20060303a

1 files changed, 35 insertions, 0 deletions

diff --git a/libnandfs/readpageauxilliary.c b/libnandfs/readpageauxilliary.c
new file mode 100644
index 00000000..ba71d2b5
--- /dev/null
+++ b/libnandfs/readpageauxilliary.c
@@ -0,0 +1,35 @@
+#include "lib9.h"
+#include "logfs.h"
+#include "nandfs.h"
+#include "local.h"
+
+static int
+countzeros(uchar byte)
+{
+	int b, count;
+	for (b = 0x80, count = 0; b; b>>= 1)
+		if ((byte & b) == 0)
+			count++;
+	return count;
+}
+
+char *
+nandfsreadpageauxiliary(Nandfs *nandfs, NandfsTags *tags, long block, int page, int correct, LogfsLowLevelReadResult *result)
+{
+	NandfsAuxiliary hdr;
+	char *rv;
+
+	rv = (*nandfs->read)(nandfs->magic, &hdr, sizeof(hdr), nandfs->rawblocksize * (nandfs->baseblock + block) + page * NandfsFullSize + NandfsPageSize);
+	if (rv)
+		return rv;
+	if (countzeros(hdr.blockstatus) > 2) {
+		*result = LogfsLowLevelReadResultBad;
+		return nil;
+	}
+	if (correct)
+		*result = _nandfscorrectauxiliary(&hdr);
+	else
+		*result = LogfsLowLevelReadResultOk;
+	_nandfsextracttags(&hdr, tags);
+	return nil;
+}