Commits on Feb 21, 2022

1. archive/zip: don't read data descriptor early …

   Go 1.17 introduced an unnecessary change to when a zip's data descriptor
   is read for file entries, how it is parsed and how the crc32 field is
   used.
   
   Before Go 1.17, the data descriptor was read immediately after a file
   entry's content. This continuous read is a pattern existing applications
   have come to rely upon (for example, where reads at specific offsets
   might be translated to HTTP range requests).
   
   In Go 1.17, all data descriptors are immediately read upon opening the
   file. This results in scattered and non-continuous reads of the archive,
   and depending on the underlying reader, might have severe performance
   implications. In addition, an additional object is now initialized for
   each entry, but is mostly redundant.
   
   Previously, the crc32 field in the data descriptor would return an error
   if it did not match the central directory's entry. This check has
   seemingly been unintentionally removed. If the central directory crc32
   is invalid and a data descriptor is present, no error is returned.
   
   This change reverts to the previous handling of data descriptors, before
   CL 312310.
   
   Fixes #48374
   Fixes #49089
   
   Change-Id: I5df2878c4fcc9e500064e7175f3ab9727c82f100
   Reviewed-on: https://go-review.googlesource.com/c/go/+/357489
   Run-TryBot: Ian Lance Taylor <[email protected]>
   Reviewed-by: Ian Lance Taylor <[email protected]>
   Trust: Dmitri Shuralyov <[email protected]>

   

   saracen committed Feb 21, 2022
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