Éric Lemoine
120 lines
3.5 KiB
JavaScript
120 lines
3.5 KiB
JavaScript
// Copyright 2008 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Namespace with crypto related helper functions.
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*/
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goog.provide('goog.crypt');
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goog.require('goog.array');
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/**
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* Turns a string into an array of bytes; a "byte" being a JS number in the
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* range 0-255.
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* @param {string} str String value to arrify.
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* @return {Array.<number>} Array of numbers corresponding to the
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* UCS character codes of each character in str.
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*/
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goog.crypt.stringToByteArray = function(str) {
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var output = [], p = 0;
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for (var i = 0; i < str.length; i++) {
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var c = str.charCodeAt(i);
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while (c > 0xff) {
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output[p++] = c & 0xff;
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c >>= 8;
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}
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output[p++] = c;
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}
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return output;
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};
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/**
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* Turns an array of numbers into the string given by the concatenation of the
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* characters to which the numbers correspond.
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* @param {Array} array Array of numbers representing characters.
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* @return {string} Stringification of the array.
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*/
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goog.crypt.byteArrayToString = function(array) {
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return String.fromCharCode.apply(null, array);
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};
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/**
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* Turns an array of numbers into the hex string given by the concatenation of
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* the hex values to which the numbers correspond.
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* @param {Array} array Array of numbers representing characters.
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* @return {string} Hex string.
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*/
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goog.crypt.byteArrayToHex = function(array) {
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return goog.array.map(array, function(numByte) {
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var hexByte = numByte.toString(16);
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return hexByte.length > 1 ? hexByte : '0' + hexByte;
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}).join('');
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};
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/**
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* Converts a JS string to a UTF-8 "byte" array.
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* @param {string} str 16-bit unicode string.
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* @return {Array.<number>} UTF-8 byte array.
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*/
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goog.crypt.stringToUtf8ByteArray = function(str) {
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// TODO(user): Use native implementations if/when available
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str = str.replace(/\r\n/g, '\n');
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var out = [], p = 0;
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for (var i = 0; i < str.length; i++) {
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var c = str.charCodeAt(i);
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if (c < 128) {
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out[p++] = c;
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} else if (c < 2048) {
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out[p++] = (c >> 6) | 192;
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out[p++] = (c & 63) | 128;
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} else {
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out[p++] = (c >> 12) | 224;
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out[p++] = ((c >> 6) & 63) | 128;
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out[p++] = (c & 63) | 128;
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}
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}
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return out;
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};
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/**
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* Converts a UTF-8 byte array to JavaScript's 16-bit Unicode.
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* @param {Array.<number>} bytes UTF-8 byte array.
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* @return {string} 16-bit Unicode string.
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*/
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goog.crypt.utf8ByteArrayToString = function(bytes) {
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// TODO(user): Use native implementations if/when available
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var out = [], pos = 0, c = 0;
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while (pos < bytes.length) {
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var c1 = bytes[pos++];
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if (c1 < 128) {
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out[c++] = String.fromCharCode(c1);
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} else if (c1 > 191 && c1 < 224) {
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var c2 = bytes[pos++];
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out[c++] = String.fromCharCode((c1 & 31) << 6 | c2 & 63);
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} else {
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var c2 = bytes[pos++];
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var c3 = bytes[pos++];
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out[c++] = String.fromCharCode(
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(c1 & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
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}
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}
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return out.join('');
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};
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