| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2024 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. |
| */ |
| |
| #include "SDL_iostreamromfs.h" |
| |
| /* Checks if the mode is a kind of reading */ |
| static SDL_bool IsReadMode(const char *mode); |
| |
| /* Checks if the file starts with the given prefix */ |
| static SDL_bool HasPrefix(const char *file, const char *prefix); |
| |
| static FILE *TryOpenFile(const char *file, const char *mode); |
| static FILE *TryOpenInRomfs(const char *file, const char *mode); |
| |
| /* Nintendo 3DS applications may embed resources in the executable. The |
| resources are stored in a special read-only partition prefixed with |
| 'romfs:/'. As such, when opening a file, we should first try the romfs |
| unless sdmc is specifically mentioned. |
| */ |
| FILE *N3DS_FileOpen(const char *file, const char *mode) |
| { |
| /* romfs are read-only */ |
| if (!IsReadMode(mode)) { |
| return fopen(file, mode); |
| } |
| |
| /* If the path has an explicit prefix, we skip the guess work */ |
| if (HasPrefix(file, "romfs:/") || HasPrefix(file, "sdmc:/")) { |
| return fopen(file, mode); |
| } |
| |
| return TryOpenFile(file, mode); |
| } |
| |
| static SDL_bool IsReadMode(const char *mode) |
| { |
| return SDL_strchr(mode, 'r') != NULL; |
| } |
| |
| static SDL_bool HasPrefix(const char *file, const char *prefix) |
| { |
| return SDL_strncmp(prefix, file, SDL_strlen(prefix)) == 0; |
| } |
| |
| static FILE *TryOpenFile(const char *file, const char *mode) |
| { |
| FILE *fp = NULL; |
| |
| fp = TryOpenInRomfs(file, mode); |
| if (!fp) { |
| fp = fopen(file, mode); |
| } |
| |
| return fp; |
| } |
| |
| FILE *TryOpenInRomfs(const char *file, const char *mode) |
| { |
| FILE *fp = NULL; |
| char *prefixed_filepath = NULL; |
| |
| if (SDL_asprintf(&prefixed_filepath, "romfs:/%s", file) < 0) { |
| return NULL; |
| } |
| |
| fp = fopen(prefixed_filepath, mode); |
| |
| SDL_free(prefixed_filepath); |
| return fp; |
| } |