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242 lines (206 loc) · 6.03 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.DataInput;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* Wraps {@link ByteBuffer} and provides {@link DataInput}
*
* @author Jan Kotek
*/
public final class DataInput2 implements DataInput, DataIO.DataInputInternal {
public final ByteBuffer buf;
public int pos;
public DataInput2(final ByteBuffer buf, final int pos) {
this.buf = buf;
this.pos = pos;
}
/**
* @deprecated use {@link org.mapdb.DataIO.DataInputByteArray}
*/
public DataInput2(byte[] b) {
this(ByteBuffer.wrap(b),0);
}
@Override
public void readFully(byte[] b) throws IOException {
readFully(b, 0, b.length);
}
@Override
public void readFully(byte[] b, int off, int len) throws IOException {
ByteBuffer clone = buf.duplicate();
clone.position(pos);
pos+=len;
clone.get(b,off,len);
}
@Override
public int skipBytes(final int n) throws IOException {
pos +=n;
return n;
}
@Override
public boolean readBoolean() throws IOException {
return buf.get(pos++) ==1;
}
@Override
public byte readByte() throws IOException {
return buf.get(pos++);
}
@Override
public int readUnsignedByte() throws IOException {
return buf.get(pos++)& 0xff;
}
@Override
public short readShort() throws IOException {
final short ret = buf.getShort(pos);
pos+=2;
return ret;
}
@Override
public int readUnsignedShort() throws IOException {
return (( (buf.get(pos++) & 0xff) << 8) |
( (buf.get(pos++) & 0xff)));
}
@Override
public char readChar() throws IOException {
// I know: 4 bytes, but char only consumes 2,
// has to stay here for backward compatibility
return (char) readInt();
}
@Override
public int readInt() throws IOException {
final int ret = buf.getInt(pos);
pos+=4;
return ret;
}
@Override
public long readLong() throws IOException {
final long ret = buf.getLong(pos);
pos+=8;
return ret;
}
@Override
public float readFloat() throws IOException {
final float ret = buf.getFloat(pos);
pos+=4;
return ret;
}
@Override
public double readDouble() throws IOException {
final double ret = buf.getDouble(pos);
pos+=8;
return ret;
}
@Override
public String readLine() throws IOException {
return readUTF();
}
@Override
public String readUTF() throws IOException {
final int size = DataInput2.unpackInt(this);
return SerializerBase.deserializeString(this, size);
}
/* unpackInt and unpackLong 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.
*/
/**
* Unpack positive int value from the input stream.
*
* This method originally comes from Kryo Framework, author Nathan Sweet.
* It was heavily modified to fit MapDB needs.
*
* @param is The input stream.
* @return The long value.
* @throws java.io.IOException
*/
static public int unpackInt(DataInput is) throws IOException {
int offset = 0;
int result=0;
int b;
do {
b = is.readUnsignedByte();
result |= (b & 0x7F) << offset;
offset += 7;
}while((b & 0x80) != 0);
return result;
}
/**
* Unpack positive long value from the input stream.
*
* This method originally comes from Kryo Framework, author Nathan Sweet.
* It was heavily modified to fit MapDB needs.
*
* @param in The input stream.
* @return The long value.
* @throws java.io.IOException
*/
static public long unpackLong(DataInput in) throws IOException {
int offset = 0;
long result=0;
long b;
do {
b = in.readUnsignedByte();
result |= (b & 0x7F) << offset;
offset += 7;
}while((b & 0x80) != 0);
return result;
}
@Override
public int getPos() {
return pos;
}
@Override
public void setPos(int pos) {
this.pos = pos;
}
@Override
public byte[] internalByteArray() {
return null;
}
@Override
public ByteBuffer internalByteBuffer() {
return buf;
}
@Override
public void close() {
}
}