Browse Source
According the javadoc, and implied by the name of the class, NB is about network byte order. The purpose of moving the IO only, and non-byte order related functions to another class is to make it easier for new contributors to understand that they can use these functions in general and it's also makes it easier to understand where to put new IO related utility functions Change-Id: I4a9f6b39d5564bc8a694b366e7ff3cc758c5181b Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>stable-0.7
Robin Rosenberg
15 years ago
committed by
Shawn O. Pearce
20 changed files with 261 additions and 200 deletions
@ -0,0 +1,198 @@ |
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/* |
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* Copyright (C) 2008-2009, Google Inc. |
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* Copyright (C) 2009, Robin Rosenberg <robin.rosenberg@dewire.com> |
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* Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org> |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* names of its contributors may be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.util; |
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import java.io.EOFException; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.FileNotFoundException; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.FileChannel; |
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/** |
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* Input/Output utilities |
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*/ |
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public class IO { |
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/** |
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* Read an entire local file into memory as a byte array. |
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* |
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* @param path |
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* location of the file to read. |
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* @return complete contents of the requested local file. |
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* @throws FileNotFoundException |
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* the file does not exist. |
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* @throws IOException |
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* the file exists, but its contents cannot be read. |
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*/ |
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public static final byte[] readFully(final File path) |
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throws FileNotFoundException, IOException { |
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return IO.readFully(path, Integer.MAX_VALUE); |
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} |
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/** |
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* Read an entire local file into memory as a byte array. |
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* |
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* @param path |
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* location of the file to read. |
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* @param max |
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* maximum number of bytes to read, if the file is larger than |
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* this limit an IOException is thrown. |
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* @return complete contents of the requested local file. |
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* @throws FileNotFoundException |
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* the file does not exist. |
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* @throws IOException |
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* the file exists, but its contents cannot be read. |
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*/ |
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public static final byte[] readFully(final File path, final int max) |
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throws FileNotFoundException, IOException { |
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final FileInputStream in = new FileInputStream(path); |
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try { |
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final long sz = in.getChannel().size(); |
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if (sz > max) |
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throw new IOException("File is too large: " + path); |
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final byte[] buf = new byte[(int) sz]; |
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IO.readFully(in, buf, 0, buf.length); |
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return buf; |
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} finally { |
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try { |
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in.close(); |
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} catch (IOException ignored) { |
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// ignore any close errors, this was a read only stream
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} |
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} |
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} |
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/** |
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* Read the entire byte array into memory, or throw an exception. |
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* |
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* @param fd |
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* input stream to read the data from. |
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* @param dst |
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* buffer that must be fully populated, [off, off+len). |
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* @param off |
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* position within the buffer to start writing to. |
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* @param len |
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* number of bytes that must be read. |
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* @throws EOFException |
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* the stream ended before dst was fully populated. |
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* @throws IOException |
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* there was an error reading from the stream. |
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*/ |
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public static void readFully(final InputStream fd, final byte[] dst, |
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int off, int len) throws IOException { |
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while (len > 0) { |
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final int r = fd.read(dst, off, len); |
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if (r <= 0) |
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throw new EOFException("Short read of block."); |
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off += r; |
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len -= r; |
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} |
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} |
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/** |
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* Read the entire byte array into memory, or throw an exception. |
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* |
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* @param fd |
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* file to read the data from. |
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* @param pos |
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* position to read from the file at. |
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* @param dst |
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* buffer that must be fully populated, [off, off+len). |
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* @param off |
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* position within the buffer to start writing to. |
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* @param len |
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* number of bytes that must be read. |
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* @throws EOFException |
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* the stream ended before dst was fully populated. |
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* @throws IOException |
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* there was an error reading from the stream. |
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*/ |
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public static void readFully(final FileChannel fd, long pos, |
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final byte[] dst, int off, int len) throws IOException { |
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while (len > 0) { |
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final int r = fd.read(ByteBuffer.wrap(dst, off, len), pos); |
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if (r <= 0) |
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throw new EOFException("Short read of block."); |
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pos += r; |
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off += r; |
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len -= r; |
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} |
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} |
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/** |
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* Skip an entire region of an input stream. |
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* <p> |
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* The input stream's position is moved forward by the number of requested |
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* bytes, discarding them from the input. This method does not return until |
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* the exact number of bytes requested has been skipped. |
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* |
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* @param fd |
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* the stream to skip bytes from. |
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* @param toSkip |
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* total number of bytes to be discarded. Must be >= 0. |
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* @throws EOFException |
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* the stream ended before the requested number of bytes were |
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* skipped. |
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* @throws IOException |
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* there was an error reading from the stream. |
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*/ |
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public static void skipFully(final InputStream fd, long toSkip) |
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throws IOException { |
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while (toSkip > 0) { |
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final long r = fd.skip(toSkip); |
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if (r <= 0) |
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throw new EOFException("Short skip of block"); |
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toSkip -= r; |
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} |
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} |
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private IO() { |
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// Don't create instances of a static only utility.
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} |
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} |
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