[mirror_edk2.git] / FatPkg / FatPei / FatLiteLib.c

/** @file\r
  General purpose supporting routines for FAT recovery PEIM\r
\r
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
\r
This program and the accompanying materials are licensed and made available\r
under the terms and conditions of the BSD License which accompanies this\r
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 "FatLitePeim.h"\r
\r
\r
#define CHAR_FAT_VALID  0x01\r
\r
\r
/**\r
  Converts a union code character to upper case.\r
  This functions converts a unicode character to upper case.\r
  If the input Letter is not a lower-cased letter,\r
  the original value is returned.\r
\r
  @param  Letter            The input unicode character.\r
\r
  @return The upper cased letter.\r
\r
**/\r
CHAR16\r
ToUpper (\r
  IN CHAR16                    Letter\r
  )\r
{\r
  if ('a' <= Letter && Letter <= 'z') {\r
    Letter = (CHAR16) (Letter - 0x20);\r
  }\r
\r
  return Letter;\r
}\r
\r
\r
/**\r
  Reads a block of data from the block device by calling\r
  underlying Block I/O service.\r
\r
  @param  PrivateData       Global memory map for accessing global variables\r
  @param  BlockDeviceNo     The index for the block device number.\r
  @param  Lba               The logic block address to read data from.\r
  @param  BufferSize        The size of data in byte to read.\r
  @param  Buffer            The buffer of the\r
\r
  @retval EFI_DEVICE_ERROR  The specified block device number exceeds the maximum\r
                            device number.\r
  @retval EFI_DEVICE_ERROR  The maximum address has exceeded the maximum address\r
                            of the block device.\r
\r
**/\r
EFI_STATUS\r
FatReadBlock (\r
  IN  PEI_FAT_PRIVATE_DATA   *PrivateData,\r
  IN  UINTN                  BlockDeviceNo,\r
  IN  EFI_PEI_LBA            Lba,\r
  IN  UINTN                  BufferSize,\r
  OUT VOID                   *Buffer\r
  )\r
{\r
  EFI_STATUS            Status;\r
  PEI_FAT_BLOCK_DEVICE  *BlockDev;\r
\r
  if (BlockDeviceNo > PEI_FAT_MAX_BLOCK_DEVICE - 1) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  Status    = EFI_SUCCESS;\r
  BlockDev  = &(PrivateData->BlockDevice[BlockDeviceNo]);\r
\r
  if (BufferSize > MultU64x32 (BlockDev->LastBlock - Lba + 1, BlockDev->BlockSize)) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  if (!BlockDev->Logical) {\r
    //\r
    // Status = BlockDev->ReadFunc\r
    //  (PrivateData->PeiServices, BlockDev->PhysicalDevNo, Lba, BufferSize, Buffer);\r
    //\r
    if (BlockDev->BlockIo2 != NULL) {\r
      Status = BlockDev->BlockIo2->ReadBlocks (\r
                                    (EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),\r
                                    BlockDev->BlockIo2,\r
                                    BlockDev->PhysicalDevNo,\r
                                    Lba,\r
                                    BufferSize,\r
                                    Buffer\r
                                    );\r
    } else {\r
      Status = BlockDev->BlockIo->ReadBlocks (\r
                                  (EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),\r
                                  BlockDev->BlockIo,\r
                                  BlockDev->PhysicalDevNo,\r
                                  Lba,\r
                                  BufferSize,\r
                                  Buffer\r
                                  );\r
    }\r
\r
  } else {\r
    Status = FatReadDisk (\r
              PrivateData,\r
              BlockDev->ParentDevNo,\r
              BlockDev->StartingPos + MultU64x32 (Lba, BlockDev->BlockSize),\r
              BufferSize,\r
              Buffer\r
              );\r
  }\r
\r
  return Status;\r
}\r
\r
\r
/**\r
  Find a cache block designated to specific Block device and Lba.\r
  If not found, invalidate an oldest one and use it. (LRU cache)\r
\r
  @param  PrivateData       the global memory map.\r
  @param  BlockDeviceNo     the Block device.\r
  @param  Lba               the Logical Block Address\r
  @param  CachePtr          Ptr to the starting address of the memory holding the\r
                            data;\r
\r
  @retval EFI_SUCCESS       The function completed successfully.\r
  @retval EFI_DEVICE_ERROR  Something error while accessing media.\r
\r
**/\r
EFI_STATUS\r
FatGetCacheBlock (\r
  IN  PEI_FAT_PRIVATE_DATA  *PrivateData,\r
  IN  UINTN                 BlockDeviceNo,\r
  IN  UINT64                Lba,\r
  OUT CHAR8                 **CachePtr\r
  )\r
{\r
  EFI_STATUS            Status;\r
  PEI_FAT_CACHE_BUFFER  *CacheBuffer;\r
  INTN                  Index;\r
  STATIC UINT8          Seed;\r
\r
  Status      = EFI_SUCCESS;\r
  CacheBuffer = NULL;\r
\r
  //\r
  // go through existing cache buffers\r
  //\r
  for (Index = 0; Index < PEI_FAT_CACHE_SIZE; Index++) {\r
    CacheBuffer = &(PrivateData->CacheBuffer[Index]);\r
    if (CacheBuffer->Valid && CacheBuffer->BlockDeviceNo == BlockDeviceNo && CacheBuffer->Lba == Lba) {\r
      break;\r
    }\r
  }\r
\r
  if (Index < PEI_FAT_CACHE_SIZE) {\r
    *CachePtr = (CHAR8 *) CacheBuffer->Buffer;\r
    return EFI_SUCCESS;\r
  }\r
  //\r
  // We have to find an invalid cache buffer\r
  //\r
  for (Index = 0; Index < PEI_FAT_CACHE_SIZE; Index++) {\r
    if (!PrivateData->CacheBuffer[Index].Valid) {\r
      break;\r
    }\r
  }\r
  //\r
  // Use the cache buffer\r
  //\r
  if (Index == PEI_FAT_CACHE_SIZE) {\r
    Index = (Seed++) % PEI_FAT_CACHE_SIZE;\r
  }\r
\r
  //\r
  // Current device ID should be less than maximum device ID.\r
  //\r
  if (BlockDeviceNo >= PEI_FAT_MAX_BLOCK_DEVICE) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  CacheBuffer                 = &(PrivateData->CacheBuffer[Index]);\r
\r
  CacheBuffer->BlockDeviceNo  = BlockDeviceNo;\r
  CacheBuffer->Lba            = Lba;\r
  CacheBuffer->Size           = PrivateData->BlockDevice[BlockDeviceNo].BlockSize;\r
\r
  //\r
  // Read in the data\r
  //\r
  Status = FatReadBlock (\r
            PrivateData,\r
            BlockDeviceNo,\r
            Lba,\r
            CacheBuffer->Size,\r
            CacheBuffer->Buffer\r
            );\r
  if (EFI_ERROR (Status)) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  CacheBuffer->Valid  = TRUE;\r
  *CachePtr           = (CHAR8 *) CacheBuffer->Buffer;\r
\r
  return Status;\r
}\r
\r
\r
/**\r
  Disk reading.\r
\r
  @param  PrivateData       the global memory map;\r
  @param  BlockDeviceNo     the block device to read;\r
  @param  StartingAddress   the starting address.\r
  @param  Size              the amount of data to read.\r
  @param  Buffer            the buffer holding the data\r
\r
  @retval EFI_SUCCESS       The function completed successfully.\r
  @retval EFI_DEVICE_ERROR  Something error.\r
\r
**/\r
EFI_STATUS\r
FatReadDisk (\r
  IN  PEI_FAT_PRIVATE_DATA  *PrivateData,\r
  IN  UINTN                 BlockDeviceNo,\r
  IN  UINT64                StartingAddress,\r
  IN  UINTN                 Size,\r
  OUT VOID                  *Buffer\r
  )\r
{\r
  EFI_STATUS  Status;\r
  UINT32      BlockSize;\r
  CHAR8       *BufferPtr;\r
  CHAR8       *CachePtr;\r
  UINT32      Offset;\r
  UINT64      Lba;\r
  UINT64      OverRunLba;\r
  UINTN       Amount;\r
\r
  Status    = EFI_SUCCESS;\r
  BufferPtr = Buffer;\r
  BlockSize = PrivateData->BlockDevice[BlockDeviceNo].BlockSize;\r
\r
  //\r
  // Read underrun\r
  //\r
  Lba     = DivU64x32Remainder (StartingAddress, BlockSize, &Offset);\r
  Status  = FatGetCacheBlock (PrivateData, BlockDeviceNo, Lba, &CachePtr);\r
  if (EFI_ERROR (Status)) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  Amount = Size < (BlockSize - Offset) ? Size : (BlockSize - Offset);\r
  CopyMem (BufferPtr, CachePtr + Offset, Amount);\r
\r
  if (Size == Amount) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  Size -= Amount;\r
  BufferPtr += Amount;\r
  StartingAddress += Amount;\r
  Lba += 1;\r
\r
  //\r
  // Read aligned parts\r
  //\r
  OverRunLba = Lba + DivU64x32Remainder (Size, BlockSize, &Offset);\r
\r
  Size -= Offset;\r
  Status = FatReadBlock (PrivateData, BlockDeviceNo, Lba, Size, BufferPtr);\r
  if (EFI_ERROR (Status)) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  BufferPtr += Size;\r
\r
  //\r
  // Read overrun\r
  //\r
  if (Offset != 0) {\r
    Status = FatGetCacheBlock (PrivateData, BlockDeviceNo, OverRunLba, &CachePtr);\r
    if (EFI_ERROR (Status)) {\r
      return EFI_DEVICE_ERROR;\r
    }\r
\r
    CopyMem (BufferPtr, CachePtr, Offset);\r
  }\r
\r
  return Status;\r
}\r
\r
\r
/**\r
  This version is different from the version in Unicode collation\r
  protocol in that this version strips off trailing blanks.\r
  Converts an 8.3 FAT file name using an OEM character set\r
  to a Null-terminated Unicode string.\r
  Here does not expand DBCS FAT chars.\r
\r
  @param  FatSize           The size of the string Fat in bytes.\r
  @param  Fat               A pointer to a Null-terminated string that contains\r
                            an 8.3 file name using an OEM character set.\r
  @param  Str               A pointer to a Null-terminated Unicode string. The\r
                            string must be allocated in advance to hold FatSize\r
                            Unicode characters\r
\r
**/\r
VOID\r
EngFatToStr (\r
  IN UINTN                            FatSize,\r
  IN CHAR8                            *Fat,\r
  OUT CHAR16                          *Str\r
  )\r
{\r
  CHAR16  *String;\r
\r
  String = Str;\r
  //\r
  // No DBCS issues, just expand and add null terminate to end of string\r
  //\r
  while (*Fat != 0 && FatSize != 0) {\r
    if (*Fat == ' ') {\r
      break;\r
    }\r
    *String = *Fat;\r
    String += 1;\r
    Fat += 1;\r
    FatSize -= 1;\r
  }\r
\r
  *String = 0;\r
}\r
\r
\r
/**\r
  Performs a case-insensitive comparison of two Null-terminated Unicode strings.\r
\r
  @param  PrivateData       Global memory map for accessing global variables\r
  @param  Str1              First string to perform case insensitive comparison.\r
  @param  Str2              Second string to perform case insensitive comparison.\r
\r
**/\r
BOOLEAN\r
EngStriColl (\r
  IN  PEI_FAT_PRIVATE_DATA  *PrivateData,\r
  IN CHAR16                 *Str1,\r
  IN CHAR16                 *Str2\r
  )\r
{\r
  CHAR16  UpperS1;\r
  CHAR16  UpperS2;\r
\r
  UpperS1 = ToUpper (*Str1);\r
  UpperS2 = ToUpper (*Str2);\r
  while (*Str1 != 0) {\r
    if (UpperS1 != UpperS2) {\r
      return FALSE;\r
    }\r
\r
    Str1++;\r
    Str2++;\r
    UpperS1 = ToUpper (*Str1);\r
    UpperS2 = ToUpper (*Str2);\r
  }\r
\r
  return (BOOLEAN) ((*Str2 != 0) ? FALSE : TRUE);\r
}\r
Commit	Line	Data
2f4dfa84 JJ	1	/** @file\r
	2	General purpose supporting routines for FAT recovery PEIM\r
	3	\r
e38f26a2	4	Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
2f4dfa84 JJ	5	\r
	6	This program and the accompanying materials are licensed and made available\r
	7	under the terms and conditions of the BSD License which accompanies this\r
	8	distribution. The full text of the license may be found at\r
	9	http://opensource.org/licenses/bsd-license.php\r
	10	\r
	11	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	12	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	13	\r
	14	**/\r
	15	\r
	16	#include "FatLitePeim.h"\r
	17	\r
	18	\r
	19	#define CHAR_FAT_VALID 0x01\r
	20	\r
	21	\r
	22	/**\r
	23	Converts a union code character to upper case.\r
	24	This functions converts a unicode character to upper case.\r
	25	If the input Letter is not a lower-cased letter,\r
	26	the original value is returned.\r
	27	\r
e38f26a2	28	@param Letter The input unicode character.\r
2f4dfa84 JJ	29	\r
	30	@return The upper cased letter.\r
	31	\r
	32	**/\r
	33	CHAR16\r
	34	ToUpper (\r
	35	IN CHAR16 Letter\r
	36	)\r
	37	{\r
	38	if ('a' <= Letter && Letter <= 'z') {\r
	39	Letter = (CHAR16) (Letter - 0x20);\r
	40	}\r
	41	\r
	42	return Letter;\r
	43	}\r
	44	\r
	45	\r
	46	/**\r
	47	Reads a block of data from the block device by calling\r
	48	underlying Block I/O service.\r
	49	\r
e38f26a2 LG	50	@param PrivateData Global memory map for accessing global variables\r
	51	@param BlockDeviceNo The index for the block device number.\r
	52	@param Lba The logic block address to read data from.\r
	53	@param BufferSize The size of data in byte to read.\r
	54	@param Buffer The buffer of the\r
2f4dfa84	55	\r
e38f26a2 LG	56	@retval EFI_DEVICE_ERROR The specified block device number exceeds the maximum\r
	57	device number.\r
	58	@retval EFI_DEVICE_ERROR The maximum address has exceeded the maximum address\r
2f4dfa84 JJ	59	of the block device.\r
	60	\r
	61	**/\r
	62	EFI_STATUS\r
	63	FatReadBlock (\r
	64	IN PEI_FAT_PRIVATE_DATA *PrivateData,\r
	65	IN UINTN BlockDeviceNo,\r
	66	IN EFI_PEI_LBA Lba,\r
	67	IN UINTN BufferSize,\r
	68	OUT VOID *Buffer\r
	69	)\r
	70	{\r
	71	EFI_STATUS Status;\r
	72	PEI_FAT_BLOCK_DEVICE *BlockDev;\r
	73	\r
	74	if (BlockDeviceNo > PEI_FAT_MAX_BLOCK_DEVICE - 1) {\r
	75	return EFI_DEVICE_ERROR;\r
	76	}\r
	77	\r
	78	Status = EFI_SUCCESS;\r
	79	BlockDev = &(PrivateData->BlockDevice[BlockDeviceNo]);\r
	80	\r
	81	if (BufferSize > MultU64x32 (BlockDev->LastBlock - Lba + 1, BlockDev->BlockSize)) {\r
	82	return EFI_DEVICE_ERROR;\r
	83	}\r
	84	\r
	85	if (!BlockDev->Logical) {\r
	86	//\r
	87	// Status = BlockDev->ReadFunc\r
	88	// (PrivateData->PeiServices, BlockDev->PhysicalDevNo, Lba, BufferSize, Buffer);\r
	89	//\r
8a467be1 FT	90	if (BlockDev->BlockIo2 != NULL) {\r
	91	Status = BlockDev->BlockIo2->ReadBlocks (\r
	92	(EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),\r
	93	BlockDev->BlockIo2,\r
	94	BlockDev->PhysicalDevNo,\r
	95	Lba,\r
	96	BufferSize,\r
	97	Buffer\r
	98	);\r
	99	} else {\r
	100	Status = BlockDev->BlockIo->ReadBlocks (\r
2f4dfa84 JJ	101	(EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),\r
	102	BlockDev->BlockIo,\r
	103	BlockDev->PhysicalDevNo,\r
	104	Lba,\r
	105	BufferSize,\r
	106	Buffer\r
	107	);\r
8a467be1	108	}\r
2f4dfa84 JJ	109	\r
	110	} else {\r
	111	Status = FatReadDisk (\r
	112	PrivateData,\r
	113	BlockDev->ParentDevNo,\r
	114	BlockDev->StartingPos + MultU64x32 (Lba, BlockDev->BlockSize),\r
	115	BufferSize,\r
	116	Buffer\r
	117	);\r
	118	}\r
	119	\r
	120	return Status;\r
	121	}\r
	122	\r
	123	\r
	124	/**\r
	125	Find a cache block designated to specific Block device and Lba.\r
	126	If not found, invalidate an oldest one and use it. (LRU cache)\r
	127	\r
e38f26a2 LG	128	@param PrivateData the global memory map.\r
	129	@param BlockDeviceNo the Block device.\r
	130	@param Lba the Logical Block Address\r
	131	@param CachePtr Ptr to the starting address of the memory holding the\r
	132	data;\r
2f4dfa84 JJ	133	\r
	134	@retval EFI_SUCCESS The function completed successfully.\r
	135	@retval EFI_DEVICE_ERROR Something error while accessing media.\r
	136	\r
	137	**/\r
	138	EFI_STATUS\r
	139	FatGetCacheBlock (\r
	140	IN PEI_FAT_PRIVATE_DATA *PrivateData,\r
	141	IN UINTN BlockDeviceNo,\r
	142	IN UINT64 Lba,\r
	143	OUT CHAR8 **CachePtr\r
	144	)\r
	145	{\r
	146	EFI_STATUS Status;\r
	147	PEI_FAT_CACHE_BUFFER *CacheBuffer;\r
	148	INTN Index;\r
	149	STATIC UINT8 Seed;\r
	150	\r
	151	Status = EFI_SUCCESS;\r
	152	CacheBuffer = NULL;\r
	153	\r
	154	//\r
	155	// go through existing cache buffers\r
	156	//\r
	157	for (Index = 0; Index < PEI_FAT_CACHE_SIZE; Index++) {\r
	158	CacheBuffer = &(PrivateData->CacheBuffer[Index]);\r
	159	if (CacheBuffer->Valid && CacheBuffer->BlockDeviceNo == BlockDeviceNo && CacheBuffer->Lba == Lba) {\r
	160	break;\r
	161	}\r
	162	}\r
	163	\r
	164	if (Index < PEI_FAT_CACHE_SIZE) {\r
	165	CachePtr = (CHAR8 ) CacheBuffer->Buffer;\r
	166	return EFI_SUCCESS;\r
	167	}\r
	168	//\r
	169	// We have to find an invalid cache buffer\r
	170	//\r
	171	for (Index = 0; Index < PEI_FAT_CACHE_SIZE; Index++) {\r
	172	if (!PrivateData->CacheBuffer[Index].Valid) {\r
	173	break;\r
	174	}\r
	175	}\r
	176	//\r
	177	// Use the cache buffer\r
	178	//\r
	179	if (Index == PEI_FAT_CACHE_SIZE) {\r
	180	Index = (Seed++) % PEI_FAT_CACHE_SIZE;\r
	181	}\r
e38f26a2	182	\r
2f4dfa84	183	//\r
e38f26a2	184	// Current device ID should be less than maximum device ID.\r
2f4dfa84 JJ	185	//\r
	186	if (BlockDeviceNo >= PEI_FAT_MAX_BLOCK_DEVICE) {\r
	187	return EFI_DEVICE_ERROR;\r
	188	}\r
	189	\r
	190	CacheBuffer = &(PrivateData->CacheBuffer[Index]);\r
	191	\r
	192	CacheBuffer->BlockDeviceNo = BlockDeviceNo;\r
	193	CacheBuffer->Lba = Lba;\r
	194	CacheBuffer->Size = PrivateData->BlockDevice[BlockDeviceNo].BlockSize;\r
	195	\r
	196	//\r
	197	// Read in the data\r
	198	//\r
	199	Status = FatReadBlock (\r
	200	PrivateData,\r
	201	BlockDeviceNo,\r
	202	Lba,\r
	203	CacheBuffer->Size,\r
	204	CacheBuffer->Buffer\r
	205	);\r
	206	if (EFI_ERROR (Status)) {\r
	207	return EFI_DEVICE_ERROR;\r
	208	}\r
	209	\r
	210	CacheBuffer->Valid = TRUE;\r
	211	CachePtr = (CHAR8 ) CacheBuffer->Buffer;\r
	212	\r
	213	return Status;\r
	214	}\r
	215	\r
	216	\r
	217	/**\r
	218	Disk reading.\r
	219	\r
e38f26a2 LG	220	@param PrivateData the global memory map;\r
	221	@param BlockDeviceNo the block device to read;\r
	222	@param StartingAddress the starting address.\r
	223	@param Size the amount of data to read.\r
	224	@param Buffer the buffer holding the data\r
2f4dfa84 JJ	225	\r
	226	@retval EFI_SUCCESS The function completed successfully.\r
	227	@retval EFI_DEVICE_ERROR Something error.\r
	228	\r
	229	**/\r
	230	EFI_STATUS\r
	231	FatReadDisk (\r
	232	IN PEI_FAT_PRIVATE_DATA *PrivateData,\r
	233	IN UINTN BlockDeviceNo,\r
	234	IN UINT64 StartingAddress,\r
	235	IN UINTN Size,\r
	236	OUT VOID *Buffer\r
	237	)\r
	238	{\r
	239	EFI_STATUS Status;\r
	240	UINT32 BlockSize;\r
	241	CHAR8 *BufferPtr;\r
	242	CHAR8 *CachePtr;\r
	243	UINT32 Offset;\r
	244	UINT64 Lba;\r
	245	UINT64 OverRunLba;\r
	246	UINTN Amount;\r
	247	\r
	248	Status = EFI_SUCCESS;\r
	249	BufferPtr = Buffer;\r
	250	BlockSize = PrivateData->BlockDevice[BlockDeviceNo].BlockSize;\r
	251	\r
	252	//\r
	253	// Read underrun\r
	254	//\r
	255	Lba = DivU64x32Remainder (StartingAddress, BlockSize, &Offset);\r
	256	Status = FatGetCacheBlock (PrivateData, BlockDeviceNo, Lba, &CachePtr);\r
	257	if (EFI_ERROR (Status)) {\r
	258	return EFI_DEVICE_ERROR;\r
	259	}\r
	260	\r
	261	Amount = Size < (BlockSize - Offset) ? Size : (BlockSize - Offset);\r
	262	CopyMem (BufferPtr, CachePtr + Offset, Amount);\r
	263	\r
	264	if (Size == Amount) {\r
	265	return EFI_SUCCESS;\r
	266	}\r
	267	\r
	268	Size -= Amount;\r
	269	BufferPtr += Amount;\r
	270	StartingAddress += Amount;\r
	271	Lba += 1;\r
	272	\r
	273	//\r
	274	// Read aligned parts\r
	275	//\r
	276	OverRunLba = Lba + DivU64x32Remainder (Size, BlockSize, &Offset);\r
	277	\r
	278	Size -= Offset;\r
	279	Status = FatReadBlock (PrivateData, BlockDeviceNo, Lba, Size, BufferPtr);\r
	280	if (EFI_ERROR (Status)) {\r
	281	return EFI_DEVICE_ERROR;\r
	282	}\r
	283	\r
	284	BufferPtr += Size;\r
	285	\r
	286	//\r
	287	// Read overrun\r
	288	//\r
289	if (Offset != 0) {\r
290	Status = FatGetCacheBlock (PrivateData, BlockDeviceNo, OverRunLba, &CachePtr);\r
291	if (EFI_ERROR (Status)) {\r
292	return EFI_DEVICE_ERROR;\r
293	}\r
294	\r
295	CopyMem (BufferPtr, CachePtr, Offset);\r
296	}\r
297	\r
298	return Status;\r
299	}\r
300	\r
301	\r
302	/**\r
303	This version is different from the version in Unicode collation\r
304	protocol in that this version strips off trailing blanks.\r
305	Converts an 8.3 FAT file name using an OEM character set\r
306	to a Null-terminated Unicode string.\r
307	Here does not expand DBCS FAT chars.\r
308	\r
e38f26a2 LG	309	@param FatSize The size of the string Fat in bytes.\r
	310	@param Fat A pointer to a Null-terminated string that contains\r
	311	an 8.3 file name using an OEM character set.\r
	312	@param Str A pointer to a Null-terminated Unicode string. The\r
	313	string must be allocated in advance to hold FatSize\r
2f4dfa84 JJ	314	Unicode characters\r
	315	\r
	316	**/\r
	317	VOID\r
	318	EngFatToStr (\r
	319	IN UINTN FatSize,\r
	320	IN CHAR8 *Fat,\r
	321	OUT CHAR16 *Str\r
	322	)\r
	323	{\r
	324	CHAR16 *String;\r
	325	\r
	326	String = Str;\r
	327	//\r
	328	// No DBCS issues, just expand and add null terminate to end of string\r
	329	//\r
	330	while (*Fat != 0 && FatSize != 0) {\r
3ba5368d SZ	331	if (*Fat == ' ') {\r
	332	break;\r
	333	}\r
2f4dfa84 JJ	334	String = Fat;\r
	335	String += 1;\r
	336	Fat += 1;\r
	337	FatSize -= 1;\r
2f4dfa84	338	}\r
3ba5368d SZ	339	\r
3ba5368d SZ	340	*String = 0;\r
2f4dfa84 JJ	341	}\r
	342	\r
	343	\r
	344	/**\r
	345	Performs a case-insensitive comparison of two Null-terminated Unicode strings.\r
	346	\r
e38f26a2 LG	347	@param PrivateData Global memory map for accessing global variables\r
e38f26a2 LG	348	@param Str1 First string to perform case insensitive comparison.\r
2f4dfa84 JJ	349	@param Str2 Second string to perform case insensitive comparison.\r
	350	\r
	351	**/\r
	352	BOOLEAN\r
	353	EngStriColl (\r
	354	IN PEI_FAT_PRIVATE_DATA *PrivateData,\r
	355	IN CHAR16 *Str1,\r
	356	IN CHAR16 *Str2\r
	357	)\r
	358	{\r
	359	CHAR16 UpperS1;\r
	360	CHAR16 UpperS2;\r
	361	\r
	362	UpperS1 = ToUpper (*Str1);\r
	363	UpperS2 = ToUpper (*Str2);\r
	364	while (*Str1 != 0) {\r
	365	if (UpperS1 != UpperS2) {\r
	366	return FALSE;\r
	367	}\r
	368	\r
	369	Str1++;\r
	370	Str2++;\r
	371	UpperS1 = ToUpper (*Str1);\r
	372	UpperS2 = ToUpper (*Str2);\r
	373	}\r
	374	\r
	375	return (BOOLEAN) ((*Str2 != 0) ? FALSE : TRUE);\r
	376	}\r