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Edit File : streams.js \| Size : 3.31 KB
"use strict"; var Buffer = require("buffer").Buffer, Transform = require("stream").Transform; // == Exports ================================================================== module.exports = function(iconv) { // Additional Public API. iconv.encodeStream = function encodeStream(encoding, options) { return new IconvLiteEncoderStream(iconv.getEncoder(encoding, options), options); } iconv.decodeStream = function decodeStream(encoding, options) { return new IconvLiteDecoderStream(iconv.getDecoder(encoding, options), options); } iconv.supportsStreams = true; // Not published yet. iconv.IconvLiteEncoderStream = IconvLiteEncoderStream; iconv.IconvLiteDecoderStream = IconvLiteDecoderStream; iconv._collect = IconvLiteDecoderStream.prototype.collect; }; // == Encoder stream ======================================================= function IconvLiteEncoderStream(conv, options) { this.conv = conv; options = options \|\| {}; options.decodeStrings = false; // We accept only strings, so we don't need to decode them. Transform.call(this, options); } IconvLiteEncoderStream.prototype = Object.create(Transform.prototype, { constructor: { value: IconvLiteEncoderStream } }); IconvLiteEncoderStream.prototype._transform = function(chunk, encoding, done) { if (typeof chunk != 'string') return done(new Error("Iconv encoding stream needs strings as its input.")); try { var res = this.conv.write(chunk); if (res && res.length) this.push(res); done(); } catch (e) { done(e); } } IconvLiteEncoderStream.prototype._flush = function(done) { try { var res = this.conv.end(); if (res && res.length) this.push(res); done(); } catch (e) { done(e); } } IconvLiteEncoderStream.prototype.collect = function(cb) { var chunks = []; this.on('error', cb); this.on('data', function(chunk) { chunks.push(chunk); }); this.on('end', function() { cb(null, Buffer.concat(chunks)); }); return this; } // == Decoder stream ======================================================= function IconvLiteDecoderStream(conv, options) { this.conv = conv; options = options \|\| {}; options.encoding = this.encoding = 'utf8'; // We output strings. Transform.call(this, options); } IconvLiteDecoderStream.prototype = Object.create(Transform.prototype, { constructor: { value: IconvLiteDecoderStream } }); IconvLiteDecoderStream.prototype._transform = function(chunk, encoding, done) { if (!Buffer.isBuffer(chunk)) return done(new Error("Iconv decoding stream needs buffers as its input.")); try { var res = this.conv.write(chunk); if (res && res.length) this.push(res, this.encoding); done(); } catch (e) { done(e); } } IconvLiteDecoderStream.prototype._flush = function(done) { try { var res = this.conv.end(); if (res && res.length) this.push(res, this.encoding); done(); } catch (e) { done(e); } } IconvLiteDecoderStream.prototype.collect = function(cb) { var res = ''; this.on('error', cb); this.on('data', function(chunk) { res += chunk; }); this.on('end', function() { cb(null, res); }); return this; } Back

Edit File : streams.js | Size : 3.31 KB

"use strict";

var Buffer = require("buffer").Buffer,
    Transform = require("stream").Transform;

// == Exports ==================================================================
module.exports = function(iconv) {
    
    // Additional Public API.
    iconv.encodeStream = function encodeStream(encoding, options) {
        return new IconvLiteEncoderStream(iconv.getEncoder(encoding, options), options);
    }

iconv.decodeStream = function decodeStream(encoding, options) {
        return new IconvLiteDecoderStream(iconv.getDecoder(encoding, options), options);
    }

iconv.supportsStreams = true;

// Not published yet.
    iconv.IconvLiteEncoderStream = IconvLiteEncoderStream;
    iconv.IconvLiteDecoderStream = IconvLiteDecoderStream;
    iconv._collect = IconvLiteDecoderStream.prototype.collect;
};

// == Encoder stream =======================================================
function IconvLiteEncoderStream(conv, options) {
    this.conv = conv;
    options = options || {};
    options.decodeStrings = false; // We accept only strings, so we don't need to decode them.
    Transform.call(this, options);
}

IconvLiteEncoderStream.prototype = Object.create(Transform.prototype, {
    constructor: { value: IconvLiteEncoderStream }
});

IconvLiteEncoderStream.prototype._transform = function(chunk, encoding, done) {
    if (typeof chunk != 'string')
        return done(new Error("Iconv encoding stream needs strings as its input."));
    try {
        var res = this.conv.write(chunk);
        if (res && res.length) this.push(res);
        done();
    }
    catch (e) {
        done(e);
    }
}

IconvLiteEncoderStream.prototype._flush = function(done) {
    try {
        var res = this.conv.end();
        if (res && res.length) this.push(res);
        done();
    }
    catch (e) {
        done(e);
    }
}

IconvLiteEncoderStream.prototype.collect = function(cb) {
    var chunks = [];
    this.on('error', cb);
    this.on('data', function(chunk) { chunks.push(chunk); });
    this.on('end', function() {
        cb(null, Buffer.concat(chunks));
    });
    return this;
}

// == Decoder stream =======================================================
function IconvLiteDecoderStream(conv, options) {
    this.conv = conv;
    options = options || {};
    options.encoding = this.encoding = 'utf8'; // We output strings.
    Transform.call(this, options);
}

IconvLiteDecoderStream.prototype = Object.create(Transform.prototype, {
    constructor: { value: IconvLiteDecoderStream }
});

IconvLiteDecoderStream.prototype._transform = function(chunk, encoding, done) {
    if (!Buffer.isBuffer(chunk))
        return done(new Error("Iconv decoding stream needs buffers as its input."));
    try {
        var res = this.conv.write(chunk);
        if (res && res.length) this.push(res, this.encoding);
        done();
    }
    catch (e) {
        done(e);
    }
}

IconvLiteDecoderStream.prototype._flush = function(done) {
    try {
        var res = this.conv.end();
        if (res && res.length) this.push(res, this.encoding);                
        done();
    }
    catch (e) {
        done(e);
    }
}

IconvLiteDecoderStream.prototype.collect = function(cb) {
    var res = '';
    this.on('error', cb);
    this.on('data', function(chunk) { res += chunk; });
    this.on('end', function() {
        cb(null, res);
    });
    return this;
}

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