public static ImcFile FromFile(string fileName)
{
var imc = new ImcFile();
imc.FileName = fileName;
FileStream filestream = null;
try
{
filestream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
using (BinaryReader file = new BinaryReader(filestream))
{
filestream = null;
if (Encoding.ASCII.GetString(file.ReadBytes(4)) != "MCMP")
{
throw new InvalidDataException();
}
int entriesCount = file.ReadBigEndianInt16();
file.BaseStream.Seek(9, SeekOrigin.Current);
for (int i = 0; i < entriesCount - 1; i++)
{
var entry = new ImcEntry();
entry.Codec = file.ReadByte();
entry.RawSize = file.ReadBigEndianInt32();
entry.CompressedSize = file.ReadBigEndianInt32();
imc.Entries.Add(entry);
}
int codecsCount = file.ReadBigEndianInt16() / 5;
for (int i = 0; i < codecsCount; i++)
{
imc.Codecs.Add(Encoding.ASCII.GetString(file.ReadBytes(4)));
file.ReadByte();
}
if (imc.Codecs.Count != 2 ||
!string.Equals(imc.Codecs[0], "NULL", StringComparison.Ordinal) ||
!string.Equals(imc.Codecs[1], "VIMA", StringComparison.Ordinal))
{
throw new NotSupportedException();
}
if (Encoding.ASCII.GetString(file.ReadBytes(4)) != "iMUS")
{
throw new InvalidDataException();
}
int imusRawSize = file.ReadInt32();
if (Encoding.ASCII.GetString(file.ReadBytes(4)) != "MAP ")
{
throw new InvalidDataException();
}
ImcFile.ReadMap(imc, file, imusRawSize);
if (Encoding.ASCII.GetString(file.ReadBytes(4)) != "DATA")
{
throw new InvalidDataException();
}
imc.DataRawSize = file.ReadBigEndianInt32();
if (imc.DataRawSize != imc.Entries.Sum(t => t.RawSize))
{
throw new InvalidDataException();
}
foreach (var entry in imc.Entries)
{
entry.Data = file.ReadBytes(entry.CompressedSize);
}
if (file.BaseStream.Position != file.BaseStream.Length)
{
throw new InvalidDataException("End of file not reached.");
}
imc.ComputeEntriesOffsets();
}
}
finally
{
if (filestream != null)
{
filestream.Dispose();
}
}
return(imc);
}
