func parseOffsetAndSizeFromHeaders()

in oss/utils.go [221:266]

39 lines of code
10 McCabe index (conditional complexity)


func parseOffsetAndSizeFromHeaders(headers http.Header) (offset, size int64) {
	size = -1
	var contentLength = headers.Get("Content-Length")
	if len(contentLength) != 0 {
		var err error
		if size, err = strconv.ParseInt(contentLength, 10, 64); err != nil {
			return 0, -1
		}
	}

	var contentRange = headers.Get("Content-Range")
	if len(contentRange) == 0 {
		return 0, size
	}

	if !strings.HasPrefix(contentRange, "bytes ") {
		return 0, -1
	}

	// start offset
	dash := strings.IndexRune(contentRange, '-')
	if dash < 0 {
		return 0, -1
	}
	ret, err := strconv.ParseInt(contentRange[6:dash], 10, 64)
	if err != nil {
		return 0, -1
	}
	offset = ret

	// total size
	slash := strings.IndexRune(contentRange, '/')
	if slash < 0 {
		return 0, -1
	}
	tsize := contentRange[slash+1:]
	if tsize != "*" {
		ret, err = strconv.ParseInt(contentRange[slash+1:], 10, 64)
		if err != nil {
			return 0, -1
		}
		size = ret
	}

	return offset, size
}