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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java | |
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Diffstat (limited to 'libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java')
-rw-r--r-- | libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java b/libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java new file mode 100644 index 000000000..1d73a05e5 --- /dev/null +++ b/libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java @@ -0,0 +1,178 @@ +/* FileCacheImageOutputStream.java -- + Copyright (C) 2004 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 javax.imageio.stream; + +import java.io.File; +import java.io.IOException; +import java.io.OutputStream; +import java.io.RandomAccessFile; + +/** + * @author Michael Koch (konqueror@gmx.de) + */ +public class FileCacheImageOutputStream extends ImageOutputStreamImpl +{ + private OutputStream stream; + private File cacheFile; + private RandomAccessFile cache; + private long maxPos; + + public FileCacheImageOutputStream(OutputStream s, File cacheDir) + throws IOException + { + stream = s; + cacheFile = File.createTempFile("imageio", ".tmp", cacheDir); + cache = new RandomAccessFile(cacheFile, "rw"); + maxPos = 0; + } + + public void close() + throws IOException + { + maxPos = cache.length(); + seek(maxPos); + flushBefore(maxPos); + super.close(); + cache.close(); + cacheFile.delete(); + stream.flush(); + stream = null; + } + + public boolean isCached() + { + return true; + } + + public boolean isCachedFile() + { + return true; + } + + public boolean isCachedMemory() + { + return false; + } + + public int read() + throws IOException + { + bitOffset = 0; + int val = cache.read(); + if (val != -1) + streamPos++; + return val; + } + + public int read(byte[] data, int offset, int len) + throws IOException + { + bitOffset = 0; + int num = cache.read(data, offset, len); + if (num != -1) + streamPos += num; + return num; + } + + public void write(byte[] data, int offset, int len) + throws IOException + { + flushBits(); + cache.write(data, offset, len); + streamPos += len; + maxPos = Math.max(streamPos, maxPos); + } + + public void write(int value) + throws IOException + { + flushBits(); + cache.write(value); + streamPos++; + maxPos = Math.max(streamPos, maxPos); + } + + public long length() + { + long l; + try + { + l = cache.length(); + } + catch (IOException ex) + { + l = -1; + } + return l; + } + + public void seek(long pos) + throws IOException + { + checkClosed(); + if (pos < flushedPos) + throw new IndexOutOfBoundsException(); + cache.seek(pos); + streamPos = cache.getFilePointer(); + maxPos = Math.max(streamPos, maxPos); + bitOffset = 0; + } + + public void flushBefore(long pos) + throws IOException + { + long oldPos = flushedPos; + super.flushBefore(pos); + long flushed = flushedPos - oldPos; + if (flushed > 0) + { + int len = 512; + byte[] buf = new byte[len]; + cache.seek(oldPos); + while (flushed > 0) + { + int l = (int) Math.min(flushed, len); + cache.readFully(buf, 0, l); + stream.write(buf, 0, l); + flushed -= l; + } + stream.flush(); + } + } +} |