org.xiph.speex
Class OggCrc
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.
- Jim Lawrence, helloNetwork.com
- Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)
private static int[] | crc_lookup - CRC checksum lookup table
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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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crc_lookup
private static int[] crc_lookup
CRC checksum lookup table
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.
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.
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