Package org.xiph.speex
Class OggCrc
- java.lang.Object
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- org.xiph.speex.OggCrc
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public class OggCrc extends java.lang.Object
Calculates the CRC checksum for Ogg packets.Ogg uses the same generator polynomial as ethernet, although with an unreflected alg and an init/final of 0, not 0xffffffff.
- Version:
- $Revision: 1.2 $
- Author:
- Jim Lawrence, helloNetwork.com, Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)
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Field Summary
Fields Modifier and Type Field Description private static int[]
crc_lookup
CRC checksum lookup table
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Constructor Summary
Constructors Constructor Description OggCrc()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static int
checksum(int crc, byte[] data, int offset, int length)
Calculates the checksum on the given data, from the give offset and for the given length, using the given initial value.
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Method Detail
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checksum
public static int checksum(int crc, byte[] data, int offset, int length)
Calculates the checksum on the given data, from the give offset and for the given length, using the given initial value. This allows on to calculate the checksum iteratively, by reinjecting the last returned value as the initial value when the function is called for the next data chunk. The initial value should be 0 for the first iteration.- Parameters:
crc
- - the initial valuedata
- - the dataoffset
- - the offset at which to start calculating the checksum.length
- - the length of data over which to calculate the checksum.- Returns:
- the checksum.
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