Simias::Sync::Delta::WeakHash Class Reference

Class to compute a weak hash for a block of data. The hash can be calculated quickly, and can be rolled. That is recaculated as the window is slid one byte at a time through a buffer. More...

List of all members.

Public Member Functions
UInt32	ComputeHash (byte[] buffer, int offset, UInt16 count)
	Computes the weak hash for a block of data.
UInt32	RollHash (int count, byte dropValue, byte addValue)
	Recalculates the weak hash droping the dropvalue and including the addValue.

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Detailed Description

Class to compute a weak hash for a block of data. The hash can be calculated quickly, and can be rolled. That is recaculated as the window is slid one byte at a time through a buffer.

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Member Function Documentation

UInt32 Simias::Sync::Delta::WeakHash::ComputeHash	(	byte[]	buffer,
		int	offset,
		UInt16	count
	)			[inline]

Computes the weak hash for a block of data.

Parameters:

	buffer	The buffer containing the data.
	offset	The offset in the block to start.
	count	The number of bytes to include in the hash.

Returns:

The weak hash code.

UInt32 Simias::Sync::Delta::WeakHash::RollHash	(	int	count,
		byte	dropValue,
		byte	addValue
	)			[inline]

Recalculates the weak hash droping the dropvalue and including the addValue.

Parameters:

	count
	dropValue	The byte to drop from the hash. This byte was at the begining of the last hash.
	addValue	The byte to add to the hash. This byte was one byte past the last hash block.

Returns:

The weak hash code.

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The documentation for this class was generated from the following file:

• src/core/Sync/WeakHash.cs