压缩字符串 C#

Question

我试图缩小从 websocket 连接获得的字符串，但每次我尝试运行这段代码时，我都会收到错误消息。我还尝试使用 ascii 编码直接从字符串中获取字节，但它也没有用。

public static byte[] Decompress(string input)
{

    byte[] data = Convert.FromBase64String(input)
    byte[] decompressedArray = null;

    using (MemoryStream decompressedStream = new MemoryStream())
    {
        using (MemoryStream compressStream = new MemoryStream(data))
        {
            using (DeflateStream deflateStream = new DeflateStream(compressStream, CompressionMode.Decompress))
            {
                deflateStream.CopyTo(decompressedStream);
            }
        }
        decompressedArray = decompressedStream.ToArray();
    }
    return decompressedArray;
}

System.IO.InvalidDataException: "Block length does not match with its complement."

我尝试了此代码的几个不同变体，但没有任何效果，但我知道这是可能的，因为我可以使用此网站 http://www.txtwizard.net/compression 和 deflate 选项对其进行压缩。

我要放气的一个示例字符串：

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 ==

Answer 1

字符串 (JSON) 可能来自 GZipStream.
您可以使用其他流来解压缩数据内容：

► 您需要.Net Framework 4.7.2+ 才能正确解压数据。

请注意，压缩格式有点 off。压缩数据签名，78 : 01，可能暗示这是一个ZLib压缩字符串，所以.Net DeflateStream，它基于ZLib（来自.NET Framework 4.5), 应该解压缩数据。
7-Zip 和 WinZip 都无法打开数据（保存为二进制文件的流）。

using System.IO;
using System.IO.Compression;
using System.Text;

public static byte[] Decompress(string input)
{
    byte[] data = Convert.FromBase64String(input)

    using (var decompressedStream = new MemoryStream())
    using (var compressStream = new MemoryStream(data))
    using (var gzip = new GZipStream(compressStream, CompressionMode.Decompress)) {
        gzip.CopyTo(decompressedStream);
        return decompressedStream.ToArray();
    }
}

JSON 是 UTF8 编码的（它也适用于 ASCII 字符串）：

string json = Encoding.UTF8.GetString(Decompress(base64String));

导致（.Net Fidddle）：

[
   "room:shard1/W1N1",
   {
      "objects":{
         "5982fe1eb097071b4adc0743":{
            "energy":2440,
            "invaderHarvested":2664
         },
         "5dad1a7cef434b7d68fd5160":{
            "store":{
               "energy":1536
            }
         },
         "5dd1cf2c884de042fb6be550":{
            "hits":4100,
            "nextDecayTime":25374980
         }
      },
      "gameTime":25373981,
      "info":{
         "mode":"world"
      },
      "visual":"{\"t\":\"r\",\"x\":37,\"y\":0,\"w\":12,\"h\":6,\"s\":{\"fill\":\"black\",\"stroke\":\"white\",\"opacity\":0.25}}\n{\"t\":\"t\",\"text\":\"CPU Usage\",\"x\":43,\"y\":1,\"s\":{\"font\":0.8}}\n{\"t\":\"l\",\"x1\":37.05,\"y1\":1.5,\"x2\":48.95,\"y2\":1.5}\n{\"t\":\"t\",\"text\":\"Current Usage\",\"x\":37.5,\"y\":2.5,\"s\":{\"align\":\"left\"}}\n{\"t\":\"t\",\"text\":\"2.43 / 4\",\"x\":46.5,\"y\":2.5}\n{\"t\":\"l\",\"x1\":37.05,\"y1\":3,\"x2\":48.95,\"y2\":3}\n{\"t\":\"t\",\"text\":\"Average Usage\",\"x\":37.5,\"y\":4,\"s\":{\"align\":\"left\"}}\n{\"t\":\"t\",\"text\":\"2.82\",\"x\":46.5,\"y\":4}\n{\"t\":\"l\",\"x1\":37.05,\"y1\":4.5,\"x2\":48.95,\"y2\":4.5}\n{\"t\":\"t\",\"text\":\"Bucket Storage\",\"x\":37.5,\"y\":5.5,\"s\":{\"align\":\"left\"}}\n{\"t\":\"t\",\"text\":9998,\"x\":46.5,\"y\":5.5}\n{\"t\":\"l\",\"x1\":44,\"y1\":1.55,\"x2\":44,\"y2\":5.95}\n",
      "users":{
         "595d14d08d05b87f33a7e33a":{
            "_id":"595d14d08d05b87f33a7e33a",
            "username":"wtfrank",
            "badge":{
               "type":22,
               "color1":"#adbaeb",
               "color2":"#265fd9",
               "color3":"#1a1a1a",
               "param":-63,
               "flip":true
            }
         }
      }
   }
]

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