ZLibDecoder/ZLibEncoder: corruped data

[alsemenov]

ZLibEncoder is intended to compress data.
ZLibDecoder is intended to decompress compressed data.

The following example demonstrates the problem:

import "dart:io";

main() {
  List<int> data1 = new List.generate(260, (int i) => i); // anything greater than 256 is ok
  List<int> data2 = new ZLibDecoder().convert(new ZLibEncoder().convert(data1));
  if (data1.length!=data2.length){
    print("data1.length: ${data1.length} data2.length: ${data2.length}");
  }
  for (int i=0; i<data1.length; i++){
    if (data1[i]!=data2[i]){
      print("mismatch at index $i: source: ${data1[i]} decoded: ${data2[i]}");
    }
  }
}

Output:

mismatch at index 256: source: 256 decoded: 0
mismatch at index 257: source: 257 decoded: 1
mismatch at index 258: source: 258 decoded: 2
mismatch at index 259: source: 259 decoded: 3

Dart VM version: 1.24.2 (Thu Jun 22 08:55:56 2017) on "windows_x64"

[lrhn]

Input integers must be bytes (0..255). We need to document what happens if they are not.