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N3DS: Refactor N3DS_FileOpen.

This commit is contained in:
Pierre Wendling 2022-11-14 17:38:42 -05:00 committed by Sam Lantinga
parent dcfa127fd4
commit 491d0bcc3c
1 changed files with 48 additions and 12 deletions
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60
src/file/n3ds/SDL_rwopsromfs.c
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@ -22,6 +22,15 @@
#include "SDL_rwopsromfs.h" #include "SDL_rwopsromfs.h"
#include "SDL_error.h" #include "SDL_error.h"
/* Checks if the mode is a kind of reading */
SDL_FORCE_INLINE SDL_bool IsReadMode(const char *mode);
/* Checks if the file starts with the given prefix */
SDL_FORCE_INLINE SDL_bool HasPrefix(const char *file, const char *prefix);
SDL_FORCE_INLINE FILE *TryOpenFile(const char *file, const char *mode);
SDL_FORCE_INLINE FILE *TryOpenInRomfs(const char *file, const char *mode);
/* Nintendo 3DS applications may embed resources in the executable. The /* Nintendo 3DS applications may embed resources in the executable. The
resources are stored in a special read-only partition prefixed with resources are stored in a special read-only partition prefixed with
'romfs:/'. As such, when opening a file, we should first try the romfs 'romfs:/'. As such, when opening a file, we should first try the romfs
@ -30,31 +39,58 @@
FILE * FILE *
N3DS_FileOpen(const char *file, const char *mode) N3DS_FileOpen(const char *file, const char *mode)
{ {
FILE *fp = NULL;
char *romfs_path;
/* romfs are read-only */ /* romfs are read-only */
if (SDL_strchr(mode, 'r') == NULL) { if (!IsReadMode(mode)) {
return fopen(file, mode); return fopen(file, mode);
} }
/* If the path has an explicit prefix, we skip the guess work */ /* If the path has an explicit prefix, we skip the guess work */
if (SDL_strncmp("romfs:/", file, 7) == 0 || if (HasPrefix(file, "romfs:/") || HasPrefix(file, "sdmc:/")) {
SDL_strncmp("sdmc:/", file, 6) == 0) {
return fopen(file, mode); return fopen(file, mode);
} }
if (SDL_asprintf(&romfs_path, "romfs:/%s", file) < 0) { return TryOpenFile(file, mode);
SDL_OutOfMemory(); }
return NULL;
}
fp = fopen(romfs_path, mode); SDL_FORCE_INLINE SDL_bool
IsReadMode(const char *mode)
{
return SDL_strchr(mode, 'r') != NULL;
}
SDL_FORCE_INLINE SDL_bool
HasPrefix(const char *file, const char *prefix)
{
return SDL_strncmp(prefix, file, SDL_strlen(prefix)) == 0;
}
SDL_FORCE_INLINE FILE *
TryOpenFile(const char *file, const char *mode)
{
FILE *fp = NULL;
fp = TryOpenInRomfs(file, mode);
if (fp == NULL) { if (fp == NULL) {
fp = fopen(file, mode); fp = fopen(file, mode);
} }
SDL_free(romfs_path); return fp;
}
SDL_FORCE_INLINE FILE *
TryOpenInRomfs(const char *file, const char *mode)
{
FILE *fp = NULL;
char *prefixed_filepath = NULL;
if (SDL_asprintf(&prefixed_filepath, "romfs:/%s", file) < 0) {
SDL_OutOfMemory();
return NULL;
}
fp = fopen(prefixed_filepath, mode);
SDL_free(prefixed_filepath);
return fp; return fp;
} }