Rename: include/bitmap.h -> include/ntfs/bitmap.h

(Logical change 1.280)
2004-02-25 14:21:14 +00:00 · 2004-02-25 14:21:14 +00:00 · d87fde8436
parent 37b43614ab
commit d87fde8436
1 changed files with 107 additions and 0 deletions
--- a/include/ntfs/bitmap.h
+++ b/include/ntfs/bitmap.h
@ -0,0 +1,107 @@
+/*
+ * bitmap.h - Exports for bitmap handling. Part of the Linux-NTFS project.
+ *
+ * Copyright (c) 2000-2003 Anton Altaparmakov
+ *
+ * This program/include file 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program/include file is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (in the main directory of the Linux-NTFS
+ * distribution in the file COPYING); if not, write to the Free Software
+ * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _NTFS_BITMAP_H
+#define _NTFS_BITMAP_H
+
+#include "types.h"
+#include "attrib.h"
+
+/*
+ * NOTES:
+ *
+ * - Operations are 8-bit only to ensure the functions work both on little
+ *   and big endian machines! So don't make them 32-bit ops!
+ * - bitmap starts at bit = 0 and ends at bit = bitmap size - 1.
+ * - _Caller_ has to make sure that the bit to operate on is less than the
+ *   size of the bitmap.
+ */
+
+/**
+ * ntfs_bit_set - set a bit in a field of bits
+ * @bitmap:	field of bits
+ * @bit:	bit to set
+ * @new_value:	value to set bit to (0 or 1)
+ *
+ * Set the bit @bit in the @bitmap to @new_value. Ignore all errors.
+ */
+static __inline__ void ntfs_bit_set(u8 *bitmap, const u64 bit,
+		const u8 new_value)
+{
+//	Dprintf("bitmap %p, bit 0x%llx, new_value %i\n", bitmap, bit, new_value);
+	if (!bitmap || new_value > 1)
+		return;
+	if (!new_value)
+		bitmap[bit >> 3] &= ~(1 << (bit & 7));
+	else
+		bitmap[bit >> 3] |= (1 << (bit & 7));
+}
+
+/**
+ * ntfs_bit_get - get value of a bit in a field of bits
+ * @bitmap:	field of bits
+ * @bit:	bit to get
+ *
+ * Get and return the value of the bit @bit in @bitmap (0 or 1).
+ * Return -1 on error.
+ */
+static __inline__ char ntfs_bit_get(const u8 *bitmap, const u64 bit)
+{
+	if (!bitmap)
+		return -1;
+	return (bitmap[bit >> 3] >> (bit & 7)) & 1;
+}
+
+static __inline__ void ntfs_bit_change(u8 *bitmap, const u64 bit)
+{
+	if (!bitmap)
+		return;
+	bitmap[bit >> 3] ^= 1 << (bit & 7);
+}
+
+/**
+ * ntfs_bit_get_and_set - get value of a bit in a field of bits and set it
+ * @bitmap:	field of bits
+ * @bit:	bit to get/set
+ * @new_value:	value to set bit to (0 or 1)
+ *
+ * Return the value of the bit @bit and set it to @new_value (0 or 1).
+ * Return -1 on error.
+ */
+static __inline__ char ntfs_bit_get_and_set(u8 *bitmap, const u64 bit,
+		const u8 new_value)
+{
+	register u8 old_bit, shift;
+
+	if (!bitmap || new_value > 1)
+		return -1;
+	shift = bit & 7;
+	old_bit = (bitmap[bit >> 3] >> shift) & 1;
+	if (new_value != old_bit)
+		bitmap[bit >> 3] ^= 1 << shift;
+	return old_bit;
+}
+
+extern int ntfs_bitmap_set_run(ntfs_attr *na, s64 start_bit, s64 count);
+extern int ntfs_bitmap_clear_run(ntfs_attr *na, s64 start_bit, s64 count);
+
+#endif /* defined _NTFS_BITMAP_H */
+