The gozbar from mordfustang21

gozbar's Introduction

GoZBar

Fork of https://github.com/PeterCxy/gozbar due to API breaking changes.

ZBar bindings for golang. Only scanner supported.

Read the ZBar documentations for explanations on constants and arguments.

The ZBar library must be installed for this to compile.

Example JPEG Scan.

func TestPhoto(t *testing.T) {
	const expectedStr = "http://www.searchenginestrategies.com/sanfrancisco/share.html"

	f, err := os.Open("./testdata/photo.jpg")
	if err != nil {
		t.Fatal(err)
	}

	i, err := jpeg.Decode(f)
	if err != nil {
		t.Fatal(err)
	}

	img := FromImage(i)

	s := NewScanner()
	err = s.SetConfig(0, CFG_ENABLE, 1)
	if err != nil {
		t.Fatal("error setting config", err)
	}

	err = s.Scan(img)
	if err != nil {
		t.Fatal("error scanning", err)
	}

	defer s.Destroy()

	img.First().Each(func(str string) {
		if str != expectedStr {
			t.Fatalf("expected [%s] got [%s]", expectedStr, str)
		}
	})
}

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gozbar's Issues

[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x50631bb]

Hi @MordFustang21 I'm developing a qrcode detect api, when I do stress test, some time the it will panic at two line
one is panic at s := C.zbar_image_first_symbol(i.image),
the other one is at below

func (s *Symbol) Each(f func(string)) {
	t := s
       // some time t is nil
	for {
		f(t.Data())

		t = t.Next()

		if t == nil {
			break
		}
	}
}

here is my test code

package main

import (
	"bytes"
	"fmt"
	"github.com/MordFustang21/gozbar"
	"image"
	_ "image/gif"
	_ "image/jpeg"
	_ "image/png"
	"io/ioutil"
	"sync"
)

func main() {
	var wg sync.WaitGroup
	wg.Add(2000)
	for i :=0; i < 2000; i++ {
		go func() {
			defer wg.Done()
			b, err := ioutil.ReadFile("img.png")
			if err != nil {
				panic(err)
			}
			img, _, err := image.Decode(bytes.NewReader(b))
			if err != nil {
				panic(err)
			}

			barcodeImg := gozbar.FromImage(img)
			scanner := gozbar.NewScanner()
			scanner.SetConfig(gozbar.NONE, gozbar.CFG_ENABLE, 1)

			err = scanner.Scan(barcodeImg)
			if err != nil {
				panic(err)
			}

			defer scanner.Destroy()
	
			barcodeImg.First().Each(func(str string) {
				fmt.Println(str)
			})

		}()
	}
	wg.Wait()

}