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/*
* 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.io/license.html
*/
/********************************************************
* The virtual memory file-system
********************************************************/
#include "../../gfx.h"
#if GFX_USE_GFILE && GFILE_NEED_MEMFS
#include "gfile_fs.h"
#include <string.h>
static int MEMRead(GFILE *f, void *buf, int size);
static int MEMWrite(GFILE *f, const void *buf, int size);
static gBool MEMSetpos(GFILE *f, gFileSize pos);
static const GFILEVMT FsMemVMT = {
GFSFLG_SEEKABLE|GFSFLG_WRITEABLE, // flags
0, // prefix
0, 0, 0, 0,
0, 0, MEMRead, MEMWrite,
MEMSetpos, 0, 0,
0, 0, 0,
#if GFILE_NEED_FILELISTS
0, 0, 0,
#endif
};
static int MEMRead(GFILE *f, void *buf, int size) {
memcpy(buf, ((char *)f->obj)+f->pos, size);
return size;
}
static int MEMWrite(GFILE *f, const void *buf, int size) {
memcpy(((char *)f->obj)+f->pos, buf, size);
return size;
}
static gBool MEMSetpos(GFILE *f, gFileSize pos) {
(void) f;
(void) pos;
return gTrue;
}
GFILE * gfileOpenMemory(void *memptr, const char *mode) {
GFILE *f;
// Get an empty file and set the flags
if (!(f = _gfileFindSlot(mode)))
return 0;
// File is open - fill in all the details
f->vmt = &FsMemVMT;
f->obj = memptr;
f->pos = 0;
f->flags |= GFILEFLG_OPEN|GFILEFLG_CANSEEK;
return f;
}
#endif //GFX_USE_GFILE && GFILE_NEED_MEMFS
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