Initial QSfera import

Server/vendor/github.com/kovidgoyal/imaging/prism/meta/autometa/autometa.go

@@ -0,0 +1,50 @@
+package autometa
+
+import (
+	"io"
+
+	"github.com/kovidgoyal/imaging/prism/meta"
+	"github.com/kovidgoyal/imaging/prism/meta/gifmeta"
+	"github.com/kovidgoyal/imaging/prism/meta/jpegmeta"
+	"github.com/kovidgoyal/imaging/prism/meta/netpbmmeta"
+	"github.com/kovidgoyal/imaging/prism/meta/pngmeta"
+	"github.com/kovidgoyal/imaging/prism/meta/tiffmeta"
+	"github.com/kovidgoyal/imaging/prism/meta/webpmeta"
+	"github.com/kovidgoyal/imaging/streams"
+)
+
+var loaders = []func(io.Reader) (*meta.Data, error){
+	jpegmeta.ExtractMetadata,
+	pngmeta.ExtractMetadata,
+	gifmeta.ExtractMetadata,
+	webpmeta.ExtractMetadata,
+	tiffmeta.ExtractMetadata,
+	netpbmmeta.ExtractMetadata,
+}
+
+// Load loads the metadata for an image stream, which may be one of the
+// supported image formats.
+//
+// Only as much of the stream is consumed as necessary to extract the metadata;
+// the returned stream contains a buffered copy of the consumed data such that
+// reading from it will produce the same results as fully reading the input
+// stream. This provides a convenient way to load the full image after loading
+// the metadata.
+//
+// Returns nil if the no image format was recognized. Returns an error if there
+// was an error decoding metadata.
+func Load(r io.Reader) (md *meta.Data, imgStream io.Reader, err error) {
+	for _, loader := range loaders {
+		r, err = streams.CallbackWithSeekable(r, func(r io.Reader) (err error) {
+			md, err = loader(r)
+			return
+		})
+		switch {
+		case err != nil:
+			return nil, r, err
+		case md != nil:
+			return md, r, nil
+		}
+	}
+	return nil, r, nil
+}

Server/vendor/github.com/kovidgoyal/imaging/prism/meta/autometa/doc.go

@@ -0,0 +1,3 @@
+// Package autometa provides support for embedded metadata and automatic
+// detection of image formats.
+package autometa