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121
node_modules/iconv-lite/lib/streams.js
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node_modules/iconv-lite/lib/streams.js
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"use strict";
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var Buffer = require("buffer").Buffer,
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Transform = require("stream").Transform;
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// == Exports ==================================================================
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module.exports = function(iconv) {
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// Additional Public API.
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iconv.encodeStream = function encodeStream(encoding, options) {
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return new IconvLiteEncoderStream(iconv.getEncoder(encoding, options), options);
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}
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iconv.decodeStream = function decodeStream(encoding, options) {
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return new IconvLiteDecoderStream(iconv.getDecoder(encoding, options), options);
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}
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iconv.supportsStreams = true;
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// Not published yet.
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iconv.IconvLiteEncoderStream = IconvLiteEncoderStream;
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iconv.IconvLiteDecoderStream = IconvLiteDecoderStream;
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iconv._collect = IconvLiteDecoderStream.prototype.collect;
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};
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// == Encoder stream =======================================================
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function IconvLiteEncoderStream(conv, options) {
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this.conv = conv;
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options = options || {};
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options.decodeStrings = false; // We accept only strings, so we don't need to decode them.
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Transform.call(this, options);
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}
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IconvLiteEncoderStream.prototype = Object.create(Transform.prototype, {
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constructor: { value: IconvLiteEncoderStream }
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});
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IconvLiteEncoderStream.prototype._transform = function(chunk, encoding, done) {
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if (typeof chunk != 'string')
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return done(new Error("Iconv encoding stream needs strings as its input."));
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try {
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var res = this.conv.write(chunk);
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if (res && res.length) this.push(res);
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done();
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}
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catch (e) {
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done(e);
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}
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}
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IconvLiteEncoderStream.prototype._flush = function(done) {
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try {
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var res = this.conv.end();
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if (res && res.length) this.push(res);
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done();
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}
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catch (e) {
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done(e);
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}
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}
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IconvLiteEncoderStream.prototype.collect = function(cb) {
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var chunks = [];
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this.on('error', cb);
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this.on('data', function(chunk) { chunks.push(chunk); });
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this.on('end', function() {
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cb(null, Buffer.concat(chunks));
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});
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return this;
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}
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// == Decoder stream =======================================================
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function IconvLiteDecoderStream(conv, options) {
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this.conv = conv;
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options = options || {};
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options.encoding = this.encoding = 'utf8'; // We output strings.
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Transform.call(this, options);
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}
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IconvLiteDecoderStream.prototype = Object.create(Transform.prototype, {
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constructor: { value: IconvLiteDecoderStream }
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});
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IconvLiteDecoderStream.prototype._transform = function(chunk, encoding, done) {
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if (!Buffer.isBuffer(chunk))
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return done(new Error("Iconv decoding stream needs buffers as its input."));
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try {
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var res = this.conv.write(chunk);
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if (res && res.length) this.push(res, this.encoding);
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done();
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}
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catch (e) {
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done(e);
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}
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}
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IconvLiteDecoderStream.prototype._flush = function(done) {
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try {
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var res = this.conv.end();
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if (res && res.length) this.push(res, this.encoding);
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done();
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}
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catch (e) {
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done(e);
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}
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}
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IconvLiteDecoderStream.prototype.collect = function(cb) {
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var res = '';
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this.on('error', cb);
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this.on('data', function(chunk) { res += chunk; });
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this.on('end', function() {
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cb(null, res);
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});
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return this;
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}
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