hfs-522.100.5.tar.gz

[apple/hfs.git] / core / hfs_extents.h

diff --git a/core/hfs_extents.h b/core/hfs_extents.h
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+/*
+ * Copyright (c) 2014-2015 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#ifndef HFS_EXTENTS_H_
+#define HFS_EXTENTS_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "hfs_format.h"
+
+#if !HFS_EXTENTS_TEST && !HFS_ALLOC_TEST
+#include "hfs_cnode.h"
+#include "hfs.h"
+#include "BTreesInternal.h"
+#endif
+
+typedef struct hfs_ext_iter {
+       struct vnode               *vp;                 // If NULL, this is an xattr extent
+       BTreeIterator                   bt_iter;
+       uint8_t                                 ndx;            // Index in group
+       bool                                    last_in_fork;
+       uint32_t                                file_block;
+       uint32_t                                group_block_count;
+       HFSPlusExtentRecord             group;
+} hfs_ext_iter_t;
+
+errno_t hfs_ext_find(vnode_t vp, off_t offset, hfs_ext_iter_t *iter);
+
+errno_t hfs_ext_replace(hfsmount_t *hfsmp, vnode_t vp,
+                                               uint32_t file_block,
+                                               const HFSPlusExtentDescriptor *repl,
+                                               int count,
+                                               HFSPlusExtentRecord catalog_extents);
+
+bool hfs_ext_iter_is_catalog_extents(hfs_ext_iter_t *iter);
+
+static inline void hfs_ext_copy_rec(const HFSPlusExtentRecord src,
+                                                                       HFSPlusExtentRecord dst)
+{
+       memcpy(dst, src, sizeof(HFSPlusExtentRecord));
+}
+
+static inline uint32_t hfs_ext_end(const HFSPlusExtentDescriptor *ext)
+{
+       return ext->startBlock + ext->blockCount;
+}
+
+#endif // HFS_EXTENTS_H_