public EncryptedStream(Stream output, NpaEntry entry, EncryptionScheme scheme, int arc_key)
{
m_read_mode = false;
m_encrypted_length = GetEncryptedLength(entry, scheme.TitleId);
int key = NpaOpener.GetKeyFromEntry(entry, scheme, arc_key);
m_stream = output;
m_encrypted = new Lazy <byte[]> (() => new byte[m_encrypted_length]);
m_base_pos = m_stream.Position;
byte[] decrypt_table = NpaOpener.GenerateKeyTable(scheme);
byte[] encrypt_table = new byte[256];
for (int i = 0; i < 256; ++i)
{
encrypt_table[decrypt_table[i]] = (byte)i;
}
if (NpaTitleId.LAMENTO == scheme.TitleId)
{
Encrypt = (i, x) => encrypt_table[(x + key) & 0xff];
}
else
{
Encrypt = (i, x) => encrypt_table[(x + key + i) & 0xff];
}
}
public NpaArchive(ArcView arc, ArchiveFormat impl, ICollection <Entry> dir,
EncryptionScheme scheme, int key)
: base(arc, impl, dir)
{
Scheme = scheme;
Key = key;
m_key_table = new Lazy <byte[]> (() => NpaOpener.GenerateKeyTable(scheme));
}
public EncryptedStream(NpaArchive arc, NpaEntry entry)
{
m_read_mode = true;
m_encrypted_length = GetEncryptedLength(entry, arc.Scheme.TitleId);
if (m_encrypted_length > entry.Size)
{
m_encrypted_length = (int)entry.Size;
}
int key = NpaOpener.GetKeyFromEntry(entry, arc.Scheme, arc.Key);
m_stream = arc.File.CreateStream(entry.Offset, entry.Size);
m_encrypted = new Lazy <byte[]> (() => InitEncrypted(key, arc.Scheme.TitleId, arc.KeyTable));
m_base_pos = m_stream.Position;
}
public Indexer(IEnumerable <Entry> source_list, NpaOptions options)
{
m_entries = new List <NpaEntry> (source_list.Count());
var title_id = null != options.Scheme ? options.Scheme.TitleId : NpaTitleId.NotEncrypted;
m_key = NpaOpener.GetArchiveKey(title_id, options.Key1, options.Key2);
foreach (var entry in source_list)
{
string name = entry.Name;
try
{
var dir = Path.GetDirectoryName(name);
int folder_id = 0;
if (!string.IsNullOrEmpty(dir))
{
folder_id = AddDirectory(dir);
}
bool compress = options.CompressContents;
if (compress) // don't compress images
{
compress = !FormatCatalog.Instance.LookupFileName(name).OfType <ImageFormat>().Any();
}
var npa_entry = new NpaEntry
{
Name = name,
IsPacked = compress,
RawName = m_encoding.GetBytes(name),
FolderId = folder_id,
};
++m_file_count;
AddEntry(npa_entry);
}
catch (EncoderFallbackException X)
{
throw new InvalidFileName(name, arcStrings.MsgIllegalCharacters, X);
}
}
}
