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// Copyright 2015 Google Inc. 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);
}
};
}
}
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