internal static Stream OpenAsyncRead(string fullPath)
{
Debug.Assert(PathUtilities.IsAbsolute(fullPath));
return(RethrowExceptionsAsIOException(() => PortableShim.FileStream.Create(fullPath, PortableShim.FileMode.Open, PortableShim.FileAccess.Read, PortableShim.FileShare.Read, 4096, PortableShim.FileOptions.Asynchronous)));
}
internal static string ResolveRelativePath(string path, string basePath, string baseDirectory)
{
Debug.Assert(baseDirectory == null || PathUtilities.IsAbsolute(baseDirectory));
return(ResolveRelativePath(PathUtilities.GetPathKind(path), path, basePath, baseDirectory));
}
private static string ResolveRelativePath(PathKind kind, string path, string basePath, string baseDirectory)
{
switch (kind)
{
case PathKind.Empty:
return(null);
case PathKind.Relative:
baseDirectory = GetBaseDirectory(basePath, baseDirectory);
if (baseDirectory == null)
{
return(null);
}
// with no search paths relative paths are relative to the base directory:
return(PathUtilities.CombinePathsUnchecked(baseDirectory, path));
case PathKind.RelativeToCurrentDirectory:
baseDirectory = GetBaseDirectory(basePath, baseDirectory);
if (baseDirectory == null)
{
return(null);
}
if (path.Length == 1)
{
// "."
return(baseDirectory);
}
else
{
// ".\path"
return(PathUtilities.CombinePathsUnchecked(baseDirectory, path));
}
case PathKind.RelativeToCurrentParent:
baseDirectory = GetBaseDirectory(basePath, baseDirectory);
if (baseDirectory == null)
{
return(null);
}
// ".."
return(PathUtilities.CombinePathsUnchecked(baseDirectory, path));
case PathKind.RelativeToCurrentRoot:
string baseRoot;
if (basePath != null)
{
baseRoot = PathUtilities.GetPathRoot(basePath);
}
else if (baseDirectory != null)
{
baseRoot = PathUtilities.GetPathRoot(baseDirectory);
}
else
{
return(null);
}
if (string.IsNullOrEmpty(baseRoot))
{
return(null);
}
Debug.Assert(PathUtilities.IsDirectorySeparator(path[0]));
Debug.Assert(path.Length == 1 || !PathUtilities.IsDirectorySeparator(path[1]));
return(PathUtilities.CombinePathsUnchecked(baseRoot, path.Substring(1)));
case PathKind.RelativeToDriveDirectory:
// drive relative paths not supported, can't resolve:
return(null);
case PathKind.Absolute:
return(path);
default:
throw ExceptionUtilities.UnexpectedValue(kind);
}
}