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// Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8.dex;
import com.android.tools.r8.Resource;
import com.android.tools.r8.utils.LebUtils;
import com.google.common.io.ByteStreams;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public abstract class BaseFile {
protected final ByteBuffer buffer;
protected BaseFile(Resource resource) throws IOException {
buffer = ByteBuffer.wrap(ByteStreams.toByteArray(resource.getStream()));
}
protected BaseFile(String name) throws IOException {
Path path = Paths.get(name);
buffer = ByteBuffer.wrap(Files.readAllBytes(path));
}
protected BaseFile(InputStream input) throws IOException {
// TODO(zerny): Remove dependencies on file names.
buffer = ByteBuffer.wrap(ByteStreams.toByteArray(input));
}
protected BaseFile(byte[] bytes) {
buffer = ByteBuffer.wrap(bytes);
}
abstract void setByteOrder();
byte[] getByteArray(int size) {
byte[] result = new byte[size];
buffer.get(result);
return result;
}
int getUleb128() {
return LebUtils.parseUleb128(this);
}
int getSleb128() {
return LebUtils.parseSleb128(this);
}
int getUleb128p1() {
return getUleb128() - 1;
}
int getUint() {
int result = buffer.getInt();
assert result >= 0; // Ensure the java int didn't overflow.
return result;
}
int getUshort() {
int result = buffer.getShort() & 0xffff;
assert result >= 0; // Ensure we have a non-negative number.
return result;
}
short getShort() {
return buffer.getShort();
}
int getUint(int offset) {
int result = buffer.getInt(offset);
assert result >= 0; // Ensure the java int didn't overflow.
return result;
}
public int getInt() {
return buffer.getInt();
}
int position() {
return buffer.position();
}
void position(int position) {
buffer.position(position);
}
void align(int alignment) {
assert (alignment & (alignment - 1)) == 0; // Check alignment is power of 2.
int p = buffer.position();
p += (alignment - (p % alignment)) & (alignment - 1);
buffer.position(p);
}
public byte get() {
return buffer.get();
}
int getUbyte() {
int result = buffer.get() & 0xff;
assert result >= 0; // Ensure we have a non-negative result.
return result;
}
int end() {
return buffer.capacity();
}
}
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