| /* |
| * 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 |
| * |
| * https://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.avro.io; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.Buffer; |
| import java.nio.ByteBuffer; |
| |
| import org.apache.avro.InvalidNumberEncodingException; |
| import org.apache.avro.util.ByteBufferInputStream; |
| |
| /** |
| * A non-buffering version of {@link BinaryDecoder}. |
| * <p/> |
| * This implementation will not read-ahead from the provided InputStream beyond |
| * the minimum required to service the API requests. |
| * |
| * @see Encoder |
| */ |
| |
| class DirectBinaryDecoder extends BinaryDecoder { |
| private InputStream in; |
| |
| private class ByteReader { |
| public ByteBuffer read(ByteBuffer old, int length) throws IOException { |
| ByteBuffer result; |
| if (old != null && length <= old.capacity()) { |
| result = old; |
| ((Buffer) result).clear(); |
| } else { |
| result = ByteBuffer.allocate(length); |
| } |
| doReadBytes(result.array(), result.position(), length); |
| ((Buffer) result).limit(length); |
| return result; |
| } |
| } |
| |
| private class ReuseByteReader extends ByteReader { |
| private final ByteBufferInputStream bbi; |
| |
| public ReuseByteReader(ByteBufferInputStream bbi) { |
| this.bbi = bbi; |
| } |
| |
| @Override |
| public ByteBuffer read(ByteBuffer old, int length) throws IOException { |
| if (old != null) { |
| return super.read(old, length); |
| } else { |
| return bbi.readBuffer(length); |
| } |
| } |
| |
| } |
| |
| private ByteReader byteReader; |
| |
| DirectBinaryDecoder(InputStream in) { |
| super(); |
| configure(in); |
| } |
| |
| DirectBinaryDecoder configure(InputStream in) { |
| this.in = in; |
| byteReader = (in instanceof ByteBufferInputStream) ? new ReuseByteReader((ByteBufferInputStream) in) |
| : new ByteReader(); |
| return this; |
| } |
| |
| @Override |
| public boolean readBoolean() throws IOException { |
| int n = in.read(); |
| if (n < 0) { |
| throw new EOFException(); |
| } |
| return n == 1; |
| } |
| |
| @Override |
| public int readInt() throws IOException { |
| int n = 0; |
| int b; |
| int shift = 0; |
| do { |
| b = in.read(); |
| if (b >= 0) { |
| n |= (b & 0x7F) << shift; |
| if ((b & 0x80) == 0) { |
| return (n >>> 1) ^ -(n & 1); // back to two's-complement |
| } |
| } else { |
| throw new EOFException(); |
| } |
| shift += 7; |
| } while (shift < 32); |
| throw new InvalidNumberEncodingException("Invalid int encoding"); |
| |
| } |
| |
| @Override |
| public long readLong() throws IOException { |
| long n = 0; |
| int b; |
| int shift = 0; |
| do { |
| b = in.read(); |
| if (b >= 0) { |
| n |= (b & 0x7FL) << shift; |
| if ((b & 0x80) == 0) { |
| return (n >>> 1) ^ -(n & 1); // back to two's-complement |
| } |
| } else { |
| throw new EOFException(); |
| } |
| shift += 7; |
| } while (shift < 64); |
| throw new InvalidNumberEncodingException("Invalid long encoding"); |
| } |
| |
| private final byte[] buf = new byte[8]; |
| |
| @Override |
| public float readFloat() throws IOException { |
| doReadBytes(buf, 0, 4); |
| int n = (((int) buf[0]) & 0xff) | ((((int) buf[1]) & 0xff) << 8) | ((((int) buf[2]) & 0xff) << 16) |
| | ((((int) buf[3]) & 0xff) << 24); |
| return Float.intBitsToFloat(n); |
| } |
| |
| @Override |
| public double readDouble() throws IOException { |
| doReadBytes(buf, 0, 8); |
| long n = (((long) buf[0]) & 0xff) | ((((long) buf[1]) & 0xff) << 8) | ((((long) buf[2]) & 0xff) << 16) |
| | ((((long) buf[3]) & 0xff) << 24) | ((((long) buf[4]) & 0xff) << 32) | ((((long) buf[5]) & 0xff) << 40) |
| | ((((long) buf[6]) & 0xff) << 48) | ((((long) buf[7]) & 0xff) << 56); |
| return Double.longBitsToDouble(n); |
| } |
| |
| @Override |
| public ByteBuffer readBytes(ByteBuffer old) throws IOException { |
| int length = readInt(); |
| return byteReader.read(old, length); |
| } |
| |
| @Override |
| protected void doSkipBytes(long length) throws IOException { |
| while (length > 0) { |
| long n = in.skip(length); |
| if (n <= 0) { |
| throw new EOFException(); |
| } |
| length -= n; |
| } |
| } |
| |
| @Override |
| protected void doReadBytes(byte[] bytes, int start, int length) throws IOException { |
| for (;;) { |
| int n = in.read(bytes, start, length); |
| if (n == length || length == 0) { |
| return; |
| } else if (n < 0) { |
| throw new EOFException(); |
| } |
| start += n; |
| length -= n; |
| } |
| } |
| |
| @Override |
| public InputStream inputStream() { |
| return in; |
| } |
| |
| @Override |
| public boolean isEnd() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| } |