From f4512d3c6cd6765d0623c039febcabd1225ed908 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <brad@danga.com>
Date: Sun, 29 May 2011 10:38:21 -0700
Subject: [PATCH] blobref: add Sha1FromString helper and SizedBlobRef
 Equal/String

---
 lib/go/camli/blobref/blobref.go | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/lib/go/camli/blobref/blobref.go b/lib/go/camli/blobref/blobref.go
index a43eba5a5..f1a871f5d 100644
--- a/lib/go/camli/blobref/blobref.go
+++ b/lib/go/camli/blobref/blobref.go
@@ -48,6 +48,14 @@ type SizedBlobRef struct {
 	Size int64
 }
 
+func (sb *SizedBlobRef) Equal(o SizedBlobRef) bool {
+	return sb.Size == o.Size && sb.BlobRef.String() == o.BlobRef.String()
+}
+
+func (sb *SizedBlobRef) String() string {
+	return fmt.Sprintf("[%s %d bytes]", sb.BlobRef.String(), sb.Size)
+}
+
 type ReadSeekCloser interface {
 	io.Reader
 	io.Seeker
@@ -122,8 +130,14 @@ func blobIfValid(hashname, digest string) *BlobRef {
 	return newBlob(hashname, digest)
 }
 
-func FromHash(name string, h hash.Hash) *BlobRef {
-	return newBlob(name, fmt.Sprintf("%x", h.Sum()))
+func FromHash(hashfunc string, h hash.Hash) *BlobRef {
+	return newBlob(hashfunc, fmt.Sprintf("%x", h.Sum()))
+}
+
+func Sha1FromString(s string) *BlobRef {
+	s1 := sha1.New()
+	s1.Write([]byte(s))
+	return FromHash("sha1", s1)
 }
 
 // FromPattern takes a pattern and if it matches 's' with two exactly two valid