annotatorreader

package module
v0.0.0-...-45dbe76 Latest Latest
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 Go to latest Published: Jun 22, 2019 License: Apache-2.0 Imports: 7 Imported by: 0

README

Annotator Reader Dumper

Annotate file offsets with meaningful variable names while you marshal structures from a io.Reader.

Why?

Sometimes you need to make sense of weird binary file formats and reading a hex dump while assigning variables usually causes headache. Usually it's one-off error or wrong file offset.

So normally while you are constructing those structs you usually are guessing the types from non-existing documentation. Now you can get a nice clear hex dump of what's going on and where.

Install

go get -u github.com/raspi/annotatorreader

Example

Turn this:

package main

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"github.com/raspi/annotatorreader"
	"log"
)

// First few bytes of Amiga 500 game Turrican II TFMX music from level 1

var testData = []byte{
	0x54, 0x46, 0x4d, 0x58, 0x2d, 0x53, 0x4f, 0x4e, 0x47, 0x20,
	0x0, 0x1, 0x0, 0x0, 0xe, 0x50,

	0x44, 0x61, 0x74, 0x65, 0x20, 0x3a, 0x20, 0x32, 0x33, 0x2e,
	0x30, 0x31, 0x2e, 0x39, 0x31, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,

	0x54, 0x69, 0x6d, 0x65, 0x20, 0x3a, 0x20, 0x31, 0x37, 0x3a,
	0x35, 0x36, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,

	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,

	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,

	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,

	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,

	0x0, 0x1, 0x0, 0x45, 0x0, 0x51, 0x0, 0x5e,
	0x0, 0x61, 0x0, 0x64, 0x0, 0x65, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x44, 0x1, 0xff,

	0x0, 0x44, 0x0, 0x50, 0x0, 0x5d, 0x0, 0x60,
	0x0, 0x63, 0x0, 0x64, 0x0, 0x65, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x4f, 0x1, 0xff,

	0x0, 0x4, 0x0, 0x3, 0x0, 0x3, 0x0, 0x3,
	0x0, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x5,
	0x0, 0x5, 0x0, 0x5, 0x0, 0x5, 0x0, 0x5,
	0x0, 0x5, 0x0, 0x5, 0x0, 0x5, 0x0, 0x5,
	0x0, 0x5, 0x0, 0x5, 0x0, 0x5, 0x0, 0x5,
	0x0, 0x5, 0x0, 0x5, 0x0, 0x5, 0x0, 0x5,
	0x0, 0x5, 0x0, 0x5, 0x0, 0x5, 0x0, 0x5,
	0x0, 0x5, 0x0, 0x5, 0x0, 0x3, 0x0, 0x5,

	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,

	0x0, 0x0, 0x3, 0xe8,

	0x0, 0x0, 0x30, 0x78,

	0x0, 0x0, 0x31, 0xdc,

	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
	0x0, 0x0, 0x0, 0x0,

	0x28, 0x0, 0x63, 0x0, 0x77, 0x18, 0x0, 0x2,
	0x20, 0x1, 0x2, 0x0, 0x76, 0x7f, 0x0, 0x0,
}

type SongRaw struct {
	Header             [10]byte
	Pad                [6]byte
	Text               [6][40]byte
	StartingPositions  [32]uint16
	EndingPositions    [32]uint16
	TempoInformation   [32]uint16
	Mute               [8]int16
	TrackStepPointer   uint32
	PatternDataPointer uint32
	MacroDataPointer   uint32
	Pad2               [36]byte
}

func main() {
	bu := bytes.NewReader(testData)

	var song SongRaw

	a := annotatorreader.New(binary.LittleEndian, bu)

	err := a.Marshal(&song, "song")
	if err != nil {
		log.Fatal(err)
	}

	var track [8]uint16

	err = a.Marshal(&track, "track data")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf(`%v`, a.Dump())

}

Into this:

Example screenshot

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type DebugInfoMap 

type DebugInfoMap map[Offset]DebugInformation

type DebugInformation 

type DebugInformation struct {
	Name     string         `json:"name"`
	Size     uint64         `json:"size"`
	Type     reflect.Type   `json:"type"`
	Value    *interface{}   `json:"value,omitempty"`
	KindTree []reflect.Kind `json:"kindtree"`
}

type Offset 

type Offset int64

type ReaderDumper 

type ReaderDumper struct {
	Endian binary.ByteOrder

	DebugInfo DebugInfoMap
	// contains filtered or unexported fields
}

func New 

func New(endiannessType binary.ByteOrder, rdr io.ReadSeeker) ReaderDumper

func (*ReaderDumper) Dump 

func (bd *ReaderDumper) Dump() string

Dump dumps readable hex dump where: -each variable boundary line has it's own color -ASCII, space, null etc characters have their own colors

func (*ReaderDumper) Marshal 

func (bd *ReaderDumper) Marshal(data interface{}, nameprefix string) (err error)

func (*ReaderDumper) Offset 

func (bd *ReaderDumper) Offset() (Offset, error)

Offset returns file's current offset

func (*ReaderDumper) Seek 

func (bd *ReaderDumper) Seek(offset Offset, whence int) (Offset, error)

Source Files

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