// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Author: kenton@google.com (Kenton Varda)
// Based on original Protocol Buffers design by
// Sanjay Ghemawat, Jeff Dean, and others.
//
// Contains classes used to keep track of unrecognized fields seen while
// parsing a protocol message.
#ifndef GOOGLE_PROTOBUF_UNKNOWN_FIELD_SET_H__
#define GOOGLE_PROTOBUF_UNKNOWN_FIELD_SET_H__
#include <assert.h>
#include <string>
#include <vector>
#include <google/protobuf/stubs/common.h>
// TODO(jasonh): some people seem to rely on protobufs to include this for them!
namespace google {
namespace protobuf {
namespace io {
class CodedInputStream; // coded_stream.h
class CodedOutputStream; // coded_stream.h
class ZeroCopyInputStream; // zero_copy_stream.h
}
namespace internal {
class WireFormat; // wire_format.h
class UnknownFieldSetFieldSkipperUsingCord;
// extension_set_heavy.cc
}
class Message; // message.h
class UnknownField; // below
// An UnknownFieldSet contains fields that were encountered while parsing a
// message but were not defined by its type. Keeping track of these can be
// useful, especially in that they may be written if the message is serialized
// again without being cleared in between. This means that software which
// simply receives messages and forwards them to other servers does not need
// to be updated every time a new field is added to the message definition.
//
// To get the UnknownFieldSet attached to any message, call
// Reflection::GetUnknownFields().
//
// This class is necessarily tied to the protocol buffer wire format, unlike
// the Reflection interface which is independent of any serialization scheme.
class LIBPROTOBUF_EXPORT UnknownFieldSet {
public:
UnknownFieldSet();
~UnknownFieldSet();
// Remove all fields.
inline void Clear();
// Remove all fields and deallocate internal data objects
void ClearAndFreeMemory();
// Is this set empty?
inline bool empty() const;
// Merge the contents of some other UnknownFieldSet with this one.
void MergeFrom(const UnknownFieldSet& other);
// Swaps the contents of some other UnknownFieldSet with this one.
inline void Swap(UnknownFieldSet* x);
// Computes (an estimate of) the total number of bytes currently used for
// storing the unknown fields in memory. Does NOT include
// sizeof(*this) in the calculation.
int SpaceUsedExcludingSelf() const;
// Version of SpaceUsed() including sizeof(*this).
int SpaceUsed() const;
// Returns the number of fields present in the UnknownFieldSet.
inline int field_count() const;
// Get a field in the set, where 0 <= index < field_count(). The fields
// appear in the order in which they were added.
inline const UnknownField& field(int index) const;
// Get a mutable pointer to a field in the set, where
// 0 <= index < field_count(). The fields appear in the order in which
// they were added.
inline UnknownField* mutable_field(int index);
// Adding fields ---------------------------------------------------
void AddVarint(int number, uint64 value);
void AddFixed32(int number, uint32 value);
void AddFixed64(int number, uint64 value);
void AddLengthDelimited(int number, const string& value);
string* AddLengthDelimited(int number);
UnknownFieldSet* AddGroup(int number);
// Adds an unknown field from another set.
void AddField(const UnknownField& field);
// Delete fields with indices in the range [start .. start+num-1].
// Caution: implementation moves all fields with indices [start+num .. ].
void DeleteSubrange(int start, int num);
// Delete all fields with a specific field number. The order of left fields
// is preserved.
// Caution: implementation moves all fields after the first deleted field.
void DeleteByNumber(int number);
// Parsing helpers -------------------------------------------------
// These work exactly like the similarly-named methods of Message.
bool MergeFromCodedStream(io::CodedInputStream* input);
bool ParseFromCodedStream(io::CodedInputStream* input);
bool ParseFromZeroCopyStream(io::ZeroCopyInputStream* input);
bool ParseFromArray(const void* data, int size);
inline bool ParseFromString(const string& data) {
return ParseFromArray(data.data(), data.size());
}
private:
void ClearFallback();
vector<UnknownField>* fields_;
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(UnknownFieldSet);
};
// Represents one field in an UnknownFieldSet.
class LIBPROTOBUF_EXPORT UnknownField {
public:
enum Type {
TYPE_VARINT,
TYPE_FIXED32,
TYPE_FIXED64,
TYPE_LENGTH_DELIMITED,
TYPE_GROUP
};
// The field's tag number, as seen on the wire.
inline int number() const;
// The field type.
inline Type type() const;
// Accessors -------------------------------------------------------
// Each method works only for UnknownFields of the corresponding type.
inline uint64 varint() const;
inline uint32 fixed32() const;
inline uint64 fixed64() const;
inline const string& length_delimited() const;
inline const UnknownFieldSet& group() const;
inline void set_varint(uint64 value);
inline void set_fixed32(uint32 value);
inline void set_fixed64(uint64 value);
inline void set_length_delimited(const string& value);
inline string* mutable_length_delimited();
inline UnknownFieldSet* mutable_group();
// Serialization API.
// These methods can take advantage of the underlying implementation and may
// archieve a better performance than using getters to retrieve the data and
// do the serialization yourself.
void SerializeLengthDelimitedNoTag(io::CodedOutputStream* output) const;
uint8* SerializeLengthDelimitedNoTagToArray(uint8* target) const;
inline int GetLengthDelimitedSize() const;
private:
friend class UnknownFieldSet;
// If this UnknownField contains a pointer, delete it.
void Delete();
// Make a deep copy of any pointers in this UnknownField.
void DeepCopy();
unsigned int number_ : 29;
unsigned int type_ : 3;
union {
uint64 varint_;
uint32 fixed32_;
uint64 fixed64_;
mutable union {
string* string_value_;
} length_delimited_;
UnknownFieldSet* group_;
};
};
// ===================================================================
// inline implementations
inline void UnknownFieldSet::Clear() {
if (fields_ != NULL) {
ClearFallback();
}
}
inline bool UnknownFieldSet::empty() const {
return fields_ == NULL || fields_->empty();
}
inline void UnknownFieldSet::Swap(UnknownFieldSet* x) {
std::swap(fields_, x->fields_);
}
inline int UnknownFieldSet::field_count() const {
return (fields_ == NULL) ? 0 : fields_->size();
}
inline const UnknownField& UnknownFieldSet::field(int index) const {
return (*fields_)[index];
}
inline UnknownField* UnknownFieldSet::mutable_field(int index) {
return &(*fields_)[index];
}
inline void UnknownFieldSet::AddLengthDelimited(
int number, const string& value) {
AddLengthDelimited(number)->assign(value);
}
inline int UnknownField::number() const { return number_; }
inline UnknownField::Type UnknownField::type() const {
return static_cast<Type>(type_);
}
inline uint64 UnknownField::varint () const {
assert(type_ == TYPE_VARINT);
return varint_;
}
inline uint32 UnknownField::fixed32() const {
assert(type_ == TYPE_FIXED32);
return fixed32_;
}
inline uint64 UnknownField::fixed64() const {
assert(type_ == TYPE_FIXED64);
return fixed64_;
}
inline const string& UnknownField::length_delimited() const {
assert(type_ == TYPE_LENGTH_DELIMITED);
return *length_delimited_.string_value_;
}
inline const UnknownFieldSet& UnknownField::group() const {
assert(type_ == TYPE_GROUP);
return *group_;
}
inline void UnknownField::set_varint(uint64 value) {
assert(type_ == TYPE_VARINT);
varint_ = value;
}
inline void UnknownField::set_fixed32(uint32 value) {
assert(type_ == TYPE_FIXED32);
fixed32_ = value;
}
inline void UnknownField::set_fixed64(uint64 value) {
assert(type_ == TYPE_FIXED64);
fixed64_ = value;
}
inline void UnknownField::set_length_delimited(const string& value) {
assert(type_ == TYPE_LENGTH_DELIMITED);
length_delimited_.string_value_->assign(value);
}
inline string* UnknownField::mutable_length_delimited() {
assert(type_ == TYPE_LENGTH_DELIMITED);
return length_delimited_.string_value_;
}
inline UnknownFieldSet* UnknownField::mutable_group() {
assert(type_ == TYPE_GROUP);
return group_;
}
inline int UnknownField::GetLengthDelimitedSize() const {
GOOGLE_DCHECK_EQ(TYPE_LENGTH_DELIMITED, type_);
return length_delimited_.string_value_->size();
}
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_UNKNOWN_FIELD_SET_H__