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corrected lazy crc logic

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This commit is contained in:
Arndt Brenschede 2019-07-22 19:25:13 +02:00
parent e4c11e6dbf
commit 0a6ead24a1
5 changed files with 24 additions and 23 deletions
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4
brouter-mapaccess/src/main/java/btools/mapaccess/DirectWeaver.java
View file

@ -20,14 +20,12 @@ public final class DirectWeaver extends ByteDataWriter
private int size = 0;
public DirectWeaver( DataBuffers dataBuffers, int lonIdx, int latIdx, int divisor, TagValueValidator wayValidator, WaypointMatcher waypointMatcher, OsmNodesMap hollowNodes ) throws Exception
public DirectWeaver( StatCoderContext bc, DataBuffers dataBuffers, int lonIdx, int latIdx, int divisor, TagValueValidator wayValidator, WaypointMatcher waypointMatcher, OsmNodesMap hollowNodes ) throws Exception
{
super( null );
int cellsize = 1000000 / divisor;
id64Base = ((long)(lonIdx*cellsize))<<32 | (latIdx*cellsize);
StatCoderContext bc = new StatCoderContext( dataBuffers.iobuffer );
TagValueCoder wayTagCoder = new TagValueCoder( bc, dataBuffers, wayValidator );
TagValueCoder nodeTagCoder = new TagValueCoder( bc, dataBuffers, null );
NoisyDiffCoder nodeIdxDiff = new NoisyDiffCoder( bc );

33
brouter-mapaccess/src/main/java/btools/mapaccess/OsmFile.java
View file

@ -11,6 +11,7 @@ import java.io.RandomAccessFile;
import btools.codec.DataBuffers;
import btools.codec.MicroCache;
import btools.codec.MicroCache2;
import btools.codec.StatCoderContext;
import btools.codec.TagValueValidator;
import btools.codec.WaypointMatcher;
import btools.util.ByteDataReader;
@ -142,9 +143,10 @@ final class OsmFile
{
ab = new byte[asize];
asize = getDataInputForSubIdx( subIdx, ab );
dataBuffers = new DataBuffers( ab );
}
StatCoderContext bc = new StatCoderContext( ab );
try
{
if ( !reallyDecode )
@ -153,25 +155,28 @@ final class OsmFile
}
if ( hollowNodes == null )
{
return new MicroCache2( dataBuffers, lonIdx, latIdx, divisor, wayValidator, waypointMatcher );
return new MicroCache2( bc, dataBuffers, lonIdx, latIdx, divisor, wayValidator, waypointMatcher );
}
new DirectWeaver( dataBuffers, lonIdx, latIdx, divisor, wayValidator, waypointMatcher, hollowNodes );
new DirectWeaver( bc, dataBuffers, lonIdx, latIdx, divisor, wayValidator, waypointMatcher, hollowNodes );
return MicroCache.emptyNonVirgin;
}
catch( Throwable t )
finally
{
// checksum test now only in case of trouble
int crcData = Crc32.crc( ab, 0, asize - 4 );
int crcFooter = new ByteDataReader( ab, asize - 4 ).readInt();
if ( crcData == crcFooter )
// crc check only if the buffer has not been fully read
int readBytes = (bc.getReadingBitPosition()+7)>>3;
if ( readBytes != asize-4 )
{
throw new IOException( "old, unsupported data-format" );
int crcData = Crc32.crc( ab, 0, asize - 4 );
int crcFooter = new ByteDataReader( ab, asize - 4 ).readInt();
if ( crcData == crcFooter )
{
throw new IOException( "old, unsupported data-format" );
}
else if ( ( crcData ^ 2 ) != crcFooter )
{
throw new IOException( "checkum error" );
}
}
else if ( ( crcData ^ 2 ) == crcFooter )
{
throw new IOException( "checkum error" );
}
throw t instanceof Exception ? (Exception)t : new Exception( t.toString(), t );
}
}