1 files changed, 33 insertions, 0 deletions
diff --git a/libnandfs/writepageauxilliary.c b/libnandfs/writepageauxilliary.c
new file mode 100644
index 00000000..6d2d6b87
--- /dev/null
+++ b/libnandfs/writepageauxilliary.c
@@ -0,0 +1,33 @@
+#include "lib9.h"
+#include "logfs.h"
+#include "nandfs.h"
+#include "local.h"
+
+/*
+ * update the tags in a page's auxiliary area
+ * only touch the fields if they contain some zeros, and compute the hamming codes
+ * as well
+ */
+
+char *
+nandfswritepageauxiliary(Nandfs *nandfs, NandfsTags *tags, long absblock, int page)
+{
+	NandfsAuxiliary hdr;
+	ulong tmp;
+	ushort htmp;
+
+	memset(&hdr, 0xff, sizeof(hdr));
+	if (tags->path < NandfsPathMask) {
+		tmp = _nandfshamming31_26calc((tags->path << 6)) | (1 << 5);
+		putbig4(hdr.parth, tmp);
+	}
+	if (tags->nerase < NandfsNeraseMask || tags->magic != 0xff) {
+		tmp = _nandfshamming31_26calc((tags->magic << 24) | (tags->nerase << 6)) | (1 << 5);
+		htmp = tmp >> 16;
+		putbig2(hdr.nerasemagicmsw, htmp);
+		putbig2(hdr.nerasemagiclsw, tmp);
+	}
+	if  (tags->tag != 0xff)
+		hdr.tag = tags->tag;
+	return (*nandfs->write)(nandfs->magic, &hdr, sizeof(hdr), nandfs->rawblocksize * absblock + page * NandfsFullSize + NandfsPageSize);
+}