mirror of
https://github.com/VCMP-SqMod/SqMod.git
synced 2024-11-14 03:37:16 +01:00
543 lines
19 KiB
C++
543 lines
19 KiB
C++
#ifndef _LIBRARY_UTILS_BUFFERINTERPRETER_HPP_
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#define _LIBRARY_UTILS_BUFFERINTERPRETER_HPP_
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// ------------------------------------------------------------------------------------------------
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#include "Base/Shared.hpp"
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#include "Base/Buffer.hpp"
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// ------------------------------------------------------------------------------------------------
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namespace SqMod {
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// ------------------------------------------------------------------------------------------------
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class BufferWrapper;
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/* ------------------------------------------------------------------------------------------------
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* Used internally to obtain a reference to the memory buffer without including the wrapper header.
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*/
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const SharedPtr< Buffer > & GetBufferBufferRef(const BufferWrapper & buffer);
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/* ------------------------------------------------------------------------------------------------
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* Utility class used to interpret a memory buffer in different ways.
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*/
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template < typename T > class BufferInterpreter
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{
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private:
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// --------------------------------------------------------------------------------------------
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typedef SharedPtr< Buffer > SRef; // Strong reference type to the interpreted memory buffer.
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typedef WeakPtr< Buffer > WRef; // Weak reference type to the interpreted memory buffer.
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// --------------------------------------------------------------------------------------------
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WRef m_Buffer; // The interpreted memory buffer.
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public:
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// --------------------------------------------------------------------------------------------
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typedef T Value; // The type of value used to represent a byte.
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// --------------------------------------------------------------------------------------------
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typedef Value & Reference; // A reference to the stored value type.
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typedef const Value & ConstRef; // A const reference to the stored value type.
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// --------------------------------------------------------------------------------------------
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typedef Value * Pointer; // A pointer to the stored value type.
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typedef const Value * ConstPtr; // A const pointer to the stored value type.
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// --------------------------------------------------------------------------------------------
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typedef Buffer::SzType SzType; // The type used to represent size in general.
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protected:
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/* --------------------------------------------------------------------------------------------
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* Attempt to obtain a strong reference to the memory buffer at all costs.
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*/
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SRef Validate() const
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{
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// Did the buffer that we reference expired?
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if (m_Buffer.Expired())
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{
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STHROWF("Invalid memory buffer reference");
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}
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// Obtain a strong reference to it
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return m_Buffer.Lock();
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}
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/* --------------------------------------------------------------------------------------------
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* Attempt to obtain a strong reference to a valid memory buffer at all costs.
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*/
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SRef ValidateDeeper() const
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{
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// Did the buffer that we reference expired?
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if (m_Buffer.Expired())
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{
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STHROWF("Invalid memory buffer reference");
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}
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// Obtain a strong reference to it
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SRef ref = m_Buffer.Lock();
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// Validate the buffer itself
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if (!(*ref))
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{
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STHROWF("Invalid memory buffer");
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}
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// Return the reference
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return ref;
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}
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public:
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/* --------------------------------------------------------------------------------------------
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* Default constructor. (null)
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*/
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BufferInterpreter()
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: m_Buffer()
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{
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/* ... */
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}
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/* --------------------------------------------------------------------------------------------
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* Base constructor.
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*/
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BufferInterpreter(const WRef & ref)
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: m_Buffer(ref)
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{
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/* ... */
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}
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/* --------------------------------------------------------------------------------------------
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* Base constructor.
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*/
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BufferInterpreter(const SRef & ref)
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: m_Buffer(ref)
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{
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/* ... */
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}
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/* --------------------------------------------------------------------------------------------
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* Copy constructor.
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*/
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BufferInterpreter(const BufferInterpreter & o) = default;
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/* --------------------------------------------------------------------------------------------
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* Move constructor.
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*/
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BufferInterpreter(BufferInterpreter && o) = default;
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/* --------------------------------------------------------------------------------------------
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* Destructor.
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*/
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~BufferInterpreter() = default;
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/* --------------------------------------------------------------------------------------------
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* Copy assignment operator.
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*/
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BufferInterpreter & operator = (const BufferInterpreter & o) = default;
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/* --------------------------------------------------------------------------------------------
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* Move assignment operator.
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*/
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BufferInterpreter & operator = (BufferInterpreter && o) = default;
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/* --------------------------------------------------------------------------------------------
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* Retrieve a reference to the managed memory buffer.
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*/
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const WRef & GetRef() const
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{
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return m_Buffer;
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}
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/* --------------------------------------------------------------------------------------------
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* Assign a different memory buffer to interpret from.
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*/
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void UseBuffer(const BufferWrapper & buffer)
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{
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m_Buffer = GetBufferBufferRef(buffer);
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve a certain element type at the specified position.
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*/
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T Get(SzType n) const
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (n >= b->Size< T >())
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{
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STHROWF("Index (%u) is out of bounds (%u)", n, b->Size< T >());
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}
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// Return the requested element
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return b->At< T >(n);
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}
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/* --------------------------------------------------------------------------------------------
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* Modify a certain element type at the specified position.
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*/
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void Set(SzType n, T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (n >= b->Size< T >())
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{
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STHROWF("Index (%u) is out of bounds (%u)", n, b->Size< T >());
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}
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// Return the requested element
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b->At< T >(n) = v;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the element at the front of the buffer.
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*/
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T GetFront() const
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < sizeof(T))
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{
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STHROWF("Value size (%u starting at 0) is out of bounds (%u)",
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sizeof(T), b->Capacity());
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}
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// Return the requested element
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return b->Front< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Modify the element at the front of the buffer.
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*/
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void SetFront(T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < sizeof(T))
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{
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STHROWF("Value size (%u starting at 0) is out of bounds (%u)",
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sizeof(T), b->Capacity());
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}
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// Return the requested element
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b->Front< T >() = v;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the element after the first element in the buffer.
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*/
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T GetNext() const
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < (sizeof(T) * 2))
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{
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STHROWF("Value size (%u starting at %u) is out of bounds (%u)",
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sizeof(T), sizeof(T), b->Capacity());
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}
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// Return the requested element
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return b->Next< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Modify the element after the first element in the buffer.
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*/
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void SetNext(T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < (sizeof(T) * 2))
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{
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STHROWF("Value size (%u starting at %u) is out of bounds (%u)",
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sizeof(T), sizeof(T), b->Capacity());
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}
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// Return the requested element
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b->Next< T >() = v;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the element at the back of the buffer.
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*/
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T GetBack() const
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < sizeof(T))
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{
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STHROWF("Value size (%u starting at 0) is out of bounds (%u)",
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sizeof(T), b->Capacity());
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}
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// Return the requested element
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return b->Back< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Modify the element at the back of the buffer.
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*/
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void SetBack(T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < sizeof(T))
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{
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STHROWF("Value size (%u starting at 0) is out of bounds (%u)",
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sizeof(T), b->Capacity());
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}
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// Return the requested element
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b->Back< T >() = v;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the element before the last element in the buffer.
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*/
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T GetPrev() const
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < (sizeof(T) * 2))
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{
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STHROWF("Value size (%u starting at %u) is out of bounds (%u)",
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sizeof(T), sizeof(T), b->Capacity());
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}
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// Return the requested element
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return b->Prev< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Modify the element before the last element in the buffer.
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*/
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void SetPrev(T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < (sizeof(T) * 2))
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{
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STHROWF("Value size (%u starting at %u) is out of bounds (%u)",
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sizeof(T), sizeof(T), b->Capacity());
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}
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// Return the requested element
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b->Prev< T >() = v;
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}
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/* --------------------------------------------------------------------------------------------
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* Reposition the edit cursor to the specified number of elements ahead.
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*/
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void Advance(SzType n)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Perform the requested operation
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b->Advance< T >(n);
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}
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/* --------------------------------------------------------------------------------------------
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* Reposition the edit cursor to the specified number of elements behind.
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*/
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void Retreat(SzType n)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Perform the requested operation
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b->Retreat< T >(n);
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}
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/* --------------------------------------------------------------------------------------------
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* Reposition the edit cursor to a fixed position within the buffer.
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*/
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void Move(SzType n)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Perform the requested operation
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b->Move< T >(n);
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}
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/* --------------------------------------------------------------------------------------------
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* Append a value to the current cursor location and advance the cursor.
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*/
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void Push(T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Perform the requested operation
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b->Push< T >(v);
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the element at the cursor position.
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*/
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T GetCursor() const
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Position< T >() >= b->Size< T >())
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{
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STHROWF("Value size (%u starting at %u) is out of bounds (%u)",
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sizeof(T), b->Position(), b->Capacity());
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}
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// Return the requested element
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return b->Cursor< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Modify the element at the cursor position.
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*/
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void SetCursor(T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Position< T >() >= b->Size< T >())
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{
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STHROWF("Value size (%u starting at %u) is out of bounds (%u)",
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sizeof(T), b->Position(), b->Capacity());
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}
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// Return the requested element
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b->Cursor< T >() = v;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the element before the cursor position.
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*/
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T GetBefore() const
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Position() < sizeof(T))
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{
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STHROWF("Value size (%u starting at 0) is out of bounds (%u)",
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sizeof(T), b->Capacity());
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}
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// Return the requested element
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return b->Before< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Modify the element before the cursor position.
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*/
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void SetBefore(T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Position() < sizeof(T))
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{
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STHROWF("Value size (%u starting at 0) is out of bounds (%u)",
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sizeof(T), b->Capacity());
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}
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// Return the requested element
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b->Before< T >() = v;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the element after the cursor position.
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*/
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T GetAfter() const
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < sizeof(T) || (b->Position() + sizeof(T)) > (b->Capacity() - sizeof(T)))
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{
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STHROWF("Value size (%u starting at %u) is out of bounds (%u)",
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sizeof(T), b->Position(), b->Capacity());
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}
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// Return the requested element
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return b->After< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Modify the element after the cursor position.
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*/
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void SetAfter(T v)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Are we out of the memory buffer range?
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if (b->Capacity() < sizeof(T) || (b->Position() + sizeof(T)) > (b->Capacity() - sizeof(T)))
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{
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STHROWF("Value size (%u starting at %u) is out of bounds (%u)",
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sizeof(T), b->Position(), b->Capacity());
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}
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// Return the requested element
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b->After< T >() = v;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve maximum elements it can hold for a certain type.
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*/
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SzType GetMax() const
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{
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return Buffer::Max< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the current buffer capacity in element count.
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*/
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SzType GetSize() const
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{
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return Validate()->template Size< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the current buffer capacity in byte count.
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*/
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SzType GetCapacity() const
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{
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return Validate()->Capacity();
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the current position of the cursor in the buffer.
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*/
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SzType GetPosition() const
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{
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return Validate()->template Position< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the amount of unused buffer after the edit cursor.
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*/
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SzType GetRemaining() const
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{
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return Validate()->template Remaining< T >();
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}
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/* --------------------------------------------------------------------------------------------
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* Grow the size of the internal buffer by the specified amount of bytes.
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*/
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void Grow(SzType n)
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{
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return Validate()->Grow(n * sizeof(T));
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}
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/* --------------------------------------------------------------------------------------------
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* Makes sure there is enough capacity to hold the specified element count.
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*/
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void Adjust(SzType n)
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{
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// Acquire a reference to the memory buffer
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SRef b(Validate());
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// Attempt to perform the requested operation
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try
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{
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Buffer bkp(b->Adjust(n * sizeof(T)));
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// Copy the data into the new buffer
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b->Write(0, bkp.Data(), bkp.Capacity());
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b->Move(bkp.Position());
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}
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catch (const std::exception & e)
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{
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STHROWF("%s", e.what()); // Re-package
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}
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}
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};
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} // Namespace:: SqMod
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#endif // _LIBRARY_UTILS_BUFFERINTERPRETER_HPP_
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