diff options
Diffstat (limited to 'src/import/hwpf/fapi2')
-rw-r--r-- | src/import/hwpf/fapi2/include/utils.H | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/import/hwpf/fapi2/include/utils.H b/src/import/hwpf/fapi2/include/utils.H index fcbde482..c45e410c 100644 --- a/src/import/hwpf/fapi2/include/utils.H +++ b/src/import/hwpf/fapi2/include/utils.H @@ -38,6 +38,33 @@ namespace fapi2 { + +/// +/// @brief Endian swapping +/// @tparam T input type +/// @param[in,out] io_input integral input +/// @note https://stackoverflow.com/questions/105252/how-do-i-convert-between-big-endian-and-little-endian-values-in-c +/// This function does not take into account the system's endianness, but just does the endian swap +/// +template < typename T > +void endian_swap(T& io_input) +{ + constexpr size_t MIN_BYTES = 2; + static_assert(sizeof(T) >= MIN_BYTES, "Byte swapping requires at least 2 bytes of data"); + + uint8_t* l_varArray = reinterpret_cast<uint8_t*>(&io_input); + + for(size_t i = 0; i < sizeof(io_input) / 2; i++) + { + const size_t BYTE_SWAP_INDEX = sizeof(io_input) - 1 - i; + + // Rolling our own swap as certain downstream libraries do not have std::swap enabled + const auto l_temp = l_varArray[BYTE_SWAP_INDEX]; + l_varArray[BYTE_SWAP_INDEX] = l_varArray[i]; + l_varArray[i] = l_temp; + } +} + #ifndef __PPE__ /// /// @brief Enable/Disable special wakeup on processor chip core(s) |