private static Stream CreateCompressStream(FileStream stream, string encoding)
{
if (encoding == "gzip")
{
return(new GZipStream(stream, CompressionMode.Compress));
}
DebugThrow.IfNotEqual("deflate", encoding);
return(new DeflateStream(stream, CompressionMode.Compress));
}
internal static IImageData Create(IUrlResolver urlResolver, MagickFormatInfo formatInfo)
{
IFileUrlResolver fileUrlResolver = urlResolver as IFileUrlResolver;
if (fileUrlResolver != null)
{
return(new FileImageData(fileUrlResolver.FileName, formatInfo));
}
IStreamUrlResolver streamUrlResolver = urlResolver as IStreamUrlResolver;
DebugThrow.IfNull(streamUrlResolver);
return(new StreamImageData(streamUrlResolver, formatInfo));
}
protected override string GetFileName(HttpContext context)
{
DebugThrow.IfNull(nameof(context), context);
string encoding = GetEncoding(context.Request);
if (string.IsNullOrEmpty(encoding))
{
return(null);
}
string cacheFileName = GetCacheFileName("Compressed", encoding, ImageData.FormatInfo.Format);
if (!CanUseCache(cacheFileName))
{
CreateCompressedFile(encoding, cacheFileName);
}
context.Response.AppendHeader("Content-Encoding", encoding);
context.Response.AppendHeader("Vary", "Accept-Encoding");
return(cacheFileName);
}