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// Copyright 2018 Bert Belder <bertbelder@gmail.com>
// All rights reserved. MIT License.
#include <stdint.h>
#include "testing/gtest/include/gtest/gtest.h"
#include "deno.h"
#include "flatbuffer_builder.h"
template <typename T, std::size_t N>
constexpr std::size_t countof(T const (&)[N]) noexcept {
return N;
}
TEST(FlatBufferBuilderTest, ExportBuf) {
const uint32_t nums[] = {1, 2, 3};
const char str[] = "hello mars";
deno_buf nums_buf;
deno_buf str_buf;
// Use scope so builder gets destroyed after building buffers.
{
deno::FlatBufferBuilder builder;
// Build first flatbuffer.
auto nums_fb = builder.CreateVector(nums, countof(nums));
builder.Finish(nums_fb);
nums_buf = builder.ExportBuf();
// Reset builder.
builder.Reset();
// Build second flatbuffer using the same builder.
auto str_fb = builder.CreateString(str);
builder.Finish(str_fb);
str_buf = builder.ExportBuf();
}
// Allocations should be different.
EXPECT_NE(nums_buf.alloc_ptr, str_buf.alloc_ptr);
// Logical buffer data should be contained inside their allocations.
EXPECT_GE(nums_buf.data_ptr, nums_buf.alloc_ptr);
EXPECT_LE(nums_buf.data_ptr + nums_buf.data_len,
nums_buf.alloc_ptr + nums_buf.alloc_len);
EXPECT_GE(str_buf.data_ptr, str_buf.alloc_ptr);
EXPECT_LE(str_buf.data_ptr + str_buf.data_len,
str_buf.alloc_ptr + str_buf.alloc_len);
// Since there is no way to parse these buffers without generating code,
// just check whether the data is contained in the raw content.
// Both the numbers vector and the string start at offset 8 in the flatbuffer.
auto nums_data = reinterpret_cast<uint32_t*>(nums_buf.data_ptr + 8);
for (size_t i = 0; i < countof(nums); i++) {
EXPECT_EQ(nums_data[i], nums[i]);
}
auto str_data = str_buf.data_ptr + 8;
for (size_t i = 0; i < countof(str); i++) {
EXPECT_EQ(str_data[i], str[i]);
}
}
TEST(FlatBufferBuilderTest, CanGrowBuffer) {
static const size_t kSmallInitialSize = 32;
static const char zeroes[1024] = {0};
{
// Create buffer with small initial size.
deno::FlatBufferBuilder builder(kSmallInitialSize);
// Write 1 byte and export buffer.
builder.Finish(builder.CreateVector(zeroes, 1));
auto buf = builder.ExportBuf();
// Exported buffer should have initial size.
EXPECT_EQ(buf.alloc_len, kSmallInitialSize);
}
{
// Create buffer with small initial size.
deno::FlatBufferBuilder builder(kSmallInitialSize);
// Write 1024 bytes and export buffer.
builder.Finish(builder.CreateVector(zeroes, countof(zeroes)));
auto buf = builder.ExportBuf();
// Exported buffer have grown.
EXPECT_GT(buf.alloc_len, kSmallInitialSize);
}
}
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