| Message ID | 20190201060152.55724-2-ming.huang@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [Linaro-uefi,MdePkg/BaseLib,v1,1/1] MdePkg BaseLib: Add new API CalculateCrc16() | expand |
On 2/1/2019 5:56 PM, Ard Biesheuvel wrote: > On Fri, 1 Feb 2019 at 08:11, Ming Huang <ming.huang@linaro.org> wrote: >> >> >> >> On 2/1/2019 2:37 PM, Ni, Ray wrote: >>> There is an CRC16 calculation implementation in >>> SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/DebugAgent.c >>> >>> Does your implementation generate the same CRC16 as above one? >> >> It is not the same with above one. >> > > So which polynomial is your CRC-16 implementation based on, and why > does it belong in BaseLib, i.e., what is the relevance for other > BaseLib users for this particular flavour of CRC I don't know which polynomial is base on, this CRC16 value bases on CCITT, I don't familiar with CRC algorithm. This move CRC16 to core patch is suggested by Leif. Thanks. > > Thanks, > Ard. > > >>> >>>> -----Original Message----- >>>> From: edk2-devel <edk2-devel-bounces@lists.01.org> On Behalf Of Ming >>>> Huang >>>> Sent: Friday, February 1, 2019 2:02 PM >>>> To: linaro-uefi@lists.linaro.org; edk2-devel@lists.01.org; Kinney, Michael D >>>> <michael.d.kinney@intel.com>; Gao, Liming <liming.gao@intel.com> >>>> Cc: huangming23@huawei.com; Dong, Eric <eric.dong@intel.com>; >>>> zhangjinsong2@huawei.com; Zeng, Star <star.zeng@intel.com>; >>>> waip23@126.com; wanghuiqiang@huawei.com; huangdaode@hisilicon.com >>>> Subject: [edk2] [MdePkg/BaseLib v1 1/1] MdePkg BaseLib: Add new API >>>> CalculateCrc16() >>>> >>>> CalculateCrc16() bases on the initialized mCrcTable. When CalculateCrc16() is >>>> used, mCrcTable16 will take 512Bytes size in the image. When >>>> CalculateCrc16() is not used, mCrcTable16 will not be built in the image, and >>>> no size impact. >>>> >>>> Contributed-under: TianoCore Contribution Agreement 1.1 >>>> Signed-off-by: Ming Huang <ming.huang@linaro.org> >>>> --- >>>> MdePkg/Include/Library/BaseLib.h | 20 ++++++ >>>> MdePkg/Library/BaseLib/CheckSum.c | 73 ++++++++++++++++++++ >>>> 2 files changed, 93 insertions(+) >>>> >>>> diff --git a/MdePkg/Include/Library/BaseLib.h >>>> b/MdePkg/Include/Library/BaseLib.h >>>> index 1eb842384ee2..956b971e5c69 100644 >>>> --- a/MdePkg/Include/Library/BaseLib.h >>>> +++ b/MdePkg/Include/Library/BaseLib.h >>>> @@ -4855,6 +4855,26 @@ CalculateCrc32( >>>> IN UINTN Length >>>> ); >>>> >>>> +/** >>>> + Computes and returns a 16-bit CRC for a data buffer. >>>> + CRC16 value bases on CCITT. >>>> + >>>> + If Buffer is NULL, then ASSERT(). >>>> + If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). >>>> + >>>> + @param[in] Buffer A pointer to the buffer on which the 16-bit CRC is to >>>> be computed. >>>> + @param[in] Length The number of bytes in the buffer Data. >>>> + >>>> + @retval Crc16 The 16-bit CRC was computed for the data buffer. >>>> + >>>> +**/ >>>> +UINT16 >>>> +EFIAPI >>>> +CalculateCrc16( >>>> + IN VOID *Buffer, >>>> + IN UINTN Length >>>> + ); >>>> + >>>> // >>>> // Base Library CPU Functions >>>> // >>>> diff --git a/MdePkg/Library/BaseLib/CheckSum.c >>>> b/MdePkg/Library/BaseLib/CheckSum.c >>>> index 03d49afc5e6c..4e27aebe44bc 100644 >>>> --- a/MdePkg/Library/BaseLib/CheckSum.c >>>> +++ b/MdePkg/Library/BaseLib/CheckSum.c >>>> @@ -630,3 +630,76 @@ CalculateCrc32( >>>> >>>> return Crc ^ 0xffffffff; >>>> } >>>> + >>>> +GLOBAL_REMOVE_IF_UNREFERENCED CONST UINT16 mCrcTable16[256] = >>>> { >>>> + 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, >>>> + 0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, >>>> + 0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, >>>> + 0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, >>>> + 0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485, >>>> + 0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D, >>>> + 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4, >>>> + 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC, >>>> + 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823, >>>> + 0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, >>>> + 0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12, >>>> + 0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, >>>> + 0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41, >>>> + 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49, >>>> + 0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70, >>>> + 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78, >>>> + 0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F, >>>> + 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067, >>>> + 0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, >>>> + 0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256, >>>> + 0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, >>>> + 0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, >>>> + 0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C, >>>> + 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634, >>>> + 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB, >>>> + 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3, >>>> + 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A, >>>> + 0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, >>>> + 0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, >>>> + 0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, >>>> + 0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, >>>> + 0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0 }; >>>> + >>>> +/** >>>> + Computes and returns a 16-bit CRC for a data buffer. >>>> + CRC16 value bases on CCITT. >>>> + >>>> + If Buffer is NULL, then ASSERT(). >>>> + If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). >>>> + >>>> + @param[in] Buffer A pointer to the buffer on which the 16-bit CRC is to >>>> be computed. >>>> + @param[in] Length The number of bytes in the buffer Data. >>>> + >>>> + @retval Crc16 The 16-bit CRC was computed for the data buffer. >>>> + >>>> +**/ >>>> +UINT16 >>>> +EFIAPI >>>> +CalculateCrc16( >>>> + IN VOID *Buffer, >>>> + IN UINTN Length >>>> + ) >>>> +{ >>>> + UINT16 Crc; >>>> + UINT8 *Ptr; >>>> + >>>> + ASSERT (Buffer != NULL); >>>> + ASSERT (Length <= (MAX_ADDRESS - ((UINTN) Buffer) + 1)); >>>> + >>>> + Crc = 0; >>>> + Ptr = (UINT8 *)Buffer; >>>> + while (Length) { >>>> + Crc = mCrcTable16[((UINT8)((Crc >> 8) & 0xff)) ^ *(Ptr++)] ^ >>>> + ((UINT16)(Crc << 8)); >>>> + Length--; >>>> + } >>>> + >>>> + return Crc; >>>> +} >>>> + >>>> -- >>>> 2.9.5 >>>> >>>> _______________________________________________ >>>> edk2-devel mailing list >>>> edk2-devel@lists.01.org >>>> https://lists.01.org/mailman/listinfo/edk2-devel >> _______________________________________________ >> edk2-devel mailing list >> edk2-devel@lists.01.org >> https://lists.01.org/mailman/listinfo/edk2-devel
On 2/1/2019 8:25 PM, Gao, Liming wrote: > Ming: > What's usage model of new Crc16()? Can they use the same algorithm in DebugAgent? It is used in check MAC read from eeprom. I think they cann't use the algorithm in DebugAgent. Thanks. > > Thanks > Liming >> -----Original Message----- >> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ming Huang >> Sent: Friday, February 1, 2019 3:12 PM >> To: Ni, Ray <ray.ni@intel.com>; linaro-uefi@lists.linaro.org; edk2-devel@lists.01.org; Kinney, Michael D <michael.d.kinney@intel.com>; >> Gao, Liming <liming.gao@intel.com> >> Cc: huangming23@huawei.com; Dong, Eric <eric.dong@intel.com>; zhangjinsong2@huawei.com; wanghuiqiang@huawei.com; >> waip23@126.com; Zeng, Star <star.zeng@intel.com>; huangdaode@hisilicon.com >> Subject: Re: [edk2] [MdePkg/BaseLib v1 1/1] MdePkg BaseLib: Add new API CalculateCrc16() >> >> >> >> On 2/1/2019 2:37 PM, Ni, Ray wrote: >>> There is an CRC16 calculation implementation in >>> SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/DebugAgent.c >>> >>> Does your implementation generate the same CRC16 as above one? >> >> It is not the same with above one. >> >>> >>>> -----Original Message----- >>>> From: edk2-devel <edk2-devel-bounces@lists.01.org> On Behalf Of Ming >>>> Huang >>>> Sent: Friday, February 1, 2019 2:02 PM >>>> To: linaro-uefi@lists.linaro.org; edk2-devel@lists.01.org; Kinney, Michael D >>>> <michael.d.kinney@intel.com>; Gao, Liming <liming.gao@intel.com> >>>> Cc: huangming23@huawei.com; Dong, Eric <eric.dong@intel.com>; >>>> zhangjinsong2@huawei.com; Zeng, Star <star.zeng@intel.com>; >>>> waip23@126.com; wanghuiqiang@huawei.com; huangdaode@hisilicon.com >>>> Subject: [edk2] [MdePkg/BaseLib v1 1/1] MdePkg BaseLib: Add new API >>>> CalculateCrc16() >>>> >>>> CalculateCrc16() bases on the initialized mCrcTable. When CalculateCrc16() is >>>> used, mCrcTable16 will take 512Bytes size in the image. When >>>> CalculateCrc16() is not used, mCrcTable16 will not be built in the image, and >>>> no size impact. >>>> >>>> Contributed-under: TianoCore Contribution Agreement 1.1 >>>> Signed-off-by: Ming Huang <ming.huang@linaro.org> >>>> --- >>>> MdePkg/Include/Library/BaseLib.h | 20 ++++++ >>>> MdePkg/Library/BaseLib/CheckSum.c | 73 ++++++++++++++++++++ >>>> 2 files changed, 93 insertions(+) >>>> >>>> diff --git a/MdePkg/Include/Library/BaseLib.h >>>> b/MdePkg/Include/Library/BaseLib.h >>>> index 1eb842384ee2..956b971e5c69 100644 >>>> --- a/MdePkg/Include/Library/BaseLib.h >>>> +++ b/MdePkg/Include/Library/BaseLib.h >>>> @@ -4855,6 +4855,26 @@ CalculateCrc32( >>>> IN UINTN Length >>>> ); >>>> >>>> +/** >>>> + Computes and returns a 16-bit CRC for a data buffer. >>>> + CRC16 value bases on CCITT. >>>> + >>>> + If Buffer is NULL, then ASSERT(). >>>> + If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). >>>> + >>>> + @param[in] Buffer A pointer to the buffer on which the 16-bit CRC is to >>>> be computed. >>>> + @param[in] Length The number of bytes in the buffer Data. >>>> + >>>> + @retval Crc16 The 16-bit CRC was computed for the data buffer. >>>> + >>>> +**/ >>>> +UINT16 >>>> +EFIAPI >>>> +CalculateCrc16( >>>> + IN VOID *Buffer, >>>> + IN UINTN Length >>>> + ); >>>> + >>>> // >>>> // Base Library CPU Functions >>>> // >>>> diff --git a/MdePkg/Library/BaseLib/CheckSum.c >>>> b/MdePkg/Library/BaseLib/CheckSum.c >>>> index 03d49afc5e6c..4e27aebe44bc 100644 >>>> --- a/MdePkg/Library/BaseLib/CheckSum.c >>>> +++ b/MdePkg/Library/BaseLib/CheckSum.c >>>> @@ -630,3 +630,76 @@ CalculateCrc32( >>>> >>>> return Crc ^ 0xffffffff; >>>> } >>>> + >>>> +GLOBAL_REMOVE_IF_UNREFERENCED CONST UINT16 mCrcTable16[256] = >>>> { >>>> + 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, >>>> + 0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, >>>> + 0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, >>>> + 0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, >>>> + 0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485, >>>> + 0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D, >>>> + 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4, >>>> + 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC, >>>> + 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823, >>>> + 0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, >>>> + 0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12, >>>> + 0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, >>>> + 0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41, >>>> + 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49, >>>> + 0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70, >>>> + 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78, >>>> + 0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F, >>>> + 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067, >>>> + 0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, >>>> + 0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256, >>>> + 0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, >>>> + 0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, >>>> + 0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C, >>>> + 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634, >>>> + 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB, >>>> + 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3, >>>> + 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A, >>>> + 0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, >>>> + 0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, >>>> + 0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, >>>> + 0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, >>>> + 0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0 }; >>>> + >>>> +/** >>>> + Computes and returns a 16-bit CRC for a data buffer. >>>> + CRC16 value bases on CCITT. >>>> + >>>> + If Buffer is NULL, then ASSERT(). >>>> + If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). >>>> + >>>> + @param[in] Buffer A pointer to the buffer on which the 16-bit CRC is to >>>> be computed. >>>> + @param[in] Length The number of bytes in the buffer Data. >>>> + >>>> + @retval Crc16 The 16-bit CRC was computed for the data buffer. >>>> + >>>> +**/ >>>> +UINT16 >>>> +EFIAPI >>>> +CalculateCrc16( >>>> + IN VOID *Buffer, >>>> + IN UINTN Length >>>> + ) >>>> +{ >>>> + UINT16 Crc; >>>> + UINT8 *Ptr; >>>> + >>>> + ASSERT (Buffer != NULL); >>>> + ASSERT (Length <= (MAX_ADDRESS - ((UINTN) Buffer) + 1)); >>>> + >>>> + Crc = 0; >>>> + Ptr = (UINT8 *)Buffer; >>>> + while (Length) { >>>> + Crc = mCrcTable16[((UINT8)((Crc >> 8) & 0xff)) ^ *(Ptr++)] ^ >>>> + ((UINT16)(Crc << 8)); >>>> + Length--; >>>> + } >>>> + >>>> + return Crc; >>>> +} >>>> + >>>> -- >>>> 2.9.5 >>>> >>>> _______________________________________________ >>>> edk2-devel mailing list >>>> edk2-devel@lists.01.org >>>> https://lists.01.org/mailman/listinfo/edk2-devel >> _______________________________________________ >> edk2-devel mailing list >> edk2-devel@lists.01.org >> https://lists.01.org/mailman/listinfo/edk2-devel
diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h index 1eb842384ee2..956b971e5c69 100644 --- a/MdePkg/Include/Library/BaseLib.h +++ b/MdePkg/Include/Library/BaseLib.h @@ -4855,6 +4855,26 @@ CalculateCrc32( IN UINTN Length ); +/** + Computes and returns a 16-bit CRC for a data buffer. + CRC16 value bases on CCITT. + + If Buffer is NULL, then ASSERT(). + If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). + + @param[in] Buffer A pointer to the buffer on which the 16-bit CRC is to be computed. + @param[in] Length The number of bytes in the buffer Data. + + @retval Crc16 The 16-bit CRC was computed for the data buffer. + +**/ +UINT16 +EFIAPI +CalculateCrc16( + IN VOID *Buffer, + IN UINTN Length + ); + // // Base Library CPU Functions // diff --git a/MdePkg/Library/BaseLib/CheckSum.c b/MdePkg/Library/BaseLib/CheckSum.c index 03d49afc5e6c..4e27aebe44bc 100644 --- a/MdePkg/Library/BaseLib/CheckSum.c +++ b/MdePkg/Library/BaseLib/CheckSum.c @@ -630,3 +630,76 @@ CalculateCrc32( return Crc ^ 0xffffffff; } + +GLOBAL_REMOVE_IF_UNREFERENCED CONST UINT16 mCrcTable16[256] = { + 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, + 0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, + 0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, + 0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, + 0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485, + 0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D, + 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4, + 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC, + 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823, + 0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, + 0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12, + 0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, + 0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41, + 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49, + 0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70, + 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78, + 0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F, + 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067, + 0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, + 0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256, + 0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, + 0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, + 0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C, + 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634, + 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB, + 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3, + 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A, + 0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, + 0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, + 0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, + 0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, + 0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0 +}; + +/** + Computes and returns a 16-bit CRC for a data buffer. + CRC16 value bases on CCITT. + + If Buffer is NULL, then ASSERT(). + If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). + + @param[in] Buffer A pointer to the buffer on which the 16-bit CRC is to be computed. + @param[in] Length The number of bytes in the buffer Data. + + @retval Crc16 The 16-bit CRC was computed for the data buffer. + +**/ +UINT16 +EFIAPI +CalculateCrc16( + IN VOID *Buffer, + IN UINTN Length + ) +{ + UINT16 Crc; + UINT8 *Ptr; + + ASSERT (Buffer != NULL); + ASSERT (Length <= (MAX_ADDRESS - ((UINTN) Buffer) + 1)); + + Crc = 0; + Ptr = (UINT8 *)Buffer; + while (Length) { + Crc = mCrcTable16[((UINT8)((Crc >> 8) & 0xff)) ^ *(Ptr++)] ^ + ((UINT16)(Crc << 8)); + Length--; + } + + return Crc; +} +
CalculateCrc16() bases on the initialized mCrcTable. When CalculateCrc16() is used, mCrcTable16 will take 512Bytes size in the image. When CalculateCrc16() is not used, mCrcTable16 will not be built in the image, and no size impact. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ming Huang <ming.huang@linaro.org> --- MdePkg/Include/Library/BaseLib.h | 20 ++++++ MdePkg/Library/BaseLib/CheckSum.c | 73 ++++++++++++++++++++ 2 files changed, 93 insertions(+)