Edit File: crc32.c
/* +----------------------------------------------------------------------+ | Copyright (c) The PHP Group | +----------------------------------------------------------------------+ | This source file is subject to version 3.01 of the PHP license, | | that is bundled with this package in the file LICENSE, and is | | available through the world-wide-web at the following url: | | https://www.php.net/license/3_01.txt | | If you did not receive a copy of the PHP license and are unable to | | obtain it through the world-wide-web, please send a note to | | license@php.net so we can mail you a copy immediately. | +----------------------------------------------------------------------+ | Author: Rasmus Lerdorf <rasmus@php.net> | +----------------------------------------------------------------------+ */ #include "php.h" #include "basic_functions.h" #include "crc32.h" #include "crc32_x86.h" #ifdef HAVE_AARCH64_CRC32 #ifndef PHP_WIN32 # include <arm_acle.h> #endif # if defined(__linux__) # include <sys/auxv.h> # include <asm/hwcap.h> # elif defined(__APPLE__) # include <sys/sysctl.h> # elif defined(__FreeBSD__) # include <sys/auxv.h> static unsigned long getauxval(unsigned long key) { unsigned long ret = 0; if (elf_aux_info(key, &ret, sizeof(ret)) != 0) return 0; return ret; } # endif static inline int has_crc32_insn() { /* Only go through the runtime detection once. */ static int res = -1; if (res != -1) return res; # if defined(HWCAP_CRC32) res = getauxval(AT_HWCAP) & HWCAP_CRC32; return res; # elif defined(HWCAP2_CRC32) res = getauxval(AT_HWCAP2) & HWCAP2_CRC32; return res; # elif defined(__APPLE__) size_t reslen = sizeof(res); if (sysctlbyname("hw.optional.armv8_crc32", &res, &reslen, NULL, 0) < 0) res = 0; return res; # elif defined(WIN32) res = (int)IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE); return res; # else res = 0; return res; # endif } # if defined(__GNUC__) # if!defined(__clang__) # pragma GCC push_options # pragma GCC target ("+nothing+crc") # else # pragma clang attribute push(__attribute__((target("+nothing+crc"))), apply_to=function) # endif # endif static uint32_t crc32_aarch64(uint32_t crc, const char *p, size_t nr) { while (nr >= sizeof(uint64_t)) { crc = __crc32d(crc, *(uint64_t *)p); p += sizeof(uint64_t); nr -= sizeof(uint64_t); } if (nr >= sizeof(int32_t)) { crc = __crc32w(crc, *(uint32_t *)p); p += sizeof(uint32_t); nr -= sizeof(uint32_t); } if (nr >= sizeof(int16_t)) { crc = __crc32h(crc, *(uint16_t *)p); p += sizeof(uint16_t); nr -= sizeof(uint16_t); } if (nr) { crc = __crc32b(crc, *p); } return crc; } # if defined(__GNUC__) # if !defined(__clang__) # pragma GCC pop_options # else # pragma clang attribute pop # endif # endif #endif PHPAPI uint32_t php_crc32_bulk_update(uint32_t crc, const char *p, size_t nr) { #ifdef HAVE_AARCH64_CRC32 if (has_crc32_insn()) { crc = crc32_aarch64(crc, p, nr); return crc; } #endif #if ZEND_INTRIN_SSE4_2_PCLMUL_NATIVE || ZEND_INTRIN_SSE4_2_PCLMUL_RESOLVER size_t nr_simd = crc32_x86_simd_update(X86_CRC32B, &crc, (const unsigned char *)p, nr); nr -= nr_simd; p += nr_simd; #endif /* The trailing part */ for (; nr--; ++p) { crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF ]; } return crc; } PHPAPI int php_crc32_stream_bulk_update(uint32_t *crc, php_stream *fp, size_t nr) { size_t handled = 0, n; char buf[1024]; while (handled < nr) { n = nr - handled; n = (n < sizeof(buf)) ? n : sizeof(buf); /* tweak to buf size */ n = php_stream_read(fp, buf, n); if (n > 0) { *crc = php_crc32_bulk_update(*crc, buf, n); handled += n; } else { /* EOF */ return FAILURE; } } return SUCCESS; } /* {{{ Calculate the crc32 polynomial of a string */ PHP_FUNCTION(crc32) { char *p; size_t nr; uint32_t crc = php_crc32_bulk_init(); ZEND_PARSE_PARAMETERS_START(1, 1) Z_PARAM_STRING(p, nr) ZEND_PARSE_PARAMETERS_END(); crc = php_crc32_bulk_update(crc, p, nr); RETURN_LONG(php_crc32_bulk_end(crc)); } /* }}} */