feat: support mulit/range (#1398)

* feat: support mulit/range

* fix:
1. lint code
2. add SetByteRanges method

* fix: reduce the test number of testFSSingleByteRange

1 files changed, 18 insertions, 9 deletions

diff --git a/header.go b/header.go
index fe4f669..8292767 100644
--- a/header.go
+++ b/header.go
@@ -113,24 +113,33 @@ func (h *ResponseHeader) SetContentRange(startPos, endPos, contentLength int) {
 //
 //   - If startPos is negative, then 'bytes=-startPos' value is set.
 //   - If endPos is negative, then 'bytes=startPos-' value is set.
-func (h *RequestHeader) SetByteRange(startPos, endPos int) {
+func (h *RequestHeader) SetByteRanges(startPos, endPos []int) {
 	b := h.bufKV.value[:0]
 	b = append(b, strBytes...)
 	b = append(b, '=')
-	if startPos >= 0 {
-		b = AppendUint(b, startPos)
-	} else {
-		endPos = -startPos
-	}
-	b = append(b, '-')
-	if endPos >= 0 {
-		b = AppendUint(b, endPos)
+	for i := range startPos {
+		if i > 0 {
+			b = append(b, ',')
+		}
+		if startPos[i] >= 0 {
+			b = AppendUint(b, startPos[i])
+		} else {
+			endPos[i] = -startPos[i]
+		}
+		b = append(b, '-')
+		if endPos[i] >= 0 {
+			b = AppendUint(b, endPos[i])
+		}
 	}
 	h.bufKV.value = b
 
 	h.setNonSpecial(strRange, h.bufKV.value)
 }
 
+func (h *RequestHeader) SetByteRange(startPos, endPos int) {
+	h.SetByteRanges([]int{startPos}, []int{endPos})
+}
+
 // StatusCode returns response status code.
 func (h *ResponseHeader) StatusCode() int {
 	if h.statusCode == 0 {