c语言使用zlib实现文本字符的gzip压缩与gzip解压缩

网络上找到的好多方法在解压缩字符串的时候会丢失字符，这里是解决方法:

http://stackoverflow.com/questions/21186535/compressing-decompressing-char-array-using-zlib-some-characters-missing

基于此，笔者修改了一下，由于是初学者，只按照编译器不报错的原则修改了一下，能运行

打开vc++6.0新建控制台程序程序,配置好zdll.lib,把zlib1.dll放置到合适的位置

主程序main.cpp如下

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "zlib.h"

int main()
{
  const char *istream = "some foo汉字";
  uLong srcLen = strlen(istream)+1;      // +1 for the trailing `\0`
  uLong destLen = compressBound(srcLen); // this is how you should estimate size 
                                         // needed for the buffer
  unsigned char* ostream = (unsigned char*)malloc(destLen);
  int res = compress(ostream, &destLen, (const unsigned char *)istream, srcLen); 
  // destLen is now the size of actuall buffer needed for compression
  // you don't want to uncompress whole buffer later, just the used part
  if(res == Z_BUF_ERROR){
    printf("Buffer was too small!\n");
    return 1;
  }
  if(res ==  Z_MEM_ERROR){
    printf("Not enough memory for compression!\n");
    return 2;
  }

  unsigned char *i2stream = ostream;
  char* o2stream = (char *)malloc(srcLen);
  uLong destLen2 = destLen; //destLen is the actual size of the compressed buffer
  int des = uncompress((unsigned char *)o2stream, &srcLen, i2stream, destLen2);
  printf("%s\n", o2stream);
  return 0;
}

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