working commit

pkg/auxhttp/crange.go

@@ -0,0 +1,88 @@
+package auxhttp
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func ParseOCIContentRange(ref string) (int64, int64, error) {
+	var start, end int64
+	var err error
+
+	startstop := strings.TrimSpace(ref)
+	tmp := strings.SplitN(startstop, "-", 2)
+	if len(tmp) != 2 {
+		err = fmt.Errorf("Wrong Content-Range definition, strange range def %v", startstop)
+		return start, end, err
+	}
+	startstr := tmp[0]
+	endstr := tmp[1]
+
+	start, err = strconv.ParseInt(startstr, 10, 64)
+	if err != nil {
+		err = fmt.Errorf("Wrong Content-Range definition, strange start %s", startstr)
+		return start, end, err
+	}
+	end, err = strconv.ParseInt(endstr, 10, 64)
+	if err != nil {
+		err = fmt.Errorf("Wrong Content-Range definition, strange end %s", endstr)
+		return start, end, err
+	}
+	return start, end, err
+}
+
+func ParseContentRange(ref string) (int64, int64, int64, error) {
+	var start, end, total int64
+	var err error
+
+	const bytesUnit = "bytes"
+
+	tmp := strings.SplitN(ref, " ", 2)
+	if len(tmp) != 2 {
+		err := fmt.Errorf("Wrong Content-Range definition, len is only %d", len(tmp))
+		return start, end, total, err
+	}
+	unit := strings.ToLower(tmp[0])
+	if unit != bytesUnit {
+		err = fmt.Errorf("Wrong Content-Range definition, strange length def %s", unit)
+		return start, end, total, err
+	}
+	ranger := strings.TrimSpace(tmp[1])
+
+	tmp = strings.Split(ranger, "/")
+	if len(tmp) != 2 {
+		err = fmt.Errorf("Wrong Content-Range definition, dont found total")
+		return start, end, total, err
+	}
+	totalstr := tmp[1]
+	if totalstr == "*" {
+		total = 0
+	} else {
+		total, err = strconv.ParseInt(totalstr, 10, 64)
+		if err != nil {
+			return start, end, total, err
+		}
+	}
+	startstop := tmp[0]
+	tmp = strings.SplitN(startstop, "-", 2)
+	if len(tmp) != 2 {
+		err = fmt.Errorf("Wrong Content-Range definition, strange range def %v", startstop)
+		return start, end, total, err
+	}
+	startstr := tmp[0]
+	endstr := tmp[1]
+
+	start, err = strconv.ParseInt(startstr, 10, 64)
+	if err != nil {
+		err = fmt.Errorf("Wrong Content-Range definition, strange start %s", startstr)
+		return start, end, total, err
+	}
+	end, err = strconv.ParseInt(endstr, 10, 64)
+	if err != nil {
+		err = fmt.Errorf("Wrong Content-Range definition, strange end %s", endstr)
+		return start, end, total, err
+	}
+	return start, end, total, err
+}