org.hammerlab.math

VarNum

object VarNum

Serialization wrapper for Longs which burns one bit per byte indicating whether any more bytes follow.

Can utilize less serialized space than naively writing 8-byte Longs in datasets where absolute values tend to be less than 248 more often than they are ≥ 255.

Long's absolute values correspond to the following number of serialized bytes:

[ 0, 26): 1 byte [ 26, 213): 2 bytes [213, 220): 3 bytes [220, 227): 4 bytes [227, 234): 5 bytes [234, 241): 6 bytes [241, 248): 7 bytes [248, 255): 8 bytes [255, 2^63): 9 bytes

The first byte, in addition to its most significant bit indicating whether any more bites follow, uses its second-most-significant bit to represent the sign of the Long.

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  1. final def !=(arg0: AnyRef): Boolean

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  2. final def !=(arg0: Any): Boolean

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  3. final def ##(): Int

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  4. final def ==(arg0: AnyRef): Boolean

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  10. def finalize(): Unit

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  11. final def getClass(): Class[_]

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  13. final def isInstanceOf[T0]: Boolean

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  14. final def ne(arg0: AnyRef): Boolean

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  15. final def notify(): Unit

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  16. final def notifyAll(): Unit

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  17. def read(input: InputStream): Long

  18. final def synchronized[T0](arg0: ⇒ T0): T0

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  19. def toString(): String

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  20. final def wait(): Unit

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  21. final def wait(arg0: Long, arg1: Int): Unit

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  22. final def wait(arg0: Long): Unit

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  23. def write(output: OutputStream, l: Long): Unit

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