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POBitstream Library in Scala
 

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    <p>I need to compress/decompress some Data with a old, in house developed Algorithm. There i have a lot of operations like:</p> <pre><code>if the next bit is 0 take the following 6 Bits and interpret them as an Int if the next bits are 10 take the following 9 Bits and interpret them as an Int etc. </code></pre> <p>Knows somebody something like a "Bitstrem" class in Scala? (I didn't found anything and hope that i didn't have to implement it by myself.)</p> <p>Thanks</p> <p>Edit: I combined the answer with <a href="http://www.scala-lang.org/node/8413" rel="nofollow">http://www.scala-lang.org/node/8413</a> ("The Architecture of Scala Collections") If somebody needs the samething:</p> <pre><code>abstract class Bit object Bit { val fromInt: Int =&gt; Bit = Array(Low, High) val toInt: Bit =&gt; Int = Map(Low -&gt; 0, High -&gt; 1) } case object High extends Bit case object Low extends Bit import collection.IndexedSeqLike import collection.mutable.{Builder, ArrayBuffer} import collection.generic.CanBuildFrom import collection.IndexedSeq // IndexedSeqLike implements all concrete methods of IndexedSeq // with newBuilder. (methods like take, filter, drop) final class BitSeq private (val bits: Array[Int], val length: Int) extends IndexedSeq[Bit] with IndexedSeqLike[Bit, BitSeq] { import BitSeq._ // Mandatory for IndexedSeqLike override protected[this] def newBuilder: Builder[Bit, BitSeq] = BitSeq.newBuilder //Mandatory for IndexedSeq def apply(idx: Int): Bit = { if(idx &lt; 0 || length &lt;= idx) throw new IndexOutOfBoundsException Bit.fromInt(bits(idx/N) &gt;&gt; (idx % N) &amp; M) } } object BitSeq { // Bits per Int private val N = 32 // Bitmask to isolate a bit private val M = 0x01 def fromSeq(buf: Seq[Bit]): BitSeq = { val bits = new Array[Int]((buf.length + N - 1) / N) for(i &lt;- 0 until buf.length) { bits(i/N) |= Bit.toInt(buf(i)) &lt;&lt; (i % N) } new BitSeq(bits, buf.length) } def apply(bits: Bit*) = fromSeq(bits) def newBuilder: Builder[Bit, BitSeq] = new ArrayBuffer mapResult fromSeq // Needed for map etc. (BitSeq map {:Bit} should return a BitSeq) implicit def canBuilderFrom: CanBuildFrom[BitSeq, Bit, BitSeq] = new CanBuildFrom[BitSeq, Bit, BitSeq] { def apply(): Builder[Bit, BitSeq] = newBuilder def apply(from: BitSeq): Builder[Bit, BitSeq] = newBuilder } } </code></pre>
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