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Diffstat (limited to 'libjava/classpath/gnu/java/awt/font/opentype/MacResourceFork.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/font/opentype/MacResourceFork.java | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/font/opentype/MacResourceFork.java b/libjava/classpath/gnu/java/awt/font/opentype/MacResourceFork.java new file mode 100644 index 00000000000..8115e0403ef --- /dev/null +++ b/libjava/classpath/gnu/java/awt/font/opentype/MacResourceFork.java @@ -0,0 +1,235 @@ +/* MacResourceFork.java -- Parses MacOS resource forks. + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.awt.font.opentype; + +import java.nio.ByteBuffer; + + +/** + * A class for accessing data that is stored in the resource fork of + * Macintosh files. Writing resource forks is currently not supported. + * + * <p>The gnu.java.awt.font package uses this class for accessing + * fonts in the MacOS X ".dfont" format, which is is a file in the + * format of a Macintosh resource fork, but stored in the normal data + * fork of the file. + * + * <p>The implementation has been designed to work efficiently with + * the virtual memory subsystem. It is recommended to pass an + * instance of {@link java.nio.MappedByteBuffer} to the constructor. + * + * <p>Thread Safety: All access is synchronized on the ByteBuffer + * that is passed to the constructor. + * + * @see <a href= + * "http://developer.apple.com/documentation/mac/MoreToolbox/MoreToolbox-99.html" + * >Apple’ developer documentation about the Resource File + * Format</a> + * + * @author Sascha Brawer (brawer@dandelis.ch) + */ +final class MacResourceFork +{ + int[] types; + Resource[][] resources; + ByteBuffer buf; + + public MacResourceFork(ByteBuffer buf) + { + int typeListOffset; + int refListOffset; + int nameListOffset; + int mapOffset, mapLen; + int dataOffset, dataLen; + int numTypes; + + synchronized (buf) + { + buf = buf.duplicate(); + this.buf = buf; + buf.position(0); + dataOffset = buf.getInt(); + mapOffset = buf.getInt(); + dataLen = buf.getInt(); + mapLen = buf.getInt(); + buf.position(mapOffset + 24); + refListOffset = mapOffset + buf.getChar(); + nameListOffset = mapOffset + buf.getChar(); + numTypes = buf.getChar() + 1; + types = new int[numTypes]; + resources = new Resource[numTypes][]; + + /* Parse resource type list. */ + typeListOffset = buf.position(); + for (int i = 0; i < numTypes; i++) + { + buf.position(typeListOffset + 8 * i); + int resType = buf.getInt(); + int numRes = buf.getChar() + 1; + + types[i] = resType; + resources[i] = new Resource[numRes]; + + buf.position(refListOffset + buf.getChar()); + for (int j = 0; j < numRes; j++) + { + short resID = buf.getShort(); + int resNameOffset = nameListOffset + buf.getChar(); + int resDataOffset = buf.getInt(); + byte resAttr = (byte) (resDataOffset >> 24); + resDataOffset = dataOffset + (resDataOffset & 0x00ffffff); + buf.getInt(); /* skip four reserved bytes */ + + Resource rsrc = new Resource(buf, resType, resID, resDataOffset, + resNameOffset); + resources[i][j] = rsrc; + } + } + } + } + + + public Resource[] getResources(int type) + { + synchronized (buf) + { + for (int i = 0; i < types.length; i++) + { + if (types[i] == type) + return resources[i]; + } + } + return null; + } + + + public Resource getResource(int type, short id) + { + Resource[] res; + + synchronized (buf) + { + for (int i = 0; i < types.length; i++) + { + if (types[i] != type) + continue; + + res = resources[i]; + for (int j = 0; j < res.length; j++) + if (res[j].getID() == id) + return res[j]; + } + } + + return null; + } + + + /** + * A single resource that is contained in a resource fork. + */ + public static final class Resource + { + int type; + short id; + byte attribute; + int nameOffset; + int dataOffset; + ByteBuffer buf; + + private Resource(ByteBuffer buf, + int type, short id, int dataOffset, int nameOffset) + { + this.buf = buf; + this.type = type; + this.id = id; + this.dataOffset = dataOffset; + this.nameOffset = nameOffset; + } + + + /** + * Returns the type of this resource. + * + * @return an <code>int</code> encoding a four-byte type tag, + * such as <code>0x464f4e54</code> for <code>'FONT'</code>. + */ + public int getType() + { + return type; + } + + + /** + * Returns the ID of this resource. + */ + public short getID() + { + return id; + } + + + /** + * Retrieves the content of the resource. Only one page of memory + * is touched, irrespective of the actual size of the resource. + */ + public ByteBuffer getContent() + { + synchronized (buf) + { + buf.limit(buf.capacity()); + int len = buf.getInt(dataOffset); + buf.position(dataOffset + 4).limit(dataOffset + 4 + len); + return buf.slice(); + } + } + + + /** + * Determines the length of the resource in bytes. + */ + public int getLength() + { + synchronized (buf) + { + return buf.getInt(dataOffset); + } + } + } +} |