[mirror_edk2.git] / EmbeddedPkg / Include / Library / EfiFileLib.h

/** @file\r
  Library functions that perform file IO. Memory buffer, file system, and \r
  fimrware volume operations are supproted. \r
\r
  Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>\r
  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
\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
  Basic support for opening files on different device types. The device string\r
  is in the form of DevType:Path. Current DevType is required as there is no\r
  current mounted device concept of current working directory concept implement\r
  by this library.\r
\r
  Device names are case insensative and only check the leading characters for \r
  unique matches. Thus the following are all the same:\r
    LoadFile0:\r
    l0:\r
    L0:\r
    Lo0:\r
\r
  Supported Device Names:\r
  A0x1234:0x12 - A memory buffer starting at address 0x1234 for 0x12 bytes\r
  l1:          - EFI LoadFile device one.\r
  B0:          - EFI BlockIo zero.\r
  fs3:         - EFI Simple File System device 3\r
  Fv2:         - EFI Firmware VOlume device 2\r
  1.2.3.4:name - TFTP IP and file name\r
  \r
**/\r
\r
#ifndef __EFI_FILE_LIB_H__\r
#define __EFI_FILE_LIB_H__\r
\r
#include <PiDxe.h>\r
#include <Protocol/FirmwareVolume2.h>\r
#include <Protocol/FirmwareVolumeBlock.h>\r
#include <Protocol/BlockIo.h>\r
#include <Protocol/LoadFile.h>\r
#include <Protocol/LoadFile.h>\r
#include <Protocol/SimpleFileSystem.h>\r
#include <Guid/FileInfo.h>\r
#include <Guid/FileSystemInfo.h>\r
\r
#define MAX_PATHNAME    0x200\r
\r
/// Type of the file that has been opened \r
typedef enum {\r
  EfiOpenLoadFile,\r
  EfiOpenMemoryBuffer,\r
  EfiOpenFirmwareVolume,\r
  EfiOpenFileSystem,\r
  EfiOpenBlockIo,\r
  EfiOpenTftp,\r
  EfiOpenMaxValue\r
} EFI_OPEN_FILE_TYPE;\r
\r
\r
/// Public information about the open file\r
typedef struct {\r
  UINTN                         Version;          // Common information        \r
  EFI_OPEN_FILE_TYPE            Type;\r
  EFI_DEVICE_PATH_PROTOCOL      *DevicePath;\r
  EFI_STATUS                    LastError;\r
  EFI_HANDLE                    EfiHandle;        \r
  CHAR8                         *DeviceName;\r
  CHAR8                         *FileName;\r
\r
  UINT64                        CurrentPosition;  // Information for Seek\r
  UINT64                        MaxPosition;\r
\r
  UINTN                         BaseOffset;       // Base offset for hexdump command\r
 \r
  UINTN                         Size;             // Valid for all types other than l#:\r
  UINT8                         *Buffer;          // Information valid for A#:\r
\r
  EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv;              // Information valid for Fv#: \r
  EFI_GUID                      FvNameGuid;       \r
  EFI_SECTION_TYPE              FvSectionType;    \r
  EFI_FV_FILETYPE               FvType;           \r
  EFI_FV_FILE_ATTRIBUTES        FvAttributes;     \r
\r
  EFI_PHYSICAL_ADDRESS          FvStart;          \r
  UINTN                         FvSize;      \r
  UINTN                         FvHeaderSize;\r
\r
  EFI_FILE                      *FsFileHandle;    // Information valid for Fs#:\r
  EFI_FILE_SYSTEM_INFO          *FsInfo;\r
  EFI_FILE_INFO                 *FsFileInfo;\r
  EFI_BLOCK_IO_MEDIA            FsBlockIoMedia;   // Information valid for Fs#: or B#:\r
\r
  UINTN                         DiskOffset;       // Information valid for B#:\r
\r
  EFI_LOAD_FILE_PROTOCOL        *LoadFile;        // Information valid for l#:\r
  \r
  EFI_IP_ADDRESS                ServerIp;         // Information valid for t:\r
  BOOLEAN                       IsDirty;\r
  BOOLEAN                       IsBufferValid;\r
                           \r
} EFI_OPEN_FILE;\r
\r
\r
/// Type of Seek to perform\r
typedef enum {\r
  EfiSeekStart,\r
  EfiSeekCurrent,\r
  EfiSeekEnd,\r
  EfiSeekMax\r
} EFI_SEEK_TYPE;\r
\r
\r
/**\r
  Open a device named by PathName. The PathName includes a device name and \r
  path seperated by a :. See file header for more details on the PathName \r
  syntax. There is no checking to prevent a file from being opened more than\r
  one type. \r
\r
  SectionType is only used to open an FV. Each file in an FV contains multiple\r
  secitons and only the SectionType section is opened. \r
\r
  For any file that is opened with EfiOpen() must be closed with EfiClose().\r
\r
  @param  PathName    Path to parse to open \r
  @param  OpenMode    Same as EFI_FILE.Open()\r
  @param  SectionType Section in FV to open.\r
\r
  @return NULL  Open failed\r
  @return Valid EFI_OPEN_FILE handle\r
\r
**/\r
EFI_OPEN_FILE *\r
EfiOpen (\r
  IN        CHAR8               *PathName,\r
  IN  CONST UINT64              OpenMode,\r
  IN  CONST EFI_SECTION_TYPE    SectionType\r
  );\r
\r
EFI_STATUS\r
EfiCopyFile (\r
  IN        CHAR8               *DestinationFile,\r
  IN        CHAR8               *SourceFile\r
  );\r
\r
/**\r
  Use DeviceType and Index to form a valid PathName and try and open it.\r
\r
  @param  DeviceType  Device type to open\r
  @param  Index       Device Index to use. Zero relative.\r
\r
  @return NULL  Open failed\r
  @return Valid EFI_OPEN_FILE handle\r
\r
**/\r
EFI_OPEN_FILE  *\r
EfiDeviceOpenByType (\r
  IN  EFI_OPEN_FILE_TYPE    DeviceType,\r
  IN  UINTN                 Index\r
  );\r
\r
\r
/**\r
  Close a file handle opened by EfiOpen() and free all resources allocated by\r
  EfiOpen().\r
\r
  @param  Stream    Open File Handle\r
\r
  @return EFI_INVALID_PARAMETER  Stream is not an Open File\r
  @return EFI_SUCCESS            Steam closed\r
\r
**/\r
EFI_STATUS\r
EfiClose (\r
  IN  EFI_OPEN_FILE     *Stream\r
  );\r
\r
\r
/**\r
  Return the size of the file represented by Stream. Also return the current \r
  Seek position. Opening a file will enable a valid file size to be returned.\r
  LoadFile is an exception as a load file size is set to zero. \r
\r
  @param  Stream    Open File Handle\r
\r
  @return 0         Stream is not an Open File or a valid LoadFile handle\r
\r
**/\r
UINTN\r
EfiTell (\r
  IN  EFI_OPEN_FILE     *Stream,\r
  OUT UINT64            *CurrentPosition   OPTIONAL\r
  );\r
\r
\r
/**\r
  Seek to the Offset locaiton in the file. LoadFile and FV device types do\r
  not support EfiSeek(). It is not possible to grow the file size using \r
  EfiSeek().\r
  \r
  SeekType defines how use Offset to calculate the new file position:\r
  EfiSeekStart  : Position = Offset\r
  EfiSeekCurrent: Position is Offset bytes from the current position\r
  EfiSeekEnd    : Only supported if Offset is zero to seek to end of file.\r
\r
  @param  Stream    Open File Handle\r
  @param  Offset    Offset to seek too. \r
  @param  SeekType  Type of seek to perform\r
\r
\r
  @return EFI_INVALID_PARAMETER  Stream is not an Open File\r
  @return EFI_UNSUPPORTED        LoadFile and FV doe not support Seek\r
  @return EFI_NOT_FOUND          Seek past the end of the file.\r
  @return EFI_SUCCESS            Steam closed\r
\r
**/\r
EFI_STATUS\r
EfiSeek (\r
  IN  EFI_OPEN_FILE     *Stream,\r
  IN  EFI_LBA           Offset,\r
  IN  EFI_SEEK_TYPE     SeekType\r
  );\r
\r
\r
/**\r
  Read BufferSize bytes from the current locaiton in the file. For load file\r
  and FV case you must read the entire file. \r
\r
  @param  Stream      Open File Handle\r
  @param  Buffer      Caller allocated buffer. \r
  @param  BufferSize  Size of buffer in bytes.\r
\r
\r
  @return EFI_SUCCESS           Stream is not an Open File\r
  @return EFI_END_OF_FILE Tried to read past the end of the file\r
  @return EFI_INVALID_PARAMETER Stream is not an open file handle\r
  @return EFI_BUFFER_TOO_SMALL  Buffer is not big enough to do the read\r
  @return "other"               Error returned from device read\r
\r
**/\r
EFI_STATUS\r
EfiRead (\r
  IN  EFI_OPEN_FILE     *Stream,\r
  OUT VOID              *Buffer,\r
  OUT UINTN             *BufferSize\r
  );\r
\r
\r
/**\r
  Read the entire file into a buffer. This routine allocates the buffer and\r
  returns it to the user full of the read data. \r
\r
  This is very useful for load flie where it's hard to know how big the buffer\r
  must be.\r
\r
  @param  Stream      Open File Handle\r
  @param  Buffer      Pointer to buffer to return. \r
  @param  BufferSize  Pointer to Size of buffer return..\r
\r
\r
  @return EFI_SUCCESS           Stream is not an Open File\r
  @return EFI_END_OF_FILE       Tried to read past the end of the file\r
  @return EFI_INVALID_PARAMETER Stream is not an open file handle\r
  @return EFI_BUFFER_TOO_SMALL  Buffer is not big enough to do the read\r
  @return "other"               Error returned from device read\r
\r
**/\r
EFI_STATUS\r
EfiReadAllocatePool (\r
  IN  EFI_OPEN_FILE     *Stream,\r
  OUT VOID              **Buffer,\r
  OUT UINTN             *BufferSize\r
  );\r
\r
\r
/**\r
  Write data back to the file. \r
\r
  @param  Stream      Open File Handle\r
  @param  Buffer      Pointer to buffer to return. \r
  @param  BufferSize  Pointer to Size of buffer return..\r
\r
\r
  @return EFI_SUCCESS           Stream is not an Open File\r
  @return EFI_END_OF_FILE       Tried to read past the end of the file\r
  @return EFI_INVALID_PARAMETER Stream is not an open file handle\r
  @return EFI_BUFFER_TOO_SMALL  Buffer is not big enough to do the read\r
  @return "other"               Error returned from device write\r
\r
**/\r
EFI_STATUS\r
EfiWrite (\r
  IN  EFI_OPEN_FILE   *Stream,\r
  OUT VOID            *Buffer,\r
  OUT UINTN           *BufferSize\r
  );\r
\r
\r
/**\r
  Return the number of devices of the current type active in the system\r
\r
  @param  Type      Device type to check\r
\r
  @return 0         Invalid type\r
\r
**/\r
UINTN\r
EfiGetDeviceCounts (\r
  IN  EFI_OPEN_FILE_TYPE     Type\r
  );\r
  \r
\r
/**\r
  Set the Curent Working Directory (CWD). If a call is made to EfiOpen () and \r
  the path does not contain a device name, The CWD is prepended to the path.\r
  \r
  @param  Cwd     Current Working Directory to set\r
\r
\r
  @return EFI_SUCCESS           CWD is set\r
  @return EFI_INVALID_PARAMETER Cwd is not a valid device:path\r
\r
**/\r
EFI_STATUS\r
EfiSetCwd (\r
  IN  CHAR8   *Cwd\r
  );  \r
\r
/**\r
  Set the Curent Working Directory (CWD). If a call is made to EfiOpen () and \r
  the path does not contain a device name, The CWD is prepended to the path.\r
  \r
  @param  Cwd     Current Working Directory \r
\r
\r
  @return NULL    No CWD set\r
  @return 'other' malloc'ed buffer contains CWD.\r
  \r
**/\r
CHAR8 *\r
EfiGetCwd (\r
  VOID\r
  );  \r
\r
#endif\r
Commit	Line	Data
2ef2b01e A	1	/** @file\r
	2	Library functions that perform file IO. Memory buffer, file system, and \r
	3	fimrware volume operations are supproted. \r
	4	\r
60274cca HT	5	Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>\r
60274cca HT	6	Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
2ef2b01e	7	\r
60274cca	8	This program and the accompanying materials\r
2ef2b01e A	9	are licensed and made available under the terms and conditions of the BSD License\r
	10	which accompanies this distribution. The full text of the license may be found at\r
	11	http://opensource.org/licenses/bsd-license.php\r
	12	\r
	13	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	14	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	15	\r
	16	Basic support for opening files on different device types. The device string\r
	17	is in the form of DevType:Path. Current DevType is required as there is no\r
	18	current mounted device concept of current working directory concept implement\r
	19	by this library.\r
	20	\r
	21	Device names are case insensative and only check the leading characters for \r
	22	unique matches. Thus the following are all the same:\r
	23	LoadFile0:\r
	24	l0:\r
	25	L0:\r
	26	Lo0:\r
	27	\r
	28	Supported Device Names:\r
	29	A0x1234:0x12 - A memory buffer starting at address 0x1234 for 0x12 bytes\r
	30	l1: - EFI LoadFile device one.\r
	31	B0: - EFI BlockIo zero.\r
	32	fs3: - EFI Simple File System device 3\r
	33	Fv2: - EFI Firmware VOlume device 2\r
	34	1.2.3.4:name - TFTP IP and file name\r
	35	\r
	36	**/\r
	37	\r
	38	#ifndef __EFI_FILE_LIB_H__\r
	39	#define __EFI_FILE_LIB_H__\r
	40	\r
	41	#include <PiDxe.h>\r
	42	#include <Protocol/FirmwareVolume2.h>\r
	43	#include <Protocol/FirmwareVolumeBlock.h>\r
	44	#include <Protocol/BlockIo.h>\r
	45	#include <Protocol/LoadFile.h>\r
	46	#include <Protocol/LoadFile.h>\r
	47	#include <Protocol/SimpleFileSystem.h>\r
	48	#include <Guid/FileInfo.h>\r
	49	#include <Guid/FileSystemInfo.h>\r
	50	\r
	51	#define MAX_PATHNAME 0x200\r
	52	\r
	53	/// Type of the file that has been opened \r
	54	typedef enum {\r
	55	EfiOpenLoadFile,\r
	56	EfiOpenMemoryBuffer,\r
	57	EfiOpenFirmwareVolume,\r
	58	EfiOpenFileSystem,\r
	59	EfiOpenBlockIo,\r
	60	EfiOpenTftp,\r
	61	EfiOpenMaxValue\r
	62	} EFI_OPEN_FILE_TYPE;\r
	63	\r
	64	\r
	65	/// Public information about the open file\r
	66	typedef struct {\r
	67	UINTN Version; // Common information \r
	68	EFI_OPEN_FILE_TYPE Type;\r
	69	EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
	70	EFI_STATUS LastError;\r
	71	EFI_HANDLE EfiHandle; \r
	72	CHAR8 *DeviceName;\r
73	CHAR8 *FileName;\r
74	\r
75	UINT64 CurrentPosition; // Information for Seek\r
76	UINT64 MaxPosition;\r
77	\r
78	UINTN BaseOffset; // Base offset for hexdump command\r
79	\r
80	UINTN Size; // Valid for all types other than l#:\r
81	UINT8 *Buffer; // Information valid for A#:\r
82	\r
83	EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv; // Information valid for Fv#: \r
84	EFI_GUID FvNameGuid; \r
85	EFI_SECTION_TYPE FvSectionType; \r
86	EFI_FV_FILETYPE FvType; \r
87	EFI_FV_FILE_ATTRIBUTES FvAttributes; \r
88	\r
89	EFI_PHYSICAL_ADDRESS FvStart; \r
60428d00	90	UINTN FvSize; \r
60428d00	91	UINTN FvHeaderSize;\r
2ef2b01e A	92	\r
	93	EFI_FILE *FsFileHandle; // Information valid for Fs#:\r
	94	EFI_FILE_SYSTEM_INFO *FsInfo;\r
	95	EFI_FILE_INFO *FsFileInfo;\r
	96	EFI_BLOCK_IO_MEDIA FsBlockIoMedia; // Information valid for Fs#: or B#:\r
	97	\r
	98	UINTN DiskOffset; // Information valid for B#:\r
	99	\r
	100	EFI_LOAD_FILE_PROTOCOL *LoadFile; // Information valid for l#:\r
	101	\r
	102	EFI_IP_ADDRESS ServerIp; // Information valid for t:\r
	103	BOOLEAN IsDirty;\r
	104	BOOLEAN IsBufferValid;\r
	105	\r
	106	} EFI_OPEN_FILE;\r
	107	\r
	108	\r
	109	/// Type of Seek to perform\r
	110	typedef enum {\r
	111	EfiSeekStart,\r
	112	EfiSeekCurrent,\r
	113	EfiSeekEnd,\r
	114	EfiSeekMax\r
	115	} EFI_SEEK_TYPE;\r
	116	\r
	117	\r
	118	/**\r
	119	Open a device named by PathName. The PathName includes a device name and \r
	120	path seperated by a :. See file header for more details on the PathName \r
	121	syntax. There is no checking to prevent a file from being opened more than\r
	122	one type. \r
	123	\r
	124	SectionType is only used to open an FV. Each file in an FV contains multiple\r
	125	secitons and only the SectionType section is opened. \r
	126	\r
	127	For any file that is opened with EfiOpen() must be closed with EfiClose().\r
	128	\r
	129	@param PathName Path to parse to open \r
	130	@param OpenMode Same as EFI_FILE.Open()\r
	131	@param SectionType Section in FV to open.\r
	132	\r
	133	@return NULL Open failed\r
	134	@return Valid EFI_OPEN_FILE handle\r
	135	\r
	136	**/\r
	137	EFI_OPEN_FILE *\r
	138	EfiOpen (\r
	139	IN CHAR8 *PathName,\r
	140	IN CONST UINT64 OpenMode,\r
	141	IN CONST EFI_SECTION_TYPE SectionType\r
	142	);\r
	143	\r
	144	EFI_STATUS\r
	145	EfiCopyFile (\r
	146	IN CHAR8 *DestinationFile,\r
	147	IN CHAR8 *SourceFile\r
	148	);\r
	149	\r
	150	/**\r
	151	Use DeviceType and Index to form a valid PathName and try and open it.\r
	152	\r
	153	@param DeviceType Device type to open\r
	154	@param Index Device Index to use. Zero relative.\r
	155	\r
156	@return NULL Open failed\r
157	@return Valid EFI_OPEN_FILE handle\r
158	\r
159	**/\r
160	EFI_OPEN_FILE *\r
161	EfiDeviceOpenByType (\r
162	IN EFI_OPEN_FILE_TYPE DeviceType,\r
163	IN UINTN Index\r
164	);\r
165	\r
166	\r
167	/**\r
168	Close a file handle opened by EfiOpen() and free all resources allocated by\r
169	EfiOpen().\r
170	\r
171	@param Stream Open File Handle\r
172	\r
173	@return EFI_INVALID_PARAMETER Stream is not an Open File\r
174	@return EFI_SUCCESS Steam closed\r
175	\r
176	**/\r
177	EFI_STATUS\r
178	EfiClose (\r
179	IN EFI_OPEN_FILE *Stream\r
180	);\r
181	\r
182	\r
183	/**\r
184	Return the size of the file represented by Stream. Also return the current \r
185	Seek position. Opening a file will enable a valid file size to be returned.\r
186	LoadFile is an exception as a load file size is set to zero. \r
187	\r
188	@param Stream Open File Handle\r
189	\r
190	@return 0 Stream is not an Open File or a valid LoadFile handle\r
191	\r
192	**/\r
193	UINTN\r
194	EfiTell (\r
195	IN EFI_OPEN_FILE *Stream,\r
196	OUT UINT64 *CurrentPosition OPTIONAL\r
197	);\r
198	\r
199	\r
200	/**\r
201	Seek to the Offset locaiton in the file. LoadFile and FV device types do\r
202	not support EfiSeek(). It is not possible to grow the file size using \r
203	EfiSeek().\r
204	\r
205	SeekType defines how use Offset to calculate the new file position:\r
206	EfiSeekStart : Position = Offset\r
207	EfiSeekCurrent: Position is Offset bytes from the current position\r
208	EfiSeekEnd : Only supported if Offset is zero to seek to end of file.\r
209	\r
210	@param Stream Open File Handle\r
211	@param Offset Offset to seek too. \r
212	@param SeekType Type of seek to perform\r
213	\r
214	\r
215	@return EFI_INVALID_PARAMETER Stream is not an Open File\r
216	@return EFI_UNSUPPORTED LoadFile and FV doe not support Seek\r
217	@return EFI_NOT_FOUND Seek past the end of the file.\r
218	@return EFI_SUCCESS Steam closed\r
219	\r
220	**/\r
221	EFI_STATUS\r
222	EfiSeek (\r
223	IN EFI_OPEN_FILE *Stream,\r
224	IN EFI_LBA Offset,\r
225	IN EFI_SEEK_TYPE SeekType\r
226	);\r
227	\r
228	\r
229	/**\r
230	Read BufferSize bytes from the current locaiton in the file. For load file\r
231	and FV case you must read the entire file. \r
232	\r
233	@param Stream Open File Handle\r
234	@param Buffer Caller allocated buffer. \r
235	@param BufferSize Size of buffer in bytes.\r
236	\r
237	\r
238	@return EFI_SUCCESS Stream is not an Open File\r
239	@return EFI_END_OF_FILE Tried to read past the end of the file\r
240	@return EFI_INVALID_PARAMETER Stream is not an open file handle\r
241	@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read\r
242	@return "other" Error returned from device read\r
243	\r
244	**/\r
245	EFI_STATUS\r
246	EfiRead (\r
247	IN EFI_OPEN_FILE *Stream,\r
248	OUT VOID *Buffer,\r
249	OUT UINTN *BufferSize\r
250	);\r
251	\r
252	\r
253	/**\r
254	Read the entire file into a buffer. This routine allocates the buffer and\r
255	returns it to the user full of the read data. \r
256	\r
257	This is very useful for load flie where it's hard to know how big the buffer\r
258	must be.\r
259	\r
260	@param Stream Open File Handle\r
261	@param Buffer Pointer to buffer to return. \r
262	@param BufferSize Pointer to Size of buffer return..\r
263	\r
264	\r
265	@return EFI_SUCCESS Stream is not an Open File\r
266	@return EFI_END_OF_FILE Tried to read past the end of the file\r
267	@return EFI_INVALID_PARAMETER Stream is not an open file handle\r
268	@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read\r
269	@return "other" Error returned from device read\r
270	\r
271	**/\r
272	EFI_STATUS\r
273	EfiReadAllocatePool (\r
274	IN EFI_OPEN_FILE *Stream,\r
275	OUT VOID **Buffer,\r
276	OUT UINTN *BufferSize\r
277	);\r
278	\r
279	\r
280	/**\r
281	Write data back to the file. \r
282	\r
283	@param Stream Open File Handle\r
284	@param Buffer Pointer to buffer to return. \r
285	@param BufferSize Pointer to Size of buffer return..\r
286	\r
287	\r
288	@return EFI_SUCCESS Stream is not an Open File\r
289	@return EFI_END_OF_FILE Tried to read past the end of the file\r
290	@return EFI_INVALID_PARAMETER Stream is not an open file handle\r
291	@return EFI_BUFFER_TOO_SMALL Buffer is not big enough to do the read\r
292	@return "other" Error returned from device write\r
293	\r
294	**/\r
295	EFI_STATUS\r
296	EfiWrite (\r
297	IN EFI_OPEN_FILE *Stream,\r
298	OUT VOID *Buffer,\r
299	OUT UINTN *BufferSize\r
300	);\r
301	\r
302	\r
303	/**\r
304	Return the number of devices of the current type active in the system\r
305	\r
306	@param Type Device type to check\r
307	\r
308	@return 0 Invalid type\r
309	\r
310	**/\r
311	UINTN\r
312	EfiGetDeviceCounts (\r
313	IN EFI_OPEN_FILE_TYPE Type\r
314	);\r
85e385f4	315	\r
	316	\r
	317	/**\r
	318	Set the Curent Working Directory (CWD). If a call is made to EfiOpen () and \r
	319	the path does not contain a device name, The CWD is prepended to the path.\r
	320	\r
	321	@param Cwd Current Working Directory to set\r
	322	\r
	323	\r
	324	@return EFI_SUCCESS CWD is set\r
	325	@return EFI_INVALID_PARAMETER Cwd is not a valid device:path\r
	326	\r
	327	**/\r
	328	EFI_STATUS\r
	329	EfiSetCwd (\r
	330	IN CHAR8 *Cwd\r
	331	); \r
	332	\r
	333	/**\r
	334	Set the Curent Working Directory (CWD). If a call is made to EfiOpen () and \r
	335	the path does not contain a device name, The CWD is prepended to the path.\r
	336	\r
	337	@param Cwd Current Working Directory \r
	338	\r
	339	\r
	340	@return NULL No CWD set\r
	341	@return 'other' malloc'ed buffer contains CWD.\r
	342	\r
	343	**/\r
	344	CHAR8 *\r
16ccac42	345	EfiGetCwd (\r
85e385f4	346	VOID\r
85e385f4	347	); \r
2ef2b01e A	348	\r
2ef2b01e A	349	#endif\r