| // Copyright (c) 2015-2016 The Khronos Group Inc. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a |
| // copy of this software and/or associated documentation files (the |
| // "Materials"), to deal in the Materials without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Materials, and to |
| // permit persons to whom the Materials are furnished to do so, subject to |
| // the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Materials. |
| // |
| // MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS |
| // KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS |
| // SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT |
| // https://www.khronos.org/registry/ |
| // |
| // THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| // MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS. |
| |
| #include "spirv_endian.h" |
| |
| #include <cstring> |
| |
| enum { |
| I32_ENDIAN_LITTLE = 0x03020100ul, |
| I32_ENDIAN_BIG = 0x00010203ul, |
| }; |
| |
| // This constant value allows the detection of the host machine's endianness. |
| // Accessing it through the "value" member is valid due to C++11 section 3.10 |
| // paragraph 10. |
| static const union { |
| unsigned char bytes[4]; |
| uint32_t value; |
| } o32_host_order = {{0, 1, 2, 3}}; |
| |
| #define I32_ENDIAN_HOST (o32_host_order.value) |
| |
| uint32_t spvFixWord(const uint32_t word, const spv_endianness_t endian) { |
| if ((SPV_ENDIANNESS_LITTLE == endian && I32_ENDIAN_HOST == I32_ENDIAN_BIG) || |
| (SPV_ENDIANNESS_BIG == endian && I32_ENDIAN_HOST == I32_ENDIAN_LITTLE)) { |
| return (word & 0x000000ff) << 24 | (word & 0x0000ff00) << 8 | |
| (word & 0x00ff0000) >> 8 | (word & 0xff000000) >> 24; |
| } |
| |
| return word; |
| } |
| |
| uint64_t spvFixDoubleWord(const uint32_t low, const uint32_t high, |
| const spv_endianness_t endian) { |
| return (uint64_t(spvFixWord(high, endian)) << 32) | spvFixWord(low, endian); |
| } |
| |
| spv_result_t spvBinaryEndianness(spv_const_binary binary, |
| spv_endianness_t* pEndian) { |
| if (!binary->code || !binary->wordCount) return SPV_ERROR_INVALID_BINARY; |
| if (!pEndian) return SPV_ERROR_INVALID_POINTER; |
| |
| uint8_t bytes[4]; |
| memcpy(bytes, binary->code, sizeof(uint32_t)); |
| |
| if (0x03 == bytes[0] && 0x02 == bytes[1] && 0x23 == bytes[2] && |
| 0x07 == bytes[3]) { |
| *pEndian = SPV_ENDIANNESS_LITTLE; |
| return SPV_SUCCESS; |
| } |
| |
| if (0x07 == bytes[0] && 0x23 == bytes[1] && 0x02 == bytes[2] && |
| 0x03 == bytes[3]) { |
| *pEndian = SPV_ENDIANNESS_BIG; |
| return SPV_SUCCESS; |
| } |
| |
| return SPV_ERROR_INVALID_BINARY; |
| } |
| |
| bool spvIsHostEndian(spv_endianness_t endian) { |
| return ((SPV_ENDIANNESS_LITTLE == endian) && |
| (I32_ENDIAN_LITTLE == I32_ENDIAN_HOST)) || |
| ((SPV_ENDIANNESS_BIG == endian) && |
| (I32_ENDIAN_BIG == I32_ENDIAN_HOST)); |
| } |