Chrome中具有FileReader的PC8/CP437字符集 [英] PC8 / CP437 character set with filereader in Chrome

问题描述

任何人都知道是否有可能在chrome中获取FileReader API来读取带有CP437字符集的文件吗?在哪里可以列出可用的编码?目前，我的解决方法是使用CP1251 reader.readAsText(file，'CP1251')进行读取，并手动替换特殊字符，这很酷！还有其他支持此字符集的浏览器吗?还是您有一个更好的解决办法?

anyone knows if it is possible to get the FileReader API in chrome to read a file with the CP437 character set? Is there a place where I can list the available encodings? Currently, my workaround is to read it with CP1251 reader.readAsText(file, 'CP1251') and manually replace special characters, which is not cool! Is there other browsers which support this character set? Or do you have any better idea at a workaround?

仅在浏览器中解析文件，没有可用的后端.

The file is parsed only in the browser, there is no backend available.

向奥斯卡致敬

推荐答案

我遇到了同样的问题.未实现CP437(至少在Chrome和Firefox中).

I had the same problem. CP437 isn't implemented (in Chrome and Firefox at least).

解决方法转换为需要浏览器中 ArrayBuffer 支持的UTF-8:

Work around to convert to UTF-8 that requires ArrayBuffer support in the browser:

var Cp437Helper = function () {
    var cp437map = [
        '\u0000', '\u0001', '\u0002', '\u0003', '\u0004', '\u0005', '\u0006',
        '\u0007', '\u0008', '\u0009', '\u000A', '\u000B', '\u000C', '\u000D', 
        '\u000E', '\u000F', '\u0010', '\u0011', '\u0012', '\u0013', '\u0014', 
        '\u0015', '\u0016', '\u0017', '\u0018', '\u0019', '\u001A', '\u001B', 
        '\u001C', '\u001D', '\u001E', '\u001F', '\u0020', '\u0021', '\u0022', 
        '\u0023', '\u0024', '\u0025', '\u0026', '\u0027', '\u0028', '\u0029', 
        '\u002A', '\u002B', '\u002C', '\u002D', '\u002E', '\u002F', '\u0030', 
        '\u0031', '\u0032', '\u0033', '\u0034', '\u0035', '\u0036', '\u0037', 
        '\u0038', '\u0039', '\u003A', '\u003B', '\u003C', '\u003D', '\u003E', 
        '\u003F', '\u0040', '\u0041', '\u0042', '\u0043', '\u0044', '\u0045', 
        '\u0046', '\u0047', '\u0048', '\u0049', '\u004A', '\u004B', '\u004C', 
        '\u004D', '\u004E', '\u004F', '\u0050', '\u0051', '\u0052', '\u0053',
        '\u0054', '\u0055', '\u0056', '\u0057', '\u0058', '\u0059', '\u005A', 
        '\u005B', '\u005C', '\u005D', '\u005E', '\u005F', '\u0060', '\u0061', 
        '\u0062', '\u0063', '\u0064', '\u0065', '\u0066', '\u0067', '\u0068', 
        '\u0069', '\u006A', '\u006B', '\u006C', '\u006D', '\u006E', '\u006F', 
        '\u0070', '\u0071', '\u0072', '\u0073', '\u0074', '\u0075', '\u0076', 
        '\u0077', '\u0078', '\u0079', '\u007A', '\u007B', '\u007C', '\u007D', 
        '\u007E', '\u007F', '\u00C7', '\u00FC', '\u00E9', '\u00E2', '\u00E4', 
        '\u00E0', '\u00E5', '\u00E7', '\u00EA', '\u00EB', '\u00E8', '\u00EF', 
        '\u00EE', '\u00EC', '\u00C4', '\u00C5', '\u00C9', '\u00E6', '\u00C6', 
        '\u00F4', '\u00F6', '\u00F2', '\u00FB', '\u00F9', '\u00FF', '\u00D6', 
        '\u00DC', '\u00A2', '\u00A3', '\u00A5', '\u20A7', '\u0192', '\u00E1', 
        '\u00ED', '\u00F3', '\u00FA', '\u00F1', '\u00D1', '\u00AA', '\u00BA',
        '\u00BF', '\u2310', '\u00AC', '\u00BD', '\u00BC', '\u00A1', '\u00AB', 
        '\u00BB', '\u2591', '\u2592', '\u2593', '\u2502', '\u2524', '\u2561', 
        '\u2562', '\u2556', '\u2555', '\u2563', '\u2551', '\u2557', '\u255D', 
        '\u255C', '\u255B', '\u2510', '\u2514', '\u2534', '\u252C', '\u251C', 
        '\u2500', '\u253C', '\u255E', '\u255F', '\u255A', '\u2554', '\u2569', 
        '\u2566', '\u2560', '\u2550', '\u256C', '\u2567', '\u2568', '\u2564', 
        '\u2565', '\u2559', '\u2558', '\u2552', '\u2553', '\u256B', '\u256A', 
        '\u2518', '\u250C', '\u2588', '\u2584', '\u258C', '\u2590', '\u2580', 
        '\u03B1', '\u00DF', '\u0393', '\u03C0', '\u03A3', '\u03C3', '\u00B5', 
        '\u03C4', '\u03A6', '\u0398', '\u03A9', '\u03B4', '\u221E', '\u03C6', 
        '\u03B5', '\u2229', '\u2261', '\u00B1', '\u2265', '\u2264', '\u2320', 
        '\u2321', '\u00F7', '\u2248', '\u00B0', '\u2219', '\u00B7', '\u221A',
        '\u207F', '\u00B2', '\u25A0', '\u00A0'
    ];

    this.convertToUTF8 = function (buffer) {
        var out = '';
        var view = new DataView(buffer);

        var i ;
        var n = view.byteLength;
        for (i  = 0; i  < n; i ++) {
            var uint = view.getUint8(i);
            if (cp437map[ uint ] == undefined) {
                out += '/' + uint + '/';
            } else {
                out += cp437map[ uint ];
            }
        }
        return out;
    };

    if ( Cp437Helper.prototype._instance == undefined ) {
      Cp437Helper.prototype._instance = this;
    }
    return Cp437Helper.prototype._instance;
};

使用以上内容:

var getTextFromCP437File = function ( file ) {
    var reader = new FileReader();
    reader.onload = function(e) {
        var text = Cp437Helper().convertToUTF8(reader.result);
        // do something...
    };
    //reader.readAsText(file, 'cp437');
    reader.readAsArrayBuffer(file);
};

这篇关于Chrome中具有FileReader的PC8/CP437字符集的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！