From f391c9b0eacd77a8fa58a955050f7b9063e547d4 Mon Sep 17 00:00:00 2001
From: Ingo Weinhold <ingo_weinhold@gmx.de>
Date: Mon, 11 Jul 2011 20:32:09 +0200
Subject: [PATCH] Add UnpackingNode::IsOnlyPackageNode()

It returns whether the given package node is the only package node
attached to that node.
---
 .../kernel/file_systems/packagefs/UnpackingDirectory.cpp  | 8 ++++++++
 .../kernel/file_systems/packagefs/UnpackingDirectory.h    | 1 +
 .../kernel/file_systems/packagefs/UnpackingLeafNode.cpp   | 8 ++++++++
 .../kernel/file_systems/packagefs/UnpackingLeafNode.h     | 1 +
 src/add-ons/kernel/file_systems/packagefs/UnpackingNode.h | 1 +
 5 files changed, 19 insertions(+)

diff --git a/src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.cpp b/src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.cpp
index 7c70b523b0..66606aeb04 100644
--- a/src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.cpp
+++ b/src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.cpp
@@ -132,6 +132,14 @@ UnpackingDirectory::GetPackageNode()
 }
 
 
+bool
+UnpackingDirectory::IsOnlyPackageNode(PackageNode* node) const
+{
+	return node == fPackageDirectories.Head()
+		&& node == fPackageDirectories.Tail();
+}
+
+
 status_t
 UnpackingDirectory::OpenAttributeDirectory(AttributeDirectoryCookie*& _cookie)
 {
diff --git a/src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.h b/src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.h
index bb94156e9a..61d73034fc 100644
--- a/src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.h
+++ b/src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.h
@@ -28,6 +28,7 @@ public:
 	virtual	void				RemovePackageNode(PackageNode* packageNode);
 
 	virtual	PackageNode*		GetPackageNode();
+	virtual	bool				IsOnlyPackageNode(PackageNode* node) const;
 
 	virtual	status_t			OpenAttributeDirectory(
 									AttributeDirectoryCookie*& _cookie);
diff --git a/src/add-ons/kernel/file_systems/packagefs/UnpackingLeafNode.cpp b/src/add-ons/kernel/file_systems/packagefs/UnpackingLeafNode.cpp
index 80ca1b96a3..9d671a389b 100644
--- a/src/add-ons/kernel/file_systems/packagefs/UnpackingLeafNode.cpp
+++ b/src/add-ons/kernel/file_systems/packagefs/UnpackingLeafNode.cpp
@@ -156,6 +156,14 @@ UnpackingLeafNode::GetPackageNode()
 }
 
 
+bool
+UnpackingLeafNode::IsOnlyPackageNode(PackageNode* node) const
+{
+	PackageLeafNode* head = fPackageNodes.Head();
+	return node == head && fPackageNodes.GetNext(head) == NULL;
+}
+
+
 status_t
 UnpackingLeafNode::Read(off_t offset, void* buffer, size_t* bufferSize)
 {
diff --git a/src/add-ons/kernel/file_systems/packagefs/UnpackingLeafNode.h b/src/add-ons/kernel/file_systems/packagefs/UnpackingLeafNode.h
index b9ed5de547..e1b8db4340 100644
--- a/src/add-ons/kernel/file_systems/packagefs/UnpackingLeafNode.h
+++ b/src/add-ons/kernel/file_systems/packagefs/UnpackingLeafNode.h
@@ -31,6 +31,7 @@ public:
 	virtual	void				RemovePackageNode(PackageNode* packageNode);
 
 	virtual	PackageNode*		GetPackageNode();
+	virtual	bool				IsOnlyPackageNode(PackageNode* node) const;
 
 	virtual	status_t			Read(off_t offset, void* buffer,
 									size_t* bufferSize);
diff --git a/src/add-ons/kernel/file_systems/packagefs/UnpackingNode.h b/src/add-ons/kernel/file_systems/packagefs/UnpackingNode.h
index f1edd5fe3d..3ac50316c7 100644
--- a/src/add-ons/kernel/file_systems/packagefs/UnpackingNode.h
+++ b/src/add-ons/kernel/file_systems/packagefs/UnpackingNode.h
@@ -23,6 +23,7 @@ public:
 	virtual	void				RemovePackageNode(PackageNode* packageNode) = 0;
 
 	virtual	PackageNode*		GetPackageNode() = 0;
+	virtual	bool				IsOnlyPackageNode(PackageNode* node) const = 0;
 };