Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!xlned.com!feeder7.xlned.com!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!194.109.133.84.MISMATCH!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'subject:Does': 0.04; 'data:': 0.09; 'naturally': 0.09; 'none:': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:80.91.229.12': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'received:lo.gmane.org': 0.09; 'output': 0.11; 'binary': 0.13; 'subject:file': 0.13; 'wrote:': 0.15; "'r')": 0.16; 'arguments:': 0.16; 'hex': 0.16; 'mode.': 0.16; 'received:dip.t-dialin.net': 0.16; 'received:t-dialin.net': 0.16; 'dance': 0.16; 'def': 0.16; 'digest': 0.19; 'file,': 0.22; 'function': 0.26; 'problem': 0.29; 'example': 0.30; 'match': 0.30; 'but...': 0.30; 'from:addr:web.de': 0.30; 'subject:support': 0.30; 'version': 0.30; 'subject:?': 0.31; 'usual': 0.32; 'break': 0.33; 'to:addr :python-list': 0.34; 'header:X-Complaints-To:1': 0.34; 'skip:o 20': 0.36; 'file': 0.36; 'open': 0.37; 'but': 0.37; 'received:org': 0.38; 'subject:: ': 0.38; 'two': 0.38; 'header :Mime-Version:1': 0.39; 'data': 0.39; 'version:': 0.39; 'to:addr:python.org': 0.39; 'did': 0.40; 'flow': 0.68; 'stream': 0.77; 'died.': 0.84; 'streams': 0.84; 'subject:mode': 0.84; 'ipad': 0.93; 'yours.': 0.96 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Peter Otten <__peter__@web.de> Subject: Re: Does hashlib support a file mode? Date: Wed, 06 Jul 2011 18:26:09 +0200 Organization: None References: <453cc47b-b545-4bcf-91c0-2efe2aae37bd@v11g2000prn.googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Gmane-NNTP-Posting-Host: p5084b154.dip.t-dialin.net X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 50 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1309969573 news.xs4all.nl 21780 [2001:888:2000:d::a6]:56028 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:8951 Phlip wrote: > Tx, all!. But... > >> For example I use this function to copy a stream and return a SHA512 and >> the output streams size: >> >> def write(self, in_handle, out_handle): >> m = hashlib.sha512() >> data = in_handle.read(4096) >> while True: >> if not data: >> break >> m.update(data) >> out_handle.write(data) >> data = in_handle.read(4096) >> out_handle.flush() >> return (m.hexdigest(), in_handle.tell()) > > The operation was a success but the patient died. > > My version of that did not return the same hex digest as the md5sum > version: > > > def file_to_hash(path, m = hashlib.md5()): > > with open(path, 'r') as f: > > s = f.read(8192) > > while s: > m.update(s) > s = f.read(8192) > > return m.hexdigest() > > You'll notice it has the same control flow as yours. > > That number must eventually match an iPad's internal MD5 opinion of > that file, after it copies up, so I naturally cannot continue working > this problem until we see which of the two numbers the iPad likes! - Open the file in binary mode. - Do the usual dance for default arguments: def file_to_hash(path, m=None): if m is None: m = hashlib.md5()