+++ /dev/null
-/** @file\r
- Utility functions to generate checksum based on 2's complement\r
- algorithm.\r
-\r
- Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>\r
- This program and the accompanying materials\r
- are licensed and made available under the terms and conditions of the BSD License\r
- which accompanies this distribution. The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.php.\r
-\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
-\r
-**/\r
-\r
-#include "BaseLibInternals.h"\r
-\r
-/**\r
- Returns the sum of all elements in a buffer in unit of UINT8.\r
- During calculation, the carry bits are dropped.\r
-\r
- This function calculates the sum of all elements in a buffer\r
- in unit of UINT8. The carry bits in result of addition are dropped.\r
- The result is returned as UINT8. If Length is Zero, then Zero is\r
- returned.\r
-\r
- If Buffer is NULL, then ASSERT().\r
- If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
-\r
- @param Buffer The pointer to the buffer to carry out the sum operation.\r
- @param Length The size, in bytes, of Buffer.\r
-\r
- @return Sum The sum of Buffer with carry bits dropped during additions.\r
-\r
-**/\r
-UINT8\r
-EFIAPI\r
-CalculateSum8 (\r
- IN CONST UINT8 *Buffer,\r
- IN UINTN Length\r
- )\r
-{\r
- UINT8 Sum;\r
- UINTN Count;\r
-\r
- ASSERT (Buffer != NULL);\r
- ASSERT (Length <= (MAX_ADDRESS - ((UINTN) Buffer) + 1));\r
-\r
- for (Sum = 0, Count = 0; Count < Length; Count++) {\r
- Sum = (UINT8) (Sum + *(Buffer + Count));\r
- }\r
- \r
- return Sum;\r
-}\r
-\r
-\r
-/**\r
- Returns the two's complement checksum of all elements in a buffer\r
- of 8-bit values.\r
-\r
- This function first calculates the sum of the 8-bit values in the\r
- buffer specified by Buffer and Length. The carry bits in the result\r
- of addition are dropped. Then, the two's complement of the sum is\r
- returned. If Length is 0, then 0 is returned.\r
-\r
- If Buffer is NULL, then ASSERT().\r
- If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
-\r
- @param Buffer The pointer to the buffer to carry out the checksum operation.\r
- @param Length The size, in bytes, of Buffer.\r
-\r
- @return Checksum The 2's complement checksum of Buffer.\r
-\r
-**/\r
-UINT8\r
-EFIAPI\r
-CalculateCheckSum8 (\r
- IN CONST UINT8 *Buffer,\r
- IN UINTN Length\r
- )\r
-{\r
- UINT8 CheckSum;\r
-\r
- CheckSum = CalculateSum8 (Buffer, Length);\r
-\r
- //\r
- // Return the checksum based on 2's complement.\r
- //\r
- return (UINT8) (0x100 - CheckSum);\r
-}\r
-\r
-/**\r
- Returns the sum of all elements in a buffer of 16-bit values. During\r
- calculation, the carry bits are dropped.\r
-\r
- This function calculates the sum of the 16-bit values in the buffer\r
- specified by Buffer and Length. The carry bits in result of addition are dropped.\r
- The 16-bit result is returned. If Length is 0, then 0 is returned.\r
-\r
- If Buffer is NULL, then ASSERT().\r
- If Buffer is not aligned on a 16-bit boundary, then ASSERT().\r
- If Length is not aligned on a 16-bit boundary, then ASSERT().\r
- If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
-\r
- @param Buffer The pointer to the buffer to carry out the sum operation.\r
- @param Length The size, in bytes, of Buffer.\r
-\r
- @return Sum The sum of Buffer with carry bits dropped during additions.\r
-\r
-**/\r
-UINT16\r
-EFIAPI\r
-CalculateSum16 (\r
- IN CONST UINT16 *Buffer,\r
- IN UINTN Length\r
- )\r
-{\r
- UINT16 Sum;\r
- UINTN Count;\r
- UINTN Total;\r
-\r
- ASSERT (Buffer != NULL);\r
- ASSERT (((UINTN) Buffer & 0x1) == 0);\r
- ASSERT ((Length & 0x1) == 0);\r
- ASSERT (Length <= (MAX_ADDRESS - ((UINTN) Buffer) + 1));\r
-\r
- Total = Length / sizeof (*Buffer);\r
- for (Sum = 0, Count = 0; Count < Total; Count++) {\r
- Sum = (UINT16) (Sum + *(Buffer + Count));\r
- }\r
- \r
- return Sum;\r
-}\r
-\r
-\r
-/**\r
- Returns the two's complement checksum of all elements in a buffer of\r
- 16-bit values.\r
-\r
- This function first calculates the sum of the 16-bit values in the buffer\r
- specified by Buffer and Length. The carry bits in the result of addition\r
- are dropped. Then, the two's complement of the sum is returned. If Length\r
- is 0, then 0 is returned.\r
-\r
- If Buffer is NULL, then ASSERT().\r
- If Buffer is not aligned on a 16-bit boundary, then ASSERT().\r
- If Length is not aligned on a 16-bit boundary, then ASSERT().\r
- If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
-\r
- @param Buffer The pointer to the buffer to carry out the checksum operation.\r
- @param Length The size, in bytes, of Buffer.\r
-\r
- @return Checksum The 2's complement checksum of Buffer.\r
-\r
-**/\r
-UINT16\r
-EFIAPI\r
-CalculateCheckSum16 (\r
- IN CONST UINT16 *Buffer,\r
- IN UINTN Length\r
- )\r
-{\r
- UINT16 CheckSum;\r
-\r
- CheckSum = CalculateSum16 (Buffer, Length);\r
-\r
- //\r
- // Return the checksum based on 2's complement.\r
- //\r
- return (UINT16) (0x10000 - CheckSum);\r
-}\r
-\r
-\r
-/**\r
- Returns the sum of all elements in a buffer of 32-bit values. During\r
- calculation, the carry bits are dropped.\r
-\r
- This function calculates the sum of the 32-bit values in the buffer\r
- specified by Buffer and Length. The carry bits in result of addition are dropped.\r
- The 32-bit result is returned. If Length is 0, then 0 is returned.\r
-\r
- If Buffer is NULL, then ASSERT().\r
- If Buffer is not aligned on a 32-bit boundary, then ASSERT().\r
- If Length is not aligned on a 32-bit boundary, then ASSERT().\r
- If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
-\r
- @param Buffer The pointer to the buffer to carry out the sum operation.\r
- @param Length The size, in bytes, of Buffer.\r
-\r
- @return Sum The sum of Buffer with carry bits dropped during additions.\r
-\r
-**/\r
-UINT32\r
-EFIAPI\r
-CalculateSum32 (\r
- IN CONST UINT32 *Buffer,\r
- IN UINTN Length\r
- )\r
-{\r
- UINT32 Sum;\r
- UINTN Count;\r
- UINTN Total;\r
-\r
- ASSERT (Buffer != NULL);\r
- ASSERT (((UINTN) Buffer & 0x3) == 0);\r
- ASSERT ((Length & 0x3) == 0);\r
- ASSERT (Length <= (MAX_ADDRESS - ((UINTN) Buffer) + 1));\r
-\r
- Total = Length / sizeof (*Buffer);\r
- for (Sum = 0, Count = 0; Count < Total; Count++) {\r
- Sum = Sum + *(Buffer + Count);\r
- }\r
- \r
- return Sum;\r
-}\r
-\r
-\r
-/**\r
- Returns the two's complement checksum of all elements in a buffer of\r
- 32-bit values.\r
-\r
- This function first calculates the sum of the 32-bit values in the buffer\r
- specified by Buffer and Length. The carry bits in the result of addition\r
- are dropped. Then, the two's complement of the sum is returned. If Length\r
- is 0, then 0 is returned.\r
-\r
- If Buffer is NULL, then ASSERT().\r
- If Buffer is not aligned on a 32-bit boundary, then ASSERT().\r
- If Length is not aligned on a 32-bit boundary, then ASSERT().\r
- If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
-\r
- @param Buffer The pointer to the buffer to carry out the checksum operation.\r
- @param Length The size, in bytes, of Buffer.\r
-\r
- @return Checksum The 2's complement checksum of Buffer.\r
-\r
-**/\r
-UINT32\r
-EFIAPI\r
-CalculateCheckSum32 (\r
- IN CONST UINT32 *Buffer,\r
- IN UINTN Length\r
- )\r
-{\r
- UINT32 CheckSum;\r
-\r
- CheckSum = CalculateSum32 (Buffer, Length);\r
-\r
- //\r
- // Return the checksum based on 2's complement.\r
- //\r
- return (UINT32) ((UINT32)(-1) - CheckSum + 1);\r
-}\r
-\r
-\r
-/**\r
- Returns the sum of all elements in a buffer of 64-bit values. During\r
- calculation, the carry bits are dropped.\r
-\r
- This function calculates the sum of the 64-bit values in the buffer\r
- specified by Buffer and Length. The carry bits in result of addition are dropped.\r
- The 64-bit result is returned. If Length is 0, then 0 is returned.\r
-\r
- If Buffer is NULL, then ASSERT().\r
- If Buffer is not aligned on a 64-bit boundary, then ASSERT().\r
- If Length is not aligned on a 64-bit boundary, then ASSERT().\r
- If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
-\r
- @param Buffer The pointer to the buffer to carry out the sum operation.\r
- @param Length The size, in bytes, of Buffer.\r
-\r
- @return Sum The sum of Buffer with carry bits dropped during additions.\r
-\r
-**/\r
-UINT64\r
-EFIAPI\r
-CalculateSum64 (\r
- IN CONST UINT64 *Buffer,\r
- IN UINTN Length\r
- )\r
-{\r
- UINT64 Sum;\r
- UINTN Count;\r
- UINTN Total;\r
-\r
- ASSERT (Buffer != NULL);\r
- ASSERT (((UINTN) Buffer & 0x7) == 0);\r
- ASSERT ((Length & 0x7) == 0);\r
- ASSERT (Length <= (MAX_ADDRESS - ((UINTN) Buffer) + 1));\r
-\r
- Total = Length / sizeof (*Buffer);\r
- for (Sum = 0, Count = 0; Count < Total; Count++) {\r
- Sum = Sum + *(Buffer + Count);\r
- }\r
- \r
- return Sum;\r
-}\r
-\r
-\r
-/**\r
- Returns the two's complement checksum of all elements in a buffer of\r
- 64-bit values.\r
-\r
- This function first calculates the sum of the 64-bit values in the buffer\r
- specified by Buffer and Length. The carry bits in the result of addition\r
- are dropped. Then, the two's complement of the sum is returned. If Length\r
- is 0, then 0 is returned.\r
-\r
- If Buffer is NULL, then ASSERT().\r
- If Buffer is not aligned on a 64-bit boundary, then ASSERT().\r
- If Length is not aligned on a 64-bit boundary, then ASSERT().\r
- If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
-\r
- @param Buffer The pointer to the buffer to carry out the checksum operation.\r
- @param Length The size, in bytes, of Buffer.\r
-\r
- @return Checksum The 2's complement checksum of Buffer.\r
-\r
-**/\r
-UINT64\r
-EFIAPI\r
-CalculateCheckSum64 (\r
- IN CONST UINT64 *Buffer,\r
- IN UINTN Length\r
- )\r
-{\r
- UINT64 CheckSum;\r
-\r
- CheckSum = CalculateSum64 (Buffer, Length);\r
-\r
- //\r
- // Return the checksum based on 2's complement.\r
- //\r
- return (UINT64) ((UINT64)(-1) - CheckSum + 1);\r
-}\r
-\r
-\r
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