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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 libthrift091.protocol;
import libthrift091.TException;
/**
* Utility class with static methods for interacting with protocol data
* streams.
*
*/
public class TProtocolUtil {
/**
* The maximum recursive depth the skip() function will traverse before
* throwing a TException.
*/
private static int maxSkipDepth = Integer.MAX_VALUE;
/**
* Specifies the maximum recursive depth that the skip function will
* traverse before throwing a TException. This is a global setting, so
* any call to skip in this JVM will enforce this value.
*
* @param depth the maximum recursive depth. A value of 2 would allow
* the skip function to skip a structure or collection with basic children,
* but it would not permit skipping a struct that had a field containing
* a child struct. A value of 1 would only allow skipping of simple
* types and empty structs/collections.
*/
public static void setMaxSkipDepth(int depth) {
maxSkipDepth = depth;
}
/**
* Skips over the next data element from the provided input TProtocol object.
*
* @param prot the protocol object to read from
* @param type the next value will be interpreted as this TType value.
*/
public static void skip(TProtocol prot, byte type)
throws TException {
skip(prot, type, maxSkipDepth);
}
/**
* Skips over the next data element from the provided input TProtocol object.
*
* @param prot the protocol object to read from
* @param type the next value will be interpreted as this TType value.
* @param maxDepth this function will only skip complex objects to this
* recursive depth, to prevent Java stack overflow.
*/
public static void skip(TProtocol prot, byte type, int maxDepth)
throws TException {
if (maxDepth <= 0) {
throw new TException("Maximum skip depth exceeded");
}
switch (type) {
case TType.BOOL:
prot.readBool();
break;
case TType.BYTE:
prot.readByte();
break;
case TType.I16:
prot.readI16();
break;
case TType.I32:
prot.readI32();
break;
case TType.I64:
prot.readI64();
break;
case TType.DOUBLE:
prot.readDouble();
break;
case TType.STRING:
prot.readBinary();
break;
case TType.STRUCT:
prot.readStructBegin();
while (true) {
TField field = prot.readFieldBegin();
if (field.type == TType.STOP) {
break;
}
skip(prot, field.type, maxDepth - 1);
prot.readFieldEnd();
}
prot.readStructEnd();
break;
case TType.MAP:
TMap map = prot.readMapBegin();
for (int i = 0; i < map.size; i++) {
skip(prot, map.keyType, maxDepth - 1);
skip(prot, map.valueType, maxDepth - 1);
}
prot.readMapEnd();
break;
case TType.SET:
TSet set = prot.readSetBegin();
for (int i = 0; i < set.size; i++) {
skip(prot, set.elemType, maxDepth - 1);
}
prot.readSetEnd();
break;
case TType.LIST:
TList list = prot.readListBegin();
for (int i = 0; i < list.size; i++) {
skip(prot, list.elemType, maxDepth - 1);
}
prot.readListEnd();
break;
default:
break;
}
}
/**
* Attempt to determine the protocol used to serialize some data.
*
* The guess is based on known specificities of supported protocols.
* In some cases, no guess can be done, in that case we return the
* fallback TProtocolFactory.
* To be certain to correctly detect the protocol, the first encoded
* field should have a field id < 256
*
* @param data The serialized data to guess the protocol for.
* @param fallback The TProtocol to return if no guess can be made.
* @return a Class implementing TProtocolFactory which can be used to create a deserializer.
*/
public static TProtocolFactory guessProtocolFactory(byte[] data, TProtocolFactory fallback) {
//
// If the first and last bytes are opening/closing curly braces we guess the protocol as
// being TJSONProtocol.
// It could not be a TCompactBinary encoding for a field of type 0xb (Map)
// with delta id 7 as the last byte for TCompactBinary is always 0.
//
if ('{' == data[0] && '}' == data[data.length - 1]) {
return new TJSONProtocol.Factory();
}
//
// If the last byte is not 0, then it cannot be TCompactProtocol, it must be
// TBinaryProtocol.
//
if (data[data.length - 1] != 0) {
return new TBinaryProtocol.Factory();
}
//
// A first byte of value > 16 indicates TCompactProtocol was used, and the first byte
// encodes a delta field id (id <= 15) and a field type.
//
if (data[0] > 0x10) {
return new TCompactProtocol.Factory();
}
//
// If the second byte is 0 then it is a field id < 256 encoded by TBinaryProtocol.
// It cannot possibly be TCompactProtocol since a value of 0 would imply a field id
// of 0 as the zig zag varint encoding would end.
//
if (data.length > 1 && 0 == data[1]) {
return new TBinaryProtocol.Factory();
}
//
// If bit 7 of the first byte of the field id is set then we have two choices:
// 1. A field id > 63 was encoded with TCompactProtocol.
// 2. A field id > 0x7fff (32767) was encoded with TBinaryProtocol and the last byte of the
// serialized data is 0.
// Option 2 is impossible since field ids are short and thus limited to 32767.
//
if (data.length > 1 && (data[1] & 0x80) != 0) {
return new TCompactProtocol.Factory();
}
//
// The remaining case is either a field id <= 63 encoded as TCompactProtocol,
// one >= 256 encoded with TBinaryProtocol with a last byte at 0, or an empty structure.
// As we cannot really decide, we return the fallback protocol.
//
return fallback;
}
}
