//
// MessagePack for Java
//
// Copyright (C) 2009-2011 FURUHASHI Sadayuki
//
// 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.msgpack.io;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.io.IOException;
import java.io.EOFException;
public class StreamInput implements Input {
private final InputStream in;
private byte[] castBuffer;
private ByteBuffer castByteBuffer;
private int filled;
public StreamInput(InputStream in) {
this.in = in;
this.castBuffer = new byte[8];
this.castByteBuffer = ByteBuffer.wrap(castBuffer);
this.filled = 0;
}
public int read(byte[] b, int off, int len) throws IOException {
int remain = len;
while(remain > 0) {
int n = in.read(b, off, remain);
if(n <= 0) {
throw new EOFException();
}
remain -= n;
off += n;
}
return len;
}
public boolean tryRefer(BufferReferer ref, int size) throws IOException {
return false;
}
public byte readByte() throws IOException {
int n = in.read();
if(n < 0) {
throw new EOFException();
}
return (byte)n;
}
public void advance() {
filled = 0;
}
private void require(int len) throws IOException {
while(filled < len) {
int n = in.read(castBuffer, filled, len - filled);
if(n < 0) {
throw new EOFException();
}
filled += n;
}
}
public byte getByte() throws IOException {
require(1);
return castBuffer[0];
}
public short getShort() throws IOException {
require(2);
return castByteBuffer.getShort(0);
}
public int getInt() throws IOException {
require(4);
return castByteBuffer.getInt(0);
}
public long getLong() throws IOException {
require(8);
return castByteBuffer.getLong(0);
}
public float getFloat() throws IOException {
require(4);
return castByteBuffer.getFloat(0);
}
public double getDouble() throws IOException {
require(8);
return castByteBuffer.getDouble(0);
}
public void close() throws IOException {
in.close();
}
}