mirror of
https://github.com/nzp-team/fteqw.git
synced 2024-11-23 12:22:42 +00:00
a699f6f0ff
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@2499 fc73d0e0-1445-4013-8a0c-d673dee63da5
813 lines
15 KiB
C
813 lines
15 KiB
C
/*
|
|
Q3Fusion - Quake III Clone Engine
|
|
|
|
Copyright (C) 2003 Andrey Nazarov
|
|
|
|
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.
|
|
*/
|
|
|
|
//
|
|
// huff.c - Huffman compression routines for data bitstream
|
|
//
|
|
#include "quakedef.h"
|
|
#ifdef HUFFNETWORK
|
|
#define ID_INLINE
|
|
|
|
#define VALUE(a) (*(int *)&(a))
|
|
#define NODE(a) ((void*)(a))
|
|
|
|
#define NODE_START NODE( 1)
|
|
#define NODE_NONE NODE(256)
|
|
#define NODE_NEXT NODE(257)
|
|
|
|
#define NOT_REFERENCED 256
|
|
|
|
#define HUFF_TREE_SIZE 7175
|
|
typedef void *tree_t[HUFF_TREE_SIZE];
|
|
|
|
//
|
|
// pre-defined frequency counts for all bytes [0..255]
|
|
//
|
|
static int q3huffCounts[256] = {
|
|
0x3D1CB, 0x0A0E9, 0x01894, 0x01BC2, 0x00E92, 0x00EA6, 0x017DE, 0x05AF3,
|
|
0x08225, 0x01B26, 0x01E9E, 0x025F2, 0x02429, 0x0436B, 0x00F6D, 0x006F2,
|
|
0x02060, 0x00644, 0x00636, 0x0067F, 0x0044C, 0x004BD, 0x004D6, 0x0046E,
|
|
0x006D5, 0x00423, 0x004DE, 0x0047D, 0x004F9, 0x01186, 0x00AF5, 0x00D90,
|
|
0x0553B, 0x00487, 0x00686, 0x0042A, 0x00413, 0x003F4, 0x0041D, 0x0042E,
|
|
0x006BE, 0x00378, 0x0049C, 0x00352, 0x003C0, 0x0030C, 0x006D8, 0x00CE0,
|
|
0x02986, 0x011A2, 0x016F9, 0x00A7D, 0x0122A, 0x00EFD, 0x0082D, 0x0074B,
|
|
0x00A18, 0x0079D, 0x007B4, 0x003AC, 0x0046E, 0x006FC, 0x00686, 0x004B6,
|
|
0x01657, 0x017F0, 0x01C36, 0x019FE, 0x00E7E, 0x00ED3, 0x005D4, 0x005F4,
|
|
0x008A7, 0x00474, 0x0054B, 0x003CB, 0x00884, 0x004E0, 0x00530, 0x004AB,
|
|
0x006EA, 0x00436, 0x004F0, 0x004F2, 0x00490, 0x003C5, 0x00483, 0x004A2,
|
|
0x00543, 0x004CC, 0x005F9, 0x00640, 0x00A39, 0x00800, 0x009F2, 0x00CCB,
|
|
0x0096A, 0x00E01, 0x009C8, 0x00AF0, 0x00A73, 0x01802, 0x00E4F, 0x00B18,
|
|
0x037AD, 0x00C5C, 0x008AD, 0x00697, 0x00C88, 0x00AB3, 0x00DB8, 0x012BC,
|
|
0x00FFB, 0x00DBB, 0x014A8, 0x00FB0, 0x01F01, 0x0178F, 0x014F0, 0x00F54,
|
|
0x0131C, 0x00E9F, 0x011D6, 0x012C7, 0x016DC, 0x01900, 0x01851, 0x02063,
|
|
0x05ACB, 0x01E9E, 0x01BA1, 0x022E7, 0x0153D, 0x01183, 0x00E39, 0x01488,
|
|
0x014C0, 0x014D0, 0x014FA, 0x00DA4, 0x0099A, 0x0069E, 0x0071D, 0x00849,
|
|
0x0077C, 0x0047D, 0x005EC, 0x00557, 0x004D4, 0x00405, 0x004EA, 0x00450,
|
|
0x004DD, 0x003EE, 0x0047D, 0x00401, 0x004D9, 0x003B8, 0x00507, 0x003E5,
|
|
0x006B1, 0x003F1, 0x004A3, 0x0036F, 0x0044B, 0x003A1, 0x00436, 0x003B7,
|
|
0x00678, 0x003A2, 0x00481, 0x00406, 0x004EE, 0x00426, 0x004BE, 0x00424,
|
|
0x00655, 0x003A2, 0x00452, 0x00390, 0x0040A, 0x0037C, 0x00486, 0x003DE,
|
|
0x00497, 0x00352, 0x00461, 0x00387, 0x0043F, 0x00398, 0x00478, 0x00420,
|
|
0x00D86, 0x008C0, 0x0112D, 0x02F68, 0x01E4E, 0x00541, 0x0051B, 0x00CCE,
|
|
0x0079E, 0x00376, 0x003FF, 0x00458, 0x00435, 0x00412, 0x00425, 0x0042F,
|
|
0x005CC, 0x003E9, 0x00448, 0x00393, 0x0041C, 0x003E3, 0x0042E, 0x0036C,
|
|
0x00457, 0x00353, 0x00423, 0x00325, 0x00458, 0x0039B, 0x0044F, 0x00331,
|
|
0x0076B, 0x00750, 0x003D0, 0x00349, 0x00467, 0x003BC, 0x00487, 0x003B6,
|
|
0x01E6F, 0x003BA, 0x00509, 0x003A5, 0x00467, 0x00C87, 0x003FC, 0x0039F,
|
|
0x0054B, 0x00300, 0x00410, 0x002E9, 0x003B8, 0x00325, 0x00431, 0x002E4,
|
|
0x003F5, 0x00325, 0x003F0, 0x0031C, 0x003E4, 0x00421, 0x02CC1, 0x034C0
|
|
};
|
|
|
|
static int countinghuffCounts[256];
|
|
|
|
|
|
//
|
|
// static Huffman tree
|
|
//
|
|
static tree_t huffTree;
|
|
|
|
//
|
|
// received from MSG_* code
|
|
//
|
|
static int huffBitPos;
|
|
|
|
|
|
/*
|
|
=======================================================================================
|
|
|
|
HUFFMAN TREE CONSTRUCTION
|
|
|
|
=======================================================================================
|
|
*/
|
|
|
|
/*
|
|
============
|
|
Huff_PrepareTree
|
|
============
|
|
*/
|
|
static ID_INLINE void Huff_PrepareTree( tree_t tree ) {
|
|
void **node;
|
|
|
|
memset( tree, 0, sizeof( tree_t ) );
|
|
|
|
// create first node
|
|
node = &tree[263];
|
|
tree[0] = (void*)(VALUE( tree[0] )+1);
|
|
|
|
node[7] = NODE_NONE;
|
|
tree[2] = node;
|
|
tree[3] = node;
|
|
tree[4] = node;
|
|
tree[261] = node;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
============
|
|
Huff_GetNode
|
|
============
|
|
*/
|
|
static ID_INLINE void **Huff_GetNode( void **tree ) {
|
|
void **node;
|
|
int value;
|
|
|
|
node = (void**)tree[262];
|
|
if( !node ) {
|
|
value = VALUE( tree[1] )++;
|
|
node = &tree[value + 6407];
|
|
return node;
|
|
}
|
|
|
|
tree[262] = node[0];
|
|
return node;
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_Swap
|
|
============
|
|
*/
|
|
static ID_INLINE void Huff_Swap( void **tree1, void **tree2, void **tree3 ) {
|
|
void **a, **b;
|
|
|
|
a = (void**)tree2[2];
|
|
if( a ) {
|
|
if( a[0] == tree2 ) {
|
|
a[0] = tree3;
|
|
} else {
|
|
a[1] = tree3;
|
|
}
|
|
} else {
|
|
tree1[2] = tree3;
|
|
}
|
|
|
|
b = (void**)tree3[2];
|
|
|
|
if( b ) {
|
|
if( b[0] == tree3 ) {
|
|
b[0] = tree2;
|
|
tree2[2] = b;
|
|
tree3[2] = a;
|
|
return;
|
|
}
|
|
|
|
b[1] = tree2;
|
|
tree2[2] = b;
|
|
tree3[2] = a;
|
|
return;
|
|
}
|
|
|
|
tree1[2] = tree2;
|
|
tree2[2] = NULL;
|
|
tree3[2] = a;
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_SwapTrees
|
|
============
|
|
*/
|
|
static ID_INLINE void Huff_SwapTrees( void **tree1, void **tree2 ) {
|
|
void **temp;
|
|
|
|
temp = (void**)tree1[3];
|
|
tree1[3] = tree2[3];
|
|
tree2[3] = temp;
|
|
|
|
temp = (void**)tree1[4];
|
|
tree1[4] = tree2[4];
|
|
tree2[4] = temp;
|
|
|
|
if( tree1[3] == tree1 ) {
|
|
tree1[3] = tree2;
|
|
}
|
|
|
|
if( tree2[3] == tree2 ) {
|
|
tree2[3] = tree1;
|
|
}
|
|
|
|
temp = (void**)tree1[3];
|
|
if( temp ) {
|
|
temp[4] = tree1;
|
|
}
|
|
|
|
temp = (void**)tree2[3];
|
|
if( temp ) {
|
|
temp[4] = tree2;
|
|
}
|
|
|
|
temp = (void**)tree1[4];
|
|
if( temp ) {
|
|
temp[3] = tree1;
|
|
}
|
|
|
|
temp = (void**)tree2[4];
|
|
if( temp ) {
|
|
temp[3] = tree2;
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_DeleteNode
|
|
============
|
|
*/
|
|
static ID_INLINE void Huff_DeleteNode( void **tree1, void **tree2 ) {
|
|
tree2[0] = tree1[262];
|
|
tree1[262] = tree2;
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_IncrementFreq_r
|
|
============
|
|
*/
|
|
static void Huff_IncrementFreq_r( void **tree1, void **tree2 ) {
|
|
void **a, **b;
|
|
|
|
if( !tree2 ) {
|
|
return;
|
|
}
|
|
|
|
a = (void**)tree2[3];
|
|
if( a ) {
|
|
a = (void**)a[6];
|
|
if( a == tree2[6] ) {
|
|
b = (void**)tree2[5];
|
|
if( b[0] != tree2[2] ) {
|
|
Huff_Swap( tree1, (void**)b[0], tree2 );
|
|
}
|
|
Huff_SwapTrees( (void**)b[0], tree2 );
|
|
}
|
|
}
|
|
|
|
a = (void**)tree2[4];
|
|
if( a && a[6] == tree2[6] ) {
|
|
b = (void**)tree2[5];
|
|
b[0] = a;
|
|
} else {
|
|
a = (void**)tree2[5];
|
|
a[0] = 0;
|
|
Huff_DeleteNode( tree1, (void**)tree2[5] );
|
|
}
|
|
|
|
|
|
VALUE( tree2[6] )++;
|
|
a = (void**)tree2[3];
|
|
if( a && a[6] == tree2[6] ) {
|
|
tree2[5] = a[5];
|
|
} else {
|
|
a = Huff_GetNode( tree1 );
|
|
tree2[5] = a;
|
|
a[0] = tree2;
|
|
}
|
|
|
|
if( tree2[2] ) {
|
|
Huff_IncrementFreq_r( tree1, (void**)tree2[2] );
|
|
|
|
if( tree2[4] == tree2[2] ) {
|
|
Huff_SwapTrees( tree2, (void**)tree2[2] );
|
|
a = (void**)tree2[5];
|
|
|
|
if( a[0] == tree2 ) {
|
|
a[0] = (void**)tree2[2];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_AddReference
|
|
|
|
Insert 'ch' into the tree or increment it's frequency
|
|
============
|
|
*/
|
|
static void Huff_AddReference( void **tree, int ch ) {
|
|
void **a, **b, **c, **d;
|
|
int value;
|
|
|
|
ch &= 255;
|
|
if( tree[ch + 5] ) {
|
|
Huff_IncrementFreq_r( tree, (void**)tree[ch + 5] );
|
|
return; // already added
|
|
}
|
|
|
|
value = VALUE( tree[0] )++;
|
|
b = &tree[value * 8 + 263];
|
|
|
|
value = VALUE( tree[0] )++;
|
|
a = &tree[value * 8 + 263];
|
|
|
|
a[7] = NODE_NEXT;
|
|
a[6] = NODE_START;
|
|
d = (void**)tree[3];
|
|
a[3] = d[3];
|
|
if( a[3] ) {
|
|
d = (void**)a[3];
|
|
d[4] = a;
|
|
d = (void**)a[3];
|
|
if( d[6] == NODE_START ) {
|
|
a[5] = d[5];
|
|
} else {
|
|
d = Huff_GetNode( tree );
|
|
a[5] = d;
|
|
d[0] = a;
|
|
}
|
|
} else {
|
|
d = Huff_GetNode( tree );
|
|
a[5] = d;
|
|
d[0] = a;
|
|
|
|
}
|
|
|
|
d = (void**)tree[3];
|
|
d[3] = a;
|
|
a[4] = (void**)tree[3];
|
|
b[7] = NODE( ch );
|
|
b[6] = NODE_START;
|
|
d = (void**)tree[3];
|
|
b[3] = d[3];
|
|
if( b[3] ) {
|
|
d = (void**)b[3];
|
|
d[4] = b;
|
|
if( d[6] == NODE_START ) {
|
|
b[5] = d[5];
|
|
} else {
|
|
d = Huff_GetNode( tree );
|
|
b[5] = d;
|
|
d[0] = a;
|
|
}
|
|
} else {
|
|
d = Huff_GetNode( tree );
|
|
b[5] = d;
|
|
d[0] = b;
|
|
}
|
|
|
|
d = (void**)tree[3];
|
|
d[3] = b;
|
|
b[4] = (void**)tree[3];
|
|
b[1] = NULL;
|
|
b[0] = NULL;
|
|
d = (void**)tree[3];
|
|
c = (void**)d[2];
|
|
if( c ) {
|
|
if( c[0] == tree[3] ) {
|
|
c[0] = a;
|
|
} else {
|
|
c[1] = a;
|
|
}
|
|
} else {
|
|
tree[2] = a;
|
|
}
|
|
|
|
a[1] = b;
|
|
d = (void**)tree[3];
|
|
a[0] = d;
|
|
a[2] = d[2];
|
|
b[2] = a;
|
|
d = (void**)tree[3];
|
|
d[2] = a;
|
|
tree[ch + 5] = b;
|
|
|
|
Huff_IncrementFreq_r( tree, (void**)a[2] );
|
|
}
|
|
|
|
/*
|
|
=======================================================================================
|
|
|
|
BITSTREAM I/O
|
|
|
|
=======================================================================================
|
|
*/
|
|
|
|
/*
|
|
============
|
|
Huff_EmitBit
|
|
|
|
Put one bit into buffer
|
|
============
|
|
*/
|
|
static ID_INLINE void Huff_EmitBit( int bit, qbyte *buffer ) {
|
|
if( !(huffBitPos & 7) ) {
|
|
buffer[huffBitPos >> 3] = 0;
|
|
}
|
|
|
|
buffer[huffBitPos >> 3] |= bit << (huffBitPos & 7);
|
|
huffBitPos++;
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_GetBit
|
|
|
|
Read one bit from buffer
|
|
============
|
|
*/
|
|
static ID_INLINE int Huff_GetBit( qbyte *buffer ) {
|
|
int bit;
|
|
|
|
bit = buffer[huffBitPos >> 3] >> (huffBitPos & 7);
|
|
huffBitPos++;
|
|
|
|
return (bit & 1);
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_EmitPathToByte
|
|
============
|
|
*/
|
|
static ID_INLINE void Huff_EmitPathToByte( void **tree, void **subtree, qbyte *buffer ) {
|
|
if( tree[2] ) {
|
|
Huff_EmitPathToByte( (void**)tree[2], tree, buffer );
|
|
}
|
|
|
|
if( !subtree ) {
|
|
return;
|
|
}
|
|
|
|
//
|
|
// emit tree walking control bits
|
|
//
|
|
if( tree[1] == subtree ) {
|
|
Huff_EmitBit( 1, buffer );
|
|
} else {
|
|
Huff_EmitBit( 0, buffer );
|
|
}
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_GetByteFromTree
|
|
|
|
Get one qbyte using dynamic or static tree
|
|
============
|
|
*/
|
|
static ID_INLINE int Huff_GetByteFromTree( void **tree, qbyte *buffer ) {
|
|
if( !tree ) {
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// walk through the tree until we get a value
|
|
//
|
|
while( tree[7] == NODE_NEXT ) {
|
|
if( !Huff_GetBit( buffer ) ) {
|
|
tree = (void**)tree[0];
|
|
} else {
|
|
tree = (void**)tree[1];
|
|
}
|
|
|
|
if( !tree ) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return VALUE( tree[7] );
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_EmitByteDynamic
|
|
|
|
Emit one qbyte using dynamic tree
|
|
============
|
|
*/
|
|
static void Huff_EmitByteDynamic( void **tree, int value, qbyte *buffer ) {
|
|
void **subtree;
|
|
int i;
|
|
|
|
//
|
|
// if qbyte was already referenced, emit path to it
|
|
//
|
|
subtree = (void**)tree[value + 5];
|
|
if( subtree ) {
|
|
if( subtree[2] ) {
|
|
Huff_EmitPathToByte( (void**)subtree[2], subtree, buffer );
|
|
}
|
|
return;
|
|
}
|
|
|
|
//
|
|
// qbyte was not referenced, just emit 8 bits
|
|
//
|
|
Huff_EmitByteDynamic( tree, NOT_REFERENCED, buffer );
|
|
|
|
for( i=7 ; i>=0 ; i-- ) {
|
|
Huff_EmitBit( (value >> i) & 1, buffer );
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
=======================================================================================
|
|
|
|
PUBLIC INTERFACE
|
|
|
|
=======================================================================================
|
|
*/
|
|
|
|
/*
|
|
============
|
|
Huff_CompressPacket
|
|
|
|
Compress message using dynamic Huffman tree,
|
|
beginning from specified offset
|
|
============
|
|
*/
|
|
void Huff_EncryptPacket( sizebuf_t *msg, int offset ) {
|
|
tree_t tree;
|
|
qbyte buffer[MAX_NQMSGLEN];
|
|
qbyte *data;
|
|
int outLen;
|
|
int inLen;
|
|
int i;
|
|
|
|
data = msg->data + offset;
|
|
inLen = msg->cursize - offset;
|
|
if( inLen <= 0 || inLen >= MAX_NQMSGLEN ) {
|
|
return;
|
|
}
|
|
|
|
Huff_PrepareTree( tree );
|
|
|
|
buffer[0] = inLen >> 8;
|
|
buffer[1] = inLen & 0xFF;
|
|
huffBitPos = 16;
|
|
|
|
for( i=0 ; i<inLen ; i++ ) {
|
|
Huff_EmitByteDynamic( tree, data[i], buffer );
|
|
Huff_AddReference( tree, data[i] );
|
|
}
|
|
|
|
outLen = (huffBitPos >> 3) + 1;
|
|
|
|
msg->cursize = offset + outLen;
|
|
memcpy( data, buffer, outLen );
|
|
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_DecompressPacket
|
|
|
|
Decompress message using dynamic Huffman tree,
|
|
beginning from specified offset
|
|
============
|
|
*/
|
|
void Huff_DecryptPacket( sizebuf_t *msg, int offset ) {
|
|
tree_t tree;
|
|
qbyte buffer[MAX_NQMSGLEN];
|
|
qbyte *data;
|
|
int outLen;
|
|
int inLen;
|
|
int i, j;
|
|
int ch;
|
|
|
|
data = msg->data + offset;
|
|
inLen = msg->cursize - offset;
|
|
if( inLen <= 0 ) {
|
|
return;
|
|
}
|
|
|
|
Huff_PrepareTree( tree );
|
|
|
|
outLen = (data[0] << 8) + data[1];
|
|
huffBitPos = 16;
|
|
|
|
if( outLen > msg->maxsize - offset ) {
|
|
outLen = msg->maxsize - offset;
|
|
}
|
|
|
|
for( i=0 ; i<outLen ; i++ ) {
|
|
if( (huffBitPos >> 3) > inLen ) {
|
|
buffer[i] = 0;
|
|
break;
|
|
}
|
|
|
|
ch = Huff_GetByteFromTree( (void**)tree[2], data );
|
|
|
|
if( ch == NOT_REFERENCED ) {
|
|
ch = 0; // just read 8 bits
|
|
for( j=0 ; j<8 ; j++ ) {
|
|
ch <<= 1;
|
|
ch |= Huff_GetBit( data );
|
|
}
|
|
}
|
|
|
|
buffer[i] = ch;
|
|
Huff_AddReference( tree, ch );
|
|
}
|
|
|
|
|
|
msg->cursize = offset + outLen;
|
|
memcpy( data, buffer, outLen );
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_EmitByte
|
|
============
|
|
*/
|
|
void Huff_EmitByte( int ch, qbyte *buffer, int *count ) {
|
|
huffBitPos = *count;
|
|
Huff_EmitPathToByte( (void**)huffTree[ch + 5], NULL, buffer );
|
|
*count = huffBitPos;
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_GetByte
|
|
============
|
|
*/
|
|
int Huff_GetByte( qbyte *buffer, int *count ) {
|
|
int ch;
|
|
|
|
huffBitPos = *count;
|
|
ch = Huff_GetByteFromTree( (void**)huffTree[2], buffer );
|
|
*count = huffBitPos;
|
|
|
|
return ch;
|
|
}
|
|
|
|
static int madetable;
|
|
/*
|
|
============
|
|
Huff_Init
|
|
============
|
|
*/
|
|
void Huff_Init( int *huffCounts ) {
|
|
int i, j;
|
|
|
|
if (!huffCounts)
|
|
huffCounts = q3huffCounts;
|
|
|
|
// build empty tree
|
|
Huff_PrepareTree( huffTree );
|
|
|
|
// add all pre-defined qbyte references
|
|
for( i=0 ; i<256 ; i++ ) {
|
|
for( j=0 ; j<huffCounts[i] ; j++ ) {
|
|
Huff_AddReference( huffTree, i );
|
|
}
|
|
huffCounts[i] = LittleLong(huffCounts[i]);
|
|
}
|
|
madetable=Com_BlockChecksum(huffCounts, sizeof(*huffCounts)*256);
|
|
for(i=0;i<256;i++)
|
|
huffCounts[i] = LittleLong(huffCounts[i]);
|
|
}
|
|
|
|
void Huff_LoadTable(char *filename)
|
|
{
|
|
}
|
|
|
|
int Huff_PreferedCompressionCRC (void)
|
|
{
|
|
if (!madetable)
|
|
Huff_Init(NULL);
|
|
return madetable;
|
|
}
|
|
|
|
qboolean Huff_CompressionCRC(int crc)
|
|
{
|
|
if (!madetable)
|
|
Huff_Init(NULL);
|
|
if (crc != LittleLong(madetable))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
============
|
|
Huff_CompressPacket
|
|
|
|
Compress message using loaded Huffman tree,
|
|
beginning from specified offset
|
|
============
|
|
*/
|
|
void Huff_CompressPacket( sizebuf_t *msg, int offset )
|
|
{
|
|
qbyte buffer[MAX_NQMSGLEN];
|
|
qbyte *data;
|
|
int outLen;
|
|
int inLen;
|
|
int i;
|
|
|
|
if (!madetable)
|
|
Huff_Init(NULL);
|
|
|
|
data = msg->data + offset;
|
|
inLen = msg->cursize - offset;
|
|
if( inLen <= 0 || inLen >= MAX_NQMSGLEN ) {
|
|
return;
|
|
}
|
|
|
|
outLen = 0;
|
|
for( i=0 ; i<inLen ; i++ )
|
|
{
|
|
if (i == MAX_NQMSGLEN)
|
|
Sys_Error("Compression became too large\n");
|
|
Huff_EmitByte(data[i], buffer, &outLen);
|
|
|
|
countinghuffCounts[data[i]]++;
|
|
}
|
|
|
|
outLen = (huffBitPos >> 3) + 1;
|
|
|
|
if (outLen > inLen)
|
|
{
|
|
memmove( data+1, data, inLen );
|
|
data[0] = 0x80; //this would have grown the packet.
|
|
msg->cursize+=1;
|
|
return; //cap it at only 1 qbyte growth.
|
|
}
|
|
|
|
msg->cursize = offset + outLen;
|
|
{ //add the bitcount
|
|
data[0] = (outLen<<3) - huffBitPos;
|
|
data+=1;
|
|
msg->cursize+=1;
|
|
}
|
|
if (msg->cursize > msg->maxsize)
|
|
Sys_Error("Compression became too large\n");
|
|
memcpy( data, buffer, outLen );
|
|
}
|
|
|
|
/*
|
|
============
|
|
Huff_DecompressPacket
|
|
|
|
Decompress message using loaded Huffman tree,
|
|
beginning from specified offset
|
|
============
|
|
*/
|
|
void Huff_DecompressPacket( sizebuf_t *msg, int offset )
|
|
{
|
|
qbyte buffer[MAX_NQMSGLEN];
|
|
qbyte *data;
|
|
int outLen;
|
|
int inLen;
|
|
int i;
|
|
|
|
if (!madetable)
|
|
Huff_Init(NULL);
|
|
|
|
data = msg->data + offset;
|
|
inLen = msg->cursize - offset;
|
|
if( inLen <= 0 || inLen >= MAX_NQMSGLEN ) {
|
|
return;
|
|
}
|
|
|
|
inLen<<=3;
|
|
{ //add the bitcount
|
|
inLen = inLen-8-data[0];
|
|
if (data[0]&0x80)
|
|
{ //packet would have grown.
|
|
msg->cursize -= 1;
|
|
memmove(data, data+1, msg->cursize);
|
|
return; //this never happened, okay?
|
|
}
|
|
data+=1;
|
|
}
|
|
|
|
outLen = 0;
|
|
for( i=0 ; outLen<inLen ; i++ )
|
|
{
|
|
if (i == MAX_NQMSGLEN)
|
|
Sys_Error("Decompression became too large\n");
|
|
buffer[i] = Huff_GetByte(data, &outLen);
|
|
}
|
|
|
|
msg->cursize = offset + i;
|
|
if (msg->cursize > msg->maxsize)
|
|
Sys_Error("Decompression became too large\n");
|
|
memcpy( msg->data + offset, buffer, i );
|
|
}
|
|
|
|
#endif
|