epee::zlib_helper Namespace Reference

Functions
bool	pack (std::string &target)
bool	unpack (std::string &target)

Function Documentation

pack()

bool epee::zlib_helper::pack ( std::string & target )

inline

Definition at line 39 of file zlib_helper.h.

                                {
        std::string result_packed_buff;
 
        z_stream    zstream = {0};
        int ret = deflateInit(&zstream, Z_DEFAULT_COMPRESSION);
        if(target.size())
        {
 
            
            result_packed_buff.resize(target.size()*2, 'X');
 
            zstream.next_in = (Bytef*)target.data();
            zstream.avail_in = (uInt)target.size();
            zstream.next_out = (Bytef*)result_packed_buff.data();
            zstream.avail_out = (uInt)result_packed_buff.size();
 
            ret = deflate(&zstream, Z_FINISH);
            CHECK_AND_ASSERT_MES(ret>=0, false, "Failed to deflate. err = " << ret);
 
            if(result_packed_buff.size() != zstream.avail_out)
                result_packed_buff.resize(result_packed_buff.size()-zstream.avail_out);
 
            
            result_packed_buff.erase(0, 2);
            target.swap(result_packed_buff);
        }
 
        deflateEnd(& zstream );
        return true;
    }

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unpack()

bool epee::zlib_helper::unpack ( std::string & target )

inline

Definition at line 70 of file zlib_helper.h.

    {
        z_stream    zstream = {0};
        int ret = inflateInit(&zstream);//
 
        std::string decode_summary_buff;
        size_t  ungzip_buff_size = target.size() * 0x30;
        std::string current_decode_buff(ungzip_buff_size, 'X');
 
        while(target.size())
        {
 
            
            zstream.next_out = (Bytef*)current_decode_buff.data();
            zstream.avail_out = (uInt)ungzip_buff_size;
 
            int flag = Z_SYNC_FLUSH;
            
            static char dummy_head[2] =
            {
                0x8 + 0x7 * 0x10,
                (((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
            };
            zstream.next_in = (Bytef*) dummy_head;
            zstream.avail_in = sizeof(dummy_head);
            ret = inflate(&zstream, Z_NO_FLUSH);
            if (ret != Z_OK)
            {
                LOCAL_ASSERT(0);
                return false;
            }
            
            zstream.next_in = (Bytef*)target.data();
            zstream.avail_in = (uInt)target.size();
 
            ret = inflate(&zstream, Z_SYNC_FLUSH);
            if (ret != Z_OK && ret != Z_STREAM_END)
            {
                LOCAL_ASSERT(0);
                return false;
            }
 
            
            target.erase(0, target.size()-zstream.avail_in);
 
            
            if(ungzip_buff_size == zstream.avail_out)
            {
                LOG_ERROR("Can't unpack buffer");
                return false;
            }
 
            
            current_decode_buff.resize(ungzip_buff_size - zstream.avail_out);
            if(decode_summary_buff.size())
                decode_summary_buff += current_decode_buff;
            else
                current_decode_buff.swap(decode_summary_buff);
 
            current_decode_buff.resize(ungzip_buff_size);
        }
 
        inflateEnd(&zstream );
 
        decode_summary_buff.swap(target);
        return 1;
    }

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