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- "use strict";
- var Buffer = require("safer-buffer").Buffer;
-
-
-
-
-
- exports.utf16be = Utf16BECodec;
- function Utf16BECodec() {
- }
-
- Utf16BECodec.prototype.encoder = Utf16BEEncoder;
- Utf16BECodec.prototype.decoder = Utf16BEDecoder;
- Utf16BECodec.prototype.bomAware = true;
-
-
-
-
- function Utf16BEEncoder() {
- }
-
- Utf16BEEncoder.prototype.write = function(str) {
- var buf = Buffer.from(str, 'ucs2');
- for (var i = 0; i < buf.length; i += 2) {
- var tmp = buf[i]; buf[i] = buf[i+1]; buf[i+1] = tmp;
- }
- return buf;
- }
-
- Utf16BEEncoder.prototype.end = function() {
- }
-
-
-
-
- function Utf16BEDecoder() {
- this.overflowByte = -1;
- }
-
- Utf16BEDecoder.prototype.write = function(buf) {
- if (buf.length == 0)
- return '';
-
- var buf2 = Buffer.alloc(buf.length + 1),
- i = 0, j = 0;
-
- if (this.overflowByte !== -1) {
- buf2[0] = buf[0];
- buf2[1] = this.overflowByte;
- i = 1; j = 2;
- }
-
- for (; i < buf.length-1; i += 2, j+= 2) {
- buf2[j] = buf[i+1];
- buf2[j+1] = buf[i];
- }
-
- this.overflowByte = (i == buf.length-1) ? buf[buf.length-1] : -1;
-
- return buf2.slice(0, j).toString('ucs2');
- }
-
- Utf16BEDecoder.prototype.end = function() {
- }
-
-
-
-
-
-
-
-
-
-
- exports.utf16 = Utf16Codec;
- function Utf16Codec(codecOptions, iconv) {
- this.iconv = iconv;
- }
-
- Utf16Codec.prototype.encoder = Utf16Encoder;
- Utf16Codec.prototype.decoder = Utf16Decoder;
-
-
-
-
- function Utf16Encoder(options, codec) {
- options = options || {};
- if (options.addBOM === undefined)
- options.addBOM = true;
- this.encoder = codec.iconv.getEncoder('utf-16le', options);
- }
-
- Utf16Encoder.prototype.write = function(str) {
- return this.encoder.write(str);
- }
-
- Utf16Encoder.prototype.end = function() {
- return this.encoder.end();
- }
-
-
-
-
- function Utf16Decoder(options, codec) {
- this.decoder = null;
- this.initialBytes = [];
- this.initialBytesLen = 0;
-
- this.options = options || {};
- this.iconv = codec.iconv;
- }
-
- Utf16Decoder.prototype.write = function(buf) {
- if (!this.decoder) {
-
- this.initialBytes.push(buf);
- this.initialBytesLen += buf.length;
-
- if (this.initialBytesLen < 16)
- return '';
-
-
- var buf = Buffer.concat(this.initialBytes),
- encoding = detectEncoding(buf, this.options.defaultEncoding);
- this.decoder = this.iconv.getDecoder(encoding, this.options);
- this.initialBytes.length = this.initialBytesLen = 0;
- }
-
- return this.decoder.write(buf);
- }
-
- Utf16Decoder.prototype.end = function() {
- if (!this.decoder) {
- var buf = Buffer.concat(this.initialBytes),
- encoding = detectEncoding(buf, this.options.defaultEncoding);
- this.decoder = this.iconv.getDecoder(encoding, this.options);
-
- var res = this.decoder.write(buf),
- trail = this.decoder.end();
-
- return trail ? (res + trail) : res;
- }
- return this.decoder.end();
- }
-
- function detectEncoding(buf, defaultEncoding) {
- var enc = defaultEncoding || 'utf-16le';
-
- if (buf.length >= 2) {
-
- if (buf[0] == 0xFE && buf[1] == 0xFF)
- enc = 'utf-16be';
- else if (buf[0] == 0xFF && buf[1] == 0xFE)
- enc = 'utf-16le';
- else {
-
-
-
- var asciiCharsLE = 0, asciiCharsBE = 0,
- _len = Math.min(buf.length - (buf.length % 2), 64);
-
- for (var i = 0; i < _len; i += 2) {
- if (buf[i] === 0 && buf[i+1] !== 0) asciiCharsBE++;
- if (buf[i] !== 0 && buf[i+1] === 0) asciiCharsLE++;
- }
-
- if (asciiCharsBE > asciiCharsLE)
- enc = 'utf-16be';
- else if (asciiCharsBE < asciiCharsLE)
- enc = 'utf-16le';
- }
- }
-
- return enc;
- }
-
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