From fb29f601f1d5e4c74af9c0d7f53cdf9b57f2cb85 Mon Sep 17 00:00:00 2001
From: inmarket <andrewh@inmarket.com.au>
Date: Sun, 5 Jan 2014 00:02:53 +1000
Subject: Start of GFILE module

---
 src/gfile/inc_romfs.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/gfile/inc_romfs.c

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

diff --git a/src/gfile/inc_romfs.c b/src/gfile/inc_romfs.c
new file mode 100644
index 00000000..321dc9b1
--- /dev/null
+++ b/src/gfile/inc_romfs.c
@@ -0,0 +1,97 @@
+/*
+ * 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>
+
+typedef struct ROMFS_DIRENTRY {
+	const struct ROMFS_DIRENTRY *	next;
+	const char *					name;
+	long int						size;
+	const char *					file;
+} 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, const char *mode);
+static void ROMClose(GFILE *f);
+static int ROMRead(GFILE *f, char *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
+	'S',												// prefix
+	GFSFLG_CASESENSITIVE|GFSFLG_SEEKABLE|GFSFLG_FAST,	// flags
+	0, ROMExists, ROMFilesize, 0,
+	ROMOpen, ROMClose, ROMRead, 0,
+	ROMSetpos, ROMGetsize, ROMEof,
+};
+#undef GFILE_CHAINHEAD
+#define GFILE_CHAINHEAD		&FsROMVMT
+
+static ROMFS_DIRENTRY *ROMFindFile(const char *fname) {
+	const ROMFS_DIRENTRY *p;
+
+	for(p = FsROMHead; p; p = p->next) {
+		if (!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 char *mode) {
+	const ROMFS_DIRENTRY *p;
+
+	// Check mode
+	if (mode[0] != 'r') return FALSE;
+	while(*++mode) {
+		switch(*mode) {
+		case '+': case 'w': case 'a':
+			return FALSE;
+		}
+	}
+
+	if (!(p = ROMFindFile(fname))) return FALSE;
+	f->vmt = &FsROMVMT;
+	f->obj = (void *)p;
+	return TRUE;
+}
+static void ROMClose(GFILE *f) { (void)f; }
+static int ROMRead(GFILE *f, char *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; }
-- 
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