public override ImageMetaData ReadMetaData(IBinaryStream file)
{
var header = file.ReadHeader(0x40);
if (!header.AsciiEqual(4, "00\0\0"))
{
return(null);
}
var ykg = new YkgMetaData {
DataOffset = header.ToUInt32(0x28),
DataSize = header.ToUInt32(0x2C)
};
if (0 == ykg.DataOffset)
{
ykg.DataOffset = header.ToUInt32(8);
}
if (ykg.DataOffset < 0x30)
{
return(null);
}
if (0 == ykg.DataSize)
{
ykg.DataSize = (uint)(file.Length - ykg.DataOffset);
}
ImageMetaData info = null;
using (var reg = new StreamRegion(file.AsStream, ykg.DataOffset, ykg.DataSize, true))
using (var img = new BinaryStream(reg, file.Name))
{
var img_header = img.ReadHeader(4);
if (header.AsciiEqual("BM"))
{
img.Position = 0;
info = Bmp.ReadMetaData(img);
ykg.Format = YkgImage.Bmp;
}
else if (header.AsciiEqual("\x89PNG"))
{
img.Position = 0;
info = Png.ReadMetaData(img);
ykg.Format = YkgImage.Png;
}
else if (header.AsciiEqual("\x89GNP"))
{
using (var body = new StreamRegion(file.AsStream, ykg.DataOffset + 4, ykg.DataSize - 4, true))
using (var pre = new PrefixStream(PngPrefix, body))
using (var png = new BinaryStream(pre, file.Name))
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);
}
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);
}
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;
}
