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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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113
brouter-util/src/main/java/btools/util/ByteDataWriter.java
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@ -6,33 +6,30 @@
package btools.util;
public final class ByteDataWriter
public class ByteDataWriter extends ByteDataReader
{
private byte[] ab;
private int aboffset;
public ByteDataWriter( byte[] byteArray )
{
ab = byteArray;
super ( byteArray );
}
public void writeInt( int v )
{
ab[aboffset++] = (byte)( (v >> 24) & 0xff );
ab[aboffset++] = (byte)( (v >> 24) & 0xff );
ab[aboffset++] = (byte)( (v >> 16) & 0xff );
ab[aboffset++] = (byte)( (v >> 8) & 0xff );
ab[aboffset++] = (byte)( (v >> 8) & 0xff );
ab[aboffset++] = (byte)( (v ) & 0xff );
}
public void writeLong( long v )
{
ab[aboffset++] = (byte)( (v >> 56) & 0xff );
ab[aboffset++] = (byte)( (v >> 56) & 0xff );
ab[aboffset++] = (byte)( (v >> 48) & 0xff );
ab[aboffset++] = (byte)( (v >> 40) & 0xff );
ab[aboffset++] = (byte)( (v >> 40) & 0xff );
ab[aboffset++] = (byte)( (v >> 32) & 0xff );
ab[aboffset++] = (byte)( (v >> 24) & 0xff );
ab[aboffset++] = (byte)( (v >> 24) & 0xff );
ab[aboffset++] = (byte)( (v >> 16) & 0xff );
ab[aboffset++] = (byte)( (v >> 8) & 0xff );
ab[aboffset++] = (byte)( (v >> 8) & 0xff );
ab[aboffset++] = (byte)( (v ) & 0xff );
}
@ -51,31 +48,85 @@ public final class ByteDataWriter
ab[aboffset++] = (byte)( (v >> 8) & 0xff );
ab[aboffset++] = (byte)( (v ) & 0xff );
}
public void write( byte[] sa )
{
System.arraycopy( sa, 0, ab, aboffset, sa.length );
aboffset += sa.length;
}
public void write( byte[] sa, int offset, int len )
{
System.arraycopy( sa, offset, ab, aboffset, len );
aboffset += len;
}
public void ensureCapacity( int len )
public void writeVarBytes( byte[] sa )
{
// TODO
if ( sa == null )
{
writeVarLengthUnsigned( 0 );
}
else
{
int len = sa.length;
writeVarLengthUnsigned( len );
write( sa, 0, len );
}
}
public void writeModeAndDesc( boolean isReverse, byte[] sa )
{
int len = sa == null ? 0 : sa.length;
int sizecode = len << 1 | ( isReverse ? 1 : 0 );
writeVarLengthUnsigned( sizecode );
if ( len > 0 )
{
write( sa, 0, len );
}
}
public byte[] toByteArray()
{
byte[] c = new byte[aboffset];
System.arraycopy( ab, 0, c, 0, aboffset );
return c;
}
/**
* Just reserves a single byte and return it' offset.
* Used in conjunction with injectVarLengthUnsigned
* to efficiently write a size prefix
*
* @return the offset of the placeholder
*/
public int writeSizePlaceHolder()
{
return aboffset++;
}
public void injectSize( int sizeoffset )
{
int size = 0;
int datasize = aboffset-sizeoffset-1;
int v = datasize;
do
{
v >>= 7;
size++;
}
while( v != 0 );
if ( size > 1 ) // doesn't fit -> shift the data after the placeholder
{
System.arraycopy( ab, sizeoffset+1, ab, sizeoffset+size, datasize );
}
aboffset = sizeoffset;
writeVarLengthUnsigned( datasize );
aboffset = sizeoffset + size + datasize;
}
public int writeVarLengthSigned( int v )
{
return writeVarLengthUnsigned( v < 0 ? ( (-v) << 1 ) | 1 : v << 1 );
@ -83,29 +134,21 @@ public final class ByteDataWriter
public int writeVarLengthUnsigned( int v )
{
int start = aboffset;
do
{
int i7 = v & 0x7f;
v >>= 7;
if ( v != 0 ) i7 |= 0x80;
int start = aboffset;
do
{
int i7 = v & 0x7f;
v >>= 7;
if ( v != 0 ) i7 |= 0x80;
ab[aboffset++] = (byte)( i7 & 0xff );
}
while( v != 0 );
return aboffset - start;
}
while( v != 0 );
return aboffset - start;
}
public int size()
{
return aboffset;
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder( "[" );
for( int i=0; i<ab.length; i++ ) sb.append( i == 0 ? " " : ", " ).append( Integer.toString( ab[i] ) );
sb.append( " ]" );
return sb.toString();
}
}
}