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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.android.ide.eclipse.gltrace;
import com.android.ide.eclipse.gltrace.GLProtoBuf.GLMessage;
import com.google.protobuf.InvalidProtocolBufferException;
import java.io.EOFException;
import java.io.IOException;
import java.io.RandomAccessFile;
public class TraceFileReader {
/** Maximum size for a protocol buffer message.
* The message size is dominated by the size of the compressed framebuffer.
* Currently, we assume that the maximum is for a 1080p display. Since the buffers compress
* well, we should probably never get close to this.
*/
private static final int MAX_PROTOBUF_SIZE = 1920 * 1080 * 100;
/**
* Obtain the next protobuf message in this file.
* @param file file to read from
* @param offset offset to start reading from
* @return protobuf message at given offset
* @throws IOException in case of file I/O errors
* @throws InvalidProtocolBufferException if protobuf is not well formed
*/
public GLMessage getMessageAtOffset(RandomAccessFile file, long offset) throws IOException {
int len;
byte[] b;
try {
if (offset != -1) {
file.seek(offset);
}
len = file.readInt();
if (len > MAX_PROTOBUF_SIZE) {
String msg = String.format(
"Unexpectedly large (%d bytes) protocol buffer message encountered.",
len);
throw new InvalidProtocolBufferException(msg);
}
b = new byte[len];
file.readFully(b);
} catch (EOFException e) {
return null;
}
return GLMessage.parseFrom(b);
}
}
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