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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <algorithm>
#include <array>
#include <cstring>
#include <span>
#include <catch2/catch.hpp>
#include "common/common_types.h"
#include "common/scratch_buffer.h"
namespace Common {
TEST_CASE("ScratchBuffer: Basic Test", "[common]") {
ScratchBuffer<u8> buf;
REQUIRE(buf.size() == 0U);
REQUIRE(buf.capacity() == 0U);
std::array<u8, 10> payload;
payload.fill(66);
buf.resize(payload.size());
REQUIRE(buf.size() == payload.size());
REQUIRE(buf.capacity() == payload.size());
std::memcpy(buf.data(), payload.data(), payload.size());
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
}
TEST_CASE("ScratchBuffer: resize_destructive Grow", "[common]") {
std::array<u8, 10> payload;
payload.fill(66);
ScratchBuffer<u8> buf(payload.size());
REQUIRE(buf.size() == payload.size());
REQUIRE(buf.capacity() == payload.size());
// Increasing the size should reallocate the buffer
buf.resize_destructive(payload.size() * 2);
REQUIRE(buf.size() == payload.size() * 2);
REQUIRE(buf.capacity() == payload.size() * 2);
// Since the buffer is not value initialized, reading its data will be garbage
}
TEST_CASE("ScratchBuffer: resize_destructive Shrink", "[common]") {
std::array<u8, 10> payload;
payload.fill(66);
ScratchBuffer<u8> buf(payload.size());
REQUIRE(buf.size() == payload.size());
REQUIRE(buf.capacity() == payload.size());
std::memcpy(buf.data(), payload.data(), payload.size());
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
// Decreasing the size should not cause a buffer reallocation
// This can be tested by ensuring the buffer capacity and data has not changed,
buf.resize_destructive(1U);
REQUIRE(buf.size() == 1U);
REQUIRE(buf.capacity() == payload.size());
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
}
TEST_CASE("ScratchBuffer: resize Grow u8", "[common]") {
std::array<u8, 10> payload;
payload.fill(66);
ScratchBuffer<u8> buf(payload.size());
REQUIRE(buf.size() == payload.size());
REQUIRE(buf.capacity() == payload.size());
std::memcpy(buf.data(), payload.data(), payload.size());
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
// Increasing the size should reallocate the buffer
buf.resize(payload.size() * 2);
REQUIRE(buf.size() == payload.size() * 2);
REQUIRE(buf.capacity() == payload.size() * 2);
// resize() keeps the previous data intact
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
}
TEST_CASE("ScratchBuffer: resize Grow u64", "[common]") {
std::array<u64, 10> payload;
payload.fill(6666);
ScratchBuffer<u64> buf(payload.size());
REQUIRE(buf.size() == payload.size());
REQUIRE(buf.capacity() == payload.size());
std::memcpy(buf.data(), payload.data(), payload.size() * sizeof(u64));
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
// Increasing the size should reallocate the buffer
buf.resize(payload.size() * 2);
REQUIRE(buf.size() == payload.size() * 2);
REQUIRE(buf.capacity() == payload.size() * 2);
// resize() keeps the previous data intact
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
}
TEST_CASE("ScratchBuffer: resize Shrink", "[common]") {
std::array<u8, 10> payload;
payload.fill(66);
ScratchBuffer<u8> buf(payload.size());
REQUIRE(buf.size() == payload.size());
REQUIRE(buf.capacity() == payload.size());
std::memcpy(buf.data(), payload.data(), payload.size());
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
// Decreasing the size should not cause a buffer reallocation
// This can be tested by ensuring the buffer capacity and data has not changed,
buf.resize(1U);
REQUIRE(buf.size() == 1U);
REQUIRE(buf.capacity() == payload.size());
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
}
TEST_CASE("ScratchBuffer: Span Size", "[common]") {
std::array<u8, 10> payload;
payload.fill(66);
ScratchBuffer<u8> buf(payload.size());
REQUIRE(buf.size() == payload.size());
REQUIRE(buf.capacity() == payload.size());
std::memcpy(buf.data(), payload.data(), payload.size());
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
buf.resize(3U);
REQUIRE(buf.size() == 3U);
REQUIRE(buf.capacity() == payload.size());
const auto buf_span = std::span<u8>(buf);
// The span size is the last requested size of the buffer, not its capacity
REQUIRE(buf_span.size() == buf.size());
for (size_t i = 0; i < buf_span.size(); ++i) {
REQUIRE(buf_span[i] == buf[i]);
REQUIRE(buf_span[i] == payload[i]);
}
}
TEST_CASE("ScratchBuffer: Span Writes", "[common]") {
std::array<u8, 10> payload;
payload.fill(66);
ScratchBuffer<u8> buf(payload.size());
REQUIRE(buf.size() == payload.size());
REQUIRE(buf.capacity() == payload.size());
std::memcpy(buf.data(), payload.data(), payload.size());
for (size_t i = 0; i < payload.size(); ++i) {
REQUIRE(buf[i] == payload[i]);
}
buf.resize(3U);
REQUIRE(buf.size() == 3U);
REQUIRE(buf.capacity() == payload.size());
const auto buf_span = std::span<u8>(buf);
REQUIRE(buf_span.size() == buf.size());
for (size_t i = 0; i < buf_span.size(); ++i) {
const auto new_value = static_cast<u8>(i + 1U);
// Writes to a span of the scratch buffer will propogate to the buffer itself
buf_span[i] = new_value;
REQUIRE(buf[i] == new_value);
}
}
} // namespace Common
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