Renamed google.protobuf to protobuf26

third_party/google/protobuf/internal/encoder.py

Index: third_party/google/protobuf/internal/encoder.py
diff --git a/third_party/google/protobuf/internal/encoder.py b/third_party/google/protobuf/internal/encoder.py
deleted file mode 100644
index 0a7c04179f1b34c64fdf527f58c62b4c61b7075c..0000000000000000000000000000000000000000
--- a/third_party/google/protobuf/internal/encoder.py
+++ /dev/null
@@ -1,788 +0,0 @@
-# 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
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#PY25 compatible for GAE.
-#
-# Copyright 2009 Google Inc. All Rights Reserved.
-
-"""Code for encoding protocol message primitives.
-
-Contains the logic for encoding every logical protocol field type
-into one of the 5 physical wire types.
-
-This code is designed to push the Python interpreter's performance to the
-limits.
-
-The basic idea is that at startup time, for every field (i.e. every
-FieldDescriptor) we construct two functions:  a "sizer" and an "encoder".  The
-sizer takes a value of this field's type and computes its byte size.  The
-encoder takes a writer function and a value.  It encodes the value into byte
-strings and invokes the writer function to write those strings.  Typically the
-writer function is the write() method of a cStringIO.
-
-We try to do as much work as possible when constructing the writer and the
-sizer rather than when calling them.  In particular:
-* We copy any needed global functions to local variables, so that we do not need
-  to do costly global table lookups at runtime.
-* Similarly, we try to do any attribute lookups at startup time if possible.
-* Every field's tag is encoded to bytes at startup, since it can't change at
-  runtime.
-* Whatever component of the field size we can compute at startup, we do.
-* We *avoid* sharing code if doing so would make the code slower and not sharing
-  does not burden us too much.  For example, encoders for repeated fields do
-  not just call the encoders for singular fields in a loop because this would
-  add an extra function call overhead for every loop iteration; instead, we
-  manually inline the single-value encoder into the loop.
-* If a Python function lacks a return statement, Python actually generates
-  instructions to pop the result of the last statement off the stack, push
-  None onto the stack, and then return that.  If we really don't care what
-  value is returned, then we can save two instructions by returning the
-  result of the last statement.  It looks funny but it helps.
-* We assume that type and bounds checking has happened at a higher level.
-"""
-
-__author__ = 'kenton@google.com (Kenton Varda)'
-
-import struct
-import sys  ##PY25
-_PY2 = sys.version_info[0] < 3  ##PY25
-from google.protobuf.internal import wire_format
-
-
-# This will overflow and thus become IEEE-754 "infinity".  We would use
-# "float('inf')" but it doesn't work on Windows pre-Python-2.6.
-_POS_INF = 1e10000
-_NEG_INF = -_POS_INF
-
-
-def _VarintSize(value):
-  """Compute the size of a varint value."""
-  if value <= 0x7f: return 1
-  if value <= 0x3fff: return 2
-  if value <= 0x1fffff: return 3
-  if value <= 0xfffffff: return 4
-  if value <= 0x7ffffffff: return 5
-  if value <= 0x3ffffffffff: return 6
-  if value <= 0x1ffffffffffff: return 7
-  if value <= 0xffffffffffffff: return 8
-  if value <= 0x7fffffffffffffff: return 9
-  return 10
-
-
-def _SignedVarintSize(value):
-  """Compute the size of a signed varint value."""
-  if value < 0: return 10
-  if value <= 0x7f: return 1
-  if value <= 0x3fff: return 2
-  if value <= 0x1fffff: return 3
-  if value <= 0xfffffff: return 4
-  if value <= 0x7ffffffff: return 5
-  if value <= 0x3ffffffffff: return 6
-  if value <= 0x1ffffffffffff: return 7
-  if value <= 0xffffffffffffff: return 8
-  if value <= 0x7fffffffffffffff: return 9
-  return 10
-
-
-def _TagSize(field_number):
-  """Returns the number of 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 _VarintSize(wire_format.PackTag(field_number, 0))
-
-
-# --------------------------------------------------------------------
-# In this section we define some generic sizers.  Each of these functions
-# takes parameters specific to a particular field type, e.g. int32 or fixed64.
-# It returns another function which in turn takes parameters specific to a
-# particular field, e.g. the field number and whether it is repeated or packed.
-# Look at the next section to see how these are used.
-
-
-def _SimpleSizer(compute_value_size):
-  """A sizer which uses the function compute_value_size to compute the size of
-  each value.  Typically compute_value_size is _VarintSize."""
-
-  def SpecificSizer(field_number, is_repeated, is_packed):
-    tag_size = _TagSize(field_number)
-    if is_packed:
-      local_VarintSize = _VarintSize
-      def PackedFieldSize(value):
-        result = 0
-        for element in value:
-          result += compute_value_size(element)
-        return result + local_VarintSize(result) + tag_size
-      return PackedFieldSize
-    elif is_repeated:
-      def RepeatedFieldSize(value):
-        result = tag_size * len(value)
-        for element in value:
-          result += compute_value_size(element)
-        return result
-      return RepeatedFieldSize
-    else:
-      def FieldSize(value):
-        return tag_size + compute_value_size(value)
-      return FieldSize
-
-  return SpecificSizer
-
-
-def _ModifiedSizer(compute_value_size, modify_value):
-  """Like SimpleSizer, but modify_value is invoked on each value before it is
-  passed to compute_value_size.  modify_value is typically ZigZagEncode."""
-
-  def SpecificSizer(field_number, is_repeated, is_packed):
-    tag_size = _TagSize(field_number)
-    if is_packed:
-      local_VarintSize = _VarintSize
-      def PackedFieldSize(value):
-        result = 0
-        for element in value:
-          result += compute_value_size(modify_value(element))
-        return result + local_VarintSize(result) + tag_size
-      return PackedFieldSize
-    elif is_repeated:
-      def RepeatedFieldSize(value):
-        result = tag_size * len(value)
-        for element in value:
-          result += compute_value_size(modify_value(element))
-        return result
-      return RepeatedFieldSize
-    else:
-      def FieldSize(value):
-        return tag_size + compute_value_size(modify_value(value))
-      return FieldSize
-
-  return SpecificSizer
-
-
-def _FixedSizer(value_size):
-  """Like _SimpleSizer except for a fixed-size field.  The input is the size
-  of one value."""
-
-  def SpecificSizer(field_number, is_repeated, is_packed):
-    tag_size = _TagSize(field_number)
-    if is_packed:
-      local_VarintSize = _VarintSize
-      def PackedFieldSize(value):
-        result = len(value) * value_size
-        return result + local_VarintSize(result) + tag_size
-      return PackedFieldSize
-    elif is_repeated:
-      element_size = value_size + tag_size
-      def RepeatedFieldSize(value):
-        return len(value) * element_size
-      return RepeatedFieldSize
-    else:
-      field_size = value_size + tag_size
-      def FieldSize(value):
-        return field_size
-      return FieldSize
-
-  return SpecificSizer
-
-
-# ====================================================================
-# Here we declare a sizer constructor for each field type.  Each "sizer
-# constructor" is a function that takes (field_number, is_repeated, is_packed)
-# as parameters and returns a sizer, which in turn takes a field value as
-# a parameter and returns its encoded size.
-
-
-Int32Sizer = Int64Sizer = EnumSizer = _SimpleSizer(_SignedVarintSize)
-
-UInt32Sizer = UInt64Sizer = _SimpleSizer(_VarintSize)
-
-SInt32Sizer = SInt64Sizer = _ModifiedSizer(
-    _SignedVarintSize, wire_format.ZigZagEncode)
-
-Fixed32Sizer = SFixed32Sizer = FloatSizer  = _FixedSizer(4)
-Fixed64Sizer = SFixed64Sizer = DoubleSizer = _FixedSizer(8)
-
-BoolSizer = _FixedSizer(1)
-
-
-def StringSizer(field_number, is_repeated, is_packed):
-  """Returns a sizer for a string field."""
-
-  tag_size = _TagSize(field_number)
-  local_VarintSize = _VarintSize
-  local_len = len
-  assert not is_packed
-  if is_repeated:
-    def RepeatedFieldSize(value):
-      result = tag_size * len(value)
-      for element in value:
-        l = local_len(element.encode('utf-8'))
-        result += local_VarintSize(l) + l
-      return result
-    return RepeatedFieldSize
-  else:
-    def FieldSize(value):
-      l = local_len(value.encode('utf-8'))
-      return tag_size + local_VarintSize(l) + l
-    return FieldSize
-
-
-def BytesSizer(field_number, is_repeated, is_packed):
-  """Returns a sizer for a bytes field."""
-
-  tag_size = _TagSize(field_number)
-  local_VarintSize = _VarintSize
-  local_len = len
-  assert not is_packed
-  if is_repeated:
-    def RepeatedFieldSize(value):
-      result = tag_size * len(value)
-      for element in value:
-        l = local_len(element)
-        result += local_VarintSize(l) + l
-      return result
-    return RepeatedFieldSize
-  else:
-    def FieldSize(value):
-      l = local_len(value)
-      return tag_size + local_VarintSize(l) + l
-    return FieldSize
-
-
-def GroupSizer(field_number, is_repeated, is_packed):
-  """Returns a sizer for a group field."""
-
-  tag_size = _TagSize(field_number) * 2
-  assert not is_packed
-  if is_repeated:
-    def RepeatedFieldSize(value):
-      result = tag_size * len(value)
-      for element in value:
-        result += element.ByteSize()
-      return result
-    return RepeatedFieldSize
-  else:
-    def FieldSize(value):
-      return tag_size + value.ByteSize()
-    return FieldSize
-
-
-def MessageSizer(field_number, is_repeated, is_packed):
-  """Returns a sizer for a message field."""
-
-  tag_size = _TagSize(field_number)
-  local_VarintSize = _VarintSize
-  assert not is_packed
-  if is_repeated:
-    def RepeatedFieldSize(value):
-      result = tag_size * len(value)
-      for element in value:
-        l = element.ByteSize()
-        result += local_VarintSize(l) + l
-      return result
-    return RepeatedFieldSize
-  else:
-    def FieldSize(value):
-      l = value.ByteSize()
-      return tag_size + local_VarintSize(l) + l
-    return FieldSize
-
-
-# --------------------------------------------------------------------
-# MessageSet is special.
-
-
-def MessageSetItemSizer(field_number):
-  """Returns a sizer for extensions of MessageSet.
-
-  The message set message looks like this:
-    message MessageSet {
-      repeated group Item = 1 {
-        required int32 type_id = 2;
-        required string message = 3;
-      }
-    }
-  """
-  static_size = (_TagSize(1) * 2 + _TagSize(2) + _VarintSize(field_number) +
-                 _TagSize(3))
-  local_VarintSize = _VarintSize
-
-  def FieldSize(value):
-    l = value.ByteSize()
-    return static_size + local_VarintSize(l) + l
-
-  return FieldSize
-
-
-# ====================================================================
-# Encoders!
-
-
-def _VarintEncoder():
-  """Return an encoder for a basic varint value (does not include tag)."""
-
-  local_chr = _PY2 and chr or (lambda x: bytes((x,)))  ##PY25
-##!PY25  local_chr = chr if bytes is str else lambda x: bytes((x,))
-  def EncodeVarint(write, value):
-    bits = value & 0x7f
-    value >>= 7
-    while value:
-      write(local_chr(0x80|bits))
-      bits = value & 0x7f
-      value >>= 7
-    return write(local_chr(bits))
-
-  return EncodeVarint
-
-
-def _SignedVarintEncoder():
-  """Return an encoder for a basic signed varint value (does not include
-  tag)."""
-
-  local_chr = _PY2 and chr or (lambda x: bytes((x,)))  ##PY25
-##!PY25  local_chr = chr if bytes is str else lambda x: bytes((x,))
-  def EncodeSignedVarint(write, value):
-    if value < 0:
-      value += (1 << 64)
-    bits = value & 0x7f
-    value >>= 7
-    while value:
-      write(local_chr(0x80|bits))
-      bits = value & 0x7f
-      value >>= 7
-    return write(local_chr(bits))
-
-  return EncodeSignedVarint
-
-
-_EncodeVarint = _VarintEncoder()
-_EncodeSignedVarint = _SignedVarintEncoder()
-
-
-def _VarintBytes(value):
-  """Encode the given integer as a varint and return the bytes.  This is only
-  called at startup time so it doesn't need to be fast."""
-
-  pieces = []
-  _EncodeVarint(pieces.append, value)
-  return "".encode("latin1").join(pieces)  ##PY25
-##!PY25  return b"".join(pieces)
-
-
-def TagBytes(field_number, wire_type):
-  """Encode the given tag and return the bytes.  Only called at startup."""
-
-  return _VarintBytes(wire_format.PackTag(field_number, wire_type))
-
-# --------------------------------------------------------------------
-# As with sizers (see above), we have a number of common encoder
-# implementations.
-
-
-def _SimpleEncoder(wire_type, encode_value, compute_value_size):
-  """Return a constructor for an encoder for fields of a particular type.
-
-  Args:
-      wire_type:  The field's wire type, for encoding tags.
-      encode_value:  A function which encodes an individual value, e.g.
-        _EncodeVarint().
-      compute_value_size:  A function which computes the size of an individual
-        value, e.g. _VarintSize().
-  """
-
-  def SpecificEncoder(field_number, is_repeated, is_packed):
-    if is_packed:
-      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
-      local_EncodeVarint = _EncodeVarint
-      def EncodePackedField(write, value):
-        write(tag_bytes)
-        size = 0
-        for element in value:
-          size += compute_value_size(element)
-        local_EncodeVarint(write, size)
-        for element in value:
-          encode_value(write, element)
-      return EncodePackedField
-    elif is_repeated:
-      tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeRepeatedField(write, value):
-        for element in value:
-          write(tag_bytes)
-          encode_value(write, element)
-      return EncodeRepeatedField
-    else:
-      tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeField(write, value):
-        write(tag_bytes)
-        return encode_value(write, value)
-      return EncodeField
-
-  return SpecificEncoder
-
-
-def _ModifiedEncoder(wire_type, encode_value, compute_value_size, modify_value):
-  """Like SimpleEncoder but additionally invokes modify_value on every value
-  before passing it to encode_value.  Usually modify_value is ZigZagEncode."""
-
-  def SpecificEncoder(field_number, is_repeated, is_packed):
-    if is_packed:
-      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
-      local_EncodeVarint = _EncodeVarint
-      def EncodePackedField(write, value):
-        write(tag_bytes)
-        size = 0
-        for element in value:
-          size += compute_value_size(modify_value(element))
-        local_EncodeVarint(write, size)
-        for element in value:
-          encode_value(write, modify_value(element))
-      return EncodePackedField
-    elif is_repeated:
-      tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeRepeatedField(write, value):
-        for element in value:
-          write(tag_bytes)
-          encode_value(write, modify_value(element))
-      return EncodeRepeatedField
-    else:
-      tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeField(write, value):
-        write(tag_bytes)
-        return encode_value(write, modify_value(value))
-      return EncodeField
-
-  return SpecificEncoder
-
-
-def _StructPackEncoder(wire_type, format):
-  """Return a constructor for an encoder for a fixed-width field.
-
-  Args:
-      wire_type:  The field's wire type, for encoding tags.
-      format:  The format string to pass to struct.pack().
-  """
-
-  value_size = struct.calcsize(format)
-
-  def SpecificEncoder(field_number, is_repeated, is_packed):
-    local_struct_pack = struct.pack
-    if is_packed:
-      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
-      local_EncodeVarint = _EncodeVarint
-      def EncodePackedField(write, value):
-        write(tag_bytes)
-        local_EncodeVarint(write, len(value) * value_size)
-        for element in value:
-          write(local_struct_pack(format, element))
-      return EncodePackedField
-    elif is_repeated:
-      tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeRepeatedField(write, value):
-        for element in value:
-          write(tag_bytes)
-          write(local_struct_pack(format, element))
-      return EncodeRepeatedField
-    else:
-      tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeField(write, value):
-        write(tag_bytes)
-        return write(local_struct_pack(format, value))
-      return EncodeField
-
-  return SpecificEncoder
-
-
-def _FloatingPointEncoder(wire_type, format):
-  """Return a constructor for an encoder for float fields.
-
-  This is like StructPackEncoder, but catches errors that may be due to
-  passing non-finite floating-point values to struct.pack, and makes a
-  second attempt to encode those values.
-
-  Args:
-      wire_type:  The field's wire type, for encoding tags.
-      format:  The format string to pass to struct.pack().
-  """
-
-  b = _PY2 and (lambda x:x) or (lambda x:x.encode('latin1'))  ##PY25
-  value_size = struct.calcsize(format)
-  if value_size == 4:
-    def EncodeNonFiniteOrRaise(write, value):
-      # Remember that the serialized form uses little-endian byte order.
-      if value == _POS_INF:
-        write(b('\x00\x00\x80\x7F'))  ##PY25
-##!PY25        write(b'\x00\x00\x80\x7F')
-      elif value == _NEG_INF:
-        write(b('\x00\x00\x80\xFF'))  ##PY25
-##!PY25        write(b'\x00\x00\x80\xFF')
-      elif value != value:           # NaN
-        write(b('\x00\x00\xC0\x7F'))  ##PY25
-##!PY25        write(b'\x00\x00\xC0\x7F')
-      else:
-        raise
-  elif value_size == 8:
-    def EncodeNonFiniteOrRaise(write, value):
-      if value == _POS_INF:
-        write(b('\x00\x00\x00\x00\x00\x00\xF0\x7F'))  ##PY25
-##!PY25        write(b'\x00\x00\x00\x00\x00\x00\xF0\x7F')
-      elif value == _NEG_INF:
-        write(b('\x00\x00\x00\x00\x00\x00\xF0\xFF'))  ##PY25
-##!PY25        write(b'\x00\x00\x00\x00\x00\x00\xF0\xFF')
-      elif value != value:                         # NaN
-        write(b('\x00\x00\x00\x00\x00\x00\xF8\x7F'))  ##PY25
-##!PY25        write(b'\x00\x00\x00\x00\x00\x00\xF8\x7F')
-      else:
-        raise
-  else:
-    raise ValueError('Can\'t encode floating-point values that are '
-                     '%d bytes long (only 4 or 8)' % value_size)
-
-  def SpecificEncoder(field_number, is_repeated, is_packed):
-    local_struct_pack = struct.pack
-    if is_packed:
-      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
-      local_EncodeVarint = _EncodeVarint
-      def EncodePackedField(write, value):
-        write(tag_bytes)
-        local_EncodeVarint(write, len(value) * value_size)
-        for element in value:
-          # This try/except block is going to be faster than any code that
-          # we could write to check whether element is finite.
-          try:
-            write(local_struct_pack(format, element))
-          except SystemError:
-            EncodeNonFiniteOrRaise(write, element)
-      return EncodePackedField
-    elif is_repeated:
-      tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeRepeatedField(write, value):
-        for element in value:
-          write(tag_bytes)
-          try:
-            write(local_struct_pack(format, element))
-          except SystemError:
-            EncodeNonFiniteOrRaise(write, element)
-      return EncodeRepeatedField
-    else:
-      tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeField(write, value):
-        write(tag_bytes)
-        try:
-          write(local_struct_pack(format, value))
-        except SystemError:
-          EncodeNonFiniteOrRaise(write, value)
-      return EncodeField
-
-  return SpecificEncoder
-
-
-# ====================================================================
-# Here we declare an encoder constructor for each field type.  These work
-# very similarly to sizer constructors, described earlier.
-
-
-Int32Encoder = Int64Encoder = EnumEncoder = _SimpleEncoder(
-    wire_format.WIRETYPE_VARINT, _EncodeSignedVarint, _SignedVarintSize)
-
-UInt32Encoder = UInt64Encoder = _SimpleEncoder(
-    wire_format.WIRETYPE_VARINT, _EncodeVarint, _VarintSize)
-
-SInt32Encoder = SInt64Encoder = _ModifiedEncoder(
-    wire_format.WIRETYPE_VARINT, _EncodeVarint, _VarintSize,
-    wire_format.ZigZagEncode)
-
-# Note that Python conveniently guarantees that when using the '<' prefix on
-# formats, they will also have the same size across all platforms (as opposed
-# to without the prefix, where their sizes depend on the C compiler's basic
-# type sizes).
-Fixed32Encoder  = _StructPackEncoder(wire_format.WIRETYPE_FIXED32, '<I')
-Fixed64Encoder  = _StructPackEncoder(wire_format.WIRETYPE_FIXED64, '<Q')
-SFixed32Encoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED32, '<i')
-SFixed64Encoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED64, '<q')
-FloatEncoder    = _FloatingPointEncoder(wire_format.WIRETYPE_FIXED32, '<f')
-DoubleEncoder   = _FloatingPointEncoder(wire_format.WIRETYPE_FIXED64, '<d')
-
-
-def BoolEncoder(field_number, is_repeated, is_packed):
-  """Returns an encoder for a boolean field."""
-
-##!PY25  false_byte = b'\x00'
-##!PY25  true_byte = b'\x01'
-  false_byte = '\x00'.encode('latin1')  ##PY25
-  true_byte = '\x01'.encode('latin1')  ##PY25
-  if is_packed:
-    tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
-    local_EncodeVarint = _EncodeVarint
-    def EncodePackedField(write, value):
-      write(tag_bytes)
-      local_EncodeVarint(write, len(value))
-      for element in value:
-        if element:
-          write(true_byte)
-        else:
-          write(false_byte)
-    return EncodePackedField
-  elif is_repeated:
-    tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_VARINT)
-    def EncodeRepeatedField(write, value):
-      for element in value:
-        write(tag_bytes)
-        if element:
-          write(true_byte)
-        else:
-          write(false_byte)
-    return EncodeRepeatedField
-  else:
-    tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_VARINT)
-    def EncodeField(write, value):
-      write(tag_bytes)
-      if value:
-        return write(true_byte)
-      return write(false_byte)
-    return EncodeField
-
-
-def StringEncoder(field_number, is_repeated, is_packed):
-  """Returns an encoder for a string field."""
-
-  tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
-  local_EncodeVarint = _EncodeVarint
-  local_len = len
-  assert not is_packed
-  if is_repeated:
-    def EncodeRepeatedField(write, value):
-      for element in value:
-        encoded = element.encode('utf-8')
-        write(tag)
-        local_EncodeVarint(write, local_len(encoded))
-        write(encoded)
-    return EncodeRepeatedField
-  else:
-    def EncodeField(write, value):
-      encoded = value.encode('utf-8')
-      write(tag)
-      local_EncodeVarint(write, local_len(encoded))
-      return write(encoded)
-    return EncodeField
-
-
-def BytesEncoder(field_number, is_repeated, is_packed):
-  """Returns an encoder for a bytes field."""
-
-  tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
-  local_EncodeVarint = _EncodeVarint
-  local_len = len
-  assert not is_packed
-  if is_repeated:
-    def EncodeRepeatedField(write, value):
-      for element in value:
-        write(tag)
-        local_EncodeVarint(write, local_len(element))
-        write(element)
-    return EncodeRepeatedField
-  else:
-    def EncodeField(write, value):
-      write(tag)
-      local_EncodeVarint(write, local_len(value))
-      return write(value)
-    return EncodeField
-
-
-def GroupEncoder(field_number, is_repeated, is_packed):
-  """Returns an encoder for a group field."""
-
-  start_tag = TagBytes(field_number, wire_format.WIRETYPE_START_GROUP)
-  end_tag = TagBytes(field_number, wire_format.WIRETYPE_END_GROUP)
-  assert not is_packed
-  if is_repeated:
-    def EncodeRepeatedField(write, value):
-      for element in value:
-        write(start_tag)
-        element._InternalSerialize(write)
-        write(end_tag)
-    return EncodeRepeatedField
-  else:
-    def EncodeField(write, value):
-      write(start_tag)
-      value._InternalSerialize(write)
-      return write(end_tag)
-    return EncodeField
-
-
-def MessageEncoder(field_number, is_repeated, is_packed):
-  """Returns an encoder for a message field."""
-
-  tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
-  local_EncodeVarint = _EncodeVarint
-  assert not is_packed
-  if is_repeated:
-    def EncodeRepeatedField(write, value):
-      for element in value:
-        write(tag)
-        local_EncodeVarint(write, element.ByteSize())
-        element._InternalSerialize(write)
-    return EncodeRepeatedField
-  else:
-    def EncodeField(write, value):
-      write(tag)
-      local_EncodeVarint(write, value.ByteSize())
-      return value._InternalSerialize(write)
-    return EncodeField
-
-
-# --------------------------------------------------------------------
-# As before, MessageSet is special.
-
-
-def MessageSetItemEncoder(field_number):
-  """Encoder for extensions of MessageSet.
-
-  The message set message looks like this:
-    message MessageSet {
-      repeated group Item = 1 {
-        required int32 type_id = 2;
-        required string message = 3;
-      }
-    }
-  """
-  start_bytes = "".encode("latin1").join([  ##PY25
-##!PY25  start_bytes = b"".join([
-      TagBytes(1, wire_format.WIRETYPE_START_GROUP),
-      TagBytes(2, wire_format.WIRETYPE_VARINT),
-      _VarintBytes(field_number),
-      TagBytes(3, wire_format.WIRETYPE_LENGTH_DELIMITED)])
-  end_bytes = TagBytes(1, wire_format.WIRETYPE_END_GROUP)
-  local_EncodeVarint = _EncodeVarint
-
-  def EncodeField(write, value):
-    write(start_bytes)
-    local_EncodeVarint(write, value.ByteSize())
-    value._InternalSerialize(write)
-    return write(end_bytes)
-
-  return EncodeField