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- 作者：xiaoxiao
- 发表时间：2020-12-23 11:00
- 来源：未知
<html><head><title>Base64 and Hex Encoding and Decoding</title><meta name="Description" content="Encodes or decodes data in Base64 or Hex using client side JavaScript."><meta name="Keywords" content="encode, decode, base64, base 64, javascript"><script language=javascript type="text/javascript"><!--var END_OF_INPUT = -1;
var base64Chars = new Array( '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','+','/');
var reverseBase64Chars = new Array();for (var i=0; i < base64Chars.length; i++){ reverseBase64Chars[base64Chars[i]] = i;}
var base64Str;var base64Count;function setBase64Str(str){ base64Str = str; base64Count = 0;}function readBase64(){ if (!base64Str) return END_OF_INPUT; if (base64Count >= base64Str.length) return END_OF_INPUT; var c = base64Str.charCodeAt(base64Count) & 0xff; base64Count++; return c;}function encodeBase64(str){ setBase64Str(str); var result = ''; var inBuffer = new Array(3); var lineCount = 0; var done = false; while (!done && (inBuffer[0] = readBase64()) != END_OF_INPUT){ inBuffer[1] = readBase64(); inBuffer[2] = readBase64(); result += (base64Chars[ inBuffer[0] >> 2 ]); if (inBuffer[1] != END_OF_INPUT){ result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30) | (inBuffer[1] >> 4) ]); if (inBuffer[2] != END_OF_INPUT){ result += (base64Chars [((inBuffer[1] << 2) & 0x3c) | (inBuffer[2] >> 6) ]); result += (base64Chars [inBuffer[2] & 0x3F]); } else { result += (base64Chars [((inBuffer[1] << 2) & 0x3c)]); result += ('='); done = true; } } else { result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30)]); result += ('='); result += ('='); done = true; } lineCount += 4; if (lineCount >= 76){ result += ('/n'); lineCount = 0; } } return result;}function readReverseBase64(){ if (!base64Str) return END_OF_INPUT; while (true){ if (base64Count >= base64Str.length) return END_OF_INPUT; var nextCharacter = base64Str.charAt(base64Count); base64Count++; if (reverseBase64Chars[nextCharacter]){ return reverseBase64Chars[nextCharacter]; } if (nextCharacter == 'A') return 0; } }
