| 0,0 → 1,114 |
|---|
| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2004 Sam Lantinga |
| |
| 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. |
| |
| 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@libsdl.org |
| */ |
| |
| #ifdef SAVE_RCSID |
| static char rcsid = |
| "@(#) $Id: SDL_rwops.h,v 1.7 2004/01/04 16:49:07 slouken Exp $"; |
| #endif |
| |
| /* This file provides a general interface for SDL to read and write |
| data sources. It can easily be extended to files, memory, etc. |
| */ |
| |
| #ifndef _SDL_RWops_h |
| #define _SDL_RWops_h |
| |
| #include <stdio.h> |
| |
| #include "SDL_types.h" |
| |
| #include "begin_code.h" |
| /* Set up for C function definitions, even when using C++ */ |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* This is the read/write operation structure -- very basic */ |
| |
| 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); |
| |
| /* 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); |
| |
| /* 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); |
| |
| /* Close and free an allocated SDL_FSops structure */ |
| int (*close)(struct SDL_RWops *context); |
| |
| Uint32 type; |
| union { |
| struct { |
| int autoclose; |
| FILE *fp; |
| } stdio; |
| struct { |
| Uint8 *base; |
| Uint8 *here; |
| Uint8 *stop; |
| } mem; |
| struct { |
| void *data1; |
| } unknown; |
| } hidden; |
| |
| } SDL_RWops; |
| |
| |
| /* Functions to create SDL_RWops structures from various data sources */ |
| |
| extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFile(const char *file, const char *mode); |
| |
| extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFP(FILE *fp, int autoclose); |
| |
| extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromMem(void *mem, int size); |
| extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromConstMem(const void *mem, int size); |
| |
| extern DECLSPEC SDL_RWops * SDLCALL SDL_AllocRW(void); |
| extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops *area); |
| |
| /* 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) |
| |
| |
| /* Ends C function definitions when using C++ */ |
| #ifdef __cplusplus |
| } |
| #endif |
| #include "close_code.h" |
| |
| #endif /* _SDL_RWops_h */ |