c语言压缩算法

‘壹’ 如何用c语言实现数据压缩

首先选择一个压缩算法

然后按照算法实现压缩代码，调用接口就可以
常见的 可以使用哈夫曼编码压缩，或者使用开源的压缩代码，比如lzo, gzip, lzma等等。

‘贰’ 用C语言如何对文件进行压缩

winrar软件安装后，所在的安装目录下有个rar.exe，开一个命令窗口到该目录下运行rar
/?就能看到用法了，在你的程序里面调用它的相应命令行是最简单的方法，自己编写压缩算法的话，先不谈效率，起码算法就是相当复杂的了

‘叁’ C语言编程对IPV6地址进行压缩算法用函数实现

#include<stdio.h>

intmain(void)
{
chars1[50],s2[50]={0};
intn;
scanf("%d",&n);
while(n--)
{
intf;
char*p=s1,*q=s2;
intt;
scanf("%s",s1);
while(p<s1+40)
{
sscanf(p,"%x",&t);
if(t==0&&f==0)
{
f=1;
}
else
{
sprintf(q,"%X",t);
while(*q)q++;
}

*q++=':';
p+=5;
}
*(q-1)=0;
puts(s2);
}
return0;
}

‘肆’ 请问用C语言怎么编写压缩软件啊

二大要点：
一、文件操作：
打开需要压缩的原文件并读取之；
新建写入的压缩文件写入之；

二、压缩算法

‘伍’ 谁能提供个lzw压缩算法的c语言完整实现

程序由五个模块组成。(1) lzw.h 定义了一些基本的数据结构，常量，还有变量的初始化等。#ifndef __LZW_H__
#define __LZW_H__
//------------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <memory.h>
//------------------------------------------------------------------------------
#define LZW_BASE 0x102// The code base
#define CODE_LEN 12 // Max code length
#define TABLE_LEN 4099 // It must be prime number and bigger than 2^CODE_LEN=4096.
// Such as 5051 is also ok.
#define BUFFERSIZE 1024
//------------------------------------------------------------------------------
typedef struct
{
HANDLE h_sour; // Source file handle.
HANDLE h_dest; // Destination file handle.

HANDLE h_suffix; // Suffix table handle.
HANDLE h_prefix; // Prefix table handle.
HANDLE h_code; // Code table handle.

LPWORD lp_prefix; // Prefix table head pointer.
LPBYTE lp_suffix; // Suffix table head pointer.
LPWORD lp_code; // Code table head pointer. WORD code;
WORD prefix;
BYTE suffix; BYTE cur_code_len; // Current code length.[ used in Dynamic-Code-Length mode ]}LZW_DATA,*PLZW_DATA;
typedef struct
{
WORD top;
WORD index; LPBYTE lp_buffer;
HANDLE h_buffer;

BYTE by_left;
DWORD dw_buffer; BOOL end_flag;}BUFFER_DATA,*PBUFFER_DATA;
typedef struct //Stack used in decode
{
WORD index;
HANDLE h_stack;
LPBYTE lp_stack;}STACK_DATA,*PSTACK_DATA;
//------------------------------------------------------------------------------
VOID stack_create( PSTACK_DATA stack )
{
stack->h_stack = GlobalAlloc( GHND , TABLE_LEN*sizeof(BYTE) );
stack->lp_stack = GlobalLock( stack->h_stack );
stack->index = 0;
}
//------------------------------------------------------------------------------
VOID stack_destory( PSTACK_DATA stack )
{
GlobalUnlock( stack->h_stack );
GlobalFree ( stack->h_stack );
}
//------------------------------------------------------------------------------
VOID buffer_create( PBUFFER_DATA buffer )
{
buffer->h_buffer = GlobalAlloc( GHND, BUFFERSIZE*sizeof(BYTE) );
buffer->lp_buffer = GlobalLock( buffer->h_buffer );
buffer->top = 0;
buffer->index = 0;
buffer->by_left = 0;
buffer->dw_buffer = 0;
buffer->end_flag = FALSE;
}
//------------------------------------------------------------------------------
VOID buffer_destory( PBUFFER_DATA buffer )
{
GlobalUnlock( buffer->h_buffer );
GlobalFree ( buffer->h_buffer );
}
//------------------------------------------------------------------------------
VOID re_init_lzw( PLZW_DATA lzw ) //When code table reached its top it should
{ //be reinitialized.
memset( lzw->lp_code, 0xFFFF, TABLE_LEN*sizeof(WORD) );
lzw->code = LZW_BASE;
lzw->cur_code_len = 9;
}
//------------------------------------------------------------------------------
VOID lzw_create(PLZW_DATA lzw, HANDLE h_sour, HANDLE h_dest)
{
WORD i;
lzw->h_code = GlobalAlloc( GHND, TABLE_LEN*sizeof(WORD) );
lzw->h_prefix = GlobalAlloc( GHND, TABLE_LEN*sizeof(WORD) );
lzw->h_suffix = GlobalAlloc( GHND, TABLE_LEN*sizeof(BYTE) );
lzw->lp_code = GlobalLock( lzw->h_code );
lzw->lp_prefix = GlobalLock( lzw->h_prefix );
lzw->lp_suffix = GlobalLock( lzw->h_suffix );
lzw->code = LZW_BASE;
lzw->cur_code_len = 9;
lzw->h_sour = h_sour;
lzw->h_dest = h_dest;
memset( lzw->lp_code, 0xFFFF, TABLE_LEN*sizeof(WORD) );}
//------------------------------------------------------------------------------
VOID lzw_destory(PLZW_DATA lzw)
{
GlobalUnlock( lzw->h_code );
GlobalUnlock( lzw->h_prefix );
GlobalUnlock( lzw->h_suffix );GlobalFree( lzw->h_code );
GlobalFree( lzw->h_prefix );
GlobalFree( lzw->h_suffix );
}
//------------------------------------------------------------------------------
#endif(2) fileio.h 定义了一些文件操作#ifndef __FILEIO_H__
#define __FILEIO_H__
//------------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
//------------------------------------------------------------------------------
HANDLE file_handle(CHAR* file_name)
{
HANDLE h_file;
h_file = CreateFile(file_name,
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_ALWAYS,
0,
NULL
);
return h_file;
}
//------------------------------------------------------------------------------
WORD load_buffer(HANDLE h_sour, PBUFFER_DATA buffer) // Load file to buffer
{
DWORD ret;
ReadFile(h_sour,buffer->lp_buffer,BUFFERSIZE,&ret,NULL);
buffer->index = 0;
buffer->top = (WORD)ret;
return (WORD)ret;
}
//------------------------------------------------------------------------------
WORD empty_buffer( PLZW_DATA lzw, PBUFFER_DATA buffer)// Output buffer to file
{

DWORD ret;
if(buffer->end_flag) // The flag mark the end of decode
{
if( buffer->by_left )
{
buffer->lp_buffer[ buffer->index++ ] = (BYTE)( buffer->dw_buffer >> 32-buffer->by_left )<<(8-buffer->by_left);
}
}
WriteFile(lzw->h_dest, buffer->lp_buffer,buffer->index,&ret,NULL);
buffer->index = 0;
buffer->top = ret;
return (WORD)ret;
}
//------------------------------------------------------------------------------
#endif

‘陆’ 如何用C语言实现数据压缩

首先你要熟悉套接字的使用，然后要对ftp协议，
包括其中的数据包，通信过程有一定了解。
c语言开发网络程序一般都是用socket套接字这一套函数，你可以去看看资料