实现LZARI压缩算法的C++类

实现LZARI压缩算法的C++类
作者:阙荣文(querw) 这是一个基于LZARI算法的数据压缩的类.Haruhiko Okumura 于1989年7月4日用c语言写实现了这个算法.但是上面用到了一些全局或静态的变量,在MFC下用起来很不方便.我把它改写成了一个c++类,使它可以方便的压缩和解压缩,更重要的是,我新增加了两个接口,这个类可以压缩/解压缩一段内存缓冲区,而不仅仅是文件.
一共提供了5个对外接口:
1.压缩/解压缩文件

void Compress(const char *lpszInfile,const char *lpszOutfile);
void UnCompress(const char *lpszInfile,const char *lpszOutfile);

参数一目了然,可以像下面这样使用这两个接口:

LZARI Lzari;
Lzari.Compress("show.bmp","show.liz");	//压缩文件 show.bmp 到 show.liz
// Lzari.UnCompress("show.liz","show.bmp"); // 解压缩文件 show.liz 到 show.bmp

就这么简单.
2.压缩/解压缩一段内存缓冲区

void Compress(const BYTE *pInBuffer,int nInLength,const BYTE * &pOutBuffer ,int &nOutLength);
void UnCompress(const BYTE *pInBuffer,int nInLength,const BYTE * &pOutBuffer,int &nOutLength);

这两个接口的参数也不难理解,分别传入输入指针和长度,LZARI会返回一个只读的输出指针和长度.使用者不用担心内存分配的问题,当不需要使用输出结果时调用Release()就行了,以下是使用示例:

LZARI Lzari;
BYTE *pOutBuffer = NULL;
int nOutSize = 0;
char szInBuffer[] = "This is a class for compress and uncompress";
Lzari.Compress(szInBuffer,strlen(szInBuffer),pOutBuffer,nOutSize);//压缩pInBuffer
//
// 用pOutBuffer 做一些事情
//
Lzari.Release();
[code]3.释放内存,并清空标志.

void Release();

若想让一个LZARI类实例既进行压缩操作又进行解压缩操作,请在后一个操作调用之前调用一下Release();
如下所示:

LZARI Lzari;
Lzari.Compress(pInBuffer,nInsize,pOutBuffer,nOutSize);//压缩pInBuffer
//
// 用pOutBuffer 做一些事情
//
Lzari.Release();
Lzari.UnCompress(pInBuffer2,nInsize2,pOutBuffer2,nOutSize2); //解压缩pInBuffer2
//
// ...
//
Lzari.Release();
请注意千万不要这样调用:
Lzari.Compress(pInBuffer,nInsize,pOutBuffer,nOutSize);//压缩pInBuffer
//
// 用pOutBuffer 做一些事情
//
Lzari.Release();
Lzari.UnCompress(pOutBuffer,nOutSize,pOutBuffer2,nOutSize2); //解压缩第一次压缩的结果
因为Release()后pOutBuffer的指针就无效了.而如果不调用Release()又会导致pOutBuffer和pOutBuffer2指向同一段内存从而导致混乱.碰到这种情况最好使用两个类实例来完成.如下:

LZARI Lzari;
LZARI UnLzari;
Lzari.Compress(pInBuffer,nInsize,pOutBuffer,nOutSize);//压缩pInBuffer
//
// ...
//

UnLzari.UnCompress(pOutBuffer,nOutSize,pOutBuffer2,nOutSize2); //解压缩第一次压缩的结果
//
// ...
//
Lzari.Release();
UnLzari.Release();


由于程序中用到了STL的vector模板,请在stdafx.h中加入以下一行:

#include .当然,这个类并不依赖于MFC,可以使用在任何C++程序中.

另外,LZARI压缩的效果比zip差一些,差距大约是5%~10%,压缩速度则基本相当.

注:与算法有关的问题请不要问我,我也不知道 :) 其他问题欢迎指教 querw@sina.com

/**************************************************************
LZARI.C -- A Data Compression Program
(tab = 4 spaces)
***************************************************************
4/7/1989 Haruhiko Okumura
Use, distribute, and modify this program freely.
Please send me your improved versions.
PC-VAN  SCIENCE
NIFTY-Serve PAF01022
CompuServe 74050,1022
**************************************************************/
/********** Bit I/O **********/
#ifndef _FILE_H_COMPRESSION_LZARI_
#define  _FILE_H_COMPRESSION_LZARI_
//#pragma warning(disable:4786)
//#include <VECTOR>
#define _OUTPUT_STATUS
#define N   4096 /* size of ring buffer */
#define F     60 /* upper limit for match_length */
#define THRESHOLD 2   /* encode string into position and length
if match_length is greater than this */
#define NIL   N /* index for root of binary search trees */
/********** Arithmetic Compression **********/
/*  If you are not familiar with arithmetic compression, you should read
I. E. Witten, R. M. Neal, and J. G. Cleary,
Communications of the ACM, Vol. 30, pp. 520-540 (1987),
from which much have been borrowed.  */
#define M   15
/* Q1 (= 2 to the M) must be sufficiently large, but not so
large as the unsigned long 4 * Q1 * (Q1 - 1) overflows.  */
#define Q1  (1UL << M)
#define Q2  (2 * Q1)
#define Q3  (3 * Q1)
#define Q4  (4 * Q1)
#define MAX_CUM (Q1 - 1)
#define N_CHAR  (256 - THRESHOLD + F)
class LZARI
{
public:
LZARI();
virtual ~LZARI();
protected:
FILE  *infile, *outfile;
unsigned long textsize;
unsigned long codesize;
unsigned long printcount;
unsigned char  text_buf[N + F - 1]; /* ring buffer of size N,with extra F-1 bytes to facilitate string comparison */
int match_position;
int match_length;  /* of longest match.  These areset by the InsertNode() procedure. */
int lson[N + 1];
int rson[N + 257];
int dad[N + 1];  /* left & right children &parents -- These constitute binary search trees. */
/* character code = 0, 1, ..., N_CHAR - 1 */
unsigned long low;
unsigned long high;
unsigned long value;
int  shifts;  /* counts for magnifying low and high around Q2 */
int  char_to_sym[N_CHAR];
int sym_to_char[N_CHAR + 1];
unsigned int sym_freq[N_CHAR + 1];  /* frequency for symbols */
unsigned int sym_cum[N_CHAR + 1];   /* cumulative freq for symbols */
unsigned int position_cum[N + 1];   /* cumulative freq for positions */
// Compress in memory;
bool m_bMem;
std::vector<BYTE> m_OutBuffer;
//BYTE *m_pOutBuffer;
int m_nOutLength;
//int m_nOutCur;
const BYTE *m_pInBuffer;
int m_nInLength;
int m_nInCur;
unsigned int  buffer_putbit, mask_putbit;
unsigned int  buffer_getbit, mask_getbit;
private:
void Error(char *message);
void PutBit(int bit);  /* Output one bit (bit = 0,1) */
void FlushBitBuffer(void);  /* Send remaining bits */
int GetBit(void);  /* Get one bit (0 or 1) */
/********** LZSS with multiple binary trees **********/
void InitTree(void);  /* Initialize trees */
void InsertNode(int r);
void DeleteNode(int p);  /* Delete node p from tree */
void StartModel(void); /* Initialize model */
void UpdateModel(int sym);
void Output(int bit);  /* Output 1 bit, followed by its complements */
void EncodeChar(int ch);
void EncodePosition(int position);
void EncodeEnd(void);
int BinarySearchSym(unsigned int x);
int BinarySearchPos(unsigned int x);
void StartDecode(void);
int DecodeChar(void);
int DecodePosition(void);
void Encode(void);
void Decode(void);
public:
void Compress(const char *lpszInfile,const char *lpszOutfile);
void UnCompress(const char *lpszInfile,const char *lpszOutfile);void Compress(const BYTE *pInBuffer,int nInLength,const BYTE * &pOutBuffer ,int &nOutLength);
void UnCompress(const BYTE *pInBuffer,int nInLength,const BYTE * &pOutBuffer,int &nOutLength);
void Release();
};
#endif
//lzari.cpp
/**************************************************************
LZARI.C -- A Data Compression Program
(tab = 4 spaces)
***************************************************************
4/7/1989 Haruhiko Okumura
Use, distribute, and modify this program freely.
Please send me your improved versions.
PC-VAN  SCIENCE
NIFTY-Serve PAF01022
CompuServe 74050,1022
**************************************************************/
/********************************************************************
lzari.cpp -- A Data Compression Class
created: 2004/10/04
created: 4:10:2004   16:44
file base: lzari
file ext: cpp
author: 阙荣文 (querw@sina.com)

purpose: 如上所述,lzari.c提供了lzari压缩算法的实现,基于lzari.c我把它
做成了一个c++类方便使用
*********************************************************************/
#include "StdAfx.h"
//#include <stdio.h>
//#include <stdlib.h>
//#include <string.h>
//#include <ctype.h>
#include "Lzari.h"
LZARI::LZARI()
{
infile = NULL;
outfile = NULL;
textsize = 0;
codesize = 0;
printcount = 0;
low = 0;
high = Q4;
value = 0;
shifts = 0;/* counts for magnifying low and high around Q2 */

m_bMem = FALSE;
m_pInBuffer = NULL;
m_nInLength = 0;
m_nInCur = 0;
//m_pOutBuffer = NULL;
m_nOutLength = 0;
// m_nOutCur = 0;
buffer_putbit = 0;
mask_putbit = 128;
buffer_getbit = 0;
mask_getbit = 0;
}
LZARI::~LZARI()
{
Release();
}
void LZARI::Error(char *message)
{
#ifdef _OUTPUT_STATUS
printf("/n%s/n", message);
#endif
//exit(EXIT_FAILURE);
int e = 1;
throw e;
}
void LZARI::PutBit(int bit)  /* Output one bit (bit = 0,1) */
{
if (bit) buffer_putbit |= mask_putbit;
if ((mask_putbit >>= 1) == 0)
{
if (!m_bMem)
{
if (putc(buffer_putbit, outfile) == EOF) Error("Write Error");
}
else
{
//if (m_nOutCur == m_nOutLength) Error("Write Error");
//m_pOutBuffer[m_nOutCur++] = buffer;
m_OutBuffer.push_back(buffer_putbit);
//m_nOutCur++;
}
buffer_putbit = 0;
mask_putbit = 128;
codesize++;
}
}
void LZARI::FlushBitBuffer(void)  /* Send remaining bits */
{
int  i;

for (i = 0; i < 7; i++) PutBit(0);
}
int LZARI::GetBit(void)  /* Get one bit (0 or 1) */
{
if ((mask_getbit >>= 1) == 0)
{
if (!m_bMem)
buffer_getbit = getc(infile);
else
buffer_getbit = m_pInBuffer[m_nInCur++];
mask_getbit = 128;
}
return ((buffer_getbit & mask_getbit) != 0);
}
/********** LZSS with multiple binary trees **********/
void LZARI::InitTree(void)  /* Initialize trees */
{
int  i;
/* For i = 0 to N - 1, rson[i] and lson[i] will be the right and
left children of node i.  These nodes need not be initialized.
Also, dad[i] is the parent of node i.  These are initialized to
NIL (= N), which stands for 'not used.'
For i = 0 to 255, rson[N + i + 1] is the root of the tree
for strings that begin with character i.  These are initialized
to NIL.  Note there are 256 trees. */
for (i = N + 1; i <= N + 256; i++) rson[i] = NIL; /* root */
for (i = 0; i < N; i++) dad[i] = NIL; /* node */
}
void LZARI::InsertNode(int r)
/* Inserts string of length F, text_buf[r..r+F-1], into one of the
trees (text_buf[r]'th tree) and returns the longest-match position
and length via the global variables match_position and match_length.
If match_length = F, then removes the old node in favor of the new
one, because the old one will be deleted sooner.
Note r plays double role, as tree node and position in buffer. */
{
int  i, p, cmp, temp;
unsigned char  *key;
cmp = 1;  key = &text_buf[r];  p = N + 1 + key[0];
rson[r] = lson[r] = NIL;  match_length = 0;
for ( ; ; )
{
if (cmp >= 0)
{
if (rson[p] != NIL) p = rson[p];
else {  rson[p] = r;  dad[r] = p;  return;  }
} else
{
if (lson[p] != NIL) p = lson[p];
else {  lson[p] = r;  dad[r] = p;  return;  }
}
for (i = 1; i < F; i++)
if ((cmp = key[i] - text_buf[p + i]) != 0)  break;
if (i > THRESHOLD)
{
if (i > match_length)
{
match_position = (r - p) & (N - 1);
if ((match_length = i) >= F) break;
} else if (i == match_length)
{
if ((temp = (r - p) & (N - 1)) < match_position)
match_position = temp;
}
}
}
dad[r] = dad[p];  lson[r] = lson[p];  rson[r] = rson[p];
dad[lson[p]] = r;  dad[rson[p]] = r;
if (rson[dad[p]] == p) rson[dad[p]] = r;
else                   lson[dad[p]] = r;
dad[p] = NIL;  /* remove p */
}
void LZARI::DeleteNode(int p)  /* Delete node p from tree */
{
int  q;

if (dad[p] == NIL) return;  /* not in tree */
if (rson[p] == NIL) q = lson[p];
else if (lson[p] == NIL) q = rson[p];
else
{
q = lson[p];
if (rson[q] != NIL)
{
do {  q = rson[q];  } while (rson[q] != NIL);
rson[dad[q]] = lson[q];  dad[lson[q]] = dad[q];
lson[q] = lson[p];  dad[lson[p]] = q;
}
rson[q] = rson[p];  dad[rson[p]] = q;
}
dad[q] = dad[p];
if (rson[dad[p]] == p) rson[dad[p]] = q;
else                   lson[dad[p]] = q;
dad[p] = NIL;
}
/********** Arithmetic Compression **********/
/*  If you are not familiar with arithmetic compression, you should read
I. E. Witten, R. M. Neal, and J. G. Cleary,
Communications of the ACM, Vol. 30, pp. 520-540 (1987),
from which much have been borrowed.  */
/* character code = 0, 1, ..., N_CHAR - 1 */

void LZARI::StartModel(void)  /* Initialize model */
{
int ch, sym, i;

sym_cum[N_CHAR] = 0;
for (sym = N_CHAR; sym >= 1; sym--)
{
ch = sym - 1;
char_to_sym[ch] = sym;  sym_to_char[sym] = ch;
sym_freq[sym] = 1;
sym_cum[sym - 1] = sym_cum[sym] + sym_freq[sym];
}
sym_freq[0] = 0;  /* sentinel (!= sym_freq[1]) */
position_cum
= 0;
for (i = N; i >= 1; i--)
position_cum[i - 1] = position_cum[i] + 10000 / (i + 200);
/* empirical distribution function (quite tentative) */
/* Please devise a better mechanism! */
}
void LZARI::UpdateModel(int sym)
{
int i, c, ch_i, ch_sym;

if (sym_cum[0] >= MAX_CUM)
{
c = 0;
for (i = N_CHAR; i > 0; i--)
{
sym_cum[i] = c;
c += (sym_freq[i] = (sym_freq[i] + 1) >> 1);
}
sym_cum[0] = c;
}
for (i = sym; sym_freq[i] == sym_freq[i - 1]; i--) ;
if (i < sym)
{
ch_i = sym_to_char[i];    ch_sym = sym_to_char[sym];
sym_to_char[i] = ch_sym;  sym_to_char[sym] = ch_i;
char_to_sym[ch_i] = sym;  char_to_sym[ch_sym] = i;
}
sym_freq[i]++;
while (--i >= 0) sym_cum[i]++;
}
void LZARI::Output(int bit)  /* Output 1 bit, followed by its complements */
{
PutBit(bit);
for ( ; shifts > 0; shifts--) PutBit(! bit);
}
void LZARI::EncodeChar(int ch)
{
int  sym;
unsigned long int  range;
sym = char_to_sym[ch];
range = high - low;
high = low + (range * sym_cum[sym - 1]) / sym_cum[0];
low +=       (range * sym_cum[sym    ]) / sym_cum[0];
for ( ; ; )
{
if (high <= Q2) Output(0);
else if (low >= Q2)
{
Output(1);  low -= Q2;  high -= Q2;
}
else if (low >= Q1 && high <= Q3)
{
shifts++;  low -= Q1;  high -= Q1;
}
else break;
low += low;
high += high;
}
UpdateModel(sym);
}
void LZARI::EncodePosition(int position)
{
unsigned long int  range;
range = high - low;
high = low + (range * position_cum[position    ]) / position_cum[0];
low +=       (range * position_cum[position + 1]) / position_cum[0];
for ( ; ; )
{
if (high <= Q2) Output(0);
else if (low >= Q2)
{
Output(1);  low -= Q2;  high -= Q2;
}
else if (low >= Q1 && high <= Q3)
{
shifts++;  low -= Q1;  high -= Q1;
}
else break;
low += low;
high += high;
}
}
void LZARI::EncodeEnd(void)
{
shifts++;
if (low < Q1) Output(0);  else Output(1);
FlushBitBuffer();  /* flush bits remaining in buffer */
}
int LZARI::BinarySearchSym(unsigned int x)
/* 1      if x >= sym_cum[1],
N_CHAR if sym_cum[N_CHAR] > x,
i such that sym_cum[i - 1] > x >= sym_cum[i] otherwise */
{
int i, j, k;

i = 1;  j = N_CHAR;
while (i < j)
{
k = (i + j) / 2;
if (sym_cum[k] > x) i = k + 1;  else j = k;
}
return i;
}
int LZARI::BinarySearchPos(unsigned int x)
/* 0 if x >= position_cum[1],
N - 1 if position_cum
> x,
i such that position_cum[i] > x >= position_cum[i + 1] otherwise */
{
int i, j, k;

i = 1;  j = N;
while (i < j)
{
k = (i + j) / 2;
if (position_cum[k] > x) i = k + 1;  else j = k;
}
return i - 1;
}
void LZARI::StartDecode(void)
{
int i;
for (i = 0; i < M + 2; i++)
value = 2 * value + GetBit();
}
int LZARI::DecodeChar(void)
{
int  sym, ch;
unsigned long int  range;

range = high - low;
sym = BinarySearchSym((unsigned int)
(((value - low + 1) * sym_cum[0] - 1) / range));
high = low + (range * sym_cum[sym - 1]) / sym_cum[0];
low +=       (range * sym_cum[sym    ]) / sym_cum[0];
for ( ; ; ) {
if (low >= Q2) {
value -= Q2;  low -= Q2;  high -= Q2;
} else if (low >= Q1 && high <= Q3) {
value -= Q1;  low -= Q1;  high -= Q1;
} else if (high > Q2) break;
low += low;  high += high;
value = 2 * value + GetBit();
}
ch = sym_to_char[sym];
UpdateModel(sym);
return ch;
}
int LZARI::DecodePosition(void)
{
int position;
unsigned long int  range;

range = high - low;
position = BinarySearchPos((unsigned int)
(((value - low + 1) * position_cum[0] - 1) / range));
high = low + (range * position_cum[position    ]) / position_cum[0];
low +=       (range * position_cum[position + 1]) / position_cum[0];
for ( ; ; ) {
if (low >= Q2) {
value -= Q2;  low -= Q2;  high -= Q2;
} else if (low >= Q1 && high <= Q3) {
value -= Q1;  low -= Q1;  high -= Q1;
} else if (high > Q2) break;
low += low;  high += high;
value = 2 * value + GetBit();
}
return position;
}
/********** Encode and Decode **********/
void LZARI::Encode(void)
{
int  i, c, len, r, s, last_match_length;

if(!m_bMem)
{
fseek(infile, 0L, SEEK_END);
textsize = ftell(infile);
if (fwrite(&textsize, sizeof textsize, 1, outfile) < 1)
Error("Write Error");  /* output size of text */
codesize += sizeof textsize;
if (textsize == 0) return;
rewind(infile);
textsize = 0;
}
else
{
textsize = m_nInLength;
m_OutBuffer.resize(sizeof textsize);
memcpy(&m_OutBuffer[0],&textsize,sizeof textsize);
//m_nOutCur += sizeof textsize;
codesize += sizeof textsize;
if(textsize == 0) return;
m_nInCur = 0;
textsize = 0;
}

StartModel();
InitTree();
s = 0;  r = N - F;
for (i = s; i < r; i++) text_buf[i] = ' ';
if(!m_bMem)
for (len = 0; len < F && (c = getc(infile)) != EOF; len++) text_buf[r + len] = c;
else
for (len = 0; len < F && m_nInCur < m_nInLength ; len++)
{
c = m_pInBuffer[m_nInCur++];
text_buf[r + len] = c;
}

textsize = len;
for (i = 1; i <= F; i++) InsertNode(r - i);

InsertNode(r);

do {
if (match_length > len) match_length = len;
if (match_length <= THRESHOLD)
{
match_length = 1;  EncodeChar(text_buf[r]);
}
else
{
EncodeChar(255 - THRESHOLD + match_length);
EncodePosition(match_position - 1);
}
last_match_length = match_length;
if(!m_bMem)
{
for (i = 0; i < last_match_length && (c = getc(infile)) != EOF; i++)
{
DeleteNode(s);  text_buf[s] = c;
if (s < F - 1) text_buf[s + N] = c;
s = (s + 1) & (N - 1);
r = (r + 1) & (N - 1);
InsertNode(r);
}
}
else
{
for (i = 0; i < last_match_length && m_nInCur < m_nInLength ; i++)
{
c = m_pInBuffer[m_nInCur++];
DeleteNode(s);
text_buf[s] = c;
if (s < F - 1) text_buf[s + N] = c;
s = (s + 1) & (N - 1);
r = (r + 1) & (N - 1);
InsertNode(r);
}
}
if ((textsize += i) > printcount)
{
#ifdef _OUTPUT_STATUS
printf("%12ld/r", textsize);
#endif
printcount += 1024;
}
while (i++ < last_match_length)
{
DeleteNode(s);
s = (s + 1) & (N - 1);
r = (r + 1) & (N - 1);
if (--len) InsertNode(r);
}
} while (len > 0);

EncodeEnd();
#ifdef _OUTPUT_STATUS
printf("In : %lu bytes/n", textsize);
printf("Out: %lu bytes/n", codesize);
printf("Out/In: %.3f/n", (double)codesize / textsize);
#endif
}
void LZARI::Decode(void)
{
int  i, j, k, r, c;
unsigned long int  count;
if (!m_bMem)
{
if (fread(&textsize, sizeof textsize, 1, infile) < 1)
Error("Read Error");  /* read size of text */
}
else
{
if(m_nInLength < sizeof textsize)
Error("Read Error");
memcpy(&textsize,m_pInBuffer + m_nInCur,sizeof textsize);

//m_OutBuffer.reserve(textsize);
m_nOutLength = textsize;
//m_nOutCur = 0;

m_nInCur += sizeof textsize;
}

if (textsize == 0) return;

StartDecode();
StartModel();

for (i = 0; i < N - F; i++) text_buf[i] = ' ';
r = N - F;
for (count = 0; count < textsize; )
{
c = DecodeChar();
if (c < 256)
{
if(!m_bMem)
putc(c, outfile);
else
{
//m_OutBuffer[m_nOutCur++] = c;
m_OutBuffer.push_back(c);
//m_nOutCur++;
}
text_buf[r++] = c;
r &= (N - 1);
count++;
}
else
{
i = (r - DecodePosition() - 1) & (N - 1);
j = c - 255 + THRESHOLD;
for (k = 0; k < j; k++)
{
c = text_buf[(i + k) & (N - 1)];
if(!m_bMem)
putc(c, outfile);
else
{
// m_pOutBuffer[m_nOutCur++] = c;
m_OutBuffer.push_back(c);
//m_nOutCur ++;
}
text_buf[r++] = c;
r &= (N - 1);
count++;
}
}
if (count > printcount)
{
#ifdef _OUTPUT_STATUS
printf("%12lu/r", count);
#endif
printcount += 1024;
}
}
#ifdef _OUTPUT_STATUS
printf("%12lu/n", count);
#endif
}
void LZARI::Compress(const char *lpszInfile,const char *lpszOutfile)
{
m_bMem = FALSE;

infile = fopen(lpszInfile,"rb");
outfile = fopen(lpszOutfile,"wb");
if(infile && outfile)
{
Encode();
fclose(infile);
fclose(outfile);
infile = NULL;
outfile = NULL;
}
}
void LZARI::UnCompress(const char *lpszInfile,const char *lpszOutfile)
{
m_bMem = FALSE;
infile = fopen(lpszInfile,"rb");
outfile = fopen(lpszOutfile,"wb");
if(infile && outfile)
{
Decode();
fclose(infile);
fclose(outfile);
infile = NULL;
outfile = NULL;
}
}
void LZARI::Compress(const BYTE *pInBuffer,int nInLength,const BYTE *&pOutBuffer ,int &nOutLength)
{
m_pInBuffer = pInBuffer;
m_nInLength = nInLength;
m_nInCur = 0;
// m_nOutCur = 0;
m_bMem = TRUE;
Encode();
pOutBuffer = &m_OutBuffer[0];
nOutLength = m_OutBuffer.size();
}
void LZARI::UnCompress(const BYTE *pInBuffer,int nInLength,const BYTE *&pOutBuffer ,int &nOutLength)
{
m_pInBuffer = pInBuffer;
m_nInLength = nInLength;
m_nInCur = 0;
m_bMem = TRUE;
Decode();
pOutBuffer = &m_OutBuffer[0];
nOutLength = m_OutBuffer.size();
m_OutBuffer.push_back(0);
}
void LZARI::Release()
{
if(!m_OutBuffer.empty())
{
infile = NULL;
outfile = NULL;

textsize = 0;
codesize = 0;
printcount = 0;

low = 0;
high = Q4;
value = 0;
shifts = 0;

m_bMem = FALSE;

m_pInBuffer = NULL;
m_nInLength = 0;
m_nInCur = 0;

m_OutBuffer.clear();
m_nOutLength = 0;
buffer_putbit = 0;
mask_putbit = 128;

buffer_getbit = 0;
mask_getbit = 0;
}
}