xref: /netbsd-src/sys/external/bsd/gnu-efi/dist/lib/crc.c (revision b2c829d73acfa2ef1ac1967460ebcec8f439b096)
1*b2c829d7Sjakllsch /*	$NetBSD: crc.c,v 1.1.1.1 2014/04/01 16:16:06 jakllsch Exp $	*/
2*b2c829d7Sjakllsch 
3*b2c829d7Sjakllsch /*++
4*b2c829d7Sjakllsch 
5*b2c829d7Sjakllsch Copyright (c) 1998  Intel Corporation
6*b2c829d7Sjakllsch 
7*b2c829d7Sjakllsch Module Name:
8*b2c829d7Sjakllsch 
9*b2c829d7Sjakllsch     crc.c
10*b2c829d7Sjakllsch 
11*b2c829d7Sjakllsch Abstract:
12*b2c829d7Sjakllsch 
13*b2c829d7Sjakllsch     CRC32 functions
14*b2c829d7Sjakllsch 
15*b2c829d7Sjakllsch 
16*b2c829d7Sjakllsch 
17*b2c829d7Sjakllsch Revision History
18*b2c829d7Sjakllsch 
19*b2c829d7Sjakllsch --*/
20*b2c829d7Sjakllsch 
21*b2c829d7Sjakllsch #include "lib.h"
22*b2c829d7Sjakllsch 
23*b2c829d7Sjakllsch 
24*b2c829d7Sjakllsch UINT32 CRCTable[256] = {
25*b2c829d7Sjakllsch     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
26*b2c829d7Sjakllsch     0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
27*b2c829d7Sjakllsch     0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
28*b2c829d7Sjakllsch     0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
29*b2c829d7Sjakllsch     0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
30*b2c829d7Sjakllsch     0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
31*b2c829d7Sjakllsch     0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
32*b2c829d7Sjakllsch     0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
33*b2c829d7Sjakllsch     0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
34*b2c829d7Sjakllsch     0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
35*b2c829d7Sjakllsch     0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
36*b2c829d7Sjakllsch     0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
37*b2c829d7Sjakllsch     0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
38*b2c829d7Sjakllsch     0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
39*b2c829d7Sjakllsch     0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
40*b2c829d7Sjakllsch     0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
41*b2c829d7Sjakllsch     0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
42*b2c829d7Sjakllsch     0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
43*b2c829d7Sjakllsch     0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
44*b2c829d7Sjakllsch     0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
45*b2c829d7Sjakllsch     0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
46*b2c829d7Sjakllsch     0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
47*b2c829d7Sjakllsch     0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
48*b2c829d7Sjakllsch     0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
49*b2c829d7Sjakllsch     0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
50*b2c829d7Sjakllsch     0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
51*b2c829d7Sjakllsch     0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
52*b2c829d7Sjakllsch     0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
53*b2c829d7Sjakllsch     0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
54*b2c829d7Sjakllsch     0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
55*b2c829d7Sjakllsch     0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
56*b2c829d7Sjakllsch     0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
57*b2c829d7Sjakllsch     0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
58*b2c829d7Sjakllsch     0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
59*b2c829d7Sjakllsch     0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
60*b2c829d7Sjakllsch     0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
61*b2c829d7Sjakllsch     0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
62*b2c829d7Sjakllsch     0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
63*b2c829d7Sjakllsch     0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
64*b2c829d7Sjakllsch     0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
65*b2c829d7Sjakllsch     0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
66*b2c829d7Sjakllsch     0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
67*b2c829d7Sjakllsch     0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
68*b2c829d7Sjakllsch     };
69*b2c829d7Sjakllsch 
70*b2c829d7Sjakllsch 
71*b2c829d7Sjakllsch 
72*b2c829d7Sjakllsch VOID
SetCrc(IN OUT EFI_TABLE_HEADER * Hdr)73*b2c829d7Sjakllsch SetCrc (
74*b2c829d7Sjakllsch     IN OUT EFI_TABLE_HEADER *Hdr
75*b2c829d7Sjakllsch     )
76*b2c829d7Sjakllsch /*++
77*b2c829d7Sjakllsch 
78*b2c829d7Sjakllsch Routine Description:
79*b2c829d7Sjakllsch 
80*b2c829d7Sjakllsch     Updates the CRC32 value in the table header
81*b2c829d7Sjakllsch 
82*b2c829d7Sjakllsch Arguments:
83*b2c829d7Sjakllsch 
84*b2c829d7Sjakllsch     Hdr     - The table to update
85*b2c829d7Sjakllsch 
86*b2c829d7Sjakllsch Returns:
87*b2c829d7Sjakllsch 
88*b2c829d7Sjakllsch     None
89*b2c829d7Sjakllsch 
90*b2c829d7Sjakllsch --*/
91*b2c829d7Sjakllsch {
92*b2c829d7Sjakllsch     SetCrcAltSize (Hdr->HeaderSize, Hdr);
93*b2c829d7Sjakllsch }
94*b2c829d7Sjakllsch 
95*b2c829d7Sjakllsch VOID
SetCrcAltSize(IN UINTN Size,IN OUT EFI_TABLE_HEADER * Hdr)96*b2c829d7Sjakllsch SetCrcAltSize (
97*b2c829d7Sjakllsch     IN UINTN                 Size,
98*b2c829d7Sjakllsch     IN OUT EFI_TABLE_HEADER *Hdr
99*b2c829d7Sjakllsch     )
100*b2c829d7Sjakllsch /*++
101*b2c829d7Sjakllsch 
102*b2c829d7Sjakllsch Routine Description:
103*b2c829d7Sjakllsch 
104*b2c829d7Sjakllsch     Updates the CRC32 value in the table header
105*b2c829d7Sjakllsch 
106*b2c829d7Sjakllsch Arguments:
107*b2c829d7Sjakllsch 
108*b2c829d7Sjakllsch     Hdr     - The table to update
109*b2c829d7Sjakllsch 
110*b2c829d7Sjakllsch Returns:
111*b2c829d7Sjakllsch 
112*b2c829d7Sjakllsch     None
113*b2c829d7Sjakllsch 
114*b2c829d7Sjakllsch --*/
115*b2c829d7Sjakllsch {
116*b2c829d7Sjakllsch     Hdr->CRC32 = 0;
117*b2c829d7Sjakllsch     Hdr->CRC32 = CalculateCrc((UINT8 *)Hdr, Size);
118*b2c829d7Sjakllsch }
119*b2c829d7Sjakllsch 
120*b2c829d7Sjakllsch 
121*b2c829d7Sjakllsch BOOLEAN
CheckCrc(IN UINTN MaxSize,IN OUT EFI_TABLE_HEADER * Hdr)122*b2c829d7Sjakllsch CheckCrc (
123*b2c829d7Sjakllsch     IN UINTN                 MaxSize,
124*b2c829d7Sjakllsch     IN OUT EFI_TABLE_HEADER *Hdr
125*b2c829d7Sjakllsch     )
126*b2c829d7Sjakllsch /*++
127*b2c829d7Sjakllsch 
128*b2c829d7Sjakllsch Routine Description:
129*b2c829d7Sjakllsch 
130*b2c829d7Sjakllsch     Checks the CRC32 value in the table header
131*b2c829d7Sjakllsch 
132*b2c829d7Sjakllsch Arguments:
133*b2c829d7Sjakllsch 
134*b2c829d7Sjakllsch     Hdr     - The table to check
135*b2c829d7Sjakllsch 
136*b2c829d7Sjakllsch Returns:
137*b2c829d7Sjakllsch 
138*b2c829d7Sjakllsch     TRUE if the CRC is OK in the table
139*b2c829d7Sjakllsch 
140*b2c829d7Sjakllsch --*/
141*b2c829d7Sjakllsch {
142*b2c829d7Sjakllsch     return CheckCrcAltSize (MaxSize, Hdr->HeaderSize, Hdr);
143*b2c829d7Sjakllsch }
144*b2c829d7Sjakllsch 
145*b2c829d7Sjakllsch 
146*b2c829d7Sjakllsch 
147*b2c829d7Sjakllsch 
148*b2c829d7Sjakllsch BOOLEAN
CheckCrcAltSize(IN UINTN MaxSize,IN UINTN Size,IN OUT EFI_TABLE_HEADER * Hdr)149*b2c829d7Sjakllsch CheckCrcAltSize (
150*b2c829d7Sjakllsch     IN UINTN                 MaxSize,
151*b2c829d7Sjakllsch     IN UINTN                 Size,
152*b2c829d7Sjakllsch     IN OUT EFI_TABLE_HEADER *Hdr
153*b2c829d7Sjakllsch     )
154*b2c829d7Sjakllsch /*++
155*b2c829d7Sjakllsch 
156*b2c829d7Sjakllsch Routine Description:
157*b2c829d7Sjakllsch 
158*b2c829d7Sjakllsch     Checks the CRC32 value in the table header
159*b2c829d7Sjakllsch 
160*b2c829d7Sjakllsch Arguments:
161*b2c829d7Sjakllsch 
162*b2c829d7Sjakllsch     Hdr     - The table to check
163*b2c829d7Sjakllsch 
164*b2c829d7Sjakllsch Returns:
165*b2c829d7Sjakllsch 
166*b2c829d7Sjakllsch     TRUE if the CRC is OK in the table
167*b2c829d7Sjakllsch 
168*b2c829d7Sjakllsch --*/
169*b2c829d7Sjakllsch {
170*b2c829d7Sjakllsch     UINT32      Crc;
171*b2c829d7Sjakllsch     UINT32      OrgCrc;
172*b2c829d7Sjakllsch     BOOLEAN     f;
173*b2c829d7Sjakllsch 
174*b2c829d7Sjakllsch     if (Size == 0) {
175*b2c829d7Sjakllsch         //
176*b2c829d7Sjakllsch         // If header size is 0 CRC will pass so return FALSE here
177*b2c829d7Sjakllsch         //
178*b2c829d7Sjakllsch         return FALSE;
179*b2c829d7Sjakllsch     }
180*b2c829d7Sjakllsch     if (MaxSize && Size > MaxSize) {
181*b2c829d7Sjakllsch         DEBUG((D_ERROR, "CheckCrc32: Size > MaxSize\n"));
182*b2c829d7Sjakllsch         return FALSE;
183*b2c829d7Sjakllsch     }
184*b2c829d7Sjakllsch 
185*b2c829d7Sjakllsch     // clear old crc from header
186*b2c829d7Sjakllsch     OrgCrc = Hdr->CRC32;
187*b2c829d7Sjakllsch     Hdr->CRC32 = 0;
188*b2c829d7Sjakllsch     Crc = CalculateCrc((UINT8 *)Hdr, Size);
189*b2c829d7Sjakllsch 
190*b2c829d7Sjakllsch     // set restults
191*b2c829d7Sjakllsch     Hdr->CRC32 = OrgCrc;
192*b2c829d7Sjakllsch 
193*b2c829d7Sjakllsch     // return status
194*b2c829d7Sjakllsch     f = OrgCrc == (UINT32) Crc;
195*b2c829d7Sjakllsch     if (!f) {
196*b2c829d7Sjakllsch         DEBUG((D_ERROR, "CheckCrc32: Crc check failed\n"));
197*b2c829d7Sjakllsch     }
198*b2c829d7Sjakllsch 
199*b2c829d7Sjakllsch     return f;
200*b2c829d7Sjakllsch }
201*b2c829d7Sjakllsch 
202*b2c829d7Sjakllsch 
203*b2c829d7Sjakllsch UINT32
CalculateCrc(UINT8 * pt,UINTN Size)204*b2c829d7Sjakllsch CalculateCrc (
205*b2c829d7Sjakllsch     UINT8 *pt,
206*b2c829d7Sjakllsch     UINTN Size
207*b2c829d7Sjakllsch     )
208*b2c829d7Sjakllsch {
209*b2c829d7Sjakllsch     UINTN Crc;
210*b2c829d7Sjakllsch 
211*b2c829d7Sjakllsch     // compute crc
212*b2c829d7Sjakllsch     Crc = 0xffffffff;
213*b2c829d7Sjakllsch     while (Size) {
214*b2c829d7Sjakllsch         Crc = (Crc >> 8) ^ CRCTable[(UINT8) Crc ^ *pt];
215*b2c829d7Sjakllsch         pt += 1;
216*b2c829d7Sjakllsch         Size -= 1;
217*b2c829d7Sjakllsch     }
218*b2c829d7Sjakllsch     Crc = Crc ^ 0xffffffff;
219*b2c829d7Sjakllsch     return (UINT32)Crc;
220*b2c829d7Sjakllsch }
221