patch-2.4.22 linux-2.4.22/fs/hfsplus/brec.c

• Lines: 51
• Date: 2003-08-25 04:44:43.000000000 -0700
• Orig file: linux-2.4.21/fs/hfsplus/brec.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/fs/hfsplus/brec.c linux-2.4.22/fs/hfsplus/brec.c
@@ -0,0 +1,50 @@
+/*
+ *  linux/fs/hfsplus/brec.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handle individual btree records
+ */
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+/* Get the length and offset of the given record in the given node */
+u16 hfsplus_brec_lenoff(hfsplus_bnode *node, u16 rec, u16 *off)
+{
+	u16 retval[2];
+	u16 dataoff;
+
+	dataoff = node->tree->node_size - (rec + 2) * 2;
+	hfsplus_bnode_readbytes(node, retval, dataoff, 4);
+	*off = be16_to_cpu(retval[1]);
+	return be16_to_cpu(retval[0]) - *off;
+}
+
+/* Get the length of the key from a keyed record */
+u16 hfsplus_brec_keylen(hfsplus_bnode *node, u16 rec)
+{
+	u16 klsz, retval, recoff;
+	unsigned char buf[2];
+
+	if ((node->kind != HFSPLUS_NODE_NDX)&&(node->kind != HFSPLUS_NODE_LEAF))
+		return 0;
+
+	klsz = (node->tree->attributes & HFSPLUS_TREE_BIGKEYS) ? 2 : 1;
+	if ((node->kind == HFSPLUS_NODE_NDX) &&
+	   !(node->tree->attributes & HFSPLUS_TREE_VAR_NDXKEY_SIZE)) {
+		retval = node->tree->max_key_len;
+	} else {
+		recoff = hfsplus_bnode_read_u16(node, node->tree->node_size - (rec + 1) * 2);
+		if (!recoff)
+			return 0;
+		hfsplus_bnode_readbytes(node, buf, recoff, klsz);
+		if (klsz == 1)
+			retval = buf[0];
+		else
+			retval = be16_to_cpu(*(u16 *)buf);
+	}
+	return (retval + klsz + 1) & 0xFFFE;
+}