public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
var key = new byte[0x10];
stream.Position = 4;
if (key.Length != stream.Read(key, 0, key.Length))
{
return(null);
}
using (var enc = new InputProxyStream(stream.AsStream, true))
using (var crypto = new InputCryptoStream(enc, new GaxTransform(key)))
using (var input = new BinaryStream(crypto, stream.Name))
{
var info = Png.ReadMetaData(input);
if (null == info)
{
return(null);
}
return(new GaxMetaData
{
OffsetX = info.OffsetX,
OffsetY = info.OffsetY,
Width = info.Width,
Height = info.Height,
BPP = info.BPP,
Key = key,
});
}
}
public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
using (var sha = SHA1.Create())
{
var key = sha.ComputeHash(KnownKey).Take(16).ToArray();
using (var proxy = new InputProxyStream(stream.AsStream, true))
using (var crypto = new InputCryptoStream(proxy, new Rc4Transform(key)))
using (var input = new BinaryStream(crypto, stream.Name))
{
var info = base.ReadMetaData(input);
if (null == info)
{
return(null);
}
return(new Rc4PngMetaData
{
Width = info.Width,
Height = info.Height,
OffsetX = info.OffsetX,
OffsetY = info.OffsetY,
BPP = info.BPP,
Key = key,
});
}
}
}
public override ImageData Read(IBinaryStream stream, ImageMetaData info)
{
var rc4 = (Rc4PngMetaData)info;
using (var sha = SHA1.Create())
using (var proxy = new InputProxyStream(stream.AsStream, true))
using (var crypto = new InputCryptoStream(proxy, new Rc4Transform(rc4.Key)))
using (var input = new BinaryStream(crypto, stream.Name))
return(base.Read(input, info));
}
bool ReadV1(Stream input, int entry_size)
{
// NOTE CryptoStream will close an input stream
using (var proxy = new InputProxyStream(input, true))
using (var xored = new InputCryptoStream(proxy, new NotTransform()))
using (var lzss = new LzssStream(xored))
if (m_index.Length != lzss.Read(m_index, 0, m_index.Length))
{
return(false);
}
int index_offset = Array.IndexOf <byte> (m_index, 0);
if (-1 == index_offset || 0 == index_offset)
{
return(false);
}
Password = m_index.Take(index_offset++).ToArray();
long base_offset = 0x20 + m_packed_size;
for (int i = 0; i < m_count; ++i)
{
var entry = new PackedEntry();
entry.Offset = LittleEndian.ToUInt32(m_index, index_offset) + base_offset;
entry.Size = LittleEndian.ToUInt32(m_index, index_offset + 4);
if (!entry.CheckPlacement(m_file.MaxOffset))
{
return(false);
}
entry.UnpackedSize = LittleEndian.ToUInt32(m_index, index_offset + 8);
entry.IsPacked = entry.UnpackedSize != 0;
if (!entry.IsPacked)
{
entry.UnpackedSize = entry.Size;
}
int name_len = LittleEndian.ToInt32(m_index, index_offset + 0xC);
if (name_len <= 0 || name_len > 0x100)
{
return(false);
}
entry.Name = Encodings.cp932.GetString(m_index, index_offset + entry_size, name_len);
entry.Type = FormatCatalog.Instance.GetTypeFromName(entry.Name);
m_dir.Value.Add(entry);
index_offset += entry_size + name_len;
}
return(true);
}
