Javascript GZIP和btoa并使用C#解压缩 [英] Javascript GZIP and btoa and decompress with C#

问题描述

我正在开发一个应用程序，其中我使用pako.gzip压缩大型JSON数据，然后使用btoa函数将其设置为base64string以便将数据发布到服务器.在我写的JavaScript中:

i am developing an application where i compress large JSON data using pako.gzip and then use the btoa function to make it base64string in order to post the data to the server. In the javascript i wrote:

    var data = JSON.stringify(JSONData);
    var ZippedData = pako.gzip(data, { to: 'string' });
    var base64String = btoa(ZippedData);
    /* post to server*/
    $http.post("URL?base64StringParam=" + base64String").then(function (response) {
        //do stuff
    });

问题是我需要在发布后再次用C#代码解压缩数据，以便对其进行其他处理.在C#代码中，我写道:

the problem is that i need to decompress the data again in C# code after posting in order to do other workings on it. In the C# code i wrote:

    byte[] data = Convert.FromBase64String(base64StringParam);
            string decodedString = System.Text.ASCIIEncoding.ASCII.GetString(data);
            Encoding enc = Encoding.Unicode;
            MemoryStream stream = new MemoryStream(enc.GetBytes(decodedString));
            GZipStream decompress = new GZipStream(stream, CompressionMode.Decompress);
            string plainDef = "";

我在这里得到错误

    using (var sr = new StreamReader(decompress))
            {
                plainDef = sr.ReadToEnd();
            }

解码时发现无效数据.

在C#中解压缩数据的任何帮助将不胜感激

any help to decompress the data back in C# will be appreciated

编辑:总结需要做的事情javascript执行以下操作:

EDIT:to sum up what needed to be done javascript does the following:

纯文本>>到>> gzip字节>>到>> base64字符串

Plain text >> to >> gzip bytes >> to >> base64 string

我需要C#来做相反的事情:

i need C# to do the reverse:

Base64 >>到>>解压缩字节>>到>>纯文本

Base64 >> to >> unzip bytes >> to >> plain text

推荐答案

在客户端使用:

let output = pako.gzip(JSON.stringify(obj));

发送为:内容类型":应用程序/八位字节流"

send as: 'Content-Type': 'application/octet-stream'

====================

=====================

然后用C#:

[HttpPost]
[Route("ReceiveCtImage")]
public int ReceiveCtImage([FromBody] byte[] data)
{
    var json = Decompress(data);
    return 1;     
}

public static string Decompress(byte[] data)
{
    // Read the last 4 bytes to get the length
    byte[] lengthBuffer = new byte[4];
    Array.Copy(data, data.Length - 4, lengthBuffer, 0, 4);
    int uncompressedSize = BitConverter.ToInt32(lengthBuffer, 0);

    var buffer = new byte[uncompressedSize];
    using (var ms = new MemoryStream(data))
    {
        using (var gzip = new GZipStream(ms, CompressionMode.Decompress))
        {
            gzip.Read(buffer, 0, uncompressedSize);
        }
    }
    string json = Encoding.UTF8.GetString(buffer); 
    return json;
}

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