can't decode about k4os.compression.lz4 HOT 5 CLOSED

补充一下：
当我使用Lz4Picker类进行操作的时候是完全OK的，只是速度略慢，我需要更快的速度。

from k4os.compression.lz4.

Unfortunately I don't read Chinese, but pickler is the simples approach:

var s = "{\"ID\":\"59fd4cb7-dd79-4f9d-953a-ac91dc0b00f9\",\"Key\":\"init\",\"Step\":2147483647,\"Datas\":null}";
var e = LZ4Pickler.Pickle(Encoding.UTF8.GetBytes(s));
var t = Encoding.UTF8.GetString(LZ4Pickler.Unpickle(e));

Debug.Assert(s == t);

If you really need to use low level functions, you need to do all the work around it.
For example, I can see that you are not using value returned by LZ4Codec.Encode(...). Well, value tells you how many bytes were used in compression, which is the value you need to use when doing LZ4Coded.Decode(...)

BTW, using GetBytes, GetString, new byte[] puts strain on GC. Try using IBufferWriter<byte> as much as possible (Pickler works with it).

from k4os.compression.lz4.

Thank you .
My English is very poor. so, I can't describe my problem clearly.

When using the LZ4Codec class to compress and decompress JSON strings, if the Length of the solution byte is set to the Length of the source byte[], it will not be decompressed. If the Length is set to Source.Length * 255, it will be decompressed correctly.

e.g.

//this is source string
            var s = "{\"ID\":\"59fd4cb7-dd79-4f9d-953a-ac91dc0b00f9\",\"Key\":\"init\",\"Step\":2147483647,\"Datas\":null}";             var srcList = new List<byte>(); 
            srcList.AddRange(System.Text.Encoding.UTF8.GetBytes(s));

//Get src byte[]
            var src = srcList.ToArray();
//Init encode byte[]
            var target = new byte[LZ4Codec.MaximumOutputSize(src.Length) ];
       
            LZ4Codec.Encode(src, 0, src.Length, target, 0, target.Length, LZ4Level.L03_HC);
           
//Data copy  
            var rarray = new byte[target.Length];
            Array.Copy(target, rarray, rarray.Length);

//init  decode byte[] 
            var r = new byte[src.Length];
            LZ4Codec.Decode(rarray, r);
// result string 
            var rs = System.Text.Encoding.UTF8.GetString(r);
//this is false rs != s,  
// But, if  s="abcdefg",this is true, rs == s
            Assert.IsTrue(rs == s);

from k4os.compression.lz4.

Pickler very good, it's so great.

from k4os.compression.lz4.

Your rarray has maximum bytes not actual bytes.
Take actualLength = LZ4Codec.Encode(...); and use it when creating var rarray = new byte[actualLength];

BUT...

your code is far from optimal. You are making many unnecesary allocation (for example: srcList.AddRange(System.Text.Encoding.UTF8.GetBytes(s)); var src = srcList.ToArray();). Stick to my previous example:

var s = "{\"ID\":\"59fd4cb7-dd79-4f9d-953a-ac91dc0b00f9\",\"Key\":\"init\",\"Step\":2147483647,\"Datas\":null}";
var e = LZ4Pickler.Pickle(Encoding.UTF8.GetBytes(s));
var t = Encoding.UTF8.GetString(LZ4Pickler.Unpickle(e));

from k4os.compression.lz4.