haskell - How to output minimal binary using Data.Binary and Data.ByteString.Lazy? -


minimal test code (bs.hs):

import qualified data.binary b import qualified data.bytestring.lazy.char8 bslc  main =     bslc.putstr $ b.encode $ pad $ bslc.pack "xxx"  data pad = pad bslc.bytestring instance b.binary pad     put (pad p) =         b.put p     =         p <- b.get         return $ pad p

and get:

% runghc bs.hs | od -c 0000000   \0  \0  \0  \0  \0  \0  \0 003   x   x   x                     0000013 % ghc --version glorious glasgow haskell compilation system, version 7.10.2

i expect "xxx". have no idea how first 8 bytes (7 x \0 + 1 x 003) come from.

from comment, explanation of output format binary uses serializing bytestrings output length 64-bit integer followed contents of bytestring.

generally, though, binary class of limited use. there's no guarantee of forward or backward compatibility, no mechanism allow schema evolution, no standard or specification instances allow cross-language interoperability. it's useful if want opaque binary blob store temporarily and/or communicate nodes have high level of control over. consumer, can expect of binary instance. while there no reason not make binary instance type create serialization code, if offer guarantees beyond above should (also) present separately binary class. ideally, instance of class communicates guarantees, e.g. class serializing specific format such avro.

all directed @ binary class. rest of binary package quite useful intended purpose.


Comments

Post a Comment

Popular posts from this blog

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in...
Read more

caching - How to check if a url path exists in the service worker cache -

i need check if particular url path exists in service worker cache. example, suppose url is: /myserviceworker/service?a=110&b=70 this url exists in cache, there many of them different values of , b. now, suppose want refresh of these urls, how can that? i want know how access key values service worker cache. if know key, plan follows: var url = new url(key); if(url.pathname === "\/myserviceworker/service") refetch key but not sure how cache key , in format is. mean, string or url? cache api has match() method returns promise resolving in response object if match or undefined if no match exists. second parameter object can specify ignoresearch not take account url parameters. the ignoresearch option supported firefox ( chrome status here ). in other hand, retrieve cache entries, can use keys() method.
Read more

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^...
Read more