public int ReadFrom(byte[] buffer, int offset)
{
Magic = EndianUtilities.ToUInt32LittleEndian(buffer, offset + 0);
if (Magic != SquashFsMagic)
{
return(Size);
}
InodesCount = EndianUtilities.ToUInt32LittleEndian(buffer, offset + 4);
CreationTime = ((long)EndianUtilities.ToUInt32LittleEndian(buffer, offset + 8)).FromUnixTimeSeconds().DateTime;
BlockSize = EndianUtilities.ToUInt32LittleEndian(buffer, offset + 12);
FragmentsCount = EndianUtilities.ToUInt32LittleEndian(buffer, offset + 16);
Compression = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 20);
BlockSizeLog2 = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 22);
Flags = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 24);
UidGidCount = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 26);
MajorVersion = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 28);
MinorVersion = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 30);
RootInode = new MetadataRef(EndianUtilities.ToInt64LittleEndian(buffer, offset + 32));
BytesUsed = EndianUtilities.ToInt64LittleEndian(buffer, offset + 40);
UidGidTableStart = EndianUtilities.ToInt64LittleEndian(buffer, offset + 48);
ExtendedAttrsTableStart = EndianUtilities.ToInt64LittleEndian(buffer, offset + 56);
InodeTableStart = EndianUtilities.ToInt64LittleEndian(buffer, offset + 64);
DirectoryTableStart = EndianUtilities.ToInt64LittleEndian(buffer, offset + 72);
FragmentTableStart = EndianUtilities.ToInt64LittleEndian(buffer, offset + 80);
LookupTableStart = EndianUtilities.ToInt64LittleEndian(buffer, offset + 88);
return(Size);
}
public Directory(Context context, Inode inode, MetadataRef inodeRef)
: base(context, inode, inodeRef)
{
_dirInode = inode as IDirectoryInode;
if (_dirInode == null)
{
throw new ArgumentException("Inode is not a directory", nameof(inode));
}
}
protected override File ConvertDirEntryToFile(DirectoryEntry dirEntry)
{
MetadataRef inodeRef = dirEntry.InodeReference;
_context.InodeReader.SetPosition(inodeRef);
Inode inode = Inode.Read(_context.InodeReader);
if (dirEntry.IsSymlink)
{
return(new Symlink(_context, inode, inodeRef));
}
if (dirEntry.IsDirectory)
{
return(new Directory(_context, inode, inodeRef));
}
return(new File(_context, inode, inodeRef));
}
public FileContentBuffer(Context context, RegularInode inode, MetadataRef inodeRef)
{
_context = context;
_inode = inode;
context.InodeReader.SetPosition(inodeRef);
context.InodeReader.Skip(_inode.Size);
int numBlocks = (int)(_inode.FileSize / _context.SuperBlock.BlockSize);
if (_inode.FileSize % _context.SuperBlock.BlockSize != 0 && _inode.FragmentKey == InvalidFragmentKey)
{
++numBlocks;
}
byte[] lengthData = new byte[numBlocks * 4];
context.InodeReader.Read(lengthData, 0, lengthData.Length);
_blockLengths = new int[numBlocks];
for (int i = 0; i < numBlocks; ++i)
{
_blockLengths[i] = Utilities.ToInt32LittleEndian(lengthData, i * 4);
}
}
public int ReadFrom(byte[] buffer, int offset)
{
Magic = Utilities.ToUInt32LittleEndian(buffer, offset + 0);
InodesCount = Utilities.ToUInt32LittleEndian(buffer, offset + 4);
CreationTime = Utilities.DateTimeFromUnix(Utilities.ToUInt32LittleEndian(buffer, offset + 8));
BlockSize = Utilities.ToUInt32LittleEndian(buffer, offset + 12);
FragmentsCount = Utilities.ToUInt32LittleEndian(buffer, offset + 16);
Compression = Utilities.ToUInt16LittleEndian(buffer, offset + 20);
BlockSizeLog2 = Utilities.ToUInt16LittleEndian(buffer, offset + 22);
Flags = Utilities.ToUInt16LittleEndian(buffer, offset + 24);
UidGidCount = Utilities.ToUInt16LittleEndian(buffer, offset + 26);
MajorVersion = Utilities.ToUInt16LittleEndian(buffer, offset + 28);
MinorVersion = Utilities.ToUInt16LittleEndian(buffer, offset + 30);
RootInode = new MetadataRef(Utilities.ToInt64LittleEndian(buffer, offset + 32));
BytesUsed = Utilities.ToInt64LittleEndian(buffer, offset + 40);
UidGidTableStart = Utilities.ToInt64LittleEndian(buffer, offset + 48);
ExtendedAttrsTableStart = Utilities.ToInt64LittleEndian(buffer, offset + 56);
InodeTableStart = Utilities.ToInt64LittleEndian(buffer, offset + 64);
DirectoryTableStart = Utilities.ToInt64LittleEndian(buffer, offset + 72);
FragmentTableStart = Utilities.ToInt64LittleEndian(buffer, offset + 80);
LookupTableStart = Utilities.ToInt64LittleEndian(buffer, offset + 88);
return Size;
}
public FileContentBuffer(Context context, RegularInode inode, MetadataRef inodeRef)
{
_context = context;
_inode = inode;
context.InodeReader.SetPosition(inodeRef);
context.InodeReader.Skip(_inode.Size);
int numBlocks = (int)(_inode.FileSize / _context.SuperBlock.BlockSize);
if (_inode.FileSize % _context.SuperBlock.BlockSize != 0 && _inode.FragmentKey == InvalidFragmentKey)
{
++numBlocks;
}
byte[] lengthData = new byte[numBlocks * 4];
context.InodeReader.Read(lengthData, 0, lengthData.Length);
_blockLengths = new int[numBlocks];
for (int i = 0; i < numBlocks; ++i)
{
_blockLengths[i] = Utilities.ToInt32LittleEndian(lengthData, i * 4);
}
}
public void SetPosition(MetadataRef position)
{
SetPosition(position.Block, position.Offset);
}
internal long DistanceFrom(MetadataRef startPos)
{
return((_currentBlockNum - startPos.Block) * VfsSquashFileSystemReader.MetadataBufferSize
+ (_currentOffset - startPos.Offset));
}
public File(Context context, Inode inode, MetadataRef inodeRef)
{
Context = context;
Inode = inode;
_inodeRef = inodeRef;
}
public Symlink(Context context, Inode inode, MetadataRef inodeRef)
: base(context, inode, inodeRef)
{
}
public void SetPosition(MetadataRef position)
{
SetPosition(position.Block, position.Offset);
}
internal long DistanceFrom(MetadataRef startPos)
{
return ((_currentBlockNum - startPos.Block) * VfsSquashFileSystemReader.MetadataBufferSize)
+ (_currentOffset - startPos.Offset);
}
private void WriteDirectory(BuilderContext context)
{
MetadataRef startPos = context.DirectoryWriter.Position;
int currentChild = 0;
int numDirs = 0;
while (currentChild < _children.Count)
{
long thisBlock = _children[currentChild].Node.InodeRef.Block;
int firstInode = _children[currentChild].Node.InodeNumber;
int count = 1;
while (currentChild + count < _children.Count &&
_children[currentChild + count].Node.InodeRef.Block == thisBlock &&
_children[currentChild + count].Node.InodeNumber - firstInode < 0x7FFF)
{
++count;
}
DirectoryHeader hdr = new DirectoryHeader()
{
Count = count - 1,
InodeNumber = firstInode,
StartBlock = (int)thisBlock
};
hdr.WriteTo(context.IoBuffer, 0);
context.DirectoryWriter.Write(context.IoBuffer, 0, hdr.Size);
for (int i = 0; i < count; ++i)
{
Entry child = _children[currentChild + i];
DirectoryRecord record = new DirectoryRecord()
{
Offset = (ushort)child.Node.InodeRef.Offset,
InodeNumber = (short)(child.Node.InodeNumber - firstInode),
Type = child.Node.Inode.Type,
Name = child.Name
};
record.WriteTo(context.IoBuffer, 0);
context.DirectoryWriter.Write(context.IoBuffer, 0, record.Size);
if (child.Node.Inode.Type == InodeType.Directory ||
child.Node.Inode.Type == InodeType.ExtendedDirectory)
{
++numDirs;
}
}
currentChild += count;
}
long size = context.DirectoryWriter.DistanceFrom(startPos);
if (size > uint.MaxValue)
{
throw new NotImplementedException("Writing large directories");
}
NumLinks = numDirs + 2; // +1 for self, +1 for parent
_inode.StartBlock = (uint)startPos.Block;
_inode.Offset = (ushort)startPos.Offset;
_inode.FileSize = (uint)size + 3; // For some reason, always +3
}
public File(Context context, Inode inode, MetadataRef inodeRef)
{
_context = context;
_inode = inode;
_inodeRef = inodeRef;
}
