Wrong encoder for mixed type (with byte)

[kalloc]

Hi.

I save bytes to pdf417

hex_buf = '011b0000f829a358e1610100000001000000dfee82de5b9607c5186ce75de352648cfde9a15114305ebe39ed1db4940f3aa3cd89086ea5eb8db01fbe8255b0b0a5fbebca7a123859fc86f2ddfcb1abfd71e5' buf = bytes.fromhex(hex_buf) print(len(buf))

82

codes = encode(buf) img = render_image(codes) img.save('1.jpeg')

produced this image

When I check image on https://www.dynamsoft.com/Demo/DBR/BarcodeReaderDemo.aspx I got 011b0000f829a358e1610100000001005b9607c5186ce77de352648cfde9a15114305ebe39ed1db4940f3aa3cd89086ea5eb8db01fbe8255b0b0a5fbebca7a123859fc86f2ddfcb1abfd71e5

new_hex_buf = '011b0000f829a358e1610100000001005b9607c5186ce77de352648cfde9a15114305ebe39ed1db4940f3aa3cd89086ea5eb8db01fbe8255b0b0a5fbebca7a123859fc86f2ddfcb1abfd71e5' new_buf = bytes.fromhex(new_hex_buf) print(len(new_buf))

76

6 bytes missed :(

[ihabunek]

I will look into it, probably over the weekend.

[kalloc]

Did you have free time?

[ihabunek]

Sorry, I have been traveling and had other work. Before fixing, I'd like to find another another decoder to make sure the issue is with my encoding and not with their decoding. The one had time to try out (https://sourceforge.net/projects/pdf417decode/) did not work on my machine for some reason, would not recognize the barcode image format.

I'll try to find time to work on this soon, but can't promise you anything.

[ihabunek]

BTW, this reader gives a different decoding result, also different from input :/ https://online-barcode-reader.inliteresearch.com/

[ihabunek]

Not really. Working. See the issue.

-- Ivan

On Mon, 27 Feb 2017, at 14:57, kalloc wrote:

Did you have free time?

— You are receiving this because you commented. Reply to this email directly, view it on GitHub[1], or mute the thread[2].

Links:

1. https://github.com/ihabunek/pdf417-py/issues/6#issuecomment-282726574
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[kalloc]

I did use bcgen for generate image with test example from this ticket (82 bytes). Then I uploaded this image into dynamsoft decoder and got only 77 bytes instead of 82

[kalloc]

1) we need working generator 2) as I understand, dynamsoft decoder works well

[kalloc]

This file was successfully decoded in dynamsoft.com

[kalloc]

I found valid coder.

def encode(data: bytes)-> bytes:
        import zint
        from ctypes import create_string_buffer, memmove
        import PIL
        import io

        input = zint.instr(data)
        symbol = zint.ZBarcode_Create()
        symbol.contents.symbology = zint.BARCODE_PDF417
        symbol.contents.option_1 = 4
        symbol.contents.option_2 = 4
        zint.ZBarcode_Encode_and_Buffer(symbol, input, len(input) - 1, 0)
        BITMAP_SIZE = symbol.contents.bitmap_height * symbol.contents.bitmap_width * 3
        buf = create_string_buffer(BITMAP_SIZE)
        memmove(buf, symbol.contents.bitmap, BITMAP_SIZE)
        im = PIL.Image.frombytes('RGB', (symbol.contents.bitmap_width, symbol.contents.bitmap_height), bytes(buf))
        b = io.BytesIO()
        im.save(b, format='PNG')
        image = b.getvalue()
        zint.ZBarcode_Delete(symbol)
        return image