internal static IBinaryStream OpenEncrypted(IBinaryStream input, int encrypted_length = DefaultEncryptedLength)
{
input.Position = 0;
var header = input.ReadBytes(encrypted_length + 2);
header[0] ^= 0xFF;
header[1] = Binary.RotByteL((byte)~header[1], 1);
int shift = 1;
byte count = header[0];
for (int i = 2; i < header.Length; ++i)
{
header[i] = Binary.RotByteL(header[i], shift);
if (++shift >= 7)
{
shift = 1;
}
if (--count == 0)
{
if (shift <= 4)
{
count = header[1];
}
else
{
count = header[0];
}
shift = 1;
}
}
Stream stream = new StreamRegion(input.AsStream, header.Length, true);
stream = new PrefixStream(header, stream);
return(new BinaryStream(stream, input.Name));
}
private ImageData ReadJpeg(Stream file, SpdMetaData info)
{
file.Position = 0x18;
var header = new byte[0x3C];
if (header.Length != file.Read(header, 0, header.Length))
{
throw new EndOfStreamException();
}
unsafe
{
fixed(byte *raw = header)
{
uint *dw = (uint *)raw;
for (int i = 0; i < 0xF; ++i)
{
dw[i] += 0xA8961EF1;
}
}
}
using (var rest = new StreamRegion(file, file.Position, true))
using (var jpeg = new PrefixStream(header, rest))
{
var decoder = new JpegBitmapDecoder(jpeg,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
var frame = decoder.Frames[0];
frame.Freeze();
return(new ImageData(frame, info));
}
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
var actarc = arc as ActressArchive;
if (null == actarc || null == actarc.Key)
{
return(base.OpenEntry(arc, entry));
}
var header = ReadEntryHeader(actarc, entry);
Stream input;
if (entry.Size <= 0x20)
{
input = new BinMemoryStream(header, entry.Name);
}
else
{
input = new PrefixStream(header, arc.File.CreateStream(entry.Offset + 0x20, entry.Size - 0x20));
}
if (header.AsciiEqual("BM"))
{
return(input);
}
input.Position = 4;
return(new LzssStream(input));
}
internal IBinaryStream OpenFg(IBinaryStream fg)
{
var fge_name = Path.ChangeExtension(fg.Name, ".fge");
using (var fge = VFS.OpenView(fge_name))
{
if (fge.MaxOffset != 0x818)
{
throw new InvalidFormatException();
}
int chunk1_size = fge.View.ReadInt32(0);
int chunk2_offset = fge.View.ReadInt32(0x404);
int chunk2_size = fge.View.ReadInt32(0x408);
bool is_compressed = fge.View.ReadInt32(0x810) != 0;
int part1_size = chunk2_offset + chunk2_size;
var part1 = new byte[part1_size];
fge.View.Read(4, part1, 0, (uint)chunk1_size);
fg.Position = 5;
fg.Read(part1, chunk1_size, chunk2_offset - chunk1_size);
fge.View.Read(0x40C, part1, chunk2_offset, (uint)chunk2_size);
var part2 = new StreamRegion(fg.AsStream, fg.Position, true);
Stream fg_stream = new PrefixStream(part1, part2);
if (is_compressed)
{
fg_stream = new ZLibStream(fg_stream, CompressionMode.Decompress);
fg_stream = new SeekableStream(fg_stream);
}
return(new BinaryStream(fg_stream, fg.Name));
}
}
public override IImageDecoder OpenImage(ArcFile arc, Entry entry)
{
if (!entry.Name.HasExtension(".tga"))
{
return(base.OpenImage(arc, entry));
}
var input = arc.OpenBinaryEntry(entry);
try
{
var header = input.ReadHeader(18);
if (0 == header[16])
{
header[16] = 32;
}
if (0 == header[17] && 32 == header[16])
{
header[17] = 8;
}
Stream tga_input = new StreamRegion(input.AsStream, 18);
tga_input = new PrefixStream(header.ToArray(), tga_input);
var tga = new BinaryStream(tga_input, entry.Name);
var info = ImageFormat.Tga.ReadMetaData(tga);
if (info != null)
{
tga.Position = 0;
return(new ImageFormatDecoder(tga, ImageFormat.Tga, info));
}
}
catch { /* ignore errors */ }
input.Position = 0;
return(ImageFormatDecoder.Create(input));
}
public override IImageDecoder OpenImage(ArcFile arc, Entry entry)
{
var header = arc.File.View.ReadBytes(entry.Offset, 2);
if (header[0] != 0 || header[1] != 0)
{
return(base.OpenImage(arc, entry));
}
header[0] = (byte)'B';
header[1] = (byte)'M';
Stream input = arc.File.CreateStream(entry.Offset + 2, entry.Size - 2);
try
{
input = new PrefixStream(header, input);
var bmp = new BinaryStream(input, entry.Name);
var info = ImageFormat.Bmp.ReadMetaData(bmp);
if (null == info)
{
throw new InvalidFormatException();
}
bmp.Position = 0;
return(new ImageFormatDecoder(bmp, ImageFormat.Bmp, info));
}
catch
{
input.Dispose();
throw;
}
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
uint key = entry.Size / 8 + 0x22;
var header = new byte[Math.Min(4, entry.Size)];
arc.File.View.Read(entry.Offset, header, 0, (uint)header.Length);
for (int i = 0; i < header.Length; ++i)
{
header[i] ^= (byte)key;
key <<= 3;
}
var pent = entry as PackedEntry;
if (null != pent && !pent.IsPacked && entry.Size >= 8)
{
pent.IsPacked = true;
pent.UnpackedSize = arc.File.View.ReadUInt32(entry.Offset + entry.Size - 4);
}
Stream input;
if (header.Length == entry.Size)
{
input = new MemoryStream(header);
}
else
{
input = arc.File.CreateStream(entry.Offset + 4, entry.Size - 8);
input = new PrefixStream(header, input);
}
return(new ZLibStream(input, CompressionMode.Decompress));
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
var header = arc.File.View.ReadBytes(entry.Offset, 25);
if (header[0] < 'B' || header[0] > 'E' || header[1] != '1')
{
return(arc.File.CreateStream(entry.Offset, entry.Size));
}
if ('E' == header[0])
{
byte t = header[17];
header[17] = header[23];
header[23] = t;
t = header[19];
header[19] = header[24];
header[24] = t;
}
int unpacked_size = header.ToInt32(6);
var data = new byte[unpacked_size];
Stream input = arc.File.CreateStream(entry.Offset + header.Length, entry.Size - (uint)header.Length);
input = new PrefixStream(header, input);
input.Position = 10;
using (input = new LzssStream(input))
input.Read(data, 0, unpacked_size);
if (data.AsciiEqual("BPR01"))
{
return(new PackedStream <BprDecompressor> (Stream.Null, new BprDecompressor(data)));
}
else
{
return(new BinMemoryStream(data, entry.Name));
}
}
} // 'PAD'
public override SoundInput TryOpen(IBinaryStream file)
{
var wav_header = file.ReadHeader(0x2c).ToArray();
int pcm_size = LittleEndian.ToInt32(wav_header, 0x28);
int channels = LittleEndian.ToUInt16(wav_header, 0x16);
wav_header[0] = (byte)'R';
wav_header[1] = (byte)'I';
wav_header[2] = (byte)'F';
wav_header[3] = (byte)'F';
LittleEndian.Pack(pcm_size + 0x24, wav_header, 4);
var decoder = new PadDecoder(file.AsStream, pcm_size, channels);
decoder.Unpack();
var data = new MemoryStream(decoder.Data, 0, pcm_size);
var wav = new PrefixStream(wav_header, data);
try
{
return(new WaveInput(wav));
}
catch
{
wav.Dispose();
throw;
}
}
public override ImageData Read(Stream stream, ImageMetaData info)
{
var meta = info as YkgMetaData;
if (null == meta)
{
throw new ArgumentException("YkgFormat.Read should be supplied with YkgMetaData", "info");
}
switch (meta.Format)
{
case YkgImage.Bmp:
using (var bmp = new StreamRegion(stream, meta.DataOffset, meta.DataSize, true))
return(Bmp.Read(bmp, info));
case YkgImage.Png:
using (var png = new StreamRegion(stream, meta.DataOffset, meta.DataSize, true))
return(Png.Read(png, info));
case YkgImage.Gnp:
using (var body = new StreamRegion(stream, meta.DataOffset + 4, meta.DataSize - 4, true))
using (var png = new PrefixStream(PngPrefix, body))
return(Png.Read(png, info));
default:
throw new InvalidFormatException();
}
}
public override ImageData Read(Stream stream, ImageMetaData info)
{
var header = PngHeader.Clone() as byte[];
using (var data = new StreamRegion (stream, 8, stream.Length - 8, true))
using (var png = new PrefixStream (header, data))
return base.Read (png, info);
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
var rent = entry as RepiEntry;
if (null == rent || !rent.HasEncryptionKey)
{
return(arc.File.CreateStream(entry.Offset, entry.Size));
}
var key = rent.CreateKey();
uint enc_length = Math.Min((uint)key.Length, entry.Size);
byte[] encrypted = arc.File.View.ReadBytes(entry.Offset, enc_length);
DecryptEntry(encrypted, key);
Stream input;
if (enc_length == entry.Size)
{
input = new BinMemoryStream(encrypted, entry.Name);
}
else
{
input = arc.File.CreateStream(entry.Offset + enc_length, entry.Size - enc_length);
input = new PrefixStream(encrypted, input);
}
if (rent.IsPacked)
{
input = new LzssStream(input);
}
return(input);
}
IBinaryStream DeobfuscateStream(IBinaryStream file)
{
var body = new StreamRegion(file.AsStream, 8, file.Length - 8, true);
var png = new PrefixStream(HeaderBytes, body);
return(new BinaryStream(png, file.Name));
}
public override ImageData Read(IBinaryStream stream, ImageMetaData info)
{
var meta = (YkgMetaData)info;
switch (meta.Format)
{
case YkgImage.Bmp:
using (var reg = new StreamRegion(stream.AsStream, meta.DataOffset, meta.DataSize, true))
using (var bmp = new BinaryStream(reg, stream.Name))
return(Bmp.Read(bmp, info));
case YkgImage.Png:
using (var reg = new StreamRegion(stream.AsStream, meta.DataOffset, meta.DataSize, true))
using (var png = new BinaryStream(reg, stream.Name))
return(Png.Read(png, info));
case YkgImage.Gnp:
using (var body = new StreamRegion(stream.AsStream, meta.DataOffset + 4, meta.DataSize - 4, true))
using (var pre = new PrefixStream(PngPrefix, body))
using (var png = new BinaryStream(pre, stream.Name))
return(Png.Read(png, info));
default:
throw new InvalidFormatException();
}
}
public override ImageData Read(Stream stream, ImageMetaData info)
{
var header = PngHeader.Clone() as byte[];
using (var data = new StreamRegion(stream, 8, stream.Length - 8, true))
using (var png = new PrefixStream(header, data))
return(base.Read(png, info));
}
public override ImageData Read(IBinaryStream stream, ImageMetaData info)
{
var header = HeaderBytes.Clone() as byte[];
using (var data = new StreamRegion(stream.AsStream, 8, true))
using (var pre = new PrefixStream(header, data))
using (var png = new BinaryStream(pre, stream.Name))
return(base.Read(png, info));
}
IBinaryStream OpenAsBitmap(IBinaryStream input)
{
var header = new byte[2] {
(byte)'B', (byte)'M'
};
Stream stream = new StreamRegion(input.AsStream, 2, true);
stream = new PrefixStream(header, stream);
return(new BinaryStream(stream, input.Name));
}
IBinaryStream DeobfuscateStream(IBinaryStream file)
{
var header = file.ReadHeader(4).ToArray();
header[0] = 0x89;
var body = new StreamRegion(file.AsStream, 4, true);
var png = new PrefixStream(header, body);
return(new BinaryStream(png, file.Name));
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
ushort signature = arc.File.View.ReadUInt16(entry.Offset);
// C1/D1/E1/F1
if (0x3146 != signature && 0x3143 != signature && 0x3144 != signature && 0x3145 != signature)
{
return(base.OpenEntry(arc, entry));
}
var mkarc = arc as MkArchive;
ScrambleScheme scheme = mkarc != null ? mkarc.Scheme : DefaultScheme;
uint packed_size = arc.File.View.ReadUInt32(entry.Offset + 2);
if (packed_size < scheme.ScrambledSize || packed_size > entry.Size - 10)
{
return(base.OpenEntry(arc, entry));
}
Stream input;
// XXX scrambling might be applicable for 'E1' signatures only
if (scheme.ScrambledSize > 0)
{
var prefix = arc.File.View.ReadBytes(entry.Offset + 10, scheme.ScrambledSize);
foreach (var pair in scheme.ScrambleMap)
{
byte t = prefix[pair.Item1];
prefix[pair.Item1] = prefix[pair.Item2];
prefix[pair.Item2] = t;
}
input = arc.File.CreateStream(entry.Offset + 10 + scheme.ScrambledSize, packed_size - scheme.ScrambledSize);
input = new PrefixStream(prefix, input);
}
else
{
input = arc.File.CreateStream(entry.Offset + 10, packed_size);
}
input = new LzssStream(input);
var header = new byte[5];
input.Read(header, 0, 5);
if (Binary.AsciiEqual(header, "BPR02"))
{
return(new PackedStream <Bpr02Decompressor> (input));
}
if (Binary.AsciiEqual(header, "BPR01"))
{
return(new PackedStream <Bpr01Decompressor> (input));
}
return(new PrefixStream(header, input));
}
IBinaryStream OpenAsBitmap(IBinaryStream input)
{
var header = new byte[HeaderSize];
header[0] = (byte)'B';
header[1] = (byte)'M';
LittleEndian.Pack((uint)input.Length, header, 2);
Stream stream = new StreamRegion(input.AsStream, HeaderSize, true);
stream = new PrefixStream(header, stream);
return(new BinaryStream(stream, input.Name));
}
public override SoundInput TryOpen(IBinaryStream file)
{
var header = new byte[Math.Min(0xE1F, file.Length)];
if (0x10 != file.Read(header, 0, 0x10))
{
return(null);
}
var signature = LittleEndian.ToUInt32(header, 0);
byte[] key;
if (!KnownKeys.TryGetValue(signature, out key))
{
signature = LittleEndian.ToUInt32(header, 0xC);
if (!KnownKeys.TryGetValue(signature, out key))
{
return(null);
}
file.Read(header, 4, 0xC);
}
header[0] = (byte)'O';
header[1] = (byte)'g';
header[2] = (byte)'g';
header[3] = (byte)'S';
file.Read(header, 0x10, header.Length - 0x10);
int k = 0;
for (int i = 4; i < header.Length; ++i)
{
header[i] ^= key[k++];
if (k >= key.Length)
{
k = 1;
}
}
Stream input;
if (header.Length >= file.Length)
{
input = new MemoryStream(header);
}
else
{
input = new PrefixStream(header, new StreamRegion(file.AsStream, file.Position));
}
var sound = new OggInput(input);
if (header.Length >= file.Length)
{
file.Dispose();
}
return(sound);
}
internal IBinaryStream DeobfuscateStream(IBinaryStream file)
{
var header = file.ReadHeader(0x20).ToArray();
for (int i = 0; i < 0x20; ++i)
{
header[i] ^= 0xFF;
}
Stream stream = new StreamRegion(file.AsStream, 0x20, true);
stream = new PrefixStream(header, stream);
return(new BinaryStream(stream, file.Name));
}
public static IBinaryStream DecryptStream(IBinaryStream input, byte[] key, bool leave_open = false)
{
input.Position = 0x10;
var header = input.ReadBytes(key.Length);
for (int i = 0; i < key.Length; ++i)
{
header[i] ^= key[i];
}
var result = new PrefixStream(header, new StreamRegion(input.AsStream, input.Position, leave_open));
return(new BinaryStream(result, input.Name));
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
var gent = (GpkEntry)entry;
Stream input = arc.File.CreateStream(entry.Offset, entry.Size);
if (gent.Header != null)
{
input = new PrefixStream(gent.Header, input);
}
if (gent.IsPacked)
{
input = new ZLibStream(input, CompressionMode.Decompress);
}
return(input);
}
IBinaryStream DeobfuscateStream(IBinaryStream stream)
{
var png_header = new byte[0x10];
stream.Read(png_header, 5, 11);
System.Buffer.BlockCopy(PngHeader, 0, png_header, 0, 8);
for (int i = 0; i < 8; ++i)
{
png_header[i + 8] ^= (byte)"PGAECODE"[i];
}
var png_body = new StreamRegion(stream.AsStream, 11, true);
var pre = new PrefixStream(png_header, png_body);
return(new BinaryStream(pre, stream.Name));
}
public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
var header = stream.ReadHeader(8).ToArray();
if (!Binary.AsciiEqual(header, "MalieGF"))
{
return(null);
}
Buffer.BlockCopy(HeaderBytes, 0, header, 0, 8);
using (var data = new StreamRegion(stream.AsStream, 8, true))
using (var pre = new PrefixStream(header, data))
using (var png = new BinaryStream(pre, stream.Name))
return(base.ReadMetaData(png));
}
public override SoundInput TryOpen(IBinaryStream file)
{
var header = file.ReadHeader(0x12);
if (!header.AsciiEqual("\0\0\0\0"))
{
return(null);
}
int riff_length = header.ToInt32(4);
if (file.Length != riff_length + 8)
{
return(null);
}
if (!header.AsciiEqual(8, "\0\0\0\0\0\0\0\0"))
{
return(null);
}
int header_length = header.ToUInt16(0x10);
if (header_length < 0x10 || header_length > riff_length)
{
return(null);
}
header = file.ReadHeader(0x18 + header_length);
if (!header.AsciiEqual(0x14 + header_length, "data"))
{
return(null);
}
var header_bytes = new byte[0x10] {
(byte)'R', (byte)'I', (byte)'F', (byte)'F', header[4], header[5], header[6], header[7],
(byte)'W', (byte)'A', (byte)'V', (byte)'E', (byte)'f', (byte)'m', (byte)'t', (byte)' '
};
Stream riff = new StreamRegion(file.AsStream, 0x10);
riff = new PrefixStream(header_bytes, riff);
var wav = new BinaryStream(riff, file.Name);
try
{
return(Wav.TryOpen(wav));
}
catch
{
wav.Dispose();
throw;
}
}
public override ImageData Read(IBinaryStream file, ImageMetaData info)
{
var header = file.ReadHeader(100).ToArray();
for (int i = 0; i < header.Length; ++i)
{
header[i] ^= 0xFF;
}
using (var rest = new StreamRegion(file.AsStream, 100, true))
using (var input = new PrefixStream(header, rest))
{
var decoder = new BmpBitmapDecoder(input, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
var frame = decoder.Frames[0];
frame.Freeze();
return(new ImageData(frame, info));
}
}
public override ImageMetaData ReadMetaData(Stream stream)
{
var header = new byte[8];
if (8 != stream.Read(header, 0, 8))
{
return(null);
}
if (!Binary.AsciiEqual(header, "MalieGF"))
{
return(null);
}
Buffer.BlockCopy(PngHeader, 0, header, 0, 8);
using (var data = new StreamRegion(stream, 8, stream.Length - 8, true))
using (var png = new PrefixStream(header, data))
return(base.ReadMetaData(png));
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
ushort signature = arc.File.View.ReadUInt16(entry.Offset);
// C1/D1/E1/F1
if (0x3146 != signature && 0x3143 != signature && 0x3144 != signature && 0x3145 != signature)
{
return(base.OpenEntry(arc, entry));
}
uint packed_size = arc.File.View.ReadUInt32(entry.Offset + 2);
if (packed_size < 14 || packed_size > entry.Size - 10)
{
return(base.OpenEntry(arc, entry));
}
// XXX scrambling might be applicable for 'E1' signatures only
var prefix = arc.File.View.ReadBytes(entry.Offset + 10, 14);
byte t = prefix[7];
prefix[7] = prefix[11];
prefix[11] = t;
t = prefix[9];
prefix[9] = prefix[12];
prefix[12] = t;
Stream input = arc.File.CreateStream(entry.Offset + 24, packed_size - 14);
input = new PrefixStream(prefix, input);
input = new LzssStream(input);
var header = new byte[5];
input.Read(header, 0, 5);
if (Binary.AsciiEqual(header, "BPR02"))
{
return(new PackedStream <Bpr02Decompressor> (input));
}
if (Binary.AsciiEqual(header, "BPR01"))
{
return(new PackedStream <Bpr01Decompressor> (input));
}
return(new PrefixStream(header, input));
}
public override SoundInput TryOpen(IBinaryStream file)
{
var header = file.ReadHeader(0x38);
var format = new WaveFormat {
FormatTag = 2,
Channels = header.ToUInt16(6),
SamplesPerSecond = header.ToUInt32(8),
AverageBytesPerSecond = header.ToUInt32(0xC),
BlockAlign = header.ToUInt16(0x10),
BitsPerSample = header.ToUInt16(0x12),
ExtraSize = 0x20,
};
var codec_data = header.Skip(0x14).Take(format.ExtraSize).ToArray();
int adpcm_length = header.ToInt32(0x34);
byte[] wav_header;
using (var wav = new MemoryStream())
using (var buffer = new BinaryWriter(wav, Encoding.ASCII, true))
{
buffer.Write(Wav.Signature);
buffer.Write(adpcm_length + 0x46);
buffer.Write(0x45564157); // 'WAVE'
buffer.Write(0x20746d66); // 'fmt '
buffer.Write(0x32);
buffer.Write(format.FormatTag);
buffer.Write(format.Channels);
buffer.Write(format.SamplesPerSecond);
buffer.Write(format.AverageBytesPerSecond);
buffer.Write(format.BlockAlign);
buffer.Write(format.BitsPerSample);
buffer.Write(format.ExtraSize);
buffer.Write(codec_data);
buffer.Write(0x61746164); // 'data'
buffer.Write(adpcm_length);
buffer.Flush();
wav_header = wav.ToArray();
}
Stream input = new StreamRegion(file.AsStream, file.Position);
input = new PrefixStream(wav_header, input);
return(new WaveInput(input));
}
public override ImageData Read(Stream stream, ImageMetaData info)
{
var meta = info as YkgMetaData;
if (null == meta)
throw new ArgumentException ("YkgFormat.Read should be supplied with YkgMetaData", "info");
switch (meta.Format)
{
case YkgImage.Bmp:
using (var bmp = new StreamRegion (stream, meta.DataOffset, meta.DataSize, true))
return Bmp.Read (bmp, info);
case YkgImage.Png:
using (var png = new StreamRegion (stream, meta.DataOffset, meta.DataSize, true))
return Png.Read (png, info);
case YkgImage.Gnp:
using (var body = new StreamRegion (stream, meta.DataOffset+4, meta.DataSize-4, true))
using (var png = new PrefixStream (PngPrefix, body))
return Png.Read (png, info);
default:
throw new InvalidFormatException();
}
}
public override ImageMetaData ReadMetaData(Stream stream)
{
var header = new byte[8];
if (8 != stream.Read (header, 0, 8))
return null;
if (!Binary.AsciiEqual (header, "MalieGF"))
return null;
Buffer.BlockCopy (PngHeader, 0, header, 0, 8);
using (var data = new StreamRegion (stream, 8, stream.Length - 8, true))
using (var png = new PrefixStream (header, data))
return base.ReadMetaData (png);
}
public override ImageMetaData ReadMetaData(Stream stream)
{
var header = new byte[0x40];
if (header.Length != stream.Read (header, 0, header.Length))
return null;
if (!Binary.AsciiEqual (header, 4, "00\0\0"))
return null;
var ykg = new YkgMetaData {
DataOffset = LittleEndian.ToUInt32 (header, 0x28),
DataSize = LittleEndian.ToUInt32 (header, 0x2C)
};
if (0 == ykg.DataOffset)
ykg.DataOffset = LittleEndian.ToUInt32 (header, 8);
if (ykg.DataOffset < 0x30)
return null;
if (0 == ykg.DataSize)
ykg.DataSize = (uint)(stream.Length - ykg.DataOffset);
ImageMetaData info = null;
using (var img = new StreamRegion (stream, ykg.DataOffset, ykg.DataSize, true))
{
if (4 != img.Read (header, 0, 4))
return null;
if (Binary.AsciiEqual (header, "BM"))
{
img.Position = 0;
info = ImageFormat.Bmp.ReadMetaData (img);
ykg.Format = YkgImage.Bmp;
}
else if (Binary.AsciiEqual (header, "\x89PNG"))
{
img.Position = 0;
info = Png.ReadMetaData (img);
ykg.Format = YkgImage.Png;
}
else if (Binary.AsciiEqual (header, "\x89GNP"))
{
using (var body = new StreamRegion (stream, ykg.DataOffset+4, ykg.DataSize-4, true))
using (var png = new PrefixStream (PngPrefix, body))
info = Png.ReadMetaData (png);
ykg.Format = YkgImage.Gnp;
}
}
if (null == info)
return null;
ykg.Width = info.Width;
ykg.Height = info.Height;
ykg.BPP = info.BPP;
ykg.OffsetX = info.OffsetX;
ykg.OffsetY = info.OffsetY;
return ykg;
}
