Compression issues with large Inputs

[lauhon]

When trying to compress large buffers (>10kB), there is a huge size difference between the result on this libraray and other demos (for example here)

While the other demo reduces the size to 23%, msgpack-lite seems to not compress at all. With other values the compressed result is even larger than the input.

I tested it like this:

  import { encode } from 'msgpack-lite';

  const enc = encode(hugeBuffer);

  console.log({ resultLenght: enc.length, originalLength: hugeBuffer.length }, 'encoded');

Is this a shortcomming of this lib, or am I doing something wrong here?

Input I used

[
165,
190,
64,
103,
149,
183,
100,
22,
85,
122,
173,
152,
79,
125,
29,
66,
20,
54,
18,
153,
81,
13,
212,
249,
0,
0,
0,
2,
0,
203,
81,
147,
93,
197,
66,
174,
38,
217,
208,
70,
115,
129,
235,
20,
163,
46,
68,
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1,
159,
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33,
3,
217,
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222,
68,
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29,
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0,
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1,
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3,
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33,
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212,
204,
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183,
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[kawanet]

@lauhon
Let me clarify the issue.
Are you encoding an Array filled with integer numbers but not a Buffer object or an Uint8Array?

encode(new Array(165, 190, 64, 103, 149, 183, 100, 22)).length
// => 13

encode(Buffer.from([165, 190, 64, 103, 149, 183, 100, 22])).length
// => 10

encode(new Uint8Array([165, 190, 64, 103, 149, 183, 100, 22])).length
// => 10

If you are encoding an instance of a Class inherited from others, but not a bare object such as above, you may need something to encode it.

[lauhon]

Hey @kawanet, thanks for coming back to this so quickly!

So this time I used a new object of type Buffer.

buffer.length // -> 5196
Buffer.isBuffer(buffer) // -> true

I tried three things basically:

1. encode a Buffer Object directly

encode(buffer).length // -> 5199

2. encode a Uint8Array by passing the Buffer in the constructor

encode(new Uint8Array(buffer)).length // -> 5200

3. encode a Uint8Array by transforming the Buffer to Array manually

encode(buffToArr(buffer)).length //-> 5200

const buffToArr = (buf: Buffer): Uint8Array => {
  var a = new Uint8Array(buf.length);
  for (var i = 0; i < buf.length; i++) a[i] = buf[i];

  return a;
};

[kawanet]

Thanks! I could understand that you're encoding a Buffer instance or Uint8Array. What is the problem you face then?
Any msgpack libraries do not have compression feature such as Deflate/gzip etc., by themselves.

[lauhon]

Hm, maybe my expectations were off.

When trying out msgpack on the demo site, the size of the resulting array of bytes is smaller, as I said in my original comment.

So what you are saying is I need to look into something different like pako?