Skip to content

PFS: skip indirect block signatures and chunk files by block size #23

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
kiwidoggie merged 1 commit into from
Nov 13, 2025
Merged

PFS: skip indirect block signatures and chunk files by block size #23

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 10 additions & 4 deletions LibOrbisPkg/PFS/PfsReader.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -65,25 +65,27 @@ public IEnumerable<File> GetAllFiles()
/// </summary>
public class File : Node
{
public InodeFlags flags;
public int blockSize;
public int[] blocks;
private IMemoryReader reader;
public File(IMemoryReader r) { reader = r; }
public IMemoryReader GetView()
{
if (blocks != null)
return new ChunkedMemoryReader(reader, 0x10000, blocks);
return new ChunkedMemoryReader(reader, blockSize, blocks);
return new MemoryAccessor(reader, offset);
}
public void Save(string path, bool decompress = false)
{
var buf = new byte[0x10000];
var buf = new byte[blockSize];
using (var file = System.IO.File.OpenWrite(path))
{
var sz = size;
file.SetLength(sz);
long pos = 0;
var reader = GetView();
if (decompress && size != compressed_size)
if (decompress && flags.HasFlag(InodeFlags.compressed))
{
sz = compressed_size;
reader = new PFSCReader(reader);
Expand Down Expand Up @@ -157,9 +159,11 @@ public PfsReader(IMemoryReader r, ulong pfs_flags = 0, byte[] ekpfs = null, byte
var maxPerSector = hdr.BlockSize / dinodeSize;
sectorBuf = new byte[hdr.BlockSize];
sectorStream = new MemoryStream(sectorBuf);
// skip over indirect blocks, block signatures are never checked anyway
var dinodeStartPos = hdr.BlockSize + (hdr.BlockSize * hdr.InodeBlockSig.IndirectBlocks.Where(b => b > 0).Count());
for (var i = 0; i < hdr.DinodeBlockCount; i++)
{
var position = hdr.BlockSize + hdr.BlockSize * i;
var position = dinodeStartPos + (hdr.BlockSize * i);
reader.Read(position, sectorBuf, 0, sectorBuf.Length);
sectorStream.Position = 0;
for (var j = 0; j < maxPerSector && total < hdr.DinodeCount; j++)
Expand Down Expand Up @@ -297,6 +301,8 @@ private File LoadFile(uint dinode, Dir parent, string name)
compressed_size = dinodes[dinode].SizeCompressed,
ino = dinode,
blocks = blocks,
flags = dinodes[dinode].Flags,
blockSize = (int)hdr.BlockSize
};
}
}
Expand Down