1
// Protocol Buffers - Google's data interchange format
2
// Copyright 2008 Google Inc. All rights reserved.
3
// http://code.google.com/p/protobuf/
5
// Redistribution and use in source and binary forms, with or without
6
// modification, are permitted provided that the following conditions are
9
// * Redistributions of source code must retain the above copyright
10
// notice, this list of conditions and the following disclaimer.
11
// * Redistributions in binary form must reproduce the above
12
// copyright notice, this list of conditions and the following disclaimer
13
// in the documentation and/or other materials provided with the
15
// * Neither the name of Google Inc. nor the names of its
16
// contributors may be used to endorse or promote products derived from
17
// this software without specific prior written permission.
19
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31
// Author: kenton@google.com (Kenton Varda)
32
// atenasio@google.com (Chris Atenasio) (ZigZag transform)
33
// Based on original Protocol Buffers design by
34
// Sanjay Ghemawat, Jeff Dean, and others.
36
// This header is logically internal, but is made public because it is used
37
// from protocol-compiler-generated code, which may reside in other components.
39
#ifndef GOOGLE_PROTOBUF_WIRE_FORMAT_H__
40
#define GOOGLE_PROTOBUF_WIRE_FORMAT_H__
43
#include <google/protobuf/descriptor.pb.h>
44
#include <google/protobuf/descriptor.h>
45
#include <google/protobuf/message.h>
46
#include <google/protobuf/wire_format_lite.h>
48
// Do UTF-8 validation on string type in Debug build only
50
#define GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
56
class CodedInputStream; // coded_stream.h
57
class CodedOutputStream; // coded_stream.h
59
class UnknownFieldSet; // unknown_field_set.h
65
// This class is for internal use by the protocol buffer library and by
66
// protocol-complier-generated message classes. It must not be called
67
// directly by clients.
69
// This class contains code for implementing the binary protocol buffer
70
// wire format via reflection. The WireFormatLite class implements the
71
// non-reflection based routines.
73
// This class is really a namespace that contains only static methods
74
class LIBPROTOBUF_EXPORT WireFormat {
77
// Given a field return its WireType
78
static inline WireFormatLite::WireType WireTypeForField(
79
const FieldDescriptor* field);
81
// Given a FieldSescriptor::Type return its WireType
82
static inline WireFormatLite::WireType WireTypeForFieldType(
83
FieldDescriptor::Type type);
85
// Compute the byte size of a tag. For groups, this includes both the start
87
static inline int TagSize(int field_number, FieldDescriptor::Type type);
89
// These procedures can be used to implement the methods of Message which
90
// handle parsing and serialization of the protocol buffer wire format
91
// using only the Reflection interface. When you ask the protocol
92
// compiler to optimize for code size rather than speed, it will implement
93
// those methods in terms of these procedures. Of course, these are much
94
// slower than the specialized implementations which the protocol compiler
95
// generates when told to optimize for speed.
97
// Read a message in protocol buffer wire format.
99
// This procedure reads either to the end of the input stream or through
100
// a WIRETYPE_END_GROUP tag ending the message, whichever comes first.
101
// It returns false if the input is invalid.
103
// Required fields are NOT checked by this method. You must call
104
// IsInitialized() on the resulting message yourself.
105
static bool ParseAndMergePartial(io::CodedInputStream* input,
108
// Serialize a message in protocol buffer wire format.
110
// Any embedded messages within the message must have their correct sizes
111
// cached. However, the top-level message need not; its size is passed as
112
// a parameter to this procedure.
114
// These return false iff the underlying stream returns a write error.
115
static void SerializeWithCachedSizes(
116
const Message& message,
117
int size, io::CodedOutputStream* output);
119
// Implements Message::ByteSize() via reflection. WARNING: The result
120
// of this method is *not* cached anywhere. However, all embedded messages
121
// will have their ByteSize() methods called, so their sizes will be cached.
122
// Therefore, calling this method is sufficient to allow you to call
123
// WireFormat::SerializeWithCachedSizes() on the same object.
124
static int ByteSize(const Message& message);
126
// -----------------------------------------------------------------
127
// Helpers for dealing with unknown fields
129
// Skips a field value of the given WireType. The input should start
130
// positioned immediately after the tag. If unknown_fields is non-NULL,
131
// the contents of the field will be added to it.
132
static bool SkipField(io::CodedInputStream* input, uint32 tag,
133
UnknownFieldSet* unknown_fields);
135
// Reads and ignores a message from the input. If unknown_fields is non-NULL,
136
// the contents will be added to it.
137
static bool SkipMessage(io::CodedInputStream* input,
138
UnknownFieldSet* unknown_fields);
140
// Write the contents of an UnknownFieldSet to the output.
141
static void SerializeUnknownFields(const UnknownFieldSet& unknown_fields,
142
io::CodedOutputStream* output);
143
// Same as above, except writing directly to the provided buffer.
144
// Requires that the buffer have sufficient capacity for
145
// ComputeUnknownFieldsSize(unknown_fields).
147
// Returns a pointer past the last written byte.
148
static uint8* SerializeUnknownFieldsToArray(
149
const UnknownFieldSet& unknown_fields,
152
// Same thing except for messages that have the message_set_wire_format
154
static void SerializeUnknownMessageSetItems(
155
const UnknownFieldSet& unknown_fields,
156
io::CodedOutputStream* output);
157
// Same as above, except writing directly to the provided buffer.
158
// Requires that the buffer have sufficient capacity for
159
// ComputeUnknownMessageSetItemsSize(unknown_fields).
161
// Returns a pointer past the last written byte.
162
static uint8* SerializeUnknownMessageSetItemsToArray(
163
const UnknownFieldSet& unknown_fields,
166
// Compute the size of the UnknownFieldSet on the wire.
167
static int ComputeUnknownFieldsSize(const UnknownFieldSet& unknown_fields);
169
// Same thing except for messages that have the message_set_wire_format
171
static int ComputeUnknownMessageSetItemsSize(
172
const UnknownFieldSet& unknown_fields);
175
// Helper functions for encoding and decoding tags. (Inlined below and in
178
// This is different from MakeTag(field->number(), field->type()) in the case
179
// of packed repeated fields.
180
static uint32 MakeTag(const FieldDescriptor* field);
182
// Parse a single field. The input should start out positioned immidately
184
static bool ParseAndMergeField(
186
const FieldDescriptor* field, // May be NULL for unknown
188
io::CodedInputStream* input);
190
// Serialize a single field.
191
static void SerializeFieldWithCachedSizes(
192
const FieldDescriptor* field, // Cannot be NULL
193
const Message& message,
194
io::CodedOutputStream* output);
196
// Compute size of a single field. If the field is a message type, this
197
// will call ByteSize() for the embedded message, insuring that it caches
199
static int FieldByteSize(
200
const FieldDescriptor* field, // Cannot be NULL
201
const Message& message);
203
// Parse/serialize a MessageSet::Item group. Used with messages that use
204
// opion message_set_wire_format = true.
205
static bool ParseAndMergeMessageSetItem(
206
io::CodedInputStream* input,
208
static void SerializeMessageSetItemWithCachedSizes(
209
const FieldDescriptor* field,
210
const Message& message,
211
io::CodedOutputStream* output);
212
static int MessageSetItemByteSize(
213
const FieldDescriptor* field,
214
const Message& message);
216
// Computes the byte size of a field, excluding tags. For packed fields, it
217
// only includes the size of the raw data, and not the size of the total
218
// length, but for other length-delimited types, the size of the length is
220
static int FieldDataOnlyByteSize(
221
const FieldDescriptor* field, // Cannot be NULL
222
const Message& message);
229
// Verifies that a string field is valid UTF8, logging an error if not.
230
static void VerifyUTF8String(const char* data, int size, Operation op);
233
// Verifies that a string field is valid UTF8, logging an error if not.
234
static void VerifyUTF8StringFallback(
241
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(WireFormat);
244
// Subclass of FieldSkipper which saves skipped fields to an UnknownFieldSet.
245
class LIBPROTOBUF_EXPORT UnknownFieldSetFieldSkipper : public FieldSkipper {
247
UnknownFieldSetFieldSkipper(UnknownFieldSet* unknown_fields)
248
: unknown_fields_(unknown_fields) {}
249
virtual ~UnknownFieldSetFieldSkipper() {}
251
// implements FieldSkipper -----------------------------------------
252
virtual bool SkipField(io::CodedInputStream* input, uint32 tag);
253
virtual bool SkipMessage(io::CodedInputStream* input);
254
virtual void SkipUnknownEnum(int field_number, int value);
257
UnknownFieldSet* unknown_fields_;
260
// inline methods ====================================================
262
inline WireFormatLite::WireType WireFormat::WireTypeForField(
263
const FieldDescriptor* field) {
264
if (field->options().packed()) {
265
return WireFormatLite::WIRETYPE_LENGTH_DELIMITED;
267
return WireTypeForFieldType(field->type());
271
inline WireFormatLite::WireType WireFormat::WireTypeForFieldType(
272
FieldDescriptor::Type type) {
273
// Some compilers don't like enum -> enum casts, so we implicit_cast to
275
return WireFormatLite::WireTypeForFieldType(
276
static_cast<WireFormatLite::FieldType>(
277
implicit_cast<int>(type)));
280
inline uint32 WireFormat::MakeTag(const FieldDescriptor* field) {
281
return WireFormatLite::MakeTag(field->number(), WireTypeForField(field));
284
inline int WireFormat::TagSize(int field_number, FieldDescriptor::Type type) {
285
// Some compilers don't like enum -> enum casts, so we implicit_cast to
287
return WireFormatLite::TagSize(field_number,
288
static_cast<WireFormatLite::FieldType>(
289
implicit_cast<int>(type)));
292
inline void WireFormat::VerifyUTF8String(const char* data, int size,
293
WireFormat::Operation op) {
294
#ifdef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
295
WireFormat::VerifyUTF8StringFallback(data, size, op);
300
} // namespace internal
301
} // namespace protobuf
303
} // namespace google
304
#endif // GOOGLE_PROTOBUF_WIRE_FORMAT_H__