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d � Z d � Z d � Z d � Z d � Z d � Z! d � Z" d � Z# d � Z$ e# � Z% e$ � Z& d � Z' d � Z( d � Z) d � Z* d � Z+ d � Z, e) e j- e& e � Z. Z/ Z0 e) e j- e% e � Z1 Z2 e* e j- e% e e j � Z3 Z4 e+ e j5 d � Z6 e+ e j7 d � Z8 e+ e j5 d � Z9 e+ e j7 d � Z: e, e j5 d! � Z; e, e j7 d" � Z< d# � Z= d$ � Z> d% � Z? d& � Z@ d' � ZA d( � ZB d) � ZC d S(* s� 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 BytesIO.
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.
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number.i ( R R t PackTag( t field_number( ( sD /usr/lib/python2.7/site-packages/google/protobuf/internal/encoder.pyt _TagSizeo s c s � f d � } | S( s� A sizer which uses the function compute_value_size to compute the size of
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The message set message looks like this:
message MessageSet {
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d � } | S( sK Return an encoder for a basic signed varint value (does not include
tag).c S sx | d k r | d 7} n | d @} | d L} x5 | rd | t j d | B� � | d @} | d L} q0 W| t j | � � S( Ni i i@ i i i� l ( R0 R1 ( R2 R R3 R4 ( ( sD /usr/lib/python2.7/site-packages/google/protobuf/internal/encoder.pyt EncodeSignedVarint� s
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called at startup time so it doesn't need to be fast.t ( t
_EncodeVarintt appendt Truet join( R t pieces( ( sD /usr/lib/python2.7/site-packages/google/protobuf/internal/encoder.pyt _VarintBytes� s c C s t j t t j | | � � � S( sC Encode the given tag and return the bytes. Only called at startup.( R0 t binary_typeR? R R ( R t wire_type( ( sD /usr/lib/python2.7/site-packages/google/protobuf/internal/encoder.pyt TagBytes� s c s � � � f d � } | S( s_ Return a constructor for an encoder for fields of a particular type.
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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().
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Args:
wire_type: The field's wire type, for encoding tags.
format: The format string to pass to struct.pack().
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( t structt packRB R RK R: ( R R R RH RI RJ ( RO R RA ( RF RP RG sD /usr/lib/python2.7/site-packages/google/protobuf/internal/encoder.pyRL s ( RQ t calcsize( RA RO RL ( ( RO R RA sD /usr/lib/python2.7/site-packages/google/protobuf/internal/encoder.pyt _StructPackEncoder� s c sk t j � � � � d k r' d � � n( � d k r? d � � n t d � � � � � � � f d � } | S( sq 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().
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N( RB R RK R: ( R R R RI RJ ( ( RF R` sD /usr/lib/python2.7/site-packages/google/protobuf/internal/encoder.pyt MessageEncoder� s c sv d j t d t j � t d t j � t | � t d t j � g � � t d t j � � t � � � � f d � } | S( s� 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;
}
}
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( R= RB R Rf R] R? RK Rg R: ( R RJ ( ( Rj RF Rk sD /usr/lib/python2.7/site-packages/google/protobuf/internal/encoder.pyt MessageSetItemEncoder s c s4 | j � t | j t t � � � � f d � } | S( s� Encoder for extensions of MessageSet.
Maps always have a wire format like this:
message MapEntry {
key_type key = 1;
value_type value = 2;
}
repeated MapEntry map = N;
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Int32Sizert
Int64Sizert EnumSizert UInt32Sizert UInt64Sizert ZigZagEncodet SInt32Sizert SInt64Sizert Fixed32Sizert
SFixed32Sizert
FloatSizert Fixed64Sizert
SFixed64Sizert DoubleSizert BoolSizerR R R R! R# R/ R6 R8 R: t _EncodeSignedVarintR? RB RM RN RT RZ R] t Int32Encodert Int64Encodert EnumEncodert
UInt32Encodert
UInt64Encodert
SInt32Encodert
SInt64Encodert WIRETYPE_FIXED32t Fixed32Encodert WIRETYPE_FIXED64t Fixed64Encodert SFixed32Encodert SFixed64Encodert FloatEncodert
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