Re: Digest::MD5 addfile() w/ tied filehandle

Digging into this further, I found that Digest::SHA actually uses straight Perl to do the reading. When tried when Digest::SHA1, which uses PerlIO_read in XS like Digest::MD5, it fails. Perhaps the original question should have been: Can I use tied filehandles with XS modules that use PerlIO_read, and if so, how?

I found this post: http://stackoverflow.com/questions/13624061/how-do-i-use-tied-filehandles-from-perl-xs-code in which it seems they had to modify the XS. Am I out of luck here? Should I just put a warning in the POD about using it with XS-based modules? Or is there another way to do what I want (a class that can act like a filehandle) without using tied filehandles and which would be compatible with PerlIO_read?

Comment on Re: Digest::MD5 addfile() w/ tied filehandle

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Re^2: Digest::MD5 addfile() w/ tied filehandle by BrowserUk (Patriarch) on Sep 01, 2015 at 18:28 UTC
Two thoughts: Have you ensured that the filehandle has been binmoded? Produce a very minimal demonstration of the problem and raise a perlbug. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". I knew I was on the right track :) In the absence of evidence, opinion is indistinguishable from prejudice. I'm with torvalds on this Agile (and TDD) debunked I told'em LLVM was the way to go. But did they listen!	[reply]
Re^3: Digest::MD5 addfile() w/ tied filehandle by jdv (Sexton) on Sep 01, 2015 at 19:07 UTC
1. The actual filehandle to the compressed file my class reads is opened ':raw', yes. I'm not sure where else it would make sense to do this. If I try to binmode the tied filehandle, it just tries to find a BINMODE method in my class, which I would have to define myself (probably as setting the mode of the compressed filehandle as I've already done). 2. I'll try to generate a minimal tied class that demonstrates what I observe. If I see the same thing, does this seem like a bug or a feature request? Would they both go to the same place?	[reply]
Re^4: Digest::MD5 addfile() w/ tied filehandle by BrowserUk (Patriarch) on Sep 01, 2015 at 19:46 UTC
If I see the same thing, does this seem like a bug or a feature request? Would they both go to the same place? My best guess based upon what I've read in this thread, is that you've encountered a bug in the PERL_IO implementation; and that it is a bug against Perl itself; thus should be aimed at p5p. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". I knew I was on the right track :) In the absence of evidence, opinion is indistinguishable from prejudice. I'm with torvalds on this Agile (and TDD) debunked I told'em LLVM was the way to go. But did they listen!	[reply]