+++ /dev/null
-
-
-// == UTF16-BE codec. ==========================================================
-
-exports.utf16be = function(options) {
- return {
- encoder: utf16beEncoder,
- decoder: utf16beDecoder,
-
- bom: new Buffer([0xFE, 0xFF]),
- };
-};
-
-
-// -- Encoding
-
-function utf16beEncoder(options) {
- return {
- write: utf16beEncoderWrite,
- end: function() {},
- }
-}
-
-function utf16beEncoderWrite(str) {
- var buf = new Buffer(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;
-}
-
-
-// -- Decoding
-
-function utf16beDecoder(options) {
- return {
- write: utf16beDecoderWrite,
- end: function() {},
-
- overflowByte: -1,
- };
-}
-
-function utf16beDecoderWrite(buf) {
- if (buf.length == 0)
- return '';
-
- var buf2 = new Buffer(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');
-}
-
-
-// == UTF-16 codec =============================================================
-// Decoder chooses automatically from UTF-16LE and UTF-16BE using BOM and space-based heuristic.
-// Defaults to UTF-16BE, according to RFC 2781, although it is against some industry practices, see
-// http://en.wikipedia.org/wiki/UTF-16 and http://encoding.spec.whatwg.org/#utf-16le
-// Decoder default can be changed: iconv.decode(buf, 'utf16', {default: 'utf-16le'});
-
-// Encoder prepends BOM and uses UTF-16BE.
-// Endianness can also be changed: iconv.encode(str, 'utf16', {use: 'utf-16le'});
-
-exports.utf16 = function(options) {
- return {
- encoder: utf16Encoder,
- decoder: utf16Decoder,
-
- getCodec: options.iconv.getCodec,
- };
-};
-
-// -- Encoding
-
-function utf16Encoder(options) {
- options = options || {};
- var codec = this.getCodec(options.use || 'utf-16be');
- if (!codec.bom)
- throw new Error("iconv-lite: in UTF-16 encoder, 'use' parameter should be either UTF-16BE or UTF16-LE.");
-
- return {
- write: utf16EncoderWrite,
- end: utf16EncoderEnd,
-
- bom: codec.bom,
- internalEncoder: codec.encoder(options),
- };
-}
-
-function utf16EncoderWrite(str) {
- var buf = this.internalEncoder.write(str);
-
- if (this.bom) {
- buf = Buffer.concat([this.bom, buf]);
- this.bom = null;
- }
-
- return buf;
-}
-
-function utf16EncoderEnd() {
- return this.internalEncoder.end();
-}
-
-
-// -- Decoding
-
-function utf16Decoder(options) {
- return {
- write: utf16DecoderWrite,
- end: utf16DecoderEnd,
-
- internalDecoder: null,
- initialBytes: [],
- initialBytesLen: 0,
-
- options: options || {},
- getCodec: this.getCodec,
- };
-}
-
-function utf16DecoderWrite(buf) {
- if (this.internalDecoder)
- return this.internalDecoder.write(buf);
-
- // Codec is not chosen yet. Accumulate initial bytes.
- this.initialBytes.push(buf);
- this.initialBytesLen += buf.length;
-
- if (this.initialBytesLen < 16) // We need > 2 bytes to use space heuristic (see below)
- return '';
-
- // We have enough bytes -> decide endianness.
- return utf16DecoderDecideEndianness.call(this);
-}
-
-function utf16DecoderEnd() {
- if (this.internalDecoder)
- return this.internalDecoder.end();
-
- var res = utf16DecoderDecideEndianness.call(this);
- var trail;
-
- if (this.internalDecoder)
- trail = this.internalDecoder.end();
-
- return (trail && trail.length > 0) ? (res + trail) : res;
-}
-
-function utf16DecoderDecideEndianness() {
- var buf = Buffer.concat(this.initialBytes);
- this.initialBytes.length = this.initialBytesLen = 0;
-
- if (buf.length < 2)
- return ''; // Not a valid UTF-16 sequence anyway.
-
- // Default encoding.
- var enc = this.options.default || 'utf-16be';
-
- // Check BOM.
- if (buf[0] == 0xFE && buf[1] == 0xFF) { // UTF-16BE BOM
- enc = 'utf-16be'; buf = buf.slice(2);
- }
- else if (buf[0] == 0xFF && buf[1] == 0xFE) { // UTF-16LE BOM
- enc = 'utf-16le'; buf = buf.slice(2);
- }
- else {
- // No BOM found. Try to deduce encoding from initial content.
- // Most of the time, the content has spaces (U+0020), but the opposite (U+2000) is very uncommon.
- // So, we count spaces as if it was LE or BE, and decide from that.
- var spaces = [0, 0], // Counts of space chars in both positions
- _len = Math.min(buf.length - (buf.length % 2), 64); // Len is always even.
-
- for (var i = 0; i < _len; i += 2) {
- if (buf[i] == 0x00 && buf[i+1] == 0x20) spaces[0]++;
- if (buf[i] == 0x20 && buf[i+1] == 0x00) spaces[1]++;
- }
-
- if (spaces[0] > 0 && spaces[1] == 0)
- enc = 'utf-16be';
- else if (spaces[0] == 0 && spaces[1] > 0)
- enc = 'utf-16le';
- }
-
- this.internalDecoder = this.getCodec(enc).decoder(this.options);
- return this.internalDecoder.write(buf);
-}
-
-
Code Review / sdnc / oam.git / blobdiff