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Rev | Author | Line No. | Line |
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2726 | vana | 1 | /*++ |
2 | |||
3 | Copyright (c) 1998 Intel Corporation |
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4 | |||
5 | Module Name: |
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6 | |||
7 | crc.c |
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8 | |||
9 | Abstract: |
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10 | |||
11 | CRC32 functions |
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12 | |||
13 | |||
14 | |||
15 | Revision History |
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16 | |||
17 | --*/ |
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18 | |||
19 | #include "lib.h" |
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20 | |||
21 | |||
22 | UINT32 CRCTable[256] = { |
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23 | 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, |
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24 | 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, |
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25 | 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, |
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26 | 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, |
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27 | 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, |
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28 | 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, |
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29 | 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, |
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30 | 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, |
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31 | 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, |
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32 | 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, |
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33 | 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, |
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34 | 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, |
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35 | 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, |
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36 | 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, |
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37 | 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, |
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38 | 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, |
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39 | 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, |
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40 | 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, |
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41 | 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, |
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42 | 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, |
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43 | 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, |
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44 | 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, |
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45 | 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, |
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46 | 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, |
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47 | 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, |
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48 | 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, |
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49 | 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, |
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50 | 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, |
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51 | 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, |
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52 | 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, |
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53 | 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, |
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54 | 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, |
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55 | 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, |
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56 | 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, |
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57 | 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, |
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58 | 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, |
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59 | 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, |
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60 | 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, |
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61 | 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, |
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62 | 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, |
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63 | 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, |
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64 | 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, |
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65 | 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D |
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66 | }; |
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67 | |||
68 | |||
69 | |||
70 | VOID |
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71 | SetCrc ( |
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72 | IN OUT EFI_TABLE_HEADER *Hdr |
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73 | ) |
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74 | /*++ |
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75 | |||
76 | Routine Description: |
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77 | |||
78 | Updates the CRC32 value in the table header |
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79 | |||
80 | Arguments: |
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81 | |||
82 | Hdr - The table to update |
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83 | |||
84 | Returns: |
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85 | |||
86 | None |
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87 | |||
88 | --*/ |
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89 | { |
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90 | SetCrcAltSize (Hdr->HeaderSize, Hdr); |
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91 | } |
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92 | |||
93 | VOID |
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94 | SetCrcAltSize ( |
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95 | IN UINTN Size, |
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96 | IN OUT EFI_TABLE_HEADER *Hdr |
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97 | ) |
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98 | /*++ |
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99 | |||
100 | Routine Description: |
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101 | |||
102 | Updates the CRC32 value in the table header |
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103 | |||
104 | Arguments: |
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105 | |||
106 | Hdr - The table to update |
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107 | |||
108 | Returns: |
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109 | |||
110 | None |
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111 | |||
112 | --*/ |
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113 | { |
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114 | Hdr->CRC32 = 0; |
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115 | Hdr->CRC32 = CalculateCrc((UINT8 *)Hdr, Size); |
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116 | } |
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117 | |||
118 | |||
119 | BOOLEAN |
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120 | CheckCrc ( |
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121 | IN UINTN MaxSize, |
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122 | IN OUT EFI_TABLE_HEADER *Hdr |
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123 | ) |
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124 | /*++ |
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125 | |||
126 | Routine Description: |
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127 | |||
128 | Checks the CRC32 value in the table header |
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129 | |||
130 | Arguments: |
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131 | |||
132 | Hdr - The table to check |
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133 | |||
134 | Returns: |
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135 | |||
136 | TRUE if the CRC is OK in the table |
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137 | |||
138 | --*/ |
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139 | { |
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140 | return CheckCrcAltSize (MaxSize, Hdr->HeaderSize, Hdr); |
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141 | } |
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142 | |||
143 | |||
144 | |||
145 | |||
146 | BOOLEAN |
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147 | CheckCrcAltSize ( |
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148 | IN UINTN MaxSize, |
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149 | IN UINTN Size, |
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150 | IN OUT EFI_TABLE_HEADER *Hdr |
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151 | ) |
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152 | /*++ |
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153 | |||
154 | Routine Description: |
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155 | |||
156 | Checks the CRC32 value in the table header |
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157 | |||
158 | Arguments: |
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159 | |||
160 | Hdr - The table to check |
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161 | |||
162 | Returns: |
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163 | |||
164 | TRUE if the CRC is OK in the table |
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165 | |||
166 | --*/ |
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167 | { |
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168 | UINT32 Crc; |
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169 | UINT32 OrgCrc; |
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170 | BOOLEAN f; |
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171 | |||
172 | if (Size == 0) { |
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173 | // |
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174 | // If header size is 0 CRC will pass so return FALSE here |
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175 | // |
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176 | return FALSE; |
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177 | } |
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178 | if (MaxSize && Size > MaxSize) { |
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179 | DEBUG((D_ERROR, "CheckCrc32: Size > MaxSize\n")); |
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180 | return FALSE; |
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181 | } |
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182 | |||
183 | // clear old crc from header |
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184 | OrgCrc = Hdr->CRC32; |
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185 | Hdr->CRC32 = 0; |
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186 | Crc = CalculateCrc((UINT8 *)Hdr, Size); |
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187 | |||
188 | // set restults |
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189 | Hdr->CRC32 = OrgCrc; |
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190 | |||
191 | // return status |
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192 | f = OrgCrc == (UINT32) Crc; |
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193 | if (!f) { |
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194 | DEBUG((D_ERROR, "CheckCrc32: Crc check failed\n")); |
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195 | } |
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196 | |||
197 | return f; |
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198 | } |
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199 | |||
200 | |||
201 | UINT32 |
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202 | CalculateCrc ( |
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203 | UINT8 *pt, |
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204 | UINTN Size |
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205 | ) |
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206 | { |
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207 | UINTN Crc; |
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208 | |||
209 | // compute crc |
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210 | Crc = 0xffffffff; |
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211 | while (Size) { |
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212 | Crc = (Crc >> 8) ^ CRCTable[(UINT8) Crc ^ *pt]; |
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213 | pt += 1; |
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214 | Size -= 1; |
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215 | } |
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216 | Crc = Crc ^ 0xffffffff; |
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217 | return (UINT32)Crc; |
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218 | } |