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package org.openslx.imagemaster.crcchecker;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import java.util.zip.CRC32;
import org.apache.log4j.Logger;
public class CRCChecker
{
private static Logger log = Logger.getLogger( CRCChecker.class );
private static final int blockSize = 16 * 1024 * 1024;
/**
* Checks the CRC sum of given blocks of a given imageFile against a given crcFile.
* The caller needs to make sure that block that are going to be checked are complete!
*
* @param imageFile The imageFile to check
* @param crcFile The crcFile to check against
* @param blocks The blocks to check
* @return List of blocks where the crc matches, or null if the crc file is corrupted
* @throws IOException When crc file could not be read
*/
public static List<Integer> checkCRC( String imageFile, String crcFile, List<Integer> blocks ) throws IOException
{
List<Integer> result = new LinkedList<>();
ImageFile image = new ImageFile( imageFile, blockSize );
CRCFile crc = new CRCFile( crcFile );
log.debug( "Checking image file: '" + imageFile + "' with crc file: '" + crcFile + "'" );
try {
if ( !crc.isValid() )
return null;
// TODO: also return null if the crc file contains the wrong number of checksums (only makes sense if the upload is complete)
} catch ( IOException e ) {
throw new IOException( "Could not read CRC file", e );
}
// check all blocks
byte[] block = new byte[blockSize];
for ( Integer blockN : blocks ) {
try {
image.getBlock( blockN, block );
} catch ( IOException e ) {
throw new IOException( "Could not read image file", e );
}
if ( block == null )
continue; // some error occured (for example: someone tried to check a block that is not in the file)
// check this block with CRC32
// add this block to result, if check was ok with CRC file
CRC32 crcCalc = new CRC32();
crcCalc.update( block );
int crcSum = Integer.reverseBytes( (int)crcCalc.getValue() );
int crcSumFromFile;
try {
crcSumFromFile = crc.getCRCSum( blockN );
} catch ( IOException e ) {
throw new IOException( "Could not read CRC file", e );
}
if ( crcSum == crcSumFromFile )
result.add( blockN );
else
log.debug( blockN + " was invalid" );
}
return result;
}
}
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