| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "gpu/command_buffer/common/mailbox.h" |
| |
| #include <string.h> |
| |
| #include "base/logging.h" |
| #include "base/rand_util.h" |
| |
| namespace gpu { |
| |
| Mailbox::Mailbox() { |
| memset(name, 0, sizeof(name)); |
| } |
| |
| bool Mailbox::IsZero() const { |
| for (size_t i = 0; i < arraysize(name); ++i) { |
| if (name[i]) |
| return false; |
| } |
| return true; |
| } |
| |
| void Mailbox::SetZero() { |
| memset(name, 0, sizeof(name)); |
| } |
| |
| void Mailbox::SetName(const int8* n) { |
| DCHECK(IsZero() || !memcmp(name, n, sizeof(name))); |
| memcpy(name, n, sizeof(name)); |
| } |
| |
| Mailbox Mailbox::Generate() { |
| Mailbox result; |
| // Generates cryptographically-secure bytes. |
| base::RandBytes(result.name, sizeof(result.name)); |
| #if !defined(NDEBUG) |
| int8 value = 1; |
| for (size_t i = 1; i < sizeof(result.name); ++i) |
| value ^= result.name[i]; |
| result.name[0] = value; |
| #endif |
| return result; |
| } |
| |
| bool Mailbox::Verify() const { |
| #if !defined(NDEBUG) |
| int8 value = 1; |
| for (size_t i = 0; i < sizeof(name); ++i) |
| value ^= name[i]; |
| return value == 0; |
| #else |
| return true; |
| #endif |
| } |
| |
| } // namespace gpu |