Base64算法各种版本整理(一)

发布:kinglong | 发布时间: 2007年3月19日

[JavaScript版本]

注意：含有中文字符需要先用Base64.utf16to8方法处理！

[Java版本]

package com.klstudio.util; import java.io.*; public class Base64 { private static char[]base64EncodeChars = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' }; private static byte[]base64DecodeChars = new byte[] { - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, 62, - 1, - 1, - 1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, - 1, - 1, - 1, - 1, - 1, - 1, - 1, 0, 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, - 1, - 1, - 1, - 1, - 1, - 1, 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, - 1, - 1, - 1, - 1, - 1 }; private Base64(){} public static String encode(byte[]data) { StringBuffer sb = new StringBuffer(); int len = data.length; int i = 0; int b1, b2, b3; while (i < len) { b1 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[(b1 & 0x3) << 4]); sb.append("=="); break; } b2 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[(b2 & 0x0f) << 2]); sb.append("="); break; } b3 = data[i++] & 0xff; sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4) ]); sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6) ]); sb.append(base64EncodeChars[b3 & 0x3f]); } return sb.toString(); } public static byte[]decode(String str) { byte[]data = str.getBytes(); int len = data.length; ByteArrayOutputStream buf = new ByteArrayOutputStream(len); int i = 0; int b1, b2, b3, b4; while (i < len) { /* b1 */ do { b1 = base64DecodeChars[data[i++]]; } while (i < len && b1 == - 1); if (b1 == - 1) { break; } /* b2 */ do { b2 = base64DecodeChars[data[i++]]; } while (i < len && b2 == - 1); if (b2 == - 1) { break; } buf.write((int)((b1 << 2) | ((b2 & 0x30) >>> 4))); /* b3 */ do { b3 = data[i++]; if (b3 == 61) { return buf.toByteArray(); } b3 = base64DecodeChars[b3]; } while (i < len && b3 == - 1); if (b3 == - 1) { break; } buf.write((int)(((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2))); /* b4 */ do { b4 = data[i++]; if (b4 == 61) { return buf.toByteArray(); } b4 = base64DecodeChars[b4]; } while (i < len && b4 == - 1); if (b4 == - 1) { break; } buf.write((int)(((b3 & 0x03) << 6) | b4)); } return buf.toByteArray(); } }

[ActionScript 3 版本]

/* Base64 - 1.1.0 Copyright (c) 2006 Steve Webster Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package com.dynamicflash.util { 	import flash.utils.ByteArray; 	 	public class Base64 { 		 		private static const BASE64_CHARS:String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; 		public static const version:String = "1.0.0"; 		public static function encode(data:String):String { 			// Convert string to ByteArray 			var bytes:ByteArray = new ByteArray(); 			bytes.writeUTFBytes(data); 			 			// Return encoded ByteArray 			return encodeByteArray(bytes); 		} 		 		public static function encodeByteArray(data:ByteArray):String { 			// Initialise output 			var output:String = ""; 			 			// Create data and output buffers 			var dataBuffer:Array; 			var outputBuffer:Array = new Array(4); 			 			// Rewind ByteArray 			data.position = 0; 			 			// while there are still bytes to be processed 			while (data.bytesAvailable > 0) { 				// Create new data buffer and populate next 3 bytes from data 				dataBuffer = new Array(); 				for (var i:uint = 0; i < 3 && data.bytesAvailable > 0; i++) { 					dataBuffer[i] = data.readUnsignedByte(); 				} 				 				// Convert to data buffer Base64 character positions and 				// store in output buffer 				outputBuffer[0] = (dataBuffer[0] & 0xfc) >> 2; 				outputBuffer[1] = ((dataBuffer[0] & 0x03) << 4) | ((dataBuffer[1]) >> 4); 				outputBuffer[2] = ((dataBuffer[1] & 0x0f) << 2) | ((dataBuffer[2]) >> 6); 				outputBuffer[3] = dataBuffer[2] & 0x3f; 				 				// If data buffer was short (i.e not 3 characters) then set 				// end character indexes in data buffer to index of '=' symbol. 				// This is necessary because Base64 data is always a multiple of 				// 4 bytes and is basses with '=' symbols. 				for (var j:uint = dataBuffer.length; j < 3; j++) { 					outputBuffer[j + 1] = 64; 				} 				 				// Loop through output buffer and add Base64 characters to 				// encoded data string for each character. 				for (var k:uint = 0; k < outputBuffer.length; k++) { 					output += BASE64_CHARS.charAt(outputBuffer[k]); 				} 			} 			 			// Return encoded data 			return output; 		} 		 		public static function decode(data:String):String { 			// Decode data to ByteArray 			var bytes:ByteArray = decodeToByteArray(data); 			 			// Convert to string and return 			return bytes.readUTFBytes(bytes.length); 		} 		 		public static function decodeToByteArray(data:String):ByteArray { 			// Initialise output ByteArray for decoded data 			var output:ByteArray = new ByteArray(); 			 			// Create data and output buffers 			var dataBuffer:Array = new Array(4); 			var outputBuffer:Array = new Array(3); 			// While there are data bytes left to be processed 			for (var i:uint = 0; i < data.length; i += 4) { 				// Populate data buffer with position of Base64 characters for 				// next 4 bytes from encoded data 				for (var j:uint = 0; j < 4 && i + j < data.length; j++) { 					dataBuffer[j] = BASE64_CHARS.indexOf(data.charAt(i + j)); 				} 			 			// Decode data buffer back into bytes 				outputBuffer[0] = (dataBuffer[0] << 2) + ((dataBuffer[1] & 0x30) >> 4); 				outputBuffer[1] = ((dataBuffer[1] & 0x0f) << 4) + ((dataBuffer[2] & 0x3c) >> 2);		 				outputBuffer[2] = ((dataBuffer[2] & 0x03) << 6) + dataBuffer[3]; 				 				// Add all non-padded bytes in output buffer to decoded data 				for (var k:uint = 0; k < outputBuffer.length; k++) { 					if (dataBuffer[k+1] == 64) break; 					output.writeByte(outputBuffer[k]); 				} 			} 			 			// Rewind decoded data ByteArray 			output.position = 0; 			 			// Return decoded data 			return output; 		} 		 		public function Base64() { 			throw new Error("Base64 class is static container only"); 		} 	} }

标签:

flash as3 javascript Java 整理

发布:kinglong | 分类:Flash技术 | 评论:5 | 引用:0 | 浏览: | TrackBack引用地址

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1.bestrj.com
http://www.bestrj.com/
都是些算法的东西哦!!
2007-3-26 0:55:23 回复该留言

2.qiter
kl老大。能举5个例子说明下。。。。具体用途，最多用在什么地方吗？
2007-5-30 23:46:51 回复该留言

3.kinglong
http://www.klstudio.com
至于Base64有什么用途，其实网上有很多资料的，它一般是用作把字节数据(也就是二进制数据)，转换成普通的字符数据(按照Base64规则编码)；反之也可以了!
2007-5-31 10:45:03 回复该留言

4.SoleilNeon
http://blog.soleilneon.com
好东西，收藏了先，慢慢研究。
2007-12-6 20:07:51 回复该留言

5.py向前
以为发现base64的新东西了...

楼主...貌似你说的不是base64算法的各种版本
是base64算法在各种程序语言下的实现....
2009-11-27 22:21:29 回复该留言

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