tga

internal/builtins/tga.go

@@ -0,0 +1,8 @@
+//go:build tga || full
+// +build tga full
+
+package builtins
+
+import (
+	_ "github.com/coalaura/ffwebp/internal/codec/tga"
+)

internal/codec/detect.go

@@ -29,7 +29,19 @@ func (s *Sniffed) String() string {
 	return builder.String()
 }
 
-func Sniff(reader io.Reader) (*Sniffed, io.Reader, error) {
+func Sniff(reader io.Reader, input string) (*Sniffed, io.Reader, error) {
+	ext := strings.ToLower(strings.TrimPrefix(filepath.Ext(input), "."))
+	if ext != "" {
+		codec, _ := FindCodec(ext)
+		if codec != nil {
+			return &Sniffed{
+				Header:     []byte("." + ext),
+				Confidence: 100,
+				Codec:      codec,
+			}, reader, nil
+		}
+	}
+
 	buf, err := io.ReadAll(reader)
 	if err != nil {
 		return nil, nil, err

internal/codec/tga/tga.go

@@ -0,0 +1,77 @@
+package tga
+
+import (
+	"image"
+	"io"
+
+	"github.com/ftrvxmtrx/tga"
+
+	"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) String() string {
+	return "tga"
+}
+
+func (impl) Extensions() []string {
+	return []string{"tga"}
+}
+
+func (impl) CanEncode() bool {
+	return true
+}
+
+func (impl) Flags(flags []cli.Flag) []cli.Flag {
+	return flags
+}
+
+func (impl) Sniff(reader io.ReaderAt) (int, []byte, error) {
+	buf := make([]byte, 3)
+
+	if _, err := reader.ReadAt(buf, 0); err != nil {
+		return 0, nil, err
+	}
+
+	colorMapType := buf[1]
+
+	if colorMapType > 1 {
+		return 0, nil, nil
+	}
+
+	validImageTypes := map[byte]bool{
+		0:  true, // no image data
+		1:  true, // colormapped, uncompressed
+		2:  true, // truecolor, uncompressed
+		3:  true, // grayscale, uncompressed
+		9:  true, // colormapped, RLE
+		10: true, // truecolor, RLE
+		11: true, // grayscale, RLE
+	}
+
+	imageType := buf[2]
+
+	if !validImageTypes[imageType] {
+		return 0, nil, nil
+	}
+
+	header := make([]byte, 3)
+	copy(header, buf)
+
+	return 100, header, nil
+}
+
+func (impl) Decode(reader io.Reader) (image.Image, error) {
+	return tga.Decode(reader)
+}
+
+func (impl) Encode(writer io.Writer, img image.Image, _ opts.Common) error {
+	return tga.Encode(writer, img)
+}