Regenerate v7.tar with a real V7 tar.

Fix octal parsing that it unearthed.

R=rsc
APPROVED=rsc
DELTA=11  (5 added, 0 deleted, 6 changed)
OCL=32924
CL=32945

src/pkg/archive/tar/reader.go

@@ -75,7 +75,12 @@ func cString(b []byte) string {
 }
 
 func (tr *Reader) octal(b []byte) int64 {
-	if len(b) > 0 && b[len(b)-1] == ' ' {
+	// Removing leading spaces.
+	for len(b) > 0 && b[0] == ' ' {
+		b = b[1:len(b)];
+	}
+	// Removing trailing NULs and spaces.
+	for len(b) > 0 && (b[len(b)-1] == ' ' || b[len(b)-1] == '\x00') {
 		b = b[0:len(b)-1];
 	}
 	x, err := strconv.Btoui64(cString(b), 8);

src/pkg/archive/tar/reader_test.go

@@ -84,20 +84,20 @@ var untarTests = []*untarTest{
 		headers: []*Header{
 			&Header{
 				Name: "small.txt",
-				Mode: 0640,
+				Mode: 0444,
 				Uid: 73025,
 				Gid: 5000,
 				Size: 5,
-				Mtime: 1246508266,
+				Mtime: 1244593104,
 				Typeflag: '\x00',
 			},
 			&Header{
 				Name: "small2.txt",
-				Mode: 0640,
+				Mode: 0444,
 				Uid: 73025,
 				Gid: 5000,
 				Size: 11,
-				Mtime: 1245217492,
+				Mtime: 1244593104,
 				Typeflag: '\x00',
 			},
 		},