FileEncoder.cs

using System;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using Waher.Runtime.Inventory;
using Waher.Runtime.IO;
 
namespace Waher.Content.Binary
{
    public class FileEncoder : IContentEncoder
    {
        public FileEncoder()
        {
        }
 
        public string[] ContentTypes => Array.Empty<string>();
 
        public string[] FileExtensions => Array.Empty<string>();
 
        public async Task<ContentResponse> EncodeAsync(object Object, Encoding Encoding,
            ICodecProgress Progress, params string[] AcceptedContentTypes)
        {
            if (Object is FileReference Ref)
            {
                using (FileStream f = File.OpenRead(Ref.FileName))
                {
                    byte[] Bin = await f.ReadAllAsync();
                    return new ContentResponse(Ref.ContentType, Object, Bin);
                }
            }
            else
                return new ContentResponse(new ArgumentException("Unable to encode object.", nameof(Object)));
        }
 
        public bool Encodes(object Object, out Grade Grade, params string[] AcceptedContentTypes)
        {
            if (Object is FileReference Ref)
            {
                if (InternetContent.IsAccepted(Ref.ContentType, AcceptedContentTypes))
                {
                    Grade = Grade.Ok;
                    return true;
                }
            }
 
            Grade = Grade.NotAtAll;
            return false;
        }
 
        public bool TryGetContentType(string FileExtension, out string ContentType)
        {
            ContentType = null;
            return false;
        }
 
        public bool TryGetFileExtension(string ContentType, out string FileExtension)
        {
            FileExtension = null;
            return false;
        }
    }
}