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

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

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

#include "hsTypes.h"
//#include "hsTemplates.h"

class HSMemory {
public:
#if HS_BUILD_FOR_MAC
    static void BlockMove(const void* src, void* dst, UInt32 length);
#else
    static void BlockMove(const void* src, void* dst, UInt32 length);
#endif
    static void Clear(void *m, UInt32 byteLen);
    static void ClearMemory(void *m, UInt32 byteLen) { HSMemory::Clear(m, byteLen); }

    static hsBool   EqualBlocks(const void* block1, const void* block2, UInt32 length);

    static void*    New(UInt32 size);
    static void Delete(void* block);
    static void*    Copy(UInt32 length, const void* source);
    
    static void*    SoftNew(UInt32 size);   // returns nil if can't allocate
};

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

class hsAllocator {
public:
    virtual void*   Alloc(UInt32 size) = 0;
    virtual void    Free(void* addr) = 0;
};

class hsScratchMem {
    enum {
        kBufferSize = 32
    };
    UInt8*  fMem;
    UInt8   fMemBuffer[kBufferSize];
    UInt32  fLength;
public:
    hsScratchMem() : fLength(kBufferSize)
    {
        fMem = fMemBuffer;
    }
    ~hsScratchMem()
    {
        if (fMem != fMemBuffer)
            delete[] fMem;
    }
    UInt8* GetMem(UInt32 length)
    {
        if (length > fLength)
        {   if (fMem != fMemBuffer)
                delete[] fMem;
            fMem = TRACKED_NEW UInt8[length];
            fLength = length;
        }
        return fMem;
    }
};

class hsChunkAllocator {
    enum {
        kDefaultChunkSize = 4096
    };
    UInt32              fChunkSize;
    struct hsPrivateChunk*  fChunk;
    hsDebugCode(UInt32  fChunkCount;)
public:
            hsChunkAllocator(UInt32 chunkSize = kDefaultChunkSize);
            ~hsChunkAllocator();

    void        Reset();
    void        SetChunkSize(UInt32 size);
    void*   Allocate(UInt32 size, const void* data = nil);      // throws if fails
    void*   SoftAllocate(UInt32 size, const void* data = nil);  // returns nil if fails
};

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

class hsAppender {
    struct hsAppenderHead*  fFirstBlock, *fLastBlock;
    UInt32              fElemSize, fElemCount, fCount;
    
    friend class hsAppenderIterator;
public:
            hsAppender(UInt32 elemSize, UInt32 minCount = 16);
            ~hsAppender();

    UInt32  ElemSize() const { return fElemSize; }
    UInt32  Count() const { return fCount; }
    hsBool  IsEmpty() const { return fCount == 0; }
    void    Reset();

    UInt32  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;
    hsBool  PopHead(void* data = nil);
    int     PopHead(int count, void* data = nil);       // data[] = count * fElemSize
    hsBool  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); }
    hsBool  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); }
    hsBool  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();
    hsBool  Next(void* data);
    int     Next(int count, void* data);
    void*   Prev();
    hsBool  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 minCount) : hsAppender(sizeof(T), minCount) {}

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

    UInt32  Count() const { return hsAppender::Count(); }
    hsBool  IsEmpty() const { return hsAppender::IsEmpty(); }
    void    Reset() { hsAppender::Reset(); }

    UInt32  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(); }
    hsBool  PopHead(T* item = nil) { return hsAppender::PopHead(item); }
    int     PopHead(int count, T item[] = nil) { return hsAppender::PopHead(count, item); }
    hsBool  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); }
    hsBool  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); }
    hsBool  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(); }
    hsBool  Next(T* item) { return hsAppenderIterator::Next(item); }
    T*      Prev() { return (T*)hsAppenderIterator::Prev(); }
    hsBool  Prev(T* item) { return hsAppenderIterator::Prev(item); }

    //  Obsolete interfaces

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