Should it be merged, the library will have binary decoder option that will instruct decoders to return the raw binary data without converting it. As you noted, I brought this up in issue #55 and after some time managed to submit a pull request to improve this. This will most likely mangle the binary data. If a character set isn't specified, it will attempt to guess the encoding and convert the data to it. The retrieval of the raw binary data is a detail at best.Ĭurrent versions of the zbar library will treat byte mode QR codes as if they were unknown ECI mode QR codes. The problem is most decoders were explicitly designed to handle textual data first and foremost.
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The qrencode tool is doing its job correctly: it is creating a byte mode QR code with the data you gave it as its contents. For example, when a decoder encounters an ECI 26 mode QR code it knows to decode the binary data as UTF-8. Here's a list of known ECI values and the character encodings they represent. The ECI mode is like 8 bit mode but with additional metadata that tells the decoder which character set to use in order to decode the binary data back to text. The byte encoding allows storing arbitrary 8 bit data in the QR code. The simplest, most commonly used and widely supported is the alphanumeric encoding which is suitable for simple text. ZBar version 0.23.1 and newer will be able to decode binary QR codes: zbarimg -raw -oneshot -Sbinary qr.png
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De-accepting the answer by as I would like to have it 'full binary', sorry.Įdit 3: as of it looks like this is a well-known issue of zbarimg and that a pull request to fix this is on its way:Įdit 4: if you know of another command-line tool on linux that is able to decrypt qr-codes with binary content, please feel free to let me know. The reason why I use binary in the first place is to be size-efficient so I would like to avoid that. Įdit 2: using base64 encoding doubles the size of the message. It looks like I am not very far, but something is still off.Įdit 1: a possible fix is to use base64 wrapping, as explained in the answer by. After a bit of troubleshooting, I still do not manage to decode what I had encodedĪny idea why? Currently the closest I am to a solution is: $ dd if=/dev/urandom bs=10 count=1 status=none > data.binĠ0000000: b255 f625 1cf7 a051 3d07. After a search, it looks like I should use qrencode for encoding, and zbarimg for decoding. I have some binary data that I want to encode in a qr-code and then be able to decode, all of that in bash.
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