Initial commit

1 files changed, 109 insertions, 0 deletions

diff --git a/src/ByteUtils.scala b/src/ByteUtils.scala
new file mode 100644
index 0000000..3b6046c
--- /dev/null
+++ b/src/ByteUtils.scala
@@ -0,0 +1,109 @@
+package main.utils
+
+object ByteUtils {
+  trait SizedNumeric[T] {
+    def manifest: Manifest[T]
+    def byteSize: Int
+    def bitSize: Int
+    def fromLong(l: Long): T
+    def toLong(l: T): Long
+    def buildFrom[U : SizedNumeric](from: U): T = fromLong(from.toLong)
+    def truncate[U : SizedNumeric](from: U): T = buildFrom(from)
+    override def toString = s"SizedNumeric[${manifest}]"
+  }
+
+  trait BitOps[T] {
+    def @>>>(t: T, x: Int): T
+    def @<<(t: T, x: Int): T
+    def @|(a: T, b: T): T
+    def @&(a: T, b: T): T
+    def @+(a: T, b: T): T
+  }
+
+  implicit val byteOps: BitOps[Byte] = new BitOps[Byte] {
+    def @>>>(t: Byte, x: Int): Byte = (t >>> x).toByte
+    def @<<(t: Byte, x: Int): Byte = (t << x).toByte
+    def @|(a: Byte, b: Byte): Byte = (a | b).toByte
+    def @&(a: Byte, b: Byte): Byte = (a & b).toByte
+    def @+(a: Byte, b: Byte): Byte = (a + b).toByte
+  }
+
+  implicit val intOps: BitOps[Int] = new BitOps[Int] {
+    def @>>>(t: Int, x: Int): Int = t >>> x
+    def @<<(t: Int, x: Int): Int = (t << x)
+    def @|(a: Int, b: Int): Int = a | b
+    def @&(a: Int, b: Int): Int = a & b
+    def @+(a: Int, b: Int): Int = a + b
+  }
+
+  implicit class WithBitOpts[T : BitOps](x: T) {
+    def @>>>(b: Int): T = implicitly[BitOps[T]].@>>>(x, b)
+    def @<<(b: Int): T = implicitly[BitOps[T]].@<<(x, b)
+    def @|(b: T): T = implicitly[BitOps[T]].@|(x, b)
+    def @&(b: T): T = implicitly[BitOps[T]].@&(x, b)
+    def @+(b: T): T = implicitly[BitOps[T]].@+(x, b)
+  }
+
+  implicit class SizedWithByteInfo[T : SizedNumeric](x: T) {
+    def byteSize = implicitly[SizedNumeric[T]].byteSize
+    def bitSize = implicitly[SizedNumeric[T]].bitSize
+    def toLong = implicitly[SizedNumeric[T]].toLong(x)
+    def liftedTo[U : SizedNumeric]: U = {
+      val uSize = implicitly[SizedNumeric[U]]
+      val tSize = implicitly[SizedNumeric[T]]
+      if (uSize.byteSize < tSize.byteSize) {
+        throw new RuntimeException(s"Target size ($uSize) is smaller than the source size ($tSize)")
+      }
+
+      uSize.buildFrom(x)
+    }
+    def truncatedTo[U : SizedNumeric]: U = {
+      implicitly[SizedNumeric[U]].truncate(x)
+    }
+  }
+
+  implicit class RichArrayOfBytes(b: Array[Byte]) {
+    def to[T : SizedNumeric : BitOps]: T = {
+      val numeric = implicitly[SizedNumeric[T]]
+      if(b.length < numeric.byteSize) {
+        throw new RuntimeException("Byte input is not long enough")
+      }
+
+      var out: Long = b(0)
+      for(i <- 1 until numeric.byteSize) {
+        out << 8
+        out = b(i) | out
+      }
+      numeric.fromLong(out)
+    }
+  }
+  def sizedNumeric[T : Manifest](bytes: Int)(from: Long => T)(to: T => Long) = new SizedNumeric[T] {
+    def manifest = implicitly[Manifest[T]]
+    def byteSize = bytes
+    def bitSize = bytes * 8
+    def toLong(t: T) = to(t)
+    def fromLong(l: Long) = from(l)
+  }
+
+  implicit val intSized = sizedNumeric(4) { x: Long => x.toInt } { _.toLong }
+  implicit val shortized = sizedNumeric(2) { x: Long => x.toShort } { _.toLong }
+  implicit val byteSized = sizedNumeric(1) { x: Long => x.toByte } { _.toLong }
+
+  def toArrayBuf[T : SizedNumeric : BitOps](x: T): Array[Byte] = {
+    val buf = new Array[Byte](x.byteSize)
+    for(i <- 0 until x.byteSize) {
+      val shiftAmount: Int = (x.byteSize - i - 1) << 3
+      buf(i) = (x @>>> shiftAmount).truncatedTo[Byte]
+    }
+    buf
+  }
+
+  def toBinaryString[T : SizedNumeric](x: T)(implicit a: BitOps[T]): String = {
+    val buf = new StringBuilder(x.bitSize)
+    for(i <- 0 until x.bitSize) {
+      val shiftAmount: Int = x.bitSize - i - 1
+      buf.append((x @>>> shiftAmount) @& 0x01.liftedTo[T])
+    }
+    buf.toString()
+  }
+}