File Coverage

compress.c

Criterion	Covered	Total	%
statement	294	295	99.6
branch	171	186	91.9
condition			n/a
subroutine			n/a
pod			n/a
total	465	481	96.6

/*-------------------------------------------------------------*/
/*--- Compression machinery (not incl block sorting)        ---*/
/*---                                            compress.c ---*/
/*-------------------------------------------------------------*/

/* ------------------------------------------------------------------
   This file is part of bzip2/libbzip2, a program and library for
   lossless, block-sorting data compression.

   bzip2/libbzip2 version 1.0.8 of 13 July 2019
   Copyright (C) 1996-2019 Julian Seward <[e-mail]>

   Please read the WARNING, DISCLAIMER and PATENTS sections in the
   README file.

   This program is released under the terms of the license contained
   in the file LICENSE.
   ------------------------------------------------------------------ */


/* CHANGES
    0.9.0    -- original version.
    0.9.0a/b -- no changes in this file.
    0.9.0c   -- changed setting of nGroups in sendMTFValues()
                so as to do a bit better on small files
*/

#include "bzlib_private.h"

/*
  Perl-specific change to allow building with C++
  The 'register' keyword not allowed from C++17
  see https://github.com/pmqs/Compress-Raw-Bzip2/issues/11
*/
#define register

/*---------------------------------------------------*/
/*--- Bit stream I/O                              ---*/
/*---------------------------------------------------*/

/*---------------------------------------------------*/
void BZ2_bsInitWrite ( EState* s )
{
      s->bsLive = 0;
      s->bsBuff = 0;
}


/*---------------------------------------------------*/
static
void bsFinishWrite ( EState* s )
{
      while (s->bsLive > 0) {
      s->zbits[s->numZ] = (UChar)(s->bsBuff >> 24);
      s->numZ++;
            s->bsBuff <<= 8;
            s->bsLive -= 8;
   }
}


/*---------------------------------------------------*/
#define bsNEEDW(nz)                           \
{                                             \
   while (s->bsLive >= 8) {                   \
            s->zbits[s->numZ]                       \
         = (UChar)(s->bsBuff >> 24);          \
            s->numZ++;                              \
            s->bsBuff <<= 8;                        \
      s->bsLive -= 8;                         \
      }                                          \
}


/*---------------------------------------------------*/
static
__inline__
void bsW ( EState* s, Int32 n, UInt32 v )
{
      bsNEEDW ( n );
      s->bsBuff |= (v << (32 - s->bsLive - n));
      s->bsLive += n;
}


/*---------------------------------------------------*/
static
void bsPutUInt32 ( EState* s, UInt32 u )
{
      bsW ( s, 8, (u >> 24) & 0xffL );
   bsW ( s, 8, (u >> 16) & 0xffL );
      bsW ( s, 8, (u >>  8) & 0xffL );
   bsW ( s, 8,  u        & 0xffL );
}


/*---------------------------------------------------*/
static
void bsPutUChar ( EState* s, UChar c )
{
   bsW( s, 8, (UInt32)c );
}


/*---------------------------------------------------*/
/*--- The back end proper                         ---*/
/*---------------------------------------------------*/

/*---------------------------------------------------*/
static
void makeMaps_e ( EState* s )
{
      Int32 i;
      s->nInUse = 0;
      for (i = 0; i < 256; i++)
            if (s->inUse[i]) {
                  s->unseqToSeq[i] = s->nInUse;
                  s->nInUse++;
            }
}


/*---------------------------------------------------*/
static
void generateMTFValues ( EState* s )
{
      UChar   yy[256];
      Int32   i, j;
   Int32   zPend;
   Int32   wr;
   Int32   EOB;

   /*
            After sorting (eg, here),
                  s->arr1 [ 0 .. s->nblock-1 ] holds sorted order,
                  and
                  ((UChar*)s->arr2) [ 0 .. s->nblock-1 ]
                  holds the original block data.

            The first thing to do is generate the MTF values,
            and put them in
                  ((UInt16*)s->arr1) [ 0 .. s->nblock-1 ].
            Because there are strictly fewer or equal MTF values
            than block values, ptr values in this area are overwritten
            with MTF values only when they are no longer needed.

            The final compressed bitstream is generated into the
            area starting at
                  (UChar*) (&((UChar*)s->arr2)[s->nblock])

            These storage aliases are set up in bzCompressInit(),
            except for the last one, which is arranged in
            compressBlock().
      */
   UInt32* ptr   = s->ptr;
      UChar* block  = s->block;
      UInt16* mtfv  = s->mtfv;

   makeMaps_e ( s );
      EOB = s->nInUse+1;

      for (i = 0; i <= EOB; i++) s->mtfFreq[i] = 0;

      wr = 0;
      zPend = 0;
      for (i = 0; i < s->nInUse; i++) yy[i] = (UChar) i;

   for (i = 0; i < s->nblock; i++) {
            UChar ll_i;
            AssertD ( wr <= i, "generateMTFValues(1)" );
            j = ptr[i]-1; if (j < 0) j += s->nblock;
      ll_i = s->unseqToSeq[block[j]];
            AssertD ( ll_i < s->nInUse, "generateMTFValues(2a)" );

            if (yy[0] == ll_i) {
                  zPend++;
            } else {

                  if (zPend > 0) {
                        zPend--;
            while (True) {
               if (zPend & 1) {
                  mtfv[wr] = BZ_RUNB; wr++;
                  s->mtfFreq[BZ_RUNB]++;
                              } else {
                                    mtfv[wr] = BZ_RUNA; wr++;
                                    s->mtfFreq[BZ_RUNA]++;
                              }
                              if (zPend < 2) break;
                              zPend = (zPend - 2) / 2;
            };
            zPend = 0;
         }
         {
            register UChar  rtmp;
            register UChar* ryy_j;
            register UChar  rll_i;
            rtmp  = yy[1];
            yy[1] = yy[0];
            ryy_j = &(yy[1]);
            rll_i = ll_i;
            while ( rll_i != rtmp ) {
               register UChar rtmp2;
               ryy_j++;
               rtmp2  = rtmp;
               rtmp   = *ryy_j;
               *ryy_j = rtmp2;
            };
            yy[0] = rtmp;
            j = ryy_j - &(yy[0]);
            mtfv[wr] = j+1; wr++; s->mtfFreq[j+1]++;
                  }

            }
      }

      if (zPend > 0) {
            zPend--;
      while (True) {
         if (zPend & 1) {
            mtfv[wr] = BZ_RUNB; wr++;
            s->mtfFreq[BZ_RUNB]++;
                  } else {
                        mtfv[wr] = BZ_RUNA; wr++;
                        s->mtfFreq[BZ_RUNA]++;
                  }
                  if (zPend < 2) break;
                  zPend = (zPend - 2) / 2;
      };
      zPend = 0;
   }

   mtfv[wr] = EOB; wr++; s->mtfFreq[EOB]++;

      s->nMTF = wr;
}


/*---------------------------------------------------*/
#define BZ_LESSER_ICOST  0
#define BZ_GREATER_ICOST 15

static
void sendMTFValues ( EState* s )
{
      Int32 v, t, i, j, gs, ge, totc, bt, bc, iter;
      Int32 nSelectors, alphaSize, minLen, maxLen, selCtr;
      Int32 nGroups;
      Int32 nBytes = 0;

      /*--
   UChar  len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
   is a global since the decoder also needs it.

   Int32  code[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
   Int32  rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
   are also globals only used in this proc.
   Made global to keep stack frame size small.
   --*/


   UInt16 cost[BZ_N_GROUPS] = {0, 0, 0, 0, 0, 0};
   Int32  fave[BZ_N_GROUPS] = {0, 0, 0, 0, 0, 0};

   UInt16* mtfv = s->mtfv;

      ((void)nBytes); /* Silence variable ‘nBytes’ set but not used warning */
      ((void)totc); /* Silence variable ‘totc’ set but not used warning */
      if (s->verbosity >= 3)
            VPrintf3( "      %d in block, %d after MTF & 1-2 coding, "
                                "%d+2 syms in use\n",
                                s->nblock, s->nMTF, s->nInUse );

      alphaSize = s->nInUse+2;
      for (t = 0; t < BZ_N_GROUPS; t++)
            for (v = 0; v < alphaSize; v++)
                  s->len[t][v] = BZ_GREATER_ICOST;

      /*--- Decide how many coding tables to use ---*/
      AssertH ( s->nMTF > 0, 3001 );
      if (s->nMTF < 200)  nGroups = 2; else
      if (s->nMTF < 600)  nGroups = 3; else
      if (s->nMTF < 1200) nGroups = 4; else
      if (s->nMTF < 2400) nGroups = 5; else
                                              nGroups = 6;

      /*--- Generate an initial set of coding tables ---*/
      {
            Int32 nPart, remF, tFreq, aFreq;

            nPart = nGroups;
            remF  = s->nMTF;
            gs = 0;
            while (nPart > 0) {
                  tFreq = remF / nPart;
                  ge = gs-1;
                  aFreq = 0;
                  while (aFreq < tFreq && ge < alphaSize-1) {
                        ge++;
                        aFreq += s->mtfFreq[ge];
                  }

                  if (ge > gs
                          && nPart != nGroups && nPart != 1
                          && ((nGroups-nPart) % 2 == 1)) {
                        aFreq -= s->mtfFreq[ge];
                        ge--;
                  }

                  if (s->verbosity >= 3)
                        VPrintf5( "      initial group %d, [%d .. %d], "
                                            "has %d syms (%4.1f%%)\n",
                                            nPart, gs, ge, aFreq,
                                            (100.0 * (float)aFreq) / (float)(s->nMTF) );

                  for (v = 0; v < alphaSize; v++)
                        if (v >= gs && v <= ge)
                              s->len[nPart-1][v] = BZ_LESSER_ICOST; else
                              s->len[nPart-1][v] = BZ_GREATER_ICOST;

                  nPart--;
                  gs = ge+1;
                  remF -= aFreq;
            }
      }

      /*---
            Iterate up to BZ_N_ITERS times to improve the tables.
      ---*/
      for (iter = 0; iter < BZ_N_ITERS; iter++) {

            for (t = 0; t < nGroups; t++) fave[t] = 0;

            for (t = 0; t < nGroups; t++)
                  for (v = 0; v < alphaSize; v++)
                        s->rfreq[t][v] = 0;

            /*---
                Set up an auxiliary length table which is used to fast-track
		the common case (nGroups == 6).
            ---*/
            if (nGroups == 6) {
                  for (v = 0; v < alphaSize; v++) {
                        s->len_pack[v][0] = (s->len[1][v] << 16) | s->len[0][v];
                        s->len_pack[v][1] = (s->len[3][v] << 16) | s->len[2][v];
                        s->len_pack[v][2] = (s->len[5][v] << 16) | s->len[4][v];
	 	 }
            }

            nSelectors = 0;
            totc = 0;
            gs = 0;
            while (True) {

                  /*--- Set group start & end marks. --*/
                  if (gs >= s->nMTF) break;
                  ge = gs + BZ_G_SIZE - 1;
                  if (ge >= s->nMTF) ge = s->nMTF-1;

                  /*--
                        Calculate the cost of this group as coded
                        by each of the coding tables.
                  --*/
                  for (t = 0; t < nGroups; t++) cost[t] = 0;

                  if (nGroups == 6 && 50 == ge-gs+1) {
                        /*--- fast track the common case ---*/
                        register UInt32 cost01, cost23, cost45;
                        register UInt16 icv;
                        cost01 = cost23 = cost45 = 0;

#           define BZ_ITER(nn)                \
                              icv = mtfv[gs+(nn)];           \
                              cost01 += s->len_pack[icv][0]; \
                              cost23 += s->len_pack[icv][1]; \
                              cost45 += s->len_pack[icv][2]; \

                        BZ_ITER(0);  BZ_ITER(1);  BZ_ITER(2);  BZ_ITER(3);  BZ_ITER(4);
                        BZ_ITER(5);  BZ_ITER(6);  BZ_ITER(7);  BZ_ITER(8);  BZ_ITER(9);
                        BZ_ITER(10); BZ_ITER(11); BZ_ITER(12); BZ_ITER(13); BZ_ITER(14);
                        BZ_ITER(15); BZ_ITER(16); BZ_ITER(17); BZ_ITER(18); BZ_ITER(19);
                        BZ_ITER(20); BZ_ITER(21); BZ_ITER(22); BZ_ITER(23); BZ_ITER(24);
                        BZ_ITER(25); BZ_ITER(26); BZ_ITER(27); BZ_ITER(28); BZ_ITER(29);
                        BZ_ITER(30); BZ_ITER(31); BZ_ITER(32); BZ_ITER(33); BZ_ITER(34);
                        BZ_ITER(35); BZ_ITER(36); BZ_ITER(37); BZ_ITER(38); BZ_ITER(39);
                        BZ_ITER(40); BZ_ITER(41); BZ_ITER(42); BZ_ITER(43); BZ_ITER(44);
                        BZ_ITER(45); BZ_ITER(46); BZ_ITER(47); BZ_ITER(48); BZ_ITER(49);

#           undef BZ_ITER

                        cost[0] = cost01 & 0xffff; cost[1] = cost01 >> 16;
                        cost[2] = cost23 & 0xffff; cost[3] = cost23 >> 16;
                        cost[4] = cost45 & 0xffff; cost[5] = cost45 >> 16;

                  } else {
	    	    /*--- slow version which correctly handles all situations ---*/
                        for (i = gs; i <= ge; i++) {
                              UInt16 icv = mtfv[i];
                              for (t = 0; t < nGroups; t++) cost[t] += s->len[t][icv];
                        }
                  }

                  /*--
                        Find the coding table which is best for this group,
                        and record its identity in the selector table.
                  --*/
                  bc = 999999999; bt = -1;
                  for (t = 0; t < nGroups; t++)
                        if (cost[t] < bc) { bc = cost[t]; bt = t; };
                  totc += bc;
                  fave[bt]++;
                  s->selector[nSelectors] = bt;
                  nSelectors++;

                  /*--
                        Increment the symbol frequencies for the selected table.
                    --*/
                  if (nGroups == 6 && 50 == ge-gs+1) {
                        /*--- fast track the common case ---*/

#           define BZ_ITUR(nn) s->rfreq[bt][ mtfv[gs+(nn)] ]++

                        BZ_ITUR(0);  BZ_ITUR(1);  BZ_ITUR(2);  BZ_ITUR(3);  BZ_ITUR(4);
                        BZ_ITUR(5);  BZ_ITUR(6);  BZ_ITUR(7);  BZ_ITUR(8);  BZ_ITUR(9);
                        BZ_ITUR(10); BZ_ITUR(11); BZ_ITUR(12); BZ_ITUR(13); BZ_ITUR(14);
                        BZ_ITUR(15); BZ_ITUR(16); BZ_ITUR(17); BZ_ITUR(18); BZ_ITUR(19);
                        BZ_ITUR(20); BZ_ITUR(21); BZ_ITUR(22); BZ_ITUR(23); BZ_ITUR(24);
                        BZ_ITUR(25); BZ_ITUR(26); BZ_ITUR(27); BZ_ITUR(28); BZ_ITUR(29);
                        BZ_ITUR(30); BZ_ITUR(31); BZ_ITUR(32); BZ_ITUR(33); BZ_ITUR(34);
                        BZ_ITUR(35); BZ_ITUR(36); BZ_ITUR(37); BZ_ITUR(38); BZ_ITUR(39);
                        BZ_ITUR(40); BZ_ITUR(41); BZ_ITUR(42); BZ_ITUR(43); BZ_ITUR(44);
                        BZ_ITUR(45); BZ_ITUR(46); BZ_ITUR(47); BZ_ITUR(48); BZ_ITUR(49);

#           undef BZ_ITUR

                  } else {
	    	    /*--- slow version which correctly handles all situations ---*/
                        for (i = gs; i <= ge; i++)
                              s->rfreq[bt][ mtfv[i] ]++;
                  }

                  gs = ge+1;
            }
            if (s->verbosity >= 3) {
                  VPrintf2 ( "      pass %d: size is %d, grp uses are ",
                                      iter+1, totc/8 );
                  for (t = 0; t < nGroups; t++)
                        VPrintf1 ( "%d ", fave[t] );
                  VPrintf0 ( "\n" );
            }

            /*--
                Recompute the tables based on the accumulated frequencies.
            --*/
            /* maxLen was changed from 20 to 17 in bzip2-1.0.3.  See
                  comment in huffman.c for details. */
            for (t = 0; t < nGroups; t++)
                  BZ2_hbMakeCodeLengths ( &(s->len[t][0]), &(s->rfreq[t][0]),
                                                                  alphaSize, 17 /*20*/ );
      }


      AssertH( nGroups < 8, 3002 );
      AssertH( nSelectors < 32768 &&
                        nSelectors <= BZ_MAX_SELECTORS,
                        3003 );


      /*--- Compute MTF values for the selectors. ---*/
      {
            UChar pos[BZ_N_GROUPS], ll_i, tmp2, tmp;
            for (i = 0; i < nGroups; i++) pos[i] = i;
            for (i = 0; i < nSelectors; i++) {
                  ll_i = s->selector[i];
                  j = 0;
                  tmp = pos[j];
                  while ( ll_i != tmp ) {
                        j++;
                        tmp2 = tmp;
                        tmp = pos[j];
                        pos[j] = tmp2;
                  };
                  pos[0] = tmp;
                  s->selectorMtf[i] = j;
            }
      };

      /*--- Assign actual codes for the tables. --*/
      for (t = 0; t < nGroups; t++) {
            minLen = 32;
            maxLen = 0;
            for (i = 0; i < alphaSize; i++) {
                  if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
                  if (s->len[t][i] < minLen) minLen = s->len[t][i];
            }
            AssertH ( !(maxLen > 17 /*20*/ ), 3004 );
            AssertH ( !(minLen < 1),  3005 );
            BZ2_hbAssignCodes ( &(s->code[t][0]), &(s->len[t][0]),
                                                    minLen, maxLen, alphaSize );
      }

      /*--- Transmit the mapping table. ---*/
      {
            Bool inUse16[16];
            for (i = 0; i < 16; i++) {
                    inUse16[i] = False;
                    for (j = 0; j < 16; j++)
                          if (s->inUse[i * 16 + j]) inUse16[i] = True;
            }

            nBytes = s->numZ;
            for (i = 0; i < 16; i++)
                  if (inUse16[i]) bsW(s,1,1); else bsW(s,1,0);

            for (i = 0; i < 16; i++)
                  if (inUse16[i])
                        for (j = 0; j < 16; j++) {
                              if (s->inUse[i * 16 + j]) bsW(s,1,1); else bsW(s,1,0);
                        }

            if (s->verbosity >= 3)
                  VPrintf1( "      bytes: mapping %d, ", s->numZ-nBytes );
      }

      /*--- Now the selectors. ---*/
      nBytes = s->numZ;
      bsW ( s, 3, nGroups );
      bsW ( s, 15, nSelectors );
      for (i = 0; i < nSelectors; i++) {
            for (j = 0; j < s->selectorMtf[i]; j++) bsW(s,1,1);
            bsW(s,1,0);
      }
      if (s->verbosity >= 3)
            VPrintf1( "selectors %d, ", s->numZ-nBytes );

      /*--- Now the coding tables. ---*/
      nBytes = s->numZ;

      for (t = 0; t < nGroups; t++) {
            Int32 curr = s->len[t][0];
            bsW ( s, 5, curr );
            for (i = 0; i < alphaSize; i++) {
                  while (curr < s->len[t][i]) { bsW(s,2,2); curr++; /* 10 */ };
                  while (curr > s->len[t][i]) { bsW(s,2,3); curr--; /* 11 */ };
                  bsW ( s, 1, 0 );
            }
      }

      if (s->verbosity >= 3)
            VPrintf1 ( "code lengths %d, ", s->numZ-nBytes );

      /*--- And finally, the block data proper ---*/
      nBytes = s->numZ;
      selCtr = 0;
      gs = 0;
      while (True) {
            if (gs >= s->nMTF) break;
            ge = gs + BZ_G_SIZE - 1;
            if (ge >= s->nMTF) ge = s->nMTF-1;
            AssertH ( s->selector[selCtr] < nGroups, 3006 );

            if (nGroups == 6 && 50 == ge-gs+1) {
                        /*--- fast track the common case ---*/
                        UInt16 mtfv_i;
                        UChar* s_len_sel_selCtr
                              = &(s->len[s->selector[selCtr]][0]);
                        Int32* s_code_sel_selCtr
                              = &(s->code[s->selector[selCtr]][0]);

#           define BZ_ITAH(nn)                      \
                              mtfv_i = mtfv[gs+(nn)];              \
                              bsW ( s,                             \
                                          s_len_sel_selCtr[mtfv_i],      \
                                          s_code_sel_selCtr[mtfv_i] )

                        BZ_ITAH(0);  BZ_ITAH(1);  BZ_ITAH(2);  BZ_ITAH(3);  BZ_ITAH(4);
                        BZ_ITAH(5);  BZ_ITAH(6);  BZ_ITAH(7);  BZ_ITAH(8);  BZ_ITAH(9);
                        BZ_ITAH(10); BZ_ITAH(11); BZ_ITAH(12); BZ_ITAH(13); BZ_ITAH(14);
                        BZ_ITAH(15); BZ_ITAH(16); BZ_ITAH(17); BZ_ITAH(18); BZ_ITAH(19);
                        BZ_ITAH(20); BZ_ITAH(21); BZ_ITAH(22); BZ_ITAH(23); BZ_ITAH(24);
                        BZ_ITAH(25); BZ_ITAH(26); BZ_ITAH(27); BZ_ITAH(28); BZ_ITAH(29);
                        BZ_ITAH(30); BZ_ITAH(31); BZ_ITAH(32); BZ_ITAH(33); BZ_ITAH(34);
                        BZ_ITAH(35); BZ_ITAH(36); BZ_ITAH(37); BZ_ITAH(38); BZ_ITAH(39);
                        BZ_ITAH(40); BZ_ITAH(41); BZ_ITAH(42); BZ_ITAH(43); BZ_ITAH(44);
                        BZ_ITAH(45); BZ_ITAH(46); BZ_ITAH(47); BZ_ITAH(48); BZ_ITAH(49);

#           undef BZ_ITAH

            } else {
	 	 /*--- slow version which correctly handles all situations ---*/
                  for (i = gs; i <= ge; i++) {
                        bsW ( s,
                                    s->len  [s->selector[selCtr]] [mtfv[i]],
                                    s->code [s->selector[selCtr]] [mtfv[i]] );
                  }
            }


            gs = ge+1;
            selCtr++;
      }
      AssertH( selCtr == nSelectors, 3007 );

      if (s->verbosity >= 3)
            VPrintf1( "codes %d\n", s->numZ-nBytes );
}


/*---------------------------------------------------*/
void BZ2_compressBlock ( EState* s, Bool is_last_block )
{
      if (s->nblock > 0) {

            BZ_FINALISE_CRC ( s->blockCRC );
            s->combinedCRC = (s->combinedCRC << 1) | (s->combinedCRC >> 31);
            s->combinedCRC ^= s->blockCRC;
            if (s->blockNo > 1) s->numZ = 0;

            if (s->verbosity >= 2)
                  VPrintf4( "    block %d: crc = 0x%08x, "
                                      "combined CRC = 0x%08x, size = %d\n",
                                      s->blockNo, s->blockCRC, s->combinedCRC, s->nblock );

            BZ2_blockSort ( s );
      }

      s->zbits = (UChar*) (&((UChar*)s->arr2)[s->nblock]);

      /*-- If this is the first block, create the stream header. --*/
      if (s->blockNo == 1) {
            BZ2_bsInitWrite ( s );
            bsPutUChar ( s, BZ_HDR_B );
            bsPutUChar ( s, BZ_HDR_Z );
            bsPutUChar ( s, BZ_HDR_h );
            bsPutUChar ( s, (UChar)(BZ_HDR_0 + s->blockSize100k) );
      }

      if (s->nblock > 0) {

            bsPutUChar ( s, 0x31 ); bsPutUChar ( s, 0x41 );
            bsPutUChar ( s, 0x59 ); bsPutUChar ( s, 0x26 );
            bsPutUChar ( s, 0x53 ); bsPutUChar ( s, 0x59 );

            /*-- Now the block's CRC, so it is in a known place. --*/
            bsPutUInt32 ( s, s->blockCRC );

            /*--
                  Now a single bit indicating (non-)randomisation.
                  As of version 0.9.5, we use a better sorting algorithm
                  which makes randomisation unnecessary.  So always set
                  the randomised bit to 'no'.  Of course, the decoder
                  still needs to be able to handle randomised blocks
                  so as to maintain backwards compatibility with
                  older versions of bzip2.
            --*/
            bsW(s,1,0);

            bsW ( s, 24, s->origPtr );
            generateMTFValues ( s );
            sendMTFValues ( s );
      }


      /*-- If this is the last block, add the stream trailer. --*/
      if (is_last_block) {

            bsPutUChar ( s, 0x17 ); bsPutUChar ( s, 0x72 );
            bsPutUChar ( s, 0x45 ); bsPutUChar ( s, 0x38 );
            bsPutUChar ( s, 0x50 ); bsPutUChar ( s, 0x90 );
            bsPutUInt32 ( s, s->combinedCRC );
            if (s->verbosity >= 2)
                  VPrintf1( "    final combined CRC = 0x%08x\n   ", s->combinedCRC );
            bsFinishWrite ( s );
      }
}


/*-------------------------------------------------------------*/
/*--- end                                        compress.c ---*/
/*-------------------------------------------------------------*/