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PINCH Some crazy HTTP ZIP Magic

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@peterhellberg

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I’m a Senior Systems Architect at Athega (where I build stuff in Ruby) ⃔ I’m also the owner o Code7 Interactive (where I build stuff in Ruby) ⃕

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Retrieve a ile rom inside a ZIP ile, over the network! Pretty sweet, eh?

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require 'pinch' url = 'http://peterhellberg.github.com/pinch/test.zip' data = Pinch.get(url, 'data.json') # Do something with the data How?

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Now, let’s go back in⏰

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’89 APPNOTE.TXT http://PKWARE.com/documents/casestudies/APPNOTE.TXT

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FILE ENTRY 1 FILE ENTRY 2 CENTRAL DIRECTORY END OF CENTRAL DIRECTORY Signature 0x06054b50 ZIP File Format

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Pinch does NOT understand the ZIP File Format

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HTTP/1.1 14.16 Content-Range ❤ || ☠

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1 HEAD Total ile size 2 GET Last 4096 bytes (End of Central Directory) 3 GET Central Directory start → Central Directory start + size 4 GET File offset → File offset + (compressed) size HTTP Requests

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String#unpack Zlib::In late Array#pack

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gem install pinch

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github.com/peterhellberg/pinch

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@peterhellberg peterhellberg.info git.io/peterhellberg