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1 | /** @file\r |
2 | Provides interface to EFI_FILE_HANDLE functionality.\r |
3 | \r |
1e6e84c7 |
4 | Copyright (c) 2009-2010, Intel Corporation. All rights reserved.<BR>\r |
5 | This program and the accompanying materials\r |
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6 | are licensed and made available under the terms and conditions of the BSD License\r |
7 | which accompanies this distribution. The full text of the license may be found at\r |
8 | http://opensource.org/licenses/bsd-license.php\r |
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9 | \r |
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10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
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12 | \r |
13 | **/\r |
14 | \r |
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15 | #if !defined (_FILE_HANDLE_LIBRARY_HEADER_)\r |
16 | #define _FILE_HANDLE_LIBRARY_HEADER_\r |
17 | \r |
18 | /// Tag for use in identifying UNICODE files.\r |
19 | /// If the file is UNICODE the first 16 bits of the file will equal this value.\r |
20 | enum {\r |
21 | UnicodeFileTag = 0xFEFF\r |
22 | };\r |
23 | \r |
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24 | /**\r |
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25 | This function will retrieve the information about the file for the handle\r |
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26 | specified and store it in allocated pool memory.\r |
27 | \r |
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28 | This function allocates a buffer to store the file's information. It is the\r |
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29 | caller's responsibility to free the buffer.\r |
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30 | \r |
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31 | @param FileHandle The file handle of the file for which information is\r |
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32 | being requested.\r |
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33 | \r |
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34 | @retval NULL information could not be retrieved.\r |
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35 | \r |
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36 | @retval !NULL the information about the file\r |
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37 | **/\r |
38 | EFI_FILE_INFO*\r |
39 | EFIAPI\r |
40 | FileHandleGetInfo (\r |
41 | IN EFI_FILE_HANDLE FileHandle\r |
42 | );\r |
43 | \r |
44 | /**\r |
1e6e84c7 |
45 | This function will set the information about the file for the opened handle\r |
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46 | specified.\r |
47 | \r |
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48 | @param FileHandle The file handle of the file for which information\r |
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49 | is being set.\r |
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50 | \r |
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51 | @param FileInfo The information to set.\r |
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52 | \r |
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53 | @retval EFI_SUCCESS The information was set.\r |
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54 | @retval EFI_INVALID_PARAMETER A Parameter was out of range or invalid.\r |
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55 | @retval EFI_UNSUPPORTED The FileHandle does not support FileInfo.\r |
56 | @retval EFI_NO_MEDIA The device has no medium.\r |
57 | @retval EFI_DEVICE_ERROR The device reported an error.\r |
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58 | @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.\r |
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59 | @retval EFI_WRITE_PROTECTED The file or medium is write protected.\r |
60 | @retval EFI_ACCESS_DENIED The file was opened read only.\r |
61 | @retval EFI_VOLUME_FULL The volume is full.\r |
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62 | **/\r |
63 | EFI_STATUS\r |
64 | EFIAPI\r |
65 | FileHandleSetInfo (\r |
66 | IN EFI_FILE_HANDLE FileHandle,\r |
67 | IN CONST EFI_FILE_INFO *FileInfo\r |
68 | );\r |
69 | \r |
70 | /**\r |
71 | This function reads information from an opened file.\r |
72 | \r |
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73 | If FileHandle is not a directory, the function reads the requested number of\r |
74 | bytes from the file at the file's current position and returns them in Buffer.\r |
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75 | If the read goes beyond the end of the file, the read length is truncated to the\r |
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76 | end of the file. The file's current position is increased by the number of bytes\r |
77 | returned. If FileHandle is a directory, the function reads the directory entry\r |
78 | at the file's current position and returns the entry in Buffer. If the Buffer\r |
79 | is not large enough to hold the current directory entry, then\r |
80 | EFI_BUFFER_TOO_SMALL is returned and the current file position is not updated.\r |
81 | BufferSize is set to be the size of the buffer needed to read the entry. On\r |
82 | success, the current position is updated to the next directory entry. If there\r |
83 | are no more directory entries, the read returns a zero-length buffer.\r |
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84 | EFI_FILE_INFO is the structure returned as the directory entry.\r |
85 | \r |
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86 | @param FileHandle The opened file handle.\r |
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87 | @param BufferSize On input the size of buffer in bytes. On return\r |
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88 | the number of bytes written.\r |
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89 | @param Buffer The buffer to put read data into.\r |
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90 | \r |
91 | @retval EFI_SUCCESS Data was read.\r |
92 | @retval EFI_NO_MEDIA The device has no media.\r |
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93 | @retval EFI_DEVICE_ERROR The device reported an error.\r |
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94 | @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.\r |
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95 | @retval EFI_BUFFER_TO_SMALL Buffer is too small. ReadSize contains required\r |
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96 | size.\r |
97 | \r |
98 | **/\r |
99 | EFI_STATUS\r |
100 | EFIAPI\r |
101 | FileHandleRead(\r |
102 | IN EFI_FILE_HANDLE FileHandle,\r |
103 | IN OUT UINTN *BufferSize,\r |
104 | OUT VOID *Buffer\r |
105 | );\r |
106 | \r |
107 | /**\r |
108 | Write data to a file.\r |
109 | \r |
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110 | This function writes the specified number of bytes to the file at the current\r |
111 | file position. The current file position is advanced the actual number of bytes\r |
112 | written, which is returned in BufferSize. Partial writes only occur when there\r |
113 | has been a data error during the write attempt (such as "volume space full").\r |
114 | The file is automatically grown to hold the data if required. Direct writes to\r |
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115 | opened directories are not supported.\r |
116 | \r |
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117 | @param FileHandle The opened file for writing\r |
118 | @param BufferSize On input the number of bytes in Buffer. On output\r |
119 | the number of bytes written.\r |
120 | @param Buffer The buffer containing data to write is stored.\r |
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121 | \r |
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122 | @retval EFI_SUCCESS Data was written.\r |
123 | @retval EFI_UNSUPPORTED Writes to an open directory are not supported.\r |
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124 | @retval EFI_NO_MEDIA The device has no media.\r |
125 | @retval EFI_DEVICE_ERROR The device reported an error.\r |
126 | @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.\r |
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127 | @retval EFI_WRITE_PROTECTED The device is write-protected.\r |
128 | @retval EFI_ACCESS_DENIED The file was open for read only.\r |
129 | @retval EFI_VOLUME_FULL The volume is full.\r |
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130 | **/\r |
131 | EFI_STATUS\r |
132 | EFIAPI\r |
133 | FileHandleWrite(\r |
134 | IN EFI_FILE_HANDLE FileHandle,\r |
135 | IN OUT UINTN *BufferSize,\r |
136 | IN VOID *Buffer\r |
137 | );\r |
138 | \r |
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139 | /**\r |
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140 | Close an open file handle.\r |
141 | \r |
1e6e84c7 |
142 | This function closes a specified file handle. All "dirty" cached file data is\r |
143 | flushed to the device, and the file is closed. In all cases the handle is\r |
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144 | closed.\r |
145 | \r |
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146 | @param FileHandle The file handle to close.\r |
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147 | \r |
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148 | @retval EFI_SUCCESS The file handle was closed sucessfully.\r |
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149 | **/\r |
150 | EFI_STATUS\r |
151 | EFIAPI\r |
152 | FileHandleClose (\r |
153 | IN EFI_FILE_HANDLE FileHandle\r |
154 | );\r |
155 | \r |
156 | /**\r |
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157 | Delete a file and close the handle.\r |
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158 | \r |
159 | This function closes and deletes a file. In all cases the file handle is closed.\r |
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160 | If the file cannot be deleted, the warning code EFI_WARN_DELETE_FAILURE is\r |
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161 | returned, but the handle is still closed.\r |
162 | \r |
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163 | @param FileHandle The file handle to delete.\r |
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164 | \r |
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165 | @retval EFI_SUCCESS The file was closed sucessfully.\r |
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166 | @retval EFI_WARN_DELETE_FAILURE the handle was closed, but the file was not\r |
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167 | deleted\r |
168 | @retval INVALID_PARAMETER One of the parameters has an invalid value.\r |
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169 | **/\r |
170 | EFI_STATUS\r |
171 | EFIAPI\r |
172 | FileHandleDelete (\r |
173 | IN EFI_FILE_HANDLE FileHandle\r |
174 | );\r |
175 | \r |
176 | /**\r |
177 | Set the current position in a file.\r |
178 | \r |
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179 | This function sets the current file position for the handle to the position\r |
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180 | supplied. With the exception of seeking to position 0xFFFFFFFFFFFFFFFF, only\r |
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181 | absolute positioning is supported, and seeking past the end of the file is\r |
182 | allowed (a subsequent write would grow the file). Seeking to position\r |
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183 | 0xFFFFFFFFFFFFFFFF causes the current position to be set to the end of the file.\r |
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184 | If FileHandle is a directory, the only position that may be set is zero. This\r |
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185 | has the effect of starting the read process of the directory entries over.\r |
186 | \r |
187 | @param FileHandle The file handle on which the position is being set\r |
188 | @param Position Byte position from begining of file\r |
189 | \r |
190 | @retval EFI_SUCCESS Operation completed sucessfully.\r |
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191 | @retval EFI_UNSUPPORTED the seek request for non-zero is not valid on\r |
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192 | directories.\r |
193 | @retval INVALID_PARAMETER One of the parameters has an invalid value.\r |
194 | **/\r |
195 | EFI_STATUS\r |
196 | EFIAPI\r |
197 | FileHandleSetPosition (\r |
198 | IN EFI_FILE_HANDLE FileHandle,\r |
199 | IN UINT64 Position\r |
200 | );\r |
201 | \r |
1e6e84c7 |
202 | /**\r |
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203 | Gets a file's current position.\r |
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204 | \r |
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205 | This function retrieves the current file position for the file handle. For\r |
206 | directories, the current file position has no meaning outside of the file\r |
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207 | system driver and as such the operation is not supported. An error is returned\r |
208 | if FileHandle is a directory.\r |
209 | \r |
210 | @param FileHandle The open file handle on which to get the position.\r |
211 | @param Position Byte position from begining of file.\r |
212 | \r |
213 | @retval EFI_SUCCESS the operation completed sucessfully.\r |
214 | @retval INVALID_PARAMETER One of the parameters has an invalid value.\r |
215 | @retval EFI_UNSUPPORTED the request is not valid on directories.\r |
216 | **/\r |
217 | EFI_STATUS\r |
218 | EFIAPI\r |
219 | FileHandleGetPosition (\r |
220 | IN EFI_FILE_HANDLE FileHandle,\r |
221 | OUT UINT64 *Position\r |
222 | );\r |
223 | /**\r |
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224 | Flushes data on a file.\r |
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225 | \r |
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226 | This function flushes all modified data associated with a file to a device.\r |
227 | \r |
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228 | @param FileHandle The file handle on which to flush data.\r |
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229 | \r |
230 | @retval EFI_SUCCESS The data was flushed.\r |
231 | @retval EFI_NO_MEDIA The device has no media.\r |
232 | @retval EFI_DEVICE_ERROR The device reported an error.\r |
233 | @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.\r |
234 | @retval EFI_WRITE_PROTECTED The file or medium is write protected.\r |
235 | @retval EFI_ACCESS_DENIED The file was opened for read only.\r |
236 | **/\r |
237 | EFI_STATUS\r |
238 | EFIAPI\r |
239 | FileHandleFlush (\r |
240 | IN EFI_FILE_HANDLE FileHandle\r |
241 | );\r |
242 | \r |
243 | /**\r |
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244 | Function to determine if a given handle is a directory handle.\r |
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245 | \r |
125c2cf4 |
246 | If DirHandle is NULL then ASSERT().\r |
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247 | \r |
125c2cf4 |
248 | Open the file information on the DirHandle and verify that the Attribute\r |
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249 | includes EFI_FILE_DIRECTORY bit set.\r |
250 | \r |
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251 | @param DirHandle Handle to open file.\r |
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252 | \r |
253 | @retval EFI_SUCCESS DirHandle is a directory\r |
254 | @retval EFI_INVALID_PARAMETER DirHandle did not have EFI_FILE_INFO available\r |
255 | @retval EFI_NOT_FOUND DirHandle is not a directory\r |
256 | **/\r |
257 | EFI_STATUS\r |
258 | EFIAPI\r |
259 | FileHandleIsDirectory (\r |
260 | IN EFI_FILE_HANDLE DirHandle\r |
261 | );\r |
262 | \r |
263 | /**\r |
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264 | Retrieves the first file from a directory.\r |
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265 | \r |
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266 | This function opens a directory and gets the first file's info in the\r |
267 | directory. Caller can use FileHandleFindNextFile() to get other files. When\r |
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268 | complete the caller is responsible for calling FreePool() on *Buffer.\r |
269 | \r |
270 | @param DirHandle The file handle of the directory to search\r |
271 | @param Buffer Pointer to pointer to buffer for file's information\r |
272 | \r |
273 | @retval EFI_SUCCESS Found the first file.\r |
274 | @retval EFI_NOT_FOUND Cannot find the directory.\r |
275 | @retval EFI_NO_MEDIA The device has no media.\r |
276 | @retval EFI_DEVICE_ERROR The device reported an error.\r |
277 | @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.\r |
278 | @return Others status of FileHandleGetInfo, FileHandleSetPosition,\r |
279 | or FileHandleRead\r |
280 | **/\r |
281 | EFI_STATUS\r |
282 | EFIAPI\r |
283 | FileHandleFindFirstFile (\r |
284 | IN EFI_FILE_HANDLE DirHandle,\r |
285 | OUT EFI_FILE_INFO **Buffer\r |
286 | );\r |
287 | /**\r |
288 | Retrieves the next file in a directory.\r |
289 | \r |
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290 | To use this function, caller must call the FileHandleFindFirstFile() to get the\r |
291 | first file, and then use this function get other files. This function can be\r |
292 | called for several times to get each file's information in the directory. If\r |
293 | the call of FileHandleFindNextFile() got the last file in the directory, the next\r |
294 | call of this function has no file to get. *NoFile will be set to TRUE and the\r |
295 | Buffer memory will be automatically freed.\r |
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296 | \r |
297 | @param DirHandle the file handle of the directory\r |
298 | @param Buffer pointer to buffer for file's information\r |
299 | @param NoFile pointer to boolean when last file is found\r |
300 | \r |
301 | @retval EFI_SUCCESS Found the next file, or reached last file\r |
302 | @retval EFI_NO_MEDIA The device has no media.\r |
303 | @retval EFI_DEVICE_ERROR The device reported an error.\r |
304 | @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.\r |
305 | **/\r |
306 | EFI_STATUS\r |
307 | EFIAPI\r |
308 | FileHandleFindNextFile(\r |
309 | IN EFI_FILE_HANDLE DirHandle,\r |
310 | OUT EFI_FILE_INFO *Buffer,\r |
311 | OUT BOOLEAN *NoFile\r |
312 | );\r |
313 | \r |
314 | /**\r |
315 | Retrieve the size of a file.\r |
316 | \r |
125c2cf4 |
317 | If FileHandle is NULL then ASSERT()\r |
318 | If Size is NULL then ASSERT()\r |
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319 | \r |
1e6e84c7 |
320 | This function extracts the file size info from the FileHandle's EFI_FILE_INFO\r |
d2b4564b |
321 | data.\r |
322 | \r |
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323 | @param FileHandle The file handle from which size is retrieved.\r |
324 | @param Size pointer to size.\r |
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325 | \r |
326 | @retval EFI_SUCCESS operation was completed sucessfully\r |
327 | @retval EFI_DEVICE_ERROR cannot access the file\r |
328 | **/\r |
329 | EFI_STATUS\r |
330 | EFIAPI\r |
331 | FileHandleGetSize (\r |
332 | IN EFI_FILE_HANDLE FileHandle,\r |
333 | OUT UINT64 *Size\r |
b1f95a06 |
334 | );\r |
335 | \r |
336 | /**\r |
1e6e84c7 |
337 | Function to get a full filename given a EFI_FILE_HANDLE somewhere lower on the\r |
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338 | directory 'stack'.\r |
339 | \r |
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340 | @param[in] Handle Handle to the Directory or File to create path to.\r |
1e6e84c7 |
341 | @param[out] FullFileName Pointer to pointer to generated full file name. It\r |
b1f95a06 |
342 | is the responsibility of the caller to free this memory\r |
343 | with a call to FreePool().\r |
344 | @retval EFI_SUCCESS the operation was sucessful and the FullFileName is valid.\r |
345 | @retval EFI_INVALID_PARAMETER Handle was NULL.\r |
346 | @retval EFI_INVALID_PARAMETER FullFileName was NULL.\r |
347 | @retval EFI_OUT_OF_MEMORY a memory allocation failed.\r |
348 | **/\r |
349 | EFI_STATUS\r |
350 | EFIAPI\r |
351 | FileHandleGetFileName (\r |
352 | IN CONST EFI_FILE_HANDLE Handle,\r |
353 | OUT CHAR16 **FullFileName\r |
354 | );\r |
355 | \r |
356 | /**\r |
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357 | Function to read a single line (up to but not including the \n) from a file.\r |
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358 | \r |
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359 | If the position upon start is 0, then the Ascii Boolean will be set. This should be\r |
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360 | maintained and not changed for all operations with the same file.\r |
361 | \r |
362 | @param[in] Handle FileHandle to read from\r |
363 | @param[in,out] Buffer pointer to buffer to read into\r |
364 | @param[in,out] Size pointer to number of bytes in buffer\r |
365 | @param[in] Truncate if TRUE then allows for truncation of the line to fit.\r |
1e6e84c7 |
366 | if FALSE will reset the position to the begining of the\r |
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367 | line if the buffer is not large enough.\r |
1e6e84c7 |
368 | @param[in,out] Ascii Boolean value for indicating whether the file is\r |
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369 | Ascii (TRUE) or UCS2 (FALSE);\r |
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370 | \r |
1e6e84c7 |
371 | @retval EFI_SUCCESS the operation was sucessful. the line is stored in\r |
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372 | Buffer.\r |
b1f95a06 |
373 | @retval EFI_INVALID_PARAMETER Handle was NULL.\r |
b1f95a06 |
374 | @retval EFI_INVALID_PARAMETER Size was NULL.\r |
1e6e84c7 |
375 | @retval EFI_BUFFER_TOO_SMALL Size was not enough space to store the line.\r |
b1f95a06 |
376 | Size was updated to minimum space required.\r |
377 | @sa FileHandleRead\r |
378 | **/\r |
379 | EFI_STATUS\r |
380 | EFIAPI\r |
381 | FileHandleReadLine(\r |
382 | IN EFI_FILE_HANDLE Handle,\r |
125c2cf4 |
383 | IN OUT CHAR16 *Buffer,\r |
b1f95a06 |
384 | IN OUT UINTN *Size,\r |
b3011f40 |
385 | IN BOOLEAN Truncate,\r |
386 | IN OUT BOOLEAN *Ascii\r |
387 | );\r |
388 | \r |
389 | /**\r |
1e6e84c7 |
390 | Function to read a single line from a file. The \n is not included in the returned\r |
b3011f40 |
391 | buffer. The returned buffer must be callee freed.\r |
392 | \r |
1e6e84c7 |
393 | If the position upon start is 0, then the Ascii Boolean will be set. This should be\r |
b3011f40 |
394 | maintained and not changed for all operations with the same file.\r |
395 | \r |
396 | @param[in] Handle FileHandle to read from.\r |
397 | @param[in,out] Ascii Boolean value for indicating whether the file is Ascii (TRUE) or UCS2 (FALSE);\r |
398 | \r |
399 | @return The line of text from the file.\r |
400 | \r |
401 | @sa FileHandleReadLine\r |
402 | **/\r |
403 | CHAR16*\r |
404 | EFIAPI\r |
405 | FileHandleReturnLine(\r |
406 | IN EFI_FILE_HANDLE Handle,\r |
407 | IN OUT BOOLEAN *Ascii\r |
b1f95a06 |
408 | );\r |
409 | \r |
410 | /**\r |
125c2cf4 |
411 | Function to write a line of unicode text to a file.\r |
b1f95a06 |
412 | \r |
125c2cf4 |
413 | If Handle is NULL, ASSERT.\r |
b1f95a06 |
414 | \r |
415 | @param[in] Handle FileHandle to write to\r |
1e6e84c7 |
416 | @param[in] Buffer Buffer to write, if NULL the function will\r |
125c2cf4 |
417 | take no action and return EFI_SUCCESS.\r |
b1f95a06 |
418 | \r |
419 | @retval EFI_SUCCESS the data was written.\r |
420 | @retval other failure.\r |
421 | \r |
422 | @sa FileHandleWrite\r |
423 | **/\r |
424 | EFI_STATUS\r |
425 | EFIAPI\r |
426 | FileHandleWriteLine(\r |
427 | IN EFI_FILE_HANDLE Handle,\r |
428 | IN CHAR16 *Buffer\r |
e9880e25 |
429 | );\r |
125c2cf4 |
430 | \r |
431 | /**\r |
432 | function to take a formatted argument and print it to a file.\r |
433 | \r |
434 | @param[in] Handle the file handle for the file to write to\r |
435 | @param[in] Format the format argument (see printlib for format specifier)\r |
436 | @param[in] ... the variable arguments for the format\r |
437 | \r |
438 | @retval EFI_SUCCESS the operation was sucessful\r |
439 | @return other a return value from FileHandleWriteLine\r |
440 | \r |
441 | @sa FileHandleWriteLine\r |
442 | **/\r |
443 | EFI_STATUS\r |
444 | EFIAPI\r |
445 | FileHandlePrintLine(\r |
446 | IN EFI_FILE_HANDLE Handle,\r |
447 | IN CONST CHAR16 *Format,\r |
448 | ...\r |
449 | );\r |
450 | \r |
451 | /**\r |
452 | Function to determine if a FILE_HANDLE is at the end of the file.\r |
453 | \r |
454 | This will NOT work on directories.\r |
455 | \r |
b3011f40 |
456 | If Handle is NULL, then ASSERT.\r |
457 | \r |
125c2cf4 |
458 | @param[in] Handle the file handle\r |
459 | \r |
460 | @retval TRUE the position is at the end of the file\r |
461 | @retval FALSE the position is not at the end of the file\r |
462 | **/\r |
463 | BOOLEAN\r |
464 | EFIAPI\r |
465 | FileHandleEof(\r |
466 | IN EFI_FILE_HANDLE Handle\r |
467 | );\r |
b3011f40 |
468 | \r |
469 | #endif //_FILE_HANDLE_LIBRARY_HEADER_\r |
470 | \r |