diff options
Diffstat (limited to 'node_modules/thirty-two/lib')
| -rw-r--r-- | node_modules/thirty-two/lib/thirty-two/index.js | 26 | ||||
| -rw-r--r-- | node_modules/thirty-two/lib/thirty-two/thirty-two.js | 128 |
2 files changed, 154 insertions, 0 deletions
diff --git a/node_modules/thirty-two/lib/thirty-two/index.js b/node_modules/thirty-two/lib/thirty-two/index.js new file mode 100644 index 0000000..8cb3e2f --- /dev/null +++ b/node_modules/thirty-two/lib/thirty-two/index.js @@ -0,0 +1,26 @@ +/* +Copyright (c) 2011, Chris Umbel + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. +*/ + +var base32 = require('./thirty-two'); + +exports.encode = base32.encode; +exports.decode = base32.decode; diff --git a/node_modules/thirty-two/lib/thirty-two/thirty-two.js b/node_modules/thirty-two/lib/thirty-two/thirty-two.js new file mode 100644 index 0000000..f884377 --- /dev/null +++ b/node_modules/thirty-two/lib/thirty-two/thirty-two.js @@ -0,0 +1,128 @@ +/* +Copyright (c) 2011, Chris Umbel + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. +*/ +'use strict'; + +var charTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"; +var byteTable = [ + 0xff, 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, + 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, + 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, + 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, + 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, + 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, + 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff +]; + +function quintetCount(buff) { + var quintets = Math.floor(buff.length / 5); + return buff.length % 5 === 0 ? quintets: quintets + 1; +} + +exports.encode = function(plain) { + if(!Buffer.isBuffer(plain)){ + plain = new Buffer(plain); + } + var i = 0; + var j = 0; + var shiftIndex = 0; + var digit = 0; + var encoded = new Buffer(quintetCount(plain) * 8); + + /* byte by byte isn't as pretty as quintet by quintet but tests a bit + faster. will have to revisit. */ + while(i < plain.length) { + var current = plain[i]; + + if(shiftIndex > 3) { + digit = current & (0xff >> shiftIndex); + shiftIndex = (shiftIndex + 5) % 8; + digit = (digit << shiftIndex) | ((i + 1 < plain.length) ? + plain[i + 1] : 0) >> (8 - shiftIndex); + i++; + } else { + digit = (current >> (8 - (shiftIndex + 5))) & 0x1f; + shiftIndex = (shiftIndex + 5) % 8; + if(shiftIndex === 0) i++; + } + + encoded[j] = charTable.charCodeAt(digit); + j++; + } + + for(i = j; i < encoded.length; i++) { + encoded[i] = 0x3d; //'='.charCodeAt(0) + } + + return encoded; +}; + +exports.decode = function(encoded) { + var shiftIndex = 0; + var plainDigit = 0; + var plainChar; + var plainPos = 0; + if(!Buffer.isBuffer(encoded)){ + encoded = new Buffer(encoded); + } + var decoded = new Buffer(Math.ceil(encoded.length * 5 / 8)); + + /* byte by byte isn't as pretty as octet by octet but tests a bit + faster. will have to revisit. */ + for(var i = 0; i < encoded.length; i++) { + if(encoded[i] === 0x3d){ //'=' + break; + } + + var encodedByte = encoded[i] - 0x30; + + if(encodedByte < byteTable.length) { + plainDigit = byteTable[encodedByte]; + + if(shiftIndex <= 3) { + shiftIndex = (shiftIndex + 5) % 8; + + if(shiftIndex === 0) { + plainChar |= plainDigit; + decoded[plainPos] = plainChar; + plainPos++; + plainChar = 0; + } else { + plainChar |= 0xff & (plainDigit << (8 - shiftIndex)); + } + } else { + shiftIndex = (shiftIndex + 5) % 8; + plainChar |= 0xff & (plainDigit >>> shiftIndex); + decoded[plainPos] = plainChar; + plainPos++; + + plainChar = 0xff & (plainDigit << (8 - shiftIndex)); + } + } else { + throw new Error('Invalid input - it is not base32 encoded string'); + } + } + + return decoded.slice(0, plainPos); +}; |