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93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2023 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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#include "SDL_rwopsromfs.h"
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#include "SDL_error.h"
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/* Checks if the mode is a kind of reading */
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static SDL_bool IsReadMode(const char *mode);
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/* Checks if the file starts with the given prefix */
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static SDL_bool HasPrefix(const char *file, const char *prefix);
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static FILE *TryOpenFile(const char *file, const char *mode);
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static FILE *TryOpenInRomfs(const char *file, const char *mode);
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/* Nintendo 3DS applications may embed resources in the executable. The
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resources are stored in a special read-only partition prefixed with
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'romfs:/'. As such, when opening a file, we should first try the romfs
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unless sdmc is specifically mentionned.
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*/
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FILE *N3DS_FileOpen(const char *file, const char *mode)
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{
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/* romfs are read-only */
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if (!IsReadMode(mode)) {
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return fopen(file, mode);
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}
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/* If the path has an explicit prefix, we skip the guess work */
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if (HasPrefix(file, "romfs:/") || HasPrefix(file, "sdmc:/")) {
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return fopen(file, mode);
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}
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return TryOpenFile(file, mode);
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}
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static SDL_bool IsReadMode(const char *mode)
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{
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return SDL_strchr(mode, 'r') != NULL;
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}
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static SDL_bool HasPrefix(const char *file, const char *prefix)
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{
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return SDL_strncmp(prefix, file, SDL_strlen(prefix)) == 0;
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}
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static FILE *TryOpenFile(const char *file, const char *mode)
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{
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FILE *fp = NULL;
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fp = TryOpenInRomfs(file, mode);
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if (!fp) {
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fp = fopen(file, mode);
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}
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return fp;
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}
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static FILE *TryOpenInRomfs(const char *file, const char *mode)
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{
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FILE *fp = NULL;
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char *prefixed_filepath = NULL;
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if (SDL_asprintf(&prefixed_filepath, "romfs:/%s", file) < 0) {
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SDL_OutOfMemory();
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return NULL;
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}
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fp = fopen(prefixed_filepath, mode);
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SDL_free(prefixed_filepath);
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return fp;
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}
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/* vi: set sts=4 ts=4 sw=4 expandtab: */
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