From ebd42dc4fd7dcf78b2d87fdcbfd2f67078f37503 Mon Sep 17 00:00:00 2001
From: Laura <milanbartky@gmail.com>
Date: Tue, 12 Aug 2025 15:47:54 +0200
Subject: [PATCH] --sniff

---
 cmd/ffwebp/main.go       |  7 ++++++-
 internal/codec/detect.go | 22 ++++++++++++----------
 2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/cmd/ffwebp/main.go b/cmd/ffwebp/main.go
index 0b48a17..5fc614b 100644
--- a/cmd/ffwebp/main.go
+++ b/cmd/ffwebp/main.go
@@ -37,6 +37,11 @@ func main() {
 			Aliases: []string{"c"},
 			Usage:   "force output codec (jpeg, png, ...)",
 		},
+		&cli.BoolFlag{
+			Name:    "sniff",
+			Aliases: []string{"f"},
+			Usage:   "force sniffing of input codec (ignore extension)",
+		},
 		&cli.IntFlag{
 			Name:    "quality",
 			Aliases: []string{"q"},
@@ -117,7 +122,7 @@ func run(_ context.Context, cmd *cli.Command) error {
 		logx.Printf("reading input from <stdin>\n")
 	}
 
-	sniffed, reader, err := codec.Sniff(reader, input)
+	sniffed, reader, err := codec.Sniff(reader, input, cmd.Bool("sniff"))
 	if err != nil {
 		return err
 	}
diff --git a/internal/codec/detect.go b/internal/codec/detect.go
index 3262a9b..291a968 100644
--- a/internal/codec/detect.go
+++ b/internal/codec/detect.go
@@ -29,16 +29,18 @@ func (s *Sniffed) String() string {
 	return builder.String()
 }
 
-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
+func Sniff(reader io.Reader, input string, ignoreExtension bool) (*Sniffed, io.Reader, error) {
+	if !ignoreExtension {
+		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
+			}
 		}
 	}