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statistical encoding

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This commit is contained in:
Arndt 2015-10-11 19:27:33 +02:00
parent f8dee5b7d1
commit ccf6641bad
41 changed files with 4543 additions and 1965 deletions
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49
brouter-util/src/test/java/btools/util/BitCoderContextTest.java
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@ -1,8 +1,5 @@
package btools.util;
import java.util.Random;
import java.util.HashSet;
import org.junit.Assert;
import org.junit.Test;
@ -11,18 +8,46 @@ public class BitCoderContextTest
@Test
public void varBitsEncodeDecodeTest()
{
byte[] ab = new byte[4000];
BitCoderContext ctx = new BitCoderContext( ab );
for( int i=0; i<1000; i++ )
{
ctx.encodeVarBits( i );
byte[] ab = new byte[4000];
BitCoderContext ctx = new BitCoderContext( ab );
for ( int i = 0; i < 1000; i++ )
{
ctx.encodeVarBits( i );
}
ctx = new BitCoderContext( ab );
for( int i=0; i<1000; i++ )
{
ctx = new BitCoderContext( ab );
for ( int i = 0; i < 1000; i++ )
{
int value = ctx.decodeVarBits();
Assert.assertTrue( "distance value mismatch", value == i );
}
}
@Test
public void boundedEncodeDecodeTest()
{
byte[] ab = new byte[581969];
BitCoderContext ctx = new BitCoderContext( ab );
for ( int max = 1; max < 1000; max++ )
{
for ( int val = 0; val <= max; val++ )
{
ctx.encodeBounded( max, val );
}
}
ctx = new BitCoderContext( ab );
for ( int max = 1; max < 1000; max++ )
{
for ( int val = 0; val <= max; val++ )
{
int valDecoded = ctx.decodeBounded( max );
if ( valDecoded != val )
{
Assert.fail( "mismatch at max=" + max + " " + valDecoded + "<>" + val );
}
}
}
}
}