protected BlockGroupDescriptor GetGroupDescriptor(UInt32 block_group_id)
{
Byte[] block = new Byte[BlockSize];
const uint gd_entry_size = 32;
Int64 containing_block_id = block_group_id / (BlockSize / gd_entry_size);
block_group_id = block_group_id % (BlockSize / gd_entry_size);
if (BlockSize == 1024)
{
ReadBlock(block, 2 + containing_block_id);
}
else
{
ReadBlock(block, 1 + containing_block_id);
}
BlockGroupDescriptor descriptor = new BlockGroupDescriptor();
Utils.LoadLE32(out descriptor.block_bitmap_id, block, block_group_id * gd_entry_size + 0);
Utils.LoadLE32(out descriptor.inode_bitmap_id, block, block_group_id * gd_entry_size + 4);
Utils.LoadLE32(out descriptor.inode_table_id, block, block_group_id * gd_entry_size + 8);
Utils.LoadLE16(out descriptor.free_blocks_count, block, block_group_id * gd_entry_size + 12);
Utils.LoadLE16(out descriptor.free_inodes_count, block, block_group_id * gd_entry_size + 14);
Utils.LoadLE16(out descriptor.dir_count, block, block_group_id * gd_entry_size + 16);
return(descriptor);
}
/// <summary>
/// The ProcessRecord method instantiates a Superblock object based
/// on the disk given as an argument.
/// </summary>
protected override void ProcessRecord()
{
#region MBR
MasterBootRecord mbr = MasterBootRecord.Get(devicePath);
uint superblockOffset = 0;
foreach (PartitionEntry partition in mbr.PartitionTable)
{
if (partition.Bootable && partition.SystemID == "LINUX")
{
superblockOffset = partition.StartSector;
}
}
#endregion MBR
// Obtain a handle to the device named "devicePath"
IntPtr hDevice = NativeMethods.getHandle(devicePath);
using (FileStream streamToRead = NativeMethods.getFileStream(hDevice))
{
// Get Superblock to understand File System Layout
Superblock superBlock = new Superblock(Superblock.GetBytes(streamToRead, superblockOffset));
if (this.MyInvocation.BoundParameters.ContainsKey("GroupNumber"))
{
if (asbytes)
{
WriteObject(BlockGroupDescriptor.GetBytes(streamToRead, superblockOffset, superBlock, number));
}
else
{
WriteObject(new BlockGroupDescriptor(BlockGroupDescriptor.GetBytes(streamToRead, superblockOffset, superBlock, number)));
}
}
else
{
if (asbytes)
{
BlockGroupDescriptorTable.GetBytes(streamToRead, superblockOffset, superBlock);
}
else
{
byte[] bgdtBytes = BlockGroupDescriptorTable.GetBytes(streamToRead, superblockOffset, superBlock);
for (uint o = 0; o < bgdtBytes.Length; o += BlockGroupDescriptor.BLOCK_GROUP_DESCRIPTOR_LENGTH)
{
WriteObject(new BlockGroupDescriptor(NativeMethods.GetSubArray(bgdtBytes, o, BlockGroupDescriptor.BLOCK_GROUP_DESCRIPTOR_LENGTH)));
}
}
}
}
}
public INode GetINode(UInt32 inode_number)
{
INode inode = new INode();
inode.inode = inode_number;
inode_number--;
BlockGroupDescriptor block_group_descriptor = bg_descriptors[(int)(inode_number / inodes_per_group)];
Byte[] block = new Byte[BlockSize];
uint inodes_per_block = BlockSize / inode_size;
uint inode_number_in_bg = inode_number % inodes_per_group;
uint inode_block_index = inode_number_in_bg / inodes_per_block;
uint inode_offset = (inode_number_in_bg % inodes_per_block) * inode_size;
ReadBlock(block, block_group_descriptor.inode_table_id + inode_block_index);
Utils.LoadLE16(out inode.mode, block, inode_offset + 0);
Utils.LoadLE16(out inode.uid, block, inode_offset + 2);
Utils.LoadLE32To64(out inode.size, block, inode_offset + 108); // top 32 bits
inode.size *= 0x100000000; // << 32
UInt32 temp;
Utils.LoadLE32(out temp, block, inode_offset + 4); // bottom 32 bits
inode.size += temp;
Utils.LoadLE32(out inode.atime, block, inode_offset + 8);
Utils.LoadLE32(out inode.ctime, block, inode_offset + 12);
Utils.LoadLE32(out inode.mtime, block, inode_offset + 16);
Utils.LoadLE32(out inode.dtime, block, inode_offset + 20);
Utils.LoadLE16(out inode.gid, block, inode_offset + 24);
Utils.LoadLE16(out inode.link_count, block, inode_offset + 26);
Utils.LoadLE32To64(out inode.sector_count, block, inode_offset + 28);
Utils.LoadLE32(out inode.flags, block, inode_offset + 32);
for (UInt32 i = 0; i < inode.block.Length; i++)
{
Utils.LoadLE32(out inode.block[i], block, inode_offset + 40 + i * 4);
}
Utils.LoadLE32(out inode.file_acl, block, inode_offset + 104);
return(inode);
}
/// <summary>
///
/// </summary>
protected override void ProcessRecord()
{
#region MBR
MasterBootRecord mbr = MasterBootRecord.Get(devicePath);
uint superblockOffset = 0;
foreach (PartitionEntry partition in mbr.PartitionTable)
{
if (partition.Bootable && partition.SystemID == "LINUX")
{
superblockOffset = partition.StartSector;
}
}
#endregion MBR
// Obtain a handle to the device named "devicePath"
IntPtr hDevice = NativeMethods.getHandle(devicePath);
using (FileStream streamToRead = NativeMethods.getFileStream(hDevice))
{
// Get Superblock to understand File System Layout
Superblock superBlock = new Superblock(Superblock.GetBytes(streamToRead, superblockOffset));
if (this.MyInvocation.BoundParameters.ContainsKey("Inode"))
{
if (inode == 0)
{
throw new Exception("0 is not a valid Inode value.");
}
else
{
uint block_group = (inode - 1) / superBlock.InodesPerGroup;
BlockGroupDescriptor bgd = new BlockGroupDescriptor(BlockGroupDescriptorTable.GetBytes(streamToRead, superblockOffset, superBlock));
uint inodeTableOffset = (superblockOffset * NativeMethods.BYTES_PER_SECTOR) + (bgd.InodeTableOffset * superBlock.BlockSize);
uint inodeSectorOffset = (inode - 1) / (NativeMethods.BYTES_PER_SECTOR / (uint)superBlock.InodeSize);
byte[] SectorBytes = NativeMethods.readDrive(streamToRead, inodeTableOffset + (inodeSectorOffset * NativeMethods.BYTES_PER_SECTOR), NativeMethods.BYTES_PER_SECTOR);
uint sectorOffset = ((inode - 1) % (NativeMethods.BYTES_PER_SECTOR / (uint)superBlock.InodeSize)) * (uint)superBlock.InodeSize;
byte[] inodeBytes = NativeMethods.GetSubArray(SectorBytes, sectorOffset, (uint)superBlock.InodeSize);
if (asbytes)
{
WriteObject(inodeBytes);
}
else
{
WriteObject(new Inode(inodeBytes, inode));
}
}
}
else
{
// Create a byte array representing the BGDT
byte[] bgdtBytes = BlockGroupDescriptorTable.GetBytes(streamToRead, superblockOffset, superBlock);
// Iterate through BGDTs and output associate Inodes
for (uint o = 0; o < bgdtBytes.Length; o += BlockGroupDescriptor.BLOCK_GROUP_DESCRIPTOR_LENGTH)
{
BlockGroupDescriptor bgd = new BlockGroupDescriptor(NativeMethods.GetSubArray(bgdtBytes, o, BlockGroupDescriptor.BLOCK_GROUP_DESCRIPTOR_LENGTH));
uint inodeTableOffset = (superblockOffset * NativeMethods.BYTES_PER_SECTOR) + (bgd.InodeTableOffset * superBlock.BlockSize);
byte[] inodeTableBytes = InodeTable.GetBytes(streamToRead, superBlock, inodeTableOffset);
for (uint i = 0; i < inodeTableBytes.Length; i += (uint)superBlock.InodeSize)
{
uint inode = ((o / BlockGroupDescriptor.BLOCK_GROUP_DESCRIPTOR_LENGTH) + 1) * ((i / (uint)superBlock.InodeSize) + 1);
WriteObject(new Inode(NativeMethods.GetSubArray(inodeTableBytes, i, superBlock.InodeSize), inode));
}
}
}
}
}
protected BlockGroupDescriptor GetGroupDescriptor( UInt32 block_group_id )
{
Byte[] block = new Byte[ BlockSize ];
const uint gd_entry_size = 32;
Int64 containing_block_id = block_group_id / ( BlockSize / gd_entry_size );
block_group_id = block_group_id % ( BlockSize / gd_entry_size );
if ( BlockSize == 1024 )
{
ReadBlock( block, 2 + containing_block_id );
}
else
{
ReadBlock( block, 1 + containing_block_id );
}
BlockGroupDescriptor descriptor = new BlockGroupDescriptor();
Utils.LoadLE32( out descriptor.block_bitmap_id, block, block_group_id * gd_entry_size + 0 );
Utils.LoadLE32( out descriptor.inode_bitmap_id, block, block_group_id * gd_entry_size + 4 );
Utils.LoadLE32( out descriptor.inode_table_id, block, block_group_id * gd_entry_size + 8 );
Utils.LoadLE16( out descriptor.free_blocks_count, block, block_group_id * gd_entry_size + 12 );
Utils.LoadLE16( out descriptor.free_inodes_count, block, block_group_id * gd_entry_size + 14 );
Utils.LoadLE16( out descriptor.dir_count, block, block_group_id * gd_entry_size + 16 );
return descriptor;
}
