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Add OpenDir method to IReadOnlyFilesystem.

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This commit is contained in:
Natalia Portillo
2022-12-21 19:10:51 +00:00
parent 63c961c269
commit c75a32a5c8
19 changed files with 939 additions and 4 deletions
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110
Aaru.Filesystems/ISO9660/Dir.cs
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@@ -34,6 +34,7 @@ using System.IO;
using System.Linq;
using System.Text;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interfaces;
using Aaru.Helpers;
namespace Aaru.Filesystems;
@@ -42,6 +43,112 @@ public sealed partial class ISO9660
{
Dictionary<string, Dictionary<string, DecodedDirectoryEntry>> _directoryCache;
/// <inheritdoc />
public ErrorNumber OpenDir(string path, out IDirNode node)
{
node = null;
if(!_mounted)
return ErrorNumber.AccessDenied;
if(string.IsNullOrWhiteSpace(path) ||
path == "/")
{
node = new Iso9660DirNode
{
Path = path,
_position = 0,
_entries = _rootDirectoryCache.Values.ToArray()
};
return ErrorNumber.NoError;
}
string cutPath = path.StartsWith("/", StringComparison.Ordinal)
? path[1..].ToLower(CultureInfo.CurrentUICulture)
: path.ToLower(CultureInfo.CurrentUICulture);
if(_directoryCache.TryGetValue(cutPath, out Dictionary<string, DecodedDirectoryEntry> currentDirectory))
{
node = new Iso9660DirNode
{
Path = path,
_position = 0,
_entries = currentDirectory.Values.ToArray()
};
return ErrorNumber.NoError;
}
string[] pieces = cutPath.Split(new[]
{
'/'
}, StringSplitOptions.RemoveEmptyEntries);
KeyValuePair<string, DecodedDirectoryEntry> entry =
_rootDirectoryCache.FirstOrDefault(t => t.Key.ToLower(CultureInfo.CurrentUICulture) == pieces[0]);
if(string.IsNullOrEmpty(entry.Key))
return ErrorNumber.NoSuchFile;
if(!entry.Value.Flags.HasFlag(FileFlags.Directory))
return ErrorNumber.NotDirectory;
string currentPath = pieces[0];
currentDirectory = _rootDirectoryCache;
for(int p = 0; p < pieces.Length; p++)
{
entry = currentDirectory.FirstOrDefault(t => t.Key.ToLower(CultureInfo.CurrentUICulture) == pieces[p]);
if(string.IsNullOrEmpty(entry.Key))
return ErrorNumber.NoSuchFile;
if(!entry.Value.Flags.HasFlag(FileFlags.Directory))
return ErrorNumber.NotDirectory;
currentPath = p == 0 ? pieces[0] : $"{currentPath}/{pieces[p]}";
if(_directoryCache.TryGetValue(currentPath, out currentDirectory))
continue;
if(entry.Value.Extents.Count == 0)
return ErrorNumber.InvalidArgument;
currentDirectory = _cdi
? DecodeCdiDirectory(entry.Value.Extents[0].extent + entry.Value.XattrLength,
entry.Value.Extents[0].size)
: _highSierra
? DecodeHighSierraDirectory(entry.Value.Extents[0].extent + entry.Value.XattrLength,
entry.Value.Extents[0].size)
: DecodeIsoDirectory(entry.Value.Extents[0].extent + entry.Value.XattrLength,
entry.Value.Extents[0].size);
if(_usePathTable)
foreach(DecodedDirectoryEntry subDirectory in _cdi
? GetSubdirsFromCdiPathTable(currentPath)
: _highSierra
? GetSubdirsFromHighSierraPathTable(currentPath)
: GetSubdirsFromIsoPathTable(currentPath))
currentDirectory[subDirectory.Filename] = subDirectory;
_directoryCache.Add(currentPath, currentDirectory);
}
if(currentDirectory is null)
return ErrorNumber.NoSuchFile;
node = new Iso9660DirNode
{
Path = path,
_position = 0,
_entries = currentDirectory.Values.ToArray()
};
return ErrorNumber.NoError;
}
/// <inheritdoc />
public ErrorNumber ReadDir(string path, out List<string> contents)
{
@@ -983,7 +1090,8 @@ public sealed partial class ISO9660
errno = ReadSingleExtent(ca.offset, ca.ca_length, ca.block, out byte[] caData);
// TODO: Check continuation area definition, this is not a proper fix
if(errno == ErrorNumber.NoError && caData.Length > 0)
if(errno == ErrorNumber.NoError &&
caData.Length > 0)
DecodeSystemArea(caData, 0, (int)ca.ca_length, ref entry, out hasResourceFork);
systemAreaOff += ceLength;