// 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.android.ziputils;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.HashMap;
import java.util.Map;
/**
* Simple in-memory test file system.
*/
class FakeFileSystem extends FileSystem {
private final Map<String, byte[]> files = new HashMap<>();
public FakeFileSystem() {
FileSystem.fileSystem = this;
}
public void addFile(String name, byte[] content) {
files.put(name, content);
}
public void addFile(String name, String content) {
files.put(name, content.getBytes(UTF_8));
}
public String content(String filename) throws IOException {
byte[] data = files.get(filename);
if (data == null) {
throw new FileNotFoundException();
}
return new String(data, UTF_8);
}
public byte[] toByteArray(String filename) throws IOException {
byte[] data = files.get(filename);
if (data == null) {
throw new FileNotFoundException();
}
return data;
}
@Override
public FileChannel getInputChannel(String filename) throws IOException {
return new FakeReadChannel(filename);
}
@Override
public FileChannel getOutputChannel(String filename, boolean append) throws IOException {
return new FakeWriteChannel(filename);
}
@Override
public InputStream getInputStream(String filename) throws IOException {
byte[] data = files.get(filename);
if (data == null) {
throw new FileNotFoundException();
}
return new ByteArrayInputStream(data);
}
class FakeReadChannel extends FileChannel {
final String name;
byte[] data;
int position;
public FakeReadChannel(String filename) throws IOException {
this.name = filename;
this.data = toByteArray(filename);
this.position = 0;
}
@Override
public int read(ByteBuffer dst) throws IOException {
if (position >= data.length) {
return -1;
}
int remaining = data.length - position;
if (dst.remaining() < remaining) {
remaining = dst.remaining();
}
dst.put(data, position, remaining);
position += remaining;
return remaining;
}
@Override
public long read(ByteBuffer[] dsts, int offset, int length) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public int write(ByteBuffer src) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long write(ByteBuffer[] srcs, int offset, int length) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long position() throws IOException {
return position;
}
@Override
public FileChannel position(long newPosition) throws IOException {
position = (int) newPosition;
return this;
}
@Override
public long size() throws IOException {
return data.length;
}
@Override
public FileChannel truncate(long size) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void force(boolean metaData) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long transferTo(long position, long count, WritableByteChannel target)
throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long transferFrom(ReadableByteChannel src, long position, long count)
throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public int read(ByteBuffer dst, long position) throws IOException {
if (position < 0 || position >= data.length) {
throw new IOException("out of bounds");
}
int remaining = data.length - (int) position;
if (dst.remaining() < remaining) {
remaining = dst.remaining();
}
dst.put(data, (int) position, remaining);
return remaining;
}
@Override
public int write(ByteBuffer src, long position) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public MappedByteBuffer map(FileChannel.MapMode mode, long position, long size)
throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
public ByteBuffer map(long position, long size) {
return ByteBuffer.wrap(data, (int) position, (int) size).slice();
}
@Override
public FileLock lock(long position, long size, boolean shared) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public FileLock tryLock(long position, long size, boolean shared) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
protected void implCloseChannel() throws IOException {
}
}
class FakeWriteChannel extends FileChannel {
final String name;
final ByteArrayOutputStream buf;
int position;
public FakeWriteChannel(String filename) {
this.name = filename;
this.buf = new ByteArrayOutputStream();
this.position = 0;
}
@Override
public int read(ByteBuffer dst) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long read(ByteBuffer[] dsts, int offset, int length) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public int write(ByteBuffer src) throws IOException {
byte[] bytes = new byte[src.remaining()];
src.get(bytes);
buf.write(bytes);
position += bytes.length;
return bytes.length;
}
@Override
public long write(ByteBuffer[] srcs, int offset, int length) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long position() throws IOException {
return position;
}
@Override
public FileChannel position(long newPosition) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long size() throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public FileChannel truncate(long size) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void force(boolean metaData) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long transferTo(long position, long count, WritableByteChannel target)
throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public long transferFrom(ReadableByteChannel src, long position, long count)
throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public int read(ByteBuffer dst, long position) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public int write(ByteBuffer src, long position) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public MappedByteBuffer map(FileChannel.MapMode mode, long position, long size)
throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public FileLock lock(long position, long size, boolean shared) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public FileLock tryLock(long position, long size, boolean shared) throws IOException {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
protected void implCloseChannel() throws IOException {
files.put(name, buf.toByteArray());
}
}
}