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/var/runtime/node_modules/@aws-sdk/node_modules/base64-js

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index.js3.8 KB · 151 lines
'use strict' exports.byteLength = byteLengthexports.toByteArray = toByteArrayexports.fromByteArray = fromByteArray var lookup = []var revLookup = []var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'for (var i = 0, len = code.length; i < len; ++i) {  lookup[i] = code[i]  revLookup[code.charCodeAt(i)] = i} // Support decoding URL-safe base64 strings, as Node.js does.// See: https://en.wikipedia.org/wiki/Base64#URL_applicationsrevLookup['-'.charCodeAt(0)] = 62revLookup['_'.charCodeAt(0)] = 63 function getLens (b64) {  var len = b64.length   if (len % 4 > 0) {    throw new Error('Invalid string. Length must be a multiple of 4')  }   // Trim off extra bytes after placeholder bytes are found  // See: https://github.com/beatgammit/base64-js/issues/42  var validLen = b64.indexOf('=')  if (validLen === -1) validLen = len   var placeHoldersLen = validLen === len    ? 0    : 4 - (validLen % 4)   return [validLen, placeHoldersLen]} // base64 is 4/3 + up to two characters of the original datafunction byteLength (b64) {  var lens = getLens(b64)  var validLen = lens[0]  var placeHoldersLen = lens[1]  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen} function _byteLength (b64, validLen, placeHoldersLen) {  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen} function toByteArray (b64) {  var tmp  var lens = getLens(b64)  var validLen = lens[0]  var placeHoldersLen = lens[1]   var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))   var curByte = 0   // if there are placeholders, only get up to the last complete 4 chars  var len = placeHoldersLen > 0    ? validLen - 4    : validLen   var i  for (i = 0; i < len; i += 4) {    tmp =      (revLookup[b64.charCodeAt(i)] << 18) |      (revLookup[b64.charCodeAt(i + 1)] << 12) |      (revLookup[b64.charCodeAt(i + 2)] << 6) |      revLookup[b64.charCodeAt(i + 3)]    arr[curByte++] = (tmp >> 16) & 0xFF    arr[curByte++] = (tmp >> 8) & 0xFF    arr[curByte++] = tmp & 0xFF  }   if (placeHoldersLen === 2) {    tmp =      (revLookup[b64.charCodeAt(i)] << 2) |      (revLookup[b64.charCodeAt(i + 1)] >> 4)    arr[curByte++] = tmp & 0xFF  }   if (placeHoldersLen === 1) {    tmp =      (revLookup[b64.charCodeAt(i)] << 10) |      (revLookup[b64.charCodeAt(i + 1)] << 4) |      (revLookup[b64.charCodeAt(i + 2)] >> 2)    arr[curByte++] = (tmp >> 8) & 0xFF    arr[curByte++] = tmp & 0xFF  }   return arr} function tripletToBase64 (num) {  return lookup[num >> 18 & 0x3F] +    lookup[num >> 12 & 0x3F] +    lookup[num >> 6 & 0x3F] +    lookup[num & 0x3F]} function encodeChunk (uint8, start, end) {  var tmp  var output = []  for (var i = start; i < end; i += 3) {    tmp =      ((uint8[i] << 16) & 0xFF0000) +      ((uint8[i + 1] << 8) & 0xFF00) +      (uint8[i + 2] & 0xFF)    output.push(tripletToBase64(tmp))  }  return output.join('')} function fromByteArray (uint8) {  var tmp  var len = uint8.length  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes  var parts = []  var maxChunkLength = 16383 // must be multiple of 3   // go through the array every three bytes, we'll deal with trailing stuff later  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))  }   // pad the end with zeros, but make sure to not forget the extra bytes  if (extraBytes === 1) {    tmp = uint8[len - 1]    parts.push(      lookup[tmp >> 2] +      lookup[(tmp << 4) & 0x3F] +      '=='    )  } else if (extraBytes === 2) {    tmp = (uint8[len - 2] << 8) + uint8[len - 1]    parts.push(      lookup[tmp >> 10] +      lookup[(tmp >> 4) & 0x3F] +      lookup[(tmp << 2) & 0x3F] +      '='    )  }   return parts.join('')}