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- #include "bzlib.h"
-
- #if defined(NSIS_COMPRESS_USE_BZIP2) && defined(NSIS_CONFIG_COMPRESSION_SUPPORT)
-
- /*-------------------------------------------------------------*/
- /*--- Decompression machinery ---*/
- /*--- decompress.c ---*/
- /*-------------------------------------------------------------*/
-
- /*--
- This file is a part of bzip2 and/or libbzip2, a program and
- library for lossless, block-sorting data compression.
-
- Copyright (C) 1996-2000 Julian R Seward. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. The origin of this software must not be misrepresented; you must
- not claim that you wrote the original software. If you use this
- software in a product, an acknowledgment in the product
- documentation would be appreciated but is not required.
-
- 3. Altered source versions must be plainly marked as such, and must
- not be misrepresented as being the original software.
-
- 4. The name of the author may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Julian Seward, Cambridge, UK.
- jseward@acm.org
- bzip2/libbzip2 version 1.0 of 21 March 2000
-
- This program is based on (at least) the work of:
- Mike Burrows
- David Wheeler
- Peter Fenwick
- Alistair Moffat
- Radford Neal
- Ian H. Witten
- Robert Sedgewick
- Jon L. Bentley
-
- For more information on these sources, see the manual.
- --*/
-
-
- /*---------------------------------------------------*/
- #define RETURN(rrr) \
- { retVal = rrr; goto save_state_and_return; };
-
-
- static int __mygetbits(int *vtmp, int nnn, DState* s)
- {
- for (;;) {
- if (s->bsLive >= nnn) {
- UInt32 v;
- v = (s->bsBuff >>
- (s->bsLive-nnn)) & ((1 << nnn)-1);
- s->bsLive -= nnn;
- *vtmp = v;
- return 0;
- }
- if (s->avail_in == 0) return 1;
- s->bsBuff = (s->bsBuff << 8) | ((UInt32) (*((UChar*)(s->next_in))));
- s->bsLive += 8;
- s->next_in++;
- s->avail_in--;
- }
- }
-
- #define GET_BITS(lll,vvv,nnn) \
- case lll: s->state = lll; \
- if (__mygetbits(&vvv,nnn,s)) RETURN(BZ_OK)
-
- #define GET_UCHAR(lll,uuu) \
- GET_BITS(lll,uuu,8)
-
- #define GET_BIT(lll,uuu) \
- GET_BITS(lll,uuu,1)
-
- static int getmtf1(DState_save *sv,DState* s)
- {
- if (sv->groupPos == 0) {
- sv->groupNo++;
- if (sv->groupNo >= sv->nSelectors) return 1;
- sv->groupPos = BZ_G_SIZE;
- sv->gSel = s->selector[sv->groupNo];
- sv->gMinlen = s->minLens[sv->gSel];
- sv->gLimit = &(s->limit[sv->gSel][0]);
- sv->gPerm = &(s->perm[sv->gSel][0]);
- sv->gBase = &(s->base[sv->gSel][0]);
- }
- sv->groupPos--;
- sv->zn = sv->gMinlen;
- return 0;
- }
-
- /*---------------------------------------------------*/
- #define GET_MTF_VAL(label1,label2,lval) \
- { \
- if (getmtf1(&sv,s)) RETURN(BZ_DATA_ERROR); \
- GET_BITS(label1, zvec, zn); \
- for (;;) { \
- if (zn > 20 /* the longest code */) RETURN(BZ_DATA_ERROR); \
- if (zvec <= gLimit[zn]) break; \
- zn++; \
- GET_BIT(label2, zj); \
- zvec = (zvec << 1) | zj; \
- }; \
- if (zvec - gBase[zn] < 0 \
- || zvec - gBase[zn] >= BZ_MAX_ALPHA_SIZE) \
- RETURN(BZ_DATA_ERROR); \
- lval = gPerm[zvec - gBase[zn]]; \
- }
-
-
- /*---------------------------------------------------*/
- Int32 BZ2_decompress ( DState* s )
- {
- Int32 uc;
- Int32 retVal;
- Int32 minLen, maxLen;
-
- /* stuff that needs to be saved/restored */
- DState_save sv;
-
- /*restore from the save area*/
- sv=s->save;//mini_memcpy(&sv, &(s->save), sizeof(sv));
-
- #define i (sv.i)
- #define j (sv.j)
- #define t (sv.t)
- #define alphaSize (sv.alphaSize)
- #define nGroups (sv.nGroups)
- #define nSelectors (sv.nSelectors)
- #define EOB (sv.EOB)
- #define groupNo (sv.groupNo)
- #define groupPos (sv.groupPos)
- #define nextSym (sv.nextSym)
- #define nblockMAX (sv.nblockMAX)
- #define nblock (sv.nblock)
- #define es (sv.es)
- #define N (sv.N)
- #define curr (sv.curr)
- #define zt (sv.zt)
- #define zn (sv.zn)
- #define zvec (sv.zvec)
- #define zj (sv.zj)
- #define gSel (sv.gSel)
- #define gMinlen (sv.gMinlen)
- #define gLimit (sv.gLimit)
- #define gBase (sv.gBase)
- #define gPerm (sv.gPerm)
-
- retVal = BZ_OK;
-
- switch (s->state) {
-
-
- GET_UCHAR(BZ_X_BLKHDR_1, uc);
-
- if (uc == 0x17)
- {
- s->state = BZ_X_IDLE;
- RETURN(BZ_STREAM_END);
- }
- if (uc != 0x31) RETURN(BZ_DATA_ERROR);
-
- s->origPtr = 0;
- GET_UCHAR(BZ_X_ORIGPTR_1, uc);
- s->origPtr = (s->origPtr << 8) | ((Int32)uc);
- GET_UCHAR(BZ_X_ORIGPTR_2, uc);
- s->origPtr = (s->origPtr << 8) | ((Int32)uc);
- GET_UCHAR(BZ_X_ORIGPTR_3, uc);
- s->origPtr = (s->origPtr << 8) | ((Int32)uc);
-
- if (s->origPtr < 0)
- RETURN(BZ_DATA_ERROR);
- if (s->origPtr > 10 + NSIS_COMPRESS_BZIP2_LEVEL*100000)
- RETURN(BZ_DATA_ERROR);
-
- /*--- Receive the mapping table ---*/
- for (i = 0; i < 16; i++) {
- GET_BIT(BZ_X_MAPPING_1, uc);
- if (uc == 1)
- s->inUse16[i] = True; else
- s->inUse16[i] = False;
- }
-
- for (i = 0; i < 256; i++) s->inUse[i] = False;
-
- for (i = 0; i < 16; i++)
- if (s->inUse16[i])
- for (j = 0; j < 16; j++) {
- GET_BIT(BZ_X_MAPPING_2, uc);
- if (uc == 1) s->inUse[i * 16 + j] = True;
- }
- {
- Int32 qi;
- s->nInUse = 0;
- for (qi = 0; qi < 256; qi++)
- if (s->inUse[qi])
- s->seqToUnseq[s->nInUse++] = qi;
- }
-
- if (s->nInUse == 0) RETURN(BZ_DATA_ERROR);
- alphaSize = s->nInUse+2;
-
- /*--- Now the selectors ---*/
- GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
- if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
- GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
- if (nSelectors < 1) RETURN(BZ_DATA_ERROR);
- for (i = 0; i < nSelectors; i++) {
- j = 0;
- while (True) {
- GET_BIT(BZ_X_SELECTOR_3, uc);
- if (uc == 0) break;
- j++;
- if (j >= nGroups) RETURN(BZ_DATA_ERROR);
- }
- s->selectorMtf[i] = j;
- }
-
- /*--- Undo the MTF values for the selectors. ---*/
- {
- UChar pos[BZ_N_GROUPS], tmp, v;
- for (v = 0; v < nGroups; v++) pos[v] = v;
-
- for (i = 0; i < nSelectors; i++) {
- v = s->selectorMtf[i];
- tmp = pos[v];
- while (v > 0) { pos[v] = pos[v-1]; v--; }
- pos[0] = tmp;
- s->selector[i] = tmp;
- }
- }
-
- /*--- Now the coding tables ---*/
- for (t = 0; t < nGroups; t++) {
- GET_BITS(BZ_X_CODING_1, curr, 5);
- for (i = 0; i < alphaSize; i++) {
- while (True) {
- if (curr < 1 || curr > 20) RETURN(BZ_DATA_ERROR);
- GET_BIT(BZ_X_CODING_2, uc);
- if (uc == 0) break;
- GET_BIT(BZ_X_CODING_3, uc);
- if (uc == 0) curr++; else curr--;
- }
- s->len[t][i] = curr;
- }
- }
-
- /*--- Create the Huffman decoding tables ---*/
- for (t = 0; t < nGroups; t++) {
- minLen = 32;
- maxLen = 0;
- for (i = 0; i < alphaSize; i++) {
- if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
- if (s->len[t][i] < minLen) minLen = s->len[t][i];
- }
- BZ2_hbCreateDecodeTables (
- &(s->limit[t][0]),
- &(s->base[t][0]),
- &(s->perm[t][0]),
- &(s->len[t][0]),
- minLen, maxLen, alphaSize
- );
- s->minLens[t] = minLen;
- }
-
- /*--- Now the MTF values ---*/
-
- EOB = s->nInUse+1;
- nblockMAX = NSIS_COMPRESS_BZIP2_LEVEL*100000;
- groupNo = -1;
- groupPos = 0;
-
- for (i = 0; i <= 255; i++) s->unzftab[i] = 0;
-
- /*-- MTF init --*/
- {
- Int32 ii, jj, kk = MTFA_SIZE-1;
- for (ii = 256 / MTFL_SIZE - 1; ii >= 0; ii--) {
- for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
- s->mtfa[kk] = (UChar)(ii * MTFL_SIZE + jj);
- kk--;
- }
- s->mtfbase[ii] = kk + 1;
- }
- }
- /*-- end MTF init --*/
-
- nblock = 0;
- GET_MTF_VAL(BZ_X_MTF_1, BZ_X_MTF_2, nextSym);
-
- while (True) {
-
- if (nextSym == EOB) break;
-
- if (nextSym == BZ_RUNA || nextSym == BZ_RUNB) {
-
- es = -1;
- N = 1;
- while (nextSym == BZ_RUNA || nextSym == BZ_RUNB)
- {
- if (nextSym == BZ_RUNA) es += N;
- N = N << 1;
- if (nextSym == BZ_RUNB) es += N;
- GET_MTF_VAL(BZ_X_MTF_3, BZ_X_MTF_4, nextSym);
- }
-
- es++;
- uc = s->seqToUnseq[ s->mtfa[s->mtfbase[0]] ];
- s->unzftab[uc] += es;
-
- #ifdef NSIS_COMPRESS_BZIP2_SMALLMODE
- while (es > 0) {
- if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
- s->ll16[nblock] = (UInt16)uc;
- nblock++;
- es--;
- }
- #else
- while (es > 0) {
- if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
- s->tt[nblock] = (UInt32)uc;
- nblock++;
- es--;
- }
- #endif
- continue;
-
- } else {
-
- if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
-
- /*-- uc = MTF ( nextSym-1 ) --*/
- {
- Int32 ii, jj, kk, pp, lno, off;
- UInt32 nn;
- nn = (UInt32)(nextSym - 1);
-
- if (nn < MTFL_SIZE) {
- /* avoid general-case expense */
- pp = s->mtfbase[0];
- uc = s->mtfa[pp+nn];
- /*while (nn > 3) {
- Int32 z = pp+nn;
- s->mtfa[(z) ] = s->mtfa[(z)-1];
- s->mtfa[(z)-1] = s->mtfa[(z)-2];
- s->mtfa[(z)-2] = s->mtfa[(z)-3];
- s->mtfa[(z)-3] = s->mtfa[(z)-4];
- nn -= 4;
- }
- */
- while (nn > 0) {
- s->mtfa[(pp+nn)] = s->mtfa[(pp+nn)-1]; nn--;
- };
- s->mtfa[pp] = uc;
- } else {
- /* general case */
- lno = nn / MTFL_SIZE;
- off = nn % MTFL_SIZE;
- pp = s->mtfbase[lno] + off;
- uc = s->mtfa[pp];
- while (pp > s->mtfbase[lno]) {
- s->mtfa[pp] = s->mtfa[pp-1]; pp--;
- };
- s->mtfbase[lno]++;
- while (lno > 0) {
- s->mtfbase[lno]--;
- s->mtfa[s->mtfbase[lno]]
- = s->mtfa[s->mtfbase[lno-1] + MTFL_SIZE - 1];
- lno--;
- }
- s->mtfbase[0]--;
- s->mtfa[s->mtfbase[0]] = uc;
- if (s->mtfbase[0] == 0) {
- kk = MTFA_SIZE-1;
- for (ii = 256 / MTFL_SIZE-1; ii >= 0; ii--) {
- for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
- s->mtfa[kk] = s->mtfa[s->mtfbase[ii] + jj];
- kk--;
- }
- s->mtfbase[ii] = kk + 1;
- }
- }
- }
- }
- /*-- end uc = MTF ( nextSym-1 ) --*/
-
- s->unzftab[s->seqToUnseq[uc]]++;
- #ifdef NSIS_COMPRESS_BZIP2_SMALLMODE
- s->ll16[nblock] = (UInt16)(s->seqToUnseq[uc]);
- #else
- s->tt[nblock] = (UInt32)(s->seqToUnseq[uc]);
- #endif
- nblock++;
-
- GET_MTF_VAL(BZ_X_MTF_5, BZ_X_MTF_6, nextSym);
- continue;
- }
- }
-
- /* Now we know what nblock is, we can do a better sanity
- check on s->origPtr.
- */
- if (s->origPtr < 0 || s->origPtr >= nblock)
- RETURN(BZ_DATA_ERROR);
-
- s->state_out_len = 0;
- s->state_out_ch = 0;
- s->state = BZ_X_OUTPUT;
-
- /*-- Set up cftab to facilitate generation of T^(-1) --*/
- s->cftab[0] = 0;
- for (i = 1; i <= 256; i++) s->cftab[i] = s->unzftab[i-1]+s->cftab[i-1];
- // for (i = 1; i <= 256; i++) s->cftab[i] += s->cftab[i-1];
-
- #ifdef NSIS_COMPRESS_BZIP2_SMALLMODE
- {
- /*-- Make a copy of cftab, used in generation of T --*/
- for (i = 0; i <= 256; i++) s->cftabCopy[i] = s->cftab[i];
-
- /*-- compute the T vector --*/
- for (i = 0; i < nblock; i++) {
- uc = (UChar)(s->ll16[i]);
- SET_LL(i, s->cftabCopy[uc]);
- s->cftabCopy[uc]++;
- }
-
- /*-- Compute T^(-1) by pointer reversal on T --*/
- i = s->origPtr;
- j = GET_LL(i);
- do {
- Int32 tmp = GET_LL(j);
- SET_LL(j, i);
- i = j;
- j = tmp;
- }
- while (i != s->origPtr);
-
- s->tPos = s->origPtr;
- s->nblock_used = 0;
- BZ_GET_SMALL(s->k0); s->nblock_used++;
- }
- #else//!small
-
- /*-- compute the T^(-1) vector --*/
- for (i = 0; i < nblock; i++) {
- uc = (UChar)(s->tt[i] & 0xff);
- s->tt[s->cftab[uc]] |= (i << 8);
- s->cftab[uc]++;
- }
-
- s->tPos = s->tt[s->origPtr] >> 8;
- s->nblock_used = 0;
- BZ_GET_FAST(s->k0); s->nblock_used++;
- #endif
- RETURN(BZ_OK);
-
- default: AssertH ( False, 4001 );
- }
-
- AssertH ( False, 4002 );
-
- save_state_and_return:
-
- s->save=sv; //mini_memcpy(&(s->save), &sv, sizeof(sv));
-
- #undef i
- #undef j
- #undef t
- #undef alphaSize
- #undef nGroups
- #undef nSelectors
- #undef EOB
- #undef groupNo
- #undef groupPos
- #undef nextSym
- #undef nblockMAX
- #undef nblock
- #undef es
- #undef N
- #undef curr
- #undef zt
- #undef zn
- #undef zvec
- #undef zj
- #undef gSel
- #undef gMinlen
- #undef gLimit
- #undef gBase
- #undef gPerm
-
- return retVal;
- }
-
-
- /*-------------------------------------------------------------*/
- /*--- end decompress.c ---*/
- /*-------------------------------------------------------------*/
- #endif
-