dynatrace-cordova-outsystems-plugin/node_modules/sshpk/lib/ssh-buffer.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

// Copyright 2015 Joyent, Inc.

module.exports = SSHBuffer;

var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;

function SSHBuffer(opts) {
	assert.object(opts, 'options');
	if (opts.buffer !== undefined)
		assert.buffer(opts.buffer, 'options.buffer');

	this._size = opts.buffer ? opts.buffer.length : 1024;
	this._buffer = opts.buffer || Buffer.alloc(this._size);
	this._offset = 0;
}

SSHBuffer.prototype.toBuffer = function () {
	return (this._buffer.slice(0, this._offset));
};

SSHBuffer.prototype.atEnd = function () {
	return (this._offset >= this._buffer.length);
};

SSHBuffer.prototype.remainder = function () {
	return (this._buffer.slice(this._offset));
};

SSHBuffer.prototype.skip = function (n) {
	this._offset += n;
};

SSHBuffer.prototype.expand = function () {
	this._size *= 2;
	var buf = Buffer.alloc(this._size);
	this._buffer.copy(buf, 0);
	this._buffer = buf;
};

SSHBuffer.prototype.readPart = function () {
	return ({data: this.readBuffer()});
};

SSHBuffer.prototype.readBuffer = function () {
	var len = this._buffer.readUInt32BE(this._offset);
	this._offset += 4;
	assert.ok(this._offset + len <= this._buffer.length,
	    'length out of bounds at +0x' + this._offset.toString(16) +
	    ' (data truncated?)');
	var buf = this._buffer.slice(this._offset, this._offset + len);
	this._offset += len;
	return (buf);
};

SSHBuffer.prototype.readString = function () {
	return (this.readBuffer().toString());
};

SSHBuffer.prototype.readCString = function () {
	var offset = this._offset;
	while (offset < this._buffer.length &&
	    this._buffer[offset] !== 0x00)
		offset++;
	assert.ok(offset < this._buffer.length, 'c string does not terminate');
	var str = this._buffer.slice(this._offset, offset).toString();
	this._offset = offset + 1;
	return (str);
};

SSHBuffer.prototype.readInt = function () {
	var v = this._buffer.readUInt32BE(this._offset);
	this._offset += 4;
	return (v);
};

SSHBuffer.prototype.readInt64 = function () {
	assert.ok(this._offset + 8 < this._buffer.length,
	    'buffer not long enough to read Int64');
	var v = this._buffer.slice(this._offset, this._offset + 8);
	this._offset += 8;
	return (v);
};

SSHBuffer.prototype.readChar = function () {
	var v = this._buffer[this._offset++];
	return (v);
};

SSHBuffer.prototype.writeBuffer = function (buf) {
	while (this._offset + 4 + buf.length > this._size)
		this.expand();
	this._buffer.writeUInt32BE(buf.length, this._offset);
	this._offset += 4;
	buf.copy(this._buffer, this._offset);
	this._offset += buf.length;
};

SSHBuffer.prototype.writeString = function (str) {
	this.writeBuffer(Buffer.from(str, 'utf8'));
};

SSHBuffer.prototype.writeCString = function (str) {
	while (this._offset + 1 + str.length > this._size)
		this.expand();
	this._buffer.write(str, this._offset);
	this._offset += str.length;
	this._buffer[this._offset++] = 0;
};

SSHBuffer.prototype.writeInt = function (v) {
	while (this._offset + 4 > this._size)
		this.expand();
	this._buffer.writeUInt32BE(v, this._offset);
	this._offset += 4;
};

SSHBuffer.prototype.writeInt64 = function (v) {
	assert.buffer(v, 'value');
	if (v.length > 8) {
		var lead = v.slice(0, v.length - 8);
		for (var i = 0; i < lead.length; ++i) {
			assert.strictEqual(lead[i], 0,
			    'must fit in 64 bits of precision');
		}
		v = v.slice(v.length - 8, v.length);
	}
	while (this._offset + 8 > this._size)
		this.expand();
	v.copy(this._buffer, this._offset);
	this._offset += 8;
};

SSHBuffer.prototype.writeChar = function (v) {
	while (this._offset + 1 > this._size)
		this.expand();
	this._buffer[this._offset++] = v;
};

SSHBuffer.prototype.writePart = function (p) {
	this.writeBuffer(p.data);
};

SSHBuffer.prototype.write = function (buf) {
	while (this._offset + buf.length > this._size)
		this.expand();
	buf.copy(this._buffer, this._offset);
	this._offset += buf.length;
};