CalculateCrc32() bases on the initialized mCrcTable. When CalculateCrc32()
is used, mCrcTable will take 1KB size in the image. When CalculateCrc32() 
is not used, mCrcTable will not be built in the image, and no size impact.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
---
 MdePkg/Include/Library/BaseLib.h  |  18 +++
 MdePkg/Library/BaseLib/CheckSum.c | 294 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 312 insertions(+)

diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h
index 40b96b7..de287a7 100644
--- a/MdePkg/Include/Library/BaseLib.h
+++ b/MdePkg/Include/Library/BaseLib.h
@@ -4829,6 +4829,24 @@ CalculateCheckSum64 (
   IN      UINTN                     Length
   );
 
+/**
+  Computes and returns a 32-bit CRC for a data buffer.
+
+  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 32-bit CRC is to be computed.
+  @param[in]  Length       The number of bytes in the buffer Data.
+
+  @retval Crc32             The 32-bit CRC was computed for the data buffer.
+
+**/
+UINT32
+EFIAPI
+CalculateCrc32(
+  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 2968829..788af19 100644
--- a/MdePkg/Library/BaseLib/CheckSum.c
+++ b/MdePkg/Library/BaseLib/CheckSum.c
@@ -334,4 +334,298 @@ CalculateCheckSum64 (
   return (UINT64) ((UINT64)(-1) - CheckSum + 1);
 }
 
+GLOBAL_REMOVE_IF_UNREFERENCED CONST UINT32  mCrcTable[256] = {
+  0x00000000,
+  0x77073096,
+  0xEE0E612C,
+  0x990951BA,
+  0x076DC419,
+  0x706AF48F,
+  0xE963A535,
+  0x9E6495A3,
+  0x0EDB8832,
+  0x79DCB8A4,
+  0xE0D5E91E,
+  0x97D2D988,
+  0x09B64C2B,
+  0x7EB17CBD,
+  0xE7B82D07,
+  0x90BF1D91,
+  0x1DB71064,
+  0x6AB020F2,
+  0xF3B97148,
+  0x84BE41DE,
+  0x1ADAD47D,
+  0x6DDDE4EB,
+  0xF4D4B551,
+  0x83D385C7,
+  0x136C9856,
+  0x646BA8C0,
+  0xFD62F97A,
+  0x8A65C9EC,
+  0x14015C4F,
+  0x63066CD9,
+  0xFA0F3D63,
+  0x8D080DF5,
+  0x3B6E20C8,
+  0x4C69105E,
+  0xD56041E4,
+  0xA2677172,
+  0x3C03E4D1,
+  0x4B04D447,
+  0xD20D85FD,
+  0xA50AB56B,
+  0x35B5A8FA,
+  0x42B2986C,
+  0xDBBBC9D6,
+  0xACBCF940,
+  0x32D86CE3,
+  0x45DF5C75,
+  0xDCD60DCF,
+  0xABD13D59,
+  0x26D930AC,
+  0x51DE003A,
+  0xC8D75180,
+  0xBFD06116,
+  0x21B4F4B5,
+  0x56B3C423,
+  0xCFBA9599,
+  0xB8BDA50F,
+  0x2802B89E,
+  0x5F058808,
+  0xC60CD9B2,
+  0xB10BE924,
+  0x2F6F7C87,
+  0x58684C11,
+  0xC1611DAB,
+  0xB6662D3D,
+  0x76DC4190,
+  0x01DB7106,
+  0x98D220BC,
+  0xEFD5102A,
+  0x71B18589,
+  0x06B6B51F,
+  0x9FBFE4A5,
+  0xE8B8D433,
+  0x7807C9A2,
+  0x0F00F934,
+  0x9609A88E,
+  0xE10E9818,
+  0x7F6A0DBB,
+  0x086D3D2D,
+  0x91646C97,
+  0xE6635C01,
+  0x6B6B51F4,
+  0x1C6C6162,
+  0x856530D8,
+  0xF262004E,
+  0x6C0695ED,
+  0x1B01A57B,
+  0x8208F4C1,
+  0xF50FC457,
+  0x65B0D9C6,
+  0x12B7E950,
+  0x8BBEB8EA,
+  0xFCB9887C,
+  0x62DD1DDF,
+  0x15DA2D49,
+  0x8CD37CF3,
+  0xFBD44C65,
+  0x4DB26158,
+  0x3AB551CE,
+  0xA3BC0074,
+  0xD4BB30E2,
+  0x4ADFA541,
+  0x3DD895D7,
+  0xA4D1C46D,
+  0xD3D6F4FB,
+  0x4369E96A,
+  0x346ED9FC,
+  0xAD678846,
+  0xDA60B8D0,
+  0x44042D73,
+  0x33031DE5,
+  0xAA0A4C5F,
+  0xDD0D7CC9,
+  0x5005713C,
+  0x270241AA,
+  0xBE0B1010,
+  0xC90C2086,
+  0x5768B525,
+  0x206F85B3,
+  0xB966D409,
+  0xCE61E49F,
+  0x5EDEF90E,
+  0x29D9C998,
+  0xB0D09822,
+  0xC7D7A8B4,
+  0x59B33D17,
+  0x2EB40D81,
+  0xB7BD5C3B,
+  0xC0BA6CAD,
+  0xEDB88320,
+  0x9ABFB3B6,
+  0x03B6E20C,
+  0x74B1D29A,
+  0xEAD54739,
+  0x9DD277AF,
+  0x04DB2615,
+  0x73DC1683,
+  0xE3630B12,
+  0x94643B84,
+  0x0D6D6A3E,
+  0x7A6A5AA8,
+  0xE40ECF0B,
+  0x9309FF9D,
+  0x0A00AE27,
+  0x7D079EB1,
+  0xF00F9344,
+  0x8708A3D2,
+  0x1E01F268,
+  0x6906C2FE,
+  0xF762575D,
+  0x806567CB,
+  0x196C3671,
+  0x6E6B06E7,
+  0xFED41B76,
+  0x89D32BE0,
+  0x10DA7A5A,
+  0x67DD4ACC,
+  0xF9B9DF6F,
+  0x8EBEEFF9,
+  0x17B7BE43,
+  0x60B08ED5,
+  0xD6D6A3E8,
+  0xA1D1937E,
+  0x38D8C2C4,
+  0x4FDFF252,
+  0xD1BB67F1,
+  0xA6BC5767,
+  0x3FB506DD,
+  0x48B2364B,
+  0xD80D2BDA,
+  0xAF0A1B4C,
+  0x36034AF6,
+  0x41047A60,
+  0xDF60EFC3,
+  0xA867DF55,
+  0x316E8EEF,
+  0x4669BE79,
+  0xCB61B38C,
+  0xBC66831A,
+  0x256FD2A0,
+  0x5268E236,
+  0xCC0C7795,
+  0xBB0B4703,
+  0x220216B9,
+  0x5505262F,
+  0xC5BA3BBE,
+  0xB2BD0B28,
+  0x2BB45A92,
+  0x5CB36A04,
+  0xC2D7FFA7,
+  0xB5D0CF31,
+  0x2CD99E8B,
+  0x5BDEAE1D,
+  0x9B64C2B0,
+  0xEC63F226,
+  0x756AA39C,
+  0x026D930A,
+  0x9C0906A9,
+  0xEB0E363F,
+  0x72076785,
+  0x05005713,
+  0x95BF4A82,
+  0xE2B87A14,
+  0x7BB12BAE,
+  0x0CB61B38,
+  0x92D28E9B,
+  0xE5D5BE0D,
+  0x7CDCEFB7,
+  0x0BDBDF21,
+  0x86D3D2D4,
+  0xF1D4E242,
+  0x68DDB3F8,
+  0x1FDA836E,
+  0x81BE16CD,
+  0xF6B9265B,
+  0x6FB077E1,
+  0x18B74777,
+  0x88085AE6,
+  0xFF0F6A70,
+  0x66063BCA,
+  0x11010B5C,
+  0x8F659EFF,
+  0xF862AE69,
+  0x616BFFD3,
+  0x166CCF45,
+  0xA00AE278,
+  0xD70DD2EE,
+  0x4E048354,
+  0x3903B3C2,
+  0xA7672661,
+  0xD06016F7,
+  0x4969474D,
+  0x3E6E77DB,
+  0xAED16A4A,
+  0xD9D65ADC,
+  0x40DF0B66,
+  0x37D83BF0,
+  0xA9BCAE53,
+  0xDEBB9EC5,
+  0x47B2CF7F,
+  0x30B5FFE9,
+  0xBDBDF21C,
+  0xCABAC28A,
+  0x53B39330,
+  0x24B4A3A6,
+  0xBAD03605,
+  0xCDD70693,
+  0x54DE5729,
+  0x23D967BF,
+  0xB3667A2E,
+  0xC4614AB8,
+  0x5D681B02,
+  0x2A6F2B94,
+  0xB40BBE37,
+  0xC30C8EA1,
+  0x5A05DF1B,
+  0x2D02EF8D
+};
 
+/**
+  Computes and returns a 32-bit CRC for a data buffer.
+
+  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 32-bit CRC is to be computed.
+  @param[in]  Length       The number of bytes in the buffer Data.
+
+  @retval Crc32             The 32-bit CRC was computed for the data buffer.
+
+**/
+UINT32
+EFIAPI
+CalculateCrc32(
+  IN  VOID                         *Buffer,
+  IN  UINTN                        Length
+  )
+{
+  UINTN   Index;
+  UINT32  Crc;
+  UINT8   *Ptr;
+
+  ASSERT (Buffer != NULL);
+  ASSERT (Length <= (MAX_ADDRESS - ((UINTN) Buffer) + 1));
+
+  //
+  // Compute CRC
+  //
+  Crc = 0xffffffff;
+  for (Index = 0, Ptr = Buffer; Index < Length; Index++, Ptr++) {
+    Crc = (Crc >> 8) ^ mCrcTable[(UINT8) Crc ^ *Ptr];
+  }
+
+  return Crc ^ 0xffffffff;
+}
-- 
2.8.0.windows.1

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