assimp/include/aiFileIO.h

/*
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Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

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  following disclaimer.

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*/

/** @file aiFileIO.h
 *  @brief Defines generic routines to access memory-mapped files
 */

#ifndef AI_FILEIO_H_INC
#define AI_FILEIO_H_INC

#include "aiTypes.h"

#ifdef __cplusplus
extern "C" {
#endif

struct aiFileIO;
struct aiFile;

// aiFile callbacks
typedef size_t   (*aiFileWriteProc) (C_STRUCT aiFile*,   const char*, size_t, size_t);
typedef size_t   (*aiFileReadProc)  (C_STRUCT aiFile*,   char*, size_t,size_t);
typedef size_t   (*aiFileTellProc)  (C_STRUCT aiFile*);
typedef void     (*aiFileFlushProc) (C_STRUCT aiFile*);
typedef aiReturn (*aiFileSeek)(aiFile*, size_t, aiOrigin);

// aiFileIO callbackss
typedef aiFile* (*aiFileOpenProc)  (C_STRUCT aiFileIO*, const char*, const char*);
typedef void    (*aiFileCloseProc) (C_STRUCT aiFileIO*, C_STRUCT aiFile*);

// represents user-defined data
typedef char* aiUserData;

// ----------------------------------------------------------------------------------
/** @class aiFileIO
 *  @brief Defines Assimp's way of accessing files.
 *
 *  Provided are functions to open and close files. Supply a custom structure to
 *  the import function. If you don't, a default implementation is used. Use this
 *  to enable reading from other sources, such as ZIPs or memory locations.
*/
struct aiFileIO
{
	//! Function used to open a new file
	aiFileOpenProc OpenProc;

	//! Function used to close an existing file
	aiFileCloseProc CloseProc;

	//! User-defined data
	aiUserData UserData;
};

// ----------------------------------------------------------------------------------
/** @class aiFile
 *  @brief Represents a read/write file
 *
 *  Actually, it is a data structure to wrap a set of fXXXX (e.g fopen) 
 *  replacement functions
 *
 *  The default implementation of the functions utilizes the fXXX functions from 
 *  the CRT. However, you can supply a custom implementation to Assimp by
 *  also supplying a custom aiFileIO. Use this to enable reading from other sources, 
 *  such as ZIPs or memory locations.
 */
struct aiFile
{
	//! Function used to read from a file
	aiFileReadProc ReadProc;

	//! Function used to write to a file
	aiFileWriteProc WriteProc;

	//! Function used to retrieve the current
	//! position of the file cursor (ftell())
	aiFileTellProc TellProc;

	//! Function used to retrieve the size of the file, in bytes
	aiFileTellProc FileSizeProc;

	//! Function used to set the current position
	//! of the file cursor (fseek())
	aiFileSeek SeekProc;

	//! Function used to flush the file contents
	aiFileFlushProc FlushProc;

	//! User-defined data
	aiUserData UserData;
};


#ifdef __cplusplus
}
#endif


#endif // AI_FILEIO_H_INC