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#include "alignment_test.h"
#include "tests/alignment_test_generated.h"
#include "flatbuffers/flatbuffer_builder.h"
#include "flatbuffers/util.h"
#include "test_assert.h"
namespace flatbuffers {
namespace tests {
void AlignmentTest() {
FlatBufferBuilder builder;
BadAlignmentLarge large;
Offset<OuterLarge> outer_large = CreateOuterLarge(builder, &large);
BadAlignmentSmall *small;
Offset<Vector<const BadAlignmentSmall *>> small_offset =
builder.CreateUninitializedVectorOfStructs(9, &small);
(void)small; // We do not have to write data to trigger the test failure
Offset<BadAlignmentRoot> root =
CreateBadAlignmentRoot(builder, outer_large, small_offset);
builder.Finish(root);
Verifier verifier(builder.GetBufferPointer(), builder.GetSize());
TEST_ASSERT(verifier.VerifyBuffer<BadAlignmentRoot>(nullptr));
// ============= Test Small Structs Vector misalignment ========
builder.Clear();
// creating 5 structs with 2 bytes each
// 10 bytes in total for Vector data is needed
std::vector<EvenSmallStruct> even_vector = { { 2, 1 }, { 3, 1 }, { 4, 1 } };
std::vector<OddSmallStruct> odd_vector = { { 6, 5, 4 },
{ 9, 8, 7 },
{ 1, 2, 3 } };
// CreateVectorOfStructs is used in the generated CreateSmallStructsDirect()
// method, but we test it directly
Offset<Vector<const EvenSmallStruct *>> even_structs_offset =
builder.CreateVectorOfStructs<EvenSmallStruct>(even_vector);
Offset<Vector<const OddSmallStruct *>> odd_structs_offset =
builder.CreateVectorOfStructs<OddSmallStruct>(odd_vector);
Offset<SmallStructs> small_structs_root =
CreateSmallStructs(builder, even_structs_offset, odd_structs_offset);
builder.Finish(small_structs_root);
// Save the binary that we later can annotate with `flatc --annotate` command
// NOTE: the conversion of the JSON data to --binary via `flatc --binary`
// command is not changed with that fix and was always producing the
// correct binary data.
// SaveFile("alignment_test_{before,after}_fix.bin",
// reinterpret_cast<char *>(builder.GetBufferPointer()),
// builder.GetSize(), true);
Verifier verifier_small_structs(builder.GetBufferPointer(),
builder.GetSize());
TEST_ASSERT(verifier_small_structs.VerifyBuffer<SmallStructs>(nullptr));
// Reading SmallStructs vector values back and compare with original
auto root_msg =
flatbuffers::GetRoot<SmallStructs>(builder.GetBufferPointer());
TEST_EQ(root_msg->even_structs()->size(), even_vector.size());
for (flatbuffers::uoffset_t i = 0; i < root_msg->even_structs()->size();
++i) {
TEST_EQ(even_vector[i].var_0(), root_msg->even_structs()->Get(i)->var_0());
TEST_EQ(even_vector[i].var_1(), root_msg->even_structs()->Get(i)->var_1());
}
TEST_EQ(root_msg->odd_structs()->size(), even_vector.size());
for (flatbuffers::uoffset_t i = 0; i < root_msg->odd_structs()->size(); ++i) {
TEST_EQ(odd_vector[i].var_0(), root_msg->odd_structs()->Get(i)->var_0());
TEST_EQ(odd_vector[i].var_1(), root_msg->odd_structs()->Get(i)->var_1());
}
}
} // namespace tests
} // namespace flatbuffers
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