Undocumented windowsBits feature of Zlib::Infrate/Deflate
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Key: JRUBY-6017
URL: https://jira.codehaus.org/browse/JRUBY-6017
Project: JRuby
Issue Type: Task
Components: Extensions
Affects Versions: JRuby 1.6.4
Environment: any
Reporter: Hiroshi Nakamura
Assignee: Hiroshi Nakamura
Zlib::Inflate accepts MAX_WBITS + 16 (means gzip inflation) and MAX_WBITS + 32
(automatic detection of zip/gzip) as a windowBits value. And Zlib::Deflate
accepts MAX_WBITS + 16 (means gzip deflation).
These features are from zlib 1.2.1. CRuby just passes windowBits value to zlib
(inflateInit2 and deflateInit2) so it supports the extra features when
underlying zlib supports it. You cannot use these features when you compile
CRuby with zlib 1.1.X.
I heard that Rack started using this feature. JRuby should also support it even
though those features are undocumented at CRuby level.
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