68b2e7f763
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77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/* crc32_acle.c -- compute the CRC-32 of a data stream
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* Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
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* Copyright (C) 2016 Yang Zhang
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* For conditions of distribution and use, see copyright notice in zlib.h
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*
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*/
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#ifdef ARM_ACLE
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#include "acle_intrins.h"
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#include "zbuild.h"
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Z_INTERNAL Z_TARGET_CRC uint32_t crc32_acle(uint32_t crc, const uint8_t *buf, size_t len) {
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Z_REGISTER uint32_t c;
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Z_REGISTER uint16_t buf2;
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Z_REGISTER uint32_t buf4;
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Z_REGISTER uint64_t buf8;
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c = ~crc;
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if (UNLIKELY(len == 1)) {
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c = __crc32b(c, *buf);
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c = ~c;
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return c;
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}
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if ((ptrdiff_t)buf & (sizeof(uint64_t) - 1)) {
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if (len && ((ptrdiff_t)buf & 1)) {
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c = __crc32b(c, *buf++);
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len--;
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}
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if ((len >= sizeof(uint16_t)) && ((ptrdiff_t)buf & (sizeof(uint32_t) - 1))) {
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buf2 = *((uint16_t*)buf);
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c = __crc32h(c, buf2);
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buf += sizeof(uint16_t);
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len -= sizeof(uint16_t);
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}
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if ((len >= sizeof(uint32_t)) && ((ptrdiff_t)buf & (sizeof(uint64_t) - 1))) {
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buf4 = *((uint32_t*)buf);
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c = __crc32w(c, buf4);
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len -= sizeof(uint32_t);
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buf += sizeof(uint32_t);
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}
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}
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while (len >= sizeof(uint64_t)) {
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buf8 = *((uint64_t*)buf);
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c = __crc32d(c, buf8);
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len -= sizeof(uint64_t);
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buf += sizeof(uint64_t);
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}
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if (len >= sizeof(uint32_t)) {
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buf4 = *((uint32_t*)buf);
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c = __crc32w(c, buf4);
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len -= sizeof(uint32_t);
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buf += sizeof(uint32_t);
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}
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if (len >= sizeof(uint16_t)) {
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buf2 = *((uint16_t*)buf);
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c = __crc32h(c, buf2);
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len -= sizeof(uint16_t);
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buf += sizeof(uint16_t);
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}
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if (len) {
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c = __crc32b(c, *buf);
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}
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c = ~c;
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return c;
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}
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#endif
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