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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.ico;
import com.drew.lang.SequentialReader;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Metadata;
import java.io.IOException;
/**
* Reads ICO (Windows Icon) file metadata.
* <ul>
* <li>https://en.wikipedia.org/wiki/ICO_(file_format)</li>
* </ul>
*
* @author Drew Noakes https://drewnoakes.com
*/
public class IcoReader
{
public void extract(@NotNull final SequentialReader reader, @NotNull final Metadata metadata)
{
reader.setMotorolaByteOrder(false);
int type;
int imageCount;
// Read header (ICONDIR structure)
try {
int reserved = reader.getUInt16();
if (reserved != 0) {
IcoDirectory directory = new IcoDirectory();
directory.addError("Invalid header bytes");
metadata.addDirectory(directory);
return;
}
type = reader.getUInt16();
if (type != 1 && type != 2) {
IcoDirectory directory = new IcoDirectory();
directory.addError("Invalid type " + type + " -- expecting 1 or 2");
metadata.addDirectory(directory);
return;
}
imageCount = reader.getUInt16();
if (imageCount == 0) {
IcoDirectory directory = new IcoDirectory();
directory.addError("Image count cannot be zero");
metadata.addDirectory(directory);
return;
}
} catch (IOException ex) {
IcoDirectory directory = new IcoDirectory();
directory.addError("Exception reading ICO file metadata: " + ex.getMessage());
metadata.addDirectory(directory);
return;
}
// Read each embedded image
for (int imageIndex = 0; imageIndex < imageCount; imageIndex++) {
IcoDirectory directory = new IcoDirectory();
try {
directory.setInt(IcoDirectory.TAG_IMAGE_TYPE, type);
directory.setInt(IcoDirectory.TAG_IMAGE_WIDTH, reader.getUInt8());
directory.setInt(IcoDirectory.TAG_IMAGE_HEIGHT, reader.getUInt8());
directory.setInt(IcoDirectory.TAG_COLOUR_PALETTE_SIZE, reader.getUInt8());
// Ignore this byte (normally zero, though .NET's System.Drawing.Icon.Save method writes 255)
reader.getUInt8();
if (type == 1) {
// Icon
directory.setInt(IcoDirectory.TAG_COLOUR_PLANES, reader.getUInt16());
directory.setInt(IcoDirectory.TAG_BITS_PER_PIXEL, reader.getUInt16());
} else {
// Cursor
directory.setInt(IcoDirectory.TAG_CURSOR_HOTSPOT_X, reader.getUInt16());
directory.setInt(IcoDirectory.TAG_CURSOR_HOTSPOT_Y, reader.getUInt16());
}
directory.setLong(IcoDirectory.TAG_IMAGE_SIZE_BYTES, reader.getUInt32());
directory.setLong(IcoDirectory.TAG_IMAGE_OFFSET_BYTES, reader.getUInt32());
} catch (IOException ex) {
directory.addError("Exception reading ICO file metadata: " + ex.getMessage());
}
metadata.addDirectory(directory);
}
}
}
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