misc.h

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// Copyright (C) 1999-2003 Open Source Telecom Corporation.
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
// As a special exception to the GNU General Public License, permission is 
// granted for additional uses of the text contained in its release 
// of Common C++.
// 
// The exception is that, if you link the Common C++ library with other
// files to produce an executable, this does not by itself cause the
// resulting executable to be covered by the GNU General Public License.
// Your use of that executable is in no way restricted on account of
// linking the Common C++ library code into it.
//
// This exception does not however invalidate any other reasons why
// the executable file might be covered by the GNU General Public License.
// 
// This exception applies only to the code released under the 
// name Common C++.  If you copy code from other releases into a copy of
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
// 
// If you write modifications of your own for Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.

#ifndef CCXX_MISC_H_
#define CCXX_MISC_H_

#ifndef CCXX_MISSING_H_
#include <cc++/missing.h>
#endif

#ifndef CCXX_THREAD_H_
#include <cc++/thread.h>
#endif

#define KEYDATA_INDEX_SIZE      97
#define KEYDATA_PAGER_SIZE      512

#if defined(PATH_MAX)
#if PATH_MAX > 512
#define KEYDATA_PATH_SIZE       512
#else
#define KEYDATA_PATH_SIZE       PATH_MAX
#endif
#else
#define KEYDATA_PATH_SIZE       256
#endif

#ifdef  CCXX_NAMESPACES
namespace ost {
#endif

class __EXPORT MemPager
{
private:
        friend class String;
        friend class MemPagerObject;

        size_t pagesize;
        unsigned int pages;

        struct _page
        {
                struct _page *next;
                size_t used;
        } *page;

protected:
        virtual void* first(size_t size);

        virtual void* alloc(size_t size);

        char* first(char *str);

        char* alloc(const char *str);

        MemPager(size_t pagesize = 4096);

        void purge(void);

        virtual ~MemPager();

public:
        inline int getPages(void)
                {return pages;};
};

class __EXPORT StackPager : protected MemPager
{
private:
        typedef struct frame
        {
                struct frame *next;
                char data[1];
        }       frame_t;

        frame_t *stack;

public:
        StackPager(size_t pagesize);

        void *push(const void *object, size_t len);

        void *push(const char *string);

        void *pull(void);

        void purge(void);
};

class __EXPORT SharedMemPager : public MemPager, public Mutex
{
protected:
        SharedMemPager(size_t pagesize = 4096, const char *name = NULL);

        void purge(void);

        void* first(size_t size);

        void* alloc(size_t size);
};

class __EXPORT Keydata : protected MemPager
{
public:
#if defined(__GNUC__) || !defined(__hpux)
#pragma pack(1)
#endif

        struct Keyval
        {
                Keyval *next;
                char val[1];
        };

        struct Keysym
        {
                Keysym *next;
                Keyval *data;
                const char **list;
                short count;
                char sym[1];
        };

        struct Define
        {
                char *keyword;
                char *value;
        };

#if defined(__GNUC__) || !defined(__hpux)
#pragma pack()
#endif

private:
        static std::ifstream *cfgFile;
        static char lastpath[KEYDATA_PATH_SIZE + 1];
        static int count;
        static int sequence;

        int link;

        Keysym *keys[KEYDATA_INDEX_SIZE];

        unsigned getIndex(const char *sym);

protected:
        Keysym* getSymbol(const char *sym, bool create);

public:
        void load(const char *keypath, 
                  const char *environment = "CONFIG_KEYDATA");

        void loadPrefix(const char *prefix,
                  const char *keypath, const char *environment = "CONFIG_KEYDATA");

        void loadFile(const char *filepath, const char *keys = NULL, const char *pre = NULL);

        void load(Define *pairs);
        
        Keydata();

        Keydata(const char *keypath, const char *environment="CONFIG_KEYDATA");

        virtual ~Keydata();

        void unlink(void);

        int getCount(const char *sym);

        const char* getFirst(const char *sym);

        const char* getLast(const char *sym);

        unsigned getIndex(char **data, unsigned max);

        unsigned getCount(void);

        void setValue(const char *sym, const char *data);

        const char * const* getList(const char *sym);

        void clrValue(const char *sym);

        inline const char *operator[](const char *keyword)
                {return getLast(keyword);};

        static void end(void);

        friend inline void endKeydata(void)
                {Keydata::end();};
};

class __EXPORT MemPagerObject
{
public:
        inline void *operator new(size_t size, MemPager &pager)
                {return pager.alloc(size);};

        inline void *operator new[](size_t size, MemPager &pager)
                {return pager.alloc(size);};

        inline void operator delete(void *) {};

        inline void operator delete[](void *) {};
};

#ifdef  CCXX_NAMESPACES
}
#endif

#endif

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