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/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#pragma once
/// \file
/// Defines Diligent::StringPool class
#include <cstring>
#include "../../Primitives/interface/BasicTypes.h"
#include "../../Primitives/interface/MemoryAllocator.h"
#include "../../Platforms/Basic/interface/DebugUtilities.hpp"
namespace Diligent
{
/// Implementation of a simple fixed-size string pool
class StringPool
{
public:
StringPool() {}
// clang-format off
StringPool (const StringPool&) = delete;
StringPool& operator=(const StringPool&) = delete;
// clang-format on
StringPool(StringPool&& Pool) :
// clang-format off
m_pBuffer {Pool.m_pBuffer },
m_pCurrPtr {Pool.m_pCurrPtr },
m_ReservedSize{Pool.m_ReservedSize},
m_pAllocator {Pool.m_pAllocator }
// clang-format on
{
Pool.m_pBuffer = nullptr;
Pool.m_pCurrPtr = nullptr;
Pool.m_ReservedSize = 0;
Pool.m_pAllocator = nullptr;
}
~StringPool()
{
Clear();
}
void Reserve(size_t Size, IMemoryAllocator& Allocator)
{
Clear();
VERIFY(m_ReservedSize == 0, "Pool is already initialized");
m_pAllocator = &Allocator;
m_ReservedSize = Size;
if (m_ReservedSize != 0)
{
m_pBuffer = reinterpret_cast<Char*>(m_pAllocator->Allocate(m_ReservedSize, "Memory for string pool", __FILE__, __LINE__));
}
m_pCurrPtr = m_pBuffer;
}
void Clear()
{
if (m_pBuffer != nullptr && m_pAllocator != nullptr)
{
m_pAllocator->Free(m_pBuffer);
}
m_pBuffer = nullptr;
m_pCurrPtr = nullptr;
m_ReservedSize = 0;
m_pAllocator = nullptr;
}
static size_t GetRequiredReserveSize(const char* str)
{
return str != nullptr ? strlen(str) + 1 : 0;
}
static size_t GetRequiredReserveSize(const std::string& str)
{
return str.length() + 1;
}
void AssignMemory(Char* pBuffer, size_t Size)
{
VERIFY(m_ReservedSize == 0, "Pool is already initialized");
m_ReservedSize = Size;
m_pBuffer = pBuffer;
m_pCurrPtr = m_pBuffer;
}
Char* Allocate(size_t Length)
{
VERIFY(m_pCurrPtr + Length <= m_pBuffer + m_ReservedSize, "Not enough space in the buffer");
auto* Ptr = m_pCurrPtr;
m_pCurrPtr += Length;
return Ptr;
}
Char* CopyString(const String& Str)
{
auto len = Str.length();
auto* str = Allocate(len + 1);
if (len != 0)
{
memcpy(str, Str.data(), len * sizeof(str[0]));
}
str[len] = 0;
return str;
}
Char* CopyString(const char* Str)
{
if (Str == nullptr)
return nullptr;
auto* Ptr = m_pCurrPtr;
while (*Str != 0 && m_pCurrPtr < m_pBuffer + m_ReservedSize)
{
*(m_pCurrPtr++) = *(Str++);
}
if (m_pCurrPtr < m_pBuffer + m_ReservedSize)
*(m_pCurrPtr++) = 0;
else
UNEXPECTED("Not enough space reserved in the string pool");
return Ptr;
}
size_t GetRemainingSize() const
{
VERIFY(m_pCurrPtr <= m_pBuffer + m_ReservedSize, "Buffer overflow");
return m_ReservedSize - (m_pCurrPtr - m_pBuffer);
}
size_t GetUsedSize() const
{
VERIFY(m_pCurrPtr <= m_pBuffer + m_ReservedSize, "Buffer overflow");
return m_pCurrPtr - m_pBuffer;
}
size_t GetReservedSize() const
{
return m_ReservedSize;
}
private:
Char* m_pBuffer = nullptr;
Char* m_pCurrPtr = nullptr;
size_t m_ReservedSize = 0;
IMemoryAllocator* m_pAllocator = nullptr;
};
} // namespace Diligent
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