convert-hex/convert-hex.js

Convert to/from hex string and array of bytes

!function(globals) {
'use strict'

var convertHex = {
  bytesToHex: function(bytes) {
    /*if (typeof bytes.byteLength != 'undefined') {
      var newBytes = []

      if (typeof bytes.buffer != 'undefined')
        bytes = new DataView(bytes.buffer)
      else
        bytes = new DataView(bytes)

      for (var i = 0; i < bytes.byteLength; ++i) {
        newBytes.push(bytes.getUint8(i))
      }
      bytes = newBytes
    }*/
    return arrBytesToHex(bytes)
  },
  hexToBytes: function(hex) {
    if (hex.length % 2 === 1) throw new Error("hexToBytes can't have a string with an odd number of characters.")
    if (hex.indexOf('0x') === 0) hex = hex.slice(2)
    return hex.match(/../g).map(function(x) { return parseInt(x,16) })
  }
}


// PRIVATE

function arrBytesToHex(bytes) {
  return bytes.map(function(x) { return padLeft(x.toString(16),2) }).join('')
}

function padLeft(orig, len) {
  if (orig.length > len) return orig
  return Array(len - orig.length + 1).join('0') + orig
}


if (typeof module !== 'undefined' && module.exports) { //CommonJS
  module.exports = convertHex
} else {
  globals.convertHex = convertHex
}

}(this);