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Update parser.js #9

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74 changes: 47 additions & 27 deletions src/responses/parser.js
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Original file line number Diff line number Diff line change
Expand Up @@ -23,45 +23,65 @@ class Parser extends EventEmitter {
super();
this.buffer = null;
}


parseLoop(buffer) {
while(true) {
const ber = new BerReader(buffer);

try {
ber.readSequence();
} catch (e) {
this.emit('error', e);
return buffer;
}

if (ber.remain < ber.length || ber.length === 0) {
return buffer;
}

let nextMessages = null;
if (ber.remain > ber.length) {
nextMessages = buffer.slice(ber.offset + ber.length);
ber._size = ber.offset + ber.length;
assert.equal(ber.remain, ber.length);
}

try {
const message = getMessage(ber);
message.parse(ber);
this.emit('message', message);
} catch (e) {
this.emit('error', e);
}

if (nextMessages === null) {
return null;
} else {
buffer = nextMessages;
}
}
}

parse(data) {
assert.buffer(data, 'data');

this.buffer = this.buffer ? Buffer.concat([this.buffer, data]) : data;

const ber = new BerReader(this.buffer);

try {
ber.readSequence();
} catch (e) {
this.emit('error', e);
return;
}

if (ber.remain < ber.length) {

// If the chunk is not full, we continue accumulating the buffer.
if (ber.remain < ber.length || ber.length === 0) {
return;
}

let nextMessage = null;
if (ber.remain > ber.length) {
nextMessage = this.buffer.slice(ber.offset + ber.length);
ber._size = ber.offset + ber.length;
assert.equal(ber.remain, ber.length);
}

this.buffer = null;

try {
const message = getMessage(ber);
message.parse(ber);
this.emit('message', message);
} catch (e) {
this.emit('error', e);
}

if (nextMessage) {
this.parse(nextMessage);
}

this.buffer = this.parseLoop(this.buffer);
}
}

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