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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 23 | h266 | 1 | |
| 2 | /*-------------------------------------------------------------*/ |
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| 3 | /*--- Decompression machinery ---*/ |
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| 4 | /*--- decompress.c ---*/ |
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| 5 | /*-------------------------------------------------------------*/ |
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| 6 | |||
| 7 | /* ------------------------------------------------------------------ |
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| 8 | This file is part of bzip2/libbzip2, a program and library for |
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| 9 | lossless, block-sorting data compression. |
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| 10 | |||
| 11 | bzip2/libbzip2 version 1.0.4 of 20 December 2006 |
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| 12 | Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org> |
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| 13 | |||
| 14 | Please read the WARNING, DISCLAIMER and PATENTS sections in the |
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| 15 | README file. |
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| 16 | |||
| 17 | This program is released under the terms of the license contained |
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| 18 | in the file LICENSE. |
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| 19 | ------------------------------------------------------------------ */ |
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| 20 | |||
| 21 | |||
| 22 | #include "bzlib_private.h" |
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| 23 | |||
| 24 | |||
| 25 | /*---------------------------------------------------*/ |
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| 26 | static |
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| 27 | void makeMaps_d ( DState* s ) |
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| 28 | { |
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| 29 | Int32 i; |
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| 30 | s->nInUse = 0; |
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| 31 | for (i = 0; i < 256; i++) |
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| 32 | if (s->inUse[i]) { |
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| 33 | s->seqToUnseq[s->nInUse] = i; |
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| 34 | s->nInUse++; |
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| 35 | } |
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| 36 | } |
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| 37 | |||
| 38 | |||
| 39 | /*---------------------------------------------------*/ |
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| 40 | #define RETURN(rrr) \ |
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| 41 | { retVal = rrr; goto save_state_and_return; }; |
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| 42 | |||
| 43 | #define GET_BITS(lll,vvv,nnn) \ |
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| 44 | case lll: s->state = lll; \ |
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| 45 | while (True) { \ |
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| 46 | if (s->bsLive >= nnn) { \ |
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| 47 | UInt32 v; \ |
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| 48 | v = (s->bsBuff >> \ |
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| 49 | (s->bsLive-nnn)) & ((1 << nnn)-1); \ |
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| 50 | s->bsLive -= nnn; \ |
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| 51 | vvv = v; \ |
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| 52 | break; \ |
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| 53 | } \ |
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| 54 | if (s->strm->avail_in == 0) RETURN(BZ_OK); \ |
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| 55 | s->bsBuff \ |
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| 56 | = (s->bsBuff << 8) | \ |
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| 57 | ((UInt32) \ |
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| 58 | (*((UChar*)(s->strm->next_in)))); \ |
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| 59 | s->bsLive += 8; \ |
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| 60 | s->strm->next_in++; \ |
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| 61 | s->strm->avail_in--; \ |
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| 62 | s->strm->total_in_lo32++; \ |
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| 63 | if (s->strm->total_in_lo32 == 0) \ |
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| 64 | s->strm->total_in_hi32++; \ |
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| 65 | } |
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| 66 | |||
| 67 | #define GET_UCHAR(lll,uuu) \ |
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| 68 | GET_BITS(lll,uuu,8) |
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| 69 | |||
| 70 | #define GET_BIT(lll,uuu) \ |
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| 71 | GET_BITS(lll,uuu,1) |
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| 72 | |||
| 73 | /*---------------------------------------------------*/ |
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| 74 | #define GET_MTF_VAL(label1,label2,lval) \ |
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| 75 | { \ |
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| 76 | if (groupPos == 0) { \ |
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| 77 | groupNo++; \ |
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| 78 | if (groupNo >= nSelectors) \ |
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| 79 | RETURN(BZ_DATA_ERROR); \ |
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| 80 | groupPos = BZ_G_SIZE; \ |
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| 81 | gSel = s->selector[groupNo]; \ |
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| 82 | gMinlen = s->minLens[gSel]; \ |
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| 83 | gLimit = &(s->limit[gSel][0]); \ |
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| 84 | gPerm = &(s->perm[gSel][0]); \ |
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| 85 | gBase = &(s->base[gSel][0]); \ |
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| 86 | } \ |
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| 87 | groupPos--; \ |
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| 88 | zn = gMinlen; \ |
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| 89 | GET_BITS(label1, zvec, zn); \ |
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| 90 | while (1) { \ |
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| 91 | if (zn > 20 /* the longest code */) \ |
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| 92 | RETURN(BZ_DATA_ERROR); \ |
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| 93 | if (zvec <= gLimit[zn]) break; \ |
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| 94 | zn++; \ |
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| 95 | GET_BIT(label2, zj); \ |
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| 96 | zvec = (zvec << 1) | zj; \ |
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| 97 | }; \ |
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| 98 | if (zvec - gBase[zn] < 0 \ |
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| 99 | || zvec - gBase[zn] >= BZ_MAX_ALPHA_SIZE) \ |
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| 100 | RETURN(BZ_DATA_ERROR); \ |
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| 101 | lval = gPerm[zvec - gBase[zn]]; \ |
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| 102 | } |
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| 103 | |||
| 104 | |||
| 105 | /*---------------------------------------------------*/ |
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| 106 | Int32 BZ2_decompress ( DState* s ) |
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| 107 | { |
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| 108 | UChar uc; |
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| 109 | Int32 retVal; |
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| 110 | Int32 minLen, maxLen; |
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| 111 | bz_stream* strm = s->strm; |
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| 112 | |||
| 113 | /* stuff that needs to be saved/restored */ |
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| 114 | Int32 i; |
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| 115 | Int32 j; |
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| 116 | Int32 t; |
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| 117 | Int32 alphaSize; |
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| 118 | Int32 nGroups; |
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| 119 | Int32 nSelectors; |
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| 120 | Int32 EOB; |
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| 121 | Int32 groupNo; |
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| 122 | Int32 groupPos; |
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| 123 | Int32 nextSym; |
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| 124 | Int32 nblockMAX; |
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| 125 | Int32 nblock; |
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| 126 | Int32 es; |
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| 127 | Int32 N; |
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| 128 | Int32 curr; |
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| 129 | Int32 zt; |
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| 130 | Int32 zn; |
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| 131 | Int32 zvec; |
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| 132 | Int32 zj; |
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| 133 | Int32 gSel; |
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| 134 | Int32 gMinlen; |
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| 135 | Int32* gLimit; |
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| 136 | Int32* gBase; |
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| 137 | Int32* gPerm; |
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| 138 | |||
| 139 | if (s->state == BZ_X_MAGIC_1) { |
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| 140 | /*initialise the save area*/ |
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| 141 | s->save_i = 0; |
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| 142 | s->save_j = 0; |
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| 143 | s->save_t = 0; |
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| 144 | s->save_alphaSize = 0; |
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| 145 | s->save_nGroups = 0; |
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| 146 | s->save_nSelectors = 0; |
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| 147 | s->save_EOB = 0; |
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| 148 | s->save_groupNo = 0; |
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| 149 | s->save_groupPos = 0; |
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| 150 | s->save_nextSym = 0; |
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| 151 | s->save_nblockMAX = 0; |
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| 152 | s->save_nblock = 0; |
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| 153 | s->save_es = 0; |
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| 154 | s->save_N = 0; |
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| 155 | s->save_curr = 0; |
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| 156 | s->save_zt = 0; |
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| 157 | s->save_zn = 0; |
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| 158 | s->save_zvec = 0; |
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| 159 | s->save_zj = 0; |
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| 160 | s->save_gSel = 0; |
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| 161 | s->save_gMinlen = 0; |
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| 162 | s->save_gLimit = NULL; |
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| 163 | s->save_gBase = NULL; |
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| 164 | s->save_gPerm = NULL; |
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| 165 | } |
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| 166 | |||
| 167 | /*restore from the save area*/ |
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| 168 | i = s->save_i; |
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| 169 | j = s->save_j; |
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| 170 | t = s->save_t; |
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| 171 | alphaSize = s->save_alphaSize; |
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| 172 | nGroups = s->save_nGroups; |
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| 173 | nSelectors = s->save_nSelectors; |
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| 174 | EOB = s->save_EOB; |
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| 175 | groupNo = s->save_groupNo; |
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| 176 | groupPos = s->save_groupPos; |
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| 177 | nextSym = s->save_nextSym; |
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| 178 | nblockMAX = s->save_nblockMAX; |
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| 179 | nblock = s->save_nblock; |
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| 180 | es = s->save_es; |
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| 181 | N = s->save_N; |
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| 182 | curr = s->save_curr; |
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| 183 | zt = s->save_zt; |
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| 184 | zn = s->save_zn; |
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| 185 | zvec = s->save_zvec; |
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| 186 | zj = s->save_zj; |
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| 187 | gSel = s->save_gSel; |
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| 188 | gMinlen = s->save_gMinlen; |
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| 189 | gLimit = s->save_gLimit; |
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| 190 | gBase = s->save_gBase; |
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| 191 | gPerm = s->save_gPerm; |
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| 192 | |||
| 193 | retVal = BZ_OK; |
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| 194 | |||
| 195 | switch (s->state) { |
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| 196 | |||
| 197 | GET_UCHAR(BZ_X_MAGIC_1, uc); |
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| 198 | if (uc != BZ_HDR_B) RETURN(BZ_DATA_ERROR_MAGIC); |
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| 199 | |||
| 200 | GET_UCHAR(BZ_X_MAGIC_2, uc); |
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| 201 | if (uc != BZ_HDR_Z) RETURN(BZ_DATA_ERROR_MAGIC); |
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| 202 | |||
| 203 | GET_UCHAR(BZ_X_MAGIC_3, uc) |
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| 204 | if (uc != BZ_HDR_h) RETURN(BZ_DATA_ERROR_MAGIC); |
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| 205 | |||
| 206 | GET_BITS(BZ_X_MAGIC_4, s->blockSize100k, 8) |
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| 207 | if (s->blockSize100k < (BZ_HDR_0 + 1) || |
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| 208 | s->blockSize100k > (BZ_HDR_0 + 9)) RETURN(BZ_DATA_ERROR_MAGIC); |
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| 209 | s->blockSize100k -= BZ_HDR_0; |
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| 210 | |||
| 211 | if (s->smallDecompress) { |
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| 212 | s->ll16 = BZALLOC( s->blockSize100k * 100000 * sizeof(UInt16) ); |
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| 213 | s->ll4 = BZALLOC( |
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| 214 | ((1 + s->blockSize100k * 100000) >> 1) * sizeof(UChar) |
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| 215 | ); |
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| 216 | if (s->ll16 == NULL || s->ll4 == NULL) RETURN(BZ_MEM_ERROR); |
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| 217 | } else { |
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| 218 | s->tt = BZALLOC( s->blockSize100k * 100000 * sizeof(Int32) ); |
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| 219 | if (s->tt == NULL) RETURN(BZ_MEM_ERROR); |
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| 220 | } |
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| 221 | |||
| 222 | GET_UCHAR(BZ_X_BLKHDR_1, uc); |
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| 223 | |||
| 224 | if (uc == 0x17) goto endhdr_2; |
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| 225 | if (uc != 0x31) RETURN(BZ_DATA_ERROR); |
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| 226 | GET_UCHAR(BZ_X_BLKHDR_2, uc); |
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| 227 | if (uc != 0x41) RETURN(BZ_DATA_ERROR); |
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| 228 | GET_UCHAR(BZ_X_BLKHDR_3, uc); |
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| 229 | if (uc != 0x59) RETURN(BZ_DATA_ERROR); |
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| 230 | GET_UCHAR(BZ_X_BLKHDR_4, uc); |
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| 231 | if (uc != 0x26) RETURN(BZ_DATA_ERROR); |
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| 232 | GET_UCHAR(BZ_X_BLKHDR_5, uc); |
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| 233 | if (uc != 0x53) RETURN(BZ_DATA_ERROR); |
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| 234 | GET_UCHAR(BZ_X_BLKHDR_6, uc); |
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| 235 | if (uc != 0x59) RETURN(BZ_DATA_ERROR); |
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| 236 | |||
| 237 | s->currBlockNo++; |
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| 238 | if (s->verbosity >= 2) |
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| 239 | VPrintf1 ( "\n [%d: huff+mtf ", s->currBlockNo ); |
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| 240 | |||
| 241 | s->storedBlockCRC = 0; |
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| 242 | GET_UCHAR(BZ_X_BCRC_1, uc); |
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| 243 | s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc); |
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| 244 | GET_UCHAR(BZ_X_BCRC_2, uc); |
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| 245 | s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc); |
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| 246 | GET_UCHAR(BZ_X_BCRC_3, uc); |
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| 247 | s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc); |
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| 248 | GET_UCHAR(BZ_X_BCRC_4, uc); |
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| 249 | s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc); |
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| 250 | |||
| 251 | GET_BITS(BZ_X_RANDBIT, s->blockRandomised, 1); |
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| 252 | |||
| 253 | s->origPtr = 0; |
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| 254 | GET_UCHAR(BZ_X_ORIGPTR_1, uc); |
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| 255 | s->origPtr = (s->origPtr << 8) | ((Int32)uc); |
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| 256 | GET_UCHAR(BZ_X_ORIGPTR_2, uc); |
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| 257 | s->origPtr = (s->origPtr << 8) | ((Int32)uc); |
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| 258 | GET_UCHAR(BZ_X_ORIGPTR_3, uc); |
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| 259 | s->origPtr = (s->origPtr << 8) | ((Int32)uc); |
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| 260 | |||
| 261 | if (s->origPtr < 0) |
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| 262 | RETURN(BZ_DATA_ERROR); |
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| 263 | if (s->origPtr > 10 + 100000*s->blockSize100k) |
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| 264 | RETURN(BZ_DATA_ERROR); |
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| 265 | |||
| 266 | /*--- Receive the mapping table ---*/ |
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| 267 | for (i = 0; i < 16; i++) { |
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| 268 | GET_BIT(BZ_X_MAPPING_1, uc); |
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| 269 | if (uc == 1) |
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| 270 | s->inUse16[i] = True; else |
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| 271 | s->inUse16[i] = False; |
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| 272 | } |
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| 273 | |||
| 274 | for (i = 0; i < 256; i++) s->inUse[i] = False; |
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| 275 | |||
| 276 | for (i = 0; i < 16; i++) |
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| 277 | if (s->inUse16[i]) |
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| 278 | for (j = 0; j < 16; j++) { |
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| 279 | GET_BIT(BZ_X_MAPPING_2, uc); |
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| 280 | if (uc == 1) s->inUse[i * 16 + j] = True; |
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| 281 | } |
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| 282 | makeMaps_d ( s ); |
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| 283 | if (s->nInUse == 0) RETURN(BZ_DATA_ERROR); |
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| 284 | alphaSize = s->nInUse+2; |
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| 285 | |||
| 286 | /*--- Now the selectors ---*/ |
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| 287 | GET_BITS(BZ_X_SELECTOR_1, nGroups, 3); |
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| 288 | if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR); |
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| 289 | GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15); |
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| 290 | if (nSelectors < 1) RETURN(BZ_DATA_ERROR); |
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| 291 | for (i = 0; i < nSelectors; i++) { |
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| 292 | j = 0; |
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| 293 | while (True) { |
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| 294 | GET_BIT(BZ_X_SELECTOR_3, uc); |
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| 295 | if (uc == 0) break; |
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| 296 | j++; |
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| 297 | if (j >= nGroups) RETURN(BZ_DATA_ERROR); |
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| 298 | } |
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| 299 | s->selectorMtf[i] = j; |
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| 300 | } |
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| 301 | |||
| 302 | /*--- Undo the MTF values for the selectors. ---*/ |
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| 303 | { |
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| 304 | UChar pos[BZ_N_GROUPS], tmp, v; |
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| 305 | for (v = 0; v < nGroups; v++) pos[v] = v; |
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| 306 | |||
| 307 | for (i = 0; i < nSelectors; i++) { |
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| 308 | v = s->selectorMtf[i]; |
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| 309 | tmp = pos[v]; |
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| 310 | while (v > 0) { pos[v] = pos[v-1]; v--; } |
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| 311 | pos[0] = tmp; |
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| 312 | s->selector[i] = tmp; |
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| 313 | } |
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| 314 | } |
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| 315 | |||
| 316 | /*--- Now the coding tables ---*/ |
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| 317 | for (t = 0; t < nGroups; t++) { |
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| 318 | GET_BITS(BZ_X_CODING_1, curr, 5); |
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| 319 | for (i = 0; i < alphaSize; i++) { |
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| 320 | while (True) { |
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| 321 | if (curr < 1 || curr > 20) RETURN(BZ_DATA_ERROR); |
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| 322 | GET_BIT(BZ_X_CODING_2, uc); |
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| 323 | if (uc == 0) break; |
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| 324 | GET_BIT(BZ_X_CODING_3, uc); |
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| 325 | if (uc == 0) curr++; else curr--; |
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| 326 | } |
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| 327 | s->len[t][i] = curr; |
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| 328 | } |
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| 329 | } |
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| 330 | |||
| 331 | /*--- Create the Huffman decoding tables ---*/ |
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| 332 | for (t = 0; t < nGroups; t++) { |
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| 333 | minLen = 32; |
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| 334 | maxLen = 0; |
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| 335 | for (i = 0; i < alphaSize; i++) { |
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| 336 | if (s->len[t][i] > maxLen) maxLen = s->len[t][i]; |
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| 337 | if (s->len[t][i] < minLen) minLen = s->len[t][i]; |
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| 338 | } |
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| 339 | BZ2_hbCreateDecodeTables ( |
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| 340 | &(s->limit[t][0]), |
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| 341 | &(s->base[t][0]), |
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| 342 | &(s->perm[t][0]), |
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| 343 | &(s->len[t][0]), |
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| 344 | minLen, maxLen, alphaSize |
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| 345 | ); |
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| 346 | s->minLens[t] = minLen; |
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| 347 | } |
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| 348 | |||
| 349 | /*--- Now the MTF values ---*/ |
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| 350 | |||
| 351 | EOB = s->nInUse+1; |
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| 352 | nblockMAX = 100000 * s->blockSize100k; |
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| 353 | groupNo = -1; |
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| 354 | groupPos = 0; |
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| 355 | |||
| 356 | for (i = 0; i <= 255; i++) s->unzftab[i] = 0; |
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| 357 | |||
| 358 | /*-- MTF init --*/ |
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| 359 | { |
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| 360 | Int32 ii, jj, kk; |
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| 361 | kk = MTFA_SIZE-1; |
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| 362 | for (ii = 256 / MTFL_SIZE - 1; ii >= 0; ii--) { |
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| 363 | for (jj = MTFL_SIZE-1; jj >= 0; jj--) { |
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| 364 | s->mtfa[kk] = (UChar)(ii * MTFL_SIZE + jj); |
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| 365 | kk--; |
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| 366 | } |
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| 367 | s->mtfbase[ii] = kk + 1; |
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| 368 | } |
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| 369 | } |
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| 370 | /*-- end MTF init --*/ |
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| 371 | |||
| 372 | nblock = 0; |
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| 373 | GET_MTF_VAL(BZ_X_MTF_1, BZ_X_MTF_2, nextSym); |
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| 374 | |||
| 375 | while (True) { |
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| 376 | |||
| 377 | if (nextSym == EOB) break; |
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| 378 | |||
| 379 | if (nextSym == BZ_RUNA || nextSym == BZ_RUNB) { |
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| 380 | |||
| 381 | es = -1; |
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| 382 | N = 1; |
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| 383 | do { |
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| 384 | if (nextSym == BZ_RUNA) es = es + (0+1) * N; else |
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| 385 | if (nextSym == BZ_RUNB) es = es + (1+1) * N; |
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| 386 | N = N * 2; |
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| 387 | GET_MTF_VAL(BZ_X_MTF_3, BZ_X_MTF_4, nextSym); |
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| 388 | } |
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| 389 | while (nextSym == BZ_RUNA || nextSym == BZ_RUNB); |
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| 390 | |||
| 391 | es++; |
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| 392 | uc = s->seqToUnseq[ s->mtfa[s->mtfbase[0]] ]; |
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| 393 | s->unzftab[uc] += es; |
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| 394 | |||
| 395 | if (s->smallDecompress) |
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| 396 | while (es > 0) { |
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| 397 | if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR); |
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| 398 | s->ll16[nblock] = (UInt16)uc; |
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| 399 | nblock++; |
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| 400 | es--; |
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| 401 | } |
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| 402 | else |
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| 403 | while (es > 0) { |
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| 404 | if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR); |
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| 405 | s->tt[nblock] = (UInt32)uc; |
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| 406 | nblock++; |
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| 407 | es--; |
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| 408 | }; |
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| 409 | |||
| 410 | continue; |
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| 411 | |||
| 412 | } else { |
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| 413 | |||
| 414 | if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR); |
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| 415 | |||
| 416 | /*-- uc = MTF ( nextSym-1 ) --*/ |
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| 417 | { |
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| 418 | Int32 ii, jj, kk, pp, lno, off; |
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| 419 | UInt32 nn; |
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| 420 | nn = (UInt32)(nextSym - 1); |
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| 421 | |||
| 422 | if (nn < MTFL_SIZE) { |
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| 423 | /* avoid general-case expense */ |
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| 424 | pp = s->mtfbase[0]; |
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| 425 | uc = s->mtfa[pp+nn]; |
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| 426 | while (nn > 3) { |
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| 427 | Int32 z = pp+nn; |
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| 428 | s->mtfa[(z) ] = s->mtfa[(z)-1]; |
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| 429 | s->mtfa[(z)-1] = s->mtfa[(z)-2]; |
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| 430 | s->mtfa[(z)-2] = s->mtfa[(z)-3]; |
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| 431 | s->mtfa[(z)-3] = s->mtfa[(z)-4]; |
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| 432 | nn -= 4; |
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| 433 | } |
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| 434 | while (nn > 0) { |
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| 435 | s->mtfa[(pp+nn)] = s->mtfa[(pp+nn)-1]; nn--; |
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| 436 | }; |
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| 437 | s->mtfa[pp] = uc; |
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| 438 | } else { |
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| 439 | /* general case */ |
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| 440 | lno = nn / MTFL_SIZE; |
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| 441 | off = nn % MTFL_SIZE; |
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| 442 | pp = s->mtfbase[lno] + off; |
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| 443 | uc = s->mtfa[pp]; |
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| 444 | while (pp > s->mtfbase[lno]) { |
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| 445 | s->mtfa[pp] = s->mtfa[pp-1]; pp--; |
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| 446 | }; |
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| 447 | s->mtfbase[lno]++; |
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| 448 | while (lno > 0) { |
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| 449 | s->mtfbase[lno]--; |
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| 450 | s->mtfa[s->mtfbase[lno]] |
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| 451 | = s->mtfa[s->mtfbase[lno-1] + MTFL_SIZE - 1]; |
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| 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 | /*-------------------------------------------------------------*/ |