From fbb0dfed47c907f9f97500967491aad85c92577a Mon Sep 17 00:00:00 2001
From: Nazar Kanaev <nkanaev@live.com>
Date: Wed, 7 Apr 2021 10:25:30 +0100
Subject: [PATCH] remove bom

---
 doc/formats.txt         |  1 +
 src/parser/feed.go      |  1 +
 src/parser/feed_test.go | 15 +++++++++++++++
 3 files changed, 17 insertions(+)

diff --git a/doc/formats.txt b/doc/formats.txt
index 9d63771..8f6951c 100644
--- a/doc/formats.txt
+++ b/doc/formats.txt
@@ -152,6 +152,7 @@ The parser should be reasonably handle content provided by them.
 Delete any from the list in case they drop support of web feeds.
 
 - blogger
+- cnblogs
 - flickr
 - hatenablog
 - livejournal
diff --git a/src/parser/feed.go b/src/parser/feed.go
index 28e4d16..2d7cc00 100644
--- a/src/parser/feed.go
+++ b/src/parser/feed.go
@@ -17,6 +17,7 @@ type processor func(r io.Reader) (*Feed, error)
 
 func sniff(lookup string) (string, processor) {
 	lookup = strings.TrimSpace(lookup)
+	lookup = strings.TrimLeft(lookup, "\x00\xEF\xBB\xBF\xFE\xFF")
 	switch lookup[0] {
 	case '<':
 		decoder := xmlDecoder(strings.NewReader(lookup))
diff --git a/src/parser/feed_test.go b/src/parser/feed_test.go
index 5b4f9d8..223ac3f 100644
--- a/src/parser/feed_test.go
+++ b/src/parser/feed_test.go
@@ -92,3 +92,18 @@ func TestParseShortFeed(t *testing.T) {
 		t.FailNow()
 	}
 }
+
+func TestParseFeedWithBOM(t *testing.T) {
+	have, err := Parse(strings.NewReader(
+		"\xEF\xBB\xBF" + `<?xml version="1.0"?><feed xmlns="http://www.w3.org/2005/Atom"></feed>`,
+	))
+	want := &Feed{}
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(want, have) {
+		t.Logf("want: %#v", want)
+		t.Logf("have: %#v", have)
+		t.FailNow()
+	}
+}