/* small positive diff category */
-      } else {
-	v = -v;
-	arith_encode(cinfo, st + 1, 1);	/* Table F.4: SS = S0 + 1 */
-	st += 3;			/* Table F.4: SN = S0 + 3 */
-	entropy->dc_context[ci] = 8;	/* small negative diff category */
-      }
-      /* Figure F.8: Encoding the magnitude category of v */
-      m = 0;
-      if (v -= 1) {
-	arith_encode(cinfo, st, 1);
-	m = 1;
-	v2 = v;
-	st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
-	while (v2 >>= 1) {
-	  arith_encode(cinfo, st, 1);
-	  m <<= 1;
-	  st += 1;
-	}
-      }
-      arith_encode(cinfo, st, 0);
-      /* Section F.1.4.4.1.2: Establish dc_context conditioning category */
-      if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
-	entropy->dc_context[ci] = 0;	/* zero diff category */
-      else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
-	entropy->dc_context[ci] += 8;	/* large diff category */
-      /* Figure F.9: Encoding the magnitude bit pattern of v */
-      st += 14;
-      while (m >>= 1)
-	arith_encode(cinfo, st, (m & v) ? 1 : 0);
-    }
-
-    /* Sections F.1.4.2 & F.1.4.4.2: Encoding of AC coefficients */
-
-    if ((ke = cinfo->lim_Se) == 0) continue;
-    tbl = compptr->ac_tbl_no;
-
-    /* Establish EOB (end-of-block) index */
-    do {
-      if ((*block)[natural_order[ke]]) break;
-    } while (--ke);
-
-    /* Figure F.5: Encode_AC_Coefficients */
-    for (k = 0; k < ke;) {
-      st = entropy->ac_stats[tbl] + 3 * k;
-      arith_encode(cinfo, st, 0);	/* EOB decision */
-      while ((v = (*block)[natural_order[++k]]) == 0) {
-	arith_encode(cinfo, st + 1, 0);
-	st += 3;
-      }
-      arith_encode(cinfo, st + 1, 1);
-      /* Figure F.6: Encoding nonzero value v */
-      /* Figure F.7: Encoding the sign of v */
-      if (v > 0) {
-	arith_encode(cinfo, entropy->fixed_bin, 0);
-      } else {
-	v = -v;
-	arith_encode(cinfo, entropy->fixed_bin, 1);
-      }
-      st += 2;
-      /* Figure F.8: Encoding the magnitude category of v */
-      m = 0;
-      if (v -= 1) {
-	arith_encode(cinfo, st, 1);
-	m = 1;
-	v2 = v;
-	if (v2 >>= 1) {
-	  arith_encode(cinfo, st, 1);
-	  m <<= 1;
-	  st = entropy->ac_stats[tbl] +
-	       (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
-	  while (v2 >>= 1) {
-	    arith_encode(cinfo, st, 1);
-	    m <<= 1;
-	    st += 1;
-	  }
-	}
-      }
-      arith_encode(cinfo, st, 0);
-      /* Figure F.9: Encoding the magnitude bit pattern of v */
-      st += 14;
-      while (m >>= 1)
-	arith_encode(cinfo, st, (m & v) ? 1 : 0);
-    }
-    /* Encode EOB decision only if k < cinfo->lim_Se */
-    if (k < cinfo->lim_Se) {
-      st = entropy->ac_stats[tbl] + 3 * k;
-      arith_encode(cinfo, st, 1);
-    }
-  }
-
-  return TRUE;
-}
-
-
-/*
- * Initialize for an arithmetic-compressed scan.
- */
-
-METHODDEF(void)
-start_pass (j_compress_ptr cinfo, boolean gather_statistics)
-{
-  arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
-  int ci, tbl;
-  jpeg_component_info * compptr;
-
-  if (gather_statistics)
-    /* Make sure to avoid that in the master control logic!
-     * We are fully adaptive here and need no extra
-     * statistics gathering pass!
-     */
-    ERREXIT(cinfo, JERR_NOT_COMPILED);
-
-  /* We assume jcmaster.c already validated the progressive scan parameters. */
-
-  /* Select execution routines */
-  if (cinfo->progressive_mode) {
-    if (cinfo->Ah == 0) {
-      if (cinfo->Ss == 0)
-	entropy->pub.encode_mcu = encode_mcu_DC_first;
-      else
-	entropy->pub.encode_mcu = encode_mcu_AC_first;
-    } else {
-      if (cinfo->Ss == 0)
-	entropy->pub.encode_mcu = encode_mcu_DC_refine;
-      else
-	entropy->pub.encode_mcu = encode_mcu_AC_refine;
-    }
-  } else
-    entropy->pub.encode_mcu = encode_mcu;
-
-  /* Allocate & initialize requested statistics areas */
-  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
-    compptr = cinfo->cur_comp_info[ci];
-    /* DC needs no table for refinement scan */
-    if (cinfo->Ss == 0 && cinfo->Ah == 0) {
-      tbl = compptr->dc_tbl_no;
-      if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
-	ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
-      if (entropy->dc_stats[tbl] == NULL)
-	entropy->dc_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
-	  ((j_common_ptr) cinfo, JPOOL_IMAGE, DC_STAT_BINS);
-      MEMZERO(entropy->dc_stats[tbl], DC_STAT_BINS);
-      /* Initialize DC predictions to 0 */
-      entropy->last_dc_val[ci] = 0;
-      entropy->dc_context[ci] = 0;
-    }
-    /* AC needs no table when not present */
-    if (cinfo->Se) {
-      tbl = compptr->ac_tbl_no;
-      if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
-	ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
-      if (entropy->ac_stats[tbl] == NULL)
-	entropy->ac_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
-	  ((j_common_ptr) cinfo, JPOOL_IMAGE, AC_STAT_BINS);
-      MEMZERO(entropy->ac_stats[tbl], AC_STAT_BINS);
-#ifdef CALCULATE_SPECTRAL_CONDITIONING
-      if (cinfo->progressive_mode)
-	/* Section G.1.3.2: Set appropriate arithmetic conditioning value Kx */
-	cinfo->arith_ac_K[tbl] = cinfo->Ss + ((8 + cinfo->Se - cinfo->Ss) >> 4);
-#endif
-    }
-  }
-
-  /* Initialize arithmetic encoding variables */
-  entropy->c = 0;
-  entropy->a = 0x10000L;
-  entropy->sc = 0;
-  entropy->zc = 0;
-  entropy->ct = 11;
-  entropy->buffer = -1;  /* empty */
-
-  /* Initialize restart stuff */
-  entropy->restarts_to_go = cinfo->restart_interval;
-  entropy->next_restart_num = 0;
-}
-
-
-/*
- * Module initialization routine for arithmetic entropy encoding.
- */
-
-GLOBAL(void)
-jinit_arith_encoder (j_compress_ptr cinfo)
-{
-  arith_entropy_ptr entropy;
-  int i;
-
-  entropy = (arith_entropy_ptr)
-    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-				SIZEOF(arith_entropy_encoder));
-  cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
-  entropy->pub.start_pass = start_pass;
-  entropy->pub.finish_pass = finish_pass;
-
-  /* Mark tables unallocated */
-  for (i = 0; i < NUM_ARITH_TBLS; i++) {
-    entropy->dc_stats[i] = NULL;
-    entropy->ac_stats[i] = NULL;
-  }
-
-  /* Initialize index for fixed probability estimation */
-  entropy->fixed_bin[0] = 113;
-}