gistfile1.scala

package lsug

import java.security.MessageDigest
import java.io.{BufferedInputStream, FileInputStream}


object SchemaString extends App {

  implicit class SchemaHelper(val sc: StringContext) extends AnyVal {
    def schema(a: Any*): String = sc.parts.head.split('\n').map( _.trim).mkString("\n")
  }


  val s = schema"""@totalColumns 3
     Name:
     Age:"""

  println(s)


  // https://github.com/lift/framework/blob/master/core/util/src/main/scala/net/liftweb/util/SecurityHelpers.scala

  /** encode a Byte array as hexadecimal characters */
  def hexEncode(in: Array[Byte]): String = {
    val sb = new StringBuilder
    val len = in.length
    def addDigit(in: Array[Byte], pos: Int, len: Int, sb: StringBuilder) {
      if (pos < len) {
        val b: Int = in(pos)
        val msb = (b & 0xf0) >> 4
        val lsb = (b & 0x0f)
        sb.append((if (msb < 10) ('0' + msb).asInstanceOf[Char] else ('a' + (msb - 10)).asInstanceOf[Char]))
        sb.append((if (lsb < 10) ('0' + lsb).asInstanceOf[Char] else ('a' + (lsb - 10)).asInstanceOf[Char]))

        addDigit(in, pos + 1, len, sb)
      }
    }
    addDigit(in, 0, len, sb)
    sb.toString
  }

  /** create a MD5 digest from a Byte array */

  val fileName = """/Users/andy/Downloads/scala-docs-2.10.0.zip"""

  val digest = MessageDigest.getInstance("MD5")
  val file = new BufferedInputStream(new FileInputStream(fileName))
  Stream.continually(file.read).takeWhile(-1 !=).map(_.toByte).foreach( digest.update(_))
  val hexStr = hexEncode(digest.digest)

  val same = hexStr == "699d61aff25f16a5560372e610da91ab"

  println( s"Hex: $hexStr  $same")
}