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// Copyright 2017 The Chromium OS 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 <base/macros.h>
namespace password_provider {
// Wrapper around a simple char* string. This class is used to handle allocating
// the memory so that it won't be available in a crash dump and won't be paged
// out to disk. Assumption is that this will be used to hold a user-typed
// password, so the max size will be (sizeof(1 page) - 1). The -1 is to reserve
// space for the null terminator that's added to the end when reading back the
// saved password.
// Note that the contents size will need to be set once the buffer has been
// written to.
class Password {
Password() = default;
// Returns the max size of the buffer.
size_t max_size() const { return max_size_; }
// Returns the size of the contents.
size_t size() const { return size_; }
// Creates an empty buffer. The buffer will have the appropriate protections
// against page swapping and dumping in core dumps.
bool Init();
// Mutable access to the raw memory. Error if the memory has not been
// initialized.
char* GetMutableRaw();
// Access to the raw memory. Error if the memory has not been initialized.
const char* GetRaw() const;
// Sets the size of the contents. The size should be the size of the string
// without the null terminator.
void SetSize(size_t size);
char* password_ = nullptr;
size_t buffer_alloc_size_ = 0;
size_t max_size_ = 0;
size_t size_ = 0;
} // namespace password_provider