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(VFS.FullPath): do not rebuild hierarchy when new path is almost identical.

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This commit is contained in:
morkt 2015-09-02 02:57:36 +04:00
parent 4d48b25512
commit 5dcbcd76c9
1 changed files with 41 additions and 6 deletions
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39
GameRes/FileSystem.cs
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@ -458,7 +458,7 @@ namespace GameRes
m_arc_name_stack.Push (path);
}
private void Pop ()
internal void Pop ()
{
if (m_fs_stack.Count > 1)
{
@ -500,10 +500,26 @@ namespace GameRes
{
private static FileSystemStack m_vfs = new FileSystemStack();
/// <summary>
/// Top, or "current" filesystem in VFS hierarchy.
/// </summary>
public static IFileSystem Top { get { return m_vfs.Top; } }
/// <summary>
/// Whether top filesystem is virtual (i.e. represents an archive).
/// </summary>
public static bool IsVirtual { get { return m_vfs.Count > 1; } }
/// <summary>
/// Number of filesystems in hierarchy. ==1 when only physical file system is represented.
/// Always >= 1
/// </summary>
public static int Count { get { return m_vfs.Count; } }
/// <summary>
/// Archive corresponding to the top filesystem, or null if file system doesn't have underlying
/// archive file.
/// </summary>
public static ArcFile CurrentArchive { get { return m_vfs.CurrentArchive; } }
private static string[] m_top_path = new string[1];
@ -522,12 +538,31 @@ namespace GameRes
{
if (!value.Any())
return;
var new_vfs = new FileSystemStack();
var desired = value.ToArray();
if (desired.Length == Count)
{
var cur_stack = m_vfs.ArcStack.Reverse();
if (1 == Count || cur_stack.SequenceEqual (desired.Take (desired.Length-1)))
{
// desired path is identical to current, adjust final component only
m_vfs.Top.CurrentDirectory = desired.Last();
return;
}
}
// desired path is different, rebuild filesystem hierarchy from scratch
var new_vfs = new FileSystemStack();
try
{
for (int i = 0; i < desired.Length-1; ++i)
new_vfs.ChDir (new_vfs.Top.FindFile (desired[i]));
new_vfs.Top.CurrentDirectory = desired.Last();
m_vfs.Dispose();
}
catch
{
new_vfs.Dispose();
throw;
}
m_vfs = new_vfs;
}
}