123 lines
3.2 KiB
Java
123 lines
3.2 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.imageio.stream;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.io.File;
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import java.io.FileNotFoundException;
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/**
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* The FileImageInputStream class implements ImageInputStream and obtains its
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* input data from a File or RandomAccessFile.
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*
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* @since Android 1.0
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*/
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public class FileImageInputStream extends ImageInputStreamImpl {
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/**
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* The raf.
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*/
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RandomAccessFile raf;
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/**
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* Instantiates a new FileImageInputStream from the specified File.
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*
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* @param f
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* the File of input data.
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* @throws FileNotFoundException
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* if the specified file doesn't exist.
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* @throws IOException
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* if an I/O exception has occurred.
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*/
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@SuppressWarnings( {
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"DuplicateThrows"
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})
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public FileImageInputStream(File f) throws FileNotFoundException, IOException {
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if (f == null) {
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throw new IllegalArgumentException("f == null!");
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}
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raf = new RandomAccessFile(f, "r");
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}
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/**
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* Instantiates a new FileImageInputStream from the specified
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* RandomAccessFile.
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*
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* @param raf
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* the RandomAccessFile of input data.
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*/
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public FileImageInputStream(RandomAccessFile raf) {
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if (raf == null) {
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throw new IllegalArgumentException("raf == null!");
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}
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this.raf = raf;
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}
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@Override
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public int read() throws IOException {
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bitOffset = 0;
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int res = raf.read();
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if (res != -1) {
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streamPos++;
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}
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return res;
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}
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@Override
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public int read(byte[] b, int off, int len) throws IOException {
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bitOffset = 0;
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int numRead = raf.read(b, off, len);
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if (numRead >= 0) {
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streamPos += numRead;
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}
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return numRead;
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}
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@Override
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public long length() {
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try {
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return raf.length();
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} catch (IOException e) {
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return -1L;
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}
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}
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@Override
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public void seek(long pos) throws IOException {
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if (pos < getFlushedPosition()) {
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throw new IndexOutOfBoundsException();
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}
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raf.seek(pos);
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streamPos = raf.getFilePointer();
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bitOffset = 0;
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}
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@Override
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public void close() throws IOException {
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super.close();
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raf.close();
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}
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}
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