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281be63d00
This uses “static” at function scope to avoid making local copies, even in cases where the compiler can’t see that the local copy is unnecessary. “constexpr” adds additional safety in that it prevents global state from being initialized from any runtime dependencies, which would be undesirable. At namespace scope, “constexpr” is also used where appropriate. For the most part, this was a mechanical transformation for things matching '(^| )const [^=]*\['. Similar transformations could be applied to non-arrays in some cases, but there’s limited practical impact in most non-array cases relative to arrays, there are far more use sites, and much more manual intervention would be required. Change-Id: I3513b739ee8b0be026f8285475cddc5f9cc81152 Reviewed-on: https://chromium-review.googlesource.com/583997 Commit-Queue: Mark Mentovai <mark@chromium.org> Reviewed-by: Leonard Mosescu <mosescu@chromium.org>
148 lines
4.3 KiB
C++
148 lines
4.3 KiB
C++
// Copyright 2014 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#if !defined(__STDC_FORMAT_MACROS)
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#define __STDC_FORMAT_MACROS
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#endif
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#include "util/misc/uuid.h"
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#include <inttypes.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include "base/logging.h"
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#include "base/rand_util.h"
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#include "base/strings/stringprintf.h"
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#include "base/strings/utf_string_conversions.h"
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#include "base/sys_byteorder.h"
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#include "util/stdlib/cxx.h"
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#if defined(OS_MACOSX)
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#include <uuid/uuid.h>
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#endif // OS_MACOSX
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#if CXX_LIBRARY_VERSION >= 2011
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#include <type_traits>
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#endif
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namespace crashpad {
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static_assert(sizeof(UUID) == 16, "UUID must be 16 bytes");
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#if CXX_LIBRARY_VERSION >= 2011
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static_assert(std::is_pod<UUID>::value, "UUID must be POD");
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#endif
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bool UUID::operator==(const UUID& that) const {
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return memcmp(this, &that, sizeof(*this)) == 0;
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}
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void UUID::InitializeToZero() {
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memset(this, 0, sizeof(*this));
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}
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void UUID::InitializeFromBytes(const uint8_t* bytes) {
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memcpy(this, bytes, sizeof(*this));
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data_1 = base::NetToHost32(data_1);
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data_2 = base::NetToHost16(data_2);
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data_3 = base::NetToHost16(data_3);
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}
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bool UUID::InitializeFromString(const base::StringPiece& string) {
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if (string.length() != 36)
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return false;
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UUID temp;
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static constexpr char kScanFormat[] =
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"%08" SCNx32 "-%04" SCNx16 "-%04" SCNx16
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"-%02" SCNx8 "%02" SCNx8
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"-%02" SCNx8 "%02" SCNx8 "%02" SCNx8 "%02" SCNx8 "%02" SCNx8 "%02" SCNx8;
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int rv = sscanf(string.data(),
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kScanFormat,
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&temp.data_1,
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&temp.data_2,
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&temp.data_3,
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&temp.data_4[0],
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&temp.data_4[1],
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&temp.data_5[0],
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&temp.data_5[1],
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&temp.data_5[2],
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&temp.data_5[3],
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&temp.data_5[4],
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&temp.data_5[5]);
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if (rv != 11)
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return false;
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*this = temp;
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return true;
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}
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bool UUID::InitializeWithNew() {
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#if defined(OS_MACOSX)
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uuid_t uuid;
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uuid_generate(uuid);
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InitializeFromBytes(uuid);
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return true;
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#elif defined(OS_WIN) || defined(OS_LINUX) || defined(OS_ANDROID)
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// Linux does not provide a UUID generator in a widely-available system
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// library. uuid_generate() from libuuid is not available everywhere.
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// On Windows, do not use UuidCreate() to avoid a dependency on rpcrt4, so
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// that this function is usable early in DllMain().
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base::RandBytes(this, sizeof(*this));
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// Set six bits per RFC 4122 §4.4 to identify this as a pseudo-random UUID.
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data_3 = (4 << 12) | (data_3 & 0x0fff); // §4.1.3
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data_4[0] = 0x80 | (data_4[0] & 0x3f); // §4.1.1
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return true;
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#else
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#error Port.
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#endif // OS_MACOSX
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}
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#if defined(OS_WIN)
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void UUID::InitializeFromSystemUUID(const ::UUID* system_uuid) {
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static_assert(sizeof(::UUID) == sizeof(UUID),
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"unexpected system uuid size");
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static_assert(offsetof(::UUID, Data1) == offsetof(UUID, data_1),
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"unexpected system uuid layout");
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memcpy(this, system_uuid, sizeof(*this));
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}
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#endif // OS_WIN
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std::string UUID::ToString() const {
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return base::StringPrintf("%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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data_1,
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data_2,
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data_3,
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data_4[0],
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data_4[1],
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data_5[0],
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data_5[1],
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data_5[2],
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data_5[3],
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data_5[4],
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data_5[5]);
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}
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#if defined(OS_WIN)
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base::string16 UUID::ToString16() const {
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return base::UTF8ToUTF16(ToString());
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}
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#endif // OS_WIN
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} // namespace crashpad
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