forked from BigfootDev/flatbuffers
08cf50c54a
* initial changes to support size prefixed buffers in Java * add slice equivalent to CSharp ByteBuffer * resolve TODO for slicing in CSharp code generation * add newly generated Java and CSharp test sources * fix typo in comment * add FinishSizePrefixed methods to CSharp FlatBufferBuilder as well * add option to allow writing the prefix as well * generate size-prefixed monster binary as well * extend JavaTest to test the size prefixed binary as well * use constants for size prefix length * fuse common code for getRootAs and getSizePrefixedRootAs * pulled file identifier out of if * add FinishSizePrefixed, GetSizePrefixedRootAs support for Python * Revert "extend JavaTest to test the size prefixed binary as well" This reverts commit68be4420dd. * Revert "generate size-prefixed monster binary as well" This reverts commit2939516fdf. * fix ByteBuffer.cs Slice() method; add proper CSharp and Java tests * fix unused parameter * increment version number * pulled out generated methods into separate utility class * pulled out generated methods into separate utility class for Python * fix indentation * remove unnecessary comment * fix newline and copyright * add ByteBufferUtil to csproj compilation * hide ByteBuffer's internal data; track offset into parent's array * test unsafe versions as well; compile and run in debug mode * clarify help text for size prefix * move ByteBuffer slicing behavior to subclass * fix protection levels * add size prefix support for text generation * add ByteBufferSlice to csproj compilation * revert size prefix handling for nested buffers * use duplicate instead of slice for removing size prefix * remove slice subclass and use duplicate for removing size prefix * remove slice specific tests * remove superfluous command line option
29 lines
994 B
Python
29 lines
994 B
Python
# Copyright 2017 Google Inc. All rights reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
from . import encode
|
|
from . import number_types
|
|
from . import packer
|
|
|
|
def GetSizePrefix(buf, offset):
|
|
"""Extract the size prefix from a buffer."""
|
|
return encode.Get(packer.int32, buf, offset)
|
|
|
|
def RemoveSizePrefix(buf, offset):
|
|
"""
|
|
Create a slice of a size-prefixed buffer that has
|
|
its position advanced just past the size prefix.
|
|
"""
|
|
return buf, offset + number_types.Int32Flags.bytewidth
|