private void endBlock() {
m_computedBlockCRC = m_crc.getFinalCRC();
/*
* A bad CRC is considered a fatal error.
*/
if (m_storedBlockCRC != m_computedBlockCRC) {
crcError();
}
m_computedCombinedCRC = (m_computedCombinedCRC << 1) | (m_computedCombinedCRC >>> 31);
m_computedCombinedCRC ^= m_computedBlockCRC;
}
private void endBlock() throws IOException {
blockCRC = crc.getFinalCRC();
combinedCRC = (combinedCRC << 1) | (combinedCRC >>> 31);
combinedCRC ^= blockCRC;
/*
* sort the block and establish posn of original string
*/
doReversibleTransformation();
/*
* A 6-byte block header, the value chosen arbitrarily
* as 0x314159265359 :-). A 32 bit value does not really
* give a strong enough guarantee that the value will not
* appear by chance in the compressed datastream. Worst-case
* probability of this event, for a 900k block, is about
* 2.0e-3 for 32 bits, 1.0e-5 for 40 bits and 4.0e-8 for 48 bits.
* For a compressed file of size 100Gb -- about 100000 blocks --
* only a 48-bit marker will do. NB: normal compression/
* decompression do *not* rely on these statistical properties.
* They are only important when trying to recover blocks from
* damaged files.
*/
bsPutUChar(0x31);
bsPutUChar(0x41);
bsPutUChar(0x59);
bsPutUChar(0x26);
bsPutUChar(0x53);
bsPutUChar(0x59);
/*
* Now the block's CRC, so it is in a known place.
*/
bsPutint(blockCRC);
/*
* Now a single bit indicating randomisation.
*/
if (blockRandomised) {
bsW(1, 1);
} else {
bsW(1, 0);
}
/*
* Finally, block's contents proper.
*/
moveToFrontCodeAndSend();
}
