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Side by Side Diff: third_party/lzma_sdk/7zCrcOpt.c

Issue 1700453002: Update lzma_sdk sources to 15.14. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Chromium modifications Created 4 years, 10 months ago
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1 /* 7zCrcOpt.c -- CRC32 calculation : optimized version 1 /* 7zCrcOpt.c -- CRC32 calculation
2 2009-11-23 : Igor Pavlov : Public domain */ 2 2015-03-01 : Igor Pavlov : Public domain */
3 3
4 #include "Precomp.h"
5
4 #include "CpuArch.h" 6 #include "CpuArch.h"
5 7
6 #ifdef MY_CPU_LE 8 #ifndef MY_CPU_BE
7 9
8 #define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8)) 10 #define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
9 11
10 UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const U Int32 *table) 12 UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const U Int32 *table)
11 { 13 {
12 const Byte *p = (const Byte *)data; 14 const Byte *p = (const Byte *)data;
13 for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++) 15 for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
14 v = CRC_UPDATE_BYTE_2(v, *p); 16 v = CRC_UPDATE_BYTE_2(v, *p);
15 for (; size >= 4; size -= 4, p += 4) 17 for (; size >= 4; size -= 4, p += 4)
16 { 18 {
17 v ^= *(const UInt32 *)p; 19 v ^= *(const UInt32 *)p;
18 v = 20 v =
19 table[0x300 + (v & 0xFF)] ^ 21 table[0x300 + ((v ) & 0xFF)]
20 table[0x200 + ((v >> 8) & 0xFF)] ^ 22 ^ table[0x200 + ((v >> 8) & 0xFF)]
21 table[0x100 + ((v >> 16) & 0xFF)] ^ 23 ^ table[0x100 + ((v >> 16) & 0xFF)]
22 table[0x000 + ((v >> 24))]; 24 ^ table[0x000 + ((v >> 24))];
23 } 25 }
24 for (; size > 0; size--, p++) 26 for (; size > 0; size--, p++)
25 v = CRC_UPDATE_BYTE_2(v, *p); 27 v = CRC_UPDATE_BYTE_2(v, *p);
26 return v; 28 return v;
27 } 29 }
28 30
29 UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const U Int32 *table) 31 UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const U Int32 *table)
30 { 32 {
31 return CrcUpdateT4(v, data, size, table); 33 const Byte *p = (const Byte *)data;
34 for (; size > 0 && ((unsigned)(ptrdiff_t)p & 7) != 0; size--, p++)
35 v = CRC_UPDATE_BYTE_2(v, *p);
36 for (; size >= 8; size -= 8, p += 8)
37 {
38 UInt32 d;
39 v ^= *(const UInt32 *)p;
40 v =
41 table[0x700 + ((v ) & 0xFF)]
42 ^ table[0x600 + ((v >> 8) & 0xFF)]
43 ^ table[0x500 + ((v >> 16) & 0xFF)]
44 ^ table[0x400 + ((v >> 24))];
45 d = *((const UInt32 *)p + 1);
46 v ^=
47 table[0x300 + ((d ) & 0xFF)]
48 ^ table[0x200 + ((d >> 8) & 0xFF)]
49 ^ table[0x100 + ((d >> 16) & 0xFF)]
50 ^ table[0x000 + ((d >> 24))];
51 }
52 for (; size > 0; size--, p++)
53 v = CRC_UPDATE_BYTE_2(v, *p);
54 return v;
32 } 55 }
33 56
34 #endif 57 #endif
58
59
60 #ifndef MY_CPU_LE
61
62 #define CRC_UINT32_SWAP(v) ((v >> 24) | ((v >> 8) & 0xFF00) | ((v << 8) & 0xFF00 00) | (v << 24))
63
64 #define CRC_UPDATE_BYTE_2_BE(crc, b) (table[(((crc) >> 24) ^ (b))] ^ ((crc) << 8 ))
65
66 UInt32 MY_FAST_CALL CrcUpdateT1_BeT4(UInt32 v, const void *data, size_t size, co nst UInt32 *table)
67 {
68 const Byte *p = (const Byte *)data;
69 table += 0x100;
70 v = CRC_UINT32_SWAP(v);
71 for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
72 v = CRC_UPDATE_BYTE_2_BE(v, *p);
73 for (; size >= 4; size -= 4, p += 4)
74 {
75 v ^= *(const UInt32 *)p;
76 v =
77 table[0x000 + ((v ) & 0xFF)]
78 ^ table[0x100 + ((v >> 8) & 0xFF)]
79 ^ table[0x200 + ((v >> 16) & 0xFF)]
80 ^ table[0x300 + ((v >> 24))];
81 }
82 for (; size > 0; size--, p++)
83 v = CRC_UPDATE_BYTE_2_BE(v, *p);
84 return CRC_UINT32_SWAP(v);
85 }
86
87 UInt32 MY_FAST_CALL CrcUpdateT1_BeT8(UInt32 v, const void *data, size_t size, co nst UInt32 *table)
88 {
89 const Byte *p = (const Byte *)data;
90 table += 0x100;
91 v = CRC_UINT32_SWAP(v);
92 for (; size > 0 && ((unsigned)(ptrdiff_t)p & 7) != 0; size--, p++)
93 v = CRC_UPDATE_BYTE_2_BE(v, *p);
94 for (; size >= 8; size -= 8, p += 8)
95 {
96 UInt32 d;
97 v ^= *(const UInt32 *)p;
98 v =
99 table[0x400 + ((v ) & 0xFF)]
100 ^ table[0x500 + ((v >> 8) & 0xFF)]
101 ^ table[0x600 + ((v >> 16) & 0xFF)]
102 ^ table[0x700 + ((v >> 24))];
103 d = *((const UInt32 *)p + 1);
104 v ^=
105 table[0x000 + ((d ) & 0xFF)]
106 ^ table[0x100 + ((d >> 8) & 0xFF)]
107 ^ table[0x200 + ((d >> 16) & 0xFF)]
108 ^ table[0x300 + ((d >> 24))];
109 }
110 for (; size > 0; size--, p++)
111 v = CRC_UPDATE_BYTE_2_BE(v, *p);
112 return CRC_UINT32_SWAP(v);
113 }
114
115 #endif
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