private void Extract(NCSDPartition section, Stream outputStream)
{
using (outputStream)
{
Tools.ExtractFileStreamPart(this.NCSDMemoryMappedFile, outputStream, section.Offset, section.Size);
}
}
public void Decrypt(FileStream outputStream, bool trim = true)
{
if (this.Cryptor == null || this.SeedDatabase == null)
{
throw new ArgumentException("Cannot decrypt without seed database or crypto engine.");
}
long size;
if (!trim)
{
outputStream.SetLength(this.Info.ImageSize);
}
else
{
size = this.Info.Partitions[0].Offset;
foreach (NCSDPartition partition in this.Info.Partitions)
{
size += partition.Size;
}
outputStream.SetLength(size);
}
outputStream.Seek(0, SeekOrigin.Begin);
MemoryMappedFile outputFile = Tools.LoadFileMapped(outputStream);
using (MemoryMappedViewStream srcHeaderViewStream = this.NCSDMemoryMappedFile.CreateViewStream(0x0, this.Info.Partitions[0].Offset))
{
using (MemoryMappedViewStream destHeaderViewStream = outputFile.CreateViewStream(0x0, this.Info.Partitions[0].Offset))
{
srcHeaderViewStream.CopyTo(destHeaderViewStream);
}
}
foreach (NCSDPartition partition in this.Info.Partitions)
{
using (MemoryMappedViewStream destPartitionViewStream = outputFile.CreateViewStream(partition.Offset, partition.Size))
{
NCCH ncch = new NCCH(this.NCSDMemoryMappedFile, partition.Offset, this.Cryptor, this.SeedDatabase);
ncch.Decrypt(outputFile);
}
}
if (!trim)
{
NCSDPartition lastPartition = this.Info.Partitions.Last();
long lastPosition = lastPartition.Offset + lastPartition.Size;
using (MemoryMappedViewStream viewStream = outputFile.CreateViewStream(lastPosition, this.Info.ImageSize - lastPosition))
{
while (viewStream.Position / 64 < viewStream.Length / 64)
{
byte[] buffer = new byte[64];
for (int i = 0; i < buffer.Length; i++)
{
buffer[i] = 0xFF;
}
viewStream.Write(buffer, 0, buffer.Length);
}
}
}
}