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Diffstat (limited to 'awt/javax/imageio/stream/FileImageInputStream.java')
-rw-r--r-- | awt/javax/imageio/stream/FileImageInputStream.java | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/awt/javax/imageio/stream/FileImageInputStream.java b/awt/javax/imageio/stream/FileImageInputStream.java new file mode 100644 index 0000000..b9b6002 --- /dev/null +++ b/awt/javax/imageio/stream/FileImageInputStream.java @@ -0,0 +1,122 @@ +/* + * 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(); + } +} |