Zlib充氣和縮小錯誤

Question

嗨，大家我基本上是試圖使用zlib庫，但我有麻煩時，我試圖膨脹自我縮小的文件，雖然當我膨脹其他zlib'd文件它工作正常。

的壓縮代碼：

#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

Answer 1

你不檢查任何返回代碼。你怎麼可能期望知道發生了什麼？ 檢查所有可能返回錯誤的函數的返回碼！

可能沒有足夠的空間提供壓縮和/或解壓縮。來自inflate()和compress()的返回碼指示是否是這種情況。

順便說一下，你malloc()inflated兩次，覆蓋第一個導致大量內存泄漏。

另外你blithely轉換一個int指針爲無符號長指針。如果他們有不同的長度，那麼你會有一個問題。

Answer 2

其實，我必須定義ZLIB_WINAPI才能使用http://www.winimage.com/zLibDll/zlib125dll.zip。現在它可以工作