1.请问有没有LZW压缩算法的源代码？
2.急求LZW算法源代码!!!
3.跪求C语言进行哈夫曼编码、算术编码和LZW编码，要求源程序要有注释。源码 mcbbs
请问有没有LZW压缩算法的源代码？
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define PATHSIZE
#define BITS
#define HashShift BITS-8
#define MAX_VALUE ((1<<BITS)-1)
#define MAX_CODE (MAX_VALUE-1)
#define HashTableLen
#define process
/*压缩结构*/
typedef struct
{
int *code;
unsigned int *prenum;
unsigned char *baknum;
}LZW_DATA;
unsigned char decode_stack[HashTableLen];
LZW_DATA lzwt,*lzw;
void dataout(FILE *output,unsigned int code);/*输出压缩后的流*/
unsigned int hashfind(unsigned int hash_prenum,unsigned int hash_character);/*压缩算法*/
char *decode(unsigned char *buffer,unsigned int code);
unsigned int incode(FILE *input);
void compress(FILE *input,FILE *output);
void decompress(FILE *input,FILE *output);
int main()
{
FILE *fp1,*fp2;
char path[PATHSIZE];
S1:puts("Input function.(h:hoop,u:uncompress)...");
fflush(stdin);
gets(path);
if(!strcmp(path,"h")||!strcmp(path,"hoop"))
{
printf("Input source file path:");
fflush(stdin);
gets(path);
if((fp1=fopen(path,"rb"))==NULL)
{
puts("Can not open source file!");
return 1;
}
printf("Input objective file path:");
fflush(stdin);
gets(path);
if((fp2=fopen(path,"wb"))==NULL)
{
puts("Can not open objective file!");
return 1;
}
compress(fp1,fp2);
}
else if(!strcmp(path,"u")||!strcmp(path,"uncompress"))
{
printf("Input source file path:");
fflush(stdin);
gets(path);
if((fp1=fopen(path,"rb"))==NULL)
{
puts("Can not open source file!");
return 1;
}
printf("Input objective file path:");
fflush(stdin);
gets(path);
if((fp2=fopen(path,"wb"))==NULL)
{
puts("Can not open objective file!");
return 1;
}
decompress(fp1,fp2);
}
else
{
puts("Input error,please input again!");
goto S1;
}
fclose(fp1);
fclose(fp2);
S2:puts("If continue or not(y:yes/n:no)?");
fflush(stdin);
gets(path);
if(!strcmp(path,"y")||!strcmp(path,"yes"))
{
goto S1;
}
else if(!strcmp(path,"n")||!strcmp(path,"no"))
{
goto S3;
}
else
{
puts("Input error,please input again!");
goto S2;
}
S3:return 0;
}
void compress(FILE *input,FILE *output)
{
int i,index,len1,len2;
int curr_code;
int baknum;
int prenum;
len1=HashTableLen*sizeof(unsigned int);
len2=HashTableLen*sizeof(unsigned char);
if(!(lzwt.code=(int*)malloc(len1)))
{
puts("Internal memory distribution error!");
exit(0);
}
if(!(lzwt.prenum=(unsigned int*)malloc(len1)))
{
puts("Internal memory distribution error!");
exit(0);
}
if(!(lzwt.baknum=(unsigned char*)malloc(len2)))
{
puts("Internal memory distribution error!");
exit(0);
}
lzw=&lzwt;
curr_code=;
for(i=0;i<HashTableLen;i++)
{
lzw->code[i]=-1;
}
i=0;
puts("Hoop begin.");
prenum=getc(input);
while((baknum=getc(input))!=EOF)
{
index=hashfind(prenum,baknum);
if(lzw->code[index]!=-1)
{
prenum=lzw->code[index];
}
else
{
if(curr_code<=(MAX_CODE))
{
lzw->code[index]=curr_code++;
lzw->prenum[index]=prenum;
lzw->baknum[index]=baknum;
}
dataout(output,prenum);
prenum=baknum;
}
if(i==prenum)
{
i=0;
putchar('.');
}
else
{
i++;
}
}
dataout(output,prenum);
dataout(output,MAX_VALUE);
dataout(output,0);
free(lzw->code);
free(lzw->prenum);
free(lzw->baknum);
}
unsigned int hashfind(unsigned int prenum,unsigned int baknum)
{
int index;
int offset;
index=(baknum<<HashShift)^prenum;
if(index==0)
{
offset=1;
}
else
{
offset=HashTableLen-index;
}
while(1)
{
if(lzw->code[index]==-1)
{
return index;
}
if(lzw->prenum[index]==prenum&&lzw->baknum[index]==baknum)
{
return index;
}
index-=offset;
if(index<0)
{
index+=HashTableLen;
}
}
}
void dataout(FILE *output,unsigned int code)
{
static int outbinary=0;
static unsigned long nob=0L;
nob|=(unsigned long)code<<(-BITS-outbinary);
outbinary+=BITS;
while(outbinary>=8)
{
putc(nob>>,output);
nob<<=8;
outbinary=outbinary-8;
}
}
void decompress(FILE *input,FILE *output)
{
unsigned int curr_code;
unsigned int baknum;
unsigned int prenum;
int i,ch,len1,len2;
char *ps;
len1=HashTableLen*sizeof(unsigned int);
len2=HashTableLen*sizeof(unsigned char);
if(!(lzwt.code=(int*)malloc(len1)))
{
puts("Internal memory distribution error!");
exit(0);
}
if(!(lzwt.prenum=(unsigned int*)malloc(len1)))
{
puts("Internal memory distribution error!");
exit(0);
}
if(!(lzwt.baknum=(unsigned char*)malloc(len2)))
{
puts("Internal memory distribution error!");
exit(0);
}
lzw=&lzwt;
curr_code=;
i=0;
puts("Uncompress begin.");
ch=prenum=incode(input);
putc(prenum,output);
while((baknum=incode(input))!=MAX_VALUE)
{
if(baknum>=curr_code)
{
*decode_stack=ch;
ps=decode(decode_stack+1,prenum);
}
else
{
ps=decode(decode_stack,prenum);
}
ch=*ps;
while(ps>=decode_stack)
{
putc(*(ps--),output);
}
if(curr_code<=MAX_CODE)
{
lzw->prenum[curr_code]=prenum;
lzw->baknum[curr_code]=ch;
curr_code++;
}
prenum=baknum;
if(i==process)
{
i=0;
putchar('.');
}
else
{
i++;
}
}
free(lzw->code);
free(lzw->prenum);
free(lzw->baknum);
}
char *decode(unsigned char *buffer,unsigned int code)
{
int len=0;
while(code>)
{
*buffer++=lzw->baknum[code];
code=lzw->prenum[code];
len++;
if(len>=HashTableLen)
{
puts("Internal memory run over!");
exit(1);
}
}
*buffer=code;
return buffer;
}
unsigned int incode(FILE *input)
{
unsigned int ret;
static int inputbinary=0;
static unsigned long nib=0L;
while(inputbinary<=)
{
nib|=(unsigned long)getc(input)<<(-inputbinary);
inputbinary=inputbinary+8;
}
ret=nib>>(-BITS);
nib<<=BITS;
inputbinary=inputbinary-BITS;
return ret;
}
这是我以前写的LZW算法，压缩和解压缩文本文件都没问题，股票趋势买卖源码就是绝地反击源码分享解压后可能字符的顺序有点问题，呵呵用作学习的
我在这个地址回答过了，这样的复杂算法一般不会有个人去写的，我写了就觉得晕，如果提问的是同一个人，加我QQ我抽空教你原理。
/question/.html?fr=im
急求LZW算法源代码!!!
#include<iostream>
#include<cstdio>
#include<cstring>
#include<ctime>//用来计算压缩的时间
using namespace std;
//定义常数
const int MAX = ;//最大code数，是智能狙击箱体源码一个素数，求模是速度比较快
const int ascii = ; //ascii代码的数量
const int ByteSize = 8; //8个字节
struct Element//hash表中的元素
{
int key;
int code;
Element *next;
}*table[MAX];//hash表
int hashfunction(int key)//hash函数
{
return key%MAX;
}
void hashinit(void)//hash表初始化
{
memset(table,0,sizeof(table));
}
void hashinsert(Element element)//hash表的插入
{
int k = hashfunction(element.key);
if(table[k]!=NULL)
{
Element *e=table[k];
while(e->next!=NULL)
{
e=e->next;
}
e->next=new Element;
e=e->next;
e->key = element.key;
e->code = element.code;
e->next = NULL;
}
else
{
table[k]=new Element;
table[k]->key = element.key;
table[k]->code = element.code;
table[k]->next = NULL;
}
}
bool hashfind(int key,Element &element)//hash表的查找
{
int k = hashfunction(key);
if(table[k]!=NULL)
{
Element *e=table[k];
while(e!=NULL)
{
if(e->key == key)
{
element.key = e->key;
element.code = e->code;
return true;
}
e=e->next;
}
return false;
}
else
{
return false;
}
}
void compress(void)//压缩程序
{
//打开一个流供写入
FILE *fp;
fp = fopen("result.dat", "wb");
Element element;
int used;
char c;
int pcode, k;
for(int i=0;i<ascii;i++)
{
element.key = i;
element.code = i;
hashinsert(element);
}
used = ascii;
c = getchar();
pcode = c;
while((c = getchar()) != EOF)
{
k = (pcode << ByteSize) + c;
if(hashfind(k, element))
pcode = element.code;
else
{
//cout<<pcode<<' ';
fwrite(&pcode, sizeof(pcode), 1, fp);
element.code = used++;
element.key = (pcode << ByteSize) | c;
hashinsert(element);
pcode = c;
}
}
//cout<<pcode<<endl;
fwrite(&pcode, sizeof(pcode), 1, fp);
}
int main(void)
{
int t1,t2;
//欲压缩的文本文件
//freopen("input.txt","r",stdin);
freopen("book5.txt","r",stdin);
t1=time(NULL);
hashinit();
compress();
t2=time(NULL);
cout<<"Compress complete! See result.dat."<<endl;
cout<<endl<<"Total use "<<t2-t1<<" seconds."<<endl;
}
跪求C语言进行哈夫曼编码、算术编码和LZW编码，live源码怎么用要求源程序要有注释。
以下是哈夫曼编码
#include<iostream>
#include<math.h>
#include<string>
#include<iomanip>
using namespace std;
int n;
int isin(string str,char a)
{
int temp=0;
for(int i=0;i<str.length();i++)
{
if(str[i]==a) temp=1;
}
return temp;
}
void bubble(double p[],string sign[])//排序
{
for(int i=0;i<n-1;i++)
{
for(int j=i+1;j<n;j++)
{
if(p[i]<p[j])
{
double temp=p[i];
p[i]=p[j];
p[j]=temp;
string m=sign[i];
sign[i]=sign[j];
sign[j]=m;
}
}
}
}
void huff(double tempp[],string tempstr[])
{
double p[][];
string sign[][];
sign[0][i]=tempstr[i]; //符号放在sign数组中
for(int i=0;i<n;i++)
{
p[0][i]=tempp[i]; //p数组放对应的概率(第1列中)
}
for(i=0;i<n-1;i++)
{
bubble(p[i],sign[i]); //第一次排序
for(int j=0;j<n-2-i;j++)
{
p[i+1][j]=p[i][j]; //前n-2-i个概率重新放在p数组中(是数组的第2列中)
sign[i+1][j]=sign[i][j];
}
p[i+1][j]=p[i][j]+p[i][j+1];//第一次两个最小概率求和
sign[i+1][j]=sign[i][j]+sign[i][j+1];//符号跟随
for(j=n-1-i;j<n;j++)
{
p[i+1][j]=0;
}
}
string final[];
for(i=n-2;i>=0;i--)
{
for(int k=0;k<n;k++)
{
if(isin(sign[i][n-2-i],sign[0][k][0])) final[k]+="0";
if(isin(sign[i][n-1-i],sign[0][k][0])) final[k]+="1";
}
}
cout<<setw(9)<<"哈弗曼编码如下:"<<endl;
for(i=0;i<n;i++)
{
cout<<setw(7)<<sign[0][i]<<setw(7)<<p[0][i]<<setw()<<final[i]<<
setw(7)<<final[i].length()<<endl;
}
}
void main()
{
char a[];
cout<<"该字符串符号为:";
cin>>a;
string s=a;
n=s.length();
char b[][2];
for(int i=0;i<n;i++)
{
b[i][0]=a[i];
b[i][1]='\0';
}
string str[];
for(i=0;i<n;i++)
{
str[i]=b[i];
}
double tempp[];
cout<<"字符概率依次为：";
for(i=0;i<n;i++)
{
cin>>tempp[i];
}
huff(tempp,str);
}
