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Edit File : internal.js \| Size : 5.97 KB
"use strict"; var Buffer = require("safer-buffer").Buffer; // Export Node.js internal encodings. module.exports = { // Encodings utf8: { type: "_internal", bomAware: true}, cesu8: { type: "_internal", bomAware: true}, unicode11utf8: "utf8", ucs2: { type: "_internal", bomAware: true}, utf16le: "ucs2", binary: { type: "_internal" }, base64: { type: "_internal" }, hex: { type: "_internal" }, // Codec. _internal: InternalCodec, }; //------------------------------------------------------------------------------ function InternalCodec(codecOptions, iconv) { this.enc = codecOptions.encodingName; this.bomAware = codecOptions.bomAware; if (this.enc === "base64") this.encoder = InternalEncoderBase64; else if (this.enc === "cesu8") { this.enc = "utf8"; // Use utf8 for decoding. this.encoder = InternalEncoderCesu8; // Add decoder for versions of Node not supporting CESU-8 if (Buffer.from('eda0bdedb2a9', 'hex').toString() !== '💩') { this.decoder = InternalDecoderCesu8; this.defaultCharUnicode = iconv.defaultCharUnicode; } } } InternalCodec.prototype.encoder = InternalEncoder; InternalCodec.prototype.decoder = InternalDecoder; //------------------------------------------------------------------------------ // We use node.js internal decoder. Its signature is the same as ours. var StringDecoder = require('string_decoder').StringDecoder; if (!StringDecoder.prototype.end) // Node v0.8 doesn't have this method. StringDecoder.prototype.end = function() {}; function InternalDecoder(options, codec) { StringDecoder.call(this, codec.enc); } InternalDecoder.prototype = StringDecoder.prototype; //------------------------------------------------------------------------------ // Encoder is mostly trivial function InternalEncoder(options, codec) { this.enc = codec.enc; } InternalEncoder.prototype.write = function(str) { return Buffer.from(str, this.enc); } InternalEncoder.prototype.end = function() { } //------------------------------------------------------------------------------ // Except base64 encoder, which must keep its state. function InternalEncoderBase64(options, codec) { this.prevStr = ''; } InternalEncoderBase64.prototype.write = function(str) { str = this.prevStr + str; var completeQuads = str.length - (str.length % 4); this.prevStr = str.slice(completeQuads); str = str.slice(0, completeQuads); return Buffer.from(str, "base64"); } InternalEncoderBase64.prototype.end = function() { return Buffer.from(this.prevStr, "base64"); } //------------------------------------------------------------------------------ // CESU-8 encoder is also special. function InternalEncoderCesu8(options, codec) { } InternalEncoderCesu8.prototype.write = function(str) { var buf = Buffer.alloc(str.length * 3), bufIdx = 0; for (var i = 0; i < str.length; i++) { var charCode = str.charCodeAt(i); // Naive implementation, but it works because CESU-8 is especially easy // to convert from UTF-16 (which all JS strings are encoded in). if (charCode < 0x80) buf[bufIdx++] = charCode; else if (charCode < 0x800) { buf[bufIdx++] = 0xC0 + (charCode >>> 6); buf[bufIdx++] = 0x80 + (charCode & 0x3f); } else { // charCode will always be < 0x10000 in javascript. buf[bufIdx++] = 0xE0 + (charCode >>> 12); buf[bufIdx++] = 0x80 + ((charCode >>> 6) & 0x3f); buf[bufIdx++] = 0x80 + (charCode & 0x3f); } } return buf.slice(0, bufIdx); } InternalEncoderCesu8.prototype.end = function() { } //------------------------------------------------------------------------------ // CESU-8 decoder is not implemented in Node v4.0+ function InternalDecoderCesu8(options, codec) { this.acc = 0; this.contBytes = 0; this.accBytes = 0; this.defaultCharUnicode = codec.defaultCharUnicode; } InternalDecoderCesu8.prototype.write = function(buf) { var acc = this.acc, contBytes = this.contBytes, accBytes = this.accBytes, res = ''; for (var i = 0; i < buf.length; i++) { var curByte = buf[i]; if ((curByte & 0xC0) !== 0x80) { // Leading byte if (contBytes > 0) { // Previous code is invalid res += this.defaultCharUnicode; contBytes = 0; } if (curByte < 0x80) { // Single-byte code res += String.fromCharCode(curByte); } else if (curByte < 0xE0) { // Two-byte code acc = curByte & 0x1F; contBytes = 1; accBytes = 1; } else if (curByte < 0xF0) { // Three-byte code acc = curByte & 0x0F; contBytes = 2; accBytes = 1; } else { // Four or more are not supported for CESU-8. res += this.defaultCharUnicode; } } else { // Continuation byte if (contBytes > 0) { // We're waiting for it. acc = (acc << 6) \| (curByte & 0x3f); contBytes--; accBytes++; if (contBytes === 0) { // Check for overlong encoding, but support Modified UTF-8 (encoding NULL as C0 80) if (accBytes === 2 && acc < 0x80 && acc > 0) res += this.defaultCharUnicode; else if (accBytes === 3 && acc < 0x800) res += this.defaultCharUnicode; else // Actually add character. res += String.fromCharCode(acc); } } else { // Unexpected continuation byte res += this.defaultCharUnicode; } } } this.acc = acc; this.contBytes = contBytes; this.accBytes = accBytes; return res; } InternalDecoderCesu8.prototype.end = function() { var res = 0; if (this.contBytes > 0) res += this.defaultCharUnicode; return res; } Back

Edit File : internal.js | Size : 5.97 KB

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

// Export Node.js internal encodings.

module.exports = {
    // Encodings
    utf8:   { type: "_internal", bomAware: true},
    cesu8:  { type: "_internal", bomAware: true},
    unicode11utf8: "utf8",

ucs2:   { type: "_internal", bomAware: true},
    utf16le: "ucs2",

binary: { type: "_internal" },
    base64: { type: "_internal" },
    hex:    { type: "_internal" },

// Codec.
    _internal: InternalCodec,
};

//------------------------------------------------------------------------------

function InternalCodec(codecOptions, iconv) {
    this.enc = codecOptions.encodingName;
    this.bomAware = codecOptions.bomAware;

if (this.enc === "base64")
        this.encoder = InternalEncoderBase64;
    else if (this.enc === "cesu8") {
        this.enc = "utf8"; // Use utf8 for decoding.
        this.encoder = InternalEncoderCesu8;

// Add decoder for versions of Node not supporting CESU-8
        if (Buffer.from('eda0bdedb2a9', 'hex').toString() !== '💩') {
            this.decoder = InternalDecoderCesu8;
            this.defaultCharUnicode = iconv.defaultCharUnicode;
        }
    }
}

InternalCodec.prototype.encoder = InternalEncoder;
InternalCodec.prototype.decoder = InternalDecoder;

//------------------------------------------------------------------------------

// We use node.js internal decoder. Its signature is the same as ours.
var StringDecoder = require('string_decoder').StringDecoder;

if (!StringDecoder.prototype.end) // Node v0.8 doesn't have this method.
    StringDecoder.prototype.end = function() {};

function InternalDecoder(options, codec) {
    StringDecoder.call(this, codec.enc);
}

InternalDecoder.prototype = StringDecoder.prototype;

//------------------------------------------------------------------------------
// Encoder is mostly trivial

function InternalEncoder(options, codec) {
    this.enc = codec.enc;
}

InternalEncoder.prototype.write = function(str) {
    return Buffer.from(str, this.enc);
}

InternalEncoder.prototype.end = function() {
}

//------------------------------------------------------------------------------
// Except base64 encoder, which must keep its state.

function InternalEncoderBase64(options, codec) {
    this.prevStr = '';
}

InternalEncoderBase64.prototype.write = function(str) {
    str = this.prevStr + str;
    var completeQuads = str.length - (str.length % 4);
    this.prevStr = str.slice(completeQuads);
    str = str.slice(0, completeQuads);

return Buffer.from(str, "base64");
}

InternalEncoderBase64.prototype.end = function() {
    return Buffer.from(this.prevStr, "base64");
}

//------------------------------------------------------------------------------
// CESU-8 encoder is also special.

function InternalEncoderCesu8(options, codec) {
}

InternalEncoderCesu8.prototype.write = function(str) {
    var buf = Buffer.alloc(str.length * 3), bufIdx = 0;
    for (var i = 0; i < str.length; i++) {
        var charCode = str.charCodeAt(i);
        // Naive implementation, but it works because CESU-8 is especially easy
        // to convert from UTF-16 (which all JS strings are encoded in).
        if (charCode < 0x80)
            buf[bufIdx++] = charCode;
        else if (charCode < 0x800) {
            buf[bufIdx++] = 0xC0 + (charCode >>> 6);
            buf[bufIdx++] = 0x80 + (charCode & 0x3f);
        }
        else { // charCode will always be < 0x10000 in javascript.
            buf[bufIdx++] = 0xE0 + (charCode >>> 12);
            buf[bufIdx++] = 0x80 + ((charCode >>> 6) & 0x3f);
            buf[bufIdx++] = 0x80 + (charCode & 0x3f);
        }
    }
    return buf.slice(0, bufIdx);
}

InternalEncoderCesu8.prototype.end = function() {
}

//------------------------------------------------------------------------------
// CESU-8 decoder is not implemented in Node v4.0+

function InternalDecoderCesu8(options, codec) {
    this.acc = 0;
    this.contBytes = 0;
    this.accBytes = 0;
    this.defaultCharUnicode = codec.defaultCharUnicode;
}

InternalDecoderCesu8.prototype.write = function(buf) {
    var acc = this.acc, contBytes = this.contBytes, accBytes = this.accBytes, 
        res = '';
    for (var i = 0; i < buf.length; i++) {
        var curByte = buf[i];
        if ((curByte & 0xC0) !== 0x80) { // Leading byte
            if (contBytes > 0) { // Previous code is invalid
                res += this.defaultCharUnicode;
                contBytes = 0;
            }

if (curByte < 0x80) { // Single-byte code
                res += String.fromCharCode(curByte);
            } else if (curByte < 0xE0) { // Two-byte code
                acc = curByte & 0x1F;
                contBytes = 1; accBytes = 1;
            } else if (curByte < 0xF0) { // Three-byte code
                acc = curByte & 0x0F;
                contBytes = 2; accBytes = 1;
            } else { // Four or more are not supported for CESU-8.
                res += this.defaultCharUnicode;
            }
        } else { // Continuation byte
            if (contBytes > 0) { // We're waiting for it.
                acc = (acc << 6) | (curByte & 0x3f);
                contBytes--; accBytes++;
                if (contBytes === 0) {
                    // Check for overlong encoding, but support Modified UTF-8 (encoding NULL as C0 80)
                    if (accBytes === 2 && acc < 0x80 && acc > 0)
                        res += this.defaultCharUnicode;
                    else if (accBytes === 3 && acc < 0x800)
                        res += this.defaultCharUnicode;
                    else
                        // Actually add character.
                        res += String.fromCharCode(acc);
                }
            } else { // Unexpected continuation byte
                res += this.defaultCharUnicode;
            }
        }
    }
    this.acc = acc; this.contBytes = contBytes; this.accBytes = accBytes;
    return res;
}

InternalDecoderCesu8.prototype.end = function() {
    var res = 0;
    if (this.contBytes > 0)
        res += this.defaultCharUnicode;
    return res;
}

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