Initial revision

CVS patchset: 5197
CVS date: 2001/11/21 19:43:12

1 files changed, 714 insertions, 0 deletions

diff --git a/bzip2/compress.c b/bzip2/compress.c
new file mode 100644
index 000000000..cc5e31d6f
--- /dev/null
+++ b/bzip2/compress.c
@@ -0,0 +1,714 @@
+
+/*-------------------------------------------------------------*/
+/*--- Compression machinery (not incl block sorting)        ---*/
+/*---                                            compress.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+
+  1. Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+
+  2. The origin of this software must not be misrepresented; you must 
+     not claim that you wrote the original software.  If you use this 
+     software in a product, an acknowledgment in the product 
+     documentation would be appreciated but is not required.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. The name of the author may not be used to endorse or promote 
+     products derived from this software without specific prior written 
+     permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+/*--
+   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"
+
+
+/*---------------------------------------------------*/
+/*--- 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, nBytes;
+
+   /*--
+   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];
+   Int32  fave[BZ_N_GROUPS];
+
+   UInt16* mtfv = s->mtfv;
+
+   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.
+      --*/
+      for (t = 0; t < nGroups; t++)
+         BZ2_hbMakeCodeLengths ( &(s->len[t][0]), &(s->rfreq[t][0]), 
+                                 alphaSize, 20 );
+   }
+
+
+   AssertH( nGroups < 8, 3002 );
+   AssertH( nSelectors < 32768 &&
+            nSelectors <= (2 + (900000 / BZ_G_SIZE)),
+            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 > 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%8x, "
+                   "combined CRC = 0x%8x, 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, 'B' );
+      bsPutUChar ( s, 'Z' );
+      bsPutUChar ( s, 'h' );
+      bsPutUChar ( s, (UChar)('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%x\n   ", s->combinedCRC );
+      bsFinishWrite ( s );
+   }
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                        compress.c ---*/
+/*-------------------------------------------------------------*/