1 | // This code was written by Tyler Akins and has been placed in the |
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2 | // public domain. It would be nice if you left this header intact. |
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3 | // Base64 code from Tyler Akins -- http://rumkin.com |
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4 | |
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5 | keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; |
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6 | |
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7 | function encode64(input) { |
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8 | var output = ""; |
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9 | var chr1, chr2, chr3; |
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10 | var enc1, enc2, enc3, enc4; |
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11 | var i = 0; |
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12 | |
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13 | do { |
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14 | chr1 = input.charCodeAt(i++); |
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15 | chr2 = input.charCodeAt(i++); |
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16 | chr3 = input.charCodeAt(i++); |
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17 | |
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18 | enc1 = chr1 >> 2; |
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19 | enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); |
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20 | enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); |
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21 | enc4 = chr3 & 63; |
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22 | |
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23 | if (isNaN(chr2)) { |
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24 | enc3 = enc4 = 64; |
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25 | } else if (isNaN(chr3)) { |
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26 | enc4 = 64; |
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27 | } |
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28 | |
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29 | output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + |
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30 | keyStr.charAt(enc3) + keyStr.charAt(enc4); |
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31 | } while (i < input.length); |
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32 | return output; |
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33 | } |
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34 | |
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35 | function decode64(input) { |
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36 | var output = ""; |
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37 | var chr1, chr2, chr3; |
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38 | var enc1, enc2, enc3, enc4; |
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39 | var i = 0; |
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40 | |
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41 | // remove all characters that are not A-Z, a-z, 0-9, +, /, or = |
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42 | input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); |
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43 | |
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44 | do { |
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45 | enc1 = keyStr.indexOf(input.charAt(i++)); |
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46 | enc2 = keyStr.indexOf(input.charAt(i++)); |
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47 | enc3 = keyStr.indexOf(input.charAt(i++)); |
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48 | enc4 = keyStr.indexOf(input.charAt(i++)); |
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49 | |
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50 | chr1 = (enc1 << 2) | (enc2 >> 4); |
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51 | chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); |
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52 | chr3 = ((enc3 & 3) << 6) | enc4; |
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53 | |
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54 | output = output + String.fromCharCode(chr1); |
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55 | |
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56 | if (enc3 != 64) { |
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57 | output = output + String.fromCharCode(chr2); |
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58 | } |
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59 | if (enc4 != 64) { |
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60 | output = output + String.fromCharCode(chr3); |
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61 | } |
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62 | } while (i < input.length); |
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63 | |
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64 | return output; |
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65 | } |
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