1 files changed, 65 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/libfat/cache.c b/contrib/syslinux-4.02/libfat/cache.c
new file mode 100644
index 0000000..85b7ead
--- /dev/null
+++ b/contrib/syslinux-4.02/libfat/cache.c
@@ -0,0 +1,65 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * cache.c
+ *
+ * Simple sector cache
+ */
+
+#include <stdlib.h>
+#include "libfatint.h"
+
+void *libfat_get_sector(struct libfat_filesystem *fs, libfat_sector_t n)
+{
+    struct libfat_sector *ls;
+
+    for (ls = fs->sectors; ls; ls = ls->next) {
+	if (ls->n == n)
+	    return ls->data;	/* Found in cache */
+    }
+
+    /* Not found in cache */
+    ls = malloc(sizeof(struct libfat_sector));
+    if (!ls) {
+	libfat_flush(fs);
+	ls = malloc(sizeof(struct libfat_sector));
+
+	if (!ls)
+	    return NULL;	/* Can't allocate memory */
+    }
+
+    if (fs->read(fs->readptr, ls->data, LIBFAT_SECTOR_SIZE, n)
+	!= LIBFAT_SECTOR_SIZE) {
+	free(ls);
+	return NULL;		/* I/O error */
+    }
+
+    ls->n = n;
+    ls->next = fs->sectors;
+    fs->sectors = ls;
+
+    return ls->data;
+}
+
+void libfat_flush(struct libfat_filesystem *fs)
+{
+    struct libfat_sector *ls, *lsnext;
+
+    lsnext = fs->sectors;
+    fs->sectors = NULL;
+
+    for (ls = lsnext; ls; ls = lsnext) {
+	lsnext = ls->next;
+	free(ls);
+    }
+}