Conver to regular Go vendor + dep tool

vendor/github.com/ugorji/go/codec/helper_internal.go

@@ -0,0 +1,127 @@
+// Copyright (c) 2012, 2013 Ugorji Nwoke. All rights reserved.
+// Use of this source code is governed by a BSD-style license found in the LICENSE file.
+
+package codec
+
+// All non-std package dependencies live in this file,
+// so porting to different environment is easy (just update functions).
+
+import (
+	"errors"
+	"fmt"
+	"math"
+	"reflect"
+)
+
+var (
+	raisePanicAfterRecover = false
+	debugging              = true
+)
+
+func panicValToErr(panicVal interface{}, err *error) {
+	switch xerr := panicVal.(type) {
+	case error:
+		*err = xerr
+	case string:
+		*err = errors.New(xerr)
+	default:
+		*err = fmt.Errorf("%v", panicVal)
+	}
+	if raisePanicAfterRecover {
+		panic(panicVal)
+	}
+	return
+}
+
+func isEmptyValueDeref(v reflect.Value, deref bool) bool {
+	switch v.Kind() {
+	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
+		return v.Len() == 0
+	case reflect.Bool:
+		return !v.Bool()
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return v.Int() == 0
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return v.Uint() == 0
+	case reflect.Float32, reflect.Float64:
+		return v.Float() == 0
+	case reflect.Interface, reflect.Ptr:
+		if deref {
+			if v.IsNil() {
+				return true
+			}
+			return isEmptyValueDeref(v.Elem(), deref)
+		} else {
+			return v.IsNil()
+		}
+	case reflect.Struct:
+		// return true if all fields are empty. else return false.
+
+		// we cannot use equality check, because some fields may be maps/slices/etc
+		// and consequently the structs are not comparable.
+		// return v.Interface() == reflect.Zero(v.Type()).Interface()
+		for i, n := 0, v.NumField(); i < n; i++ {
+			if !isEmptyValueDeref(v.Field(i), deref) {
+				return false
+			}
+		}
+		return true
+	}
+	return false
+}
+
+func isEmptyValue(v reflect.Value) bool {
+	return isEmptyValueDeref(v, true)
+}
+
+func debugf(format string, args ...interface{}) {
+	if debugging {
+		if len(format) == 0 || format[len(format)-1] != '\n' {
+			format = format + "\n"
+		}
+		fmt.Printf(format, args...)
+	}
+}
+
+func pruneSignExt(v []byte, pos bool) (n int) {
+	if len(v) < 2 {
+	} else if pos && v[0] == 0 {
+		for ; v[n] == 0 && n+1 < len(v) && (v[n+1]&(1<<7) == 0); n++ {
+		}
+	} else if !pos && v[0] == 0xff {
+		for ; v[n] == 0xff && n+1 < len(v) && (v[n+1]&(1<<7) != 0); n++ {
+		}
+	}
+	return
+}
+
+func implementsIntf(typ, iTyp reflect.Type) (success bool, indir int8) {
+	if typ == nil {
+		return
+	}
+	rt := typ
+	// The type might be a pointer and we need to keep
+	// dereferencing to the base type until we find an implementation.
+	for {
+		if rt.Implements(iTyp) {
+			return true, indir
+		}
+		if p := rt; p.Kind() == reflect.Ptr {
+			indir++
+			if indir >= math.MaxInt8 { // insane number of indirections
+				return false, 0
+			}
+			rt = p.Elem()
+			continue
+		}
+		break
+	}
+	// No luck yet, but if this is a base type (non-pointer), the pointer might satisfy.
+	if typ.Kind() != reflect.Ptr {
+		// Not a pointer, but does the pointer work?
+		if reflect.PtrTo(typ).Implements(iTyp) {
+			return true, -1
+		}
+	}
+	return false, 0
+}