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unbzip2.c
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unbzip2.c
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// Patched version of BZip2 v0.1, which now compiles under
// Open Watcom for Win16 target. Original code has been remade
// as a "ready to use" library for decompressing data arrays.
// This (ugly) patched version by Magnetic-Fox, 16th March 2024.
// IMPORTANT: THIS IS NOT AN ORIGINAL CODE OF BZIP2 NOR I'M
// THE AUTHOR OF THIS WONDERFUL COMPRESSION/DECOMPRESSION TOOL!
// FOR THE MOST TESTED AND ERROR FREE VERSION YOU SHOULD ALWAYS
// USE OFFICIAL AND UP-TO-DATE VERSION OF BZIP2 CODE, WHICH CAN
// BE FOUND HERE:
// https://sourceware.org/bzip2/
// Below is the part of the original comment from bzip2.c file,
// version 0.1 from August 1997 to include information about
// people, whose work was used to create this code.
// There are also some occasional original comments in the code.
// ORIGINAL COMMENT STARTS HERE
/*-----------------------------------------------------------*/
/*--- A block-sorting, lossless compressor bzip2.c ---*/
/*-----------------------------------------------------------*/
/*--
This program is bzip2, a lossless, block-sorting data compressor,
version 0.1pl0, dated 17-Aug-1997.
Copyright (C) 1996, 1997 by Julian Seward.
Guildford, Surrey, UK
email: jseward@acm.org
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
The GNU General Public License is contained in the file LICENSE.
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 file ALGORITHMS.
--*/
// ORIGINAL COMMENT ENDS HERE
#include "unbzip2.h"
UInt32 bytesOut;
Bool smallMode;
UInt32 globalCrc;
UChar *block;
UInt16 *quadrant;
Int32 *zptr;
UInt16 *szptr;
Int32 *ftab;
UInt16 *ll16;
UChar *ll4;
Int32 *tt;
UChar *ll8;
Int32 unzftab[256];
Int32 last;
Int32 origPtr;
Int32 blockSize100k;
Int32 workFactor;
Int32 workDone;
Int32 workLimit;
Bool blockRandomised;
Bool firstAttempt;
Int32 nBlocksRandomised;
Bool inUse[256];
Int32 nInUse;
UChar seqToUnseq[256];
UChar unseqToSeq[256];
Int32 nMTF;
UChar *selector;
UChar *selectorMtf;
Int32 *mtfFreq;
UChar **len;
Int32 **limit;
Int32 **base;
Int32 **perm;
Int32 *minLens;
Int32 **code;
Int32 **rfreq;
UInt32 bsBuff;
Int32 bsLive;
UChar* bsStream;
UInt32 srcBufferPos;
UInt32 dstBufferPos;
UInt32 srcBufferMax;
UInt32 dstBufferMax;
typedef struct {
Int32 ll;
Int32 hh;
Int32 dd;
} StackElem;
const Int32 incs[14] = {
1, 4, 13, 40, 121, 364, 1093, 3280,
9841, 29524, 88573, 265720,
797161, 2391484
};
const Int32 rNums[512] = {
619, 720, 127, 481, 931, 816, 813, 233, 566, 247,
985, 724, 205, 454, 863, 491, 741, 242, 949, 214,
733, 859, 335, 708, 621, 574, 73, 654, 730, 472,
419, 436, 278, 496, 867, 210, 399, 680, 480, 51,
878, 465, 811, 169, 869, 675, 611, 697, 867, 561,
862, 687, 507, 283, 482, 129, 807, 591, 733, 623,
150, 238, 59, 379, 684, 877, 625, 169, 643, 105,
170, 607, 520, 932, 727, 476, 693, 425, 174, 647,
73, 122, 335, 530, 442, 853, 695, 249, 445, 515,
909, 545, 703, 919, 874, 474, 882, 500, 594, 612,
641, 801, 220, 162, 819, 984, 589, 513, 495, 799,
161, 604, 958, 533, 221, 400, 386, 867, 600, 782,
382, 596, 414, 171, 516, 375, 682, 485, 911, 276,
98, 553, 163, 354, 666, 933, 424, 341, 533, 870,
227, 730, 475, 186, 263, 647, 537, 686, 600, 224,
469, 68, 770, 919, 190, 373, 294, 822, 808, 206,
184, 943, 795, 384, 383, 461, 404, 758, 839, 887,
715, 67, 618, 276, 204, 918, 873, 777, 604, 560,
951, 160, 578, 722, 79, 804, 96, 409, 713, 940,
652, 934, 970, 447, 318, 353, 859, 672, 112, 785,
645, 863, 803, 350, 139, 93, 354, 99, 820, 908,
609, 772, 154, 274, 580, 184, 79, 626, 630, 742,
653, 282, 762, 623, 680, 81, 927, 626, 789, 125,
411, 521, 938, 300, 821, 78, 343, 175, 128, 250,
170, 774, 972, 275, 999, 639, 495, 78, 352, 126,
857, 956, 358, 619, 580, 124, 737, 594, 701, 612,
669, 112, 134, 694, 363, 992, 809, 743, 168, 974,
944, 375, 748, 52, 600, 747, 642, 182, 862, 81,
344, 805, 988, 739, 511, 655, 814, 334, 249, 515,
897, 955, 664, 981, 649, 113, 974, 459, 893, 228,
433, 837, 553, 268, 926, 240, 102, 654, 459, 51,
686, 754, 806, 760, 493, 403, 415, 394, 687, 700,
946, 670, 656, 610, 738, 392, 760, 799, 887, 653,
978, 321, 576, 617, 626, 502, 894, 679, 243, 440,
680, 879, 194, 572, 640, 724, 926, 56, 204, 700,
707, 151, 457, 449, 797, 195, 791, 558, 945, 679,
297, 59, 87, 824, 713, 663, 412, 693, 342, 606,
134, 108, 571, 364, 631, 212, 174, 643, 304, 329,
343, 97, 430, 751, 497, 314, 983, 374, 822, 928,
140, 206, 73, 263, 980, 736, 876, 478, 430, 305,
170, 514, 364, 692, 829, 82, 855, 953, 676, 246,
369, 970, 294, 750, 807, 827, 150, 790, 288, 923,
804, 378, 215, 828, 592, 281, 565, 555, 710, 82,
896, 831, 547, 261, 524, 462, 293, 465, 502, 56,
661, 821, 976, 991, 658, 869, 905, 758, 745, 193,
768, 550, 608, 933, 378, 286, 215, 979, 792, 961,
61, 688, 793, 644, 986, 403, 106, 366, 905, 644,
372, 567, 466, 434, 645, 210, 389, 550, 919, 135,
780, 773, 635, 389, 707, 100, 626, 958, 165, 504,
920, 176, 193, 713, 857, 265, 203, 50, 668, 108,
645, 990, 626, 197, 510, 357, 358, 850, 858, 364,
936, 638
};
const UInt32 crc32Table[256] = {
0x00000000L, 0x04c11db7L, 0x09823b6eL, 0x0d4326d9L,
0x130476dcL, 0x17c56b6bL, 0x1a864db2L, 0x1e475005L,
0x2608edb8L, 0x22c9f00fL, 0x2f8ad6d6L, 0x2b4bcb61L,
0x350c9b64L, 0x31cd86d3L, 0x3c8ea00aL, 0x384fbdbdL,
0x4c11db70L, 0x48d0c6c7L, 0x4593e01eL, 0x4152fda9L,
0x5f15adacL, 0x5bd4b01bL, 0x569796c2L, 0x52568b75L,
0x6a1936c8L, 0x6ed82b7fL, 0x639b0da6L, 0x675a1011L,
0x791d4014L, 0x7ddc5da3L, 0x709f7b7aL, 0x745e66cdL,
0x9823b6e0L, 0x9ce2ab57L, 0x91a18d8eL, 0x95609039L,
0x8b27c03cL, 0x8fe6dd8bL, 0x82a5fb52L, 0x8664e6e5L,
0xbe2b5b58L, 0xbaea46efL, 0xb7a96036L, 0xb3687d81L,
0xad2f2d84L, 0xa9ee3033L, 0xa4ad16eaL, 0xa06c0b5dL,
0xd4326d90L, 0xd0f37027L, 0xddb056feL, 0xd9714b49L,
0xc7361b4cL, 0xc3f706fbL, 0xceb42022L, 0xca753d95L,
0xf23a8028L, 0xf6fb9d9fL, 0xfbb8bb46L, 0xff79a6f1L,
0xe13ef6f4L, 0xe5ffeb43L, 0xe8bccd9aL, 0xec7dd02dL,
0x34867077L, 0x30476dc0L, 0x3d044b19L, 0x39c556aeL,
0x278206abL, 0x23431b1cL, 0x2e003dc5L, 0x2ac12072L,
0x128e9dcfL, 0x164f8078L, 0x1b0ca6a1L, 0x1fcdbb16L,
0x018aeb13L, 0x054bf6a4L, 0x0808d07dL, 0x0cc9cdcaL,
0x7897ab07L, 0x7c56b6b0L, 0x71159069L, 0x75d48ddeL,
0x6b93dddbL, 0x6f52c06cL, 0x6211e6b5L, 0x66d0fb02L,
0x5e9f46bfL, 0x5a5e5b08L, 0x571d7dd1L, 0x53dc6066L,
0x4d9b3063L, 0x495a2dd4L, 0x44190b0dL, 0x40d816baL,
0xaca5c697L, 0xa864db20L, 0xa527fdf9L, 0xa1e6e04eL,
0xbfa1b04bL, 0xbb60adfcL, 0xb6238b25L, 0xb2e29692L,
0x8aad2b2fL, 0x8e6c3698L, 0x832f1041L, 0x87ee0df6L,
0x99a95df3L, 0x9d684044L, 0x902b669dL, 0x94ea7b2aL,
0xe0b41de7L, 0xe4750050L, 0xe9362689L, 0xedf73b3eL,
0xf3b06b3bL, 0xf771768cL, 0xfa325055L, 0xfef34de2L,
0xc6bcf05fL, 0xc27dede8L, 0xcf3ecb31L, 0xcbffd686L,
0xd5b88683L, 0xd1799b34L, 0xdc3abdedL, 0xd8fba05aL,
0x690ce0eeL, 0x6dcdfd59L, 0x608edb80L, 0x644fc637L,
0x7a089632L, 0x7ec98b85L, 0x738aad5cL, 0x774bb0ebL,
0x4f040d56L, 0x4bc510e1L, 0x46863638L, 0x42472b8fL,
0x5c007b8aL, 0x58c1663dL, 0x558240e4L, 0x51435d53L,
0x251d3b9eL, 0x21dc2629L, 0x2c9f00f0L, 0x285e1d47L,
0x36194d42L, 0x32d850f5L, 0x3f9b762cL, 0x3b5a6b9bL,
0x0315d626L, 0x07d4cb91L, 0x0a97ed48L, 0x0e56f0ffL,
0x1011a0faL, 0x14d0bd4dL, 0x19939b94L, 0x1d528623L,
0xf12f560eL, 0xf5ee4bb9L, 0xf8ad6d60L, 0xfc6c70d7L,
0xe22b20d2L, 0xe6ea3d65L, 0xeba91bbcL, 0xef68060bL,
0xd727bbb6L, 0xd3e6a601L, 0xdea580d8L, 0xda649d6fL,
0xc423cd6aL, 0xc0e2d0ddL, 0xcda1f604L, 0xc960ebb3L,
0xbd3e8d7eL, 0xb9ff90c9L, 0xb4bcb610L, 0xb07daba7L,
0xae3afba2L, 0xaafbe615L, 0xa7b8c0ccL, 0xa379dd7bL,
0x9b3660c6L, 0x9ff77d71L, 0x92b45ba8L, 0x9675461fL,
0x8832161aL, 0x8cf30badL, 0x81b02d74L, 0x857130c3L,
0x5d8a9099L, 0x594b8d2eL, 0x5408abf7L, 0x50c9b640L,
0x4e8ee645L, 0x4a4ffbf2L, 0x470cdd2bL, 0x43cdc09cL,
0x7b827d21L, 0x7f436096L, 0x7200464fL, 0x76c15bf8L,
0x68860bfdL, 0x6c47164aL, 0x61043093L, 0x65c52d24L,
0x119b4be9L, 0x155a565eL, 0x18197087L, 0x1cd86d30L,
0x029f3d35L, 0x065e2082L, 0x0b1d065bL, 0x0fdc1becL,
0x3793a651L, 0x3352bbe6L, 0x3e119d3fL, 0x3ad08088L,
0x2497d08dL, 0x2056cd3aL, 0x2d15ebe3L, 0x29d4f654L,
0xc5a92679L, 0xc1683bceL, 0xcc2b1d17L, 0xc8ea00a0L,
0xd6ad50a5L, 0xd26c4d12L, 0xdf2f6bcbL, 0xdbee767cL,
0xe3a1cbc1L, 0xe760d676L, 0xea23f0afL, 0xeee2ed18L,
0xf0a5bd1dL, 0xf464a0aaL, 0xf9278673L, 0xfde69bc4L,
0x89b8fd09L, 0x8d79e0beL, 0x803ac667L, 0x84fbdbd0L,
0x9abc8bd5L, 0x9e7d9662L, 0x933eb0bbL, 0x97ffad0cL,
0xafb010b1L, 0xab710d06L, 0xa6322bdfL, 0xa2f33668L,
0xbcb4666dL, 0xb8757bdaL, 0xb5365d03L, 0xb1f740b4L
};
void initialiseCRC(void) {
globalCrc = 0xffffffffL;
}
UInt32 getFinalCRC(void) {
return ~globalCrc;
}
UInt32 getGlobalCRC(void) {
return globalCrc;
}
void setGlobalCRC(UInt32 newCrc) {
globalCrc = newCrc;
}
void bsSetStream(UChar* f, Bool wr) {
bsStream = f;
bsLive = 0;
bsBuff = 0;
bytesOut = 0;
}
void bsFinishedWithStream(void) {
bsStream = NULL;
}
UInt32 bsR(Int32 n) {
UInt32 v;
bsNEEDR ( n );
v = (bsBuff >> (bsLive-n)) & ((1 << n)-1);
bsLive -= n;
return v;
}
UChar bsGetUChar(void) {
return (UChar)bsR(8);
}
UInt32 bsGetUInt32(void) {
UInt32 u;
u = 0;
u = (u << 8) | bsR(8);
u = (u << 8) | bsR(8);
u = (u << 8) | bsR(8);
u = (u << 8) | bsR(8);
return u;
}
UInt32 bsGetIntVS(UInt32 numBits) {
return (UInt32)bsR(numBits);
}
Int32 bsGetInt32(void) {
return (Int32)bsGetUInt32();
}
void hbMakeCodeLengths(UChar *len, Int32 *freq, Int32 alphaSize, Int32 maxLen) {
/*--
Nodes and heap entries run from 1. Entry 0
for both the heap and nodes is a sentinel.
--*/
Int32 nNodes, nHeap, n1, n2, i, j, k;
Bool tooLong;
Int32 heap [ MAX_ALPHA_SIZE + 2 ];
Int32 weight [ MAX_ALPHA_SIZE * 2 ];
Int32 parent [ MAX_ALPHA_SIZE * 2 ];
for(i=0; i<alphaSize; i++)
weight[i+1] = (freq[i] == 0 ? 1 : freq[i]) << 8;
while(True) {
nNodes = alphaSize;
nHeap = 0;
heap[0] = 0;
weight[0] = 0;
parent[0] = -2;
for (i = 1; i <= alphaSize; i++) {
parent[i] = -1;
nHeap++;
heap[nHeap] = i;
UPHEAP(nHeap);
}
while (nHeap > 1) {
n1 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
n2 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
nNodes++;
parent[n1] = parent[n2] = nNodes;
weight[nNodes] = ADDWEIGHTS(weight[n1], weight[n2]);
parent[nNodes] = -1;
nHeap++;
heap[nHeap] = nNodes;
UPHEAP(nHeap);
}
tooLong = False;
for (i = 1; i <= alphaSize; i++) {
j = 0;
k = i;
while (parent[k] >= 0) { k = parent[k]; j++; }
len[i-1] = j;
if (j > maxLen) tooLong = True;
}
if (! tooLong) break;
for (i = 1; i < alphaSize; i++) {
j = weight[i] >> 8;
j = 1 + (j / 2);
weight[i] = j << 8;
}
}
}
void hbAssignCodes(Int32 *code, UChar *length, Int32 minLen, Int32 maxLen, Int32 alphaSize) {
Int32 n, vec, i;
vec = 0;
for (n = minLen; n <= maxLen; n++) {
for (i = 0; i < alphaSize; i++)
if (length[i] == n) { code[i] = vec; vec++; };
vec <<= 1;
}
}
void hbCreateDecodeTables(Int32 *limit, Int32 *base, Int32 *perm, UChar *length, Int32 minLen, Int32 maxLen, Int32 alphaSize) {
Int32 pp, i, j, vec;
pp = 0;
for (i = minLen; i <= maxLen; i++)
for (j = 0; j < alphaSize; j++)
if (length[j] == i) { perm[pp] = j; pp++; };
for (i = 0; i < MAX_CODE_LEN; i++) base[i] = 0;
for (i = 0; i < alphaSize; i++) base[length[i]+1]++;
for (i = 1; i < MAX_CODE_LEN; i++) base[i] += base[i-1];
for (i = 0; i < MAX_CODE_LEN; i++) limit[i] = 0;
vec = 0;
for (i = minLen; i <= maxLen; i++) {
vec += (base[i+1] - base[i]);
limit[i] = vec-1;
vec <<= 1;
}
for (i = minLen + 1; i <= maxLen; i++)
base[i] = ((limit[i-1] + 1) << 1) - base[i];
}
void setDecompressStructureSizes(Int32 newSize100k) {
if (newSize100k == blockSize100k) return;
blockSize100k = newSize100k;
if (ll16 != NULL) hfree ( ll16 );
if (ll4 != NULL) hfree ( ll4 );
if (ll8 != NULL) hfree ( ll8 );
if (tt != NULL) hfree ( tt );
if (newSize100k == 0) return;
if (smallMode) {
Int32 n = 100000 * newSize100k;
ll16 = halloc ( n, sizeof(UInt16) );
ll4 = halloc ( ((n+1) >> 1), sizeof(UChar) );
}
else {
Int32 n = 100000 * newSize100k;
ll8 = halloc ( n, sizeof(UChar) );
tt = halloc ( n, sizeof(Int32) );
}
}
void makeMaps(void) {
Int32 i;
nInUse = 0;
for (i = 0; i < 256; i++)
if (inUse[i]) {
seqToUnseq[nInUse] = i;
unseqToSeq[i] = nInUse;
nInUse++;
}
}
void recvDecodingTables(void) {
Int32 i, j, t, nGroups, nSelectors, alphaSize;
Int32 minLen, maxLen;
Bool inUse16[16];
/*--- Receive the mapping table ---*/
for (i = 0; i < 16; i++)
if (bsR(1) == 1)
inUse16[i] = True; else
inUse16[i] = False;
for (i = 0; i < 256; i++) inUse[i] = False;
for (i = 0; i < 16; i++)
if (inUse16[i])
for (j = 0; j < 16; j++)
if (bsR(1) == 1) inUse[i * 16 + j] = True;
makeMaps();
alphaSize = nInUse+2;
/*--- Now the selectors ---*/
nGroups = bsR ( 3 );
nSelectors = bsR ( 15 );
for (i = 0; i < nSelectors; i++) {
j = 0;
while (bsR(1) == 1) j++;
selectorMtf[i] = j;
}
/*--- Undo the MTF values for the selectors. ---*/
{
UChar pos[N_GROUPS], tmp, v;
for (v = 0; v < nGroups; v++) pos[v] = v;
for (i = 0; i < nSelectors; i++) {
v = selectorMtf[i];
tmp = pos[v];
while (v > 0) { pos[v] = pos[v-1]; v--; }
pos[0] = tmp;
selector[i] = tmp;
}
}
/*--- Now the coding tables ---*/
for (t = 0; t < nGroups; t++) {
Int32 curr = bsR ( 5 );
for (i = 0; i < alphaSize; i++) {
while (bsR(1) == 1) {
if (bsR(1) == 0) curr++; else curr--;
}
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 (len[t][i] > maxLen) maxLen = len[t][i];
if (len[t][i] < minLen) minLen = len[t][i];
}
hbCreateDecodeTables (
&limit[t][0], &base[t][0], &perm[t][0], &len[t][0],
minLen, maxLen, alphaSize
);
minLens[t] = minLen;
}
}
void getAndMoveToFrontDecode(void) {
UChar yy[256];
Int32 i, j, nextSym, limitLast;
Int32 EOB, groupNo, groupPos;
limitLast = 100000 * blockSize100k;
origPtr = bsGetIntVS ( 24 );
recvDecodingTables();
EOB = nInUse+1;
groupNo = -1;
groupPos = 0;
/*--
Setting up the unzftab entries here is not strictly
necessary, but it does save having to do it later
in a separate pass, and so saves a block's worth of
cache misses.
--*/
for (i = 0; i <= 255; i++) unzftab[i] = 0;
for (i = 0; i <= 255; i++) yy[i] = (UChar) i;
last = -1;
GET_MTF_VAL(nextSym);
while(True) {
if (nextSym == EOB) break;
if (nextSym == RUNA || nextSym == RUNB) {
UChar ch;
Int32 s = -1;
Int32 N = 1;
do {
if (nextSym == RUNA) s = s + (0+1) * N; else
if (nextSym == RUNB) s = s + (1+1) * N;
N = N * 2;
GET_MTF_VAL(nextSym);
}
while (nextSym == RUNA || nextSym == RUNB);
s++;
ch = seqToUnseq[yy[0]];
unzftab[ch] += s;
if (smallMode)
while (s > 0) {
last++;
ll16[last] = ch;
s--;
}
else
while (s > 0) {
last++;
ll8[last] = ch;
s--;
};
// if (last >= limitLast) blockOverrun();
continue;
}
else {
UChar tmp;
last++;// if (last >= limitLast) blockOverrun();
tmp = yy[nextSym-1];
unzftab[seqToUnseq[tmp]]++;
if (smallMode)
ll16[last] = seqToUnseq[tmp]; else
ll8[last] = seqToUnseq[tmp];
/*--
This loop is hammered during decompression,
hence the unrolling.
for (j = nextSym-1; j > 0; j--) yy[j] = yy[j-1];
--*/
j = nextSym-1;
for (; j > 3; j -= 4) {
yy[j] = yy[j-1];
yy[j-1] = yy[j-2];
yy[j-2] = yy[j-3];
yy[j-3] = yy[j-4];
}
for (; j > 0; j--) yy[j] = yy[j-1];
yy[0] = tmp;
GET_MTF_VAL(nextSym);
continue;
}
}
}
Bool fullGtU(Int32 i1, Int32 i2) {
Int32 k;
UChar c1, c2;
UInt16 s1, s2;
#if DEBUG
/*--
shellsort shouldn't ask to compare
something with itself.
--*/
assert (i1 != i2);
#endif
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
i1++; i2++;
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
i1++; i2++;
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
i1++; i2++;
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
i1++; i2++;
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
i1++; i2++;
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
i1++; i2++;
k = last + 1;
do {
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
s1 = quadrant[i1];
s2 = quadrant[i2];
if (s1 != s2) return (s1 > s2);
i1++; i2++;
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
s1 = quadrant[i1];
s2 = quadrant[i2];
if (s1 != s2) return (s1 > s2);
i1++; i2++;
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
s1 = quadrant[i1];
s2 = quadrant[i2];
if (s1 != s2) return (s1 > s2);
i1++; i2++;
c1 = block[i1];
c2 = block[i2];
if (c1 != c2) return (c1 > c2);
s1 = quadrant[i1];
s2 = quadrant[i2];
if (s1 != s2) return (s1 > s2);
i1++; i2++;
if (i1 > last) { i1 -= last; i1--; };
if (i2 > last) { i2 -= last; i2--; };
k -= 4;
workDone++;
}
while (k >= 0);
return False;
}
void simpleSort(Int32 lo, Int32 hi, Int32 d) {
Int32 i, j, h, bigN, hp;
Int32 v;
bigN = hi - lo + 1;
if (bigN < 2) return;
hp = 0;
while (incs[hp] < bigN) hp++;
hp--;
for (; hp >= 0; hp--) {
h = incs[hp];
i = lo + h;
while(True) {
/*-- copy 1 --*/
if (i > hi) break;
v = zptr[i];
j = i;
while ( fullGtU ( zptr[j-h]+d, v+d ) ) {
zptr[j] = zptr[j-h];
j = j - h;
if (j <= (lo + h - 1)) break;
}
zptr[j] = v;
i++;
/*-- copy 2 --*/
if (i > hi) break;
v = zptr[i];
j = i;
while ( fullGtU ( zptr[j-h]+d, v+d ) ) {
zptr[j] = zptr[j-h];
j = j - h;
if (j <= (lo + h - 1)) break;
}
zptr[j] = v;
i++;
/*-- copy 3 --*/
if (i > hi) break;
v = zptr[i];
j = i;
while ( fullGtU ( zptr[j-h]+d, v+d ) ) {
zptr[j] = zptr[j-h];
j = j - h;
if (j <= (lo + h - 1)) break;
}
zptr[j] = v;
i++;
if (workDone > workLimit && firstAttempt) return;
}
}
}
void vswap(Int32 p1, Int32 p2, Int32 n) {
while (n > 0) {
swap(zptr[p1], zptr[p2]);
p1++; p2++; n--;
}
}
UChar med3(UChar a, UChar b, UChar c) {
UChar t;
if (a > b) { t = a; a = b; b = t; };
if (b > c) { t = b; b = c; c = t; };
if (a > b) b = a;
return b;
}
void qSort3(Int32 loSt, Int32 hiSt, Int32 dSt) {
Int32 unLo, unHi, ltLo, gtHi, med, n, m;
Int32 sp, lo, hi, d;
StackElem stack[QSORT_STACK_SIZE];
sp = 0;
push ( loSt, hiSt, dSt );
while(sp > 0) {
pop ( lo, hi, d );
if (hi - lo < SMALL_THRESH || d > DEPTH_THRESH) {
simpleSort ( lo, hi, d );
if (workDone > workLimit && firstAttempt) return;
continue;
}
med = med3( block[zptr[ lo ]+d],
block[zptr[ hi ]+d],
block[zptr[ (lo+hi)>>1 ]+d] );
unLo = ltLo = lo;
unHi = gtHi = hi;
while(True) {
while(True) {
if (unLo > unHi) break;
n = ((Int32)block[zptr[unLo]+d]) - med;
if (n == 0) { swap(zptr[unLo], zptr[ltLo]); ltLo++; unLo++; continue; };
if (n > 0) break;
unLo++;
}
while(True) {
if (unLo > unHi) break;
n = ((Int32)block[zptr[unHi]+d]) - med;
if (n == 0) { swap(zptr[unHi], zptr[gtHi]); gtHi--; unHi--; continue; };
if (n < 0) break;
unHi--;
}
if (unLo > unHi) break;
swap(zptr[unLo], zptr[unHi]); unLo++; unHi--;
}
#if DEBUG
assert (unHi == unLo-1);
#endif
if (gtHi < ltLo) {
push(lo, hi, d+1 );
continue;
}
n = min(ltLo-lo, unLo-ltLo); vswap(lo, unLo-n, n);
m = min(hi-gtHi, gtHi-unHi); vswap(unLo, hi-m+1, m);
n = lo + unLo - ltLo - 1;
m = hi - (gtHi - unHi) + 1;
push ( lo, n, d );
push ( n+1, m-1, d+1 );
push ( m, hi, d );
}
}
void sortIt(void) {
Int32 i, j, ss, sb;
Int32 runningOrder[256];
Int32 copy[256];
Bool bigDone[256];
UChar c1, c2;
Int32 numQSorted;
/*--
In the various block-sized structures, live data runs
from 0 to last+NUM_OVERSHOOT_BYTES inclusive. First,
set up the overshoot area for block.
--*/
for (i = 0; i < NUM_OVERSHOOT_BYTES; i++)
block[last+i+1] = block[i % (last+1)];
for (i = 0; i <= last+NUM_OVERSHOOT_BYTES; i++)
quadrant[i] = 0;
block[-1] = block[last];
if(last < 4000) {
/*--
Use simpleSort(), since the full sorting mechanism
has quite a large constant overhead.
--*/
for (i = 0; i <= last; i++) zptr[i] = i;
firstAttempt = False;
workDone = workLimit = 0;
simpleSort ( 0, last, 0 );
}
else {
numQSorted = 0;
for (i = 0; i <= 255; i++) bigDone[i] = False;
for (i = 0; i <= 65536; i++) ftab[i] = 0;
c1 = block[-1];
for (i = 0; i <= last; i++) {
c2 = block[i];
ftab[(c1 << 8) + c2]++;
c1 = c2;
}
for (i = 1; i <= 65536; i++) ftab[i] += ftab[i-1];
c1 = block[0];
for (i = 0; i < last; i++) {
c2 = block[i+1];
j = (c1 << 8) + c2;
c1 = c2;
ftab[j]--;
zptr[ftab[j]] = i;
}
j = (block[last] << 8) + block[0];
ftab[j]--;
zptr[ftab[j]] = last;
/*--
Now ftab contains the first loc of every small bucket.
Calculate the running order, from smallest to largest
big bucket.
--*/
for (i = 0; i <= 255; i++) runningOrder[i] = i;
{
Int32 vv;
Int32 h = 1;
do h = 3 * h + 1; while (h <= 256);
do {
h = h / 3;
for (i = h; i <= 255; i++) {
vv = runningOrder[i];
j = i;
while ( BIGFREQ(runningOrder[j-h]) > BIGFREQ(vv) ) {
runningOrder[j] = runningOrder[j-h];
j = j - h;
if (j <= (h - 1)) goto zero;
}
zero:
runningOrder[j] = vv;
}
} while (h != 1);
}
/*--
The main sorting loop.
--*/
for (i = 0; i <= 255; i++) {
/*--
Process big buckets, starting with the least full.
--*/
ss = runningOrder[i];
/*--
Complete the big bucket [ss] by quicksorting
any unsorted small buckets [ss, j]. Hopefully
previous pointer-scanning phases have already
completed many of the small buckets [ss, j], so
we don't have to sort them at all.
--*/
for (j = 0; j <= 255; j++) {
sb = (ss << 8) + j;
if ( ! (ftab[sb] & SETMASK) ) {
Int32 lo = ftab[sb] & CLEARMASK;
Int32 hi = (ftab[sb+1] & CLEARMASK) - 1;
if (hi > lo) {
qSort3 ( lo, hi, 2 );
numQSorted += ( hi - lo + 1 );
if (workDone > workLimit && firstAttempt) return;
}
ftab[sb] |= SETMASK;
}
}
/*--
The ss big bucket is now done. Record this fact,
and update the quadrant descriptors. Remember to
update quadrants in the overshoot area too, if
necessary. The "if (i < 255)" test merely skips
this updating for the last bucket processed, since
updating for the last bucket is pointless.
--*/
bigDone[ss] = True;
if (i < 255) {
Int32 bbStart = ftab[ss << 8] & CLEARMASK;
Int32 bbSize = (ftab[(ss+1) << 8] & CLEARMASK) - bbStart;
Int32 shifts = 0;
while ((bbSize >> shifts) > 65534) shifts++;
for (j = 0; j < bbSize; j++) {
Int32 a2update = zptr[bbStart + j];
UInt16 qVal = (UInt16)(j >> shifts);
quadrant[a2update] = qVal;
if (a2update < NUM_OVERSHOOT_BYTES)
quadrant[a2update + last + 1] = qVal;
}
}
/*--
Now scan this big bucket so as to synthesise the
sorted order for small buckets [t, ss] for all t != ss.
--*/
for (j = 0; j <= 255; j++)
copy[j] = ftab[(j << 8) + ss] & CLEARMASK;
for (j = ftab[ss << 8] & CLEARMASK;
j < (ftab[(ss+1) << 8] & CLEARMASK);
j++) {
c1 = block[zptr[j]-1];
if ( ! bigDone[c1] ) {
zptr[copy[c1]] = zptr[j] == 0 ? last : zptr[j] - 1;
copy[c1] ++;
}
}
for (j = 0; j <= 255; j++) ftab[(j << 8) + ss] |= SETMASK;
}
}
}