On Thu, Dec 6, 2012 at 9:58 AM, Vinay Sajip <vinay_sa...@yahoo.co.uk> wrote:
> Daniel Holth <dholth <at> gmail.com> writes: > > > The wheel implementation makes sure all the metadata (the .dist-info > directory) > > is at the end of the .zip archive. It's possible to read the metadata > with a > > single HTTP partial request for the end of the archive without > downloading the > > entire archive. > > Sounds good, but can you point to any example code which does this? As I > understand it, for .zip files you have to read the last part of the file > to get a > pointer to the directory, then read that to find where each file in the > archive > is, then seek to a specific position to read the file contents. You have to make a maximum of 3 requests: one for the directory pointer, one for the directory, and one for the file you want. It's not particularly difficult to make an HTTP-backed seekable file object to pass to ZipFile() for this purpose but I don't have an example. Normally the last few k of the file will contain all 3 pieces. 8k or 16k would be a good guess.
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