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loizides |
1.1 |
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/*-------------------------------------------------------------*/
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/*--- Compression machinery (not incl block sorting) ---*/
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/*--- compress.c ---*/
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/*-------------------------------------------------------------*/
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/* ------------------------------------------------------------------
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This file is part of bzip2/libbzip2, a program and library for
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lossless, block-sorting data compression.
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bzip2/libbzip2 version 1.0.5 of 10 December 2007
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Copyright (C) 1996-2007 Julian Seward <jseward@bzip.org>
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Please read the WARNING, DISCLAIMER and PATENTS sections in the
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README file.
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This program is released under the terms of the license contained
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in the file LICENSE.
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------------------------------------------------------------------ */
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/* CHANGES
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0.9.0 -- original version.
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0.9.0a/b -- no changes in this file.
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0.9.0c -- changed setting of nGroups in sendMTFValues()
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so as to do a bit better on small files
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*/
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#include "bzlib_private.h"
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/*---------------------------------------------------*/
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/*--- Bit stream I/O ---*/
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/*---------------------------------------------------*/
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/*---------------------------------------------------*/
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void BZ2_bsInitWrite ( EState* s )
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| 38 |
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{
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s->bsLive = 0;
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s->bsBuff = 0;
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}
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/*---------------------------------------------------*/
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static
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void bsFinishWrite ( EState* s )
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{
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while (s->bsLive > 0) {
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s->zbits[s->numZ] = (UChar)(s->bsBuff >> 24);
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s->numZ++;
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s->bsBuff <<= 8;
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s->bsLive -= 8;
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}
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}
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| 56 |
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/*---------------------------------------------------*/
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#define bsNEEDW(nz) \
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{ \
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while (s->bsLive >= 8) { \
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s->zbits[s->numZ] \
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= (UChar)(s->bsBuff >> 24); \
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s->numZ++; \
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s->bsBuff <<= 8; \
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s->bsLive -= 8; \
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} \
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}
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/*---------------------------------------------------*/
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static
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__inline__
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void bsW ( EState* s, Int32 n, UInt32 v )
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{
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bsNEEDW ( n );
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s->bsBuff |= (v << (32 - s->bsLive - n));
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s->bsLive += n;
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}
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/*---------------------------------------------------*/
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static
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void bsPutUInt32 ( EState* s, UInt32 u )
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{
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bsW ( s, 8, (u >> 24) & 0xffL );
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bsW ( s, 8, (u >> 16) & 0xffL );
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bsW ( s, 8, (u >> 8) & 0xffL );
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bsW ( s, 8, u & 0xffL );
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}
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/*---------------------------------------------------*/
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static
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void bsPutUChar ( EState* s, UChar c )
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{
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bsW( s, 8, (UInt32)c );
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}
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/*---------------------------------------------------*/
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/*--- The back end proper ---*/
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/*---------------------------------------------------*/
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/*---------------------------------------------------*/
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static
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void makeMaps_e ( EState* s )
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{
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Int32 i;
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s->nInUse = 0;
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for (i = 0; i < 256; i++)
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| 111 |
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if (s->inUse[i]) {
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s->unseqToSeq[i] = s->nInUse;
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s->nInUse++;
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}
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}
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/*---------------------------------------------------*/
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static
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void generateMTFValues ( EState* s )
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{
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UChar yy[256];
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Int32 i, j;
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Int32 zPend;
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| 125 |
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Int32 wr;
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Int32 EOB;
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| 128 |
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/*
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After sorting (eg, here),
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s->arr1 [ 0 .. s->nblock-1 ] holds sorted order,
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and
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((UChar*)s->arr2) [ 0 .. s->nblock-1 ]
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| 133 |
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holds the original block data.
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| 135 |
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The first thing to do is generate the MTF values,
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and put them in
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| 137 |
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((UInt16*)s->arr1) [ 0 .. s->nblock-1 ].
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Because there are strictly fewer or equal MTF values
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than block values, ptr values in this area are overwritten
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with MTF values only when they are no longer needed.
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| 142 |
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The final compressed bitstream is generated into the
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area starting at
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| 144 |
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(UChar*) (&((UChar*)s->arr2)[s->nblock])
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| 145 |
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| 146 |
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These storage aliases are set up in bzCompressInit(),
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| 147 |
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except for the last one, which is arranged in
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| 148 |
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compressBlock().
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| 149 |
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*/
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| 150 |
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UInt32* ptr = s->ptr;
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| 151 |
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UChar* block = s->block;
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| 152 |
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UInt16* mtfv = s->mtfv;
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| 153 |
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makeMaps_e ( s );
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EOB = s->nInUse+1;
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for (i = 0; i <= EOB; i++) s->mtfFreq[i] = 0;
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| 159 |
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wr = 0;
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zPend = 0;
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for (i = 0; i < s->nInUse; i++) yy[i] = (UChar) i;
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| 162 |
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| 163 |
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for (i = 0; i < s->nblock; i++) {
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| 164 |
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UChar ll_i;
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| 165 |
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AssertD ( wr <= i, "generateMTFValues(1)" );
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| 166 |
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j = ptr[i]-1; if (j < 0) j += s->nblock;
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ll_i = s->unseqToSeq[block[j]];
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AssertD ( ll_i < s->nInUse, "generateMTFValues(2a)" );
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| 170 |
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if (yy[0] == ll_i) {
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zPend++;
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| 172 |
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} else {
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| 173 |
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| 174 |
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if (zPend > 0) {
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zPend--;
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while (True) {
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| 177 |
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if (zPend & 1) {
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mtfv[wr] = BZ_RUNB; wr++;
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s->mtfFreq[BZ_RUNB]++;
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} else {
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mtfv[wr] = BZ_RUNA; wr++;
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s->mtfFreq[BZ_RUNA]++;
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}
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if (zPend < 2) break;
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zPend = (zPend - 2) / 2;
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| 186 |
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};
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| 187 |
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zPend = 0;
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| 188 |
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}
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| 189 |
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{
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| 190 |
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register UChar rtmp;
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| 191 |
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register UChar* ryy_j;
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| 192 |
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register UChar rll_i;
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| 193 |
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rtmp = yy[1];
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yy[1] = yy[0];
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ryy_j = &(yy[1]);
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rll_i = ll_i;
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| 197 |
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while ( rll_i != rtmp ) {
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| 198 |
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register UChar rtmp2;
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| 199 |
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ryy_j++;
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rtmp2 = rtmp;
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rtmp = *ryy_j;
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*ryy_j = rtmp2;
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};
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yy[0] = rtmp;
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j = ryy_j - &(yy[0]);
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mtfv[wr] = j+1; wr++; s->mtfFreq[j+1]++;
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| 207 |
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}
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| 208 |
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| 209 |
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}
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| 210 |
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}
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| 211 |
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| 212 |
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if (zPend > 0) {
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| 213 |
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zPend--;
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| 214 |
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while (True) {
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if (zPend & 1) {
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| 216 |
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mtfv[wr] = BZ_RUNB; wr++;
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| 217 |
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s->mtfFreq[BZ_RUNB]++;
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| 218 |
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} else {
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| 219 |
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mtfv[wr] = BZ_RUNA; wr++;
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| 220 |
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s->mtfFreq[BZ_RUNA]++;
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}
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if (zPend < 2) break;
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zPend = (zPend - 2) / 2;
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| 224 |
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};
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| 225 |
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zPend = 0;
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| 226 |
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}
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| 227 |
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| 228 |
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mtfv[wr] = EOB; wr++; s->mtfFreq[EOB]++;
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| 230 |
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s->nMTF = wr;
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| 231 |
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}
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| 233 |
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/*---------------------------------------------------*/
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#define BZ_LESSER_ICOST 0
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#define BZ_GREATER_ICOST 15
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| 238 |
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static
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| 239 |
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void sendMTFValues ( EState* s )
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| 240 |
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{
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| 241 |
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Int32 v, t, i, j, gs, ge, totc, bt, bc, iter;
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| 242 |
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Int32 nSelectors, alphaSize, minLen, maxLen, selCtr;
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| 243 |
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Int32 nGroups, nBytes;
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| 244 |
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| 245 |
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/*--
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| 246 |
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UChar len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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| 247 |
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is a global since the decoder also needs it.
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| 248 |
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| 249 |
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Int32 code[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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| 250 |
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Int32 rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
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| 251 |
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are also globals only used in this proc.
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| 252 |
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Made global to keep stack frame size small.
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| 253 |
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--*/
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| 254 |
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| 255 |
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| 256 |
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UInt16 cost[BZ_N_GROUPS];
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| 257 |
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Int32 fave[BZ_N_GROUPS];
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| 258 |
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| 259 |
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UInt16* mtfv = s->mtfv;
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| 260 |
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| 261 |
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if (s->verbosity >= 3)
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| 262 |
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VPrintf3( " %d in block, %d after MTF & 1-2 coding, "
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| 263 |
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"%d+2 syms in use\n",
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| 264 |
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s->nblock, s->nMTF, s->nInUse );
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| 265 |
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| 266 |
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alphaSize = s->nInUse+2;
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| 267 |
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for (t = 0; t < BZ_N_GROUPS; t++)
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| 268 |
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for (v = 0; v < alphaSize; v++)
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| 269 |
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s->len[t][v] = BZ_GREATER_ICOST;
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| 270 |
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| 271 |
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/*--- Decide how many coding tables to use ---*/
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| 272 |
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AssertH ( s->nMTF > 0, 3001 );
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| 273 |
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if (s->nMTF < 200) nGroups = 2; else
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| 274 |
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if (s->nMTF < 600) nGroups = 3; else
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| 275 |
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if (s->nMTF < 1200) nGroups = 4; else
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| 276 |
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if (s->nMTF < 2400) nGroups = 5; else
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| 277 |
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nGroups = 6;
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| 278 |
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| 279 |
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/*--- Generate an initial set of coding tables ---*/
|
| 280 |
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{
|
| 281 |
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Int32 nPart, remF, tFreq, aFreq;
|
| 282 |
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| 283 |
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nPart = nGroups;
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| 284 |
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remF = s->nMTF;
|
| 285 |
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gs = 0;
|
| 286 |
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while (nPart > 0) {
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| 287 |
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tFreq = remF / nPart;
|
| 288 |
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ge = gs-1;
|
| 289 |
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aFreq = 0;
|
| 290 |
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while (aFreq < tFreq && ge < alphaSize-1) {
|
| 291 |
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ge++;
|
| 292 |
|
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aFreq += s->mtfFreq[ge];
|
| 293 |
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}
|
| 294 |
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| 295 |
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if (ge > gs
|
| 296 |
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&& nPart != nGroups && nPart != 1
|
| 297 |
|
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&& ((nGroups-nPart) % 2 == 1)) {
|
| 298 |
|
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aFreq -= s->mtfFreq[ge];
|
| 299 |
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ge--;
|
| 300 |
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}
|
| 301 |
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|
| 302 |
|
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if (s->verbosity >= 3)
|
| 303 |
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VPrintf5( " initial group %d, [%d .. %d], "
|
| 304 |
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"has %d syms (%4.1f%%)\n",
|
| 305 |
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nPart, gs, ge, aFreq,
|
| 306 |
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(100.0 * (float)aFreq) / (float)(s->nMTF) );
|
| 307 |
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|
| 308 |
|
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for (v = 0; v < alphaSize; v++)
|
| 309 |
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if (v >= gs && v <= ge)
|
| 310 |
|
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s->len[nPart-1][v] = BZ_LESSER_ICOST; else
|
| 311 |
|
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s->len[nPart-1][v] = BZ_GREATER_ICOST;
|
| 312 |
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|
| 313 |
|
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nPart--;
|
| 314 |
|
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gs = ge+1;
|
| 315 |
|
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remF -= aFreq;
|
| 316 |
|
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}
|
| 317 |
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}
|
| 318 |
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|
| 319 |
|
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/*---
|
| 320 |
|
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Iterate up to BZ_N_ITERS times to improve the tables.
|
| 321 |
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---*/
|
| 322 |
|
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for (iter = 0; iter < BZ_N_ITERS; iter++) {
|
| 323 |
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|
| 324 |
|
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for (t = 0; t < nGroups; t++) fave[t] = 0;
|
| 325 |
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|
| 326 |
|
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for (t = 0; t < nGroups; t++)
|
| 327 |
|
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for (v = 0; v < alphaSize; v++)
|
| 328 |
|
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s->rfreq[t][v] = 0;
|
| 329 |
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|
| 330 |
|
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/*---
|
| 331 |
|
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Set up an auxiliary length table which is used to fast-track
|
| 332 |
|
|
the common case (nGroups == 6).
|
| 333 |
|
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---*/
|
| 334 |
|
|
if (nGroups == 6) {
|
| 335 |
|
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for (v = 0; v < alphaSize; v++) {
|
| 336 |
|
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s->len_pack[v][0] = (s->len[1][v] << 16) | s->len[0][v];
|
| 337 |
|
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s->len_pack[v][1] = (s->len[3][v] << 16) | s->len[2][v];
|
| 338 |
|
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s->len_pack[v][2] = (s->len[5][v] << 16) | s->len[4][v];
|
| 339 |
|
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}
|
| 340 |
|
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}
|
| 341 |
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|
| 342 |
|
|
nSelectors = 0;
|
| 343 |
|
|
totc = 0;
|
| 344 |
|
|
gs = 0;
|
| 345 |
|
|
while (True) {
|
| 346 |
|
|
|
| 347 |
|
|
/*--- Set group start & end marks. --*/
|
| 348 |
|
|
if (gs >= s->nMTF) break;
|
| 349 |
|
|
ge = gs + BZ_G_SIZE - 1;
|
| 350 |
|
|
if (ge >= s->nMTF) ge = s->nMTF-1;
|
| 351 |
|
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|
| 352 |
|
|
/*--
|
| 353 |
|
|
Calculate the cost of this group as coded
|
| 354 |
|
|
by each of the coding tables.
|
| 355 |
|
|
--*/
|
| 356 |
|
|
for (t = 0; t < nGroups; t++) cost[t] = 0;
|
| 357 |
|
|
|
| 358 |
|
|
if (nGroups == 6 && 50 == ge-gs+1) {
|
| 359 |
|
|
/*--- fast track the common case ---*/
|
| 360 |
|
|
register UInt32 cost01, cost23, cost45;
|
| 361 |
|
|
register UInt16 icv;
|
| 362 |
|
|
cost01 = cost23 = cost45 = 0;
|
| 363 |
|
|
|
| 364 |
|
|
# define BZ_ITER(nn) \
|
| 365 |
|
|
icv = mtfv[gs+(nn)]; \
|
| 366 |
|
|
cost01 += s->len_pack[icv][0]; \
|
| 367 |
|
|
cost23 += s->len_pack[icv][1]; \
|
| 368 |
|
|
cost45 += s->len_pack[icv][2]; \
|
| 369 |
|
|
|
| 370 |
|
|
BZ_ITER(0); BZ_ITER(1); BZ_ITER(2); BZ_ITER(3); BZ_ITER(4);
|
| 371 |
|
|
BZ_ITER(5); BZ_ITER(6); BZ_ITER(7); BZ_ITER(8); BZ_ITER(9);
|
| 372 |
|
|
BZ_ITER(10); BZ_ITER(11); BZ_ITER(12); BZ_ITER(13); BZ_ITER(14);
|
| 373 |
|
|
BZ_ITER(15); BZ_ITER(16); BZ_ITER(17); BZ_ITER(18); BZ_ITER(19);
|
| 374 |
|
|
BZ_ITER(20); BZ_ITER(21); BZ_ITER(22); BZ_ITER(23); BZ_ITER(24);
|
| 375 |
|
|
BZ_ITER(25); BZ_ITER(26); BZ_ITER(27); BZ_ITER(28); BZ_ITER(29);
|
| 376 |
|
|
BZ_ITER(30); BZ_ITER(31); BZ_ITER(32); BZ_ITER(33); BZ_ITER(34);
|
| 377 |
|
|
BZ_ITER(35); BZ_ITER(36); BZ_ITER(37); BZ_ITER(38); BZ_ITER(39);
|
| 378 |
|
|
BZ_ITER(40); BZ_ITER(41); BZ_ITER(42); BZ_ITER(43); BZ_ITER(44);
|
| 379 |
|
|
BZ_ITER(45); BZ_ITER(46); BZ_ITER(47); BZ_ITER(48); BZ_ITER(49);
|
| 380 |
|
|
|
| 381 |
|
|
# undef BZ_ITER
|
| 382 |
|
|
|
| 383 |
|
|
cost[0] = cost01 & 0xffff; cost[1] = cost01 >> 16;
|
| 384 |
|
|
cost[2] = cost23 & 0xffff; cost[3] = cost23 >> 16;
|
| 385 |
|
|
cost[4] = cost45 & 0xffff; cost[5] = cost45 >> 16;
|
| 386 |
|
|
|
| 387 |
|
|
} else {
|
| 388 |
|
|
/*--- slow version which correctly handles all situations ---*/
|
| 389 |
|
|
for (i = gs; i <= ge; i++) {
|
| 390 |
|
|
UInt16 icv = mtfv[i];
|
| 391 |
|
|
for (t = 0; t < nGroups; t++) cost[t] += s->len[t][icv];
|
| 392 |
|
|
}
|
| 393 |
|
|
}
|
| 394 |
|
|
|
| 395 |
|
|
/*--
|
| 396 |
|
|
Find the coding table which is best for this group,
|
| 397 |
|
|
and record its identity in the selector table.
|
| 398 |
|
|
--*/
|
| 399 |
|
|
bc = 999999999; bt = -1;
|
| 400 |
|
|
for (t = 0; t < nGroups; t++)
|
| 401 |
|
|
if (cost[t] < bc) { bc = cost[t]; bt = t; };
|
| 402 |
|
|
totc += bc;
|
| 403 |
|
|
fave[bt]++;
|
| 404 |
|
|
s->selector[nSelectors] = bt;
|
| 405 |
|
|
nSelectors++;
|
| 406 |
|
|
|
| 407 |
|
|
/*--
|
| 408 |
|
|
Increment the symbol frequencies for the selected table.
|
| 409 |
|
|
--*/
|
| 410 |
|
|
if (nGroups == 6 && 50 == ge-gs+1) {
|
| 411 |
|
|
/*--- fast track the common case ---*/
|
| 412 |
|
|
|
| 413 |
|
|
# define BZ_ITUR(nn) s->rfreq[bt][ mtfv[gs+(nn)] ]++
|
| 414 |
|
|
|
| 415 |
|
|
BZ_ITUR(0); BZ_ITUR(1); BZ_ITUR(2); BZ_ITUR(3); BZ_ITUR(4);
|
| 416 |
|
|
BZ_ITUR(5); BZ_ITUR(6); BZ_ITUR(7); BZ_ITUR(8); BZ_ITUR(9);
|
| 417 |
|
|
BZ_ITUR(10); BZ_ITUR(11); BZ_ITUR(12); BZ_ITUR(13); BZ_ITUR(14);
|
| 418 |
|
|
BZ_ITUR(15); BZ_ITUR(16); BZ_ITUR(17); BZ_ITUR(18); BZ_ITUR(19);
|
| 419 |
|
|
BZ_ITUR(20); BZ_ITUR(21); BZ_ITUR(22); BZ_ITUR(23); BZ_ITUR(24);
|
| 420 |
|
|
BZ_ITUR(25); BZ_ITUR(26); BZ_ITUR(27); BZ_ITUR(28); BZ_ITUR(29);
|
| 421 |
|
|
BZ_ITUR(30); BZ_ITUR(31); BZ_ITUR(32); BZ_ITUR(33); BZ_ITUR(34);
|
| 422 |
|
|
BZ_ITUR(35); BZ_ITUR(36); BZ_ITUR(37); BZ_ITUR(38); BZ_ITUR(39);
|
| 423 |
|
|
BZ_ITUR(40); BZ_ITUR(41); BZ_ITUR(42); BZ_ITUR(43); BZ_ITUR(44);
|
| 424 |
|
|
BZ_ITUR(45); BZ_ITUR(46); BZ_ITUR(47); BZ_ITUR(48); BZ_ITUR(49);
|
| 425 |
|
|
|
| 426 |
|
|
# undef BZ_ITUR
|
| 427 |
|
|
|
| 428 |
|
|
} else {
|
| 429 |
|
|
/*--- slow version which correctly handles all situations ---*/
|
| 430 |
|
|
for (i = gs; i <= ge; i++)
|
| 431 |
|
|
s->rfreq[bt][ mtfv[i] ]++;
|
| 432 |
|
|
}
|
| 433 |
|
|
|
| 434 |
|
|
gs = ge+1;
|
| 435 |
|
|
}
|
| 436 |
|
|
if (s->verbosity >= 3) {
|
| 437 |
|
|
VPrintf2 ( " pass %d: size is %d, grp uses are ",
|
| 438 |
|
|
iter+1, totc/8 );
|
| 439 |
|
|
for (t = 0; t < nGroups; t++)
|
| 440 |
|
|
VPrintf1 ( "%d ", fave[t] );
|
| 441 |
|
|
VPrintf0 ( "\n" );
|
| 442 |
|
|
}
|
| 443 |
|
|
|
| 444 |
|
|
/*--
|
| 445 |
|
|
Recompute the tables based on the accumulated frequencies.
|
| 446 |
|
|
--*/
|
| 447 |
|
|
/* maxLen was changed from 20 to 17 in bzip2-1.0.3. See
|
| 448 |
|
|
comment in huffman.c for details. */
|
| 449 |
|
|
for (t = 0; t < nGroups; t++)
|
| 450 |
|
|
BZ2_hbMakeCodeLengths ( &(s->len[t][0]), &(s->rfreq[t][0]),
|
| 451 |
|
|
alphaSize, 17 /*20*/ );
|
| 452 |
|
|
}
|
| 453 |
|
|
|
| 454 |
|
|
|
| 455 |
|
|
AssertH( nGroups < 8, 3002 );
|
| 456 |
|
|
AssertH( nSelectors < 32768 &&
|
| 457 |
|
|
nSelectors <= (2 + (900000 / BZ_G_SIZE)),
|
| 458 |
|
|
3003 );
|
| 459 |
|
|
|
| 460 |
|
|
|
| 461 |
|
|
/*--- Compute MTF values for the selectors. ---*/
|
| 462 |
|
|
{
|
| 463 |
|
|
UChar pos[BZ_N_GROUPS], ll_i, tmp2, tmp;
|
| 464 |
|
|
for (i = 0; i < nGroups; i++) pos[i] = i;
|
| 465 |
|
|
for (i = 0; i < nSelectors; i++) {
|
| 466 |
|
|
ll_i = s->selector[i];
|
| 467 |
|
|
j = 0;
|
| 468 |
|
|
tmp = pos[j];
|
| 469 |
|
|
while ( ll_i != tmp ) {
|
| 470 |
|
|
j++;
|
| 471 |
|
|
tmp2 = tmp;
|
| 472 |
|
|
tmp = pos[j];
|
| 473 |
|
|
pos[j] = tmp2;
|
| 474 |
|
|
};
|
| 475 |
|
|
pos[0] = tmp;
|
| 476 |
|
|
s->selectorMtf[i] = j;
|
| 477 |
|
|
}
|
| 478 |
|
|
};
|
| 479 |
|
|
|
| 480 |
|
|
/*--- Assign actual codes for the tables. --*/
|
| 481 |
|
|
for (t = 0; t < nGroups; t++) {
|
| 482 |
|
|
minLen = 32;
|
| 483 |
|
|
maxLen = 0;
|
| 484 |
|
|
for (i = 0; i < alphaSize; i++) {
|
| 485 |
|
|
if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
|
| 486 |
|
|
if (s->len[t][i] < minLen) minLen = s->len[t][i];
|
| 487 |
|
|
}
|
| 488 |
|
|
AssertH ( !(maxLen > 17 /*20*/ ), 3004 );
|
| 489 |
|
|
AssertH ( !(minLen < 1), 3005 );
|
| 490 |
|
|
BZ2_hbAssignCodes ( &(s->code[t][0]), &(s->len[t][0]),
|
| 491 |
|
|
minLen, maxLen, alphaSize );
|
| 492 |
|
|
}
|
| 493 |
|
|
|
| 494 |
|
|
/*--- Transmit the mapping table. ---*/
|
| 495 |
|
|
{
|
| 496 |
|
|
Bool inUse16[16];
|
| 497 |
|
|
for (i = 0; i < 16; i++) {
|
| 498 |
|
|
inUse16[i] = False;
|
| 499 |
|
|
for (j = 0; j < 16; j++)
|
| 500 |
|
|
if (s->inUse[i * 16 + j]) inUse16[i] = True;
|
| 501 |
|
|
}
|
| 502 |
|
|
|
| 503 |
|
|
nBytes = s->numZ;
|
| 504 |
|
|
for (i = 0; i < 16; i++)
|
| 505 |
|
|
if (inUse16[i]) bsW(s,1,1); else bsW(s,1,0);
|
| 506 |
|
|
|
| 507 |
|
|
for (i = 0; i < 16; i++)
|
| 508 |
|
|
if (inUse16[i])
|
| 509 |
|
|
for (j = 0; j < 16; j++) {
|
| 510 |
|
|
if (s->inUse[i * 16 + j]) bsW(s,1,1); else bsW(s,1,0);
|
| 511 |
|
|
}
|
| 512 |
|
|
|
| 513 |
|
|
if (s->verbosity >= 3)
|
| 514 |
|
|
VPrintf1( " bytes: mapping %d, ", s->numZ-nBytes );
|
| 515 |
|
|
}
|
| 516 |
|
|
|
| 517 |
|
|
/*--- Now the selectors. ---*/
|
| 518 |
|
|
nBytes = s->numZ;
|
| 519 |
|
|
bsW ( s, 3, nGroups );
|
| 520 |
|
|
bsW ( s, 15, nSelectors );
|
| 521 |
|
|
for (i = 0; i < nSelectors; i++) {
|
| 522 |
|
|
for (j = 0; j < s->selectorMtf[i]; j++) bsW(s,1,1);
|
| 523 |
|
|
bsW(s,1,0);
|
| 524 |
|
|
}
|
| 525 |
|
|
if (s->verbosity >= 3)
|
| 526 |
|
|
VPrintf1( "selectors %d, ", s->numZ-nBytes );
|
| 527 |
|
|
|
| 528 |
|
|
/*--- Now the coding tables. ---*/
|
| 529 |
|
|
nBytes = s->numZ;
|
| 530 |
|
|
|
| 531 |
|
|
for (t = 0; t < nGroups; t++) {
|
| 532 |
|
|
Int32 curr = s->len[t][0];
|
| 533 |
|
|
bsW ( s, 5, curr );
|
| 534 |
|
|
for (i = 0; i < alphaSize; i++) {
|
| 535 |
|
|
while (curr < s->len[t][i]) { bsW(s,2,2); curr++; /* 10 */ };
|
| 536 |
|
|
while (curr > s->len[t][i]) { bsW(s,2,3); curr--; /* 11 */ };
|
| 537 |
|
|
bsW ( s, 1, 0 );
|
| 538 |
|
|
}
|
| 539 |
|
|
}
|
| 540 |
|
|
|
| 541 |
|
|
if (s->verbosity >= 3)
|
| 542 |
|
|
VPrintf1 ( "code lengths %d, ", s->numZ-nBytes );
|
| 543 |
|
|
|
| 544 |
|
|
/*--- And finally, the block data proper ---*/
|
| 545 |
|
|
nBytes = s->numZ;
|
| 546 |
|
|
selCtr = 0;
|
| 547 |
|
|
gs = 0;
|
| 548 |
|
|
while (True) {
|
| 549 |
|
|
if (gs >= s->nMTF) break;
|
| 550 |
|
|
ge = gs + BZ_G_SIZE - 1;
|
| 551 |
|
|
if (ge >= s->nMTF) ge = s->nMTF-1;
|
| 552 |
|
|
AssertH ( s->selector[selCtr] < nGroups, 3006 );
|
| 553 |
|
|
|
| 554 |
|
|
if (nGroups == 6 && 50 == ge-gs+1) {
|
| 555 |
|
|
/*--- fast track the common case ---*/
|
| 556 |
|
|
UInt16 mtfv_i;
|
| 557 |
|
|
UChar* s_len_sel_selCtr
|
| 558 |
|
|
= &(s->len[s->selector[selCtr]][0]);
|
| 559 |
|
|
Int32* s_code_sel_selCtr
|
| 560 |
|
|
= &(s->code[s->selector[selCtr]][0]);
|
| 561 |
|
|
|
| 562 |
|
|
# define BZ_ITAH(nn) \
|
| 563 |
|
|
mtfv_i = mtfv[gs+(nn)]; \
|
| 564 |
|
|
bsW ( s, \
|
| 565 |
|
|
s_len_sel_selCtr[mtfv_i], \
|
| 566 |
|
|
s_code_sel_selCtr[mtfv_i] )
|
| 567 |
|
|
|
| 568 |
|
|
BZ_ITAH(0); BZ_ITAH(1); BZ_ITAH(2); BZ_ITAH(3); BZ_ITAH(4);
|
| 569 |
|
|
BZ_ITAH(5); BZ_ITAH(6); BZ_ITAH(7); BZ_ITAH(8); BZ_ITAH(9);
|
| 570 |
|
|
BZ_ITAH(10); BZ_ITAH(11); BZ_ITAH(12); BZ_ITAH(13); BZ_ITAH(14);
|
| 571 |
|
|
BZ_ITAH(15); BZ_ITAH(16); BZ_ITAH(17); BZ_ITAH(18); BZ_ITAH(19);
|
| 572 |
|
|
BZ_ITAH(20); BZ_ITAH(21); BZ_ITAH(22); BZ_ITAH(23); BZ_ITAH(24);
|
| 573 |
|
|
BZ_ITAH(25); BZ_ITAH(26); BZ_ITAH(27); BZ_ITAH(28); BZ_ITAH(29);
|
| 574 |
|
|
BZ_ITAH(30); BZ_ITAH(31); BZ_ITAH(32); BZ_ITAH(33); BZ_ITAH(34);
|
| 575 |
|
|
BZ_ITAH(35); BZ_ITAH(36); BZ_ITAH(37); BZ_ITAH(38); BZ_ITAH(39);
|
| 576 |
|
|
BZ_ITAH(40); BZ_ITAH(41); BZ_ITAH(42); BZ_ITAH(43); BZ_ITAH(44);
|
| 577 |
|
|
BZ_ITAH(45); BZ_ITAH(46); BZ_ITAH(47); BZ_ITAH(48); BZ_ITAH(49);
|
| 578 |
|
|
|
| 579 |
|
|
# undef BZ_ITAH
|
| 580 |
|
|
|
| 581 |
|
|
} else {
|
| 582 |
|
|
/*--- slow version which correctly handles all situations ---*/
|
| 583 |
|
|
for (i = gs; i <= ge; i++) {
|
| 584 |
|
|
bsW ( s,
|
| 585 |
|
|
s->len [s->selector[selCtr]] [mtfv[i]],
|
| 586 |
|
|
s->code [s->selector[selCtr]] [mtfv[i]] );
|
| 587 |
|
|
}
|
| 588 |
|
|
}
|
| 589 |
|
|
|
| 590 |
|
|
|
| 591 |
|
|
gs = ge+1;
|
| 592 |
|
|
selCtr++;
|
| 593 |
|
|
}
|
| 594 |
|
|
AssertH( selCtr == nSelectors, 3007 );
|
| 595 |
|
|
|
| 596 |
|
|
if (s->verbosity >= 3)
|
| 597 |
|
|
VPrintf1( "codes %d\n", s->numZ-nBytes );
|
| 598 |
|
|
}
|
| 599 |
|
|
|
| 600 |
|
|
|
| 601 |
|
|
/*---------------------------------------------------*/
|
| 602 |
|
|
void BZ2_compressBlock ( EState* s, Bool is_last_block )
|
| 603 |
|
|
{
|
| 604 |
|
|
if (s->nblock > 0) {
|
| 605 |
|
|
|
| 606 |
|
|
BZ_FINALISE_CRC ( s->blockCRC );
|
| 607 |
|
|
s->combinedCRC = (s->combinedCRC << 1) | (s->combinedCRC >> 31);
|
| 608 |
|
|
s->combinedCRC ^= s->blockCRC;
|
| 609 |
|
|
if (s->blockNo > 1) s->numZ = 0;
|
| 610 |
|
|
|
| 611 |
|
|
if (s->verbosity >= 2)
|
| 612 |
|
|
VPrintf4( " block %d: crc = 0x%08x, "
|
| 613 |
|
|
"combined CRC = 0x%08x, size = %d\n",
|
| 614 |
|
|
s->blockNo, s->blockCRC, s->combinedCRC, s->nblock );
|
| 615 |
|
|
|
| 616 |
|
|
BZ2_blockSort ( s );
|
| 617 |
|
|
}
|
| 618 |
|
|
|
| 619 |
|
|
s->zbits = (UChar*) (&((UChar*)s->arr2)[s->nblock]);
|
| 620 |
|
|
|
| 621 |
|
|
/*-- If this is the first block, create the stream header. --*/
|
| 622 |
|
|
if (s->blockNo == 1) {
|
| 623 |
|
|
BZ2_bsInitWrite ( s );
|
| 624 |
|
|
bsPutUChar ( s, BZ_HDR_B );
|
| 625 |
|
|
bsPutUChar ( s, BZ_HDR_Z );
|
| 626 |
|
|
bsPutUChar ( s, BZ_HDR_h );
|
| 627 |
|
|
bsPutUChar ( s, (UChar)(BZ_HDR_0 + s->blockSize100k) );
|
| 628 |
|
|
}
|
| 629 |
|
|
|
| 630 |
|
|
if (s->nblock > 0) {
|
| 631 |
|
|
|
| 632 |
|
|
bsPutUChar ( s, 0x31 ); bsPutUChar ( s, 0x41 );
|
| 633 |
|
|
bsPutUChar ( s, 0x59 ); bsPutUChar ( s, 0x26 );
|
| 634 |
|
|
bsPutUChar ( s, 0x53 ); bsPutUChar ( s, 0x59 );
|
| 635 |
|
|
|
| 636 |
|
|
/*-- Now the block's CRC, so it is in a known place. --*/
|
| 637 |
|
|
bsPutUInt32 ( s, s->blockCRC );
|
| 638 |
|
|
|
| 639 |
|
|
/*--
|
| 640 |
|
|
Now a single bit indicating (non-)randomisation.
|
| 641 |
|
|
As of version 0.9.5, we use a better sorting algorithm
|
| 642 |
|
|
which makes randomisation unnecessary. So always set
|
| 643 |
|
|
the randomised bit to 'no'. Of course, the decoder
|
| 644 |
|
|
still needs to be able to handle randomised blocks
|
| 645 |
|
|
so as to maintain backwards compatibility with
|
| 646 |
|
|
older versions of bzip2.
|
| 647 |
|
|
--*/
|
| 648 |
|
|
bsW(s,1,0);
|
| 649 |
|
|
|
| 650 |
|
|
bsW ( s, 24, s->origPtr );
|
| 651 |
|
|
generateMTFValues ( s );
|
| 652 |
|
|
sendMTFValues ( s );
|
| 653 |
|
|
}
|
| 654 |
|
|
|
| 655 |
|
|
|
| 656 |
|
|
/*-- If this is the last block, add the stream trailer. --*/
|
| 657 |
|
|
if (is_last_block) {
|
| 658 |
|
|
|
| 659 |
|
|
bsPutUChar ( s, 0x17 ); bsPutUChar ( s, 0x72 );
|
| 660 |
|
|
bsPutUChar ( s, 0x45 ); bsPutUChar ( s, 0x38 );
|
| 661 |
|
|
bsPutUChar ( s, 0x50 ); bsPutUChar ( s, 0x90 );
|
| 662 |
|
|
bsPutUInt32 ( s, s->combinedCRC );
|
| 663 |
|
|
if (s->verbosity >= 2)
|
| 664 |
|
|
VPrintf1( " final combined CRC = 0x%08x\n ", s->combinedCRC );
|
| 665 |
|
|
bsFinishWrite ( s );
|
| 666 |
|
|
}
|
| 667 |
|
|
}
|
| 668 |
|
|
|
| 669 |
|
|
|
| 670 |
|
|
/*-------------------------------------------------------------*/
|
| 671 |
|
|
/*--- end compress.c ---*/
|
| 672 |
|
|
/*-------------------------------------------------------------*/
|
