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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | 24x 24x 24x 24x 24x 24x 140x 54x 86x 86x 86x 86x 43x 43x 24x 24x 891x 891x 891x 24x 290x 290x 850x 849x 849x 849x 1186x 1073x 662x 662x 662x 662x 411x 411x 23x 23x 23x 23x 23x 388x 388x 7x 381x 381x 1073x 1064x 1186x 903x 4x 4x 4x 4x 283x 283x 290x 290x 290x 24x 1170x 969x 784x 784x 784x 185x 185x 185x 185x 575x 575x 185x 185x 185x 2x 2x 185x 185x 185x 182x 184x 184x 24x 24x | var Stream = require('stream');
var Promise = require('bluebird');
var util = require('util');
var Buffer = require('./Buffer');
var strFunction = 'function';
// Backwards compatibility for node versions < 8
Iif (!Stream.Writable || !Stream.Writable.prototype.destroy)
Stream = require('readable-stream');
function PullStream() {
if (!(this instanceof PullStream))
return new PullStream();
Stream.Duplex.call(this,{decodeStrings:false, objectMode:true});
this.buffer = Buffer.from('');
var self = this;
self.on('finish',function() {
self.finished = true;
self.emit('chunk',false);
});
}
util.inherits(PullStream,Stream.Duplex);
PullStream.prototype._write = function(chunk,e,cb) {
this.buffer = Buffer.concat([this.buffer,chunk]);
this.cb = cb;
this.emit('chunk');
};
// The `eof` parameter is interpreted as `file_length` if the type is number
// otherwise (i.e. buffer) it is interpreted as a pattern signaling end of stream
PullStream.prototype.stream = function(eof,includeEof) {
var p = Stream.PassThrough();
var done,self= this;
function cb() {
if (typeof self.cb === strFunction) {
var callback = self.cb;
self.cb = undefined;
return callback();
}
}
function pull() {
var packet;
if (self.buffer && self.buffer.length) {
if (typeof eof === 'number') {
packet = self.buffer.slice(0,eof);
self.buffer = self.buffer.slice(eof);
eof -= packet.length;
done = !eof;
} else {
var match = self.buffer.indexOf(eof);
if (match !== -1) {
// store signature match byte offset to allow us to reference
// this for zip64 offset
self.match = match
Iif (includeEof) match = match + eof.length;
packet = self.buffer.slice(0,match);
self.buffer = self.buffer.slice(match);
done = true;
} else {
var len = self.buffer.length - eof.length;
if (len <= 0) {
cb();
} else {
packet = self.buffer.slice(0,len);
self.buffer = self.buffer.slice(len);
}
}
}
if (packet) p.write(packet,function() {
if (self.buffer.length === 0 || (eof.length && self.buffer.length <= eof.length)) cb();
});
}
if (!done) {
if (self.finished && !this.__ended) {
self.removeListener('chunk',pull);
self.emit('error', new Error('FILE_ENDED'));
this.__ended = true;
return;
}
} else {
self.removeListener('chunk',pull);
p.end();
}
}
self.on('chunk',pull);
pull();
return p;
};
PullStream.prototype.pull = function(eof,includeEof) {
if (eof === 0) return Promise.resolve('');
// If we already have the required data in buffer
// we can resolve the request immediately
if (!isNaN(eof) && this.buffer.length > eof) {
var data = this.buffer.slice(0,eof);
this.buffer = this.buffer.slice(eof);
return Promise.resolve(data);
}
// Otherwise we stream until we have it
var buffer = Buffer.from(''),
self = this;
var concatStream = Stream.Transform();
concatStream._transform = function(d,e,cb) {
buffer = Buffer.concat([buffer,d]);
cb();
};
var rejectHandler;
var pullStreamRejectHandler;
return new Promise(function(resolve,reject) {
rejectHandler = reject;
pullStreamRejectHandler = function(e) {
self.__emittedError = e;
reject(e);
}
Iif (self.finished)
return reject(new Error('FILE_ENDED'));
self.once('error',pullStreamRejectHandler); // reject any errors from pullstream itself
self.stream(eof,includeEof)
.on('error',reject)
.pipe(concatStream)
.on('finish',function() {resolve(buffer);})
.on('error',reject);
})
.finally(function() {
self.removeListener('error',rejectHandler);
self.removeListener('error',pullStreamRejectHandler);
});
};
PullStream.prototype._read = function(){};
module.exports = PullStream;
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