compress/gzip: cleanup gzip package

Changes made:
* Reader.flg is not used anywhere else other than readHeader and
does not need to be stored.
* Store Reader.digest and Writer.digest as uint32s rather than as
a hash.Hash32 and use the crc32.Update function instead. This simplifies
initialization logic since the zero value of uint32 is the initial
CRC-32 value. There are no performance detriments to doing this since
the hash.Hash32 returned by crc32 simply calls crc32.Update as well.
* s/[0:/[:/            Consistently use shorter notation for slicing.
* s/RFC1952/RFC 1952/  Consistently use RFC notation.

Change-Id: I55416a19f4836cbed943adaa3f672538ea5d166d
Reviewed-on: https://go-review.googlesource.com/21429
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Joe Tsai <joetsai@digital-static.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compress/gzip/gunzip_test.go b/src/compress/gzip/gunzip_test.go
index 007d9585ce..593644ac1b 100644
--- a/src/compress/gzip/gunzip_test.go
+++ b/src/compress/gzip/gunzip_test.go
@@ -411,7 +411,7 @@ Found:
 }
 
 func TestNilStream(t *testing.T) {
-	// Go liberally interprets RFC1952 section 2.2 to mean that a gzip file
+	// Go liberally interprets RFC 1952 section 2.2 to mean that a gzip file
 	// consist of zero or more members. Thus, we test that a nil stream is okay.
 	_, err := NewReader(bytes.NewReader(nil))
 	if err != io.EOF {