| // Copyright 2015 The Bazel Authors. All rights reserved. |
| // |
| // Licensed 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 com.google.devtools.build.zip; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.charset.Charset; |
| |
| /** |
| * A test ZIP file reader that provides slow {@link InputStream}s for reading sections of the file. |
| * |
| * <p>Providing InputStreams that do not read or skip the requested amount allows testing that the |
| * parsing code properly handles cases where the data is not immediately available. |
| */ |
| public class SlowZipReader extends ZipReader { |
| |
| /** |
| * Opens a zip file for raw acceess. Passes through to {@link ZipReader#ZipReader(File)}. |
| */ |
| public SlowZipReader(File file) throws IOException { |
| super(file); |
| } |
| |
| /** |
| * Opens a zip file for raw acceess. Passes through to {@link ZipReader#ZipReader(File, Charset)}. |
| */ |
| public SlowZipReader(File file, Charset charset) throws IOException { |
| super(file, charset); |
| } |
| |
| /** |
| * Opens a zip file for raw acceess. Passes through to |
| * {@link ZipReader#ZipReader(File, Charset, boolean)}. |
| */ |
| public SlowZipReader(File file, Charset charset, boolean strictEntries) throws IOException { |
| super(file, charset, strictEntries); |
| } |
| |
| /** |
| * Returns a new slow {@link InputStream} positioned at fileOffset. |
| * |
| * @throws IOException if an I/O error has occurred |
| */ |
| @Override |
| protected InputStream getStreamAt(long fileOffset) throws IOException { |
| final InputStream in = super.getStreamAt(fileOffset); |
| return new InputStream() { |
| @Override |
| public int read() throws IOException { |
| return in.read(); |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| checkArgument(b != null); |
| checkArgument((len >= 0) && (off >= 0)); |
| checkArgument(len <= b.length - off); |
| if (len == 0) { |
| return 0; |
| } |
| int value = read(); |
| if (value == -1) { |
| return -1; |
| } |
| b[off] = (byte) value; |
| return 1; |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| return super.skip(1); |
| } |
| }; |
| } |
| } |