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git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@204 fc73d0e0-1445-4013-8a0c-d673dee63da5
812 lines
15 KiB
C
812 lines
15 KiB
C
/*
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Q3Fusion - Quake III Clone Engine
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Copyright (C) 2003 Andrey Nazarov
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//
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// huff.c - Huffman compression routines for data bitstream
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//
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#include "bothdefs.h"
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#ifdef HUFFNETWORK
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#include "quakedef.h"
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#define ID_INLINE
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#define VALUE(a) ((int )(a))
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#define NODE(a) ((void *)(a))
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#define NODE_START NODE( 1)
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#define NODE_NONE NODE(256)
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#define NODE_NEXT NODE(257)
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#define NOT_REFERENCED 256
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#define HUFF_TREE_SIZE 7175
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typedef void *tree_t[HUFF_TREE_SIZE];
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//
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// pre-defined frequency counts for all bytes [0..255]
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//
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static int q3huffCounts[256] = {
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0x3D1CB, 0x0A0E9, 0x01894, 0x01BC2, 0x00E92, 0x00EA6, 0x017DE, 0x05AF3,
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0x08225, 0x01B26, 0x01E9E, 0x025F2, 0x02429, 0x0436B, 0x00F6D, 0x006F2,
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0x02060, 0x00644, 0x00636, 0x0067F, 0x0044C, 0x004BD, 0x004D6, 0x0046E,
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0x006D5, 0x00423, 0x004DE, 0x0047D, 0x004F9, 0x01186, 0x00AF5, 0x00D90,
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0x0553B, 0x00487, 0x00686, 0x0042A, 0x00413, 0x003F4, 0x0041D, 0x0042E,
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0x006BE, 0x00378, 0x0049C, 0x00352, 0x003C0, 0x0030C, 0x006D8, 0x00CE0,
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0x02986, 0x011A2, 0x016F9, 0x00A7D, 0x0122A, 0x00EFD, 0x0082D, 0x0074B,
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0x00A18, 0x0079D, 0x007B4, 0x003AC, 0x0046E, 0x006FC, 0x00686, 0x004B6,
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0x01657, 0x017F0, 0x01C36, 0x019FE, 0x00E7E, 0x00ED3, 0x005D4, 0x005F4,
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0x008A7, 0x00474, 0x0054B, 0x003CB, 0x00884, 0x004E0, 0x00530, 0x004AB,
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0x006EA, 0x00436, 0x004F0, 0x004F2, 0x00490, 0x003C5, 0x00483, 0x004A2,
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0x00543, 0x004CC, 0x005F9, 0x00640, 0x00A39, 0x00800, 0x009F2, 0x00CCB,
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0x0096A, 0x00E01, 0x009C8, 0x00AF0, 0x00A73, 0x01802, 0x00E4F, 0x00B18,
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0x037AD, 0x00C5C, 0x008AD, 0x00697, 0x00C88, 0x00AB3, 0x00DB8, 0x012BC,
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0x00FFB, 0x00DBB, 0x014A8, 0x00FB0, 0x01F01, 0x0178F, 0x014F0, 0x00F54,
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0x0131C, 0x00E9F, 0x011D6, 0x012C7, 0x016DC, 0x01900, 0x01851, 0x02063,
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0x05ACB, 0x01E9E, 0x01BA1, 0x022E7, 0x0153D, 0x01183, 0x00E39, 0x01488,
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0x014C0, 0x014D0, 0x014FA, 0x00DA4, 0x0099A, 0x0069E, 0x0071D, 0x00849,
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0x0077C, 0x0047D, 0x005EC, 0x00557, 0x004D4, 0x00405, 0x004EA, 0x00450,
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0x004DD, 0x003EE, 0x0047D, 0x00401, 0x004D9, 0x003B8, 0x00507, 0x003E5,
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0x006B1, 0x003F1, 0x004A3, 0x0036F, 0x0044B, 0x003A1, 0x00436, 0x003B7,
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0x00678, 0x003A2, 0x00481, 0x00406, 0x004EE, 0x00426, 0x004BE, 0x00424,
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0x00655, 0x003A2, 0x00452, 0x00390, 0x0040A, 0x0037C, 0x00486, 0x003DE,
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0x00497, 0x00352, 0x00461, 0x00387, 0x0043F, 0x00398, 0x00478, 0x00420,
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0x00D86, 0x008C0, 0x0112D, 0x02F68, 0x01E4E, 0x00541, 0x0051B, 0x00CCE,
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0x0079E, 0x00376, 0x003FF, 0x00458, 0x00435, 0x00412, 0x00425, 0x0042F,
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0x005CC, 0x003E9, 0x00448, 0x00393, 0x0041C, 0x003E3, 0x0042E, 0x0036C,
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0x00457, 0x00353, 0x00423, 0x00325, 0x00458, 0x0039B, 0x0044F, 0x00331,
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0x0076B, 0x00750, 0x003D0, 0x00349, 0x00467, 0x003BC, 0x00487, 0x003B6,
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0x01E6F, 0x003BA, 0x00509, 0x003A5, 0x00467, 0x00C87, 0x003FC, 0x0039F,
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0x0054B, 0x00300, 0x00410, 0x002E9, 0x003B8, 0x00325, 0x00431, 0x002E4,
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0x003F5, 0x00325, 0x003F0, 0x0031C, 0x003E4, 0x00421, 0x02CC1, 0x034C0
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};
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static int countinghuffCounts[256];
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//
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// static Huffman tree
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//
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static tree_t huffTree;
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//
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// received from MSG_* code
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//
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static int huffBitPos;
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/*
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=======================================================================================
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HUFFMAN TREE CONSTRUCTION
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=======================================================================================
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*/
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/*
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============
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Huff_PrepareTree
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============
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*/
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static ID_INLINE void Huff_PrepareTree( tree_t tree ) {
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void **node;
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memset( tree, 0, sizeof( tree_t ) );
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// create first node
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node = &tree[263];
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tree[0] = (void*)(VALUE( tree[0] )+1);
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node[7] = NODE_NONE;
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tree[2] = node;
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tree[3] = node;
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tree[4] = node;
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tree[261] = node;
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}
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/*
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============
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Huff_GetNode
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============
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*/
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static ID_INLINE void **Huff_GetNode( void **tree ) {
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void **node;
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int value;
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node = tree[262];
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if( !node ) {
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value = VALUE( tree[1] )++;
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node = &tree[value + 6407];
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return node;
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}
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tree[262] = node[0];
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return node;
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}
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/*
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============
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Huff_Swap
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============
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*/
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static ID_INLINE void Huff_Swap( void **tree1, void **tree2, void **tree3 ) {
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void **a, **b;
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a = tree2[2];
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if( a ) {
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if( a[0] == tree2 ) {
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a[0] = tree3;
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} else {
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a[1] = tree3;
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}
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} else {
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tree1[2] = tree3;
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}
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b = tree3[2];
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if( b ) {
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if( b[0] == tree3 ) {
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b[0] = tree2;
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tree2[2] = b;
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tree3[2] = a;
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return;
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}
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b[1] = tree2;
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tree2[2] = b;
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tree3[2] = a;
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return;
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}
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tree1[2] = tree2;
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tree2[2] = NULL;
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tree3[2] = a;
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}
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/*
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============
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Huff_SwapTrees
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============
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*/
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static ID_INLINE void Huff_SwapTrees( void **tree1, void **tree2 ) {
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void **temp;
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temp = tree1[3];
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tree1[3] = tree2[3];
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tree2[3] = temp;
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temp = tree1[4];
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tree1[4] = tree2[4];
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tree2[4] = temp;
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if( tree1[3] == tree1 ) {
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tree1[3] = tree2;
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}
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if( tree2[3] == tree2 ) {
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tree2[3] = tree1;
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}
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temp = tree1[3];
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if( temp ) {
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temp[4] = tree1;
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}
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temp = tree2[3];
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if( temp ) {
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temp[4] = tree2;
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}
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temp = tree1[4];
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if( temp ) {
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temp[3] = tree1;
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}
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temp = tree2[4];
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if( temp ) {
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temp[3] = tree2;
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}
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}
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/*
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============
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Huff_DeleteNode
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============
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*/
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static ID_INLINE void Huff_DeleteNode( void **tree1, void **tree2 ) {
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tree2[0] = tree1[262];
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tree1[262] = tree2;
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}
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/*
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============
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Huff_IncrementFreq_r
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============
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*/
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static void Huff_IncrementFreq_r( void **tree1, void **tree2 ) {
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void **a, **b;
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if( !tree2 ) {
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return;
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}
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a = tree2[3];
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if( a ) {
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a = a[6];
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if( a == tree2[6] ) {
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b = tree2[5];
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if( b[0] != tree2[2] ) {
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Huff_Swap( tree1, b[0], tree2 );
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}
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Huff_SwapTrees( b[0], tree2 );
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}
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}
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a = tree2[4];
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if( a && a[6] == tree2[6] ) {
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b = tree2[5];
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b[0] = a;
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} else {
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a = tree2[5];
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a[0] = 0;
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Huff_DeleteNode( tree1, tree2[5] );
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}
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VALUE( tree2[6] )++;
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a = tree2[3];
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if( a && a[6] == tree2[6] ) {
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tree2[5] = a[5];
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} else {
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a = Huff_GetNode( tree1 );
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tree2[5] = a;
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a[0] = tree2;
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}
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if( tree2[2] ) {
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Huff_IncrementFreq_r( tree1, tree2[2] );
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if( tree2[4] == tree2[2] ) {
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Huff_SwapTrees( tree2, tree2[2] );
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a = tree2[5];
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if( a[0] == tree2 ) {
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a[0] = tree2[2];
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}
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}
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}
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}
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/*
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============
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Huff_AddReference
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Insert 'ch' into the tree or increment it's frequency
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============
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*/
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static void Huff_AddReference( void **tree, int ch ) {
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void **a, **b, **c, **d;
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int value;
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ch &= 255;
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if( tree[ch + 5] ) {
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Huff_IncrementFreq_r( tree, tree[ch + 5] );
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return; // already added
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}
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value = VALUE( tree[0] )++;
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b = &tree[value * 8 + 263];
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value = VALUE( tree[0] )++;
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a = &tree[value * 8 + 263];
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a[7] = NODE_NEXT;
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a[6] = NODE_START;
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d = tree[3];
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a[3] = d[3];
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if( a[3] ) {
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d = a[3];
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d[4] = a;
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d = a[3];
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if( d[6] == NODE_START ) {
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a[5] = d[5];
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} else {
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d = Huff_GetNode( tree );
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a[5] = d;
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d[0] = a;
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}
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} else {
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d = Huff_GetNode( tree );
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a[5] = d;
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d[0] = a;
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}
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d = tree[3];
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d[3] = a;
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a[4] = tree[3];
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b[7] = NODE( ch );
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b[6] = NODE_START;
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d = tree[3];
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b[3] = d[3];
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if( b[3] ) {
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d = b[3];
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d[4] = b;
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if( d[6] == NODE_START ) {
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b[5] = d[5];
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} else {
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d = Huff_GetNode( tree );
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b[5] = d;
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d[0] = a;
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}
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} else {
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d = Huff_GetNode( tree );
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b[5] = d;
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d[0] = b;
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}
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d = tree[3];
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d[3] = b;
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b[4] = tree[3];
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b[1] = NULL;
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b[0] = NULL;
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d = tree[3];
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c = d[2];
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if( c ) {
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if( c[0] == tree[3] ) {
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c[0] = a;
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} else {
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c[1] = a;
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}
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} else {
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tree[2] = a;
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}
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a[1] = b;
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d = tree[3];
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a[0] = d;
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a[2] = d[2];
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b[2] = a;
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d = tree[3];
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d[2] = a;
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tree[ch + 5] = b;
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Huff_IncrementFreq_r( tree, a[2] );
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}
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/*
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=======================================================================================
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BITSTREAM I/O
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=======================================================================================
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*/
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/*
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============
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Huff_EmitBit
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Put one bit into buffer
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============
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*/
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static ID_INLINE void Huff_EmitBit( int bit, qbyte *buffer ) {
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if( !(huffBitPos & 7) ) {
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buffer[huffBitPos >> 3] = 0;
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}
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buffer[huffBitPos >> 3] |= bit << (huffBitPos & 7);
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huffBitPos++;
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}
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/*
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============
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Huff_GetBit
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Read one bit from buffer
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============
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*/
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static ID_INLINE int Huff_GetBit( qbyte *buffer ) {
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int bit;
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bit = buffer[huffBitPos >> 3] >> (huffBitPos & 7);
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huffBitPos++;
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return (bit & 1);
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}
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/*
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============
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Huff_EmitPathToByte
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============
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*/
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static ID_INLINE void Huff_EmitPathToByte( void **tree, void **subtree, qbyte *buffer ) {
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if( tree[2] ) {
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Huff_EmitPathToByte( tree[2], tree, buffer );
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}
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if( !subtree ) {
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return;
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}
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//
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// emit tree walking control bits
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//
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if( tree[1] == subtree ) {
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Huff_EmitBit( 1, buffer );
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} else {
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Huff_EmitBit( 0, buffer );
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}
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}
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/*
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============
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Huff_GetByteFromTree
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Get one qbyte using dynamic or static tree
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============
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*/
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static ID_INLINE int Huff_GetByteFromTree( void **tree, qbyte *buffer ) {
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if( !tree ) {
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return 0;
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}
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//
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// walk through the tree until we get a value
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//
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while( tree[7] == NODE_NEXT ) {
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if( !Huff_GetBit( buffer ) ) {
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tree = tree[0];
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} else {
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tree = tree[1];
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}
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if( !tree ) {
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return 0;
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}
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}
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return VALUE( tree[7] );
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}
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/*
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============
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Huff_EmitByteDynamic
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Emit one qbyte using dynamic tree
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============
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*/
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static void Huff_EmitByteDynamic( void **tree, int value, qbyte *buffer ) {
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void **subtree;
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int i;
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//
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// if qbyte was already referenced, emit path to it
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//
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subtree = tree[value + 5];
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if( subtree ) {
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if( subtree[2] ) {
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Huff_EmitPathToByte( subtree[2], subtree, buffer );
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}
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return;
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}
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//
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// qbyte was not referenced, just emit 8 bits
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//
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Huff_EmitByteDynamic( tree, NOT_REFERENCED, buffer );
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for( i=7 ; i>=0 ; i-- ) {
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Huff_EmitBit( (value >> i) & 1, buffer );
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}
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}
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/*
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=======================================================================================
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PUBLIC INTERFACE
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=======================================================================================
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*/
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/*
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============
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Huff_CompressPacket
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Compress message using dynamic Huffman tree,
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beginning from specified offset
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============
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*/
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void Huff_EncryptPacket( sizebuf_t *msg, int offset ) {
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tree_t tree;
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qbyte buffer[MAX_NQMSGLEN];
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qbyte *data;
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int outLen;
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int inLen;
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int i;
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data = msg->data + offset;
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inLen = msg->cursize - offset;
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if( inLen <= 0 || inLen >= MAX_NQMSGLEN ) {
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return;
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}
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Huff_PrepareTree( tree );
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buffer[0] = inLen >> 8;
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buffer[1] = inLen & 0xFF;
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huffBitPos = 16;
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for( i=0 ; i<inLen ; i++ ) {
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Huff_EmitByteDynamic( tree, data[i], buffer );
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Huff_AddReference( tree, data[i] );
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}
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outLen = (huffBitPos >> 3) + 1;
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msg->cursize = offset + outLen;
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memcpy( data, buffer, outLen );
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}
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/*
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============
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Huff_DecompressPacket
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Decompress message using dynamic Huffman tree,
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beginning from specified offset
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============
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*/
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void Huff_DecryptPacket( sizebuf_t *msg, int offset ) {
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tree_t tree;
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qbyte buffer[MAX_NQMSGLEN];
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qbyte *data;
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int outLen;
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int inLen;
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int i, j;
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int ch;
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data = msg->data + offset;
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inLen = msg->cursize - offset;
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if( inLen <= 0 ) {
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return;
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}
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Huff_PrepareTree( tree );
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outLen = (data[0] << 8) + data[1];
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huffBitPos = 16;
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if( outLen > msg->maxsize - offset ) {
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outLen = msg->maxsize - offset;
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}
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for( i=0 ; i<outLen ; i++ ) {
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if( (huffBitPos >> 3) > inLen ) {
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buffer[i] = 0;
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break;
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}
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ch = Huff_GetByteFromTree( tree[2], data );
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if( ch == NOT_REFERENCED ) {
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ch = 0; // just read 8 bits
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for( j=0 ; j<8 ; j++ ) {
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ch <<= 1;
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ch |= Huff_GetBit( data );
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}
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}
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buffer[i] = ch;
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Huff_AddReference( tree, ch );
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}
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msg->cursize = offset + outLen;
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memcpy( data, buffer, outLen );
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}
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/*
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============
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Huff_EmitByte
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============
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*/
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void Huff_EmitByte( int ch, qbyte *buffer, int *count ) {
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huffBitPos = *count;
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Huff_EmitPathToByte( huffTree[ch + 5], NULL, buffer );
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*count = huffBitPos;
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}
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/*
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============
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Huff_GetByte
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============
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*/
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int Huff_GetByte( qbyte *buffer, int *count ) {
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int ch;
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huffBitPos = *count;
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ch = Huff_GetByteFromTree( huffTree[2], buffer );
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*count = huffBitPos;
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return ch;
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}
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static int madetable;
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/*
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============
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Huff_Init
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============
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*/
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void Huff_Init( int *huffCounts ) {
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int i, j;
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if (!huffCounts)
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huffCounts = q3huffCounts;
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// build empty tree
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Huff_PrepareTree( huffTree );
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// add all pre-defined qbyte references
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for( i=0 ; i<256 ; i++ ) {
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for( j=0 ; j<huffCounts[i] ; j++ ) {
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Huff_AddReference( huffTree, i );
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}
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}
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madetable=Com_BlockChecksum(huffCounts, sizeof(huffCounts));
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}
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void Huff_LoadTable(char *filename)
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{
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}
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int Huff_PreferedCompressionCRC (void)
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{
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if (!madetable)
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Huff_Init(NULL);
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return madetable;
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}
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qboolean Huff_CompressionCRC(int crc)
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{
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if (!madetable)
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Huff_Init(NULL);
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if (crc != madetable)
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return false;
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return true;
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}
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/*
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============
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Huff_CompressPacket
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Compress message using loaded Huffman tree,
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beginning from specified offset
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============
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*/
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void Huff_CompressPacket( sizebuf_t *msg, int offset )
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{
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qbyte buffer[MAX_NQMSGLEN];
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qbyte *data;
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int outLen;
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int inLen;
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int i;
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if (!madetable)
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Huff_Init(NULL);
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data = msg->data + offset;
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inLen = msg->cursize - offset;
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if( inLen <= 0 || inLen >= MAX_NQMSGLEN ) {
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return;
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}
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outLen = 0;
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for( i=0 ; i<inLen ; i++ )
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{
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if (i == MAX_NQMSGLEN)
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Sys_Error("Compression became too large\n");
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Huff_EmitByte(data[i], buffer, &outLen);
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countinghuffCounts[data[i]]++;
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}
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outLen = (huffBitPos >> 3) + 1;
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if (outLen > inLen)
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{
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memmove( data+1, data, inLen );
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data[0] = 0x80; //this would have grown the packet.
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msg->cursize+=1;
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return; //cap it at only 1 qbyte growth.
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}
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msg->cursize = offset + outLen;
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{ //add the bitcount
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data[0] = (outLen<<3) - huffBitPos;
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data+=1;
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msg->cursize+=1;
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}
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if (msg->cursize > msg->maxsize)
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Sys_Error("Compression became too large\n");
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memcpy( data, buffer, outLen );
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}
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/*
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============
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Huff_DecompressPacket
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Decompress message using loaded Huffman tree,
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beginning from specified offset
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============
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*/
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void Huff_DecompressPacket( sizebuf_t *msg, int offset )
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{
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qbyte buffer[MAX_NQMSGLEN];
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qbyte *data;
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int outLen;
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int inLen;
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int i;
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if (!madetable)
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Huff_Init(NULL);
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data = msg->data + offset;
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inLen = msg->cursize - offset;
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if( inLen <= 0 || inLen >= MAX_NQMSGLEN ) {
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return;
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}
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inLen<<=3;
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{ //add the bitcount
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inLen = inLen-8-data[0];
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if (data[0]&0x80)
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{ //packet would have grown.
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msg->cursize -= 1;
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memmove(data, data+1, msg->cursize);
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return; //this never happened, okay?
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}
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data+=1;
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}
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outLen = 0;
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for( i=0 ; outLen<inLen ; i++ )
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{
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if (i == MAX_NQMSGLEN)
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Sys_Error("Decompression became too large\n");
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buffer[i] = Huff_GetByte(data, &outLen);
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}
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msg->cursize = offset + i;
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if (msg->cursize > msg->maxsize)
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Sys_Error("Decompression became too large\n");
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memcpy( msg->data + offset, buffer, i );
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}
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#endif
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