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Copy pathDataOutput2.java
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263 lines (222 loc) · 7.34 KB
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/*
* Copyright (c) 2012 Jan Kotek
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.mapdb;
import java.io.DataOutput;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
/**
* Provides {@link DataOutput} implementation on top of growable {@code byte[]}
* <p/>
* {@link java.io.ByteArrayOutputStream} is not used as it requires {@code byte[]} copying
*
* @author Jan Kotek
*/
public final class DataOutput2 extends OutputStream implements DataOutput {
public byte[] buf;
public int pos;
public int sizeMask;
public DataOutput2(){
pos = 0;
buf = new byte[16]; //TODO take hint from serializer for initial size
sizeMask = 0xFFFFFFFF-(buf.length-1);
}
public byte[] copyBytes(){
return Arrays.copyOf(buf, pos);
}
/**
* make sure there will be enough space in buffer to write N bytes
*/
public void ensureAvail(int n) {
n+=pos;
if ((n&sizeMask)!=0) {
int newSize = buf.length;
while(newSize<n){
newSize<<=2;
sizeMask<<=2;
}
buf = Arrays.copyOf(buf, newSize);
}
}
public static int nextPowTwo(final int a)
{
int b = 1;
while (b < a)
{
b = b << 1;
}
return b;
}
@Override
public void write(final int b) throws IOException {
ensureAvail(1);
buf[pos++] = (byte) b;
}
@Override
public void write(final byte[] b, final int off, final int len) throws IOException {
ensureAvail(len);
System.arraycopy(b, off, buf, pos, len);
pos += len;
}
@Override
public void writeBoolean(final boolean v) throws IOException {
ensureAvail(1);
buf[pos++] = (byte) (v ? 1 : 0);
}
@Override
public void writeByte(final int v) throws IOException {
ensureAvail(1);
buf[pos++] = (byte) (v);
}
@Override
public void writeShort(final int v) throws IOException {
ensureAvail(2);
buf[pos++] = (byte) (0xff & (v >> 8));
buf[pos++] = (byte) (0xff & (v));
}
@Override
public void writeChar(final int v) throws IOException {
// I know: 4 bytes, but char only consumes 2,
// has to stay here for backward compatibility
writeInt(v);
}
@Override
public void writeInt(final int v) throws IOException {
ensureAvail(4);
buf[pos++] = (byte) (0xff & (v >> 24));
buf[pos++] = (byte) (0xff & (v >> 16));
buf[pos++] = (byte) (0xff & (v >> 8));
buf[pos++] = (byte) (0xff & (v));
}
@Override
public void writeLong(final long v) throws IOException {
ensureAvail(8);
buf[pos++] = (byte) (0xff & (v >> 56));
buf[pos++] = (byte) (0xff & (v >> 48));
buf[pos++] = (byte) (0xff & (v >> 40));
buf[pos++] = (byte) (0xff & (v >> 32));
buf[pos++] = (byte) (0xff & (v >> 24));
buf[pos++] = (byte) (0xff & (v >> 16));
buf[pos++] = (byte) (0xff & (v >> 8));
buf[pos++] = (byte) (0xff & (v));
}
@Override
public void writeFloat(final float v) throws IOException {
writeInt(Float.floatToIntBits(v));
}
@Override
public void writeDouble(final double v) throws IOException {
writeLong(Double.doubleToLongBits(v));
}
@Override
public void writeBytes(final String s) throws IOException {
writeUTF(s);
}
@Override
public void writeChars(final String s) throws IOException {
writeUTF(s);
}
@Override
public void writeUTF(final String s) throws IOException {
final int len = s.length();
packInt(len);
for (int i = 0; i < len; i++) {
int c = (int) s.charAt(i);
packInt(c);
}
}
/* packInt and packLong originally come from Kryo framework and were written by Nathan Sweet.
* It was modified to fit MapDB purposes.
* It is relicensed from BSD to Apache 2 with his permission:
*
* Date: 27.5.2014 12:44
*
* Hi Jan,
*
* I'm fine with you putting code from the Kryo under Apache 2.0, as long as you keep the copyright and author. :)
*
* Cheers!
* -Nate
*
* -----------------------------
*
* Copyright (c) 2012 Nathan Sweet
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Pack non-negative long into output stream.
* It will occupy 1-10 bytes depending on value (lower values occupy smaller space)
*
* This method originally comes from Kryo Framework, author Nathan Sweet.
* It was modified to fit MapDB needs.
*
* @param out DataOutput to put value into
* @param value to be serialized, must be non-negative
* @throws java.io.IOException
*
*/
static public void packLong(DataOutput out, long value) throws IOException {
if(CC.PARANOID && value<0)
throw new AssertionError("negative value: "+value);
while ((value & ~0x7FL) != 0) {
out.write((((int) value & 0x7F) | 0x80));
value >>>= 7;
}
out.write((byte) value);
}
/**
* Pack non-negative long into output stream.
* It will occupy 1-5 bytes depending on value (lower values occupy smaller space)
*
* This method originally comes from Kryo Framework, author Nathan Sweet.
* It was modified to fit MapDB needs.
*
* @param in DataOutput to put value into
* @param value to be serialized, must be non-negative
* @throws IOException
*/
static public void packInt(DataOutput in, int value) throws IOException {
if(CC.PARANOID && value<0)
throw new AssertionError("negative value: "+value);
while ((value & ~0x7F) != 0) {
in.write(((value & 0x7F) | 0x80));
value >>>= 7;
}
in.write((byte) value);
}
protected void packInt(int value) throws IOException {
if(CC.PARANOID && value<0)
throw new AssertionError("negative value: "+value);
while ((value & ~0x7F) != 0) {
ensureAvail(1);
buf[pos++]= (byte) ((value & 0x7F) | 0x80);
value >>>= 7;
}
ensureAvail(1);
buf[pos++]= (byte) value;
}
}