c++ - zlib 解压gzip/deflate 报错问题？
加入http头：wstring szHeader = L"Accept-Encoding: gzip,deflate";
用网上提供的这段代码可以成功解压http gzip压缩的网页 ，比如http://www.sohu.com/可以成功解压
但是压解deflate压缩的网页不行(比如这个网站:http://122.114.115.247:8080/?...，报错Z_DATA_ERROR
代码如下:
/* HTTP gzip decompress */
/* 参数1.压缩数据 2.数据长度 3.解压数据 4.解压后长度 */
int HttpRequests::httpgzdecompress(Byte* zdata, uLong nzdata,
Byte* data, uLong* ndata)
{
int err = 0;
z_stream d_stream = {
0
}; /* decompression stream */
static char dummy_head[2] = {
0x8 + 0x7 * 0x10,
(((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
};
d_stream.zalloc = (alloc_func) 0;
d_stream.zfree = (free_func) 0;
d_stream.opaque = (voidpf) 0;
d_stream.next_in = zdata;
d_stream.avail_in = 0;
d_stream.next_out = data;
if (inflateInit2(&d_stream, 47) != Z_OK)
return(-1);
while (d_stream.total_out < *ndata && d_stream.total_in < nzdata) {
d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
if ((err = inflate(&d_stream, Z_NO_FLUSH)) == Z_STREAM_END)
break;
if (err != Z_OK) {
if (err == Z_DATA_ERROR) {
d_stream.next_in = (Bytef *) dummy_head;
d_stream.avail_in = sizeof(dummy_head);
if ((err = inflate(&d_stream, Z_NO_FLUSH)) != Z_OK) {
return(-1);
}
} else
return(-1);
}
}
if (inflateEnd(&d_stream) != Z_OK)
return(-1);
*ndata = d_stream.total_out;
return(0);
}解压deflate压缩网页不行，gzip可以，
