From 75e1e7a5e26491e942fb2b25f518d8e2e3112721 Mon Sep 17 00:00:00 2001
From: inmarket <andrewh@inmarket.com.au>
Date: Fri, 15 Aug 2014 02:22:02 +1000
Subject: Add GFILE support for PetitFS (a very tiny FAT implementation)

---
 src/gfile/inc_petitfs.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 src/gfile/inc_petitfs.c

(limited to 'src/gfile/inc_petitfs.c')

diff --git a/src/gfile/inc_petitfs.c b/src/gfile/inc_petitfs.c
new file mode 100644
index 00000000..9b3b510b
--- /dev/null
+++ b/src/gfile/inc_petitfs.c
@@ -0,0 +1,157 @@
+/*
+ * 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
+ */
+
+/********************************************************
+ * The PETITFS file-system
+ ********************************************************/
+
+#include "gfx.h"
+
+#if GFX_USE_GFILE && GFILE_NEED_PETITFS
+
+#include "gfile_fs.h"
+#include "petitfs_wrapper.h"
+
+static bool_t petitfsExists(const char* fname);
+static bool_t petitfsOpen(GFILE* f, const char* fname);
+static int petitfsRead(GFILE* f, void* buf, int size);
+static bool_t petitfsSetPos(GFILE* f, long int pos);
+#if GFILE_NEED_FILELISTS && _FS_MINIMIZE <= 1
+	static gfileList *petitfsFlOpen(const char *path, bool_t dirs);
+	static const char *petitfsFlRead(gfileList *pfl);
+	static void petitfsFlClose(gfileList *pfl);
+#endif
+
+const GFILEVMT FsPetitFSVMT = {
+	GFSFLG_WRITEABLE | GFSFLG_SEEKABLE,
+	'F',
+	0,
+	petitfsExists,
+	0,					// No Filesize
+	0,
+	petitfsOpen,
+	0,					// No Close
+	petitfsRead,
+	0,					// No Write
+	petitfsSetPos,
+	0,					// No Getsize
+	0,					// No EOF
+	0, 0, 0,			// No Mount, UnMount or Sync
+	#if GFILE_NEED_FILELISTS
+		#if _USE_DIR
+			petitfsFlOpen, petitfsFlRead, petitfsFlClose
+		#else
+			0, 0, 0
+		#endif
+	#endif
+};
+
+// Our directory list structure
+typedef struct petitfsList {
+	gfileList	fl;					// This must be the first element.
+	DIR			dir;
+	FILINFO		fno;
+} petitfsList;
+
+// optimize these later on. Use an array to have multiple
+static bool_t petitfs_mounted = FALSE;
+static FATFS petitfs_fs;
+
+static bool_t petitfsExists(const char* fname)
+{
+	// Mount first
+	if (!petitfs_mounted && pf_mount(&petitfs_fs) != FR_OK)
+		return FALSE;
+
+	// Open
+	if (pf_open(fname) != FR_OK)
+		return FALSE;
+
+	return TRUE;
+}
+
+static bool_t petitfsOpen(GFILE* f, const char* fname)
+{
+	// No writing
+	if ((f->flags & GFILEFLG_WRITE))
+		return FALSE;
+
+	// Mount first
+	if (!petitfs_mounted && pf_mount(&petitfs_fs) != FR_OK)
+		return FALSE;
+
+	// Open
+	if (pf_open(fname) != FR_OK)
+		return FALSE;
+
+	f->obj = &petitfs_fs;
+	return TRUE;	
+}
+
+static int petitfsRead(GFILE* f, void* buf, int size)
+{
+	int		br;
+	(void)	f;
+
+	if (pf_read(buf, size, (UINT*)&br) != FR_OK)
+		return 0;
+
+	return br;
+}
+
+static bool_t petitfsSetPos(GFILE* f, long int pos)
+{
+	(void)	f;
+	return pf_lseek((DWORD)pos) == FR_OK;
+}
+
+#if GFILE_NEED_FILELISTS
+	static gfileList *petitfsFlOpen(const char *path, bool_t dirs) {
+		petitfsList	*p;
+		(void) dirs;
+
+		if (!(p = gfxAlloc(sizeof(petitfsList))))
+			return 0;
+
+		if (pf_opendir(&p->dir, path) != FR_OK) {
+			gfxFree(p);
+			return 0;
+		}
+		return &p->fl;
+	}
+
+	static const char *petitfsFlRead(gfileList *pfl) {
+		#define ffl		((petitfsList *)pfl)
+
+		while(1) {
+			// Read the next entry
+			if (pf_readdir(&ffl->dir, &ffl->fno) != FR_OK || !ffl->fno.fname[0])
+				return 0;
+
+			/* Ignore dot entries */
+			if (ffl->fno.fname[0] == '.') continue;
+
+			/* Is it a directory */
+			if (ffl->fl.dirs) {
+				if ((ffl->fno.fattrib & AM_DIR))
+					break;
+			} else {
+				if (!(ffl->fno.fattrib & (AM_DIR|AM_HID|AM_SYS)))
+					break;
+			}
+		}
+
+		return ffl->fno.fname;
+	}
+
+	static void petitfsFlClose(gfileList *pfl) {
+		gfxFree(pfl);
+	}
+
+#endif
+
+#endif //GFX_USE_GFILE && GFILE_NEED_PETITFS
-- 
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