bmp

go.mod

@@ -7,4 +7,4 @@ require (
 	github.com/urfave/cli/v3 v3.3.8
 )
 
-require golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 // indirect
+require golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8

internal/codec/bmp/bmp.go

@@ -0,0 +1,55 @@
+package bmp
+
+import (
+	"bytes"
+	"image"
+	"io"
+
+	"golang.org/x/image/bmp"
+
+	"github.com/coalaura/ffwebp/internal/codec"
+	"github.com/coalaura/ffwebp/internal/opts"
+	"github.com/urfave/cli/v3"
+)
+
+func init() {
+	codec.Register(impl{})
+}
+
+type impl struct{}
+
+func (impl) Name() string {
+	return "bmp"
+}
+
+func (impl) Extensions() []string {
+	return []string{"bmp"}
+}
+
+func (impl) Flags(flags []cli.Flag) []cli.Flag {
+	return flags
+}
+
+func (impl) Sniff(reader io.ReaderAt) (int, error) {
+	magic := []byte{0x42, 0x4D}
+
+	buf := make([]byte, 2)
+
+	if _, err := reader.ReadAt(buf, 0); err != nil {
+		return 0, err
+	}
+
+	if bytes.Equal(buf, magic) {
+		return 100, nil
+	}
+
+	return 0, nil
+}
+
+func (impl) Decode(reader io.Reader) (image.Image, error) {
+	return bmp.Decode(reader)
+}
+
+func (impl) Encode(writer io.Writer, img image.Image, options opts.Common) error {
+	return bmp.Encode(writer, img)
+}