internal static ReadOnlySpan <byte> ToBase64([NotNull] ICoverArt coverArt)
#endif
{
var dataLength = 32 + coverArt.MimeType.Length + coverArt.Data.Length;
Span <byte> buffer = new byte[Base64.GetMaxEncodedToUtf8Length(dataLength) + 1];
// Set the picture type as "Front Cover"
BinaryPrimitives.WriteUInt32BigEndian(buffer, 3);
BinaryPrimitives.WriteUInt32BigEndian(buffer.Slice(4), (uint)coverArt.MimeType.Length);
#if NETSTANDARD2_0
fixed(char *mimeTypeAddress = coverArt.MimeType)
fixed(byte *bufferAddress = buffer.Slice(8))
Encoding.ASCII.GetBytes(
mimeTypeAddress, coverArt.MimeType.Length,
bufferAddress, coverArt.MimeType.Length);
#else
Encoding.ASCII.GetBytes(coverArt.MimeType, buffer.Slice(8));
#endif
BinaryPrimitives.WriteUInt32BigEndian(buffer.Slice(12 + coverArt.MimeType.Length), (uint)coverArt.Width);
BinaryPrimitives.WriteUInt32BigEndian(buffer.Slice(16 + coverArt.MimeType.Length), (uint)coverArt.Height);
BinaryPrimitives.WriteUInt32BigEndian(buffer.Slice(20 + coverArt.MimeType.Length), (uint)coverArt.ColorDepth);
BinaryPrimitives.WriteUInt32BigEndian(buffer.Slice(28 + coverArt.MimeType.Length), (uint)coverArt.Data.Length);
coverArt.Data.CopyTo(buffer.Slice(32 + coverArt.MimeType.Length));
Base64.EncodeToUtf8InPlace(buffer, dataLength, out var bytesWritten);
return(buffer.Slice(0, bytesWritten + 1));
}
internal CoverArtToPictureBlockAdapter(ICoverArt coverArt)
{
SetData(coverArt.Data);
SetType(PictureType.CoverFront);
SetMimeType(coverArt.MimeType);
SetWidth(coverArt.Width);
SetHeight(coverArt.Height);
SetColorDepth(coverArt.ColorDepth);
}
public static ICoverArt ConvertToLossy([NotNull] ICoverArt coverArt)
{
if (coverArt == null)
{
throw new ArgumentNullException(nameof(coverArt));
}
if (!coverArt.Lossless)
{
return(coverArt);
}
using (var tempStream = new MemoryStream())
using (var image = Image.Load(coverArt.Data))
{
image.SaveAsJpeg(tempStream);
tempStream.Position = 0;
return(new CoverArt(tempStream));
}
}
internal static unsafe ReadOnlySpan <byte> ToBase64([NotNull] ICoverArt coverArt)
internal CoverAtom(ICoverArt coverArt) => Value = coverArt;
public CoverAtom(ReadOnlySpan <byte> data)
{
// There could be more than one data atom. Ignore all but the first.
Value = CoverArtFactory.GetOrCreate(data.Slice(24,
(int)BinaryPrimitives.ReadUInt32BigEndian(data.Slice(8, 4)) - 16));
}
internal CoverAtom([NotNull] ICoverArt coverArt)
{
Value = coverArt;
}
