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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.solr.common.util;
import java.io.*;
/** Single threaded buffered InputStream
* Internal Solr use only, subject to change.
*/
public class FastInputStream extends DataInputInputStream {
protected final InputStream in;
protected final byte[] buf;
protected int pos;
protected int end;
protected long readFromStream; // number of bytes read from the underlying inputstream
public FastInputStream(InputStream in) {
// use default BUFSIZE of BufferedOutputStream so if we wrap that
// it won't cause double buffering.
this(in, new byte[8192], 0, 0);
}
public FastInputStream(InputStream in, byte[] tempBuffer, int start, int end) {
this.in = in;
this.buf = tempBuffer;
this.pos = start;
this.end = end;
}
public static FastInputStream wrap(InputStream in) {
return (in instanceof FastInputStream) ? (FastInputStream)in : new FastInputStream(in);
}
@Override
public int read() throws IOException {
if (pos >= end) {
refill();
if (pos >= end) return -1;
}
return buf[pos++] & 0xff;
}
public int peek() throws IOException {
if (pos >= end) {
refill();
if (pos >= end) return -1;
}
return buf[pos] & 0xff;
}
@Override
public int readUnsignedByte() throws IOException {
if (pos >= end) {
refill();
if (pos >= end) {
throw new EOFException();
}
}
return buf[pos++] & 0xff;
}
public int readWrappedStream(byte[] target, int offset, int len) throws IOException {
return in.read(target, offset, len);
}
public long position() {
return readFromStream - (end - pos);
}
public void refill() throws IOException {
// this will set end to -1 at EOF
end = readWrappedStream(buf, 0, buf.length);
if (end > 0) readFromStream += end;
pos = 0;
}
@Override
public int available() throws IOException {
return end - pos;
}
/** Returns the internal buffer used for caching */
public byte[] getBuffer() {
return buf;
}
/** Current position within the internal buffer */
public int getPositionInBuffer() {
return pos;
}
/** Current end-of-data position within the internal buffer. This is one past the last valid byte. */
public int getEndInBuffer() {
return end;
}
@Override
public int read(byte b[], int off, int len) throws IOException {
int r=0; // number of bytes we have read
// first read from our buffer;
if (end-pos > 0) {
r = Math.min(end-pos, len);
System.arraycopy(buf, pos, b, off, r);
pos += r;
}
if (r == len) return r;
// amount left to read is >= buffer size
if (len-r >= buf.length) {
int ret = readWrappedStream(b, off+r, len-r);
if (ret >= 0) {
readFromStream += ret;
r += ret;
return r;
} else {
// negative return code
return r > 0 ? r : -1;
}
}
refill();
// read rest from our buffer
if (end-pos > 0) {
int toRead = Math.min(end-pos, len-r);
System.arraycopy(buf, pos, b, off+r, toRead);
pos += toRead;
r += toRead;
return r;
}
return r > 0 ? r : -1;
}
@Override
public void close() throws IOException {
in.close();
}
@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 {
while (len>0) {
int ret = read(b, off, len);
if (ret==-1) {
throw new EOFException();
}
off += ret;
len -= ret;
}
}
@Override
public int skipBytes(int n) throws IOException {
if (end-pos >= n) {
pos += n;
return n;
}
if (end-pos<0) return -1;
int r = end-pos;
pos = end;
while (r < n) {
refill();
if (end-pos <= 0) return r;
int toRead = Math.min(end-pos, n-r);
r += toRead;
pos += toRead;
}
return r;
}
@Override
public boolean readBoolean() throws IOException {
return readByte()==1;
}
@Override
public byte readByte() throws IOException {
if (pos >= end) {
refill();
if (pos >= end) throw new EOFException();
}
return buf[pos++];
}
@Override
public short readShort() throws IOException {
return (short)((readUnsignedByte() << 8) | readUnsignedByte());
}
@Override
public int readUnsignedShort() throws IOException {
return (readUnsignedByte() << 8) | readUnsignedByte();
}
@Override
public char readChar() throws IOException {
return (char)((readUnsignedByte() << 8) | readUnsignedByte());
}
@Override
public int readInt() throws IOException {
return ((readUnsignedByte() << 24)
|(readUnsignedByte() << 16)
|(readUnsignedByte() << 8)
| readUnsignedByte());
}
@Override
public long readLong() throws IOException {
return (((long)readUnsignedByte()) << 56)
| (((long)readUnsignedByte()) << 48)
| (((long)readUnsignedByte()) << 40)
| (((long)readUnsignedByte()) << 32)
| (((long)readUnsignedByte()) << 24)
| (readUnsignedByte() << 16)
| (readUnsignedByte() << 8)
| (readUnsignedByte());
}
@Override
public float readFloat() throws IOException {
return Float.intBitsToFloat(readInt());
}
@Override
public double readDouble() throws IOException {
return Double.longBitsToDouble(readLong());
}
@Override
public String readLine() throws IOException {
throw new UnsupportedOperationException();
}
@Override
public String readUTF() throws IOException {
return new DataInputStream(this).readUTF();
}
}
