1 files changed, 64 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/libfat/searchdir.c b/contrib/syslinux-4.02/libfat/searchdir.c
new file mode 100644
index 0000000..4964120
--- /dev/null
+++ b/contrib/syslinux-4.02/libfat/searchdir.c
@@ -0,0 +1,64 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * searchdir.c
+ *
+ * Search a FAT directory for a particular pre-mangled filename.
+ * Copies the directory entry into direntry and returns the starting cluster
+ * if found; returns -2 on not found, -1 on error, 0 on empty file.
+ */
+
+#include <string.h>
+#include "libfatint.h"
+
+int32_t libfat_searchdir(struct libfat_filesystem *fs, int32_t dirclust,
+			 const void *name, struct libfat_direntry *direntry)
+{
+    struct fat_dirent *dep;
+    int nent;
+    libfat_sector_t s = libfat_clustertosector(fs, dirclust);
+
+    while (1) {
+	if (s == 0)
+	    return -2;		/* Not found */
+	else if (s == (libfat_sector_t) - 1)
+	    return -1;		/* Error */
+
+	dep = libfat_get_sector(fs, s);
+	if (!dep)
+	    return -1;		/* Read error */
+
+	for (nent = 0; nent < LIBFAT_SECTOR_SIZE;
+	     nent += sizeof(struct fat_dirent)) {
+	    if (!memcmp(dep->name, name, 11)) {
+		if (direntry) {
+		    memcpy(direntry->entry, dep, sizeof(*dep));
+		    direntry->sector = s;
+		    direntry->offset = nent;
+		}
+		if (read32(&dep->size) == 0)
+		    return 0;	/* An empty file has no clusters */
+		else
+		    return read16(&dep->clustlo) +
+			(read16(&dep->clusthi) << 16);
+	    }
+
+	    if (dep->name[0] == 0)
+		return -2;	/* Hit high water mark */
+
+	    dep++;
+	}
+
+	s = libfat_nextsector(fs, s);
+    }
+}