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

/** @file\r
  General purpose supporting routines for FAT recovery PEIM\r
\r
Copyright (c) 2006 - 2013, 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
    Status = BlockDev->BlockIo->ReadBlocks (\r
                                  (EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),\r
                                  BlockDev->BlockIo,\r
                                  BlockDev->PhysicalDevNo,\r
                                  Lba,\r
                                  BufferSize,\r
                                  Buffer\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
3ba5368d	4	Copyright (c) 2006 - 2013, 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
	28	@param Letter The input unicode character. \r
	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
	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
	55	\r
	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
	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
90	Status = BlockDev->BlockIo->ReadBlocks (\r
91	(EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),\r
92	BlockDev->BlockIo,\r
93	BlockDev->PhysicalDevNo,\r
94	Lba,\r
95	BufferSize,\r
96	Buffer\r
97	);\r
98	\r
99	} else {\r
100	Status = FatReadDisk (\r
101	PrivateData,\r
102	BlockDev->ParentDevNo,\r
103	BlockDev->StartingPos + MultU64x32 (Lba, BlockDev->BlockSize),\r
104	BufferSize,\r
105	Buffer\r
106	);\r
107	}\r
108	\r
109	return Status;\r
110	}\r
111	\r
112	\r
113	/**\r
114	Find a cache block designated to specific Block device and Lba.\r
115	If not found, invalidate an oldest one and use it. (LRU cache)\r
116	\r
117	@param PrivateData the global memory map. \r
118	@param BlockDeviceNo the Block device. \r
119	@param Lba the Logical Block Address \r
120	@param CachePtr Ptr to the starting address of the memory holding the \r
121	data; \r
122	\r
123	@retval EFI_SUCCESS The function completed successfully.\r
124	@retval EFI_DEVICE_ERROR Something error while accessing media.\r
125	\r
126	**/\r
127	EFI_STATUS\r
128	FatGetCacheBlock (\r
129	IN PEI_FAT_PRIVATE_DATA *PrivateData,\r
130	IN UINTN BlockDeviceNo,\r
131	IN UINT64 Lba,\r
132	OUT CHAR8 **CachePtr\r
133	)\r
134	{\r
135	EFI_STATUS Status;\r
136	PEI_FAT_CACHE_BUFFER *CacheBuffer;\r
137	INTN Index;\r
138	STATIC UINT8 Seed;\r
139	\r
140	Status = EFI_SUCCESS;\r
141	CacheBuffer = NULL;\r
142	\r
143	//\r
144	// go through existing cache buffers\r
145	//\r
146	for (Index = 0; Index < PEI_FAT_CACHE_SIZE; Index++) {\r
147	CacheBuffer = &(PrivateData->CacheBuffer[Index]);\r
148	if (CacheBuffer->Valid && CacheBuffer->BlockDeviceNo == BlockDeviceNo && CacheBuffer->Lba == Lba) {\r
149	break;\r
150	}\r
151	}\r
152	\r
153	if (Index < PEI_FAT_CACHE_SIZE) {\r
154	CachePtr = (CHAR8 ) CacheBuffer->Buffer;\r
155	return EFI_SUCCESS;\r
156	}\r
157	//\r
158	// We have to find an invalid cache buffer\r
159	//\r
160	for (Index = 0; Index < PEI_FAT_CACHE_SIZE; Index++) {\r
161	if (!PrivateData->CacheBuffer[Index].Valid) {\r
162	break;\r
163	}\r
164	}\r
165	//\r
166	// Use the cache buffer\r
167	//\r
168	if (Index == PEI_FAT_CACHE_SIZE) {\r
169	Index = (Seed++) % PEI_FAT_CACHE_SIZE;\r
170	}\r
171	\r
172	//\r
173	// Current device ID should be less than maximum device ID. \r
174	//\r
175	if (BlockDeviceNo >= PEI_FAT_MAX_BLOCK_DEVICE) {\r
176	return EFI_DEVICE_ERROR;\r
177	}\r
178	\r
179	CacheBuffer = &(PrivateData->CacheBuffer[Index]);\r
180	\r
181	CacheBuffer->BlockDeviceNo = BlockDeviceNo;\r
182	CacheBuffer->Lba = Lba;\r
183	CacheBuffer->Size = PrivateData->BlockDevice[BlockDeviceNo].BlockSize;\r
184	\r
185	//\r
186	// Read in the data\r
187	//\r
188	Status = FatReadBlock (\r
189	PrivateData,\r
190	BlockDeviceNo,\r
191	Lba,\r
192	CacheBuffer->Size,\r
193	CacheBuffer->Buffer\r
194	);\r
195	if (EFI_ERROR (Status)) {\r
196	return EFI_DEVICE_ERROR;\r
197	}\r
198	\r
199	CacheBuffer->Valid = TRUE;\r
200	CachePtr = (CHAR8 ) CacheBuffer->Buffer;\r
201	\r
202	return Status;\r
203	}\r
204	\r
205	\r
206	/**\r
207	Disk reading.\r
208	\r
209	@param PrivateData the global memory map; \r
210	@param BlockDeviceNo the block device to read; \r
211	@param StartingAddress the starting address. \r
212	@param Size the amount of data to read. \r
213	@param Buffer the buffer holding the data \r
214	\r
215	@retval EFI_SUCCESS The function completed successfully.\r
216	@retval EFI_DEVICE_ERROR Something error.\r
217	\r
218	**/\r
219	EFI_STATUS\r
220	FatReadDisk (\r
221	IN PEI_FAT_PRIVATE_DATA *PrivateData,\r
222	IN UINTN BlockDeviceNo,\r
223	IN UINT64 StartingAddress,\r
224	IN UINTN Size,\r
225	OUT VOID *Buffer\r
226	)\r
227	{\r
228	EFI_STATUS Status;\r
229	UINT32 BlockSize;\r
230	CHAR8 *BufferPtr;\r
231	CHAR8 *CachePtr;\r
232	UINT32 Offset;\r
233	UINT64 Lba;\r
234	UINT64 OverRunLba;\r
235	UINTN Amount;\r
236	\r
237	Status = EFI_SUCCESS;\r
238	BufferPtr = Buffer;\r
239	BlockSize = PrivateData->BlockDevice[BlockDeviceNo].BlockSize;\r
240	\r
241	//\r
242	// Read underrun\r
243	//\r
244	Lba = DivU64x32Remainder (StartingAddress, BlockSize, &Offset);\r
245	Status = FatGetCacheBlock (PrivateData, BlockDeviceNo, Lba, &CachePtr);\r
246	if (EFI_ERROR (Status)) {\r
247	return EFI_DEVICE_ERROR;\r
248	}\r
249	\r
250	Amount = Size < (BlockSize - Offset) ? Size : (BlockSize - Offset);\r
251	CopyMem (BufferPtr, CachePtr + Offset, Amount);\r
252	\r
253	if (Size == Amount) {\r
254	return EFI_SUCCESS;\r
255	}\r
256	\r
257	Size -= Amount;\r
258	BufferPtr += Amount;\r
259	StartingAddress += Amount;\r
260	Lba += 1;\r
261	\r
262	//\r
263	// Read aligned parts\r
264	//\r
265	OverRunLba = Lba + DivU64x32Remainder (Size, BlockSize, &Offset);\r
266	\r
267	Size -= Offset;\r
268	Status = FatReadBlock (PrivateData, BlockDeviceNo, Lba, Size, BufferPtr);\r
269	if (EFI_ERROR (Status)) {\r
270	return EFI_DEVICE_ERROR;\r
271	}\r
272	\r
273	BufferPtr += Size;\r
274	\r
275	//\r
276	// Read overrun\r
277	//\r
278	if (Offset != 0) {\r
279	Status = FatGetCacheBlock (PrivateData, BlockDeviceNo, OverRunLba, &CachePtr);\r
280	if (EFI_ERROR (Status)) {\r
281	return EFI_DEVICE_ERROR;\r
282	}\r
283	\r
284	CopyMem (BufferPtr, CachePtr, Offset);\r
285	}\r
286	\r
287	return Status;\r
288	}\r
289	\r
290	\r
291	/**\r
292	This version is different from the version in Unicode collation\r
293	protocol in that this version strips off trailing blanks.\r
294	Converts an 8.3 FAT file name using an OEM character set\r
295	to a Null-terminated Unicode string.\r
296	Here does not expand DBCS FAT chars.\r
297	\r
298	@param FatSize The size of the string Fat in bytes. \r
299	@param Fat A pointer to a Null-terminated string that contains \r
300	an 8.3 file name using an OEM character set. \r
301	@param Str A pointer to a Null-terminated Unicode string. The \r
302	string must be allocated in advance to hold FatSize \r
303	Unicode characters\r
304	\r
305	**/\r
306	VOID\r
307	EngFatToStr (\r
308	IN UINTN FatSize,\r
309	IN CHAR8 *Fat,\r
310	OUT CHAR16 *Str\r
311	)\r
312	{\r
313	CHAR16 *String;\r
314	\r
315	String = Str;\r
316	//\r
317	// No DBCS issues, just expand and add null terminate to end of string\r
318	//\r
319	while (*Fat != 0 && FatSize != 0) {\r
3ba5368d SZ	320	if (*Fat == ' ') {\r
	321	break;\r
	322	}\r
2f4dfa84 JJ	323	String = Fat;\r
	324	String += 1;\r
	325	Fat += 1;\r
	326	FatSize -= 1;\r
2f4dfa84	327	}\r
3ba5368d SZ	328	\r
3ba5368d SZ	329	*String = 0;\r
2f4dfa84 JJ	330	}\r
	331	\r
	332	\r
	333	/**\r
	334	Performs a case-insensitive comparison of two Null-terminated Unicode strings.\r
	335	\r
	336	@param PrivateData Global memory map for accessing global variables \r
	337	@param Str1 First string to perform case insensitive comparison. \r
	338	@param Str2 Second string to perform case insensitive comparison.\r
	339	\r
	340	**/\r
	341	BOOLEAN\r
	342	EngStriColl (\r
	343	IN PEI_FAT_PRIVATE_DATA *PrivateData,\r
	344	IN CHAR16 *Str1,\r
	345	IN CHAR16 *Str2\r
	346	)\r
	347	{\r
	348	CHAR16 UpperS1;\r
	349	CHAR16 UpperS2;\r
	350	\r
	351	UpperS1 = ToUpper (*Str1);\r
	352	UpperS2 = ToUpper (*Str2);\r
	353	while (*Str1 != 0) {\r
	354	if (UpperS1 != UpperS2) {\r
	355	return FALSE;\r
	356	}\r
	357	\r
	358	Str1++;\r
	359	Str2++;\r
	360	UpperS1 = ToUpper (*Str1);\r
	361	UpperS2 = ToUpper (*Str2);\r
	362	}\r
	363	\r
	364	return (BOOLEAN) ((*Str2 != 0) ? FALSE : TRUE);\r
	365	}\r