/*
* Copyright (c) 1998-2007 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Sam
*/
package com.caucho.quercus.lib.file;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.StringValue;
import java.io.IOException;
/**
* A helper class that handles line endings when reading from a BinaryInput.
*/
public class LineReader
{
private Boolean _isMacLineEnding;
public LineReader(Env env)
{
this(FileModule.INI_AUTO_DETECT_LINE_ENDINGS.getAsBoolean(env));
}
private LineReader(boolean isAutoDetectLineEndings)
{
if (!isAutoDetectLineEndings)
_isMacLineEnding = Boolean.FALSE;
}
/**
* Reads a line from the BinaryInput, returning null on EOF.
*/
public StringValue readLine(Env env, BinaryInput input, long length)
throws IOException
{
StringValue sb = env.createBinaryBuilder();
int ch;
for (; length > 0 && (ch = input.read()) >= 0; length--) {
// php/161[pq] newlines
if (ch == '\n') {
sb.appendByte((byte) ch);
if (_isMacLineEnding == null)
_isMacLineEnding = false;
if (!_isMacLineEnding)
break;
}
else if (ch == '\r') {
sb.appendByte((byte) '\r');
int ch2 = input.read();
if (ch2 == '\n') {
if (_isMacLineEnding == null)
_isMacLineEnding = false;
if (_isMacLineEnding) {
input.unread();
break;
}
else {
sb.appendByte((byte) '\n');
break;
}
}
else {
input.unread();
if (_isMacLineEnding == null)
_isMacLineEnding = true;
if (_isMacLineEnding)
return sb;
}
}
else
sb.appendByte((byte) ch);
}
if (sb.length() == 0)
return null;
else
return sb;
}
}