CWE-ou-minkata/Sources/Plasma/CoreLib/hsMemory.h

/*==LICENSE==*

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*==LICENSE==*/
#ifndef hsMemoryDefined
#define hsMemoryDefined

#include "HeadSpin.h"
//#include "hsTemplates.h"

class HSMemory {
public:
    static void BlockMove(const void* src, void* dst, uint32_t length);
    static void Clear(void *m, uint32_t byteLen);
    static void ClearMemory(void *m, uint32_t byteLen) { HSMemory::Clear(m, byteLen); }

    static bool EqualBlocks(const void* block1, const void* block2, uint32_t length);

    static void* New(uint32_t size);
    static void  Delete(void* block);
    static void* Copy(uint32_t length, const void* source);
};

///////////////////////////////////////////////////////////////////////////////////////////

class hsAllocator {
public:
    virtual void*   Alloc(uint32_t size) = 0;
    virtual void    Free(void* addr) = 0;
};

class hsScratchMem {
    enum {
        kBufferSize = 32
    };
    uint8_t*  fMem;
    uint8_t   fMemBuffer[kBufferSize];
    uint32_t  fLength;
public:
    hsScratchMem() : fLength(kBufferSize)
    {
        fMem = fMemBuffer;
    }
    ~hsScratchMem()
    {
        if (fMem != fMemBuffer)
            delete[] fMem;
    }
    uint8_t* GetMem(uint32_t length)
    {
        if (length > fLength)
        {   if (fMem != fMemBuffer)
                delete[] fMem;
            fMem = new uint8_t[length];
            fLength = length;
        }
        return fMem;
    }
};

class hsChunkAllocator {
    enum {
        kDefaultChunkSize = 4096
    };
    uint32_t              fChunkSize;
    struct hsPrivateChunk*  fChunk;
    hsDebugCode(uint32_t  fChunkCount;)
public:
            hsChunkAllocator(uint32_t chunkSize = kDefaultChunkSize);
            ~hsChunkAllocator();

    void        Reset();
    void        SetChunkSize(uint32_t size);
    void*   Allocate(uint32_t size, const void* data = nil);
};

///////////////////////////////////////////////////////////////////////////////////////////

class hsAppender {
    struct hsAppenderHead*  fFirstBlock, *fLastBlock;
    uint32_t              fElemSize, fElemCount, fCount;
    
    friend class hsAppenderIterator;
public:
            hsAppender(uint32_t elemSize, uint32_t minCount = 16);
            ~hsAppender();

    uint32_t  ElemSize() const { return fElemSize; }
    uint32_t  Count() const { return fCount; }
    bool      IsEmpty() const { return fCount == 0; }
    void      Reset();

    uint32_t  CopyInto(void* data = nil) const;   // return size of data array in bytes

    void*     PushHead();
    void      PushHead(const void* data);
    void*     PushTail();
    void      PushTail(const void* data);
    void      PushTail(int count, const void* data);  // data[] = count * fElemSize
    void*     PeekHead() const;
    void*     PeekTail() const;
    bool      PopHead(void* data = nil);
    int       PopHead(int count, void* data = nil);       // data[] = count * fElemSize
    bool      PopTail(void* data = nil);

    //  Alternate interfaces

    void*   Prepend() { return this->PushHead(); }
    void*   Append() { return this->PushTail(); }

    void*   Push() { return this->PushHead(); }
    void    Push(const void* data) { this->PushHead(data); }
    bool    Pop(void* data = nil) { return this->PopHead(data); }

    void*   Enqueue() { return this->PushTail(); };
    void    Enqueue(const void* data) { this->PushTail(data); }
    void    Enqueue(int count, const void* data) { this->PushTail(count, data); }
    bool    Dequeue(void* data = nil) { return this->PopHead(data); }
    int     Dequeue(int count, void* data = nil) { return this->PopHead(count, data); }
};

class hsAppenderIterator {
    const hsAppender*           fAppender;
    const struct hsAppenderHead*    fCurrBlock;
    void*                   fCurrItem;
public:
            hsAppenderIterator(const hsAppender* list = nil);
            
    void    ResetToHead(const hsAppender* list = nil);
    void    ResetToTail(const hsAppender* list = nil);
    void*   Next();
    bool    Next(void* data);
    int     Next(int count, void* data);
    void*   Prev();
    bool    Prev(void* data);

    //  Obsolete interface

    void    Reset(const hsAppender* list = nil) { this->ResetToHead(list); }
};

///////////////////////////////////////////////////////////////////////////////

template <class T> class hsTAppender : hsAppender {
public:
            hsTAppender() : hsAppender(sizeof(T)) {}
            hsTAppender(uint32_t minCount) : hsAppender(sizeof(T), minCount) {}

    hsAppender*     GetAppender() { return this; }
    const hsAppender*   GetAppender() const { return this; }

    uint32_t  Count() const { return hsAppender::Count(); }
    bool      IsEmpty() const { return hsAppender::IsEmpty(); }
    void      Reset() { hsAppender::Reset(); }

    uint32_t  CopyInto(T copy[]) const { return hsAppender::CopyInto(copy); }

    T*      PushHead() { return (T*)hsAppender::PushHead(); }
    void    PushHead(const T& item) { *this->PushHead() = item; }
    T*      PushTail() { return (T*)hsAppender::PushTail(); }
    void    PushTail(const T& item) { *this->PushTail() = item; };
    void    PushTail(int count, const T item[]) { this->hsAppender::PushTail(count, item); };
    T*      PeekHead() const { return (T*)hsAppender::PeekHead(); }
    T*      PeekTail() const { return (T*)hsAppender::PeekTail(); }
    bool    PopHead(T* item = nil) { return hsAppender::PopHead(item); }
    int     PopHead(int count, T item[] = nil) { return hsAppender::PopHead(count, item); }
    bool    PopTail(T* item = nil) { return hsAppender::PopTail(item); }

    //  Alternate intefaces

    T*      Prepend() { return this->PushHead(); }
    T*      Append() { return this->PushTail(); }
    void    PrependItem(const T& item) { this->PushHead(item); }
    void    AppendItem(const T& item) { this->PushTail(item); }

    T*      Push() { return this->PushHead(); }
    void    Push(const T& item) { this->PushHead(item); }
    bool    Pop(T* item = nil) { return this->PopHead(item); }

    T*      Enqueue() { return this->PushTail(); };
    void    Enqueue(const T& item) { this->PushTail(item); }
    void    Enqueue(int count, const T item[]) { this->PushTail(count, item); }
    bool    Dequeue(T* item = nil) { return this->PopHead(item); }
    int     Dequeue(int count, T item[] = nil) { return this->PopHead(count, item); }
};

template <class T> class hsTAppenderIterator : hsAppenderIterator {
public:
            hsTAppenderIterator() : hsAppenderIterator() {}
            hsTAppenderIterator(const hsTAppender<T>* list) : hsAppenderIterator(list->GetAppender()) {}

    void    ResetToHead() { hsAppenderIterator::ResetToHead(nil); }
    void    ResetToHead(const hsTAppender<T>* list) { hsAppenderIterator::ResetToHead(list->GetAppender()); }
    void    ResetToTail() { hsAppenderIterator::ResetToTail(nil); }
    void    ResetToTail(const hsTAppender<T>* list) { hsAppenderIterator::ResetToTail(list->GetAppender()); }
    T*      Next() { return (T*)hsAppenderIterator::Next(); }
    int     Next(T* item) { return hsAppenderIterator::Next(item); }
    T*      Prev() { return (T*)hsAppenderIterator::Prev(); }
    bool  Prev(T* item) { return hsAppenderIterator::Prev(item); }

    //  Obsolete interfaces

    void    Reset() { this->ResetToHead(); }
    void    Reset(const hsTAppender<T>* list) { this->ResetToHead(list); }
};
#endif