packer.h

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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com.                */
#ifndef ENGINE_SHARED_PACKER_H
#define ENGINE_SHARED_PACKER_H
 
#include <cstddef>

class CAbstractPacker
{
private:
    unsigned char *const m_pBuffer;
    const size_t m_BufferSize;
    unsigned char *m_pCurrent;
    unsigned char *m_pEnd;
    bool m_Error;
 
protected:
    CAbstractPacker(unsigned char *pBuffer, size_t Size);
 
public:
    void Reset();
    void AddInt(int i);
    void AddString(const char *pStr, int Limit = 0, bool AllowTruncation = true);
    void AddRaw(const void *pData, int Size);
 
    int Size() const { return (int)(m_pCurrent - m_pBuffer); }
    const unsigned char *Data() const { return m_pBuffer; }
    bool Error() const { return m_Error; }
};

class CPacker : public CAbstractPacker
{
public:
    enum
    {
        PACKER_BUFFER_SIZE = 1024 * 2
    };
    CPacker() :
        CAbstractPacker(m_aBuffer, sizeof(m_aBuffer))
    {
    }
 
private:
    unsigned char m_aBuffer[PACKER_BUFFER_SIZE];
};
 
class CUnpacker
{
    const unsigned char *m_pStart;
    const unsigned char *m_pCurrent;
    const unsigned char *m_pEnd;
    bool m_Error;
 
public:
    enum
    {
        SANITIZE = 1,
        SANITIZE_CC = 2,
        SKIP_START_WHITESPACES = 4
    };
 
    void Reset(const void *pData, int Size);
    int GetInt();
    int GetIntOrDefault(int Default);
    int GetUncompressedInt();
    int GetUncompressedIntOrDefault(int Default);
    const char *GetString(int SanitizeType = SANITIZE);
    const unsigned char *GetRaw(int Size);
    bool Error() const { return m_Error; }
 
    int CompleteSize() const { return m_pEnd - m_pStart; }
    const unsigned char *CompleteData() const { return m_pStart; }
};
 
#endif