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I would like to know if its possible to read binary data from a blobstore and convert it into the desired file type. eg.

I receive binary data representing these files 

example.txt
example.jpg
example.pdf

Would I have to parse the files names from the string name and to get the file type, then use those types to encode the binary back to the desired file type?

getting_there
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  • What exactly do you want as your output? – Nulano Mar 05 '17 at 17:06
  • In theory it's possible. I don't know of any library which does this though. – Peter Lawrey Mar 05 '17 at 17:07
  • @Nulano I would want the correctly encoded files as the output? Not just an array of byte data – getting_there Mar 06 '17 at 14:19
  • Binary files (such as pdf, zip, jpg) are encoded as an array of bytes. Just write them to the disk with a `FileOutputStream`. Text files are usually encoded with the system-default encoding. You can try `new String(data)`, or wrap your `InputStream` (or `ByteArrayInputStream`) into a `Reader`. (or you can just write the data as bytes and let the system handle it) – Nulano Mar 06 '17 at 14:46

1 Answers1

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You just need to save the data exactly as you got it using the name. No conversion needed.

john16384
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  • What do you mean by this? Its an array of byte data. – getting_there Mar 06 '17 at 14:17
  • The files are already in the correct format (the byte array contains bytes representing the JPG format or TXT format). Just because you stored a JPG does not mean that somekind of conversion is happening, it just stored the bytes. Reading them again is therefore just a matter of writing those bytes back to a file. – john16384 Mar 06 '17 at 14:20
  • Ok, that makes sense now that I think about it., Thanks – getting_there Mar 06 '17 at 14:29