c@117: 'use strict'
c@117: 
c@117: if (typeof document === "undefined") {
c@117:     exports.byteLength = byteLength
c@117:     exports.toByteArray = toByteArray
c@117:     exports.fromByteArray = fromByteArray
c@117: }
c@117: 
c@117: var lookup = []
c@117: var revLookup = []
c@117: var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
c@117: 
c@117: var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
c@117: for (var i = 0, len = code.length; i < len; ++i) {
c@117:   lookup[i] = code[i]
c@117:   revLookup[code.charCodeAt(i)] = i
c@117: }
c@117: 
c@117: revLookup['-'.charCodeAt(0)] = 62
c@117: revLookup['_'.charCodeAt(0)] = 63
c@117: 
c@117: function placeHoldersCount (b64) {
c@117:   var len = b64.length
c@117:   if (len % 4 > 0) {
c@117:     throw new Error('Invalid string. Length must be a multiple of 4')
c@117:   }
c@117: 
c@117:   // the number of equal signs (place holders)
c@117:   // if there are two placeholders, than the two characters before it
c@117:   // represent one byte
c@117:   // if there is only one, then the three characters before it represent 2 bytes
c@117:   // this is just a cheap hack to not do indexOf twice
c@117:   return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
c@117: }
c@117: 
c@117: function byteLength (b64) {
c@117:   // base64 is 4/3 + up to two characters of the original data
c@117:   return b64.length * 3 / 4 - placeHoldersCount(b64)
c@117: }
c@117: 
c@117: function toByteArray (b64) {
c@117:   var i, j, l, tmp, placeHolders, arr
c@117:   var len = b64.length
c@117:   placeHolders = placeHoldersCount(b64)
c@117: 
c@117:   arr = new Arr(len * 3 / 4 - placeHolders)
c@117: 
c@117:   // if there are placeholders, only get up to the last complete 4 chars
c@117:   l = placeHolders > 0 ? len - 4 : len
c@117: 
c@117:   var L = 0
c@117: 
c@117:   for (i = 0, j = 0; i < l; i += 4, j += 3) {
c@117:     tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
c@117:     arr[L++] = (tmp >> 16) & 0xFF
c@117:     arr[L++] = (tmp >> 8) & 0xFF
c@117:     arr[L++] = tmp & 0xFF
c@117:   }
c@117: 
c@117:   if (placeHolders === 2) {
c@117:     tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
c@117:     arr[L++] = tmp & 0xFF
c@117:   } else if (placeHolders === 1) {
c@117:     tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
c@117:     arr[L++] = (tmp >> 8) & 0xFF
c@117:     arr[L++] = tmp & 0xFF
c@117:   }
c@117: 
c@117:   return arr
c@117: }
c@117: 
c@117: function tripletToBase64 (num) {
c@117:   return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
c@117: }
c@117: 
c@117: function encodeChunk (uint8, start, end) {
c@117:   var tmp
c@117:   var output = []
c@117:   for (var i = start; i < end; i += 3) {
c@117:     tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
c@117:     output.push(tripletToBase64(tmp))
c@117:   }
c@117:   return output.join('')
c@117: }
c@117: 
c@117: function fromByteArray (uint8) {
c@117:   var tmp
c@117:   var len = uint8.length
c@117:   var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
c@117:   var output = ''
c@117:   var parts = []
c@117:   var maxChunkLength = 16383 // must be multiple of 3
c@117: 
c@117:   // go through the array every three bytes, we'll deal with trailing stuff later
c@117:   for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
c@117:     parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
c@117:   }
c@117: 
c@117:   // pad the end with zeros, but make sure to not forget the extra bytes
c@117:   if (extraBytes === 1) {
c@117:     tmp = uint8[len - 1]
c@117:     output += lookup[tmp >> 2]
c@117:     output += lookup[(tmp << 4) & 0x3F]
c@117:     output += '=='
c@117:   } else if (extraBytes === 2) {
c@117:     tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
c@117:     output += lookup[tmp >> 10]
c@117:     output += lookup[(tmp >> 4) & 0x3F]
c@117:     output += lookup[(tmp << 2) & 0x3F]
c@117:     output += '='
c@117:   }
c@117: 
c@117:   parts.push(output)
c@117: 
c@117:   return parts.join('')
c@117: }