replicant-frameworks_native/awt/javax/imageio/stream/FileImageInputStream.java
2009-03-03 19:31:44 -08:00

123 lines
3.2 KiB
Java

/*
* 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.
*/
package javax.imageio.stream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.File;
import java.io.FileNotFoundException;
/**
* The FileImageInputStream class implements ImageInputStream and obtains its
* input data from a File or RandomAccessFile.
*
* @since Android 1.0
*/
public class FileImageInputStream extends ImageInputStreamImpl {
/**
* The raf.
*/
RandomAccessFile raf;
/**
* Instantiates a new FileImageInputStream from the specified File.
*
* @param f
* the File of input data.
* @throws FileNotFoundException
* if the specified file doesn't exist.
* @throws IOException
* if an I/O exception has occurred.
*/
@SuppressWarnings( {
"DuplicateThrows"
})
public FileImageInputStream(File f) throws FileNotFoundException, IOException {
if (f == null) {
throw new IllegalArgumentException("f == null!");
}
raf = new RandomAccessFile(f, "r");
}
/**
* Instantiates a new FileImageInputStream from the specified
* RandomAccessFile.
*
* @param raf
* the RandomAccessFile of input data.
*/
public FileImageInputStream(RandomAccessFile raf) {
if (raf == null) {
throw new IllegalArgumentException("raf == null!");
}
this.raf = raf;
}
@Override
public int read() throws IOException {
bitOffset = 0;
int res = raf.read();
if (res != -1) {
streamPos++;
}
return res;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
bitOffset = 0;
int numRead = raf.read(b, off, len);
if (numRead >= 0) {
streamPos += numRead;
}
return numRead;
}
@Override
public long length() {
try {
return raf.length();
} catch (IOException e) {
return -1L;
}
}
@Override
public void seek(long pos) throws IOException {
if (pos < getFlushedPosition()) {
throw new IndexOutOfBoundsException();
}
raf.seek(pos);
streamPos = raf.getFilePointer();
bitOffset = 0;
}
@Override
public void close() throws IOException {
super.close();
raf.close();
}
}