public static PAC GetPAC(Stream pac)
{
PAC Data = new PAC();
BinaryReader br = new BinaryReader(pac);
pac.Position = 0;
Data._FileType = br.ReadString();
Data._Version = br.ReadInt32();
if (Data.FileType != FileTypeConst)
{
throw new Exception("Неверный тип файла");
}
if (Data.Version != VersionConst)
{
throw new Exception("Неверный тип файла");
}
var countitem = br.ReadInt32();
long curpos = pac.Position;
for (int i = 0; i < countitem; i++)
{
var item = new Item();
item.Identifier = br.ReadUInt64();
var length = br.ReadInt64();
item.FileType = (FileTypes)br.ReadInt64();
var pos = br.ReadInt64();
byte[] bytedata = new byte[length];
curpos = pac.Position;
pac.Position = pos;
pac.Read(bytedata, 0, (int)length);
item.Data = new MemoryStream(bytedata);
pac.Position = curpos;
Data.Items.Add(item);
}
Debug.WriteLine(Data.FileType);
Debug.WriteLine(Data.Version);
return(Data);
}
public static Stream CreatePAC(PAC pac)
{
MemoryStream ms = new MemoryStream();
var data = new BinaryWriter(ms);
data.Write(pac.FileType);
data.Write(pac.Version);
data.Write(pac.Items.Count);
// data.Flush();
var d = ms.Length;
long pos = ms.Position + (pac.Items.Count * 32); //Текущая позиция
long curpos = ms.Position;
foreach (var item in pac.Items)
{
data.Write(item.Identifier);
data.Write(item.Length);
data.Write((long)item.FileType);
data.Write(pos);
ms.SetLength(pos + item.Length
+ 11);
using (BinaryReader br = new BinaryReader(item.Data))
{
var b = br.ReadBytes((int)item.Length);
curpos = ms.Position;
ms.Position = pos;
ms.Write(b, 0, b.Length);
ms.Position = curpos;
}
pos += 32;
}
Debug.WriteLine(ms.Position - d);
data.Flush();
return(ms);
}