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protobuf serialization for mutable messages
//========================================================================
//Copyright 2007-2010 David Yu [email protected]
//------------------------------------------------------------------------
//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.dyuproject.protostuff;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
/**
* Protobuf ser/deser util for messages/objects.
*
* @author David Yu
* @created Oct 5, 2010
*/
public final class ProtobufIOUtil
{
private ProtobufIOUtil() {}
/**
* Creates a protobuf pipe from a byte array.
*/
public static Pipe newPipe(byte[] data)
{
return newPipe(data, 0, data.length);
}
/**
* Creates a protobuf pipe from a byte array.
*/
public static Pipe newPipe(byte[] data, int offset, int len)
{
final ByteArrayInput byteArrayInput = new ByteArrayInput(data, offset, len, false);
return new Pipe()
{
protected Input begin(Pipe.Schema pipeSchema) throws IOException
{
return byteArrayInput;
}
protected void end(Pipe.Schema pipeSchema, Input input,
boolean cleanupOnly) throws IOException
{
if(cleanupOnly)
return;
assert input == byteArrayInput;
}
};
}
/**
* Creates a protobuf pipe from an {@link InputStream}.
*/
public static Pipe newPipe(final InputStream in)
{
final CodedInput codedInput = new CodedInput(in, false);
return new Pipe()
{
protected Input begin(Pipe.Schema pipeSchema) throws IOException
{
return codedInput;
}
protected void end(Pipe.Schema pipeSchema, Input input,
boolean cleanupOnly) throws IOException
{
if(cleanupOnly)
return;
assert input == codedInput;
}
};
}
/**
* Merges the {@code message} with the byte array using the given {@code schema}.
*/
public static void mergeFrom(byte[] data, T message, Schema schema)
{
IOUtil.mergeFrom(data, 0, data.length, message, schema, false);
}
/**
* Merges the {@code message} with the byte array using the given {@code schema}.
*/
public static void mergeFrom(byte[] data, int offset, int length, T message,
Schema schema)
{
IOUtil.mergeFrom(data, offset, length, message, schema, false);
}
/**
* Merges the {@code message} from the {@link InputStream} using
* the given {@code schema}.
*/
public static void mergeFrom(InputStream in, T message, Schema schema)
throws IOException
{
IOUtil.mergeFrom(in, message, schema, false);
}
/**
* Merges the {@code message} from the {@link InputStream} using
* the given {@code schema}.
*
* The {@code buffer}'s internal byte array will be used for reading the message.
*/
public static void mergeFrom(InputStream in, T message, Schema schema,
LinkedBuffer buffer) throws IOException
{
IOUtil.mergeFrom(in, buffer.buffer, message, schema, false);
}
/**
* Merges the {@code message} (delimited) from the {@link InputStream}
* using the given {@code schema}.
*
* @return the size of the message
*/
public static int mergeDelimitedFrom(InputStream in, T message, Schema schema)
throws IOException
{
return IOUtil.mergeDelimitedFrom(in, message, schema, false);
}
/**
* Merges the {@code message} (delimited) from the {@link InputStream}
* using the given {@code schema}.
*
* The delimited message size must not be larger than the
* {@code buffer}'s size/capacity.
* {@link ProtobufException} "size limit exceeded" is thrown otherwise.
*
* @return the size of the message
*/
public static int mergeDelimitedFrom(InputStream in, T message, Schema schema,
LinkedBuffer buffer) throws IOException
{
return IOUtil.mergeDelimitedFrom(in, buffer.buffer, message, schema, false);
}
/**
* Used by the code generated messages that implement {@link java.io.Externalizable}.
* Merges from the {@link DataInput}.
*
* @return the size of the message
*/
public static int mergeDelimitedFrom(DataInput in, T message, Schema schema)
throws IOException
{
return IOUtil.mergeDelimitedFrom(in, message, schema, false);
}
/**
* Serializes the {@code message} into a byte array using the given schema.
*
* @return the byte array containing the data.
*/
public static byte[] toByteArray(T message, Schema schema, LinkedBuffer buffer)
{
if(buffer.start != buffer.offset)
throw new IllegalArgumentException("Buffer previously used and had not been reset.");
final ProtobufOutput output = new ProtobufOutput(buffer);
try
{
schema.writeTo(output, message);
}
catch (IOException e)
{
throw new RuntimeException("Serializing to a byte array threw an IOException " +
"(should never happen).", e);
}
return output.toByteArray();
}
/**
* Writes the {@code message} into the {@link LinkedBuffer} using the given schema.
*
* @return the size of the message
*/
public static int writeTo(LinkedBuffer buffer, T message, Schema schema)
{
if(buffer.start != buffer.offset)
throw new IllegalArgumentException("Buffer previously used and had not been reset.");
final ProtobufOutput output = new ProtobufOutput(buffer);
try
{
schema.writeTo(output, message);
}
catch (IOException e)
{
throw new RuntimeException("Serializing to a LinkedBuffer threw an IOException " +
"(should never happen).", e);
}
return output.getSize();
}
/**
* Serializes the {@code message} into an {@link OutputStream} using the given schema.
*
* @return the size of the message
*/
public static int writeTo(OutputStream out, T message, Schema schema,
LinkedBuffer buffer) throws IOException
{
if(buffer.start != buffer.offset)
throw new IllegalArgumentException("Buffer previously used and had not been reset.");
final ProtobufOutput output = new ProtobufOutput(buffer);
schema.writeTo(output, message);
return LinkedBuffer.writeTo(out, buffer);
}
/**
* Serializes the {@code message}, prefixed with its length, into an
* {@link OutputStream}.
*
* @return the size of the message
*/
public static int writeDelimitedTo(OutputStream out, T message, Schema schema,
LinkedBuffer buffer) throws IOException
{
if(buffer.start != buffer.offset)
throw new IllegalArgumentException("Buffer previously used and had not been reset.");
final ProtobufOutput output = new ProtobufOutput(buffer);
schema.writeTo(output, message);
final int size = output.getSize();
ProtobufOutput.writeRawVarInt32Bytes(out, size);
final int msgSize = LinkedBuffer.writeTo(out, buffer);
assert size == msgSize;
return size;
}
/**
* Used by the code generated messages that implement {@link java.io.Externalizable}.
* Writes to the {@link DataOutput}.
*
* @return the size of the message.
*/
public static int writeDelimitedTo(DataOutput out, T message, Schema schema)
throws IOException
{
final LinkedBuffer buffer = new LinkedBuffer(LinkedBuffer.MIN_BUFFER_SIZE);
final ProtobufOutput output = new ProtobufOutput(buffer);
schema.writeTo(output, message);
final int size = output.getSize();
ProtobufOutput.writeRawVarInt32Bytes(out, size);
final int msgSize = LinkedBuffer.writeTo(out, buffer);
assert size == msgSize;
return size;
}
/**
* Serializes the {@code messages} (delimited) into an {@link OutputStream}
* using the given schema.
*
* @return the total size of the messages (excluding the length prefix varint)
*/
public static int writeListTo(OutputStream out, List messages, Schema schema,
LinkedBuffer buffer) throws IOException
{
if(buffer.start != buffer.offset)
throw new IllegalArgumentException("Buffer previously used and had not been reset.");
final ProtobufOutput output = new ProtobufOutput(buffer);
int totalSize = 0;
for(T m : messages)
{
schema.writeTo(output, m);
final int size = output.getSize();
ProtobufOutput.writeRawVarInt32Bytes(out, size);
final int msgSize = LinkedBuffer.writeTo(out, buffer);
assert size == msgSize;
totalSize += size;
output.clear();
}
return totalSize;
}
/**
* Parses the {@code messages} (delimited) from the {@link InputStream}
* using the given {@code schema}.
*
* @return the list containing the messages.
*/
public static List parseListFrom(InputStream in, Schema schema) throws IOException
{
final ArrayList list = new ArrayList();
byte[] buf = null;
int biggestLen = 0;
LimitedInputStream lin = null;
for(int size=in.read(); size!=-1; size=in.read())
{
final T message = schema.newMessage();
list.add(message);
final int len = size < 0x80 ? size : CodedInput.readRawVarint32(in, size);
if(len != 0)
{
// not an empty message
if(len > CodedInput.DEFAULT_BUFFER_SIZE)
{
// message too big
if(lin == null)
lin = new LimitedInputStream(in);
final CodedInput input = new CodedInput(lin.limit(len), false);
schema.mergeFrom(input, message);
input.checkLastTagWas(0);
continue;
}
if(biggestLen < len)
{
// cannot reuse buffer, allocate a bigger buffer
// discard the last one for gc
buf = new byte[len];
biggestLen = len;
}
IOUtil.fillBufferFrom(in, buf, 0, len);
final ByteArrayInput input = new ByteArrayInput(buf, 0, len, false);
try
{
schema.mergeFrom(input, message);
}
catch(ArrayIndexOutOfBoundsException e)
{
throw ProtobufException.truncatedMessage(e);
}
input.checkLastTagWas(0);
}
}
return list;
}
/**
* Optimal/Optional mergeDelimitedFrom - If the message does not fit the buffer,
* no merge is done and this method will return false.
*
* This is strictly for reading a single message from the stream because the
* buffer is aggressively filled when reading the delimited size (which could
* result into reading more bytes than it has to).
*
* The remaining bytes will be drained (consumed and discared) when the message
* is too large.
*/
public static boolean optMergeDelimitedFrom(InputStream in,
T message, Schema schema,
LinkedBuffer buffer) throws IOException
{
return optMergeDelimitedFrom(in, message, schema, true, buffer);
}
/**
* Optimal/Optional mergeDelimitedFrom - If the message does not fit the buffer,
* no merge is done and this method will return false.
*
* This is strictly for reading a single message from the stream because the
* buffer is aggressively filled when reading the delimited size (which could
* result into reading more bytes than it has to).
*/
public static boolean optMergeDelimitedFrom(InputStream in,
T message, Schema schema, boolean drainRemainingBytesIfTooLarge,
LinkedBuffer buffer) throws IOException
{
if(buffer.start != buffer.offset)
throw new IllegalArgumentException("Buffer previously used and had not been reset.");
final int size = IOUtil.fillBufferWithDelimitedMessageFrom(in,
drainRemainingBytesIfTooLarge, buffer);
if(size == 0)
{
// empty message
return true;
}
if(buffer.start == buffer.offset)
{
// read offset not set ... message too large
return false;
}
final ByteArrayInput input = new ByteArrayInput(buffer.buffer,
buffer.offset, size, false);
try
{
schema.mergeFrom(input, message);
input.checkLastTagWas(0);
}
catch(ArrayIndexOutOfBoundsException e)
{
throw ProtobufException.truncatedMessage(e);
}
finally
{
// reset
buffer.offset = buffer.start;
}
return true;
}
/**
* Optimal writeDelimitedTo - The varint32 prefix is written to the buffer instead
* of directly writing to outputstream.
*
* @return the size of the message
*/
public static int optWriteDelimitedTo(OutputStream out, T message,
Schema schema, LinkedBuffer buffer) throws IOException
{
if(buffer.start != buffer.offset)
throw new IllegalArgumentException("Buffer previously used and had not been reset.");
final ProtobufOutput output = new ProtobufOutput(buffer);
// leave space for varint32
buffer.offset = buffer.start + 5;
output.size += 5;
schema.writeTo(output, message);
final int size = output.size - 5;
final int delimOffset = IOUtil.putVarInt32AndGetOffset(size, buffer.buffer,
buffer.start);
// write to stream
out.write(buffer.buffer, delimOffset, buffer.offset - delimOffset);
// flush remaining
if(buffer.next != null)
LinkedBuffer.writeTo(out, buffer.next);
return size;
}
}
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