test_scattered_outputs.cpp

#include "pch.h"
#include "FragmentEntry.h"

struct obj1 {
	const uint8_t x[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
};

static_assert(sizeof(obj1) == 10);

struct obj2 {
	const uint8_t x[5] = { 11, 12, 13, 14, 15 };
};

static_assert(sizeof(obj2) == 5);

obj1 buffer10;
obj2 buffer5;

static FragmentEntry fragmentBuffer[] = {
		&buffer10,
		&buffer5,
		reinterpret_cast<obj2*>(0),	// null fragment for fun
		&buffer10
};

static uint8_t buffer[120];
static void resetBuffer() {
	memset(buffer, 0xFF, sizeof(buffer));
}

TEST(outputs, fragments) {
	static_assert(4 == efi::size(fragmentBuffer));

	FragmentList fragments{ fragmentBuffer, efi::size(fragmentBuffer) };

	resetBuffer();

	{
		// Check overlap between first and second fragments
		uint8_t expected[] = {9, 10, 11, 12, 13};
		copyRange(buffer, fragments, 8, 5);
		EXPECT_TRUE( 0 == std::memcmp(buffer, expected, sizeof(expected)));
	}

	resetBuffer();

	{
		// Check partial of only second fragment
		uint8_t expected[] = {13, 14, 15};
		copyRange(buffer, fragments, 12, 3);
		EXPECT_TRUE( 0 == std::memcmp(buffer, expected, sizeof(expected)));
	}

	resetBuffer();

	{
		// Check overlap between second fragment and null fragment
		uint8_t expected[] = {15, 0, 0};
		copyRange(buffer, fragments, 14, 3);
		EXPECT_TRUE( 0 == std::memcmp(buffer, expected, sizeof(expected)));
	}

	resetBuffer();

	{
		// Check overlap between null fragment and 4th fragment
		uint8_t expected[] = {0, 1, 2};
		copyRange(buffer, fragments, 19, 3);
		EXPECT_TRUE( 0 == std::memcmp(buffer, expected, sizeof(expected)));
	}

	resetBuffer();

	{
		// Check overlap between last fragment and off-end of buffer (off-buffer should give 0s)
		uint8_t expected[] = {9, 10, 0, 0};
		copyRange(buffer, fragments, 28, 4);
		EXPECT_TRUE( 0 == std::memcmp(buffer, expected, sizeof(expected)));
	}

	resetBuffer();

	{
		// Check way off the end of the buffer
		uint8_t expected[] = {0, 0, 0};
		copyRange(buffer, fragments, 1000, 3);
		EXPECT_TRUE( 0 == std::memcmp(buffer, expected, sizeof(expected)));
	}
}