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|
/*
* huffman.c -- functions do decompress files in mpq files which
* uses a modified huffman version.
*
* Copyright (c) 2003-2008 Maik Broemme <mbroemme@plusserver.de>
*
* Differences between C++ and C version:
*
* - Removed the object oriented stuff.
* - Replaced the goto things with some better C code.
*
* This source was adepted from the C++ version of huffman.cpp included
* in stormlib. The C++ version belongs to the following authors:
*
* Ladislav Zezula <ladik@zezula.net>
* ShadowFlare <BlakFlare@hotmail.com>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* generic includes. */
#include <stdlib.h>
#include <string.h>
/* libmpq main includes. */
#include "mpq.h"
#include "mpq-internal.h"
/* libmpq generic includes. */
#include "huffman.h"
/* tables for huffman tree. */
static const uint8_t table_1502A630[] = {
/* data for compression type 0x00. */
0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
0x00, 0x00,
/* data for compression type 0x01. */
0x54, 0x16, 0x16, 0x0D, 0x0C, 0x08, 0x06, 0x05, 0x06, 0x05, 0x06, 0x03, 0x04, 0x04, 0x03, 0x05,
0x0E, 0x0B, 0x14, 0x13, 0x13, 0x09, 0x0B, 0x06, 0x05, 0x04, 0x03, 0x02, 0x03, 0x02, 0x02, 0x02,
0x0D, 0x07, 0x09, 0x06, 0x06, 0x04, 0x03, 0x02, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03, 0x02, 0x02,
0x09, 0x06, 0x04, 0x04, 0x04, 0x04, 0x03, 0x02, 0x03, 0x02, 0x02, 0x02, 0x02, 0x03, 0x02, 0x04,
0x08, 0x03, 0x04, 0x07, 0x09, 0x05, 0x03, 0x03, 0x03, 0x03, 0x02, 0x02, 0x02, 0x03, 0x02, 0x02,
0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x02, 0x01, 0x02, 0x02,
0x06, 0x0A, 0x08, 0x08, 0x06, 0x07, 0x04, 0x03, 0x04, 0x04, 0x02, 0x02, 0x04, 0x02, 0x03, 0x03,
0x04, 0x03, 0x07, 0x07, 0x09, 0x06, 0x04, 0x03, 0x03, 0x02, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02,
0x0A, 0x02, 0x02, 0x03, 0x02, 0x02, 0x01, 0x01, 0x02, 0x02, 0x02, 0x06, 0x03, 0x05, 0x02, 0x03,
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x03, 0x01, 0x01, 0x01,
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x04, 0x04, 0x04, 0x07, 0x09, 0x08, 0x0C, 0x02,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x03,
0x04, 0x01, 0x02, 0x04, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01,
0x04, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x01, 0x01, 0x02, 0x02, 0x02, 0x06, 0x4B,
0x00, 0x00,
/* data for compression type 0x02. */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x27, 0x00, 0x00, 0x23, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xFF, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x01, 0x01, 0x06, 0x0E, 0x10, 0x04,
0x06, 0x08, 0x05, 0x04, 0x04, 0x03, 0x03, 0x02, 0x02, 0x03, 0x03, 0x01, 0x01, 0x02, 0x01, 0x01,
0x01, 0x04, 0x02, 0x04, 0x02, 0x02, 0x02, 0x01, 0x01, 0x04, 0x01, 0x01, 0x02, 0x03, 0x03, 0x02,
0x03, 0x01, 0x03, 0x06, 0x04, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x02, 0x01, 0x01,
0x01, 0x29, 0x07, 0x16, 0x12, 0x40, 0x0A, 0x0A, 0x11, 0x25, 0x01, 0x03, 0x17, 0x10, 0x26, 0x2A,
0x10, 0x01, 0x23, 0x23, 0x2F, 0x10, 0x06, 0x07, 0x02, 0x09, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00,
/* data for compression type 0x03. */
0xFF, 0x0B, 0x07, 0x05, 0x0B, 0x02, 0x02, 0x02, 0x06, 0x02, 0x02, 0x01, 0x04, 0x02, 0x01, 0x03,
0x09, 0x01, 0x01, 0x01, 0x03, 0x04, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01,
0x05, 0x01, 0x01, 0x01, 0x0D, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x02, 0x01, 0x01, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01,
0x0A, 0x04, 0x02, 0x01, 0x06, 0x03, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x01,
0x05, 0x02, 0x03, 0x04, 0x03, 0x03, 0x03, 0x02, 0x01, 0x01, 0x01, 0x02, 0x01, 0x02, 0x03, 0x03,
0x01, 0x03, 0x01, 0x01, 0x02, 0x05, 0x01, 0x01, 0x04, 0x03, 0x05, 0x01, 0x03, 0x01, 0x03, 0x03,
0x02, 0x01, 0x04, 0x03, 0x0A, 0x06, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x02, 0x02, 0x01, 0x0A, 0x02, 0x05, 0x01, 0x01, 0x02, 0x07, 0x02, 0x17, 0x01, 0x05, 0x01, 0x01,
0x0E, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x06, 0x02, 0x01, 0x04, 0x05, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x07, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01,
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x11,
0x00, 0x00,
/* data for compression type 0x04. */
0xFF, 0xFB, 0x98, 0x9A, 0x84, 0x85, 0x63, 0x64, 0x3E, 0x3E, 0x22, 0x22, 0x13, 0x13, 0x18, 0x17,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00,
/* data for compression type 0x05. */
0xFF, 0xF1, 0x9D, 0x9E, 0x9A, 0x9B, 0x9A, 0x97, 0x93, 0x93, 0x8C, 0x8E, 0x86, 0x88, 0x80, 0x82,
0x7C, 0x7C, 0x72, 0x73, 0x69, 0x6B, 0x5F, 0x60, 0x55, 0x56, 0x4A, 0x4B, 0x40, 0x41, 0x37, 0x37,
0x2F, 0x2F, 0x27, 0x27, 0x21, 0x21, 0x1B, 0x1C, 0x17, 0x17, 0x13, 0x13, 0x10, 0x10, 0x0D, 0x0D,
0x0B, 0x0B, 0x09, 0x09, 0x08, 0x08, 0x07, 0x07, 0x06, 0x05, 0x05, 0x04, 0x04, 0x04, 0x19, 0x18,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00,
/* data for compression type 0x06. */
0xC3, 0xCB, 0xF5, 0x41, 0xFF, 0x7B, 0xF7, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xBF, 0xCC, 0xF2, 0x40, 0xFD, 0x7C, 0xF7, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x7A, 0x46, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00,
/* data for compression type 0x07. */
0xC3, 0xD9, 0xEF, 0x3D, 0xF9, 0x7C, 0xE9, 0x1E, 0xFD, 0xAB, 0xF1, 0x2C, 0xFC, 0x5B, 0xFE, 0x17,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xBD, 0xD9, 0xEC, 0x3D, 0xF5, 0x7D, 0xE8, 0x1D, 0xFB, 0xAE, 0xF0, 0x2C, 0xFB, 0x5C, 0xFF, 0x18,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x70, 0x6C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00,
/* data for compression type 0x08. */
0xBA, 0xC5, 0xDA, 0x33, 0xE3, 0x6D, 0xD8, 0x18, 0xE5, 0x94, 0xDA, 0x23, 0xDF, 0x4A, 0xD1, 0x10,
0xEE, 0xAF, 0xE4, 0x2C, 0xEA, 0x5A, 0xDE, 0x15, 0xF4, 0x87, 0xE9, 0x21, 0xF6, 0x43, 0xFC, 0x12,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xB0, 0xC7, 0xD8, 0x33, 0xE3, 0x6B, 0xD6, 0x18, 0xE7, 0x95, 0xD8, 0x23, 0xDB, 0x49, 0xD0, 0x11,
0xE9, 0xB2, 0xE2, 0x2B, 0xE8, 0x5C, 0xDD, 0x15, 0xF1, 0x87, 0xE7, 0x20, 0xF7, 0x44, 0xFF, 0x13,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x5F, 0x9E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00
};
/* this function insert an item to a huffman tree. */
void libmpq__huffman_insert_item(struct huffman_tree_item_s **p_item, struct huffman_tree_item_s *item, uint32_t where, struct huffman_tree_item_s *item2) {
/* EDI - next to the first item. */
struct huffman_tree_item_s *next = item->next;
/* ESI - prev to the first item. */
struct huffman_tree_item_s *prev = item->prev;
/* pointer to previous item. */
struct huffman_tree_item_s *prev2;
/* pointer to next item. */
long next2;
/* check the first item already has next one. */
if (next != 0) {
/* check if previous item exist. */
if (PTR_INT(prev) < 0) {
/* return previous item. */
prev = PTR_NOT(prev);
} else {
/* add item. */
prev += (item - next->prev);
}
/* 150083C1 - remove the item from the tree. */
prev->next = next;
next->prev = prev;
/* invalidate prev and next pointer. */
item->next = 0;
item->prev = 0;
}
/* EDX - check if the second item is not entered. */
if (item2 == NULL) {
/* take the first tree item. */
item2 = PTR_PTR(&p_item[1]);
}
/* check if items should be switched or new one inserted. */
switch (where) {
case SWITCH_ITEMS:
/* item2->next (pointer to pointer to first). */
item->next = item2->next;
item->prev = item2->next->prev;
item2->next->prev = item;
/* set the first item. */
item2->next = item;
/* return from function. */
return;
case INSERT_ITEM:
/* set next item (or pointer to pointer to first item) - insert as last item. */
item->next = item2;
/* set previous item (or last item in the tree). */
item->prev = item2->prev;
/* usually NULL. */
next2 = PTR_INT(p_item[0]);
/* previous item to the second (or last tree item). */
prev2 = item2->prev;
/* check if previous item is a valid pointer. */
if (PTR_INT(prev2) < 0) {
/* set values. */
prev2 = PTR_NOT(prev);
prev2->next = item;
/* next after last item. */
item2->prev = item;
/* return from function. */
return;
}
/* check if next item is empty. */
if (next2 < 0) {
/* set next item. */
next2 = item2 - item2->next->prev;
}
/* add next item to previous one. */
prev2 += next2;
prev2->next = item;
/* set the next and last item. */
item2->prev = item;
/* return from function. */
return;
default:
/* nothing to do, so return from function. */
return;
}
}
/* 1500BC90 - remove item from huffman tree.*/
void libmpq__huffman_remove_item(struct huffman_tree_item_s *hi) {
/* EDX - some common variables. */
struct huffman_tree_item_s *temp;
/* check if next item is not empty. */
if (hi->next != NULL) {
/* fetch previous item. */
temp = hi->prev;
/* check if previous item is a pointer. */
if (PTR_INT(temp) <= 0) {
temp = PTR_NOT(temp);
} else {
temp += (hi - hi->next->prev);
}
/* reorganize tree. */
temp->next = hi->next;
hi->next->prev = hi->prev;
hi->next = hi->prev = NULL;
}
}
/* get previous huffman tree item. */
struct huffman_tree_item_s *libmpq__huffman_previous_item(struct huffman_tree_item_s *hi, long value) {
/* check if previous item exist. */
if (PTR_INT(hi->prev) < 0) {
/* return previous item. */
return PTR_NOT(hi->prev);
}
/* check if something else should returned. */
if (value < 0) {
/* fetch previous item of next item. */
value = hi - hi->next->prev;
}
/* return previous item with value. */
return hi->prev + value;
}
/* get one bit from input stream. */
uint32_t libmpq__huffman_get_1bit(struct huffman_input_stream_s *is) {
/* some common variables. */
uint32_t bit = (is->bit_buf & 1);
/* shift bit right by one. */
is->bit_buf >>= 1;
/* check if we should extract bits. */
if (--is->bits == 0) {
is->bit_buf = *(uint32_t *)is->in_buf;
is->in_buf += sizeof(int32_t);
is->bits = 32;
}
/* return the bit. */
return bit;
}
/* get 7 bits from the input stream. */
uint32_t libmpq__huffman_get_7bit(struct huffman_input_stream_s *is) {
/* check if we should extract bits. */
if (is->bits <= 7) {
is->bit_buf |= *(uint16_t *)is->in_buf << is->bits;
is->in_buf += sizeof(int16_t);
is->bits += 16;
}
/* get 7 bits from input stream. */
return (is->bit_buf & 0x7F);
}
/* get the whole byte from the input stream. */
uint32_t libmpq__huffman_get_8bit(struct huffman_input_stream_s *is) {
/* some common variables. */
uint32_t one_byte;
/* check if we should extract bits. */
if (is->bits <= 8) {
is->bit_buf |= *(uint16_t *)is->in_buf << is->bits;
is->in_buf += sizeof(int16_t);
is->bits += 16;
}
/* fill values. */
one_byte = (is->bit_buf & 0xFF);
is->bit_buf >>= 8;
is->bits -= 8;
/* return the 8 bits. */
return one_byte;
}
/* return struct for 1500E740. */
struct huffman_tree_item_s *libmpq__huffman_call_1500E740(struct huffman_tree_s *ht) {
/* EDX */
struct huffman_tree_item_s *p_item1 = ht->item3058;
/* EAX */
struct huffman_tree_item_s *p_item2;
/* some common variables. */
struct huffman_tree_item_s *p_next;
struct huffman_tree_item_s *p_prev;
struct huffman_tree_item_s **pp_item;
/* check if item is empty. */
if (PTR_INT(p_item1) <= 0 || (p_item2 = p_item1) == NULL) {
/* check if item is not empty. */
if ((p_item2 = &ht->items0008[ht->items++]) != NULL) {
p_item1 = p_item2;
} else {
p_item1 = ht->first;
}
} else {
p_item1 = p_item2;
}
/* set next item. */
p_next = p_item1->next;
/* check if next item is not empty. */
if (p_next != NULL) {
/* set previous item. */
p_prev = p_item1->prev;
/* check if previous item is a valid pointer. */
if (PTR_INT(p_prev) <= 0) {
p_prev = PTR_NOT(p_prev);
} else {
p_prev += (p_item1 - p_item1->next->prev);
}
/* fill values. */
p_prev->next = p_next;
p_next->prev = p_prev;
p_item1->next = NULL;
p_item1->prev = NULL;
}
/* ESI */
pp_item = &ht->first;
p_item1->next = (struct huffman_tree_item_s *)pp_item;
p_item1->prev = pp_item[1];
/* EDI = ht->item305C - ECX */
p_prev = pp_item[1];
/* check if previous pointer is valid. */
if (p_prev <= 0) {
/* fill values. */
p_prev = PTR_NOT(p_prev);
p_prev->next = p_item1;
p_prev->prev = p_item2;
p_item2->parent = NULL;
p_item2->child = NULL;
} else {
/* check if pointer is valid. */
if (PTR_INT(ht->item305C) < 0) {
p_prev += (struct huffman_tree_item_s *)pp_item - (*pp_item)->prev;
} else {
p_prev += PTR_INT(ht->item305C);
}
/* fill values. */
p_prev->next = p_item1;
pp_item[1] = p_item2;
p_item2->parent = NULL;
p_item2->child = NULL;
}
/* return item. */
return p_item2;
}
/* return struct for 1500E820. */
void libmpq__huffman_call_1500E820(struct huffman_tree_s *ht, struct huffman_tree_item_s *p_item) {
/* EDI */
struct huffman_tree_item_s *p_item1;
/* EAX */
struct huffman_tree_item_s *p_item2 = NULL;
/* EDX */
struct huffman_tree_item_s *p_item3;
/* EBX */
struct huffman_tree_item_s *p_prev;
/* loop through parent items. */
for (; p_item != NULL; p_item = p_item->parent) {
/* increase byte counter. */
p_item->byte_value++;
/* loop through previous items. */
for (p_item1 = p_item; ; p_item1 = p_prev) {
/* set previous item. */
p_prev = p_item1->prev;
/* check if pointer is valid. */
if (PTR_INT(p_prev) <= 0) {
p_prev = NULL;
break;
}
/* check if byte value of previous item is higher than actual item. */
if (p_prev->byte_value >= p_item->byte_value) {
break;
}
}
/* check if previous item is same like actual item. */
if (p_item1 == p_item) {
continue;
}
/* check if next item is not empty, */
if (p_item1->next != NULL) {
/* fill values. */
p_item2 = libmpq__huffman_previous_item(p_item1, -1);
p_item2->next = p_item1->next;
p_item1->next->prev = p_item1->prev;
p_item1->next = NULL;
p_item1->prev = NULL;
}
/* fill values. */
p_item2 = p_item->next;
p_item1->next = p_item2;
p_item1->prev = p_item2->prev;
p_item2->prev = p_item1;
p_item->next = p_item1;
/* check if both items are not empty. */
if ((p_item2 = p_item1) != NULL) {
/* fill values. */
p_item2 = libmpq__huffman_previous_item(p_item, -1);
p_item2->next = p_item->next;
p_item->next->prev = p_item->prev;
p_item->next = NULL;
p_item->prev = NULL;
}
/* check if previous item is empty. */
if (p_prev == NULL) {
p_prev = PTR_PTR(&ht->first);
}
/* fill values. */
p_item2 = p_prev->next;
p_item->next = p_item2;
p_item->prev = p_item2->prev;
p_item2->prev = p_item;
p_prev->next = p_item;
p_item3 = p_item1->parent->child;
p_item2 = p_item->parent;
/* check if child item and parent item match. */
if (p_item2->child == p_item) {
p_item2->child = p_item1;
}
/* check if items match. */
if (p_item3 == p_item1) {
p_item1->parent->child = p_item;
}
/* fill values. */
p_item2 = p_item->parent;
p_item->parent = p_item1->parent;
p_item1->parent = p_item2;
/* increase counter. */
ht->offs0004++;
}
}
/* this function initialize a huffman tree. */
void libmpq__huffman_tree_init(struct huffman_tree_s *ht, uint32_t cmp) {
/* some common variables. */
uint32_t count;
struct huffman_tree_item_s *hi;
/* clear links for all the items in the tree. */
for (hi = ht->items0008, count = 0x203; count != 0; hi++, count--) {
hi->next = hi->prev = NULL;
}
/* fill values. */
ht->item3050 = NULL;
ht->item3054 = PTR_PTR(&ht->item3054);
ht->item3058 = PTR_NOT(ht->item3054);
ht->item305C = NULL;
ht->first = PTR_PTR(&ht->first);
ht->last = PTR_NOT(ht->first);
ht->offs0004 = 1;
ht->items = 0;
/* clear all huffman decompress items, do this only if preparing for decompression. */
if (cmp == LIBMPQ_HUFF_DECOMPRESS) {
for (count = 0; count < sizeof(ht->qd3474) / sizeof(struct huffman_decompress_s); count++) {
ht->qd3474[count].offs00 = 0;
}
}
}
/* this function build a huffman tree, called with the first 8 bits loaded from input stream. */
void libmpq__huffman_tree_build(struct huffman_tree_s *ht, uint32_t cmp_type) {
/* [ESP+10] - the greatest character found in table. */
uint32_t max_byte;
/* [ESP+1C] - pointer to uint8_t in table_1502A630. */
const uint8_t *byte_array;
/* thats needed to replace the goto stuff from original source. :) */
uint32_t found;
/* [ESP+14] - Pointer to Huffman tree item pointer array. */
struct huffman_tree_item_s **p_item;
struct huffman_tree_item_s *child1;
/* some common variables. */
uint32_t i;
/* ESI - loop while pointer has a negative value (last entry). */
while (PTR_INT(ht->last) > 0) {
/* EAX */
struct huffman_tree_item_s *temp;
/* ESI->next */
if (ht->last->next != NULL) {
libmpq__huffman_remove_item(ht->last);
}
/* [EDI+4] */
ht->item3058 = PTR_PTR(&ht->item3054);
/* EAX */
ht->last->prev = ht->item3058;
temp = libmpq__huffman_previous_item(PTR_PTR(&ht->item3054), PTR_INT(&ht->item3050));
temp->next = ht->last;
ht->item3054 = ht->last;
}
/* clear all pointers in huffman tree item array. */
memset(ht->items306C, 0, sizeof(ht->items306C));
/* greatest character found init to zero. */
max_byte = 0;
/* pointer to current entry in huffman tree item pointer array. */
p_item = (struct huffman_tree_item_s **)&ht->items306C;
/* ensure we have low 8 bits only. */
cmp_type &= 0xFF;
/* EDI also. */
byte_array = table_1502A630 + cmp_type * 258;
/* loop to build huffman tree. */
for (i = 0; i < 0x100; i++, p_item++) {
/* item to be created. */
struct huffman_tree_item_s *item = ht->item3058;
struct huffman_tree_item_s *p_item3 = ht->item3058;
uint8_t one_byte = byte_array[i];
/* skip all the bytes which are zero. */
if (byte_array[i] == 0) {
continue;
}
/* if not valid pointer, take the first available item in the array. */
if (PTR_INT(item) <= 0) {
item = &ht->items0008[ht->items++];
}
/* insert this item as the top of the tree. */
libmpq__huffman_insert_item(&ht->item305C, item, SWITCH_ITEMS, NULL);
/* invalidate child and parent. */
item->parent = NULL;
item->child = NULL;
/* store pointer into pointer array. */
*p_item = item;
/* store counter. */
item->dcmp_byte = i;
/* store byte value. */
item->byte_value = one_byte;
/* check if byte is to big. */
if (one_byte >= max_byte) {
/* set max byte to highest value. */
max_byte = one_byte;
/* continue loop. */
continue;
}
/* find the first item which has byte value greater than current one byte. */
found = 0;
/* EDI - Pointer to the last item. */
if (PTR_INT((p_item3 = ht->last)) > 0) {
/* 15006AF7 */
if (p_item3 != NULL) {
/* 15006AFB */
do {
/* check if we found item. */
if (p_item3->byte_value >= one_byte) {
found = 1;
break;
}
/* switch to previous item. */
p_item3 = p_item3->prev;
} while (PTR_INT(p_item3) > 0);
}
}
/* check if item was not found. */
if (found == 0) {
p_item3 = NULL;
}
/* 15006B09 */
if (item->next != NULL) {
libmpq__huffman_remove_item(item);
}
/* 15006B15 */
if (p_item3 == NULL) {
p_item3 = PTR_PTR(&ht->first);
}
/* 15006B1F */
item->next = p_item3->next;
item->prev = p_item3->next->prev;
p_item3->next->prev = item;
p_item3->next = item;
}
/* 15006B4A */
for (; i < 0x102; i++) {
/* EDI */
struct huffman_tree_item_s **p_item2 = &ht->items306C[i];
/* 15006B59 - ESI */
struct huffman_tree_item_s *item2 = ht->item3058;
/* check if item is a valid pointer. */
if (PTR_INT(item2) <= 0) {
item2 = &ht->items0008[ht->items++];
}
/* insert the item into tree. */
libmpq__huffman_insert_item(&ht->item305C, item2, INSERT_ITEM, NULL);
/* 15006B89 */
item2->dcmp_byte = i;
item2->byte_value = 1;
item2->parent = NULL;
item2->child = NULL;
*p_item2++ = item2;
}
/* 15006BAA - EDI - last item (first child to item). */
if (PTR_INT((child1 = ht->last)) > 0) {
/* EBP */
struct huffman_tree_item_s *child2;
/* ESI */
struct huffman_tree_item_s *item;
/* 15006BB8 */
while (PTR_INT((child2 = child1->prev)) > 0) {
if (PTR_INT((item = ht->item3058)) <= 0) {
item = &ht->items0008[ht->items++];
}
/* 15006BE3 */
libmpq__huffman_insert_item(&ht->item305C, item, SWITCH_ITEMS, NULL);
/* 15006BF3 */
item->parent = NULL;
item->child = NULL;
/*
* EDX = child2->byte_value + child1->byte_value;
* EAX = child1->byte_value;
* ECX = max_byte; (the greatest character (0xFF usually))
* item->byte_value (0x02 usually)
*/
item->byte_value = child1->byte_value + child2->byte_value;
/* previous item in the tree. */
item->child = child1;
child1->parent = item;
child2->parent = item;
/* EAX = item->byte_value */
if (item->byte_value >= max_byte) {
max_byte = item->byte_value;
} else {
/* EDI */
struct huffman_tree_item_s *p_item2 = child2->prev;
found = 0;
/* check if item is a valid pointer. */
if (PTR_INT(p_item2) > 0) {
/* 15006C2D */
do {
/* check if we found item. */
if (p_item2->byte_value >= item->byte_value) {
found = 1;
break;
}
/* switch to previous item. */
p_item2 = p_item2->prev;
} while (PTR_INT(p_item2) > 0);
}
/* check if item was not found. */
if (found == 0) {
p_item2 = NULL;
}
/* check if next item exist. */
if (item->next != 0) {
/* some common variables. */
struct huffman_tree_item_s *temp4 = libmpq__huffman_previous_item(item, -1);
/* zhe first item changed. */
temp4->next = item->next;
/* first->prev changed to negative value. */
item->next->prev = item->prev;
item->next = NULL;
item->prev = NULL;
}
/* 15006C62 */
if (p_item2 == NULL) {
p_item2 = PTR_PTR(&ht->first);
}
/* set item with 0x100 byte value. */
item->next = p_item2->next;
/* set item with 0x17 byte value. */
item->prev = p_item2->next->prev;
/* changed prev of item with. */
p_item2->next->prev = item;
p_item2->next = item;
}
/* 15006C7B */
if (PTR_INT((child1 = child2->prev)) <= 0) {
break;
}
}
}
/* 15006C88 */
ht->offs0004 = 1;
}
/* this function did the real decompression. */
int32_t libmpq__do_decompress_huffman(struct huffman_tree_s *ht, struct huffman_input_stream_s *is, uint8_t *out_buf, uint32_t out_length) {
/* some common variables. */
uint32_t dcmp_byte = 0;
uint8_t *out_pos = out_buf;
uint32_t bit_count;
struct huffman_decompress_s *qd;
struct huffman_tree_item_s *p_item1;
struct huffman_tree_item_s *p_item2;
/* 8 bits loaded from input stream. */
uint32_t n8bits;
/* 7 bits loaded from input stream. */
uint32_t n7bits;
/* thats needed to replace the goto stuff from original source. :) */
uint32_t found;
/* can we use quick decompression */
uint32_t has_qd;
/* test the output length, must not be non zero. */
if (out_length == 0) {
return 0;
}
/* get the compression type from the input stream. */
n8bits = libmpq__huffman_get_8bit(is);
/* build the Huffman tree. */
libmpq__huffman_tree_build(ht, n8bits);
/* compression 8 bit or not? */
ht->cmp0 = (n8bits == 0) ? TRUE : FALSE;
/* loop until break. */
for(;;) {
/* get 7 bits from input stream. */
n7bits = libmpq__huffman_get_7bit(is);
/* try to use quick decompression, check huffman decompress struct for corresponding item. */
qd = &ht->qd3474[n7bits];
/* if there is a quick-pass possible (ebx). */
has_qd = (qd->offs00 >= ht->offs0004) ? TRUE : FALSE;
/* if we can use quick decompress, use it. */
if (has_qd) {
found = 0;
if (qd->bits > 7) {
is->bit_buf >>= 7;
is->bits -= 7;
p_item1 = qd->p_item;
found = 1;
}
if (found == 0) {
is->bit_buf >>= qd->bits;
is->bits -= qd->bits;
dcmp_byte = qd->dcmp_byte;
}
} else {
found = 1;
p_item1 = ht->first->next->prev;
if (PTR_INT(p_item1) <= 0) {
p_item1 = NULL;
}
}
/* check if item was found. */
if (found == 1) {
bit_count = 0;
p_item2 = NULL;
/* loop until tree has no deeper level. */
do {
/* move down by one level. */
p_item1 = p_item1->child;
/* check if current bit is set, move to previous. */
if (libmpq__huffman_get_1bit(is)) {
p_item1 = p_item1->prev;
}
/* check if we are at 7th bit, save current huffman tree item. */
if (++bit_count == 7) {
p_item2 = p_item1;
}
} while (p_item1->child != NULL);
/* no quick decompression. :( */
if (has_qd == FALSE) {
/* check bit counter. */
if (bit_count > 7) {
qd->offs00 = ht->offs0004;
qd->bits = bit_count;
qd->p_item = p_item2;
} else {
uint32_t index = n7bits & (0xFFFFFFFF >> (32 - bit_count));
uint32_t add = (1 << bit_count);
/* loop through compression. */
for (qd = &ht->qd3474[index]; index <= 0x7F; index += add, qd += add) {
qd->offs00 = ht->offs0004;
qd->bits = bit_count;
qd->dcmp_byte = p_item1->dcmp_byte;
}
}
}
/* set compression byte. */
dcmp_byte = p_item1->dcmp_byte;
}
/* check if huffman tree needs to be modified. */
if (dcmp_byte == 0x101) {
/* fill values. */
n8bits = libmpq__huffman_get_8bit(is);
p_item1 = (ht->last <= 0) ? NULL : ht->last;
p_item2 = libmpq__huffman_call_1500E740(ht);
p_item2->parent = p_item1;
p_item2->dcmp_byte = p_item1->dcmp_byte;
p_item2->byte_value = p_item1->byte_value;
ht->items306C[p_item2->dcmp_byte] = p_item2;
p_item2 = libmpq__huffman_call_1500E740(ht);
p_item2->parent = p_item1;
p_item2->dcmp_byte = n8bits;
p_item2->byte_value = 0;
ht->items306C[p_item2->dcmp_byte] = p_item2;
p_item1->child = p_item2;
/* call 1500E820. */
libmpq__huffman_call_1500E820(ht, p_item2);
/* check if compression is not set. */
if (ht->cmp0 == 0) {
libmpq__huffman_call_1500E820(ht, ht->items306C[n8bits]);
}
/* set compression byte. */
dcmp_byte = n8bits;
}
/* check for compression. */
if (dcmp_byte == 0x100) {
break;
}
/* increase position by compression byte. */
*out_pos++ = (uint8_t)dcmp_byte;
if (--out_length == 0) {
break;
}
/* check if compression is not set. */
if (ht->cmp0) {
libmpq__huffman_call_1500E820(ht, ht->items306C[dcmp_byte]);
}
}
/* return copied bytes. */
return (out_pos - out_buf);
}
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