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Viewing file:     index.js (3.11 KB)      -rw-r--r--

/* Copyright 2010 Membase, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

/*jshint node:true*/


/**
 * Convert a 16-bit quantity (short integer) from host byte order to network byte order (Little-Endian to Big-Endian).
 *
 * @param {Array|Buffer} b Array of octets or a nodejs Buffer
 * @param {number} i Zero-based index at which to write into b
 * @param {number} v Value to convert
 */
exports.htons = function(b, i, v) {
	b[i] = (0xff & (v >> 8));
	b[i + 1] = (0xff & (v));
};


/**
 * Convert a 16-bit quantity (short integer) from network byte order to host byte order (Big-Endian to Little-Endian).
 *
 * @param {Array|Buffer} b Array of octets or a nodejs Buffer to read value from
 * @param {number} i Zero-based index at which to read from b
 * @returns {number}
 */
exports.ntohs = function(b, i) {
	return ((0xff & b[i]) << 8) | 
	       ((0xff & b[i + 1]));
};


/**
 * Convert a 16-bit quantity (short integer) from network byte order to host byte order (Big-Endian to Little-Endian).
 *
 * @param {string} s String to read value from
 * @param {number} i Zero-based index at which to read from s
 * @returns {number}
 */
exports.ntohsStr = function(s, i) {
	return ((0xff & s.charCodeAt(i)) << 8) |
	       ((0xff & s.charCodeAt(i + 1)));
};


/**
 * Convert a 32-bit quantity (long integer) from host byte order to network byte order (Little-Endian to Big-Endian).
 *
 * @param {Array|Buffer} b Array of octets or a nodejs Buffer
 * @param {number} i Zero-based index at which to write into b
 * @param {number} v Value to convert
 */
exports.htonl = function(b, i, v) {
	b[i] = (0xff & (v >> 24));
	b[i + 1] = (0xff & (v >> 16));
	b[i + 2] = (0xff & (v >> 8));
	b[i + 3] = (0xff & (v));
};


/**
 * Convert a 32-bit quantity (long integer) from network byte order to host byte order (Big-Endian to Little-Endian).
 *
 * @param {Array|Buffer} b Array of octets or a nodejs Buffer to read value from
 * @param {number} i Zero-based index at which to read from b
 * @returns {number}
 */
exports.ntohl = function(b, i) {
	return ((0xff & b[i]) << 24) |
	       ((0xff & b[i + 1]) << 16) |
	       ((0xff & b[i + 2]) << 8) |
	       ((0xff & b[i + 3]));
};


/**
 * Convert a 32-bit quantity (long integer) from network byte order to host byte order (Big-Endian to Little-Endian).
 *
 * @param {string} s String to read value from
 * @param {number} i Zero-based index at which to read from s
 * @returns {number}
 */
exports.ntohlStr = function(s, i) {
	return ((0xff & s.charCodeAt(i)) << 24) |
	       ((0xff & s.charCodeAt(i + 1)) << 16) |
	       ((0xff & s.charCodeAt(i + 2)) << 8) |
	       ((0xff & s.charCodeAt(i + 3)));
};