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/*
* Copyright 2002-2017 Drew Noakes
*
* Licensed 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.
*
* More information about this project is available at:
*
* https://drewnoakes.com/code/exif/
* https://github.com/drewnoakes/metadata-extractor
*/
package com.drew.metadata.pcx;
import com.drew.imaging.ImageProcessingException;
import com.drew.lang.SequentialReader;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Metadata;
/**
* Reads PCX image file metadata.
*
* <ul>
* <li>https://courses.engr.illinois.edu/ece390/books/labmanual/graphics-pcx.html</li>
* <li>http://www.fileformat.info/format/pcx/egff.htm</li>
* <li>http://fileformats.archiveteam.org/wiki/PCX</li>
* </ul>
*
* @author Drew Noakes https://drewnoakes.com
*/
public class PcxReader
{
public void extract(@NotNull final SequentialReader reader, @NotNull final Metadata metadata)
{
reader.setMotorolaByteOrder(false);
PcxDirectory directory = new PcxDirectory();
metadata.addDirectory(directory);
try {
byte identifier = reader.getInt8();
if (identifier != 0x0A)
throw new ImageProcessingException("Invalid PCX identifier byte");
directory.setInt(PcxDirectory.TAG_VERSION, reader.getInt8());
byte encoding = reader.getInt8();
if (encoding != 0x01)
throw new ImageProcessingException("Invalid PCX encoding byte");
directory.setInt(PcxDirectory.TAG_BITS_PER_PIXEL, reader.getUInt8());
directory.setInt(PcxDirectory.TAG_XMIN, reader.getUInt16());
directory.setInt(PcxDirectory.TAG_YMIN, reader.getUInt16());
directory.setInt(PcxDirectory.TAG_XMAX, reader.getUInt16());
directory.setInt(PcxDirectory.TAG_YMAX, reader.getUInt16());
directory.setInt(PcxDirectory.TAG_HORIZONTAL_DPI, reader.getUInt16());
directory.setInt(PcxDirectory.TAG_VERTICAL_DPI, reader.getUInt16());
directory.setByteArray(PcxDirectory.TAG_PALETTE, reader.getBytes(48));
reader.skip(1);
directory.setInt(PcxDirectory.TAG_COLOR_PLANES, reader.getUInt8());
directory.setInt(PcxDirectory.TAG_BYTES_PER_LINE, reader.getUInt16());
int paletteType = reader.getUInt16();
if (paletteType != 0)
directory.setInt(PcxDirectory.TAG_PALETTE_TYPE, paletteType);
int hScrSize = reader.getUInt16();
if (hScrSize != 0)
directory.setInt(PcxDirectory.TAG_HSCR_SIZE, hScrSize);
int vScrSize = reader.getUInt16();
if (vScrSize != 0)
directory.setInt(PcxDirectory.TAG_VSCR_SIZE, vScrSize);
} catch (Exception ex) {
directory.addError("Exception reading PCX file metadata: " + ex.getMessage());
}
}
}
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