bool CompressedFitsWriter::writeCompressedDataToDisk ( uint32_t  threadID, uint32_t  sizeToWrite  )

private

writes an already compressed buffer to disk

Definition at line 1377 of file fitsCompressor.cc.

References _checkOffset, CompressedFitsFile::_checksum, CompressedFitsFile::_compressedBuffer, CompressedFitsFile::_file, and Checksum::add().

Referenced by close(), and threadFunction().

{
    char* checkSumPointer = _compressedBuffer[threadID];
    int32_t extraBytes = 0;
    uint32_t sizeToChecksum = sizeToWrite;
    if (_checkOffset != 0)
    {//should we extend the array to the left ?
        sizeToChecksum += _checkOffset;
        checkSumPointer -= _checkOffset;
        memset(checkSumPointer, 0, _checkOffset);
    }
    if (sizeToChecksum%4 != 0)
    {//should we extend the array to the right ?
        extraBytes = 4 - (sizeToChecksum%4);
        memset(checkSumPointer+sizeToChecksum, 0,extraBytes);
        sizeToChecksum += extraBytes;
    }
    //do the checksum
    _checksum.add(checkSumPointer, sizeToChecksum);
//    cout << endl << "Checksum: " << _checksum.val() << endl;
    _checkOffset = (4 - extraBytes)%4;
    //write data to disk
    _file.write(_compressedBuffer[threadID], sizeToWrite);
    return _file.good();
}

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