| 1 |
loizides |
1.1 |
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| 2 |
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/*-------------------------------------------------------------*/
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/*--- Decompression machinery ---*/
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| 4 |
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/*--- decompress.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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#include "bzlib_private.h"
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| 25 |
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/*---------------------------------------------------*/
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static
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void makeMaps_d ( DState* s )
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| 28 |
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{
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| 29 |
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Int32 i;
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| 30 |
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s->nInUse = 0;
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| 31 |
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for (i = 0; i < 256; i++)
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| 32 |
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if (s->inUse[i]) {
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s->seqToUnseq[s->nInUse] = i;
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s->nInUse++;
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}
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}
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| 38 |
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| 39 |
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/*---------------------------------------------------*/
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#define RETURN(rrr) \
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{ retVal = rrr; goto save_state_and_return; };
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| 43 |
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#define GET_BITS(lll,vvv,nnn) \
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case lll: s->state = lll; \
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while (True) { \
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if (s->bsLive >= nnn) { \
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UInt32 v; \
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| 48 |
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v = (s->bsBuff >> \
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| 49 |
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(s->bsLive-nnn)) & ((1 << nnn)-1); \
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s->bsLive -= nnn; \
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vvv = v; \
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break; \
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| 53 |
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} \
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| 54 |
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if (s->strm->avail_in == 0) RETURN(BZ_OK); \
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| 55 |
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s->bsBuff \
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= (s->bsBuff << 8) | \
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| 57 |
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((UInt32) \
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| 58 |
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(*((UChar*)(s->strm->next_in)))); \
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| 59 |
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s->bsLive += 8; \
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| 60 |
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s->strm->next_in++; \
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s->strm->avail_in--; \
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| 62 |
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s->strm->total_in_lo32++; \
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if (s->strm->total_in_lo32 == 0) \
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| 64 |
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s->strm->total_in_hi32++; \
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}
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| 67 |
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#define GET_UCHAR(lll,uuu) \
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GET_BITS(lll,uuu,8)
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| 70 |
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#define GET_BIT(lll,uuu) \
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GET_BITS(lll,uuu,1)
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/*---------------------------------------------------*/
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#define GET_MTF_VAL(label1,label2,lval) \
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{ \
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| 76 |
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if (groupPos == 0) { \
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| 77 |
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groupNo++; \
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| 78 |
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if (groupNo >= nSelectors) \
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| 79 |
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RETURN(BZ_DATA_ERROR); \
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| 80 |
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groupPos = BZ_G_SIZE; \
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| 81 |
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gSel = s->selector[groupNo]; \
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| 82 |
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gMinlen = s->minLens[gSel]; \
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gLimit = &(s->limit[gSel][0]); \
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gPerm = &(s->perm[gSel][0]); \
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gBase = &(s->base[gSel][0]); \
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| 86 |
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} \
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| 87 |
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groupPos--; \
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| 88 |
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zn = gMinlen; \
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| 89 |
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GET_BITS(label1, zvec, zn); \
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| 90 |
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while (1) { \
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if (zn > 20 /* the longest code */) \
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RETURN(BZ_DATA_ERROR); \
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| 93 |
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if (zvec <= gLimit[zn]) break; \
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zn++; \
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GET_BIT(label2, zj); \
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zvec = (zvec << 1) | zj; \
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| 97 |
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}; \
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| 98 |
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if (zvec - gBase[zn] < 0 \
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| 99 |
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|| zvec - gBase[zn] >= BZ_MAX_ALPHA_SIZE) \
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| 100 |
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RETURN(BZ_DATA_ERROR); \
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| 101 |
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lval = gPerm[zvec - gBase[zn]]; \
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| 102 |
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}
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| 103 |
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| 104 |
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| 105 |
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/*---------------------------------------------------*/
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| 106 |
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Int32 BZ2_decompress ( DState* s )
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| 107 |
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{
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| 108 |
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UChar uc;
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| 109 |
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Int32 retVal;
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| 110 |
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Int32 minLen, maxLen;
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| 111 |
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bz_stream* strm = s->strm;
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| 113 |
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/* stuff that needs to be saved/restored */
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| 114 |
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Int32 i;
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| 115 |
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Int32 j;
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| 116 |
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Int32 t;
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| 117 |
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Int32 alphaSize;
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| 118 |
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Int32 nGroups;
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| 119 |
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Int32 nSelectors;
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| 120 |
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Int32 EOB;
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| 121 |
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Int32 groupNo;
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| 122 |
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Int32 groupPos;
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| 123 |
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Int32 nextSym;
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| 124 |
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Int32 nblockMAX;
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| 125 |
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Int32 nblock;
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| 126 |
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Int32 es;
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| 127 |
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Int32 N;
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| 128 |
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Int32 curr;
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| 129 |
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Int32 zt;
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| 130 |
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Int32 zn;
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| 131 |
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Int32 zvec;
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| 132 |
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Int32 zj;
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| 133 |
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Int32 gSel;
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| 134 |
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Int32 gMinlen;
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| 135 |
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Int32* gLimit;
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| 136 |
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Int32* gBase;
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| 137 |
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Int32* gPerm;
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| 138 |
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| 139 |
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if (s->state == BZ_X_MAGIC_1) {
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| 140 |
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/*initialise the save area*/
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| 141 |
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s->save_i = 0;
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| 142 |
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s->save_j = 0;
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| 143 |
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s->save_t = 0;
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| 144 |
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s->save_alphaSize = 0;
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| 145 |
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s->save_nGroups = 0;
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| 146 |
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s->save_nSelectors = 0;
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| 147 |
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s->save_EOB = 0;
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| 148 |
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s->save_groupNo = 0;
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| 149 |
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s->save_groupPos = 0;
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| 150 |
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s->save_nextSym = 0;
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| 151 |
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s->save_nblockMAX = 0;
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| 152 |
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s->save_nblock = 0;
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| 153 |
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s->save_es = 0;
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| 154 |
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s->save_N = 0;
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| 155 |
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s->save_curr = 0;
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| 156 |
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s->save_zt = 0;
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| 157 |
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s->save_zn = 0;
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| 158 |
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s->save_zvec = 0;
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| 159 |
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s->save_zj = 0;
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| 160 |
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s->save_gSel = 0;
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| 161 |
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s->save_gMinlen = 0;
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| 162 |
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s->save_gLimit = NULL;
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| 163 |
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s->save_gBase = NULL;
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| 164 |
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s->save_gPerm = NULL;
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| 165 |
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}
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| 166 |
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| 167 |
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/*restore from the save area*/
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| 168 |
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i = s->save_i;
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| 169 |
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j = s->save_j;
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| 170 |
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t = s->save_t;
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| 171 |
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alphaSize = s->save_alphaSize;
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| 172 |
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nGroups = s->save_nGroups;
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| 173 |
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nSelectors = s->save_nSelectors;
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| 174 |
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EOB = s->save_EOB;
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| 175 |
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groupNo = s->save_groupNo;
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groupPos = s->save_groupPos;
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| 177 |
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nextSym = s->save_nextSym;
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| 178 |
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nblockMAX = s->save_nblockMAX;
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| 179 |
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nblock = s->save_nblock;
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| 180 |
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es = s->save_es;
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| 181 |
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N = s->save_N;
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| 182 |
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curr = s->save_curr;
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| 183 |
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zt = s->save_zt;
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| 184 |
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zn = s->save_zn;
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| 185 |
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zvec = s->save_zvec;
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| 186 |
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zj = s->save_zj;
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| 187 |
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gSel = s->save_gSel;
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| 188 |
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gMinlen = s->save_gMinlen;
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| 189 |
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gLimit = s->save_gLimit;
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| 190 |
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gBase = s->save_gBase;
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| 191 |
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gPerm = s->save_gPerm;
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| 192 |
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| 193 |
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retVal = BZ_OK;
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| 194 |
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| 195 |
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switch (s->state) {
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| 196 |
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| 197 |
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GET_UCHAR(BZ_X_MAGIC_1, uc);
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| 198 |
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if (uc != BZ_HDR_B) RETURN(BZ_DATA_ERROR_MAGIC);
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| 199 |
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| 200 |
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GET_UCHAR(BZ_X_MAGIC_2, uc);
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| 201 |
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if (uc != BZ_HDR_Z) RETURN(BZ_DATA_ERROR_MAGIC);
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| 202 |
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| 203 |
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GET_UCHAR(BZ_X_MAGIC_3, uc)
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| 204 |
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if (uc != BZ_HDR_h) RETURN(BZ_DATA_ERROR_MAGIC);
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| 205 |
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| 206 |
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GET_BITS(BZ_X_MAGIC_4, s->blockSize100k, 8)
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| 207 |
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if (s->blockSize100k < (BZ_HDR_0 + 1) ||
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| 208 |
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s->blockSize100k > (BZ_HDR_0 + 9)) RETURN(BZ_DATA_ERROR_MAGIC);
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| 209 |
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s->blockSize100k -= BZ_HDR_0;
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| 210 |
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| 211 |
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if (s->smallDecompress) {
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| 212 |
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s->ll16 = BZALLOC( s->blockSize100k * 100000 * sizeof(UInt16) );
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| 213 |
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s->ll4 = BZALLOC(
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| 214 |
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((1 + s->blockSize100k * 100000) >> 1) * sizeof(UChar)
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| 215 |
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);
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| 216 |
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if (s->ll16 == NULL || s->ll4 == NULL) RETURN(BZ_MEM_ERROR);
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| 217 |
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} else {
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| 218 |
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s->tt = BZALLOC( s->blockSize100k * 100000 * sizeof(Int32) );
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| 219 |
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if (s->tt == NULL) RETURN(BZ_MEM_ERROR);
|
| 220 |
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}
|
| 221 |
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| 222 |
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GET_UCHAR(BZ_X_BLKHDR_1, uc);
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| 223 |
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| 224 |
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if (uc == 0x17) goto endhdr_2;
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| 225 |
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if (uc != 0x31) RETURN(BZ_DATA_ERROR);
|
| 226 |
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GET_UCHAR(BZ_X_BLKHDR_2, uc);
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| 227 |
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if (uc != 0x41) RETURN(BZ_DATA_ERROR);
|
| 228 |
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GET_UCHAR(BZ_X_BLKHDR_3, uc);
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| 229 |
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if (uc != 0x59) RETURN(BZ_DATA_ERROR);
|
| 230 |
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GET_UCHAR(BZ_X_BLKHDR_4, uc);
|
| 231 |
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if (uc != 0x26) RETURN(BZ_DATA_ERROR);
|
| 232 |
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GET_UCHAR(BZ_X_BLKHDR_5, uc);
|
| 233 |
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if (uc != 0x53) RETURN(BZ_DATA_ERROR);
|
| 234 |
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GET_UCHAR(BZ_X_BLKHDR_6, uc);
|
| 235 |
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if (uc != 0x59) RETURN(BZ_DATA_ERROR);
|
| 236 |
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|
| 237 |
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s->currBlockNo++;
|
| 238 |
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if (s->verbosity >= 2)
|
| 239 |
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VPrintf1 ( "\n [%d: huff+mtf ", s->currBlockNo );
|
| 240 |
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|
| 241 |
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s->storedBlockCRC = 0;
|
| 242 |
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GET_UCHAR(BZ_X_BCRC_1, uc);
|
| 243 |
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s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
|
| 244 |
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GET_UCHAR(BZ_X_BCRC_2, uc);
|
| 245 |
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s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
|
| 246 |
|
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GET_UCHAR(BZ_X_BCRC_3, uc);
|
| 247 |
|
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s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
|
| 248 |
|
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GET_UCHAR(BZ_X_BCRC_4, uc);
|
| 249 |
|
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s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
|
| 250 |
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| 251 |
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GET_BITS(BZ_X_RANDBIT, s->blockRandomised, 1);
|
| 252 |
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|
| 253 |
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s->origPtr = 0;
|
| 254 |
|
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GET_UCHAR(BZ_X_ORIGPTR_1, uc);
|
| 255 |
|
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s->origPtr = (s->origPtr << 8) | ((Int32)uc);
|
| 256 |
|
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GET_UCHAR(BZ_X_ORIGPTR_2, uc);
|
| 257 |
|
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s->origPtr = (s->origPtr << 8) | ((Int32)uc);
|
| 258 |
|
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GET_UCHAR(BZ_X_ORIGPTR_3, uc);
|
| 259 |
|
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s->origPtr = (s->origPtr << 8) | ((Int32)uc);
|
| 260 |
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|
|
| 261 |
|
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if (s->origPtr < 0)
|
| 262 |
|
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RETURN(BZ_DATA_ERROR);
|
| 263 |
|
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if (s->origPtr > 10 + 100000*s->blockSize100k)
|
| 264 |
|
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RETURN(BZ_DATA_ERROR);
|
| 265 |
|
|
|
| 266 |
|
|
/*--- Receive the mapping table ---*/
|
| 267 |
|
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for (i = 0; i < 16; i++) {
|
| 268 |
|
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GET_BIT(BZ_X_MAPPING_1, uc);
|
| 269 |
|
|
if (uc == 1)
|
| 270 |
|
|
s->inUse16[i] = True; else
|
| 271 |
|
|
s->inUse16[i] = False;
|
| 272 |
|
|
}
|
| 273 |
|
|
|
| 274 |
|
|
for (i = 0; i < 256; i++) s->inUse[i] = False;
|
| 275 |
|
|
|
| 276 |
|
|
for (i = 0; i < 16; i++)
|
| 277 |
|
|
if (s->inUse16[i])
|
| 278 |
|
|
for (j = 0; j < 16; j++) {
|
| 279 |
|
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GET_BIT(BZ_X_MAPPING_2, uc);
|
| 280 |
|
|
if (uc == 1) s->inUse[i * 16 + j] = True;
|
| 281 |
|
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}
|
| 282 |
|
|
makeMaps_d ( s );
|
| 283 |
|
|
if (s->nInUse == 0) RETURN(BZ_DATA_ERROR);
|
| 284 |
|
|
alphaSize = s->nInUse+2;
|
| 285 |
|
|
|
| 286 |
|
|
/*--- Now the selectors ---*/
|
| 287 |
|
|
GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
|
| 288 |
|
|
if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
|
| 289 |
|
|
GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
|
| 290 |
|
|
if (nSelectors < 1) RETURN(BZ_DATA_ERROR);
|
| 291 |
|
|
for (i = 0; i < nSelectors; i++) {
|
| 292 |
|
|
j = 0;
|
| 293 |
|
|
while (True) {
|
| 294 |
|
|
GET_BIT(BZ_X_SELECTOR_3, uc);
|
| 295 |
|
|
if (uc == 0) break;
|
| 296 |
|
|
j++;
|
| 297 |
|
|
if (j >= nGroups) RETURN(BZ_DATA_ERROR);
|
| 298 |
|
|
}
|
| 299 |
|
|
s->selectorMtf[i] = j;
|
| 300 |
|
|
}
|
| 301 |
|
|
|
| 302 |
|
|
/*--- Undo the MTF values for the selectors. ---*/
|
| 303 |
|
|
{
|
| 304 |
|
|
UChar pos[BZ_N_GROUPS], tmp, v;
|
| 305 |
|
|
for (v = 0; v < nGroups; v++) pos[v] = v;
|
| 306 |
|
|
|
| 307 |
|
|
for (i = 0; i < nSelectors; i++) {
|
| 308 |
|
|
v = s->selectorMtf[i];
|
| 309 |
|
|
tmp = pos[v];
|
| 310 |
|
|
while (v > 0) { pos[v] = pos[v-1]; v--; }
|
| 311 |
|
|
pos[0] = tmp;
|
| 312 |
|
|
s->selector[i] = tmp;
|
| 313 |
|
|
}
|
| 314 |
|
|
}
|
| 315 |
|
|
|
| 316 |
|
|
/*--- Now the coding tables ---*/
|
| 317 |
|
|
for (t = 0; t < nGroups; t++) {
|
| 318 |
|
|
GET_BITS(BZ_X_CODING_1, curr, 5);
|
| 319 |
|
|
for (i = 0; i < alphaSize; i++) {
|
| 320 |
|
|
while (True) {
|
| 321 |
|
|
if (curr < 1 || curr > 20) RETURN(BZ_DATA_ERROR);
|
| 322 |
|
|
GET_BIT(BZ_X_CODING_2, uc);
|
| 323 |
|
|
if (uc == 0) break;
|
| 324 |
|
|
GET_BIT(BZ_X_CODING_3, uc);
|
| 325 |
|
|
if (uc == 0) curr++; else curr--;
|
| 326 |
|
|
}
|
| 327 |
|
|
s->len[t][i] = curr;
|
| 328 |
|
|
}
|
| 329 |
|
|
}
|
| 330 |
|
|
|
| 331 |
|
|
/*--- Create the Huffman decoding tables ---*/
|
| 332 |
|
|
for (t = 0; t < nGroups; t++) {
|
| 333 |
|
|
minLen = 32;
|
| 334 |
|
|
maxLen = 0;
|
| 335 |
|
|
for (i = 0; i < alphaSize; i++) {
|
| 336 |
|
|
if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
|
| 337 |
|
|
if (s->len[t][i] < minLen) minLen = s->len[t][i];
|
| 338 |
|
|
}
|
| 339 |
|
|
BZ2_hbCreateDecodeTables (
|
| 340 |
|
|
&(s->limit[t][0]),
|
| 341 |
|
|
&(s->base[t][0]),
|
| 342 |
|
|
&(s->perm[t][0]),
|
| 343 |
|
|
&(s->len[t][0]),
|
| 344 |
|
|
minLen, maxLen, alphaSize
|
| 345 |
|
|
);
|
| 346 |
|
|
s->minLens[t] = minLen;
|
| 347 |
|
|
}
|
| 348 |
|
|
|
| 349 |
|
|
/*--- Now the MTF values ---*/
|
| 350 |
|
|
|
| 351 |
|
|
EOB = s->nInUse+1;
|
| 352 |
|
|
nblockMAX = 100000 * s->blockSize100k;
|
| 353 |
|
|
groupNo = -1;
|
| 354 |
|
|
groupPos = 0;
|
| 355 |
|
|
|
| 356 |
|
|
for (i = 0; i <= 255; i++) s->unzftab[i] = 0;
|
| 357 |
|
|
|
| 358 |
|
|
/*-- MTF init --*/
|
| 359 |
|
|
{
|
| 360 |
|
|
Int32 ii, jj, kk;
|
| 361 |
|
|
kk = MTFA_SIZE-1;
|
| 362 |
|
|
for (ii = 256 / MTFL_SIZE - 1; ii >= 0; ii--) {
|
| 363 |
|
|
for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
|
| 364 |
|
|
s->mtfa[kk] = (UChar)(ii * MTFL_SIZE + jj);
|
| 365 |
|
|
kk--;
|
| 366 |
|
|
}
|
| 367 |
|
|
s->mtfbase[ii] = kk + 1;
|
| 368 |
|
|
}
|
| 369 |
|
|
}
|
| 370 |
|
|
/*-- end MTF init --*/
|
| 371 |
|
|
|
| 372 |
|
|
nblock = 0;
|
| 373 |
|
|
GET_MTF_VAL(BZ_X_MTF_1, BZ_X_MTF_2, nextSym);
|
| 374 |
|
|
|
| 375 |
|
|
while (True) {
|
| 376 |
|
|
|
| 377 |
|
|
if (nextSym == EOB) break;
|
| 378 |
|
|
|
| 379 |
|
|
if (nextSym == BZ_RUNA || nextSym == BZ_RUNB) {
|
| 380 |
|
|
|
| 381 |
|
|
es = -1;
|
| 382 |
|
|
N = 1;
|
| 383 |
|
|
do {
|
| 384 |
|
|
if (nextSym == BZ_RUNA) es = es + (0+1) * N; else
|
| 385 |
|
|
if (nextSym == BZ_RUNB) es = es + (1+1) * N;
|
| 386 |
|
|
N = N * 2;
|
| 387 |
|
|
GET_MTF_VAL(BZ_X_MTF_3, BZ_X_MTF_4, nextSym);
|
| 388 |
|
|
}
|
| 389 |
|
|
while (nextSym == BZ_RUNA || nextSym == BZ_RUNB);
|
| 390 |
|
|
|
| 391 |
|
|
es++;
|
| 392 |
|
|
uc = s->seqToUnseq[ s->mtfa[s->mtfbase[0]] ];
|
| 393 |
|
|
s->unzftab[uc] += es;
|
| 394 |
|
|
|
| 395 |
|
|
if (s->smallDecompress)
|
| 396 |
|
|
while (es > 0) {
|
| 397 |
|
|
if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
|
| 398 |
|
|
s->ll16[nblock] = (UInt16)uc;
|
| 399 |
|
|
nblock++;
|
| 400 |
|
|
es--;
|
| 401 |
|
|
}
|
| 402 |
|
|
else
|
| 403 |
|
|
while (es > 0) {
|
| 404 |
|
|
if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
|
| 405 |
|
|
s->tt[nblock] = (UInt32)uc;
|
| 406 |
|
|
nblock++;
|
| 407 |
|
|
es--;
|
| 408 |
|
|
};
|
| 409 |
|
|
|
| 410 |
|
|
continue;
|
| 411 |
|
|
|
| 412 |
|
|
} else {
|
| 413 |
|
|
|
| 414 |
|
|
if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
|
| 415 |
|
|
|
| 416 |
|
|
/*-- uc = MTF ( nextSym-1 ) --*/
|
| 417 |
|
|
{
|
| 418 |
|
|
Int32 ii, jj, kk, pp, lno, off;
|
| 419 |
|
|
UInt32 nn;
|
| 420 |
|
|
nn = (UInt32)(nextSym - 1);
|
| 421 |
|
|
|
| 422 |
|
|
if (nn < MTFL_SIZE) {
|
| 423 |
|
|
/* avoid general-case expense */
|
| 424 |
|
|
pp = s->mtfbase[0];
|
| 425 |
|
|
uc = s->mtfa[pp+nn];
|
| 426 |
|
|
while (nn > 3) {
|
| 427 |
|
|
Int32 z = pp+nn;
|
| 428 |
|
|
s->mtfa[(z) ] = s->mtfa[(z)-1];
|
| 429 |
|
|
s->mtfa[(z)-1] = s->mtfa[(z)-2];
|
| 430 |
|
|
s->mtfa[(z)-2] = s->mtfa[(z)-3];
|
| 431 |
|
|
s->mtfa[(z)-3] = s->mtfa[(z)-4];
|
| 432 |
|
|
nn -= 4;
|
| 433 |
|
|
}
|
| 434 |
|
|
while (nn > 0) {
|
| 435 |
|
|
s->mtfa[(pp+nn)] = s->mtfa[(pp+nn)-1]; nn--;
|
| 436 |
|
|
};
|
| 437 |
|
|
s->mtfa[pp] = uc;
|
| 438 |
|
|
} else {
|
| 439 |
|
|
/* general case */
|
| 440 |
|
|
lno = nn / MTFL_SIZE;
|
| 441 |
|
|
off = nn % MTFL_SIZE;
|
| 442 |
|
|
pp = s->mtfbase[lno] + off;
|
| 443 |
|
|
uc = s->mtfa[pp];
|
| 444 |
|
|
while (pp > s->mtfbase[lno]) {
|
| 445 |
|
|
s->mtfa[pp] = s->mtfa[pp-1]; pp--;
|
| 446 |
|
|
};
|
| 447 |
|
|
s->mtfbase[lno]++;
|
| 448 |
|
|
while (lno > 0) {
|
| 449 |
|
|
s->mtfbase[lno]--;
|
| 450 |
|
|
s->mtfa[s->mtfbase[lno]]
|
| 451 |
|
|
= s->mtfa[s->mtfbase[lno-1] + MTFL_SIZE - 1];
|
| 452 |
|
|
lno--;
|
| 453 |
|
|
}
|
| 454 |
|
|
s->mtfbase[0]--;
|
| 455 |
|
|
s->mtfa[s->mtfbase[0]] = uc;
|
| 456 |
|
|
if (s->mtfbase[0] == 0) {
|
| 457 |
|
|
kk = MTFA_SIZE-1;
|
| 458 |
|
|
for (ii = 256 / MTFL_SIZE-1; ii >= 0; ii--) {
|
| 459 |
|
|
for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
|
| 460 |
|
|
s->mtfa[kk] = s->mtfa[s->mtfbase[ii] + jj];
|
| 461 |
|
|
kk--;
|
| 462 |
|
|
}
|
| 463 |
|
|
s->mtfbase[ii] = kk + 1;
|
| 464 |
|
|
}
|
| 465 |
|
|
}
|
| 466 |
|
|
}
|
| 467 |
|
|
}
|
| 468 |
|
|
/*-- end uc = MTF ( nextSym-1 ) --*/
|
| 469 |
|
|
|
| 470 |
|
|
s->unzftab[s->seqToUnseq[uc]]++;
|
| 471 |
|
|
if (s->smallDecompress)
|
| 472 |
|
|
s->ll16[nblock] = (UInt16)(s->seqToUnseq[uc]); else
|
| 473 |
|
|
s->tt[nblock] = (UInt32)(s->seqToUnseq[uc]);
|
| 474 |
|
|
nblock++;
|
| 475 |
|
|
|
| 476 |
|
|
GET_MTF_VAL(BZ_X_MTF_5, BZ_X_MTF_6, nextSym);
|
| 477 |
|
|
continue;
|
| 478 |
|
|
}
|
| 479 |
|
|
}
|
| 480 |
|
|
|
| 481 |
|
|
/* Now we know what nblock is, we can do a better sanity
|
| 482 |
|
|
check on s->origPtr.
|
| 483 |
|
|
*/
|
| 484 |
|
|
if (s->origPtr < 0 || s->origPtr >= nblock)
|
| 485 |
|
|
RETURN(BZ_DATA_ERROR);
|
| 486 |
|
|
|
| 487 |
|
|
/*-- Set up cftab to facilitate generation of T^(-1) --*/
|
| 488 |
|
|
s->cftab[0] = 0;
|
| 489 |
|
|
for (i = 1; i <= 256; i++) s->cftab[i] = s->unzftab[i-1];
|
| 490 |
|
|
for (i = 1; i <= 256; i++) s->cftab[i] += s->cftab[i-1];
|
| 491 |
|
|
for (i = 0; i <= 256; i++) {
|
| 492 |
|
|
if (s->cftab[i] < 0 || s->cftab[i] > nblock) {
|
| 493 |
|
|
/* s->cftab[i] can legitimately be == nblock */
|
| 494 |
|
|
RETURN(BZ_DATA_ERROR);
|
| 495 |
|
|
}
|
| 496 |
|
|
}
|
| 497 |
|
|
|
| 498 |
|
|
s->state_out_len = 0;
|
| 499 |
|
|
s->state_out_ch = 0;
|
| 500 |
|
|
BZ_INITIALISE_CRC ( s->calculatedBlockCRC );
|
| 501 |
|
|
s->state = BZ_X_OUTPUT;
|
| 502 |
|
|
if (s->verbosity >= 2) VPrintf0 ( "rt+rld" );
|
| 503 |
|
|
|
| 504 |
|
|
if (s->smallDecompress) {
|
| 505 |
|
|
|
| 506 |
|
|
/*-- Make a copy of cftab, used in generation of T --*/
|
| 507 |
|
|
for (i = 0; i <= 256; i++) s->cftabCopy[i] = s->cftab[i];
|
| 508 |
|
|
|
| 509 |
|
|
/*-- compute the T vector --*/
|
| 510 |
|
|
for (i = 0; i < nblock; i++) {
|
| 511 |
|
|
uc = (UChar)(s->ll16[i]);
|
| 512 |
|
|
SET_LL(i, s->cftabCopy[uc]);
|
| 513 |
|
|
s->cftabCopy[uc]++;
|
| 514 |
|
|
}
|
| 515 |
|
|
|
| 516 |
|
|
/*-- Compute T^(-1) by pointer reversal on T --*/
|
| 517 |
|
|
i = s->origPtr;
|
| 518 |
|
|
j = GET_LL(i);
|
| 519 |
|
|
do {
|
| 520 |
|
|
Int32 tmp = GET_LL(j);
|
| 521 |
|
|
SET_LL(j, i);
|
| 522 |
|
|
i = j;
|
| 523 |
|
|
j = tmp;
|
| 524 |
|
|
}
|
| 525 |
|
|
while (i != s->origPtr);
|
| 526 |
|
|
|
| 527 |
|
|
s->tPos = s->origPtr;
|
| 528 |
|
|
s->nblock_used = 0;
|
| 529 |
|
|
if (s->blockRandomised) {
|
| 530 |
|
|
BZ_RAND_INIT_MASK;
|
| 531 |
|
|
BZ_GET_SMALL(s->k0); s->nblock_used++;
|
| 532 |
|
|
BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK;
|
| 533 |
|
|
} else {
|
| 534 |
|
|
BZ_GET_SMALL(s->k0); s->nblock_used++;
|
| 535 |
|
|
}
|
| 536 |
|
|
|
| 537 |
|
|
} else {
|
| 538 |
|
|
|
| 539 |
|
|
/*-- compute the T^(-1) vector --*/
|
| 540 |
|
|
for (i = 0; i < nblock; i++) {
|
| 541 |
|
|
uc = (UChar)(s->tt[i] & 0xff);
|
| 542 |
|
|
s->tt[s->cftab[uc]] |= (i << 8);
|
| 543 |
|
|
s->cftab[uc]++;
|
| 544 |
|
|
}
|
| 545 |
|
|
|
| 546 |
|
|
s->tPos = s->tt[s->origPtr] >> 8;
|
| 547 |
|
|
s->nblock_used = 0;
|
| 548 |
|
|
if (s->blockRandomised) {
|
| 549 |
|
|
BZ_RAND_INIT_MASK;
|
| 550 |
|
|
BZ_GET_FAST(s->k0); s->nblock_used++;
|
| 551 |
|
|
BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK;
|
| 552 |
|
|
} else {
|
| 553 |
|
|
BZ_GET_FAST(s->k0); s->nblock_used++;
|
| 554 |
|
|
}
|
| 555 |
|
|
|
| 556 |
|
|
}
|
| 557 |
|
|
|
| 558 |
|
|
RETURN(BZ_OK);
|
| 559 |
|
|
|
| 560 |
|
|
|
| 561 |
|
|
|
| 562 |
|
|
endhdr_2:
|
| 563 |
|
|
|
| 564 |
|
|
GET_UCHAR(BZ_X_ENDHDR_2, uc);
|
| 565 |
|
|
if (uc != 0x72) RETURN(BZ_DATA_ERROR);
|
| 566 |
|
|
GET_UCHAR(BZ_X_ENDHDR_3, uc);
|
| 567 |
|
|
if (uc != 0x45) RETURN(BZ_DATA_ERROR);
|
| 568 |
|
|
GET_UCHAR(BZ_X_ENDHDR_4, uc);
|
| 569 |
|
|
if (uc != 0x38) RETURN(BZ_DATA_ERROR);
|
| 570 |
|
|
GET_UCHAR(BZ_X_ENDHDR_5, uc);
|
| 571 |
|
|
if (uc != 0x50) RETURN(BZ_DATA_ERROR);
|
| 572 |
|
|
GET_UCHAR(BZ_X_ENDHDR_6, uc);
|
| 573 |
|
|
if (uc != 0x90) RETURN(BZ_DATA_ERROR);
|
| 574 |
|
|
|
| 575 |
|
|
s->storedCombinedCRC = 0;
|
| 576 |
|
|
GET_UCHAR(BZ_X_CCRC_1, uc);
|
| 577 |
|
|
s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
|
| 578 |
|
|
GET_UCHAR(BZ_X_CCRC_2, uc);
|
| 579 |
|
|
s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
|
| 580 |
|
|
GET_UCHAR(BZ_X_CCRC_3, uc);
|
| 581 |
|
|
s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
|
| 582 |
|
|
GET_UCHAR(BZ_X_CCRC_4, uc);
|
| 583 |
|
|
s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
|
| 584 |
|
|
|
| 585 |
|
|
s->state = BZ_X_IDLE;
|
| 586 |
|
|
RETURN(BZ_STREAM_END);
|
| 587 |
|
|
|
| 588 |
|
|
default: AssertH ( False, 4001 );
|
| 589 |
|
|
}
|
| 590 |
|
|
|
| 591 |
|
|
AssertH ( False, 4002 );
|
| 592 |
|
|
|
| 593 |
|
|
save_state_and_return:
|
| 594 |
|
|
|
| 595 |
|
|
s->save_i = i;
|
| 596 |
|
|
s->save_j = j;
|
| 597 |
|
|
s->save_t = t;
|
| 598 |
|
|
s->save_alphaSize = alphaSize;
|
| 599 |
|
|
s->save_nGroups = nGroups;
|
| 600 |
|
|
s->save_nSelectors = nSelectors;
|
| 601 |
|
|
s->save_EOB = EOB;
|
| 602 |
|
|
s->save_groupNo = groupNo;
|
| 603 |
|
|
s->save_groupPos = groupPos;
|
| 604 |
|
|
s->save_nextSym = nextSym;
|
| 605 |
|
|
s->save_nblockMAX = nblockMAX;
|
| 606 |
|
|
s->save_nblock = nblock;
|
| 607 |
|
|
s->save_es = es;
|
| 608 |
|
|
s->save_N = N;
|
| 609 |
|
|
s->save_curr = curr;
|
| 610 |
|
|
s->save_zt = zt;
|
| 611 |
|
|
s->save_zn = zn;
|
| 612 |
|
|
s->save_zvec = zvec;
|
| 613 |
|
|
s->save_zj = zj;
|
| 614 |
|
|
s->save_gSel = gSel;
|
| 615 |
|
|
s->save_gMinlen = gMinlen;
|
| 616 |
|
|
s->save_gLimit = gLimit;
|
| 617 |
|
|
s->save_gBase = gBase;
|
| 618 |
|
|
s->save_gPerm = gPerm;
|
| 619 |
|
|
|
| 620 |
|
|
return retVal;
|
| 621 |
|
|
}
|
| 622 |
|
|
|
| 623 |
|
|
|
| 624 |
|
|
/*-------------------------------------------------------------*/
|
| 625 |
|
|
/*--- end decompress.c ---*/
|
| 626 |
|
|
/*-------------------------------------------------------------*/
|
