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23c98c94 | 1 | /** @file\r |
504214c4 LG |
2 | FFS file access utilities.\r |
3 | \r | |
deff65a4 | 4 | Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r |
cd5ebaa0 | 5 | This program and the accompanying materials\r |
23c98c94 | 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 | |
9 | \r | |
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 | |
28a00297 | 12 | \r |
504214c4 | 13 | **/\r |
28a00297 | 14 | \r |
15 | \r | |
9c4ac31c | 16 | #include "DxeMain.h"\r |
ec90508b | 17 | #include "FwVolDriver.h"\r |
28a00297 | 18 | \r |
28a00297 | 19 | \r |
162ed594 | 20 | /**\r |
21 | Get the FFS file state by checking the highest bit set in the header's state field.\r | |
22 | \r | |
022c6d45 | 23 | @param ErasePolarity Erase polarity attribute of the firmware volume\r |
24 | @param FfsHeader Points to the FFS file header\r | |
162ed594 | 25 | \r |
26 | @return FFS File state\r | |
27 | \r | |
28 | **/\r | |
28a00297 | 29 | EFI_FFS_FILE_STATE\r |
30 | GetFileState (\r | |
31 | IN UINT8 ErasePolarity,\r | |
32 | IN EFI_FFS_FILE_HEADER *FfsHeader\r | |
33 | )\r | |
28a00297 | 34 | {\r |
35 | EFI_FFS_FILE_STATE FileState;\r | |
36 | UINT8 HighestBit;\r | |
37 | \r | |
38 | FileState = FfsHeader->State;\r | |
39 | \r | |
40 | if (ErasePolarity != 0) {\r | |
41 | FileState = (EFI_FFS_FILE_STATE)~FileState;\r | |
42 | }\r | |
43 | \r | |
44 | HighestBit = 0x80;\r | |
45 | while (HighestBit != 0 && ((HighestBit & FileState) == 0)) {\r | |
46 | HighestBit >>= 1;\r | |
47 | }\r | |
48 | \r | |
e94a9ff7 | 49 | return (EFI_FFS_FILE_STATE) HighestBit;\r |
28a00297 | 50 | }\r |
51 | \r | |
52 | \r | |
162ed594 | 53 | \r |
54 | /**\r | |
55 | Check if a block of buffer is erased.\r | |
56 | \r | |
022c6d45 | 57 | @param ErasePolarity Erase polarity attribute of the firmware volume\r |
58 | @param InBuffer The buffer to be checked\r | |
59 | @param BufferSize Size of the buffer in bytes\r | |
162ed594 | 60 | \r |
022c6d45 | 61 | @retval TRUE The block of buffer is erased\r |
162ed594 | 62 | @retval FALSE The block of buffer is not erased\r |
63 | \r | |
64 | **/\r | |
28a00297 | 65 | BOOLEAN\r |
66 | IsBufferErased (\r | |
67 | IN UINT8 ErasePolarity,\r | |
68 | IN VOID *InBuffer,\r | |
69 | IN UINTN BufferSize\r | |
70 | )\r | |
28a00297 | 71 | {\r |
72 | UINTN Count;\r | |
73 | UINT8 EraseByte;\r | |
74 | UINT8 *Buffer;\r | |
75 | \r | |
76 | if(ErasePolarity == 1) {\r | |
77 | EraseByte = 0xFF;\r | |
78 | } else {\r | |
79 | EraseByte = 0;\r | |
80 | }\r | |
81 | \r | |
82 | Buffer = InBuffer;\r | |
83 | for (Count = 0; Count < BufferSize; Count++) {\r | |
84 | if (Buffer[Count] != EraseByte) {\r | |
85 | return FALSE;\r | |
86 | }\r | |
87 | }\r | |
88 | \r | |
89 | return TRUE;\r | |
90 | }\r | |
91 | \r | |
92 | \r | |
162ed594 | 93 | \r |
94 | /**\r | |
95 | Verify checksum of the firmware volume header.\r | |
96 | \r | |
022c6d45 | 97 | @param FvHeader Points to the firmware volume header to be checked\r |
162ed594 | 98 | \r |
022c6d45 | 99 | @retval TRUE Checksum verification passed\r |
162ed594 | 100 | @retval FALSE Checksum verification failed\r |
101 | \r | |
102 | **/\r | |
28a00297 | 103 | BOOLEAN\r |
104 | VerifyFvHeaderChecksum (\r | |
105 | IN EFI_FIRMWARE_VOLUME_HEADER *FvHeader\r | |
106 | )\r | |
28a00297 | 107 | {\r |
28a00297 | 108 | UINT16 Checksum;\r |
28a00297 | 109 | \r |
deff65a4 | 110 | Checksum = CalculateSum16 ((UINT16 *) FvHeader, FvHeader->HeaderLength);\r |
28a00297 | 111 | \r |
112 | if (Checksum == 0) {\r | |
113 | return TRUE;\r | |
114 | } else {\r | |
115 | return FALSE;\r | |
116 | }\r | |
117 | }\r | |
118 | \r | |
162ed594 | 119 | \r |
120 | /**\r | |
121 | Verify checksum of the FFS file header.\r | |
122 | \r | |
022c6d45 | 123 | @param FfsHeader Points to the FFS file header to be checked\r |
162ed594 | 124 | \r |
022c6d45 | 125 | @retval TRUE Checksum verification passed\r |
162ed594 | 126 | @retval FALSE Checksum verification failed\r |
127 | \r | |
128 | **/\r | |
28a00297 | 129 | BOOLEAN\r |
130 | VerifyHeaderChecksum (\r | |
131 | IN EFI_FFS_FILE_HEADER *FfsHeader\r | |
132 | )\r | |
28a00297 | 133 | {\r |
deff65a4 | 134 | UINT8 HeaderChecksum;\r |
28a00297 | 135 | \r |
6c85d162 SZ |
136 | if (IS_FFS_FILE2 (FfsHeader)) {\r |
137 | HeaderChecksum = CalculateSum8 ((UINT8 *) FfsHeader, sizeof (EFI_FFS_FILE_HEADER2));\r | |
138 | } else {\r | |
139 | HeaderChecksum = CalculateSum8 ((UINT8 *) FfsHeader, sizeof (EFI_FFS_FILE_HEADER));\r | |
140 | }\r | |
28a00297 | 141 | HeaderChecksum = (UINT8) (HeaderChecksum - FfsHeader->State - FfsHeader->IntegrityCheck.Checksum.File);\r |
142 | \r | |
143 | if (HeaderChecksum == 0) {\r | |
144 | return TRUE;\r | |
145 | } else {\r | |
146 | return FALSE;\r | |
147 | }\r | |
148 | }\r | |
149 | \r | |
150 | \r | |
162ed594 | 151 | \r |
152 | /**\r | |
153 | Check if it's a valid FFS file header.\r | |
154 | \r | |
022c6d45 | 155 | @param ErasePolarity Erase polarity attribute of the firmware volume\r |
156 | @param FfsHeader Points to the FFS file header to be checked\r | |
157 | @param FileState FFS file state to be returned\r | |
162ed594 | 158 | \r |
022c6d45 | 159 | @retval TRUE Valid FFS file header\r |
162ed594 | 160 | @retval FALSE Invalid FFS file header\r |
161 | \r | |
162 | **/\r | |
28a00297 | 163 | BOOLEAN\r |
164 | IsValidFfsHeader (\r | |
165 | IN UINT8 ErasePolarity,\r | |
166 | IN EFI_FFS_FILE_HEADER *FfsHeader,\r | |
167 | OUT EFI_FFS_FILE_STATE *FileState\r | |
168 | )\r | |
28a00297 | 169 | {\r |
170 | *FileState = GetFileState (ErasePolarity, FfsHeader);\r | |
171 | \r | |
172 | switch (*FileState) {\r | |
e94a9ff7 | 173 | case EFI_FILE_HEADER_VALID:\r |
174 | case EFI_FILE_DATA_VALID:\r | |
175 | case EFI_FILE_MARKED_FOR_UPDATE:\r | |
176 | case EFI_FILE_DELETED:\r | |
177 | //\r | |
178 | // Here we need to verify header checksum\r | |
179 | //\r | |
180 | return VerifyHeaderChecksum (FfsHeader);\r | |
022c6d45 | 181 | \r |
e94a9ff7 | 182 | case EFI_FILE_HEADER_CONSTRUCTION:\r |
183 | case EFI_FILE_HEADER_INVALID:\r | |
184 | default:\r | |
185 | return FALSE;\r | |
28a00297 | 186 | }\r |
187 | }\r | |
188 | \r | |
189 | \r | |
162ed594 | 190 | /**\r |
191 | Check if it's a valid FFS file.\r | |
192 | Here we are sure that it has a valid FFS file header since we must call IsValidFfsHeader() first.\r | |
193 | \r | |
022c6d45 | 194 | @param ErasePolarity Erase polarity attribute of the firmware volume\r |
195 | @param FfsHeader Points to the FFS file to be checked\r | |
162ed594 | 196 | \r |
022c6d45 | 197 | @retval TRUE Valid FFS file\r |
162ed594 | 198 | @retval FALSE Invalid FFS file\r |
199 | \r | |
200 | **/\r | |
28a00297 | 201 | BOOLEAN\r |
202 | IsValidFfsFile (\r | |
203 | IN UINT8 ErasePolarity,\r | |
204 | IN EFI_FFS_FILE_HEADER *FfsHeader\r | |
205 | )\r | |
28a00297 | 206 | {\r |
207 | EFI_FFS_FILE_STATE FileState;\r | |
89cd8129 | 208 | UINT8 DataCheckSum;\r |
28a00297 | 209 | \r |
210 | FileState = GetFileState (ErasePolarity, FfsHeader);\r | |
211 | switch (FileState) {\r | |
212 | \r | |
e94a9ff7 | 213 | case EFI_FILE_DELETED:\r |
214 | case EFI_FILE_DATA_VALID:\r | |
215 | case EFI_FILE_MARKED_FOR_UPDATE:\r | |
89cd8129 | 216 | DataCheckSum = FFS_FIXED_CHECKSUM;\r |
89cd8129 | 217 | if ((FfsHeader->Attributes & FFS_ATTRIB_CHECKSUM) == FFS_ATTRIB_CHECKSUM) {\r |
6c85d162 SZ |
218 | if (IS_FFS_FILE2 (FfsHeader)) {\r |
219 | DataCheckSum = CalculateCheckSum8 ((CONST UINT8 *) FfsHeader + sizeof (EFI_FFS_FILE_HEADER2), FFS_FILE2_SIZE (FfsHeader) - sizeof(EFI_FFS_FILE_HEADER2));\r | |
220 | } else {\r | |
221 | DataCheckSum = CalculateCheckSum8 ((CONST UINT8 *) FfsHeader + sizeof (EFI_FFS_FILE_HEADER), FFS_FILE_SIZE (FfsHeader) - sizeof(EFI_FFS_FILE_HEADER));\r | |
222 | }\r | |
89cd8129 LG |
223 | }\r |
224 | if (FfsHeader->IntegrityCheck.Checksum.File == DataCheckSum) {\r | |
225 | return TRUE;\r | |
226 | }\r | |
28a00297 | 227 | \r |
e94a9ff7 | 228 | default:\r |
229 | return FALSE;\r | |
28a00297 | 230 | }\r |
231 | }\r | |
232 | \r | |
162ed594 | 233 | \r |