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tdutils/td/utils/UInt.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+
+#include "td/utils/common.h"
+#include "td/utils/Slice.h"
+
+#include <cstring>
+
+namespace td {
+
+template <size_t size>
+struct UInt {
+  static_assert(size % 8 == 0, "size should be divisible by 8");
+  uint8 raw[size / 8];
+
+  Slice as_slice() const {
+    return Slice(raw, size / 8);
+  }
+
+  MutableSlice as_slice() {
+    return MutableSlice(raw, size / 8);
+  }
+
+  bool is_zero() const {
+    for (size_t i = 0; i < size / 8; i++) {
+      if (raw[i] != 0) {
+        return false;
+      }
+    }
+    return true;
+  }
+  void set_zero() {
+    for (size_t i = 0; i < size / 8; i++) {
+      raw[i] = 0;
+    }
+  }
+  static UInt zero() {
+    UInt v;
+    v.set_zero();
+    return v;
+  }
+};
+
+template <size_t size>
+bool operator==(const UInt<size> &a, const UInt<size> &b) {
+  return a.as_slice() == b.as_slice();
+}
+
+template <size_t size>
+bool operator!=(const UInt<size> &a, const UInt<size> &b) {
+  return !(a == b);
+}
+
+template <size_t size>
+td::UInt<size> operator^(const UInt<size> &a, const UInt<size> &b) {
+  td::UInt<size> res;
+  for (size_t i = 0; i < size / 8; i++) {
+    res.raw[i] = static_cast<uint8>(a.raw[i] ^ b.raw[i]);
+  }
+  return res;
+}
+
+template <size_t size>
+int get_kth_bit(const UInt<size> &a, uint32 bit) {
+  uint8 b = a.raw[bit / 8];
+  bit &= 7;
+  return (b >> (7 - bit)) & 1;
+}
+
+template <size_t size>
+Slice as_slice(const UInt<size> &value) {
+  return value.as_slice();
+}
+
+template <size_t size>
+MutableSlice as_slice(UInt<size> &value) {
+  return value.as_slice();
+}
+
+template <size_t size>
+bool operator<(const UInt<size> &a, const UInt<size> &b) {
+  return a.as_slice() < b.as_slice();
+}
+
+using UInt128 = UInt<128>;
+using UInt256 = UInt<256>;
+
+}  // namespace td