4 files changed, 25 insertions, 18 deletions
diff --git a/vendor/github.com/lunixbochs/struc/field.go b/vendor/github.com/lunixbochs/struc/field.go
index 4af10a7..5ab7da6 100644
--- a/vendor/github.com/lunixbochs/struc/field.go
+++ b/vendor/github.com/lunixbochs/struc/field.go
@@ -10,7 +10,6 @@ import (
 
 type Field struct {
 	Name     string
-	CanSet   bool
 	Ptr      bool
 	Index    int
 	Type     Type
diff --git a/vendor/github.com/lunixbochs/struc/fields.go b/vendor/github.com/lunixbochs/struc/fields.go
index 80e2045..5d591bf 100644
--- a/vendor/github.com/lunixbochs/struc/fields.go
+++ b/vendor/github.com/lunixbochs/struc/fields.go
@@ -12,14 +12,18 @@ type Fields []*Field
 
 func (f Fields) SetByteOrder(order binary.ByteOrder) {
 	for _, field := range f {
-		field.Order = order
+		if field != nil {
+			field.Order = order
+		}
 	}
 }
 
 func (f Fields) String() string {
 	fields := make([]string, len(f))
 	for i, field := range f {
-		fields[i] = field.String()
+		if field != nil {
+			fields[i] = field.String()
+		}
 	}
 	return "{" + strings.Join(fields, ", ") + "}"
 }
@@ -30,9 +34,8 @@ func (f Fields) Sizeof(val reflect.Value, options *Options) int {
 	}
 	size := 0
 	for i, field := range f {
-		v := val.Field(i)
-		if v.CanSet() {
-			size += field.Size(v, options)
+		if field != nil {
+			size += field.Size(val.Field(i), options)
 		}
 	}
 	return size
@@ -63,7 +66,7 @@ func (f Fields) Pack(buf []byte, val reflect.Value, options *Options) (int, erro
 	}
 	pos := 0
 	for i, field := range f {
-		if !field.CanSet {
+		if field == nil {
 			continue
 		}
 		v := val.Field(i)
@@ -106,7 +109,7 @@ func (f Fields) Unpack(r io.Reader, val reflect.Value, options *Options) error {
 	var tmp [8]byte
 	var buf []byte
 	for i, field := range f {
-		if !field.CanSet {
+		if field == nil {
 			continue
 		}
 		v := val.Field(i)
diff --git a/vendor/github.com/lunixbochs/struc/parse.go b/vendor/github.com/lunixbochs/struc/parse.go
index 5a30d53..060f43d 100644
--- a/vendor/github.com/lunixbochs/struc/parse.go
+++ b/vendor/github.com/lunixbochs/struc/parse.go
@@ -13,12 +13,11 @@ import (
 
 // struc:"int32,big,sizeof=Data"
 
-var tagWordsRe = regexp.MustCompile(`(\[|\b)[^"]+\b+$`)
-
 type strucTag struct {
 	Type   string
 	Order  binary.ByteOrder
 	Sizeof string
+	Skip   bool
 }
 
 func parseStrucTag(tag reflect.StructTag) *strucTag {
@@ -40,6 +39,8 @@ func parseStrucTag(tag reflect.StructTag) *strucTag {
 			t.Order = binary.BigEndian
 		} else if s == "little" {
 			t.Order = binary.LittleEndian
+		} else if s == "skip" {
+			t.Skip = true
 		} else {
 			t.Type = s
 		}
@@ -49,8 +50,8 @@ func parseStrucTag(tag reflect.StructTag) *strucTag {
 
 var typeLenRe = regexp.MustCompile(`^\[(\d*)\]`)
 
-func parseField(f reflect.StructField) (fd *Field, err error) {
-	tag := parseStrucTag(f.Tag)
+func parseField(f reflect.StructField) (fd *Field, tag *strucTag, err error) {
+	tag = parseStrucTag(f.Tag)
 	var ok bool
 	fd = &Field{
 		Name:  f.Name,
@@ -124,19 +125,20 @@ func parseFieldsLocked(v reflect.Value) (Fields, error) {
 		return nil, errors.New("struc: Struct has no fields.")
 	}
 	sizeofMap := make(map[string][]int)
-	fields := make(Fields, 0, v.NumField())
+	fields := make(Fields, v.NumField())
 	for i := 0; i < t.NumField(); i++ {
 		field := t.Field(i)
-		f, err := parseField(field)
+		f, tag, err := parseField(field)
+		if tag.Skip {
+			continue
+		}
 		if err != nil {
 			return nil, err
 		}
-		f.CanSet = v.Field(i).CanSet()
-		if !f.CanSet {
+		if !v.Field(i).CanSet() {
 			continue
 		}
 		f.Index = i
-		tag := parseStrucTag(field.Tag)
 		if tag.Sizeof != "" {
 			target, ok := t.FieldByName(tag.Sizeof)
 			if !ok {
@@ -166,7 +168,7 @@ func parseFieldsLocked(v reflect.Value) (Fields, error) {
 				return nil, err
 			}
 		}
-		fields = append(fields, f)
+		fields[i] = f
 	}
 	return fields, nil
 }
diff --git a/vendor/github.com/lunixbochs/struc/struc_test.go b/vendor/github.com/lunixbochs/struc/struc_test.go
index 939c3e3..4b50707 100644
--- a/vendor/github.com/lunixbochs/struc/struc_test.go
+++ b/vendor/github.com/lunixbochs/struc/struc_test.go
@@ -55,6 +55,8 @@ type Example struct {
 	NestedSize int      `struc:"sizeof=NestedA"` // 00 00 00 02
 	NestedA    []Nested // [00 00 00 03, 00 00 00 04]
 
+	Skip int `struc:"skip"`
+
 	CustomTypeSize    Int3   `struc:"sizeof=CustomTypeSizeArr"` // 00 00 00 04
 	CustomTypeSizeArr []byte // "ABCD"
 }
@@ -71,6 +73,7 @@ var reference = &Example{
 	4, []byte("5678"),
 	Nested{1}, &Nested{2}, &five,
 	6, []Nested{{3}, {4}, {5}, {6}, {7}, {8}},
+	0,
 	Int3(4), []byte("ABCD"),
 }