Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

2026-04-24 00:00:05 +08:00 · 2020-02-24 14:43:11 +03:00
parent 133b3756e6 86cc97e55f
commit 32f1555929
655 changed files with 146468 additions and 0 deletions
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+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program 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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef OPENVPN_COMMON_BINPREFIX_H
+#define OPENVPN_COMMON_BINPREFIX_H
+
+#include <algorithm>        // for std::min, std::max
+#include <cstring>          // for std::memset, std::memcpy
+#include <cstdint>          // for std::uint32_t, uint64_t
+
+#include <openvpn/common/socktypes.hpp> // for ntohl
+
+namespace openvpn {
+
+  // Return the binary prefix of a big-endian data buffer
+  // as a 32 or 64 bit type.
+
+  template <typename T>
+  inline T bin_prefix(const unsigned char *data)
+  {
+    static_assert(sizeof(T) == 4 || sizeof(T) == 8, "size inconsistency");
+    if (sizeof(T) == 8)
+      return (T(ntohl(*(uint32_t *)&data[0])) << 32) | T(ntohl(*(uint32_t *)&data[4]));
+    else // sizeof(T) == 4
+      return T(ntohl(*(uint32_t *)&data[0]));
+  }
+
+  template <typename T>
+  inline T bin_prefix(const unsigned char *data, const size_t len)
+  {
+    unsigned char d[sizeof(T)]
+#ifndef _MSC_VER
+      __attribute__((aligned(sizeof(T))))
+#endif
+      ;
+    const size_t l = std::min(len, sizeof(d));
+    std::memset(d, 0, sizeof(d));
+    std::memcpy(d + sizeof(d) - l, data, l);
+    return bin_prefix<T>(d);
+  }
+
+  template <typename T>
+  inline T bin_prefix_floor(const unsigned char *data, const size_t len, const T floor)
+  {
+    return std::max(bin_prefix<T>(data, len), floor);
+  }
+
+}
+#endif