C语言 HTTP gzip 解压（使用zlib）

最新推荐文章于 2021-05-21 02:12:09 发布

诸葛亮挥泪斩马蓉

最新推荐文章于 2021-05-21 02:12:09 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/qq_42330427/article/details/98958084

本文详细介绍了使用CURL库进行数据解压缩的过程，包括deflate和gzip两种类型。通过z_stream结构体和inflate函数，文章展示了如何初始化解压流、进行解压操作以及结束解压流程。

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/****************************************************************
* @ type:
* 0 --deflate
* 1 --gzip
****************************************************************/
int ZEXPORT CURL_DownloadDecompressData (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int type)
{
z_stream stream;
int err;

stream.next_in = (Bytef*)source;
stream.avail_in = (uInt)sourceLen;
/* Check for source > 64K on 16-bit machine: */
if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;

stream.next_out = dest;
stream.avail_out = (uInt)*destLen;
if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;

stream.zalloc = (alloc_func)0;
stream.zfree = (free_func)0;

if (type == 1)
{
err = inflateInit2(&stream, MAX_WBITS + 32);
}
else
{
err = inflateInit(&stream);/*conexant Change it*/
}
if (err != Z_OK) return err;

err = inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END) {
inflateEnd(&stream);
if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
return Z_DATA_ERROR;
return err;
}
*destLen = stream.total_out;

err = inflateEnd(&stream);
return err;
}