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Java/C#/Python prefixed size support (#4445)

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* 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 commit 68be4420dd.

* Revert "generate size-prefixed monster binary as well"

This reverts commit 2939516fdf.

* 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
This commit is contained in:
Robert Schmidtke
2018-03-12 19:30:46 +01:00
committed by Wouter van Oortmerssen
parent 6b3f057bdc
commit 08cf50c54a
24 changed files with 663 additions and 201 deletions
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22
python/flatbuffers/builder.py
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@@ -483,14 +483,32 @@ class Builder(object):
self.current_vtable[slotnum] = self.Offset()
## @endcond
def Finish(self, rootTable):
def __Finish(self, rootTable, sizePrefix):
"""Finish finalizes a buffer, pointing to the given `rootTable`."""
N.enforce_number(rootTable, N.UOffsetTFlags)
self.Prep(self.minalign, N.UOffsetTFlags.bytewidth)
prepSize = N.UOffsetTFlags.bytewidth
if sizePrefix:
prepSize += N.Int32Flags.bytewidth
self.Prep(self.minalign, prepSize)
self.PrependUOffsetTRelative(rootTable)
if sizePrefix:
size = len(self.Bytes) - self.Head()
N.enforce_number(size, N.Int32Flags)
self.PrependInt32(size)
self.finished = True
return self.Head()
def Finish(self, rootTable):
"""Finish finalizes a buffer, pointing to the given `rootTable`."""
return self.__Finish(rootTable, False)
def FinishSizePrefixed(self, rootTable):
"""
Finish finalizes a buffer, pointing to the given `rootTable`,
with the size prefixed.
"""
return self.__Finish(rootTable, True)
## @cond FLATBUFFERS_INTERNAL
def Prepend(self, flags, off):
self.Prep(flags.bytewidth, 0)