Add the ability to acces the raw feed data

feed.go

@@ -1,6 +1,7 @@
 package gofeed
 
 import (
+	"bytes"
 	"encoding/json"
 	"time"
 
@@ -11,6 +12,7 @@ import (
 // and rss.Feed gets translated to. It represents
 // a web feed.
 type Feed struct {
+	RawFeed         bytes.Buffer             `json:"-"`
 	Title           string                   `json:"title,omitempty"`
 	Description     string                   `json:"description,omitempty"`
 	Link            string                   `json:"link,omitempty"`

parser.go

@@ -55,19 +55,27 @@ func (f *Parser) Parse(feed io.Reader) (*Feed, error) {
 	// DetectFeedType function and construct a new
 	// reader with those bytes intact for when we
 	// attempt to parse the feeds.
-	var buf bytes.Buffer
+	var buf, copyBuffer bytes.Buffer
 	tee := io.TeeReader(feed, &buf)
 	feedType := DetectFeedType(tee)
 
 	// Glue the read bytes from the detect function
 	// back into a new reader
-	r := io.MultiReader(&buf, feed)
 
+	r := io.TeeReader(io.MultiReader(&buf, feed), &copyBuffer)
 	switch feedType {
 	case FeedTypeAtom:
-		return f.parseAtomFeed(r)
+		atomFeed, err := f.parseAtomFeed(r)
+		if atomFeed != nil {
+			atomFeed.RawFeed = copyBuffer
+		}
+		return atomFeed, err
 	case FeedTypeRSS:
-		return f.parseRSSFeed(r)
+		rssFeed, err := f.parseRSSFeed(r)
+		if rssFeed != nil {
+			rssFeed.RawFeed = copyBuffer
+		}
+		return rssFeed, err
 	}
 
 	return nil, ErrFeedTypeNotDetected