Add a GIF mime type, TODOs, add camdebug mime command.

Change-Id: Ic8930d4250dec30ed8c9a056c1cecd70cc447f9d

cmd/camdebug/camdebug.go

@@ -18,18 +18,22 @@ package main
 
 import (
 	"flag"
-	"log"
 )
 
-var flagSplits = flag.Bool("splits", false, "show splits")
+var (
+	flagSplits = flag.Bool("splits", false, "show splits of provided filename")
+	flagMIME = flag.Bool("mime", false, "show MIME type of provided file")
+)
 
 func main() {
 	flag.Parse()
-
+	if *flagMIME {
+		showMIME()
+		return
+	}
 	if *flagSplits {
 		showSplits()
 		return
 	}
-
+	flag.Usage()
-	log.Fatalf("TODO: usage info")
 }

cmd/camdebug/mime.go

@@ -0,0 +1,36 @@
+/*
+Copyright 2012 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"
+	"log"
+	"fmt"
+	"os"
+	
+	"camlistore.org/pkg/magic"
+)
+
+func showMIME() {
+	file := flag.Arg(0)
+	f, err := os.Open(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	mime, _ := magic.MimeTypeFromReader(f)
+	fmt.Println(mime)
+}

cmd/camdebug/splits.go

@@ -94,4 +94,5 @@ func showSplits() {
 		}
 	}
 	dumpSpans(spans, 0)
+	fmt.Printf("\n\nNOTE NOTE NOTE: the camdebug tool hasn't been updated to use the splitting policy from pkg/schema/filewriter.go.")
 }

pkg/magic/magic.go

@@ -29,12 +29,15 @@ type prefixEntry struct {
 }
 
 var prefixTable = []prefixEntry{
+	{[]byte("GIF87a"), "image/gif"},
+	{[]byte("GIF89a"), "image/gif"}, // TODO: Others?
 	{[]byte("\xff\xd8\xff\xe2"), "image/jpeg"},
 	{[]byte("\xff\xd8\xff\xe1"), "image/jpeg"},
 	{[]byte("\xff\xd8\xff\xe0"), "image/jpeg"},
 	{[]byte("\xff\xd8\xff\xdb"), "image/jpeg"},
 	{[]byte{137, 'P', 'N', 'G', '\r', '\n', 26, 10}, "image/png"},
 	{[]byte("-----BEGIN PGP PUBLIC KEY BLOCK---"), "text/x-openpgp-public-key"},
+	// TODO(bradfitz): popular audio & video formats at least
 }
 
 // Returns the emptry string if unknown.