351 lines
12 KiB
C
351 lines
12 KiB
C
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_storage.h
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*
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* Include file for storage container SDL API functions
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*/
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#ifndef SDL_storage_h_
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#define SDL_storage_h_
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#include <SDL3/SDL_stdinc.h>
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#include <SDL3/SDL_filesystem.h>
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#include <SDL3/SDL_properties.h>
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#include <SDL3/SDL_begin_code.h>
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* !!! FIXME: Don't let this ship without async R/W support!!! */
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typedef struct SDL_StorageInterface
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{
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/* Called when the storage is closed */
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int (SDLCALL *close)(void *userdata);
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/* Optional, returns whether the storage is currently ready for access */
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SDL_bool (SDLCALL *ready)(void *userdata);
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/* Enumerate a directory, optional for write-only storage */
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int (SDLCALL *enumerate)(void *userdata, const char *path, SDL_EnumerateDirectoryCallback callback, void *callback_userdata);
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/* Get path information, optional for write-only storage */
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int (SDLCALL *info)(void *userdata, const char *path, SDL_PathInfo *info);
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/* Read a file from storage, optional for write-only storage */
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int (SDLCALL *read_file)(void *userdata, const char *path, void *destination, Uint64 length);
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/* Write a file to storage, optional for read-only storage */
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int (SDLCALL *write_file)(void *userdata, const char *path, const void *source, Uint64 length);
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/* Create a directory, optional for read-only storage */
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int (SDLCALL *mkdir)(void *userdata, const char *path);
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/* Remove a file or empty directory, optional for read-only storage */
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int (SDLCALL *remove)(void *userdata, const char *path);
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/* Rename a path, optional for read-only storage */
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int (SDLCALL *rename)(void *userdata, const char *oldpath, const char *newpath);
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/* Get the space remaining, optional for read-only storage */
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Uint64 (SDLCALL *space_remaining)(void *userdata);
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} SDL_StorageInterface;
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typedef struct SDL_Storage SDL_Storage;
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/**
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* Opens up a read-only container for the application's filesystem.
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*
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* \param override a path to override the backend's default title root
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* \param props a property list that may contain backend-specific information
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* \returns a title storage container on success or NULL on failure; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_CloseStorage
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* \sa SDL_GetStorageFileSize
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* \sa SDL_OpenUserStorage
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* \sa SDL_ReadStorageFile
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*/
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extern DECLSPEC SDL_Storage *SDLCALL SDL_OpenTitleStorage(const char *override, SDL_PropertiesID props);
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/**
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* Opens up a container for a user's unique read/write filesystem.
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*
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* While title storage can generally be kept open throughout runtime, user
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* storage should only be opened when the client is ready to read/write files.
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* This allows the backend to properly batch file operations and flush them
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* when the container has been closed; ensuring safe and optimal save I/O.
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*
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* \param org the name of your organization
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* \param app the name of your application
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* \param props a property list that may contain backend-specific information
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* \returns a user storage container on success or NULL on failure; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_CloseStorage
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* \sa SDL_GetStorageFileSize
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* \sa SDL_GetStorageSpaceRemaining
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* \sa SDL_OpenTitleStorage
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* \sa SDL_ReadStorageFile
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* \sa SDL_StorageReady
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* \sa SDL_WriteStorageFile
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*/
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extern DECLSPEC SDL_Storage *SDLCALL SDL_OpenUserStorage(const char *org, const char *app, SDL_PropertiesID props);
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/**
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* Opens up a container for local filesystem storage.
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*
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* This is provided for development and tools. Portable applications should
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* use SDL_OpenTitleStorage() for access to game data and
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* SDL_OpenUserStorage() for access to user data.
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*
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* \param path the base path prepended to all storage paths, or NULL for no
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* base path
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* \returns a filesystem storage container on success or NULL on failure; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_CloseStorage
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* \sa SDL_GetStorageFileSize
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* \sa SDL_GetStorageSpaceRemaining
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* \sa SDL_OpenTitleStorage
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* \sa SDL_OpenUserStorage
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* \sa SDL_ReadStorageFile
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* \sa SDL_WriteStorageFile
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*/
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extern DECLSPEC SDL_Storage *SDLCALL SDL_OpenFileStorage(const char *path);
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/**
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* Opens up a container using a client-provided storage interface.
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*
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* Applications do not need to use this function unless they are providing
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* their own SDL_Storage implementation. If you just need an SDL_Storage, you
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* should use the built-in implementations in SDL, like SDL_OpenTitleStorage()
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* or SDL_OpenUserStorage().
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*
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* \param iface the function table to be used by this container
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* \param userdata the pointer that will be passed to the store interface
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* \returns a storage container on success or NULL on failure; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_CloseStorage
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* \sa SDL_GetStorageFileSize
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* \sa SDL_GetStorageSpaceRemaining
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* \sa SDL_ReadStorageFile
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* \sa SDL_StorageReady
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* \sa SDL_WriteStorageFile
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*/
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extern DECLSPEC SDL_Storage *SDLCALL SDL_OpenStorage(const SDL_StorageInterface *iface, void *userdata);
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/**
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* Closes and frees a storage container.
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*
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* \param storage a storage container to close
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* \returns 0 if the container was freed with no errors, a negative value
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* otherwise; call SDL_GetError() for more information. Even if the
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* function returns an error, the container data will be freed; the
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* error is only for informational purposes.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_OpenFileStorage
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* \sa SDL_OpenStorage
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* \sa SDL_OpenTitleStorage
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* \sa SDL_OpenUserStorage
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*/
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extern DECLSPEC int SDLCALL SDL_CloseStorage(SDL_Storage *storage);
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/**
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* Checks if the storage container is ready to use.
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*
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* This function should be called in regular intervals until it returns
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* SDL_TRUE - however, it is not recommended to spinwait on this call, as the
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* backend may depend on a synchronous message loop.
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*
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* \param storage a storage container to query
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* \returns SDL_TRUE if the container is ready, SDL_FALSE otherwise
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern DECLSPEC SDL_bool SDLCALL SDL_StorageReady(SDL_Storage *storage);
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/**
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* Query the size of a file within a storage container.
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*
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* \param storage a storage container to query
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* \param path the relative path of the file to query
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* \param length a pointer to be filled with the file's length
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* \returns 0 if the file could be queried, a negative value otherwise; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_ReadStorageFile
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* \sa SDL_StorageReady
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*/
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extern DECLSPEC int SDLCALL SDL_GetStorageFileSize(SDL_Storage *storage, const char *path, Uint64 *length);
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/**
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* Synchronously read a file from a storage container into a client-provided
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* buffer.
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*
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* \param storage a storage container to read from
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* \param path the relative path of the file to read
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* \param destination a client-provided buffer to read the file into
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* \param length the length of the destination buffer
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* \returns 0 if the file was read, a negative value otherwise; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_GetStorageFileSize
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* \sa SDL_StorageReady
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* \sa SDL_WriteStorageFile
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*/
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extern DECLSPEC int SDLCALL SDL_ReadStorageFile(SDL_Storage *storage, const char *path, void *destination, Uint64 length);
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/**
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* Synchronously write a file from client memory into a storage container.
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*
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* \param storage a storage container to write to
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* \param path the relative path of the file to write
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* \param source a client-provided buffer to write from
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* \param length the length of the source buffer
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* \returns 0 if the file was written, a negative value otherwise; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_GetStorageSpaceRemaining
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* \sa SDL_ReadStorageFile
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* \sa SDL_StorageReady
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*/
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extern DECLSPEC int SDL_WriteStorageFile(SDL_Storage *storage, const char *path, const void *source, Uint64 length);
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/**
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* Create a directory in a writable storage container.
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*
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* \param storage a storage container
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* \param path the path of the directory to create
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* \returns 0 on success or a negative error code on failure; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_StorageReady
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*/
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extern DECLSPEC int SDLCALL SDL_CreateStorageDirectory(SDL_Storage *storage, const char *path);
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/**
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* Enumerate a directory in a storage container.
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*
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* \param storage a storage container
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* \param path the path of the directory to enumerate
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* \param callback a function that is called for each entry in the directory
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* \param userdata a pointer that is passed to `callback`
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* \returns 0 on success or a negative error code on failure; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_StorageReady
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*/
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extern DECLSPEC int SDLCALL SDL_EnumerateStorageDirectory(SDL_Storage *storage, const char *path, SDL_EnumerateDirectoryCallback callback, void *userdata);
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/**
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* Remove a file or an empty directory in a writable storage container.
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*
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* \param storage a storage container
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* \param path the path of the directory to enumerate
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* \returns 0 on success or a negative error code on failure; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_StorageReady
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*/
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extern DECLSPEC int SDLCALL SDL_RemoveStoragePath(SDL_Storage *storage, const char *path);
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/**
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* Rename a file or directory in a writable storage container.
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*
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* \param storage a storage container
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* \param oldpath the old path
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* \param newpath the new path
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* \returns 0 on success or a negative error code on failure; call
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* SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_StorageReady
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*/
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extern DECLSPEC int SDLCALL SDL_RenameStoragePath(SDL_Storage *storage, const char *oldpath, const char *newpath);
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/**
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* Get information about a filesystem path in a storage container.
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*
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* \param storage a storage container
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* \param path the path to query
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* \param info a pointer filled in with information about the path, or NULL to
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* check for the existence of a file
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* \returns 0 on success or a negative error code if the file doesn't exist,
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* or another failure; call SDL_GetError() for more information.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_StorageReady
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*/
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extern DECLSPEC int SDLCALL SDL_GetStoragePathInfo(SDL_Storage *storage, const char *path, SDL_PathInfo *info);
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/**
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* Queries the remaining space in a storage container.
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*
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* \param storage a storage container to query
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* \returns the amount of remaining space, in bytes
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_StorageReady
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* \sa SDL_WriteStorageFile
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*/
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extern DECLSPEC Uint64 SDLCALL SDL_GetStorageSpaceRemaining(SDL_Storage *storage);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include <SDL3/SDL_close_code.h>
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#endif /* SDL_storage_h_ */
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