1
我試圖用VC++ 2010使用zlib-1.2.7來壓縮和膨脹一個文本文件。 我使用pipe.c
作爲基礎,並重寫了main()
以設置輸入/輸出文件。zlib deflate越來越Z_DATA_ERROR
我可以減壓任何文本文件,但我不能在沒有得到Z_DATA_ERROR
(-3)的情況下膨脹大文件。
inf()
和def()
不會從pipe.c
改變。
這裏是我的main()
:
int main(){
FILE *a, *b, *c;
int ret;
//ZIP
a = fopen("a_data.txt", "r");
b = fopen("b_compressedData.zip", "w");
if(a != NULL && b != NULL){
ret = def(a, b, Z_DEFAULT_COMPRESSION);
printf("%d\n", ret);
if (ret != Z_OK) zerr(ret);
fclose(a);
fclose(b);
}
//UNZIP
b = fopen("b_compressedData.zip", "r");
c = fopen("c_uncompressedData.txt", "w");
if(c != NULL && b != NULL){
ret = inf(b, c);
printf("%d\n", ret);
if (ret != Z_OK) zerr(ret);
fclose(b);
fclose(c);
}
return 0;
}
這裏是inf()
功能:
int inf(FILE *source, FILE *dest)
{
int ret;
unsigned have;
z_stream strm;
unsigned char in[CHUNK];
unsigned char out[CHUNK];
/* allocate inflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit(&strm);
if (ret != Z_OK)
return ret;
/* decompress until deflate stream ends or end of file */
do {
strm.avail_in = fread(in, 1, CHUNK, source);
if (ferror(source)) {
(void)inflateEnd(&strm);
return Z_ERRNO;
}
if (strm.avail_in == 0)
break;
strm.next_in = in;
/* run inflate() on input until output buffer not full */
do {
strm.avail_out = CHUNK;
strm.next_out = out;
ret = inflate(&strm, Z_NO_FLUSH);
assert(ret != Z_STREAM_ERROR); /* state not clobbered */
switch (ret) {
case Z_NEED_DICT:
ret = Z_DATA_ERROR; /* and fall through */
case Z_DATA_ERROR:
case Z_MEM_ERROR:
(void)inflateEnd(&strm);
return ret;
}
have = CHUNK - strm.avail_out;
if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
(void)inflateEnd(&strm);
return Z_ERRNO;
}
} while (strm.avail_out == 0);
/* done when inflate() says it's done */
} while (ret != Z_STREAM_END);
/* clean up and return */
(void)inflateEnd(&strm);
return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}
謝謝馬克,它工作!我也會按照你對文件命名的建議。 – Tuxicoman