diff options
Diffstat (limited to 'src/gfile/inc_romfs.c')
-rw-r--r-- | src/gfile/inc_romfs.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/gfile/inc_romfs.c b/src/gfile/inc_romfs.c new file mode 100644 index 00000000..49c1b173 --- /dev/null +++ b/src/gfile/inc_romfs.c @@ -0,0 +1,95 @@ +/* + * This file is subject to the terms of the GFX License. If a copy of + * the license was not distributed with this file, you can obtain one at: + * + * http://ugfx.org/license.html + */ + +/** + * This file is included by src/gfile/gfile.c + */ + +/******************************************************** + * The ROM file-system VMT + ********************************************************/ + +#include <string.h> + +// What directory file formats do we understand +#define ROMFS_DIR_VER_MAX 0x0000 + +// Compression Formats +#define ROMFS_CMP_UNCOMPRESSED 0 + +typedef struct ROMFS_DIRENTRY { + uint16_t ver; // Directory Entry Version + uint16_t cmp; // Compression format + const struct ROMFS_DIRENTRY * next; // The next entry + const char * name; // The file name + long int size; // The file size + const char * file; // The file data +} ROMFS_DIRENTRY; + +#define ROMFS_DIRENTRY_HEAD 0 + +#include "romfs_files.h" + +static const ROMFS_DIRENTRY const *FsROMHead = ROMFS_DIRENTRY_HEAD; + +static bool_t ROMExists(const char *fname); +static long int ROMFilesize(const char *fname); +static bool_t ROMOpen(GFILE *f, const char *fname); +static void ROMClose(GFILE *f); +static int ROMRead(GFILE *f, void *buf, int size); +static bool_t ROMSetpos(GFILE *f, long int pos); +static long int ROMGetsize(GFILE *f); +static bool_t ROMEof(GFILE *f); + +static const GFILEVMT FsROMVMT = { + GFILE_CHAINHEAD, // next + GFSFLG_CASESENSITIVE|GFSFLG_SEEKABLE|GFSFLG_FAST, // flags + 'S', // prefix + 0, ROMExists, ROMFilesize, 0, + ROMOpen, ROMClose, ROMRead, 0, + ROMSetpos, ROMGetsize, ROMEof, +}; +#undef GFILE_CHAINHEAD +#define GFILE_CHAINHEAD &FsROMVMT + +static const ROMFS_DIRENTRY *ROMFindFile(const char *fname) { + const ROMFS_DIRENTRY *p; + + for(p = FsROMHead; p; p = p->next) { + if (p->ver <= ROMFS_DIR_VER_MAX && p->cmp == ROMFS_CMP_UNCOMPRESSED && !strcmp(p->name, fname)) + break; + } + return p; +} +static bool_t ROMExists(const char *fname) { return ROMFindFile(fname) != 0; } +static long int ROMFilesize(const char *fname) { + const ROMFS_DIRENTRY *p; + + if (!(p = ROMFindFile(fname))) return -1; + return p->size; +} +static bool_t ROMOpen(GFILE *f, const char *fname) { + const ROMFS_DIRENTRY *p; + + if (!(p = ROMFindFile(fname))) return FALSE; + f->obj = (void *)p; + return TRUE; +} +static void ROMClose(GFILE *f) { (void)f; } +static int ROMRead(GFILE *f, void *buf, int size) { + const ROMFS_DIRENTRY *p; + + p = (const ROMFS_DIRENTRY *)f->obj; + if (p->size - f->pos < size) + size = p->size - f->pos; + if (size <= 0) return 0; + memcpy(buf, p->file+f->pos, size); + return size; +} +static bool_t ROMSetpos(GFILE *f, long int pos) { return pos <= ((const ROMFS_DIRENTRY *)f->obj)->size; } +static long int ROMGetsize(GFILE *f) { return ((const ROMFS_DIRENTRY *)f->obj)->size; } +static bool_t ROMEof(GFILE *f) { return f->pos >= ((const ROMFS_DIRENTRY *)f->obj)->size; } |