412 lines
13 KiB
C
Executable file
412 lines
13 KiB
C
Executable file
/*
|
|
Simple DirectMedia Layer
|
|
Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
/**
|
|
* \file SDL_rwops.h
|
|
*
|
|
* This file provides a general interface for SDL to read and write
|
|
* data streams. 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
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* RWops Types */
|
|
#define SDL_RWOPS_UNKNOWN 0U /**< Unknown stream type */
|
|
#define SDL_RWOPS_WINFILE 1U /**< Win32 file */
|
|
#define SDL_RWOPS_STDFILE 2U /**< Stdio file */
|
|
#define SDL_RWOPS_JNIFILE 3U /**< Android asset */
|
|
#define SDL_RWOPS_MEMORY 4U /**< Memory stream */
|
|
#define SDL_RWOPS_MEMORY_RO 5U /**< Read-Only memory stream */
|
|
#if defined(__VITA__)
|
|
#define SDL_RWOPS_VITAFILE 6U /**< Vita file */
|
|
#endif
|
|
|
|
/**
|
|
* This is the read/write operation structure -- very basic.
|
|
*/
|
|
typedef struct SDL_RWops
|
|
{
|
|
/**
|
|
* Return the size of the file in this rwops, or -1 if unknown
|
|
*/
|
|
Sint64 (SDLCALL * size) (struct SDL_RWops * context);
|
|
|
|
/**
|
|
* Seek to \c offset relative to \c whence, one of stdio's whence values:
|
|
* RW_SEEK_SET, RW_SEEK_CUR, RW_SEEK_END
|
|
*
|
|
* \return the final offset in the data stream, or -1 on error.
|
|
*/
|
|
Sint64 (SDLCALL * seek) (struct SDL_RWops * context, Sint64 offset,
|
|
int whence);
|
|
|
|
/**
|
|
* Read up to \c maxnum objects each of size \c size from the data
|
|
* stream to the area pointed at by \c ptr.
|
|
*
|
|
* \return 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 \c num objects each of size \c size from the area
|
|
* pointed at by \c ptr to data stream.
|
|
*
|
|
* \return 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.
|
|
*
|
|
* \return 0 if successful or -1 on write error when flushing data.
|
|
*/
|
|
int (SDLCALL * close) (struct SDL_RWops * context);
|
|
|
|
Uint32 type;
|
|
union
|
|
{
|
|
#if defined(__ANDROID__)
|
|
struct
|
|
{
|
|
void *asset;
|
|
} androidio;
|
|
#elif defined(__WIN32__)
|
|
struct
|
|
{
|
|
SDL_bool append;
|
|
void *h;
|
|
struct
|
|
{
|
|
void *data;
|
|
size_t size;
|
|
size_t left;
|
|
} buffer;
|
|
} windowsio;
|
|
#elif defined(__VITA__)
|
|
struct
|
|
{
|
|
int h;
|
|
struct
|
|
{
|
|
void *data;
|
|
size_t size;
|
|
size_t left;
|
|
} buffer;
|
|
} vitaio;
|
|
#endif
|
|
|
|
#ifdef HAVE_STDIO_H
|
|
struct
|
|
{
|
|
SDL_bool autoclose;
|
|
FILE *fp;
|
|
} stdio;
|
|
#endif
|
|
struct
|
|
{
|
|
Uint8 *base;
|
|
Uint8 *here;
|
|
Uint8 *stop;
|
|
} mem;
|
|
struct
|
|
{
|
|
void *data1;
|
|
void *data2;
|
|
} unknown;
|
|
} hidden;
|
|
|
|
} SDL_RWops;
|
|
|
|
|
|
/**
|
|
* \name RWFrom functions
|
|
*
|
|
* Functions to create SDL_RWops structures from various data streams.
|
|
*/
|
|
/* @{ */
|
|
|
|
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);
|
|
#else
|
|
extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFP(void * 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);
|
|
|
|
/* @} *//* RWFrom functions */
|
|
|
|
|
|
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 */
|
|
|
|
/**
|
|
* Use this macro to get the size of the data stream in an SDL_RWops.
|
|
*
|
|
* \param context the SDL_RWops to get the size of the data stream from
|
|
* \returns the size of the data stream in the SDL_RWops on success, -1 if
|
|
* unknown or a negative error code on failure; call SDL_GetError()
|
|
* for more information.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*/
|
|
extern DECLSPEC Sint64 SDLCALL SDL_RWsize(SDL_RWops *context);
|
|
|
|
/**
|
|
* Seek within an SDL_RWops data stream.
|
|
*
|
|
* This function seeks to byte `offset`, relative to `whence`.
|
|
*
|
|
* `whence` may be any of the following values:
|
|
*
|
|
* - `RW_SEEK_SET`: seek from the beginning of data
|
|
* - `RW_SEEK_CUR`: seek relative to current read point
|
|
* - `RW_SEEK_END`: seek relative to the end of data
|
|
*
|
|
* If this stream can not seek, it will return -1.
|
|
*
|
|
* SDL_RWseek() is actually a wrapper function that calls the SDL_RWops's
|
|
* `seek` method appropriately, to simplify application development.
|
|
*
|
|
* \param context a pointer to an SDL_RWops structure
|
|
* \param offset an offset in bytes, relative to **whence** location; can be
|
|
* negative
|
|
* \param whence any of `RW_SEEK_SET`, `RW_SEEK_CUR`, `RW_SEEK_END`
|
|
* \returns the final offset in the data stream after the seek or -1 on error.
|
|
*
|
|
* \sa SDL_RWclose
|
|
* \sa SDL_RWFromConstMem
|
|
* \sa SDL_RWFromFile
|
|
* \sa SDL_RWFromFP
|
|
* \sa SDL_RWFromMem
|
|
* \sa SDL_RWread
|
|
* \sa SDL_RWtell
|
|
* \sa SDL_RWwrite
|
|
*/
|
|
extern DECLSPEC Sint64 SDLCALL SDL_RWseek(SDL_RWops *context,
|
|
Sint64 offset, int whence);
|
|
|
|
/**
|
|
* Determine the current read/write offset in an SDL_RWops data stream.
|
|
*
|
|
* SDL_RWtell is actually a wrapper function that calls the SDL_RWops's
|
|
* `seek` method, with an offset of 0 bytes from `RW_SEEK_CUR`, to simplify
|
|
* application development.
|
|
*
|
|
* \param context a SDL_RWops data stream object from which to get the current
|
|
* offset
|
|
* \returns the current offset in the stream, or -1 if the information can not
|
|
* be determined.
|
|
*
|
|
* \sa SDL_RWclose
|
|
* \sa SDL_RWFromConstMem
|
|
* \sa SDL_RWFromFile
|
|
* \sa SDL_RWFromFP
|
|
* \sa SDL_RWFromMem
|
|
* \sa SDL_RWread
|
|
* \sa SDL_RWseek
|
|
* \sa SDL_RWwrite
|
|
*/
|
|
extern DECLSPEC Sint64 SDLCALL SDL_RWtell(SDL_RWops *context);
|
|
|
|
/**
|
|
* Read from a data source.
|
|
*
|
|
* This function reads up to `maxnum` objects each of size `size` from the
|
|
* data source to the area pointed at by `ptr`. This function may read less
|
|
* objects than requested. It will return zero when there has been an error or
|
|
* the data stream is completely read.
|
|
*
|
|
* SDL_RWread() is actually a function wrapper that calls the SDL_RWops's
|
|
* `read` method appropriately, to simplify application development.
|
|
*
|
|
* \param context a pointer to an SDL_RWops structure
|
|
* \param ptr a pointer to a buffer to read data into
|
|
* \param size the size of each object to read, in bytes
|
|
* \param maxnum the maximum number of objects to be read
|
|
* \returns the number of objects read, or 0 at error or end of file; call
|
|
* SDL_GetError() for more information.
|
|
*
|
|
* \sa SDL_RWclose
|
|
* \sa SDL_RWFromConstMem
|
|
* \sa SDL_RWFromFile
|
|
* \sa SDL_RWFromFP
|
|
* \sa SDL_RWFromMem
|
|
* \sa SDL_RWseek
|
|
* \sa SDL_RWwrite
|
|
*/
|
|
extern DECLSPEC size_t SDLCALL SDL_RWread(SDL_RWops *context,
|
|
void *ptr, size_t size,
|
|
size_t maxnum);
|
|
|
|
/**
|
|
* Write to an SDL_RWops data stream.
|
|
*
|
|
* This function writes exactly `num` objects each of size `size` from the
|
|
* area pointed at by `ptr` to the stream. If this fails for any reason,
|
|
* it'll return less than `num` to demonstrate how far the write progressed.
|
|
* On success, it returns `num`.
|
|
*
|
|
* SDL_RWwrite is actually a function wrapper that calls the SDL_RWops's
|
|
* `write` method appropriately, to simplify application development.
|
|
*
|
|
* \param context a pointer to an SDL_RWops structure
|
|
* \param ptr a pointer to a buffer containing data to write
|
|
* \param size the size of an object to write, in bytes
|
|
* \param num the number of objects to write
|
|
* \returns the number of objects written, which will be less than **num** on
|
|
* error; call SDL_GetError() for more information.
|
|
*
|
|
* \sa SDL_RWclose
|
|
* \sa SDL_RWFromConstMem
|
|
* \sa SDL_RWFromFile
|
|
* \sa SDL_RWFromFP
|
|
* \sa SDL_RWFromMem
|
|
* \sa SDL_RWread
|
|
* \sa SDL_RWseek
|
|
*/
|
|
extern DECLSPEC size_t SDLCALL SDL_RWwrite(SDL_RWops *context,
|
|
const void *ptr, size_t size,
|
|
size_t num);
|
|
|
|
/**
|
|
* Close and free an allocated SDL_RWops structure.
|
|
*
|
|
* SDL_RWclose() closes and cleans up the SDL_RWops stream. It releases any
|
|
* resources used by the stream and frees the SDL_RWops itself with
|
|
* SDL_FreeRW(). This returns 0 on success, or -1 if the stream failed to
|
|
* flush to its output (e.g. to disk).
|
|
*
|
|
* Note that if this fails to flush the stream to disk, this function reports
|
|
* an error, but the SDL_RWops is still invalid once this function returns.
|
|
*
|
|
* SDL_RWclose() is actually a macro that calls the SDL_RWops's `close`
|
|
* method appropriately, to simplify application development.
|
|
*
|
|
* \param context SDL_RWops structure to close
|
|
* \returns 0 on success or a negative error code on failure; call
|
|
* SDL_GetError() for more information.
|
|
*
|
|
* \sa SDL_RWFromConstMem
|
|
* \sa SDL_RWFromFile
|
|
* \sa SDL_RWFromFP
|
|
* \sa SDL_RWFromMem
|
|
* \sa SDL_RWread
|
|
* \sa SDL_RWseek
|
|
* \sa SDL_RWwrite
|
|
*/
|
|
extern DECLSPEC int SDLCALL SDL_RWclose(SDL_RWops *context);
|
|
|
|
/**
|
|
* Load all the data from an SDL data stream.
|
|
*
|
|
* The data is allocated with a zero byte at the end (null terminated) for
|
|
* convenience. This extra byte is not included in the value reported via
|
|
* `datasize`.
|
|
*
|
|
* The data should be freed with SDL_free().
|
|
*
|
|
* \param src the SDL_RWops to read all available data from
|
|
* \param datasize if not NULL, will store the number of bytes read
|
|
* \param freesrc if non-zero, calls SDL_RWclose() on `src` before returning
|
|
* \returns the data, or NULL if there was an error.
|
|
*/
|
|
extern DECLSPEC void *SDLCALL SDL_LoadFile_RW(SDL_RWops *src,
|
|
size_t *datasize,
|
|
int freesrc);
|
|
|
|
/**
|
|
* Load all the data from a file path.
|
|
*
|
|
* The data is allocated with a zero byte at the end (null terminated) for
|
|
* convenience. This extra byte is not included in the value reported via
|
|
* `datasize`.
|
|
*
|
|
* The data should be freed with SDL_free().
|
|
*
|
|
* \param file the path to read all available data from
|
|
* \param datasize if not NULL, will store the number of bytes read
|
|
* \returns the data, or NULL if there was an error.
|
|
*/
|
|
extern DECLSPEC void *SDLCALL SDL_LoadFile(const char *file, size_t *datasize);
|
|
|
|
/**
|
|
* \name Read endian functions
|
|
*
|
|
* Read an item of the specified endianness and return in native format.
|
|
*/
|
|
/* @{ */
|
|
extern DECLSPEC Uint8 SDLCALL SDL_ReadU8(SDL_RWops * src);
|
|
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);
|
|
/* @} *//* Read endian functions */
|
|
|
|
/**
|
|
* \name Write endian functions
|
|
*
|
|
* Write an item of native format to the specified endianness.
|
|
*/
|
|
/* @{ */
|
|
extern DECLSPEC size_t SDLCALL SDL_WriteU8(SDL_RWops * dst, Uint8 value);
|
|
extern DECLSPEC size_t SDLCALL SDL_WriteLE16(SDL_RWops * dst, Uint16 value);
|
|
extern DECLSPEC size_t SDLCALL SDL_WriteBE16(SDL_RWops * dst, Uint16 value);
|
|
extern DECLSPEC size_t SDLCALL SDL_WriteLE32(SDL_RWops * dst, Uint32 value);
|
|
extern DECLSPEC size_t SDLCALL SDL_WriteBE32(SDL_RWops * dst, Uint32 value);
|
|
extern DECLSPEC size_t SDLCALL SDL_WriteLE64(SDL_RWops * dst, Uint64 value);
|
|
extern DECLSPEC size_t SDLCALL SDL_WriteBE64(SDL_RWops * dst, Uint64 value);
|
|
/* @} *//* Write endian functions */
|
|
|
|
/* Ends C function definitions when using C++ */
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#include "close_code.h"
|
|
|
|
#endif /* SDL_rwops_h_ */
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|