camdebug: add exif mode; camlistore.org/issue/118

Change-Id: Ifb58580fda9ca35e2f709b65f7a8c6f7b7fb3061

cmd/camdebug/camdebug.go

@@ -22,7 +22,8 @@ import (
 
 var (
 	flagSplits = flag.Bool("splits", false, "show splits of provided filename")
-	flagMIME = flag.Bool("mime", false, "show MIME type of provided file")
+	flagMIME   = flag.Bool("mime", false, "show MIME type of provided file")
+	flagEXIF   = flag.Bool("exif", false, "show EXIF dump of provided file")
 )
 
 func main() {
@@ -35,5 +36,9 @@ func main() {
 		showSplits()
 		return
 	}
+	if *flagEXIF {
+		showEXIF()
+		return
+	}
 	flag.Usage()
 }

cmd/camdebug/exif.go

@@ -0,0 +1,42 @@
+/*
+Copyright 2013 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"camlistore.org/third_party/github.com/camlistore/goexif/exif"
+)
+
+func showEXIF() {
+	file := flag.Arg(0)
+	f, err := os.Open(file)
+	if err != nil {
+		panic(err.Error())
+	}
+	defer f.Close()
+	ex, err := exif.Decode(f)
+	if err != nil {
+		log.Fatalf("exif.Decode: %v", err)
+	}
+	fmt.Printf("exif.Decode = %#v\n", ex)
+	ct, err := ex.DateTime()
+	fmt.Printf("exif.DateTime = %v, %v\n", ct, err)
+}