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-rw-r--r--NorthstarDLL/include/rapidjson/internal/biginteger.h290
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diff --git a/NorthstarDLL/include/rapidjson/internal/biginteger.h b/NorthstarDLL/include/rapidjson/internal/biginteger.h
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-// Tencent is pleased to support the open source community by making RapidJSON available.
-//
-// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
-//
-// Licensed under the MIT License (the "License"); you may not use this file except
-// in compliance with the License. You may obtain a copy of the License at
-//
-// http://opensource.org/licenses/MIT
-//
-// Unless required by applicable law or agreed to in writing, software distributed
-// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
-// CONDITIONS OF ANY KIND, either express or implied. See the License for the
-// specific language governing permissions and limitations under the License.
-
-#ifndef RAPIDJSON_BIGINTEGER_H_
-#define RAPIDJSON_BIGINTEGER_H_
-
-#include "../rapidjson.h"
-
-#if defined(_MSC_VER) && defined(_M_AMD64)
-#include <intrin.h> // for _umul128
-#pragma intrinsic(_umul128)
-#endif
-
-RAPIDJSON_NAMESPACE_BEGIN
-namespace internal {
-
-class BigInteger {
-public:
- typedef uint64_t Type;
-
- BigInteger(const BigInteger& rhs) : count_(rhs.count_) {
- std::memcpy(digits_, rhs.digits_, count_ * sizeof(Type));
- }
-
- explicit BigInteger(uint64_t u) : count_(1) {
- digits_[0] = u;
- }
-
- BigInteger(const char* decimals, size_t length) : count_(1) {
- RAPIDJSON_ASSERT(length > 0);
- digits_[0] = 0;
- size_t i = 0;
- const size_t kMaxDigitPerIteration = 19; // 2^64 = 18446744073709551616 > 10^19
- while (length >= kMaxDigitPerIteration) {
- AppendDecimal64(decimals + i, decimals + i + kMaxDigitPerIteration);
- length -= kMaxDigitPerIteration;
- i += kMaxDigitPerIteration;
- }
-
- if (length > 0)
- AppendDecimal64(decimals + i, decimals + i + length);
- }
-
- BigInteger& operator=(const BigInteger &rhs)
- {
- if (this != &rhs) {
- count_ = rhs.count_;
- std::memcpy(digits_, rhs.digits_, count_ * sizeof(Type));
- }
- return *this;
- }
-
- BigInteger& operator=(uint64_t u) {
- digits_[0] = u;
- count_ = 1;
- return *this;
- }
-
- BigInteger& operator+=(uint64_t u) {
- Type backup = digits_[0];
- digits_[0] += u;
- for (size_t i = 0; i < count_ - 1; i++) {
- if (digits_[i] >= backup)
- return *this; // no carry
- backup = digits_[i + 1];
- digits_[i + 1] += 1;
- }
-
- // Last carry
- if (digits_[count_ - 1] < backup)
- PushBack(1);
-
- return *this;
- }
-
- BigInteger& operator*=(uint64_t u) {
- if (u == 0) return *this = 0;
- if (u == 1) return *this;
- if (*this == 1) return *this = u;
-
- uint64_t k = 0;
- for (size_t i = 0; i < count_; i++) {
- uint64_t hi;
- digits_[i] = MulAdd64(digits_[i], u, k, &hi);
- k = hi;
- }
-
- if (k > 0)
- PushBack(k);
-
- return *this;
- }
-
- BigInteger& operator*=(uint32_t u) {
- if (u == 0) return *this = 0;
- if (u == 1) return *this;
- if (*this == 1) return *this = u;
-
- uint64_t k = 0;
- for (size_t i = 0; i < count_; i++) {
- const uint64_t c = digits_[i] >> 32;
- const uint64_t d = digits_[i] & 0xFFFFFFFF;
- const uint64_t uc = u * c;
- const uint64_t ud = u * d;
- const uint64_t p0 = ud + k;
- const uint64_t p1 = uc + (p0 >> 32);
- digits_[i] = (p0 & 0xFFFFFFFF) | (p1 << 32);
- k = p1 >> 32;
- }
-
- if (k > 0)
- PushBack(k);
-
- return *this;
- }
-
- BigInteger& operator<<=(size_t shift) {
- if (IsZero() || shift == 0) return *this;
-
- size_t offset = shift / kTypeBit;
- size_t interShift = shift % kTypeBit;
- RAPIDJSON_ASSERT(count_ + offset <= kCapacity);
-
- if (interShift == 0) {
- std::memmove(&digits_[count_ - 1 + offset], &digits_[count_ - 1], count_ * sizeof(Type));
- count_ += offset;
- }
- else {
- digits_[count_] = 0;
- for (size_t i = count_; i > 0; i--)
- digits_[i + offset] = (digits_[i] << interShift) | (digits_[i - 1] >> (kTypeBit - interShift));
- digits_[offset] = digits_[0] << interShift;
- count_ += offset;
- if (digits_[count_])
- count_++;
- }
-
- std::memset(digits_, 0, offset * sizeof(Type));
-
- return *this;
- }
-
- bool operator==(const BigInteger& rhs) const {
- return count_ == rhs.count_ && std::memcmp(digits_, rhs.digits_, count_ * sizeof(Type)) == 0;
- }
-
- bool operator==(const Type rhs) const {
- return count_ == 1 && digits_[0] == rhs;
- }
-
- BigInteger& MultiplyPow5(unsigned exp) {
- static const uint32_t kPow5[12] = {
- 5,
- 5 * 5,
- 5 * 5 * 5,
- 5 * 5 * 5 * 5,
- 5 * 5 * 5 * 5 * 5,
- 5 * 5 * 5 * 5 * 5 * 5,
- 5 * 5 * 5 * 5 * 5 * 5 * 5,
- 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
- 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
- 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
- 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5,
- 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5 * 5
- };
- if (exp == 0) return *this;
- for (; exp >= 27; exp -= 27) *this *= RAPIDJSON_UINT64_C2(0X6765C793, 0XFA10079D); // 5^27
- for (; exp >= 13; exp -= 13) *this *= static_cast<uint32_t>(1220703125u); // 5^13
- if (exp > 0) *this *= kPow5[exp - 1];
- return *this;
- }
-
- // Compute absolute difference of this and rhs.
- // Assume this != rhs
- bool Difference(const BigInteger& rhs, BigInteger* out) const {
- int cmp = Compare(rhs);
- RAPIDJSON_ASSERT(cmp != 0);
- const BigInteger *a, *b; // Makes a > b
- bool ret;
- if (cmp < 0) { a = &rhs; b = this; ret = true; }
- else { a = this; b = &rhs; ret = false; }
-
- Type borrow = 0;
- for (size_t i = 0; i < a->count_; i++) {
- Type d = a->digits_[i] - borrow;
- if (i < b->count_)
- d -= b->digits_[i];
- borrow = (d > a->digits_[i]) ? 1 : 0;
- out->digits_[i] = d;
- if (d != 0)
- out->count_ = i + 1;
- }
-
- return ret;
- }
-
- int Compare(const BigInteger& rhs) const {
- if (count_ != rhs.count_)
- return count_ < rhs.count_ ? -1 : 1;
-
- for (size_t i = count_; i-- > 0;)
- if (digits_[i] != rhs.digits_[i])
- return digits_[i] < rhs.digits_[i] ? -1 : 1;
-
- return 0;
- }
-
- size_t GetCount() const { return count_; }
- Type GetDigit(size_t index) const { RAPIDJSON_ASSERT(index < count_); return digits_[index]; }
- bool IsZero() const { return count_ == 1 && digits_[0] == 0; }
-
-private:
- void AppendDecimal64(const char* begin, const char* end) {
- uint64_t u = ParseUint64(begin, end);
- if (IsZero())
- *this = u;
- else {
- unsigned exp = static_cast<unsigned>(end - begin);
- (MultiplyPow5(exp) <<= exp) += u; // *this = *this * 10^exp + u
- }
- }
-
- void PushBack(Type digit) {
- RAPIDJSON_ASSERT(count_ < kCapacity);
- digits_[count_++] = digit;
- }
-
- static uint64_t ParseUint64(const char* begin, const char* end) {
- uint64_t r = 0;
- for (const char* p = begin; p != end; ++p) {
- RAPIDJSON_ASSERT(*p >= '0' && *p <= '9');
- r = r * 10u + static_cast<unsigned>(*p - '0');
- }
- return r;
- }
-
- // Assume a * b + k < 2^128
- static uint64_t MulAdd64(uint64_t a, uint64_t b, uint64_t k, uint64_t* outHigh) {
-#if defined(_MSC_VER) && defined(_M_AMD64)
- uint64_t low = _umul128(a, b, outHigh) + k;
- if (low < k)
- (*outHigh)++;
- return low;
-#elif (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) && defined(__x86_64__)
- __extension__ typedef unsigned __int128 uint128;
- uint128 p = static_cast<uint128>(a) * static_cast<uint128>(b);
- p += k;
- *outHigh = static_cast<uint64_t>(p >> 64);
- return static_cast<uint64_t>(p);
-#else
- const uint64_t a0 = a & 0xFFFFFFFF, a1 = a >> 32, b0 = b & 0xFFFFFFFF, b1 = b >> 32;
- uint64_t x0 = a0 * b0, x1 = a0 * b1, x2 = a1 * b0, x3 = a1 * b1;
- x1 += (x0 >> 32); // can't give carry
- x1 += x2;
- if (x1 < x2)
- x3 += (static_cast<uint64_t>(1) << 32);
- uint64_t lo = (x1 << 32) + (x0 & 0xFFFFFFFF);
- uint64_t hi = x3 + (x1 >> 32);
-
- lo += k;
- if (lo < k)
- hi++;
- *outHigh = hi;
- return lo;
-#endif
- }
-
- static const size_t kBitCount = 3328; // 64bit * 54 > 10^1000
- static const size_t kCapacity = kBitCount / sizeof(Type);
- static const size_t kTypeBit = sizeof(Type) * 8;
-
- Type digits_[kCapacity];
- size_t count_;
-};
-
-} // namespace internal
-RAPIDJSON_NAMESPACE_END
-
-#endif // RAPIDJSON_BIGINTEGER_H_
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 04:41:05 +0000