/*
* Copyright 2016 Skynav, Inc. All rights reserved.
* Portions Copyright 2009 Extensible Formatting Systems, Inc (XFSI).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY SKYNAV, INC. AND ITS CONTRIBUTORS “AS IS” AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL SKYNAV, INC. OR ITS CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.xfsi.xav.validation.images.jpeg;
import java.io.EOFException;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import com.xfsi.xav.validation.images.jpeg.JpegValidator.MsgCode;
import com.xfsi.xav.validation.util.AbstractLoggingValidator;
/**
* validates DQT segment
*/
class SegmentParserFFDB extends SegmentParser {
boolean validate(JpegInputStream jis, JpegState js, AbstractLoggingValidator mh) throws EOFException
{
try
{
js.incrementTablesMiscSegmentCount();
int segmentBytesLeft = jis.readShort() & 0xffff;
mh.logResult(JpegValidator.MsgCode.JPG01I024, js.getCurrentCode(), segmentBytesLeft);
segmentBytesLeft -= 2;
int tableCount = 0;
List<Integer> validPq = new LinkedList<Integer>();
validPq.add(0);
validPq.add(1);
List<Integer> validTq = new LinkedList<Integer>();
validTq.add(0);
validTq.add(1);
validTq.add(2);
validTq.add(3);
while (segmentBytesLeft > 0)
{
byte b = jis.readByte();
segmentBytesLeft--;
int pQ = (b & 0xf0) >>> 4;
int tQ = (b & 0xf);
// TODO: further constraint pQ and tQ values by SOFn type (baseline, lossless, etc)
if (!validPq.contains(pQ))
mh.logResult(JpegValidator.MsgCode.JPG01E042, tableCount, pQ, validPq);
else
mh.logResult(JpegValidator.MsgCode.JPG01I025, tableCount, pQ);
if (!validTq.contains(tQ))
mh.logResult(JpegValidator.MsgCode.JPG01E043, tableCount, tQ, validTq);
else
mh.logResult(JpegValidator.MsgCode.JPG01I026, tableCount, tQ);
if (pQ == 0)
{
for (int k = 0; k < 64; k++)
{
if (jis.readByte() == 0)
mh.logResult(JpegValidator.MsgCode.JPG01E044, tableCount, k);
segmentBytesLeft--;
}
}
else
{
for (int k = 0; k < 64; k ++)
{
if (jis.readShort() == 0)
mh.logResult(JpegValidator.MsgCode.JPG01E044, tableCount, k);
segmentBytesLeft -= 2;
}
}
tableCount++;
}
}
catch (EOFException e)
{
mh.logResult(JpegValidator.MsgCode.JPG01F003, js.getCurrentCode(), js.getSegmentCount(), jis.getTotalBytesRead());
throw e;
}
catch (IOException e)
{
assert(false) : mh.msgFormatterNV(MsgCode.JPG01X003.toString(), Thread.currentThread().getStackTrace()[2].getMethodName(), e.getMessage());
}
return true;
}
}