dynatrace-cordova-outsystems-plugin/node_modules/iconv-lite/lib/streams.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

"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;
}