diff options
Diffstat (limited to 'src/java/org/apache/fop/image/analyser/EMFReader.java')
| -rw-r--r-- | src/java/org/apache/fop/image/analyser/EMFReader.java | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/src/java/org/apache/fop/image/analyser/EMFReader.java b/src/java/org/apache/fop/image/analyser/EMFReader.java new file mode 100644 index 000000000..a5c01845f --- /dev/null +++ b/src/java/org/apache/fop/image/analyser/EMFReader.java @@ -0,0 +1,159 @@ +/*
+ * Copyright 1999-2005 The Apache Software Foundation.
+ *
+ * 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.
+ */
+
+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 EMF image type.
+ *
+ * @author Peter Herweg
+ */
+public class EMFReader implements ImageReader {
+
+ /** Length of the EMF header */
+ protected static final int EMF_SIG_LENGTH = 88;
+
+ /** offset to signature */
+ private static final int SIGNATURE_OFFSET = 40;
+ /** offset to width */
+ private static final int WIDTH_OFFSET = 32;
+ /** offset to height */
+ private static final int HEIGHT_OFFSET = 36;
+ /** offset to horizontal resolution in pixel */
+ private static final int HRES_PIXEL_OFFSET = 72;
+ /** offset to vertical resolution in pixel */
+ private static final int VRES_PIXEL_OFFSET = 76;
+ /** offset to horizontal resolution in mm */
+ private static final int HRES_MM_OFFSET = 80;
+ /** offset to vertical resolution in mm */
+ private static final int VRES_MM_OFFSET = 84;
+
+ /** @see org.apache.fop.image.analyser.ImageReader */
+ public FopImage.ImageInfo verifySignature(String uri, InputStream bis,
+ FOUserAgent ua) throws IOException {
+ byte[] header = getDefaultHeader(bis);
+ boolean supported =
+ ( (header[SIGNATURE_OFFSET + 0] == (byte) 0x20)
+ && (header[SIGNATURE_OFFSET + 1] == (byte) 0x45)
+ && (header[SIGNATURE_OFFSET + 2] == (byte) 0x4D)
+ && (header[SIGNATURE_OFFSET + 3] == (byte) 0x46) );
+
+ if (supported) {
+ FopImage.ImageInfo info = getDimension(header);
+ 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/emf";
+ }
+
+ private FopImage.ImageInfo getDimension(byte[] header) {
+ FopImage.ImageInfo info = new FopImage.ImageInfo();
+ long value = 0;
+ int byte1;
+ int byte2;
+ int byte3;
+ int byte4;
+
+ // little endian notation
+
+ //resolution
+ byte1 = header[HRES_MM_OFFSET] & 0xff;
+ byte2 = header[HRES_MM_OFFSET + 1] & 0xff;
+ byte3 = header[HRES_MM_OFFSET + 2] & 0xff;
+ byte4 = header[HRES_MM_OFFSET + 3] & 0xff;
+ long hresMM = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
+
+ byte1 = header[VRES_MM_OFFSET] & 0xff;
+ byte2 = header[VRES_MM_OFFSET + 1] & 0xff;
+ byte3 = header[VRES_MM_OFFSET + 2] & 0xff;
+ byte4 = header[VRES_MM_OFFSET + 3] & 0xff;
+ long vresMM = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
+
+ byte1 = header[HRES_PIXEL_OFFSET] & 0xff;
+ byte2 = header[HRES_PIXEL_OFFSET + 1] & 0xff;
+ byte3 = header[HRES_PIXEL_OFFSET + 2] & 0xff;
+ byte4 = header[HRES_PIXEL_OFFSET + 3] & 0xff;
+ long hresPixel = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
+
+ byte1 = header[VRES_PIXEL_OFFSET] & 0xff;
+ byte2 = header[VRES_PIXEL_OFFSET + 1] & 0xff;
+ byte3 = header[VRES_PIXEL_OFFSET + 2] & 0xff;
+ byte4 = header[VRES_PIXEL_OFFSET + 3] & 0xff;
+ long vresPixel = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
+
+ info.dpiHorizontal = hresPixel / (hresMM/25.4);
+ info.dpiVertical = vresPixel / (vresMM/25.4);;
+
+ //width
+ byte1 = header[WIDTH_OFFSET] & 0xff;
+ byte2 = header[WIDTH_OFFSET + 1] & 0xff;
+ byte3 = header[WIDTH_OFFSET + 2] & 0xff;
+ byte4 = header[WIDTH_OFFSET + 3] & 0xff;
+ value = (long) ((byte4 << 24) | (byte3 << 16)
+ | (byte2 << 8) | byte1);
+ value = (long) (value / 100f / 25.4 * info.dpiHorizontal);
+ info.width = (int) (value & 0xffffffff);
+
+ //height
+ byte1 = header[HEIGHT_OFFSET] & 0xff;
+ byte2 = header[HEIGHT_OFFSET + 1] & 0xff;
+ byte3 = header[HEIGHT_OFFSET + 2] & 0xff;
+ byte4 = header[HEIGHT_OFFSET + 3] & 0xff;
+ value = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
+ value = (long) (value / 100f / 25.4 * info.dpiVertical);
+ info.height = (int) (value & 0xffffffff);
+
+ return info;
+ }
+
+ private byte[] getDefaultHeader(InputStream imageStream)
+ throws IOException {
+ byte[] header = new byte[EMF_SIG_LENGTH];
+ try {
+ imageStream.mark(EMF_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;
+ }
+}
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