blob: 20f7a12556fea028b76db89b6f867251bbe3e4af [file] [log] [blame]
// Copyright 2019 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/fxcrt/byteorder.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
// Original code to use as a reference implementation.
#define FXWORD_GET_LSBFIRST(p) \
(static_cast<uint16_t>((static_cast<uint16_t>(p[1]) << 8) | \
(static_cast<uint16_t>(p[0]))))
#define FXWORD_GET_MSBFIRST(p) \
(static_cast<uint16_t>((static_cast<uint16_t>(p[0]) << 8) | \
(static_cast<uint16_t>(p[1]))))
#define FXDWORD_GET_LSBFIRST(p) \
((static_cast<uint32_t>(p[3]) << 24) | (static_cast<uint32_t>(p[2]) << 16) | \
(static_cast<uint32_t>(p[1]) << 8) | (static_cast<uint32_t>(p[0])))
#define FXDWORD_GET_MSBFIRST(p) \
((static_cast<uint32_t>(p[0]) << 24) | (static_cast<uint32_t>(p[1]) << 16) | \
(static_cast<uint32_t>(p[2]) << 8) | (static_cast<uint32_t>(p[3])))
constexpr uint32_t kTestValues32[] = {
0x0, 0x1, 0x2, 0x3, 0x4, 0xfe,
0xff, 0x100, 0x101, 0xffff, 0x10000, 0x123456,
0x345167, 0x2f3e4a5b, 0xff000000, 0xfffffffe, 0xffffffff};
} // namespace
namespace fxcrt {
TEST(ByteOrder, ByteSwapToLE16) {
// Since there are so few values, test them all.
for (uint32_t v = 0; v < 0x10000; ++v) {
const uint16_t v16 = v;
uint16_t expected =
FXWORD_GET_LSBFIRST(reinterpret_cast<const uint8_t*>(&v16));
EXPECT_EQ(expected, ByteSwapToLE16(v16)) << v;
}
}
TEST(ByteOrder, ByteSwapToLE32) {
for (uint32_t v : kTestValues32) {
uint32_t expected =
FXDWORD_GET_LSBFIRST(reinterpret_cast<const uint8_t*>(&v));
EXPECT_EQ(expected, ByteSwapToLE32(v)) << v;
}
}
TEST(ByteOrder, ByteSwapToBE16) {
// Since there are so few values, test them all.
for (uint32_t v = 0; v < 0x10000; ++v) {
const uint16_t v16 = v;
uint16_t expected =
FXWORD_GET_MSBFIRST(reinterpret_cast<const uint8_t*>(&v16));
EXPECT_EQ(expected, ByteSwapToBE16(v16)) << v;
}
}
TEST(ByteOrder, ByteSwapToBE32) {
for (uint32_t v : kTestValues32) {
uint32_t expected =
FXDWORD_GET_MSBFIRST(reinterpret_cast<const uint8_t*>(&v));
EXPECT_EQ(expected, ByteSwapToBE32(v)) << v;
}
}
} // namespace fxcrt