88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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/**
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* This file is included by src/gfile/gfile.c
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*/
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/********************************************************
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* The ROM file-system VMT
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********************************************************/
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#include <string.h>
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typedef struct ROMFS_DIRENTRY {
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const struct ROMFS_DIRENTRY * next;
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const char * name;
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long int size;
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const char * file;
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} ROMFS_DIRENTRY;
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#define ROMFS_DIRENTRY_HEAD 0
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#include "romfs_files.h"
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static const ROMFS_DIRENTRY const *FsROMHead = ROMFS_DIRENTRY_HEAD;
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static bool_t ROMExists(const char *fname);
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static long int ROMFilesize(const char *fname);
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static bool_t ROMOpen(GFILE *f, const char *fname);
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static void ROMClose(GFILE *f);
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static int ROMRead(GFILE *f, void *buf, int size);
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static bool_t ROMSetpos(GFILE *f, long int pos);
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static long int ROMGetsize(GFILE *f);
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static bool_t ROMEof(GFILE *f);
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static const GFILEVMT FsROMVMT = {
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GFILE_CHAINHEAD, // next
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GFSFLG_CASESENSITIVE|GFSFLG_SEEKABLE|GFSFLG_FAST, // flags
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'S', // prefix
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0, ROMExists, ROMFilesize, 0,
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ROMOpen, ROMClose, ROMRead, 0,
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ROMSetpos, ROMGetsize, ROMEof,
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};
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#undef GFILE_CHAINHEAD
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#define GFILE_CHAINHEAD &FsROMVMT
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static ROMFS_DIRENTRY *ROMFindFile(const char *fname) {
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const ROMFS_DIRENTRY *p;
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for(p = FsROMHead; p; p = p->next) {
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if (!strcmp(p->name, fname))
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break;
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}
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return p;
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}
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static bool_t ROMExists(const char *fname) { return ROMFindFile(fname) != 0; }
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static long int ROMFilesize(const char *fname) {
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const ROMFS_DIRENTRY *p;
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if (!(p = ROMFindFile(fname))) return -1;
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return p->size;
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}
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static bool_t ROMOpen(GFILE *f, const char *fname) {
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const ROMFS_DIRENTRY *p;
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if (!(p = ROMFindFile(fname))) return FALSE;
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f->obj = (void *)p;
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return TRUE;
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}
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static void ROMClose(GFILE *f) { (void)f; }
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static int ROMRead(GFILE *f, void *buf, int size) {
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const ROMFS_DIRENTRY *p;
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p = (const ROMFS_DIRENTRY *)f->obj;
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if (p->size - f->pos < size)
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size = p->size - f->pos;
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if (size <= 0) return 0;
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memcpy(buf, p->file+f->pos, size);
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return size;
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}
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static bool_t ROMSetpos(GFILE *f, long int pos) { return pos <= ((const ROMFS_DIRENTRY *)f->obj)->size; }
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static long int ROMGetsize(GFILE *f) { return ((const ROMFS_DIRENTRY *)f->obj)->size; }
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static bool_t ROMEof(GFILE *f) { return f->pos >= ((const ROMFS_DIRENTRY *)f->obj)->size; }
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