public static RecoveryPacket Create(PacketHeader header, byte[] bytes, int index, string filename, int file_offset)
{
RecoveryPacket tmpPacket = new RecoveryPacket();
tmpPacket.header = header;
int offset = 0;
tmpPacket.exponent = BitConverter.ToUInt32(bytes, index + offset);
offset += sizeof(UInt32);
tmpPacket.offset = index + offset + file_offset;
tmpPacket.length = (int)header.length - header.GetSize() - sizeof(UInt32);
tmpPacket.filename = filename;
tmpPacket.diskfile = new DiskFile();
tmpPacket.diskfile.Open(filename);
tmpPacket.datablock = new DataBlock();
// Set the data block to immediatly follow the header on disk
tmpPacket.datablock.SetLocation(tmpPacket.diskfile, (ulong)tmpPacket.offset);
tmpPacket.datablock.SetLength((ulong)tmpPacket.length);
return(tmpPacket);
}
internal static RecoveryPacket Create(DiskFile diskFile, ulong offset, ulong blocksize, uint exponent, byte[] setid)
{
RecoveryPacket tmpPacket = new RecoveryPacket();
// Fill in the details the we know
tmpPacket.header = new PacketHeader();
tmpPacket.header.magic = Par2FileReader.packet_magic;
tmpPacket.header.hash = new byte[16]; // Compute later
tmpPacket.header.setid = setid;
tmpPacket.header.type = Par2FileReader.recoveryblockpacket_type;
tmpPacket.diskfile = diskFile;
tmpPacket.offset = (int)offset;
tmpPacket.exponent = exponent;
//tmpPacket.length = 0; //
tmpPacket.header.length = (ulong)(tmpPacket.header.GetSize() + sizeof(UInt32) + (int)blocksize);
tmpPacket.length = (int)tmpPacket.header.length;
// Start computation of the packet hash
tmpPacket.packetcontext = MD5.Create();
using (MemoryStream ms = new MemoryStream())
{
using (BinaryWriter bw = new BinaryWriter(ms))
{
// PacketHeader section
bw.Write(tmpPacket.header.setid);
bw.Write(tmpPacket.header.type);
//Packet section
bw.Write(tmpPacket.exponent);
byte[] buffer = ms.ToArray();
tmpPacket.packetcontext.TransformBlock(buffer, 0, buffer.Length, null, 0);
}
}
// Set the data block to immediatly follow the header on disk
tmpPacket.datablock = new DataBlock();
tmpPacket.datablock.SetLocation(tmpPacket.diskfile, (ulong)(tmpPacket.offset + tmpPacket.GetSize()));
tmpPacket.datablock.SetLength(blocksize);
return(tmpPacket);
}
public static RecoveryPacket Create(PacketHeader header, byte[] bytes, int index, string filename, int file_offset)
{
RecoveryPacket tmpPacket = new RecoveryPacket();
tmpPacket.header = header;
int offset = 0;
tmpPacket.exponent = BitConverter.ToUInt32(bytes, index + offset);
offset += sizeof(UInt32);
tmpPacket.offset = index + offset + file_offset;
tmpPacket.length = (int)header.length - header.GetSize() - sizeof(UInt32);
tmpPacket.filename = filename;
tmpPacket.diskfile = new DiskFile();
tmpPacket.diskfile.Open(filename);
tmpPacket.datablock = new DataBlock();
// Set the data block to immediatly follow the header on disk
tmpPacket.datablock.SetLocation(tmpPacket.diskfile, (ulong)tmpPacket.offset);
tmpPacket.datablock.SetLength((ulong)tmpPacket.length);
return tmpPacket;
}
internal static RecoveryPacket Create(DiskFile diskFile, ulong offset, ulong blocksize, uint exponent, byte[] setid)
{
RecoveryPacket tmpPacket = new RecoveryPacket();
// Fill in the details the we know
tmpPacket.header = new PacketHeader();
tmpPacket.header.magic = Par2FileReader.packet_magic;
tmpPacket.header.hash = new byte[16]; // Compute later
tmpPacket.header.setid = setid;
tmpPacket.header.type = Par2FileReader.recoveryblockpacket_type;
tmpPacket.diskfile = diskFile;
tmpPacket.offset = (int)offset;
tmpPacket.exponent = exponent;
//tmpPacket.length = 0; //
tmpPacket.header.length = (ulong)(tmpPacket.header.GetSize() + sizeof(UInt32) + (int)blocksize);
tmpPacket.length = (int)tmpPacket.header.length;
// Start computation of the packet hash
tmpPacket.packetcontext = MD5.Create();
using (MemoryStream ms = new MemoryStream())
{
using (BinaryWriter bw = new BinaryWriter(ms))
{
// PacketHeader section
bw.Write(tmpPacket.header.setid);
bw.Write(tmpPacket.header.type);
//Packet section
bw.Write(tmpPacket.exponent);
byte[] buffer = ms.ToArray();
tmpPacket.packetcontext.TransformBlock(buffer, 0, buffer.Length, null, 0);
}
}
// Set the data block to immediatly follow the header on disk
tmpPacket.datablock = new DataBlock();
tmpPacket.datablock.SetLocation(tmpPacket.diskfile, (ulong)(tmpPacket.offset + tmpPacket.GetSize()));
tmpPacket.datablock.SetLength(blocksize);
return tmpPacket;
}
