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Diffstat (limited to '')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptPei/CompareMemWrapper.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptPei/CompareMemWrapper.c b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptPei/CompareMemWrapper.c new file mode 100644 index 00000000..c19d2140 --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibOptPei/CompareMemWrapper.c @@ -0,0 +1,60 @@ +/** @file + CompareMem() implementation. + + The following BaseMemoryLib instances contain the same copy of this file: + BaseMemoryLib + BaseMemoryLibMmx + BaseMemoryLibSse2 + BaseMemoryLibRepStr + BaseMemoryLibOptDxe + BaseMemoryLibOptPei + PeiMemoryLib + UefiMemoryLib + +Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR> +SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include "MemLibInternals.h" + +/** + Compares the contents of two buffers. + + This function compares Length bytes of SourceBuffer to Length bytes of DestinationBuffer. + If all Length bytes of the two buffers are identical, then 0 is returned. Otherwise, the + value returned is the first mismatched byte in SourceBuffer subtracted from the first + mismatched byte in DestinationBuffer. + + If Length > 0 and DestinationBuffer is NULL, then ASSERT(). + If Length > 0 and SourceBuffer is NULL, then ASSERT(). + If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT(). + If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT(). + + @param DestinationBuffer The pointer to the destination buffer to compare. + @param SourceBuffer The pointer to the source buffer to compare. + @param Length The number of bytes to compare. + + @return 0 All Length bytes of the two buffers are identical. + @retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first + mismatched byte in DestinationBuffer. + +**/ +INTN +EFIAPI +CompareMem ( + IN CONST VOID *DestinationBuffer, + IN CONST VOID *SourceBuffer, + IN UINTN Length + ) +{ + if (Length == 0 || DestinationBuffer == SourceBuffer) { + return 0; + } + ASSERT (DestinationBuffer != NULL); + ASSERT (SourceBuffer != NULL); + ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer)); + ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer)); + + return InternalMemCompareMem (DestinationBuffer, SourceBuffer, Length); +} |