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Added support for size prefixed buffers.

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These are useful for streaming FlatBuffers. The functionality
ensures proper alignment of the whole buffer.

Tested: on OS X.
Bug: 27123865

Change-Id: Ic7d75a618c1bb470ea44c4dcf202ff71f2b3f4f1
Signed-off-by: Wouter van Oortmerssen <wvo@google.com>
This commit is contained in:
Wouter van Oortmerssen
2016-10-10 15:55:26 -07:00
parent ab51b03093
commit 486c048a0d
2 changed files with 87 additions and 18 deletions
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21
tests/test.cpp
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@@ -396,6 +396,25 @@ void ObjectFlatBuffersTest(uint8_t *flatbuf) {
TEST_EQ(tests[1].b(), 40);
}
// Prefix a FlatBuffer with a size field.
void SizePrefixedTest() {
// Create size prefixed buffer.
flatbuffers::FlatBufferBuilder fbb;
fbb.FinishSizePrefixed(CreateMonster(fbb, 0, 200, 300,
fbb.CreateString("bob")));
// Verify it.
flatbuffers::Verifier verifier(fbb.GetBufferPointer(), fbb.GetSize());
TEST_EQ(verifier.VerifySizePrefixedBuffer<Monster>(nullptr), true);
// Access it.
auto m = flatbuffers::GetSizePrefixedRoot<MyGame::Example::Monster>(
fbb.GetBufferPointer());
TEST_EQ(m->mana(), 200);
TEST_EQ(m->hp(), 300);
TEST_EQ_STR(m->name()->c_str(), "bob");
}
// example of parsing text straight into a buffer, and generating
// text back from it:
void ParseAndGenerateTextTest() {
@@ -1242,6 +1261,8 @@ int main(int /*argc*/, const char * /*argv*/[]) {
ObjectFlatBuffersTest(flatbuf.get());
SizePrefixedTest();
#ifndef FLATBUFFERS_NO_FILE_TESTS
ParseAndGenerateTextTest();
ReflectionTest(flatbuf.get(), rawbuf.length());