<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On 29 Jan 2009, at 16:10, <a href="mailto:beginners-request@haskell.org">beginners-request@haskell.org</a> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; ">Content-Type: text/plain; charset="iso-8859-1"<br><br>I didn't compile, but, by the looks of it, I would change<br><br>import qualified Data.ByteString as BS (readFile)<br><br>for<br><br>import qualified Data.ByteString.Lazy as BS (readFile)<br><br><br>as it seems sha1 needs a lazy bytestring</span></blockquote><br></div><div><br></div><div><br></div><div>Thanks ! </div><div>It compiles now but brings me to my real problem :)</div><div>If I uncomment this line</div><div><br></div><div>"md5" -> md5sum</div><div><br></div><div>I get the following :</div><div><br></div><div>------</div><div><br></div><div><div>module Main where</div><div><br></div><div>import System.Environment (getArgs)</div><div>import Data.Digest.OpenSSL.MD5 (md5sum)</div><div>import Data.Digest.Pure.SHA (sha1, showDigest)</div><div>import qualified Data.ByteString.Lazy as BS (readFile)</div><div><br></div><div>-- sha1 :: ByteString -> Digest</div><div>-- readFile :: FilePath -> IO ByteString</div><div>-- md5sum :: ByteString -> String</div><div>-- showDigest :: Digest -> String</div><div><br></div><div>checkHash :: String -> String -> String -> IO ()</div><div>checkHash codec hash file = </div><div> let f = case codec of </div><div> "md5" -> md5sum </div><div> "sha1" -> showDigest . sha1</div><div> _ -> error "Codec must be md5 or sha1 !" in</div><div> BS.readFile file >>= \fileBS -></div><div> let fileHash = f fileBS in</div><div> print (hash == fileHash)</div><div> </div><div>main = </div><div> getArgs >>= \as -></div><div> case as of </div><div> (codec:hash:file:_) -> checkHash codec hash file</div><div> _ -> usage</div><div><br></div><div>usage = print "checksum codec hash file"</div><div><br></div><div>------</div><div><br></div><div>which now fails to compile with this error :</div><div><br></div><div><div>checksum.hs:17:22:</div><div> Couldn't match expected type `Data.ByteString.Internal.ByteString'</div><div> against inferred type `Data.ByteString.Lazy.Internal.ByteString'</div><div> In the expression: showDigest . sha1</div><div> In a case alternative: "sha1" -> showDigest . sha1</div><div> In the expression:</div><div> case codec of {</div><div> "md5" -> md5sum</div><div> "sha1" -> showDigest . sha1</div><div> _ -> error "Codec must be md5 or sha1 !" }</div><div><br></div><div><br></div><div>How can I both use md5sum and sha1 when one use a lazy ByteString end the other one does not ?</div><div><br></div><div>Thanks</div><div><br></div><div>E</div><div><br></div><div><br></div><div><br></div></div><div><br></div></div><br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>--</div><div>Emmanuel Delaborde</div><div>Web Technologist</div><div>Cimex<br>53-55 Scrutton Street, London UK, EC2A 4PJ<br>T: +44 (0)20 7324 7780<br>F: +44 (0)20 7324 7781<br><a href="http://www.cimex.com/">http://www.cimex.com</a></div></div></span></div></span> </div><br></body></html>
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