| /* |
| * 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.InputStream; |
| |
| /** |
| * Provides an input stream wrapper that detects line feed sequences and |
| * replaces them by new ones. |
| * |
| */ |
| public class LineInputStream extends InputStream { |
| |
| 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 byte[] lineSpool; |
| |
| private int pos = 0; |
| |
| private int end = 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; |
| |
| boolean isEof = false; |
| |
| private byte[] spool; |
| |
| private int spoolPos = 0; |
| |
| private final InputStream in; |
| |
| public LineInputStream(InputStream in, byte[] ls) { |
| this.in = in; |
| if (ls != null) { |
| lineFeed = ls; |
| } |
| lineSpool = new byte[lineFeed.length + 1]; |
| System.arraycopy(lineFeed, 0, lineSpool, 0, lineFeed.length); |
| } |
| |
| private int fillBuffer() throws IOException { |
| int ret = in.read(buffer, end, buffer.length - end); |
| if (ret >= 0) { |
| end += ret; |
| } else { |
| isEof = true; |
| } |
| return ret; |
| } |
| |
| public int read() throws IOException { |
| final byte[] one = new byte[1]; |
| if (read(one) == -1) { |
| return -1; |
| } |
| return one[0]; |
| } |
| |
| public int read(byte b[], int off, int len) throws IOException { |
| if (isEof) { |
| if (spool == null) { |
| if (state != STATE_INIT) { |
| spool = lineFeed; |
| state = STATE_INIT; |
| } else { |
| return -1; |
| } |
| } |
| } |
| int total = 0; |
| while (total < len) { |
| if (spool != null) { |
| b[off+(total++)] = spool[spoolPos++]; |
| if (spoolPos == spool.length) { |
| spool = null; |
| spoolPos = 0; |
| } |
| } else { |
| if (pos == end) { |
| int ret = fillBuffer(); |
| if (ret == 0 && pos == end) { |
| // in this case we didn't get more, so flush |
| pos = end = 0; |
| continue; |
| } else if (ret == -1) { |
| break; |
| } |
| } |
| byte c = buffer[pos++]; |
| if (c == 0x0a) { |
| switch (state) { |
| case STATE_INIT: |
| state = STATE_LF; |
| break; |
| case STATE_CR: |
| state = STATE_CRLF; |
| break; |
| case STATE_LF: |
| spool = lineFeed; |
| break; |
| case STATE_CRLF: |
| spool = lineFeed; |
| state = STATE_LF; |
| } |
| } else if (c == 0x0d) { |
| switch (state) { |
| case STATE_INIT: |
| state = STATE_CR; |
| break; |
| case STATE_LF: |
| state = STATE_CRLF; |
| break; |
| case STATE_CR: |
| spool = lineFeed; |
| break; |
| case STATE_CRLF: |
| spool = lineFeed; |
| state = STATE_CR; |
| } |
| } else { |
| if (state != STATE_INIT) { |
| spool = lineSpool; |
| lineSpool[lineSpool.length - 1] = c; |
| state = STATE_INIT; |
| } else { |
| b[off + (total++)] = c; |
| } |
| } |
| } |
| } |
| return total; |
| } |
| |
| public void close() throws IOException { |
| in.close(); |
| } |
| |
| } |