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