diff options
Diffstat (limited to 'src/java/org/apache/fop/image/analyser/PNGReader.java')
-rw-r--r-- | src/java/org/apache/fop/image/analyser/PNGReader.java | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/src/java/org/apache/fop/image/analyser/PNGReader.java b/src/java/org/apache/fop/image/analyser/PNGReader.java deleted file mode 100644 index ab6c64775..000000000 --- a/src/java/org/apache/fop/image/analyser/PNGReader.java +++ /dev/null @@ -1,115 +0,0 @@ -/* - * 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. - */ - -/* $Id$ */ - -package org.apache.fop.image.analyser; - -// Java -import java.io.InputStream; -import java.io.IOException; - -// FOP -import org.apache.fop.image.FopImage; -import org.apache.fop.apps.FOUserAgent; - -/** - * ImageReader object for PNG image type. - * - * @author Pankaj Narula - * @version $Id$ - */ -public class PNGReader implements ImageReader { - - private static final int PNG_SIG_LENGTH = 24; - - /** {@inheritDoc} */ - public FopImage.ImageInfo verifySignature(String uri, InputStream bis, - FOUserAgent ua) throws IOException { - byte[] header = getDefaultHeader(bis); - boolean supported = ((header[0] == (byte) 0x89) - && (header[1] == (byte) 0x50) - && (header[2] == (byte) 0x4e) - && (header[3] == (byte) 0x47) - && (header[4] == (byte) 0x0d) - && (header[5] == (byte) 0x0a) - && (header[6] == (byte) 0x1a) - && (header[7] == (byte) 0x0a)); - - if (supported) { - FopImage.ImageInfo info = new FopImage.ImageInfo(); - info.dpiHorizontal = ua.getFactory().getSourceResolution(); - info.dpiVertical = info.dpiHorizontal; - - getDimension(header, info); - info.originalURI = uri; - info.mimeType = getMimeType(); - info.inputStream = bis; - return info; - } else { - return null; - } - } - - /** - * Returns the MIME type supported by this implementation. - * - * @return The MIME type - */ - public String getMimeType() { - return "image/png"; - } - - private void getDimension(byte[] header, FopImage.ImageInfo info) { - // png is always big endian - int byte1 = header[16] & 0xff; - int byte2 = header[17] & 0xff; - int byte3 = header[18] & 0xff; - int byte4 = header[19] & 0xff; - long l = (long) ((byte1 << 24) - | (byte2 << 16) - | (byte3 << 8) - | (byte4)); - info.width = (int) l; - - byte1 = header[20] & 0xff; - byte2 = header[21] & 0xff; - byte3 = header[22] & 0xff; - byte4 = header[23] & 0xff; - l = (long) ((byte1 << 24) | (byte2 << 16) | (byte3 << 8) | byte4); - info.height = (int) l; - } - - private byte[] getDefaultHeader(InputStream imageStream) - throws IOException { - byte[] header = new byte[PNG_SIG_LENGTH]; - try { - imageStream.mark(PNG_SIG_LENGTH + 1); - imageStream.read(header); - imageStream.reset(); - } catch (IOException ex) { - try { - imageStream.reset(); - } catch (IOException exbis) { - // throw the original exception, not this one - } - throw ex; - } - return header; - } - -} |