[英]Zlib inflate and deflate errors
大家好,我基本上是在嘗試使用zlib庫,但是當我嘗試對自定義文件進行充氣時會遇到麻煩,盡管當我對其他zlib´d文件進行充氣時效果很好。
壓縮代碼:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef unsigned char BYTE;
typedef unsigned int UINT;
#include "zlib.h"
#define HEADERSIZE (1024)
#define CHUNKSIZE 4096
#define SWAPINT(x) (((x)&0xFF) << 24)|(((x)&0xFF00) << 8) | (((x)&0xFF0000) >> 8) | (((x)&0xFF000000) >> 24)
#define DEFLATESIZE 65536
const char *mz_error(int err)
{
static struct { int m_err; const char *m_pDesc; } s_error_descs[] =
{
{ Z_OK, "" }, { Z_STREAM_END, "stream end" }, { Z_NEED_DICT, "need dictionary" }, { Z_ERRNO, "file error" }, { Z_STREAM_ERROR, "stream error" },
{ Z_DATA_ERROR, "data error" }, { Z_MEM_ERROR, "out of memory" }, { Z_BUF_ERROR, "buf error" }, { Z_VERSION_ERROR, "version error" }
};
UINT i; for (i = 0; i < sizeof(s_error_descs) / sizeof(s_error_descs[0]); ++i) if (s_error_descs[i].m_err == err) return s_error_descs[i].m_pDesc;
return NULL;
}
char* myinflate(char* buffer, int bufsize, int* inflatedSize)
{
BYTE tmpinf[DEFLATESIZE];
char* inflated=(char*)malloc(DEFLATESIZE);
int ret,have;
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = bufsize;
strm.next_in = (Bytef*)buffer;
strm.avail_out = sizeof(tmpinf);
strm.next_out = tmpinf;
ret = inflateInit(&strm);
printf("%s",mz_error(ret));
ret = inflate(&strm, Z_FINISH);
printf("%s",mz_error(ret));
if(ret == Z_DATA_ERROR)
printf(strm.msg);
inflateEnd(&strm);
have = strm.total_out;
printf("%d\n",have);
memcpy(inflated,tmpinf,have);
*inflatedSize = have;
return inflated;
}
char* mydeflate(char* buffer, int bufsize, int* deflatedSize)
{
BYTE tmpdef[CHUNKSIZE*4];
char* deflated=(char*)malloc(DEFLATESIZE);
int have,ret;
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = bufsize;
strm.next_in = (Bytef*)buffer;
strm.avail_out = sizeof(tmpdef);
strm.next_out = tmpdef;
ret = deflateInit(&strm,Z_DEFAULT_COMPRESSION);
printf("%s",mz_error(ret));
ret = deflate(&strm, Z_FINISH);
printf("%s",mz_error(ret));
ret = deflateEnd(&strm);
printf("%s",mz_error(ret));
have = strm.total_out;
printf("%d\n",have);
memcpy(deflated,tmpdef,have);
*deflatedSize = have;
return deflated;
}
int main()
{
FILE* fptr = fopen("test.in","rb");
fseek (fptr, 0, SEEK_END);
int size = ftell(fptr);
fseek (fptr, 0, SEEK_SET);
char* buffer = (char*)malloc(size);
fread(buffer,1,size,fptr);
int infsize,defsize;
char* buf = myinflate(buffer,size,&infsize);
FILE* out = fopen("testinf.hex","wb");
fwrite(buf,1,infsize,out);
fclose(out);
char* buf2 = mydeflate(buf,infsize,&defsize);
out = fopen("testdef.hex","wb");
fwrite(buf2,1,defsize,out);
fclose(out);
int buf3size;
char* buf3 = myinflate(buf2,defsize,&buf3size);
out = fopen("testinfdef.hex","wb");
fwrite(buf3,1,buf3size,out);
}
http://www.filehosting.org/file/details/364574/eEyzAbMuCp93MmGk/test.in
您沒有檢查任何返回碼。 您怎么可能期望知道發生了什么事? 檢查所有可能返回錯誤的函數的返回碼!
可能根本沒有提供足夠的空間用於壓縮和/或解壓縮。 inflate()
和compress()
的返回代碼表明是否是這種情況。
順便說一下,您的malloc()
inflated
兩次,覆蓋了第一個,導致大量內存泄漏。
同樣,您會巧妙地將int指針轉換為無符號的long指針。 如果它們的長度不同,那么您將遇到問題。
實際上,我必須定義ZLIB_WINAPI才能使它們與http://www.winimage.com/zLibDll/zlib125dll.zip一起使用 。 現在可以了
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.