1 files changed, 104 insertions, 0 deletions
diff --git a/libgo/go/mime/type.go b/libgo/go/mime/type.go
new file mode 100644
index 000000000..a10b780ae
--- /dev/null
+++ b/libgo/go/mime/type.go
@@ -0,0 +1,104 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The mime package implements parts of the MIME spec.
+package mime
+
+import (
+	"bufio"
+	"os"
+	"strings"
+	"sync"
+)
+
+var typeFiles = []string{
+	"/etc/mime.types",
+	"/etc/apache2/mime.types",
+	"/etc/apache/mime.types",
+}
+
+var mimeTypes = map[string]string{
+	".css":  "text/css",
+	".gif":  "image/gif",
+	".htm":  "text/html; charset=utf-8",
+	".html": "text/html; charset=utf-8",
+	".jpg":  "image/jpeg",
+	".js":   "application/x-javascript",
+	".pdf":  "application/pdf",
+	".png":  "image/png",
+	".xml":  "text/xml; charset=utf-8",
+}
+
+var mimeLock sync.RWMutex
+
+func loadMimeFile(filename string) {
+	f, err := os.Open(filename, os.O_RDONLY, 0666)
+	if err != nil {
+		return
+	}
+
+	reader := bufio.NewReader(f)
+	for {
+		line, err := reader.ReadString('\n')
+		if err != nil {
+			f.Close()
+			return
+		}
+		fields := strings.Fields(line)
+		if len(fields) <= 1 || fields[0][0] == '#' {
+			continue
+		}
+		typename := fields[0]
+		if strings.HasPrefix(typename, "text/") {
+			typename += "; charset=utf-8"
+		}
+		for _, ext := range fields[1:] {
+			if ext[0] == '#' {
+				break
+			}
+			mimeTypes["."+ext] = typename
+		}
+	}
+}
+
+func initMime() {
+	for _, filename := range typeFiles {
+		loadMimeFile(filename)
+	}
+}
+
+var once sync.Once
+
+// TypeByExtension returns the MIME type associated with the file extension ext.
+// The extension ext should begin with a leading dot, as in ".html".
+// When ext has no associated type, TypeByExtension returns "".
+//
+// The built-in table is small but is is augmented by the local
+// system's mime.types file(s) if available under one or more of these
+// names:
+//
+//   /etc/mime.types
+//   /etc/apache2/mime.types
+//   /etc/apache/mime.types
+func TypeByExtension(ext string) string {
+	once.Do(initMime)
+	mimeLock.RLock()
+	typename := mimeTypes[ext]
+	mimeLock.RUnlock()
+	return typename
+}
+
+// AddExtensionType sets the MIME type associated with
+// the extension ext to typ.  The extension should begin with
+// a leading dot, as in ".html".
+func AddExtensionType(ext, typ string) os.Error {
+	once.Do(initMime)
+	if len(ext) < 1 || ext[0] != '.' {
+		return os.EINVAL
+	}
+	mimeLock.Lock()
+	mimeTypes[ext] = typ
+	mimeLock.Unlock()
+	return nil
+}