Add support for string types

[govpp.git] / vendor / github.com / lunixbochs / struc / parse.go

diff --git a/vendor/github.com/lunixbochs/struc/parse.go b/vendor/github.com/lunixbochs/struc/parse.go
index 060f43d..43c5875 100644 (file)
--- a/vendor/github.com/lunixbochs/struc/parse.go
+++ b/vendor/github.com/lunixbochs/struc/parse.go
@@ -11,13 +11,14 @@ import (
        "sync"
 )
 
-// struc:"int32,big,sizeof=Data"
+// struc:"int32,big,sizeof=Data,skip,sizefrom=Len"
 
 type strucTag struct {
-       Type   string
-       Order  binary.ByteOrder
-       Sizeof string
-       Skip   bool
+       Type     string
+       Order    binary.ByteOrder
+       Sizeof   string
+       Skip     bool
+       Sizefrom string
 }
 
 func parseStrucTag(tag reflect.StructTag) *strucTag {
@@ -35,6 +36,9 @@ func parseStrucTag(tag reflect.StructTag) *strucTag {
                if strings.HasPrefix(s, "sizeof=") {
                        tmp := strings.SplitN(s, "=", 2)
                        t.Sizeof = tmp[1]
+               } else if strings.HasPrefix(s, "sizefrom=") {
+                       tmp := strings.SplitN(s, "=", 2)
+                       t.Sizefrom = tmp[1]
                } else if s == "big" {
                        t.Order = binary.BigEndian
                } else if s == "little" {
@@ -150,6 +154,13 @@ func parseFieldsLocked(v reflect.Value) (Fields, error) {
                if sizefrom, ok := sizeofMap[field.Name]; ok {
                        f.Sizefrom = sizefrom
                }
+               if tag.Sizefrom != "" {
+                       source, ok := t.FieldByName(tag.Sizefrom)
+                       if !ok {
+                               return nil, fmt.Errorf("struc: `sizefrom=%s` field does not exist", tag.Sizefrom)
+                       }
+                       f.Sizefrom = source.Index
+               }
                if f.Len == -1 && f.Sizefrom == nil {
                        return nil, fmt.Errorf("struc: field `%s` is a slice with no length or sizeof field", field.Name)
                }