0,0 → 1,113 |
/* |
SDL - Simple DirectMedia Layer |
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga |
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This library is free software; you can redistribute it and/or |
modify it under the terms of the GNU Library General Public |
License as published by the Free Software Foundation; either |
version 2 of the License, or (at your option) any later version. |
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This library 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 |
Library General Public License for more details. |
|
You should have received a copy of the GNU Library General Public |
License along with this library; if not, write to the Free |
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
|
Sam Lantinga |
slouken@devolution.com |
*/ |
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#ifdef SAVE_RCSID |
static char rcsid = |
"@(#) $Id: SDL_rwops.h,v 1.2 2001/04/26 16:50:17 hercules Exp $"; |
#endif |
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/* This file provides a general interface for SDL to read and write |
data sources. It can easily be extended to files, memory, etc. |
*/ |
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#ifndef _SDL_RWops_h |
#define _SDL_RWops_h |
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#include <stdio.h> |
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#include "SDL_types.h" |
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#include "begin_code.h" |
/* Set up for C function definitions, even when using C++ */ |
#ifdef __cplusplus |
extern "C" { |
#endif |
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/* This is the read/write operation structure -- very basic */ |
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typedef struct SDL_RWops { |
/* Seek to 'offset' relative to whence, one of stdio's whence values: |
SEEK_SET, SEEK_CUR, SEEK_END |
Returns the final offset in the data source. |
*/ |
int (*seek)(struct SDL_RWops *context, int offset, int whence); |
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/* Read up to 'num' objects each of size 'objsize' from the data |
source to the area pointed at by 'ptr'. |
Returns the number of objects read, or -1 if the read failed. |
*/ |
int (*read)(struct SDL_RWops *context, void *ptr, int size, int maxnum); |
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/* Write exactly 'num' objects each of size 'objsize' from the area |
pointed at by 'ptr' to data source. |
Returns 'num', or -1 if the write failed. |
*/ |
int (*write)(struct SDL_RWops *context, const void *ptr, int size, int num); |
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/* Close and free an allocated SDL_FSops structure */ |
int (*close)(struct SDL_RWops *context); |
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Uint32 type; |
union { |
struct { |
int autoclose; |
FILE *fp; |
} stdio; |
struct { |
Uint8 *base; |
Uint8 *here; |
Uint8 *stop; |
} mem; |
struct { |
void *data1; |
} unknown; |
} hidden; |
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} SDL_RWops; |
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/* Functions to create SDL_RWops structures from various data sources */ |
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//extern DECLSPEC SDL_RWops * SDL_RWFromFile(const char *file, const char *mode); |
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extern DECLSPEC SDL_RWops * SDL_RWFromFP(FILE *fp, int autoclose); |
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extern DECLSPEC SDL_RWops * SDL_RWFromMem(void *mem, int size); |
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extern DECLSPEC SDL_RWops * SDL_AllocRW(void); |
extern DECLSPEC void SDL_FreeRW(SDL_RWops *area); |
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/* Macros to easily read and write from an SDL_RWops structure */ |
#define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence) |
#define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, SEEK_CUR) |
#define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n) |
#define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n) |
#define SDL_RWclose(ctx) (ctx)->close(ctx) |
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/* Ends C function definitions when using C++ */ |
#ifdef __cplusplus |
} |
#endif |
#include "close_code.h" |
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#endif /* _SDL_RWops_h */ |