mirror of
https://github.com/kevinbentley/Descent3.git
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91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
/*
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* Descent 3
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* Copyright (C) 2024 Descent Developers
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <gtest/gtest.h>
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#include "byteswap.h"
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// This code taken from original byteswap.h for testing float conversion
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// It cannot convert negative float numbers in 64-bit systems, so testing only non-negative numbers
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#define SWAPINT(x) (int)(((x) << 24) | (((uint32_t)(x)) >> 24) | (((x) & 0x0000ff00) << 8) | (((x) & 0x00ff0000) >> 8))
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// Stupid function to trick the compiler into letting me byteswap a float
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inline float SWAPFLOAT(float x) {
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int i = SWAPINT(*((int *)&(x)));
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return *((float *)&(i));
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}
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// Taken from CFILE.cpp
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inline double SWAPDOUBLE(double x) {
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double t;
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int *sp = (int *)&x;
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int *dp = (int *)&t;
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dp[0] = SWAPINT(sp[1]);
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dp[1] = SWAPINT(sp[0]);
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x = t;
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return x;
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}
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TEST(D3, ByteSwap) {
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EXPECT_EQ(D3::byteswap((uint8_t)0x01), (uint8_t)0x01);
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EXPECT_EQ(D3::byteswap((int8_t)0x01), (int16_t)0x01);
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EXPECT_EQ(D3::byteswap((uint16_t)0x0123), (uint16_t)0x2301);
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EXPECT_EQ(D3::byteswap((int16_t)0x0123), (int16_t)0x2301);
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EXPECT_EQ(D3::byteswap((int32_t)0x01234567), (int32_t)0x67452301);
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EXPECT_EQ(D3::byteswap((int64_t)0x0123456789ABCDEF), (int64_t)0xEFCDAB8967452301);
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EXPECT_EQ(D3::byteswap((int32_t)(0xFF000000)), (int32_t)0xFF);
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}
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TEST(D3, Converting) {
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#ifndef OUTRAGE_BIG_ENDIAN
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EXPECT_EQ(D3::convert_le((int16_t)0x10), 0x10);
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EXPECT_EQ(D3::convert_le((int32_t)0x10), 0x10);
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EXPECT_EQ(D3::convert_le((int64_t)0x10), 0x10);
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EXPECT_EQ(D3::convert_be((int16_t)0x10), 0x1000);
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EXPECT_EQ(D3::convert_be((int32_t)0x10), 0x10000000);
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EXPECT_EQ(D3::convert_be((int64_t)0x10), 0x1000000000000000);
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#else
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EXPECT_EQ(D3::convert_be((int16_t)0x10), 0x10);
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EXPECT_EQ(D3::convert_be((int32_t)0x10), 0x10);
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EXPECT_EQ(D3::convert_be((int64_t)0x10), 0x10);
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EXPECT_EQ(D3::convert_le((int16_t)0x10), 0x1000);
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EXPECT_EQ(D3::convert_le((int16_t)0x10), 0x10000000);
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EXPECT_EQ(D3::convert_le((int16_t)0x10), 0x1000000000000000);
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#endif
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}
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TEST(D3, FloatDoubleOperations) {
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// float/double sanity checks
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EXPECT_EQ(sizeof(float), 4);
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EXPECT_EQ(sizeof(double), 8);
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EXPECT_EQ(D3::byteswap(0.0f), SWAPFLOAT(0.0f));
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EXPECT_EQ(D3::byteswap(10.0f), SWAPFLOAT(10.0f));
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EXPECT_EQ(D3::byteswap(10000.0f), SWAPFLOAT(10000.0f));
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EXPECT_EQ(D3::byteswap(0.0), SWAPDOUBLE(0.0));
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EXPECT_EQ(D3::byteswap(10.0), SWAPDOUBLE(10.0));
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EXPECT_EQ(D3::byteswap(10000.0), SWAPDOUBLE(10000.0));
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}
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