153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
// Copyright(c) 2012 - 2013 The Cryptonote developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#pragma once
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#include <assert.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#if defined(_MSC_VER)
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#include <stdlib.h>
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static inline uint32_t rol32(uint32_t x, int r) {
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static_assert(sizeof(uint32_t) == sizeof(unsigned int), "this code assumes 32-bit integers");
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return _rotl(x, r);
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}
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static inline uint64_t rol64(uint64_t x, int r) {
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return _rotl64(x, r);
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}
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#else
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static inline uint32_t rol32(uint32_t x, int r) {
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return (x << (r & 31)) | (x >> (-r & 31));
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}
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static inline uint64_t rol64(uint64_t x, int r) {
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return (x << (r & 63)) | (x >> (-r & 63));
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}
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#endif
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static inline uint64_t hi_dword(uint64_t val) {
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return val >> 32;
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}
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static inline uint64_t lo_dword(uint64_t val) {
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return val & 0xFFFFFFFF;
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}
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static inline uint64_t div_with_reminder(uint64_t dividend, uint32_t divisor, uint32_t* remainder) {
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dividend |= ((uint64_t)*remainder) << 32;
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*remainder = dividend % divisor;
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return dividend / divisor;
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}
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// Long division with 2^32 base
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static inline uint32_t div128_32(uint64_t dividend_hi, uint64_t dividend_lo, uint32_t divisor, uint64_t* quotient_hi, uint64_t* quotient_lo) {
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uint64_t dividend_dwords[4];
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uint32_t remainder = 0;
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dividend_dwords[3] = hi_dword(dividend_hi);
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dividend_dwords[2] = lo_dword(dividend_hi);
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dividend_dwords[1] = hi_dword(dividend_lo);
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dividend_dwords[0] = lo_dword(dividend_lo);
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*quotient_hi = div_with_reminder(dividend_dwords[3], divisor, &remainder) << 32;
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*quotient_hi |= div_with_reminder(dividend_dwords[2], divisor, &remainder);
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*quotient_lo = div_with_reminder(dividend_dwords[1], divisor, &remainder) << 32;
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*quotient_lo |= div_with_reminder(dividend_dwords[0], divisor, &remainder);
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return remainder;
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}
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#define IDENT32(x) ((uint32_t) (x))
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#define IDENT64(x) ((uint64_t) (x))
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#define SWAP32(x) ((((uint32_t) (x) & 0x000000ff) << 24) | \
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(((uint32_t) (x) & 0x0000ff00) << 8) | \
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(((uint32_t) (x) & 0x00ff0000) >> 8) | \
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(((uint32_t) (x) & 0xff000000) >> 24))
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#define SWAP64(x) ((((uint64_t) (x) & 0x00000000000000ff) << 56) | \
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(((uint64_t) (x) & 0x000000000000ff00) << 40) | \
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(((uint64_t) (x) & 0x0000000000ff0000) << 24) | \
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(((uint64_t) (x) & 0x00000000ff000000) << 8) | \
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(((uint64_t) (x) & 0x000000ff00000000) >> 8) | \
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(((uint64_t) (x) & 0x0000ff0000000000) >> 24) | \
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(((uint64_t) (x) & 0x00ff000000000000) >> 40) | \
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(((uint64_t) (x) & 0xff00000000000000) >> 56))
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static inline uint32_t ident32(uint32_t x) { return x; }
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static inline uint64_t ident64(uint64_t x) { return x; }
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static inline uint32_t swap32(uint32_t x) {
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x = ((x & 0x00ff00ff) << 8) | ((x & 0xff00ff00) >> 8);
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return (x << 16) | (x >> 16);
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}
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static inline uint64_t swap64(uint64_t x) {
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x = ((x & 0x00ff00ff00ff00ff) << 8) | ((x & 0xff00ff00ff00ff00) >> 8);
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x = ((x & 0x0000ffff0000ffff) << 16) | ((x & 0xffff0000ffff0000) >> 16);
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return (x << 32) | (x >> 32);
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}
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#if defined(__GNUC__)
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#define UNUSED __attribute__((unused))
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#else
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#define UNUSED
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#endif
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static inline void mem_inplace_ident(void *mem UNUSED, size_t n UNUSED) { }
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#undef UNUSED
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static inline void mem_inplace_swap32(void *mem, size_t n) {
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size_t i;
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for (i = 0; i < n; i++) {
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((uint32_t *)mem)[i] = swap32(((const uint32_t *)mem)[i]);
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}
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}
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static inline void mem_inplace_swap64(void *mem, size_t n) {
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size_t i;
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for (i = 0; i < n; i++) {
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((uint64_t *)mem)[i] = swap64(((const uint64_t *)mem)[i]);
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}
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}
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static inline void memcpy_ident32(void *dst, const void *src, size_t n) {
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memcpy(dst, src, 4 * n);
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}
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static inline void memcpy_ident64(void *dst, const void *src, size_t n) {
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memcpy(dst, src, 8 * n);
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}
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static inline void memcpy_swap32(void *dst, const void *src, size_t n) {
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size_t i;
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for (i = 0; i < n; i++) {
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((uint32_t *)dst)[i] = swap32(((const uint32_t *)src)[i]);
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}
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}
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static inline void memcpy_swap64(void *dst, const void *src, size_t n) {
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size_t i;
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for (i = 0; i < n; i++) {
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((uint64_t *)dst)[i] = swap64(((const uint64_t *)src)[i]);
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}
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}
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#define SWAP32LE IDENT32
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#define SWAP32BE SWAP32
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#define swap32le ident32
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#define swap32be swap32
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#define mem_inplace_swap32le mem_inplace_ident
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#define mem_inplace_swap32be mem_inplace_swap32
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#define memcpy_swap32le memcpy_ident32
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#define memcpy_swap32be memcpy_swap32
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#define SWAP64LE IDENT64
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#define SWAP64BE SWAP64
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#define swap64le ident64
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#define swap64be swap64
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#define mem_inplace_swap64le mem_inplace_ident
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#define mem_inplace_swap64be mem_inplace_swap64
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#define memcpy_swap64le memcpy_ident64
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#define memcpy_swap64be memcpy_swap64 |