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Viewing File: wire_format.py
# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc. All rights reserved.
#
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file or at
# https://developers.google.com/open-source/licenses/bsd
"""Constants and static functions to support protocol buffer wire format."""
__author__ = 'robinson@google.com (Will Robinson)'
import struct
from google.protobuf import descriptor
from google.protobuf import message
TAG_TYPE_BITS = 3 # Number of bits used to hold type info in a proto tag.
TAG_TYPE_MASK = (1 << TAG_TYPE_BITS) - 1 # 0x7
# These numbers identify the wire type of a protocol buffer value.
# We use the least-significant TAG_TYPE_BITS bits of the varint-encoded
# tag-and-type to store one of these WIRETYPE_* constants.
# These values must match WireType enum in //google/protobuf/wire_format.h.
WIRETYPE_VARINT = 0
WIRETYPE_FIXED64 = 1
WIRETYPE_LENGTH_DELIMITED = 2
WIRETYPE_START_GROUP = 3
WIRETYPE_END_GROUP = 4
WIRETYPE_FIXED32 = 5
_WIRETYPE_MAX = 5
# Bounds for various integer types.
INT32_MAX = int((1 << 31) - 1)
INT32_MIN = int(-(1 << 31))
UINT32_MAX = (1 << 32) - 1
INT64_MAX = (1 << 63) - 1
INT64_MIN = -(1 << 63)
UINT64_MAX = (1 << 64) - 1
# "struct" format strings that will encode/decode the specified formats.
FORMAT_UINT32_LITTLE_ENDIAN = '<I'
FORMAT_UINT64_LITTLE_ENDIAN = '<Q'
FORMAT_FLOAT_LITTLE_ENDIAN = '<f'
FORMAT_DOUBLE_LITTLE_ENDIAN = '<d'
# We'll have to provide alternate implementations of AppendLittleEndian*() on
# any architectures where these checks fail.
if struct.calcsize(FORMAT_UINT32_LITTLE_ENDIAN) != 4:
raise AssertionError('Format "I" is not a 32-bit number.')
if struct.calcsize(FORMAT_UINT64_LITTLE_ENDIAN) != 8:
raise AssertionError('Format "Q" is not a 64-bit number.')
def PackTag(field_number, wire_type):
"""Returns an unsigned 32-bit integer that encodes the field number and
wire type information in standard protocol message wire format.
Args:
field_number: Expected to be an integer in the range [1, 1 << 29)
wire_type: One of the WIRETYPE_* constants.
"""
if not 0 <= wire_type <= _WIRETYPE_MAX:
raise message.EncodeError('Unknown wire type: %d' % wire_type)
return (field_number << TAG_TYPE_BITS) | wire_type
def UnpackTag(tag):
"""The inverse of PackTag(). Given an unsigned 32-bit number,
returns a (field_number, wire_type) tuple.
"""
return (tag >> TAG_TYPE_BITS), (tag & TAG_TYPE_MASK)
def ZigZagEncode(value):
"""ZigZag Transform: Encodes signed integers so that they can be
effectively used with varint encoding. See wire_format.h for
more details.
"""
if value >= 0:
return value << 1
return (value << 1) ^ (~0)
def ZigZagDecode(value):
"""Inverse of ZigZagEncode()."""
if not value & 0x1:
return value >> 1
return (value >> 1) ^ (~0)
# The *ByteSize() functions below return the number of bytes required to
# serialize "field number + type" information and then serialize the value.
def Int32ByteSize(field_number, int32):
return Int64ByteSize(field_number, int32)
def Int32ByteSizeNoTag(int32):
return _VarUInt64ByteSizeNoTag(0xffffffffffffffff & int32)
def Int64ByteSize(field_number, int64):
# Have to convert to uint before calling UInt64ByteSize().
return UInt64ByteSize(field_number, 0xffffffffffffffff & int64)
def UInt32ByteSize(field_number, uint32):
return UInt64ByteSize(field_number, uint32)
def UInt64ByteSize(field_number, uint64):
return TagByteSize(field_number) + _VarUInt64ByteSizeNoTag(uint64)
def SInt32ByteSize(field_number, int32):
return UInt32ByteSize(field_number, ZigZagEncode(int32))
def SInt64ByteSize(field_number, int64):
return UInt64ByteSize(field_number, ZigZagEncode(int64))
def Fixed32ByteSize(field_number, fixed32):
return TagByteSize(field_number) + 4
def Fixed64ByteSize(field_number, fixed64):
return TagByteSize(field_number) + 8
def SFixed32ByteSize(field_number, sfixed32):
return TagByteSize(field_number) + 4
def SFixed64ByteSize(field_number, sfixed64):
return TagByteSize(field_number) + 8
def FloatByteSize(field_number, flt):
return TagByteSize(field_number) + 4
def DoubleByteSize(field_number, double):
return TagByteSize(field_number) + 8
def BoolByteSize(field_number, b):
return TagByteSize(field_number) + 1
def EnumByteSize(field_number, enum):
return UInt32ByteSize(field_number, enum)
def StringByteSize(field_number, string):
return BytesByteSize(field_number, string.encode('utf-8'))
def BytesByteSize(field_number, b):
return (TagByteSize(field_number)
+ _VarUInt64ByteSizeNoTag(len(b))
+ len(b))
def GroupByteSize(field_number, message):
return (2 * TagByteSize(field_number) # START and END group.
+ message.ByteSize())
def MessageByteSize(field_number, message):
return (TagByteSize(field_number)
+ _VarUInt64ByteSizeNoTag(message.ByteSize())
+ message.ByteSize())
def MessageSetItemByteSize(field_number, msg):
# First compute the sizes of the tags.
# There are 2 tags for the beginning and ending of the repeated group, that
# is field number 1, one with field number 2 (type_id) and one with field
# number 3 (message).
total_size = (2 * TagByteSize(1) + TagByteSize(2) + TagByteSize(3))
# Add the number of bytes for type_id.
total_size += _VarUInt64ByteSizeNoTag(field_number)
message_size = msg.ByteSize()
# The number of bytes for encoding the length of the message.
total_size += _VarUInt64ByteSizeNoTag(message_size)
# The size of the message.
total_size += message_size
return total_size
def TagByteSize(field_number):
"""Returns the bytes required to serialize a tag with this field number."""
# Just pass in type 0, since the type won't affect the tag+type size.
return _VarUInt64ByteSizeNoTag(PackTag(field_number, 0))
# Private helper function for the *ByteSize() functions above.
def _VarUInt64ByteSizeNoTag(uint64):
"""Returns the number of bytes required to serialize a single varint
using boundary value comparisons. (unrolled loop optimization -WPierce)
uint64 must be unsigned.
"""
if uint64 <= 0x7f: return 1
if uint64 <= 0x3fff: return 2
if uint64 <= 0x1fffff: return 3
if uint64 <= 0xfffffff: return 4
if uint64 <= 0x7ffffffff: return 5
if uint64 <= 0x3ffffffffff: return 6
if uint64 <= 0x1ffffffffffff: return 7
if uint64 <= 0xffffffffffffff: return 8
if uint64 <= 0x7fffffffffffffff: return 9
if uint64 > UINT64_MAX:
raise message.EncodeError('Value out of range: %d' % uint64)
return 10
NON_PACKABLE_TYPES = (
descriptor.FieldDescriptor.TYPE_STRING,
descriptor.FieldDescriptor.TYPE_GROUP,
descriptor.FieldDescriptor.TYPE_MESSAGE,
descriptor.FieldDescriptor.TYPE_BYTES
)
def IsTypePackable(field_type):
"""Return true iff packable = true is valid for fields of this type.
Args:
field_type: a FieldDescriptor::Type value.
Returns:
True iff fields of this type are packable.
"""
return field_type not in NON_PACKABLE_TYPES
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