原文地址: https://segmentfault.com/a/1190000016547663
一些理论知识
先说一下deflate算法吧，eflate是zip压缩文件的默认算法， 其实deflate现在不光用在zip文件中, 在7z, xz等其他的压缩文件中都用， 实际上deflate只是一种压缩数据流的算法`，任何需要流式压缩的地方都可以用。
也就是说 zlib 格式, gzip 格式，是文件格式，deflate是这些文件格式使用的压缩算法。
传输方式
deflate 压缩后是二进制，通常有两种传输方式：
- 二进制
- Base64编码
二进制
PHP
// 压缩，注意：其中 ZLIB_ENCODING_DEFLATE 参数是不能少的
$data = gzdeflate(json_encode($array, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES), 6, ZLIB_ENCODING_DEFLATE);
// 使用 swoole 以二进制的方式发送
$webSocket->push($fd, $data, WEBSOCKET_OPCODE_BINARY);JavaScript
// 消息事件
ws.onmessage = function(e) {
// 转换前
console.log(e.data);
// 开始转换
var blob = e.data;
var reader = new FileReader();
reader.readAsBinaryString(blob);
reader.onload = function (evt) {
var data = pako.inflate(evt.target.result, { to: 'string' })
// 转换后
console.log(JSON.parse(data))
};
};Base64编码
通常在 WebSoctet 不会使用这种方法，但是在接口或其他文本传输中会使用到。
PHP + JavaScript
<script type='text/javascript'>
const compressedDEFLATE = '<?php echo base64_encode(gzdeflate('Compress me', 6, ZLIB_ENCODING_DEFLATE )); ?>';
function atos(arr) {
for (var i=0, l=arr.length, s='', c; c = arr[i++];)
s += String.fromCharCode(
c > 0xdf && c < 0xf0 && i < l-1
? (c & 0xf) << 12 | (arr[i++] & 0x3f) << 6 | arr[i++] & 0x3f
: c > 0x7f && i < l
? (c & 0x1f) << 6 | arr[i++] & 0x3f
: c
);
return s
}
console.log(atos(pako.ungzip(atob(compressedDEFLATE))));
</script>
Swoole WebSoctet 框架
安利一个基于 Swoole 的 WebSoctet 开发框架: MixPHP
var b64Data = 'H4sIAAAAAAAAAJ3UMQ7CMAwF0KugP2ewEzdpcxXUAbWAOiHUMqCqdyeVQAobfGXIYL8hP5ZXnEdkeNEk6vUgXTbLonC4zMjHFY/5Wm511ekdTsOCLKVp2rlIKOA2jTuBot/cr7BhobEwsbAloY8kDGyqoQ5H/oHsdwQ21cCmaspCz0L2jcYOgLHhNGw4TT1yVmBpuS9PZHWY35siqnxvimEvpE9FY4peQhfbhO0FDnuFqWAEAAA=';
var ticketData = '{"ed":"20170121 09:44:01","fs":[{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"003","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"005","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"004","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"007","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"008","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"026","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"033","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"034","oids":["0"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"035","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"037","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"038","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"041","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"042","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"047","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"046","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"048","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"051","oids":["1"]},{"usg":[1,1,1,1,1,1,1],"act":0,"fid":"053","oids":["4"]}],"qty":1,"sd":"20161021 09:44:01","cd":"72016102116762039687"}';
// Output to console
var s = unzip(b64Data);
console.log("unzipped:");
console.log(s);
var data = zip(ticketData);
console.log("zipped:");
console.log(data);
function unzip(b64Data){
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);
// // unzip
var data = pako.inflate(binData);
// Convert gunzipped byteArray back to ascii string:
strData = String.fromCharCode.apply(null, new Uint16Array(data));
return strData;
}
function zip(str){
var binaryString = pako.gzip(str, { to: 'string' });
return btoa(binaryString);
}
大佬弄帮我看看这个unzip 用PHP该怎么实现呢？