projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 20752cb8 HW |
1 | /** @file\r |
| 2 | Internal file explorer helper functions for RamDiskDxe driver.\r | |
| 3 | \r | |
| 4 | Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r | |
| 9d510e61 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 20752cb8 HW |
6 | \r |
| 7 | **/\r | |
| 8 | \r | |
| 9 | #include "RamDiskImpl.h"\r | |
| 10 | \r | |
| 11 | \r | |
| 12 | /**\r | |
| 13 | Helper function called as part of the code needed to allocate the proper\r | |
| 14 | sized buffer for various EFI interfaces.\r | |
| 15 | \r | |
| 16 | @param[in, out] Status Current status.\r | |
| 17 | @param[in, out] Buffer Current allocated buffer, or NULL.\r | |
| 18 | @param[in] BufferSize Current buffer size needed.\r | |
| 19 | \r | |
| 20 | @retval TRUE If the buffer was reallocated and the caller should\r | |
| 21 | try the API again.\r | |
| 22 | @retval FALSE The caller should not call this function again.\r | |
| 23 | \r | |
| 24 | **/\r | |
| 25 | BOOLEAN\r | |
| 26 | GrowBuffer (\r | |
| 27 | IN OUT EFI_STATUS *Status,\r | |
| 28 | IN OUT VOID **Buffer,\r | |
| 29 | IN UINTN BufferSize\r | |
| 30 | )\r | |
| 31 | {\r | |
| 32 | BOOLEAN TryAgain;\r | |
| 33 | \r | |
| 34 | //\r | |
| 35 | // If this is an initial request, buffer will be null with a new buffer size\r | |
| 36 | //\r | |
| 37 | if ((*Buffer == NULL) && (BufferSize != 0)) {\r | |
| 38 | *Status = EFI_BUFFER_TOO_SMALL;\r | |
| 39 | }\r | |
| 40 | //\r | |
| 41 | // If the status code is "buffer too small", resize the buffer\r | |
| 42 | //\r | |
| 43 | TryAgain = FALSE;\r | |
| 44 | if (*Status == EFI_BUFFER_TOO_SMALL) {\r | |
| 45 | \r | |
| 46 | if (*Buffer != NULL) {\r | |
| 47 | FreePool (*Buffer);\r | |
| 48 | }\r | |
| 49 | \r | |
| 50 | *Buffer = AllocateZeroPool (BufferSize);\r | |
| 51 | \r | |
| 52 | if (*Buffer != NULL) {\r | |
| 53 | TryAgain = TRUE;\r | |
| 54 | } else {\r | |
| 55 | *Status = EFI_OUT_OF_RESOURCES;\r | |
| 56 | }\r | |
| 57 | }\r | |
| 58 | //\r | |
| 59 | // If there's an error, free the buffer\r | |
| 60 | //\r | |
| 61 | if (!TryAgain && EFI_ERROR (*Status) && (*Buffer != NULL)) {\r | |
| 62 | FreePool (*Buffer);\r | |
| 63 | *Buffer = NULL;\r | |
| 64 | }\r | |
| 65 | \r | |
| 66 | return TryAgain;\r | |
| 67 | }\r | |
| 68 | \r | |
| 69 | \r | |
| 70 | /**\r | |
| 71 | This function gets the file information from an open file descriptor,\r | |
| 72 | and stores it in a buffer allocated from pool.\r | |
| 73 | \r | |
| 74 | @param[in] FHand File Handle.\r | |
| 75 | \r | |
| 76 | @return A pointer to a buffer with file information or NULL is returned.\r | |
| 77 | \r | |
| 78 | **/\r | |
| 79 | EFI_FILE_INFO *\r | |
| 80 | FileInfo (\r | |
| 81 | IN EFI_FILE_HANDLE FHand\r | |
| 82 | )\r | |
| 83 | {\r | |
| 84 | EFI_STATUS Status;\r | |
| 85 | EFI_FILE_INFO *Buffer;\r | |
| 86 | UINTN BufferSize;\r | |
| 87 | \r | |
| 88 | //\r | |
| 89 | // Initialize for GrowBuffer loop\r | |
| 90 | //\r | |
| 91 | Buffer = NULL;\r | |
| 92 | BufferSize = SIZE_OF_EFI_FILE_INFO + 200;\r | |
| 93 | \r | |
| 94 | //\r | |
| 95 | // Call the real function\r | |
| 96 | //\r | |
| 97 | while (GrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {\r | |
| 98 | Status = FHand->GetInfo (\r | |
| 99 | FHand,\r | |
| 100 | &gEfiFileInfoGuid,\r | |
| 101 | &BufferSize,\r | |
| 102 | Buffer\r | |
| 103 | );\r | |
| 104 | }\r | |
| 105 | \r | |
| 106 | return Buffer;\r | |
| 107 | }\r |