public EnhancedPacketBlock GetPacketAt(long packetBlockOffset)
{
// TODO:
bool reverseByteOrder = false;
using (FileStream fileStream = File.Open(Path, FileMode.Open, FileAccess.ReadWrite, FileShare.Read))
using (BinaryReader binReader = new BinaryReader(fileStream)) {
// Navigate to the overridden block start
long actualOffset = fileStream.Seek(packetBlockOffset, SeekOrigin.Begin);
// Make sure seek succeeded
if (actualOffset != packetBlockOffset)
{
throw new Exception($"Couldn't seek to offset {packetBlockOffset}");
}
// Read next 8 bytes of the block we are overriding:
BaseBlock.Types type = (BaseBlock.Types)binReader.ReadUInt32();
if (type != BaseBlock.Types.EnhancedPacket)
{
throw new Exception($"Expected an ENHANCED PACKET BLOCK (val:{BaseBlock.Types.EnhancedPacket}) in the given offset but got: {type}");
}
fileStream.Seek(-4, SeekOrigin.Current);
var block = AbstractBlockFactory.ReadNextBlock(binReader, reverseByteOrder, (ex) => Debug.WriteLine("Kek!" + ex));
if (block == null || block.BlockType != BaseBlock.Types.EnhancedPacket)
{
throw new Exception("Block at given position was not parsed to a ENHANCED PACKET BLOCK");
}
return(block as EnhancedPacketBlock);
}
}
public List <long> GetPacketsOffsets()
{
if (_cachedOffsets == null)
{
_cachedOffsets = new List <long>();
int packetCounter = 0;
using (FileStream fileStream = File.OpenRead(Path))
using (BinaryReader binReader = new BinaryReader(fileStream)) {
while (fileStream.Position != fileStream.Length)
{
// Read next 8 bytes of block:
BaseBlock.Types type = (BaseBlock.Types)binReader.ReadUInt32();
uint len = binReader.ReadUInt32();
if (type == BaseBlock.Types.EnhancedPacket)
{
_cachedOffsets.Add(fileStream.Position - 8);
packetCounter++;
}
// Advance to next block start
fileStream.Seek(len - 8, SeekOrigin.Current);
}
}
}
return(_cachedOffsets);
}
public List <InterfaceDescriptionBlock> GetInterfaces()
{
if (_cachedIfacesBlock == null)
{
// TODO:
bool reverseByteOrder = false;
_cachedIfacesBlock = new List <InterfaceDescriptionBlock>();
// Checking until first packet block or end of file
using (FileStream fileStream = File.OpenRead(Path))
using (BinaryReader binReader = new BinaryReader(fileStream)) {
while (fileStream.Position != fileStream.Length)
{
// Read next 8 bytes of block:
BaseBlock.Types type = (BaseBlock.Types)binReader.ReadUInt32();
uint len = binReader.ReadUInt32();
if (type == BaseBlock.Types.EnhancedPacket)
{
// Found a packet block, stopping search
break;
}
if (type == BaseBlock.Types.InterfaceDescription)
{
fileStream.Seek(-8, SeekOrigin.Current);
var block = AbstractBlockFactory.ReadNextBlock(binReader, reverseByteOrder, (ex) => Debug.WriteLine("Kek!" + ex));
if (block == null || block.BlockType != BaseBlock.Types.InterfaceDescription)
{
throw new Exception("Block at given position was not parsed to a INTERFACE DESCRIPTION BLOCK");
}
_cachedIfacesBlock.Add(block as InterfaceDescriptionBlock);
}
else
{
// Advance to next block start
fileStream.Seek(len - 8, SeekOrigin.Current);
}
}
}
}
return(_cachedIfacesBlock);
}
/// <summary>
/// Replaces a packet with a new packet
/// </summary>
/// <param name="packetBlockOffset">Offset in the file where the block begins</param>
/// <param name="newPacket">New packet block</param>
public void ReplacePacket(long packetBlockOffset, EnhancedPacketBlock newPacket)
{
// TODO: Reverse Byte order not always false probably...
byte[] data = newPacket.ConvertToByte(false, (ex) => Debug.WriteLine("LOL!" + ex));
using (FileStream fileStream = File.Open(Path, FileMode.Open, FileAccess.ReadWrite))
using (BinaryReader binReader = new BinaryReader(fileStream)) {
// Navigate to the overridden block start
long actualOffset = fileStream.Seek(packetBlockOffset, SeekOrigin.Begin);
// Make sure seek succeeded
if (actualOffset != packetBlockOffset)
{
throw new Exception($"Couldn't seek to offset {packetBlockOffset}");
}
// Read next 8 bytes of the block we are overriding:
BaseBlock.Types type = (BaseBlock.Types)binReader.ReadUInt32();
uint len = binReader.ReadUInt32();
if (type != BaseBlock.Types.EnhancedPacket)
{
throw new Exception($"Expected an ENHANCED PACKET BLOCK (val:{BaseBlock.Types.EnhancedPacket}) in the given offset but got: {type}");
}
if (len < data.Length)
{
ReplacePacketLonger(data, fileStream, len);
}
if (len > data.Length)
{
ReplacePacketShorter(data, fileStream, len);
}
else
{
// Lengths match exactly
fileStream.Seek(-4, SeekOrigin.Current);
fileStream.Write(data, 4, data.Length - 4);
}
}
}
