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|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/dcl.h"
#include "common/debug.h"
#include "common/memstream.h"
#include "common/stream.h"
#include "common/textconsole.h"
namespace Common {
class DecompressorDCL {
public:
bool unpack(ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
protected:
/**
* Initialize decompressor.
* @param src source stream to read from
* @param dest destination stream to write to
* @param nPacked size of packed data
* @param nUnpacket size of unpacked data
* @return 0 on success, non-zero on error
*/
void init(ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked);
/**
* Get a number of bits from _src stream, starting with the least
* significant unread bit of the current four byte block.
* @param n number of bits to get
* @return n-bits number
*/
uint32 getBitsLSB(int n);
/**
* Get one byte from _src stream.
* @return byte
*/
byte getByteLSB();
void fetchBitsLSB();
/**
* Write one byte into _dest stream
* @param b byte to put
*/
void putByte(byte b);
int huffman_lookup(const int *tree);
uint32 _dwBits; ///< bits buffer
byte _nBits; ///< number of unread bits in _dwBits
uint32 _szPacked; ///< size of the compressed data
uint32 _szUnpacked; ///< size of the decompressed data
uint32 _dwRead; ///< number of bytes read from _src
uint32 _dwWrote; ///< number of bytes written to _dest
ReadStream *_src;
byte *_dest;
};
void DecompressorDCL::init(ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked) {
_src = src;
_dest = dest;
_szPacked = nPacked;
_szUnpacked = nUnpacked;
_nBits = 0;
_dwRead = _dwWrote = 0;
_dwBits = 0;
}
void DecompressorDCL::fetchBitsLSB() {
while (_nBits <= 24) {
_dwBits |= ((uint32)_src->readByte()) << _nBits;
_nBits += 8;
_dwRead++;
}
}
uint32 DecompressorDCL::getBitsLSB(int n) {
// fetching more data to buffer if needed
if (_nBits < n)
fetchBitsLSB();
uint32 ret = (_dwBits & ~((~0) << n));
_dwBits >>= n;
_nBits -= n;
return ret;
}
byte DecompressorDCL::getByteLSB() {
return getBitsLSB(8);
}
void DecompressorDCL::putByte(byte b) {
_dest[_dwWrote++] = b;
}
#define HUFFMAN_LEAF 0x40000000
// Branch node
#define BN(pos, left, right) ((left << 12) | (right)),
// Leaf node
#define LN(pos, value) ((value) | HUFFMAN_LEAF),
static const int length_tree[] = {
BN(0, 1, 2)
BN(1, 3, 4) BN(2, 5, 6)
BN(3, 7, 8) BN(4, 9, 10) BN(5, 11, 12) LN(6, 1)
BN(7, 13, 14) BN(8, 15, 16) BN(9, 17, 18) LN(10, 3) LN(11, 2) LN(12, 0)
BN(13, 19, 20) BN(14, 21, 22) BN(15, 23, 24) LN(16, 6) LN(17, 5) LN(18, 4)
BN(19, 25, 26) BN(20, 27, 28) LN(21, 10) LN(22, 9) LN(23, 8) LN(24, 7)
BN(25, 29, 30) LN(26, 13) LN(27, 12) LN(28, 11)
LN(29, 15) LN(30, 14)
0 // We need something witout a comma at the end
};
static const int distance_tree[] = {
BN(0, 1, 2)
BN(1, 3, 4) BN(2, 5, 6)
//
BN(3, 7, 8) BN(4, 9, 10) BN(5, 11, 12) LN(6, 0)
BN(7, 13, 14) BN(8, 15, 16) BN(9, 17, 18) BN(10, 19, 20)
BN(11, 21, 22) BN(12, 23, 24)
//
BN(13, 25, 26) BN(14, 27, 28) BN(15, 29, 30) BN(16, 31, 32)
BN(17, 33, 34) BN(18, 35, 36) BN(19, 37, 38) BN(20, 39, 40)
BN(21, 41, 42) BN(22, 43, 44) LN(23, 2) LN(24, 1)
//
BN(25, 45, 46) BN(26, 47, 48) BN(27, 49, 50) BN(28, 51, 52)
BN(29, 53, 54) BN(30, 55, 56) BN(31, 57, 58) BN(32, 59, 60)
BN(33, 61, 62) BN(34, 63, 64) BN(35, 65, 66) BN(36, 67, 68)
BN(37, 69, 70) BN(38, 71, 72) BN(39, 73, 74) BN(40, 75, 76)
LN(41, 6) LN(42, 5) LN(43, 4) LN(44, 3)
//
BN(45, 77, 78) BN(46, 79, 80) BN(47, 81, 82) BN(48, 83, 84)
BN(49, 85, 86) BN(50, 87, 88) BN(51, 89, 90) BN(52, 91, 92)
BN(53, 93, 94) BN(54, 95, 96) BN(55, 97, 98) BN(56, 99, 100)
BN(57, 101, 102) BN(58, 103, 104) BN(59, 105, 106) BN(60, 107, 108)
BN(61, 109, 110) LN(62, 21) LN(63, 20) LN(64, 19)
LN(65, 18) LN(66, 17) LN(67, 16) LN(68, 15)
LN(69, 14) LN(70, 13) LN(71, 12) LN(72, 11)
LN(73, 10) LN(74, 9) LN(75, 8) LN(76, 7)
//
BN(77, 111, 112) BN(78, 113, 114) BN(79, 115, 116) BN(80, 117, 118)
BN(81, 119, 120) BN(82, 121, 122) BN(83, 123, 124) BN(84, 125, 126)
LN(85, 47) LN(86, 46) LN(87, 45) LN(88, 44)
LN(89, 43) LN(90, 42) LN(91, 41) LN(92, 40)
LN(93, 39) LN(94, 38) LN(95, 37) LN(96, 36)
LN(97, 35) LN(98, 34) LN(99, 33) LN(100, 32)
LN(101, 31) LN(102, 30) LN(103, 29) LN(104, 28)
LN(105, 27) LN(106, 26) LN(107, 25) LN(108, 24)
LN(109, 23) LN(110, 22) LN(111, 63) LN(112, 62)
LN(113, 61) LN(114, 60) LN(115, 59) LN(116, 58)
LN(117, 57) LN(118, 56) LN(119, 55) LN(120, 54)
LN(121, 53) LN(122, 52) LN(123, 51) LN(124, 50)
LN(125, 49) LN(126, 48)
0 // We need something witout a comma at the end
};
static const int ascii_tree[] = {
BN(0, 1, 2) BN(1, 3, 4) BN(2, 5, 6) BN(3, 7, 8)
BN(4, 9, 10) BN(5, 11, 12) BN(6, 13, 14) BN(7, 15, 16)
BN(8, 17, 18) BN(9, 19, 20) BN(10, 21, 22) BN(11, 23, 24)
BN(12, 25, 26) BN(13, 27, 28) BN(14, 29, 30) BN(15, 31, 32)
BN(16, 33, 34) BN(17, 35, 36) BN(18, 37, 38) BN(19, 39, 40)
BN(20, 41, 42) BN(21, 43, 44) BN(22, 45, 46) BN(23, 47, 48)
BN(24, 49, 50) BN(25, 51, 52) BN(26, 53, 54) BN(27, 55, 56)
BN(28, 57, 58) BN(29, 59, 60) LN(30, 32)
//
BN(31, 61, 62) BN(32, 63, 64) BN(33, 65, 66) BN(34, 67, 68)
BN(35, 69, 70) BN(36, 71, 72) BN(37, 73, 74) BN(38, 75, 76)
BN(39, 77, 78) BN(40, 79, 80) BN(41, 81, 82) BN(42, 83, 84)
BN(43, 85, 86) BN(44, 87, 88) BN(45, 89, 90) BN(46, 91, 92)
BN(47, 93, 94) BN(48, 95, 96) BN(49, 97, 98) LN(50, 117)
LN(51, 116) LN(52, 115) LN(53, 114) LN(54, 111)
LN(55, 110) LN(56, 108) LN(57, 105) LN(58, 101)
LN(59, 97) LN(60, 69)
//
BN(61, 99, 100) BN(62, 101, 102) BN(63, 103, 104) BN(64, 105, 106)
BN(65, 107, 108) BN(66, 109, 110) BN(67, 111, 112) BN(68, 113, 114)
BN(69, 115, 116) BN(70, 117, 118) BN(71, 119, 120) BN(72, 121, 122)
BN(73, 123, 124) BN(74, 125, 126) BN(75, 127, 128) BN(76, 129, 130)
BN(77, 131, 132) BN(78, 133, 134) LN(79, 112) LN(80, 109)
LN(81, 104) LN(82, 103) LN(83, 102) LN(84, 100)
LN(85, 99) LN(86, 98) LN(87, 84) LN(88, 83)
LN(89, 82) LN(90, 79) LN(91, 78) LN(92, 76)
LN(93, 73) LN(94, 68) LN(95, 67) LN(96, 65)
LN(97, 49) LN(98, 45)
//
BN(99, 135, 136) BN(100, 137, 138) BN(101, 139, 140) BN(102, 141, 142)
BN(103, 143, 144) BN(104, 145, 146) BN(105, 147, 148) BN(106, 149, 150)
BN(107, 151, 152) BN(108, 153, 154) BN(109, 155, 156) BN(110, 157, 158)
BN(111, 159, 160) BN(112, 161, 162) BN(113, 163, 164) LN(114, 119)
LN(115, 107) LN(116, 85) LN(117, 80) LN(118, 77)
LN(119, 70) LN(120, 66) LN(121, 61) LN(122, 56)
LN(123, 55) LN(124, 53) LN(125, 52) LN(126, 51)
LN(127, 50) LN(128, 48) LN(129, 46) LN(130, 44)
LN(131, 41) LN(132, 40) LN(133, 13) LN(134, 10)
//
BN(135, 165, 166) BN(136, 167, 168) BN(137, 169, 170) BN(138, 171, 172)
BN(139, 173, 174) BN(140, 175, 176) BN(141, 177, 178) BN(142, 179, 180)
BN(143, 181, 182) BN(144, 183, 184) BN(145, 185, 186) BN(146, 187, 188)
BN(147, 189, 190) BN(148, 191, 192) LN(149, 121) LN(150, 120)
LN(151, 118) LN(152, 95) LN(153, 91) LN(154, 87)
LN(155, 72) LN(156, 71) LN(157, 58) LN(158, 57)
LN(159, 54) LN(160, 47) LN(161, 42) LN(162, 39)
LN(163, 34) LN(164, 9)
//
BN(165, 193, 194) BN(166, 195, 196) BN(167, 197, 198) BN(168, 199, 200)
BN(169, 201, 202) BN(170, 203, 204) BN(171, 205, 206) BN(172, 207, 208)
BN(173, 209, 210) BN(174, 211, 212) BN(175, 213, 214) BN(176, 215, 216)
BN(177, 217, 218) BN(178, 219, 220) BN(179, 221, 222) BN(180, 223, 224)
BN(181, 225, 226) BN(182, 227, 228) BN(183, 229, 230) BN(184, 231, 232)
BN(185, 233, 234) LN(186, 93) LN(187, 89) LN(188, 88)
LN(189, 86) LN(190, 75) LN(191, 62) LN(192, 43)
//
BN(193, 235, 236) BN(194, 237, 238) BN(195, 239, 240) BN(196, 241, 242)
BN(197, 243, 244) BN(198, 245, 246) BN(199, 247, 248) BN(200, 249, 250)
BN(201, 251, 252) BN(202, 253, 254) BN(203, 255, 256) BN(204, 257, 258)
BN(205, 259, 260) BN(206, 261, 262) BN(207, 263, 264) BN(208, 265, 266)
BN(209, 267, 268) BN(210, 269, 270) BN(211, 271, 272) BN(212, 273, 274)
BN(213, 275, 276) BN(214, 277, 278) BN(215, 279, 280) BN(216, 281, 282)
BN(217, 283, 284) BN(218, 285, 286) BN(219, 287, 288) BN(220, 289, 290)
BN(221, 291, 292) BN(222, 293, 294) BN(223, 295, 296) BN(224, 297, 298)
BN(225, 299, 300) BN(226, 301, 302) BN(227, 303, 304) BN(228, 305, 306)
BN(229, 307, 308) LN(230, 122) LN(231, 113) LN(232, 38)
LN(233, 36) LN(234, 33)
//
BN(235, 309, 310) BN(236, 311, 312) BN(237, 313, 314) BN(238, 315, 316)
BN(239, 317, 318) BN(240, 319, 320) BN(241, 321, 322) BN(242, 323, 324)
BN(243, 325, 326) BN(244, 327, 328) BN(245, 329, 330) BN(246, 331, 332)
BN(247, 333, 334) BN(248, 335, 336) BN(249, 337, 338) BN(250, 339, 340)
BN(251, 341, 342) BN(252, 343, 344) BN(253, 345, 346) BN(254, 347, 348)
BN(255, 349, 350) BN(256, 351, 352) BN(257, 353, 354) BN(258, 355, 356)
BN(259, 357, 358) BN(260, 359, 360) BN(261, 361, 362) BN(262, 363, 364)
BN(263, 365, 366) BN(264, 367, 368) BN(265, 369, 370) BN(266, 371, 372)
BN(267, 373, 374) BN(268, 375, 376) BN(269, 377, 378) BN(270, 379, 380)
BN(271, 381, 382) BN(272, 383, 384) BN(273, 385, 386) BN(274, 387, 388)
BN(275, 389, 390) BN(276, 391, 392) BN(277, 393, 394) BN(278, 395, 396)
BN(279, 397, 398) BN(280, 399, 400) BN(281, 401, 402) BN(282, 403, 404)
BN(283, 405, 406) BN(284, 407, 408) BN(285, 409, 410) BN(286, 411, 412)
BN(287, 413, 414) BN(288, 415, 416) BN(289, 417, 418) BN(290, 419, 420)
BN(291, 421, 422) BN(292, 423, 424) BN(293, 425, 426) BN(294, 427, 428)
BN(295, 429, 430) BN(296, 431, 432) BN(297, 433, 434) BN(298, 435, 436)
LN(299, 124) LN(300, 123) LN(301, 106) LN(302, 92)
LN(303, 90) LN(304, 81) LN(305, 74) LN(306, 63)
LN(307, 60) LN(308, 0)
//
BN(309, 437, 438) BN(310, 439, 440) BN(311, 441, 442) BN(312, 443, 444)
BN(313, 445, 446) BN(314, 447, 448) BN(315, 449, 450) BN(316, 451, 452)
BN(317, 453, 454) BN(318, 455, 456) BN(319, 457, 458) BN(320, 459, 460)
BN(321, 461, 462) BN(322, 463, 464) BN(323, 465, 466) BN(324, 467, 468)
BN(325, 469, 470) BN(326, 471, 472) BN(327, 473, 474) BN(328, 475, 476)
BN(329, 477, 478) BN(330, 479, 480) BN(331, 481, 482) BN(332, 483, 484)
BN(333, 485, 486) BN(334, 487, 488) BN(335, 489, 490) BN(336, 491, 492)
BN(337, 493, 494) BN(338, 495, 496) BN(339, 497, 498) BN(340, 499, 500)
BN(341, 501, 502) BN(342, 503, 504) BN(343, 505, 506) BN(344, 507, 508)
BN(345, 509, 510) LN(346, 244) LN(347, 243) LN(348, 242)
LN(349, 238) LN(350, 233) LN(351, 229) LN(352, 225)
LN(353, 223) LN(354, 222) LN(355, 221) LN(356, 220)
LN(357, 219) LN(358, 218) LN(359, 217) LN(360, 216)
LN(361, 215) LN(362, 214) LN(363, 213) LN(364, 212)
LN(365, 211) LN(366, 210) LN(367, 209) LN(368, 208)
LN(369, 207) LN(370, 206) LN(371, 205) LN(372, 204)
LN(373, 203) LN(374, 202) LN(375, 201) LN(376, 200)
LN(377, 199) LN(378, 198) LN(379, 197) LN(380, 196)
LN(381, 195) LN(382, 194) LN(383, 193) LN(384, 192)
LN(385, 191) LN(386, 190) LN(387, 189) LN(388, 188)
LN(389, 187) LN(390, 186) LN(391, 185) LN(392, 184)
LN(393, 183) LN(394, 182) LN(395, 181) LN(396, 180)
LN(397, 179) LN(398, 178) LN(399, 177) LN(400, 176)
LN(401, 127) LN(402, 126) LN(403, 125) LN(404, 96)
LN(405, 94) LN(406, 64) LN(407, 59) LN(408, 37)
LN(409, 35) LN(410, 31) LN(411, 30) LN(412, 29)
LN(413, 28) LN(414, 27) LN(415, 25) LN(416, 24)
LN(417, 23) LN(418, 22) LN(419, 21) LN(420, 20)
LN(421, 19) LN(422, 18) LN(423, 17) LN(424, 16)
LN(425, 15) LN(426, 14) LN(427, 12) LN(428, 11)
LN(429, 8) LN(430, 7) LN(431, 6) LN(432, 5)
LN(433, 4) LN(434, 3) LN(435, 2) LN(436, 1)
LN(437, 255) LN(438, 254) LN(439, 253) LN(440, 252)
LN(441, 251) LN(442, 250) LN(443, 249) LN(444, 248)
LN(445, 247) LN(446, 246) LN(447, 245) LN(448, 241)
LN(449, 240) LN(450, 239) LN(451, 237) LN(452, 236)
LN(453, 235) LN(454, 234) LN(455, 232) LN(456, 231)
LN(457, 230) LN(458, 228) LN(459, 227) LN(460, 226)
LN(461, 224) LN(462, 175) LN(463, 174) LN(464, 173)
LN(465, 172) LN(466, 171) LN(467, 170) LN(468, 169)
LN(469, 168) LN(470, 167) LN(471, 166) LN(472, 165)
LN(473, 164) LN(474, 163) LN(475, 162) LN(476, 161)
LN(477, 160) LN(478, 159) LN(479, 158) LN(480, 157)
LN(481, 156) LN(482, 155) LN(483, 154) LN(484, 153)
LN(485, 152) LN(486, 151) LN(487, 150) LN(488, 149)
LN(489, 148) LN(490, 147) LN(491, 146) LN(492, 145)
LN(493, 144) LN(494, 143) LN(495, 142) LN(496, 141)
LN(497, 140) LN(498, 139) LN(499, 138) LN(500, 137)
LN(501, 136) LN(502, 135) LN(503, 134) LN(504, 133)
LN(505, 132) LN(506, 131) LN(507, 130) LN(508, 129)
LN(509, 128) LN(510, 26)
};
int DecompressorDCL::huffman_lookup(const int *tree) {
int pos = 0;
while (!(tree[pos] & HUFFMAN_LEAF)) {
int bit = getBitsLSB(1);
debug(8, "[%d]:%d->", pos, bit);
pos = bit ? tree[pos] & 0xFFF : tree[pos] >> 12;
}
debug(8, "=%02x\n", tree[pos] & 0xffff);
return tree[pos] & 0xFFFF;
}
#define DCL_BINARY_MODE 0
#define DCL_ASCII_MODE 1
bool DecompressorDCL::unpack(ReadStream *src, byte *dest, uint32 nPacked, uint32 nUnpacked) {
init(src, dest, nPacked, nUnpacked);
int value;
uint32 val_distance, val_length;
int mode = getByteLSB();
int length_param = getByteLSB();
if (mode != DCL_BINARY_MODE && mode != DCL_ASCII_MODE) {
warning("DCL-INFLATE: Error: Encountered mode %02x, expected 00 or 01", mode);
return false;
}
if (length_param < 3 || length_param > 6)
warning("Unexpected length_param value %d (expected in [3,6])", length_param);
while (_dwWrote < _szUnpacked) {
if (getBitsLSB(1)) { // (length,distance) pair
value = huffman_lookup(length_tree);
if (value < 8)
val_length = value + 2;
else
val_length = 8 + (1 << (value - 7)) + getBitsLSB(value - 7);
debug(8, " | ");
value = huffman_lookup(distance_tree);
if (val_length == 2)
val_distance = (value << 2) | getBitsLSB(2);
else
val_distance = (value << length_param) | getBitsLSB(length_param);
val_distance ++;
debug(8, "\nCOPY(%d from %d)\n", val_length, val_distance);
if (val_length + _dwWrote > _szUnpacked) {
warning("DCL-INFLATE Error: Write out of bounds while copying %d bytes", val_length);
return false;
}
if (_dwWrote < val_distance) {
warning("DCL-INFLATE Error: Attempt to copy from before beginning of input stream");
return false;
}
while (val_length) {
uint32 copy_length = (val_length > val_distance) ? val_distance : val_length;
assert(val_distance >= copy_length);
uint32 pos = _dwWrote - val_distance;
for (uint32 i = 0; i < copy_length; i++)
putByte(dest[pos + i]);
for (uint32 i = 0; i < copy_length; i++)
debug(9, "\33[32;31m%02x\33[37;37m ", dest[pos + i]);
debug(9, "\n");
val_length -= copy_length;
val_distance += copy_length;
}
} else { // Copy byte verbatim
value = (mode == DCL_ASCII_MODE) ? huffman_lookup(ascii_tree) : getByteLSB();
putByte(value);
debug(9, "\33[32;31m%02x \33[37;37m", value);
}
}
return _dwWrote == _szUnpacked;
}
bool decompressDCL(ReadStream *src, byte *dest, uint32 packedSize, uint32 unpackedSize) {
if (!src || !dest)
return false;
DecompressorDCL dcl;
return dcl.unpack(src, dest, packedSize, unpackedSize);
}
SeekableReadStream *decompressDCL(ReadStream *src, uint32 packedSize, uint32 unpackedSize) {
byte *data = (byte *)malloc(unpackedSize);
if (decompressDCL(src, data, packedSize, unpackedSize))
return new MemoryReadStream(data, unpackedSize, DisposeAfterUse::YES);
free(data);
return 0;
}
} // End of namespace Common
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