--- a/js/flotr/lib/base64.js +++ b/js/flotr/lib/base64.js @@ -1,1 +1,113 @@ - +/* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp> + * Version: 1.0 + * LastModified: Dec 25 1999 + * This library is free. You can redistribute it and/or modify it. + */ + +/* + * Interfaces: + * b64 = base64encode(data); + * data = base64decode(b64); + */ + +(function() { + +var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; +var base64DecodeChars = [ + -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]; + +function base64encode(str) { + var out, i, len; + var c1, c2, c3; + + len = str.length; + i = 0; + out = ""; + while(i < len) { + c1 = str.charCodeAt(i++) & 0xff; + if(i == len) + { + out += base64EncodeChars.charAt(c1 >> 2); + out += base64EncodeChars.charAt((c1 & 0x3) << 4); + out += "=="; + break; + } + c2 = str.charCodeAt(i++); + if(i == len) + { + out += base64EncodeChars.charAt(c1 >> 2); + out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)); + out += base64EncodeChars.charAt((c2 & 0xF) << 2); + out += "="; + break; + } + c3 = str.charCodeAt(i++); + out += base64EncodeChars.charAt(c1 >> 2); + out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)); + out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)); + out += base64EncodeChars.charAt(c3 & 0x3F); + } + return out; +} + +function base64decode(str) { + var c1, c2, c3, c4; + var i, len, out; + + len = str.length; + i = 0; + out = ""; + while(i < len) { + /* c1 */ + do { + c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; + } while(i < len && c1 == -1); + if(c1 == -1) + break; + + /* c2 */ + do { + c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; + } while(i < len && c2 == -1); + if(c2 == -1) + break; + + out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)); + + /* c3 */ + do { + c3 = str.charCodeAt(i++) & 0xff; + if(c3 == 61) + return out; + c3 = base64DecodeChars[c3]; + } while(i < len && c3 == -1); + if(c3 == -1) + break; + + out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2)); + + /* c4 */ + do { + c4 = str.charCodeAt(i++) & 0xff; + if(c4 == 61) + return out; + c4 = base64DecodeChars[c4]; + } while(i < len && c4 == -1); + if(c4 == -1) + break; + out += String.fromCharCode(((c3 & 0x03) << 6) | c4); + } + return out; +} + +if (!window.btoa) window.btoa = base64encode; +if (!window.atob) window.atob = base64decode; + +})();