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Support for ARM requires non-accelerated CRC. (eBay#264)
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@@ -105,3 +105,4 @@ cmake-*/** | |
# Visual Studio | ||
CMakeSettings.json | ||
.vs/** | ||
.cache |
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#pragma once | ||
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// Only x86 and x86_64 supported by Intel Storage Acceleration library | ||
#ifndef NO_ISAL | ||
#include <isa-l/crc.h> | ||
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#else | ||
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extern "C" { | ||
// crc16_t10dif reference function, slow crc16 from the definition. | ||
uint16_t crc16_t10dif(uint16_t seed, const unsigned char* buf, uint64_t len); | ||
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// crc32_ieee reference function, slow crc32 from the definition. | ||
uint32_t crc32_ieee(uint32_t seed, const unsigned char* buf, uint64_t len); | ||
} | ||
#endif |
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// Only x86 and x86_64 supported by Intel Storage Acceleration library | ||
#ifdef NO_ISAL | ||
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#include <cstdint> | ||
#include <cstddef> | ||
extern "C" { | ||
#define MAX_ITER 8 | ||
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// crc16_t10dif reference function, slow crc16 from the definition. | ||
uint16_t crc16_t10dif(uint16_t seed, const unsigned char* buf, uint64_t len) { | ||
size_t rem = seed; | ||
unsigned int i, j; | ||
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uint16_t poly = 0x8bb7; // t10dif standard | ||
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for (i = 0; i < len; i++) { | ||
rem = rem ^ (buf[i] << 8); | ||
for (j = 0; j < MAX_ITER; j++) { | ||
rem = rem << 1; | ||
rem = (rem & 0x10000) ? rem ^ poly : rem; | ||
} | ||
} | ||
return rem; | ||
} | ||
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// crc32_ieee reference function, slow crc32 from the definition. | ||
uint32_t crc32_ieee(uint32_t seed, const unsigned char* buf, uint64_t len) { | ||
uint64_t rem = ~seed; | ||
unsigned int i, j; | ||
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uint32_t poly = 0x04C11DB7; // IEEE standard | ||
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for (i = 0; i < len; i++) { | ||
rem = rem ^ ((uint64_t)buf[i] << 24); | ||
for (j = 0; j < MAX_ITER; j++) { | ||
rem = rem << 1; | ||
rem = (rem & 0x100000000ULL) ? rem ^ poly : rem; | ||
} | ||
} | ||
return ~rem; | ||
} | ||
} | ||
#endif |
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