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[UFS] Implement readlink.

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Natalia Portillo
2026-03-10 21:05:12 +00:00
parent 7921129bf8
commit 89fbd6112c
2 changed files with 104 additions and 4 deletions
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104
Aaru.Filesystems/UFS/File.cs
View File

@@ -291,4 +291,108 @@ public sealed partial class UFSPlugin
return ErrorNumber.NoError;
}
/// <inheritdoc />
public ErrorNumber ReadLink(string path, out string dest)
{
dest = null;
if(!_mounted) return ErrorNumber.AccessDenied;
ErrorNumber errno = ResolvePath(path, out uint inodeNumber);
if(errno != ErrorNumber.NoError) return errno;
if(_superBlock.fs_isUfs2)
{
errno = ReadInode2(inodeNumber, out Inode2 inode);
if(errno != ErrorNumber.NoError) return errno;
// Must be a symlink
if((inode.di_mode & 0xF000) != 0xA000) return ErrorNumber.InvalidArgument;
// Fast symlink: target stored inline in di_db/di_ib area
if((long)inode.di_size <= _superBlock.fs_maxsymlinklen && _superBlock.fs_maxsymlinklen > 0)
{
// di_db (12 * 8 = 96 bytes) + di_ib (3 * 8 = 24 bytes) = 120 bytes
var linkData = new byte[inode.di_size];
var offset = 0;
for(var i = 0; i < NDADDR && offset < linkData.Length; i++)
{
byte[] blockBytes = BitConverter.GetBytes(inode.di_db[i]);
int toCopy = Math.Min(blockBytes.Length, linkData.Length - offset);
Array.Copy(blockBytes, 0, linkData, offset, toCopy);
offset += toCopy;
}
for(var i = 0; i < NIADDR && offset < linkData.Length; i++)
{
byte[] blockBytes = BitConverter.GetBytes(inode.di_ib[i]);
int toCopy = Math.Min(blockBytes.Length, linkData.Length - offset);
Array.Copy(blockBytes, 0, linkData, offset, toCopy);
offset += toCopy;
}
dest = _encoding.GetString(linkData).TrimEnd('\0');
return ErrorNumber.NoError;
}
// Slow symlink: read from data blocks
errno = ReadInodeData(inodeNumber, 0, (long)inode.di_size, out byte[] data);
if(errno != ErrorNumber.NoError) return errno;
dest = _encoding.GetString(data).TrimEnd('\0');
return ErrorNumber.NoError;
}
else
{
errno = ReadInode(inodeNumber, out Inode inode);
if(errno != ErrorNumber.NoError) return errno;
if((inode.di_mode & 0xF000) != 0xA000) return ErrorNumber.InvalidArgument;
// Fast symlink: target stored inline in di_db/di_ib area
if((long)inode.di_size <= _superBlock.fs_maxsymlinklen && _superBlock.fs_maxsymlinklen > 0)
{
// di_db (12 * 4 = 48 bytes) + di_ib (3 * 4 = 12 bytes) = 60 bytes
var linkData = new byte[inode.di_size];
var offset = 0;
for(var i = 0; i < NDADDR && offset < linkData.Length; i++)
{
byte[] blockBytes = BitConverter.GetBytes(inode.di_db[i]);
int toCopy = Math.Min(blockBytes.Length, linkData.Length - offset);
Array.Copy(blockBytes, 0, linkData, offset, toCopy);
offset += toCopy;
}
for(var i = 0; i < NIADDR && offset < linkData.Length; i++)
{
byte[] blockBytes = BitConverter.GetBytes(inode.di_ib[i]);
int toCopy = Math.Min(blockBytes.Length, linkData.Length - offset);
Array.Copy(blockBytes, 0, linkData, offset, toCopy);
offset += toCopy;
}
dest = _encoding.GetString(linkData).TrimEnd('\0');
return ErrorNumber.NoError;
}
// Slow symlink: read from data blocks
errno = ReadInodeData(inodeNumber, 0, (long)inode.di_size, out byte[] data);
if(errno != ErrorNumber.NoError) return errno;
dest = _encoding.GetString(data).TrimEnd('\0');
return ErrorNumber.NoError;
}
}
}

4
Aaru.Filesystems/UFS/Unimplemented.cs
View File

@@ -26,7 +26,6 @@
// Copyright © 2011-2026 Natalia Portillo
// ****************************************************************************/
using System;
using System.Collections.Generic;
using Aaru.CommonTypes.Enums;
@@ -51,7 +50,4 @@ public sealed partial class UFSPlugin
return ErrorNumber.NotSupported;
}
/// <inheritdoc />
public ErrorNumber ReadLink(string path, out string dest) => throw new NotImplementedException();
}