Javascript ZLIB 解压 - 客户端
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ZLIB Decompression - Client Side
提问by Rajeev Raina
I am receiving data as an "ZLIB" compressed inputstream.
我正在接收作为“ ZLIB”压缩输入流的数据。
Using Javascript/Ajax/JQuery, I need to uncompress it on the client side.
使用 Javascript/Ajax/JQuery，我需要在客户端解压缩它。
Is there a way to do so? Please help.
有没有办法这样做？请帮忙。
I already have this working in JAVA as below, but need to do this on Client Side.
我已经在 JAVA 中进行了如下操作，但需要在客户端执行此操作。
url = new URL(getCodeBase(), dataSrcfile);
URLConnection urlConn = url.openConnection();
urlConn.setUseCaches(false);
InputStream in = urlConn.getInputStream();
InflaterInputStream inflate = new InflaterInputStream(in);
InputStreamReader inputStreamReader = new InputStreamReader(inflate);
InputStreamReader inputStreamReader = new InputStreamReader(in);
BufferedReader bufReader = new BufferedReader(inputStreamReader);
// Read until no more '#'
int i = 0;
int nHidden = 0;
String line1;
do //------------------------Parsing Starts Here
{
line1 = bufReader.readLine();
.............
...... so on
回答by Redsandro
Pakois a full and modern Zlibport.
Pako是一个完整的现代Zlib港口。
Here is a very simple example and you can work from there.
这是一个非常简单的示例，您可以从那里开始工作。
Get pako.jsand you can decompress byteArray like so:
获取pako.js，你可以像这样解压 byteArray：
<html>
<head>
<title>Gunzipping binary gzipped string</title>
<script type="text/javascript" src="pako.js"></script>
<script type="text/javascript">
// Get datastream as Array, for example:
var charData = [31,139,8,0,0,0,0,0,0,3,5,193,219,13,0,16,16,4,192,86,214,151,102,52,33,110,35,66,108,226,60,218,55,147,164,238,24,173,19,143,241,18,85,27,58,203,57,46,29,25,198,34,163,193,247,106,179,134,15,50,167,173,148,48,0,0,0];
// Turn number array into byte-array
var binData = new Uint8Array(charData);
// Pako magic
var data = pako.inflate(binData);
// Convert gunzipped byteArray back to ascii string:
var strData = String.fromCharCode.apply(null, new Uint16Array(data));
// Output to console
console.log(strData);
</script>
</head>
<body>
Open up the developer console.
</body>
</html>
Running example: http://jsfiddle.net/9yH7M/
运行示例：http: //jsfiddle.net/9yH7M/
Alternatively you can base64 encode the array before you send it over as the Array takes up a lot of overhead when sending as JSON or XML. Decode likewise:
或者，您可以在发送数组之前对数组进行 base64 编码，因为在以 JSON 或 XML 格式发送时，数组会占用大量开销。同样解码：
// Get some base64 encoded binary data from the server. Imagine we got this:
var b64Data = 'H4sIAAAAAAAAAwXB2w0AEBAEwFbWl2Y0IW4jQmziPNo3k6TuGK0Tj/ESVRs6yzkuHRnGIqPB92qzhg8yp62UMAAAAA==';
// Decode base64 (convert ascii to binary)
var strData = atob(b64Data);
// Convert binary string to character-number array
var charData = strData.split('').map(function(x){return x.charCodeAt(0);});
// Turn number array into byte-array
var binData = new Uint8Array(charData);
// Pako magic
var data = pako.inflate(binData);
// Convert gunzipped byteArray back to ascii string:
var strData = String.fromCharCode.apply(null, new Uint16Array(data));
// Output to console
console.log(strData);
Running example: http://jsfiddle.net/9yH7M/1/
运行示例：http: //jsfiddle.net/9yH7M/1/
To go more advanced, here is the pakoAPI documentation.
为了更高级，这里是pakoAPI 文档。
回答by user1009908
A more recent offering is https://github.com/imaya/zlib.js
更新的产品是https://github.com/imaya/zlib.js
I think it's much better than the alternatives.
我认为它比替代品要好得多。
回答by Alfred Wassermann
Our library JSXGraph contains the deflate, unzip and gunzip algorithm. Please, have a look at jsxcompressor (a spin-off from JSXGraph, see http://jsxgraph.uni-bayreuth.de/wp/download/) or at Utils.js in the source code.
我们的库 JSXGraph 包含 deflate、unzip 和 gunzip 算法。请查看源代码中的jsxcompressor（JSXGraph 的衍生产品，请参阅http://jsxgraph.uni-bayreuth.de/wp/download/）或 Utils.js。
回答by cg.
Just as the first comments to your question suggest, I would suspect that you actually want the browser to handle the decompression. If I am mistaken, you might want to check out the JSXGraphlibrary, it is supposed to contain pure JS implementations for deflate and unzip.
正如对您的问题的第一条评论所暗示的那样，我怀疑您实际上希望浏览器处理解压。如果我弄错了，您可能想查看JSXGraph库，它应该包含用于 deflate 和 unzip 的纯JS 实现。
回答by Vitaly
Try pako https://github.com/nodeca/pako, it's not just inflate/deflate, but exact zlib port to javascript, with almost all features and options supported. Also, it's the fastest implementation in modern browsers.
尝试 pako https://github.com/nodeca/pako，它不仅是充气/放气，而且是 javascript 的精确 zlib 端口，几乎支持所有功能和选项。此外，它是现代浏览器中最快的实现。
回答by marcus256
The js-deflateproject by dankogai may be what you are looking for. I haven't actually tried it, but the rawinflate.js code seems fairly minimal, and should be able to decompress DEFLATE/zlib:ed data.
dankogai的js-deflate项目可能就是你要找的。我还没有真正尝试过，但是 rawinflate.js 代码看起来相当少，应该能够解压缩 DEFLATE/zlib:ed 数据。
回答by tanktg
Browserify-zlibworks perfectly for me, it uses pako and has the exact same api as zlib. After I struggled for days with compressing/decompressing zlib encoded payloads in client side with pako, I can say that browserify-zlib is really convenient.
Browserify-zlib非常适合我，它使用 pako 并具有与 zlib 完全相同的 API。在我用 pako 在客户端压缩/解压缩 zlib 编码的有效负载方面挣扎了几天之后，我可以说 browserify-zlib 真的很方便。
回答by summer
you should see zlib rfc from:zlib rfc
你应该看到 zlib rfc 来自：zlib rfc
the javascript inflate code I tested:inflate in Javascriptthe java code I wrote:
我测试的 javascript 膨胀代码：在 Javascript 中膨胀我写的 java 代码：
static public byte[] compress(byte[] input) {
Deflater deflater = new Deflater();
deflater.setInput(input, 0, input.length);
deflater.finish();
byte[] buff = new byte[input.length + 50];
deflater.deflate(buff);
int compressedSize = deflater.getTotalOut();
if (deflater.getTotalIn() != input.length)
return null;
byte[] output = new byte[compressedSize - 6];
System.arraycopy(buff, 2, output, 0, compressedSize - 6);// del head and
// foot byte
return output;
}
The very Important thing is in deflate in Java you must cut the head 2 byte,foot 4 byte,to get the raw deflate.
非常重要的是在 Java 中的 deflate 中，您必须将头部 2 字节，脚部 4 字节切掉，以获得原始的 deflate。
