diff options
Diffstat (limited to 'vendor/github.com/hashicorp/go-msgpack/codec/helper_internal.go')
-rw-r--r-- | vendor/github.com/hashicorp/go-msgpack/codec/helper_internal.go | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/go-msgpack/codec/helper_internal.go b/vendor/github.com/hashicorp/go-msgpack/codec/helper_internal.go new file mode 100644 index 000000000..58417da95 --- /dev/null +++ b/vendor/github.com/hashicorp/go-msgpack/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 +} |