69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
// Copyright 2022, FOSS-VG Developers and Contributers
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU Affero General Public License as published
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// by the Free Software Foundation, version 3.
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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
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// version 3 along with this program.
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// If not, see https://www.gnu.org/licenses/agpl-3.0.en.html
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#include <iostream>
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#include <cstdint>
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int main() {
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uint32_t* testInteger = new uint32_t;
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*testInteger = 0x04030201;
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auto data = reinterpret_cast<std::uint8_t*>(testInteger);
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std::cout << "#pragma once" << std::endl;
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if (
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*data == 0x01 &&
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*(data+1)==0x02 &&
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*(data+2)==0x03 &&
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*(data+3)==0x04
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) {
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std::cerr << "Little Endian" << std::endl;
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std::cout << "#define FOSSVG_LITTLE_ENDIAN" << std::endl;
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} else if (
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*data == 0x04 &&
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*(data+1)==0x03 &&
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*(data+2)==0x02 &&
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*(data+3)==0x01
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) {
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std::cerr << "Big Endian" << std::endl;
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std::cout << "#define FOSSVG_BIG_ENDIAN" << std::endl;
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} else if (
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*data == 0x03 &&
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*(data+1)==0x04 &&
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*(data+2)==0x01 &&
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*(data+3)==0x02
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) {
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std::cerr << "PDP Endian (Little Word)" << std::endl;
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std::cout << "#define FOSSVG_ENDIAN_LITTLE_WORD /* PDP-11-style byte-swapped words */" << std::endl;
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} else if (
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*data == 0x02 &&
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*(data+1)==0x01 &&
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*(data+2)==0x04 &&
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*(data+3)==0x03
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) {
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std::cerr << "Honeywell Endian (Big Word)" << std::endl;
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std::cout << "#define FOSSVG_ENDIAN_BIG_WORD /* Honeywell-316-style byte-swapped words */" << std::endl;
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} else {
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std::cerr << "Unknown Endianness" << std::endl;
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std::cout << "#define FOSSVG_ENDIAN_UNKNOWN" << std::endl;
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}
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delete data;
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std::cerr << "WARNING: This test may be unreliable. If you encounter issues, check the endianness of your machine and set it manually. Bi-endianness is not supported." << std::endl;
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return 0;
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}
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