nodejs UTF-32的缓冲区toString函数

Question

我正在处理一个二进制文件，我试图通过NodeJs解析并存储为变量。我有一个缓冲区中的文件。根据需求文件的这部分文件是UTF-32。

41 00 00 00 55 00 00 00 54 00 00 00 4F 00 00 00 
31 00 00 00 45 00 00 00 30 00 00 00 33 00 00 00 
38 00 00 00 31 00 00 00 31 00 00 00 36 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 

var string_UserName = data.toString('utf-8', 96, 179); 
console.log('User Name: ' + string_UserName); 
//User Name: A U T O 1 E 0 3 8 1 1 6 

var string_UserName = data.toString('utf-16le', 96, 179); 
console.log('User Name: ' + string_UserName); 
//User Name: A U T O 1 E 0 3 8 1 1 6 

var string_UserName = data.toString('utf-32le', 96, 179); 
console.log('User Name: ' + string_UserName); 
//buffer.js:387 
     throw new TypeError('Unknown encoding: ' + encoding); 
    ^
TypeError: Unknown encoding: utf-32le 
    at Buffer.slowToString (buffer.js:387:17) 
    at Buffer.toString (buffer.js:399:31) 

根据Node Documentation for Buffer没有内置转换为字符串utf-32的东西。

是否有一个NPM模块可以扩展BUFFER以允许此转换，或者是否需要编写一个buffer.prototype.toString（）函数来扩展toString（），以允许进行此转换？如果有的话，是否有人已经有一个他们使用？

---

这是文件头256/FF字节的HEX转储。

AF 03 00 00 D0 00 00 00 16 81 03 1E 0A 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
41 00 00 00 55 00 00 00 54 00 00 00 4F 00 00 00 
31 00 00 00 45 00 00 00 30 00 00 00 33 00 00 00 
38 00 00 00 31 00 00 00 31 00 00 00 36 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 32 30 31 36 30 31 32 32 31 32 33 35 
34 32 30 30 30 30 30 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 

使用@弗拉德的答案

Iconv = require('iconv').Iconv; 
var convertUTF32 = new Iconv('UTF-32', 'UTF-8'); 
var string_UserName = convertUTF32.convert(data.slice(96, 179)); 
console.log('User Name: ' + string_UserName); 

后，我从ICONV得到一个错误：

C:\nodeCode\node_modules\iconv\lib\iconv.js:145 
      throw errnoException('EINVAL', 'Incomplete character sequence.'); 
     ^

Error: Incomplete character sequence. 
    at errnoException (C:\nodeCode\node_modules\iconv\lib\iconv.js:169:13) 
    at Object.convert (C:\nodeCode\node_modules\iconv\lib\iconv.js:145:17) 
    at Iconv.convert (C:\nodeCode\node_modules\iconv\lib\iconv.js:59:12) 
    at C:\nodeCode\metaProc.js:49:37 
    at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:404:3) 
    at fs.js:312:11 
    at nextTickCallbackWith0Args (node.js:456:9) 
    at process._tickCallback (node.js:385:13) 

有人认为，这是因为data.slice(96, 179)不是4的倍数，但我可以不明白，自96以来，如果第一个字节和179是4字节组（176,177,178,179）的最后一个字节。 180将是下一个字节的开始而不是结束。

任何帮助，将不胜感激。

---

终于搞清楚我做错了什么。 @Vlad大部分都是对的。我没有//TRANSLIT//IGNORE那里，并且不得不改变结束索引1，因为buffer.slice看起来像Half-Closed Interval [96,180）而不是inclusive [96,179]就像我想的那样。

我真正需要的是什么：

Iconv = require('iconv').Iconv; 
var iconv32 = new Iconv('UTF-32LE', 'UTF-8//TRANSLIT//IGNORE'); 
var string4_UserName = iconv32.convert(data.slice(96,180)).toString('utf-8'); 
console.log('User Name: ' + string4_UserName); 

Answer 1

是的，有经常用于缓冲解码的iconv npm module。

按照其自述，你可以尝试：

var Iconv = require('iconv').Iconv; 
var iconv = new Iconv('UTF-32LE', 'UTF-8'); 
var string_UserName = iconv.convert(data.slice(96, 179)).toString('utf8'); 
console.log('User Name: ' + string_UserName); 

让我知道它是否适合你。