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320 lines
10 KiB
C
320 lines
10 KiB
C
// Copyright (c) 2014-2020, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
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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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#ifndef _MSC_VER
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#include <sys/param.h>
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#endif
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#if defined(__ANDROID__)
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#include <byteswap.h>
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#endif
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#if defined(__sun) && defined(__SVR4)
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#include <endian.h>
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#endif
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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 mul128(uint64_t multiplier, uint64_t multiplicand, uint64_t* product_hi) {
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// multiplier = ab = a * 2^32 + b
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// multiplicand = cd = c * 2^32 + d
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// ab * cd = a * c * 2^64 + (a * d + b * c) * 2^32 + b * d
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uint64_t a = hi_dword(multiplier);
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uint64_t b = lo_dword(multiplier);
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uint64_t c = hi_dword(multiplicand);
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uint64_t d = lo_dword(multiplicand);
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uint64_t ac = a * c;
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uint64_t ad = a * d;
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uint64_t bc = b * c;
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uint64_t bd = b * d;
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uint64_t adbc = ad + bc;
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uint64_t adbc_carry = adbc < ad ? 1 : 0;
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// multiplier * multiplicand = product_hi * 2^64 + product_lo
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uint64_t product_lo = bd + (adbc << 32);
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uint64_t product_lo_carry = product_lo < bd ? 1 : 0;
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*product_hi = ac + (adbc >> 32) + (adbc_carry << 32) + product_lo_carry;
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assert(ac <= *product_hi);
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return product_lo;
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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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// Long divisor with 2^64 base
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void div128_64(uint64_t dividend_hi, uint64_t dividend_lo, uint64_t divisor, uint64_t* quotient_hi, uint64_t *quotient_lo, uint64_t *remainder_hi, uint64_t *remainder_lo);
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static inline void add64clamp(uint64_t *value, uint64_t add)
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{
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static const uint64_t maxval = (uint64_t)-1;
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if (*value > maxval - add)
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*value = maxval;
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else
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*value += add;
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}
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static inline void sub64clamp(uint64_t *value, uint64_t sub)
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{
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if (*value < sub)
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*value = 0;
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else
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*value -= sub;
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}
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#define IDENT16(x) ((uint16_t) (x))
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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 SWAP16(x) ((((uint16_t) (x) & 0x00ff) << 8) | \
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(((uint16_t) (x) & 0xff00) >> 8))
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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 uint16_t ident16(uint16_t x) { return x; }
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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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#ifndef __OpenBSD__
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# if defined(__ANDROID__) && defined(__swap16) && !defined(swap16)
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# define swap16 __swap16
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# elif !defined(swap16)
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static inline uint16_t swap16(uint16_t x) {
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return ((x & 0x00ff) << 8) | ((x & 0xff00) >> 8);
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}
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# endif
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# if defined(__ANDROID__) && defined(__swap32) && !defined(swap32)
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# define swap32 __swap32
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# elif !defined(swap32)
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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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# endif
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# if defined(__ANDROID__) && defined(__swap64) && !defined(swap64)
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# define swap64 __swap64
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# elif !defined(swap64)
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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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# endif
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#endif /* __OpenBSD__ */
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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_swap16(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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((uint16_t *) mem)[i] = swap16(((const uint16_t *) mem)[i]);
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}
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}
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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_ident16(void *dst, const void *src, size_t n) {
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memcpy(dst, src, 2 * n);
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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_swap16(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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((uint16_t *) dst)[i] = swap16(((const uint16_t *) src)[i]);
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}
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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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#ifdef _MSC_VER
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# define LITTLE_ENDIAN 1234
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# define BIG_ENDIAN 4321
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# define BYTE_ORDER LITTLE_ENDIAN
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#endif
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#if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN) || !defined(BIG_ENDIAN)
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static_assert(false, "BYTE_ORDER is undefined. Perhaps, GNU extensions are not enabled");
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define SWAP16LE IDENT16
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#define SWAP16BE SWAP16
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#define swap16le ident16
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#define swap16be swap16
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#define mem_inplace_swap16le mem_inplace_ident
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#define mem_inplace_swap16be mem_inplace_swap16
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#define memcpy_swap16le memcpy_ident16
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#define memcpy_swap16be memcpy_swap16
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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
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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#define SWAP16BE IDENT16
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#define SWAP16LE SWAP16
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#define swap16be ident16
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#define swap16le swap16
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#define mem_inplace_swap16be mem_inplace_ident
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#define mem_inplace_swap16le mem_inplace_swap16
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#define memcpy_swap16be memcpy_ident16
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#define memcpy_swap16le memcpy_swap16
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#define SWAP32BE IDENT32
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#define SWAP32LE SWAP32
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#define swap32be ident32
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#define swap32le swap32
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#define mem_inplace_swap32be mem_inplace_ident
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#define mem_inplace_swap32le mem_inplace_swap32
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#define memcpy_swap32be memcpy_ident32
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#define memcpy_swap32le memcpy_swap32
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#define SWAP64BE IDENT64
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#define SWAP64LE SWAP64
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#define swap64be ident64
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#define swap64le swap64
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#define mem_inplace_swap64be mem_inplace_ident
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#define mem_inplace_swap64le mem_inplace_swap64
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#define memcpy_swap64be memcpy_ident64
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#define memcpy_swap64le memcpy_swap64
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#endif
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