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Add LayeredFileSystem

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Alex Barney 2019-01-14 20:37:34 -06:00
parent edaccdfe81
commit b8b57c9fb7
3 changed files with 135 additions and 1 deletions
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3
build/_build.csproj.DotSettings
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89
src/LibHac/IO/LayeredFileSystem.cs Normal file
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using System;
using System.Collections.Generic;
using System.IO;
namespace LibHac.IO
{
public class LayeredFileSystem : IFileSystem
{
private List<IFileSystem> Sources { get; } = new List<IFileSystem>();
public LayeredFileSystem(IList<IFileSystem> sourceFileSystems)
{
Sources.AddRange(sourceFileSystems);
}
public IDirectory OpenDirectory(string path, OpenDirectoryMode mode)
{
path = PathTools.Normalize(path);
var dirs = new List<IDirectory>();
foreach (IFileSystem fs in Sources)
{
if (fs.DirectoryExists(path))
{
dirs.Add(fs.OpenDirectory(path, mode));
}
}
var dir = new LayeredFileSystemDirectory(this, dirs, path, mode);
return dir;
}
public IFile OpenFile(string path, OpenMode mode)
{
path = PathTools.Normalize(path);
foreach (IFileSystem fs in Sources)
{
if (fs.FileExists(path))
{
return fs.OpenFile(path, mode);
}
}
throw new FileNotFoundException();
}
public bool DirectoryExists(string path)
{
path = PathTools.Normalize(path);
foreach (IFileSystem fs in Sources)
{
if (fs.DirectoryExists(path))
{
return true;
}
}
return false;
}
public bool FileExists(string path)
{
path = PathTools.Normalize(path);
foreach (IFileSystem fs in Sources)
{
if (fs.FileExists(path))
{
return true;
}
}
return false;
}
public void Commit() { }
public void CreateDirectory(string path) => throw new NotSupportedException();
public void CreateFile(string path, long size) => throw new NotSupportedException();
public void DeleteDirectory(string path) => throw new NotSupportedException();
public void DeleteFile(string path) => throw new NotSupportedException();
public void RenameDirectory(string srcPath, string dstPath) => throw new NotSupportedException();
public void RenameFile(string srcPath, string dstPath) => throw new NotSupportedException();
}
}

44
src/LibHac/IO/LayeredFileSystemDirectory.cs Normal file
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using System.Collections.Generic;
using System.Linq;
namespace LibHac.IO
{
public class LayeredFileSystemDirectory : IDirectory
{
public IFileSystem ParentFileSystem { get; }
public string FullPath { get; }
public OpenDirectoryMode Mode { get; }
private List<IDirectory> Sources { get; }
public LayeredFileSystemDirectory(IFileSystem fs, List<IDirectory> sources, string path, OpenDirectoryMode mode)
{
ParentFileSystem = fs;
Sources = sources;
FullPath = path;
Mode = mode;
}
public IEnumerable<DirectoryEntry> Read()
{
var returnedFiles = new HashSet<string>();
foreach (IDirectory source in Sources)
{
foreach (DirectoryEntry entry in source.Read())
{
if (returnedFiles.Contains(entry.FullPath)) continue;
returnedFiles.Add(entry.FullPath);
yield return entry;
}
}
}
public int GetEntryCount()
{
return Read().Count();
}
}
}