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Edit File : sbcs-codec.js \| Size : 2.15 KB
"use strict"; var Buffer = require("safer-buffer").Buffer; // Single-byte codec. Needs a 'chars' string parameter that contains 256 or 128 chars that // correspond to encoded bytes (if 128 - then lower half is ASCII). exports._sbcs = SBCSCodec; function SBCSCodec(codecOptions, iconv) { if (!codecOptions) throw new Error("SBCS codec is called without the data.") // Prepare char buffer for decoding. if (!codecOptions.chars \|\| (codecOptions.chars.length !== 128 && codecOptions.chars.length !== 256)) throw new Error("Encoding '"+codecOptions.type+"' has incorrect 'chars' (must be of len 128 or 256)"); if (codecOptions.chars.length === 128) { var asciiString = ""; for (var i = 0; i < 128; i++) asciiString += String.fromCharCode(i); codecOptions.chars = asciiString + codecOptions.chars; } this.decodeBuf = new Buffer.from(codecOptions.chars, 'ucs2'); // Encoding buffer. var encodeBuf = new Buffer.alloc(65536, iconv.defaultCharSingleByte.charCodeAt(0)); for (var i = 0; i < codecOptions.chars.length; i++) encodeBuf[codecOptions.chars.charCodeAt(i)] = i; this.encodeBuf = encodeBuf; } SBCSCodec.prototype.encoder = SBCSEncoder; SBCSCodec.prototype.decoder = SBCSDecoder; function SBCSEncoder(options, codec) { this.encodeBuf = codec.encodeBuf; } SBCSEncoder.prototype.write = function(str) { var buf = Buffer.alloc(str.length); for (var i = 0; i < str.length; i++) buf[i] = this.encodeBuf[str.charCodeAt(i)]; return buf; } SBCSEncoder.prototype.end = function() { } function SBCSDecoder(options, codec) { this.decodeBuf = codec.decodeBuf; } SBCSDecoder.prototype.write = function(buf) { // Strings are immutable in JS -> we use ucs2 buffer to speed up computations. var decodeBuf = this.decodeBuf; var newBuf = Buffer.alloc(buf.length2); var idx1 = 0, idx2 = 0; for (var i = 0; i < buf.length; i++) { idx1 = buf[i]2; idx2 = i*2; newBuf[idx2] = decodeBuf[idx1]; newBuf[idx2+1] = decodeBuf[idx1+1]; } return newBuf.toString('ucs2'); } SBCSDecoder.prototype.end = function() { } Back

Edit File : sbcs-codec.js | Size : 2.15 KB

"use strict";
var Buffer = require("safer-buffer").Buffer;

// Single-byte codec. Needs a 'chars' string parameter that contains 256 or 128 chars that
// correspond to encoded bytes (if 128 - then lower half is ASCII).

exports._sbcs = SBCSCodec;
function SBCSCodec(codecOptions, iconv) {
    if (!codecOptions)
        throw new Error("SBCS codec is called without the data.")
    
    // Prepare char buffer for decoding.
    if (!codecOptions.chars || (codecOptions.chars.length !== 128 && codecOptions.chars.length !== 256))
        throw new Error("Encoding '"+codecOptions.type+"' has incorrect 'chars' (must be of len 128 or 256)");
    
    if (codecOptions.chars.length === 128) {
        var asciiString = "";
        for (var i = 0; i < 128; i++)
            asciiString += String.fromCharCode(i);
        codecOptions.chars = asciiString + codecOptions.chars;
    }

this.decodeBuf = new Buffer.from(codecOptions.chars, 'ucs2');
    
    // Encoding buffer.
    var encodeBuf = new Buffer.alloc(65536, iconv.defaultCharSingleByte.charCodeAt(0));

for (var i = 0; i < codecOptions.chars.length; i++)
        encodeBuf[codecOptions.chars.charCodeAt(i)] = i;

this.encodeBuf = encodeBuf;
}

SBCSCodec.prototype.encoder = SBCSEncoder;
SBCSCodec.prototype.decoder = SBCSDecoder;

function SBCSEncoder(options, codec) {
    this.encodeBuf = codec.encodeBuf;
}

SBCSEncoder.prototype.write = function(str) {
    var buf = Buffer.alloc(str.length);
    for (var i = 0; i < str.length; i++)
        buf[i] = this.encodeBuf[str.charCodeAt(i)];
    
    return buf;
}

SBCSEncoder.prototype.end = function() {
}

function SBCSDecoder(options, codec) {
    this.decodeBuf = codec.decodeBuf;
}

SBCSDecoder.prototype.write = function(buf) {
    // Strings are immutable in JS -> we use ucs2 buffer to speed up computations.
    var decodeBuf = this.decodeBuf;
    var newBuf = Buffer.alloc(buf.length*2);
    var idx1 = 0, idx2 = 0;
    for (var i = 0; i < buf.length; i++) {
        idx1 = buf[i]*2; idx2 = i*2;
        newBuf[idx2] = decodeBuf[idx1];
        newBuf[idx2+1] = decodeBuf[idx1+1];
    }
    return newBuf.toString('ucs2');
}

SBCSDecoder.prototype.end = function() {
}

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