dolphin/Externals/SDL/Include_1.3/SDL_rwops.h

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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
/**
* \file SDL_rwops.h
*
* 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 "SDL_stdinc.h"
#include "SDL_error.h"
#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#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:
RW_SEEK_SET, RW_SEEK_CUR, RW_SEEK_END
Returns the final offset in the data source.
*/
long (SDLCALL * seek) (struct SDL_RWops * context, long 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 0 at error or end of file.
*/
size_t(SDLCALL * read) (struct SDL_RWops * context, void *ptr,
size_t size, size_t maxnum);
/* Write exactly 'num' objects each of size 'objsize' from the area
pointed at by 'ptr' to data source.
Returns the number of objects written, or 0 at error or end of file.
*/
size_t(SDLCALL * write) (struct SDL_RWops * context, const void *ptr,
size_t size, size_t num);
/* Close and free an allocated SDL_RWops structure.
Returns 0 if successful or -1 on write error when flushing data.
*/
int (SDLCALL * close) (struct SDL_RWops * context);
Uint32 type;
union
{
#ifdef __WIN32__
struct
{
SDL_bool append;
void *h;
struct
{
void *data;
int size;
int left;
} buffer;
} win32io;
#endif
#ifdef HAVE_STDIO_H
struct
{
SDL_bool autoclose;
FILE *fp;
} stdio;
#endif
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);
#ifdef HAVE_STDIO_H
extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFP(FILE * fp,
SDL_bool autoclose);
#endif
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);
#define RW_SEEK_SET 0 /* Seek from the beginning of data */
#define RW_SEEK_CUR 1 /* Seek relative to current read point */
#define RW_SEEK_END 2 /* Seek relative to the end of data */
/* 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, RW_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)
/* Read an item of the specified endianness and return in native format */
extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops * src);
extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops * src);
extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops * src);
extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops * src);
extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops * src);
extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops * src);
/* Write an item of native format to the specified endianness */
extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops * dst, Uint16 value);
extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops * dst, Uint16 value);
extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops * dst, Uint32 value);
extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops * dst, Uint32 value);
extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops * dst, Uint64 value);
extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops * dst, Uint64 value);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"
#endif /* _SDL_rwops_h */
/* vi: set ts=4 sw=4 expandtab: */