| /* |
| * 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.giraph.utils; |
| |
| import java.io.DataInput; |
| import java.io.IOException; |
| import java.io.UTFDataFormatException; |
| import io.netty.buffer.ByteBuf; |
| |
| /** |
| * Special input that reads from a DynamicChannelBuffer. |
| */ |
| public class DynamicChannelBufferInputStream implements DataInput { |
| /** Internal dynamic channel buffer */ |
| private ByteBuf buffer; |
| |
| /** |
| * Constructor. |
| * |
| * @param buffer Buffer to read from |
| */ |
| public DynamicChannelBufferInputStream(ByteBuf buffer) { |
| this.buffer = buffer; |
| } |
| |
| @Override |
| public void readFully(byte[] b) throws IOException { |
| buffer.readBytes(b); |
| } |
| |
| @Override |
| public void readFully(byte[] b, int off, int len) throws IOException { |
| buffer.readBytes(b, off, len); |
| } |
| |
| @Override |
| public int skipBytes(int n) throws IOException { |
| buffer.skipBytes(n); |
| return n; |
| } |
| |
| @Override |
| public boolean readBoolean() throws IOException { |
| int ch = buffer.readByte(); |
| if (ch < 0) { |
| throw new IllegalStateException("readBoolean: Got " + ch); |
| } |
| return ch != 0; |
| } |
| |
| @Override |
| public byte readByte() throws IOException { |
| return buffer.readByte(); |
| } |
| |
| @Override |
| public int readUnsignedByte() throws IOException { |
| return buffer.readUnsignedByte(); |
| } |
| |
| @Override |
| public short readShort() throws IOException { |
| return buffer.readShort(); |
| } |
| |
| @Override |
| public int readUnsignedShort() throws IOException { |
| return buffer.readUnsignedShort(); |
| } |
| |
| @Override |
| public char readChar() throws IOException { |
| return buffer.readChar(); |
| } |
| |
| @Override |
| public int readInt() throws IOException { |
| return buffer.readInt(); |
| } |
| |
| @Override |
| public long readLong() throws IOException { |
| return buffer.readLong(); |
| } |
| |
| @Override |
| public float readFloat() throws IOException { |
| return buffer.readFloat(); |
| } |
| |
| @Override |
| public double readDouble() throws IOException { |
| return buffer.readDouble(); |
| } |
| |
| @Override |
| public String readLine() throws IOException { |
| // Note that this code is mostly copied from DataInputStream |
| char[] buf = new char[128]; |
| |
| int room = buf.length; |
| int offset = 0; |
| int c; |
| |
| loop: |
| while (true) { |
| c = buffer.readByte(); |
| switch (c) { |
| case -1: |
| case '\n': |
| break loop; |
| case '\r': |
| int c2 = buffer.readByte(); |
| if ((c2 != '\n') && (c2 != -1)) { |
| buffer.readerIndex(buffer.readerIndex() - 1); |
| } |
| break loop; |
| default: |
| if (--room < 0) { |
| char[] replacebuf = new char[offset + 128]; |
| room = replacebuf.length - offset - 1; |
| System.arraycopy(buf, 0, replacebuf, 0, offset); |
| buf = replacebuf; |
| } |
| buf[offset++] = (char) c; |
| break; |
| } |
| } |
| if ((c == -1) && (offset == 0)) { |
| return null; |
| } |
| return String.copyValueOf(buf, 0, offset); |
| } |
| |
| @Override |
| public String readUTF() throws IOException { |
| // Note that this code is mostly copied from DataInputStream |
| int utflen = buffer.readUnsignedShort(); |
| |
| byte[] bytearr = new byte[utflen]; |
| char[] chararr = new char[utflen]; |
| |
| int c; |
| int char2; |
| int char3; |
| int count = 0; |
| int chararrCount = 0; |
| |
| buffer.readBytes(bytearr, 0, utflen); |
| |
| while (count < utflen) { |
| c = (int) bytearr[count] & 0xff; |
| if (c > 127) { |
| break; |
| } |
| count++; |
| chararr[chararrCount++] = (char) c; |
| } |
| |
| while (count < utflen) { |
| c = (int) bytearr[count] & 0xff; |
| switch (c >> 4) { |
| case 0: |
| case 1: |
| case 2: |
| case 3: |
| case 4: |
| case 5: |
| case 6: |
| case 7: |
| /* 0xxxxxxx */ |
| count++; |
| chararr[chararrCount++] = (char) c; |
| break; |
| case 12: |
| case 13: |
| /* 110x xxxx 10xx xxxx*/ |
| count += 2; |
| if (count > utflen) { |
| throw new UTFDataFormatException( |
| "malformed input: partial character at end"); |
| } |
| char2 = (int) bytearr[count - 1]; |
| if ((char2 & 0xC0) != 0x80) { |
| throw new UTFDataFormatException( |
| "malformed input around byte " + count); |
| } |
| chararr[chararrCount++] = (char) (((c & 0x1F) << 6) | |
| (char2 & 0x3F)); |
| break; |
| case 14: |
| /* 1110 xxxx 10xx xxxx 10xx xxxx */ |
| count += 3; |
| if (count > utflen) { |
| throw new UTFDataFormatException( |
| "malformed input: partial character at end"); |
| } |
| char2 = (int) bytearr[count - 2]; |
| char3 = (int) bytearr[count - 1]; |
| if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80)) { |
| throw new UTFDataFormatException( |
| "malformed input around byte " + (count - 1)); |
| } |
| chararr[chararrCount++] = (char) (((c & 0x0F) << 12) | |
| ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0)); |
| break; |
| default: |
| /* 10xx xxxx, 1111 xxxx */ |
| throw new UTFDataFormatException( |
| "malformed input around byte " + count); |
| } |
| } |
| // The number of chars produced may be less than utflen |
| return new String(chararr, 0, chararrCount); |
| } |
| } |