| /* |
| * 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.jackrabbit.vault.util; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * Provides an output stream wrapper that detects line feed sequences and |
| * replaces them by new ones. |
| * |
| */ |
| public class LineOutputStream extends OutputStream { |
| |
| public static final byte[] LS_BINARY = null; |
| |
| public static final byte[] LS_UNIX = new byte[]{0x0a}; |
| |
| public static final byte[] LS_WINDOWS = new byte[]{0x0d, 0x0a}; |
| |
| public static final byte[] LS_NATIVE = System.getProperty("line.separator").getBytes(); |
| |
| private byte[] buffer = new byte[8192]; |
| |
| private byte[] lineFeed = LS_NATIVE; |
| |
| private int pos = 0; |
| |
| private static final char STATE_INIT = ' '; |
| private static final char STATE_CR = 'c'; |
| private static final char STATE_LF = 'l'; |
| private static final char STATE_CRLF = 'f'; |
| |
| private char state = STATE_INIT; |
| |
| private final OutputStream out; |
| |
| public LineOutputStream(OutputStream out, byte[] ls) { |
| this.out = out; |
| if (ls != null) { |
| this.lineFeed = ls; |
| } |
| } |
| |
| public void write(int b) throws IOException { |
| if (b == 0x0a) { |
| switch (state) { |
| case STATE_INIT: |
| state = STATE_LF; |
| break; |
| case STATE_CR: |
| state = STATE_CRLF; |
| break; |
| case STATE_LF: |
| flush(true); |
| state = STATE_LF; |
| break; |
| case STATE_CRLF: |
| flush(true); |
| state = STATE_LF; |
| } |
| } else if (b == 0x0d) { |
| switch (state) { |
| case STATE_INIT: |
| state = STATE_CR; |
| break; |
| case STATE_LF: |
| state = STATE_CRLF; |
| break; |
| case STATE_CR: |
| flush(true); |
| state = STATE_CR; |
| break; |
| case STATE_CRLF: |
| flush(true); |
| state = STATE_CR; |
| } |
| } else { |
| if (state != STATE_INIT) { |
| flush(true); |
| state = STATE_INIT; |
| } |
| if (pos == buffer.length) { |
| flush(); |
| } |
| buffer[pos++] = (byte) (b & 0xff); |
| } |
| } |
| |
| public void flush(boolean addLF) throws IOException { |
| flush(); |
| if (addLF) { |
| out.write(lineFeed); |
| } |
| out.flush(); |
| } |
| |
| public void flush() throws IOException { |
| out.write(buffer, 0, pos); |
| pos = 0; |
| out.flush(); |
| } |
| |
| public void close() throws IOException { |
| // check for pending lfs |
| flush(state != STATE_INIT); |
| out.close(); |
| } |
| |
| } |