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// Copyright 2009 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package gob

import "fmt"

// Errors in decoding and encoding are handled using panic and recover.

// Panics caused by user error (that is, everything except run-time panics

// such as "index out of bounds" errors) do not leave the file that caused

// them, but are instead turned into plain error returns.  Encoding and

// decoding functions and methods that do not return an error either use

// panic to report an error or are guaranteed error-free.

// A gobError is used to distinguish errors (panics) generated in this package.

type gobError struct {

        err error

}

// errorf is like error_ but takes Printf-style arguments to construct an error.

// It always prefixes the message with "gob: ".

func errorf(format string, args ...interface{}) {

        error_(fmt.Errorf("gob: "+format, args...))

}

// error wraps the argument error and uses it as the argument to panic.

func error_(err error) {

        panic(gobError{err})

}

// catchError is meant to be used as a deferred function to turn a panic(gobError) into a

// plain error.  It overwrites the error return of the function that deferred its call.

func catchError(err *error) {

        if e := recover(); e != nil {

                ge, ok := e.(gobError)

                if !ok {

                        panic(e)

                }

                *err = ge.err

        }

        return

}