dankogai / js-deflate Goto Github PK

You should include the base64.js from your base64 repo in this repo, as it is referenced in the HTML test file.

Another js file is included which I couldn't find, but just removing the script tag fixed the problem.

Also, we tested with pretty large samples (compressing a 700K text file) and the keyup handling wasn't so nice (long delays, have to type an extra key after pasting the content). Explicit buttons for compress/decompress would be nice for testing with large datasets.

Great lib!

Hi,

It seems that you don't respect totally the RFC. For example if I deflate "octavian" using zlib (with DEFLATE_OPTION) I obtain the following bytes:

120 156 203 79 46 73 44 203 76 204 3 0 15 21 3 86

If I deflate the same string using your library I obtain the following bytes:
203 79 46 73 44 203 76 204 3 9 0

So, I can't deflate a string using your library and inflating using another software.

Using python:

import zlib
zlib.decompress("w7NIw43DicOJBwA=".decode("base64"))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
zlib.error: Error -3 while decompressing data: incorrect header check

using node.js:

> zlib.inflateSync(new Buffer("w7NIw43DicOJBwA=", "base64"))
Error: incorrect header check
...
> zlib.inflateRawSync(new Buffer("w7NIw43DicOJBwA=", "base64"))
Error: invalid distance too far back
...
> zlib.gunzipSync(new Buffer("w7NIw43DicOJBwA=", "base64"))
Error: incorrect header check
...

But I can get python's compressed blobs to be accepted by node's inflateSync. (And I have experience using python for png formatting, and node for zip file formatting.)

Is this project compliant with the DEFLATE spec?

Can you please license js-deflate with a BSD, MIT licence so everyone can use it. I would like to use it in a commercial product.

Thanks!

Gene Thomas.

An interesting usage for this library is sending compressed data from a javascript client to a Java-based server, decoding the data on the server. For example, compress some json parameters sent via an Ajax request.
To check this option, I created a deflated+base64 encoded string using this library, and tried inflating it using the Java package java.util.zip (Classes Deflater and Inflater). Unfortunately I bumped into problems due to incompatibility of javascript escape/unescape with Java.
Is there a compatible Java library that can work with this javascript implementation?
Regards

Tested below code. Input string is part of genjimonogatari(HTML, Shift JIS). Decoding is failed.
a=RawDeflate.deflate(String.fromCharCode.apply(0,[60,72,84,77,76,62,10,60,72,69,65,68,62,10,60,84,73,84,76,69,62,137,212,142,85,151,162,129,105,146,232,137,198,142,169,149,77,150,123,129,106,60,47,84,73,84,76,69,62,10,60,47,72,69,65,68,62,10,60,66,79,68,89,62,10,70,105,114,115,116,32,117,112,100,97,116,101,100,32,57,47,50,48,47,49,57,57,54,129,105,118,101,114,46,49,45,49,129,106,60,66,82,62,32,10,76,97,115,116,32,117,112,100,97,116,101,100,32,57,47,54,47,50,48,48,57,129,105,118,101,114,46,50,45,50,129,106,60,66,82,62,10,143,97,146,74,137,104,136,234,141,90,146,249,40,67,41,60,66,82,62,10,60,80,62,10,129,64,129,64,60,72,51,62,137,212,142,85,151,162,60,47,72,51,62,10,60,80,62,10,140,245,130,233,140,185,142,129,130,204,147,241,143,92,140,220,141,206,137,196,129,65,139,223,137,113,145,229,143,171,142,158,145,227,130,204,149,168,140,234,60,66,82,62,10,60,80,62,10,129,64,137,212,142,85,151,162,130,204,149,168,140,234,60,66,82,62,10,60,66,82,62,10,129,64,91,142,229,151,118,147,111,143,234,144,108,149,168,93,60,66,82,62,10,60,68,76,62,10,60,68,84,62,129,64,140,245,130,233,140,185,142,129,60,130,208,130,169,130,233,130,176,130,241,130,182,62,10,60,68,68,62,140,196,143,204,45,45,45,145,229,143,171,147,97,129,65,147,241,143,92,140,220,141,206,129,64,142,81,139,99,140,147,139,223,137,113,137,69,145,229,143,171,60,66,82,62,10,60,68,84,62,129,64,137,212,142,85,151,162,60,130,205,130,200,130,191,130,233,130,179,130,198,62,10,60,68,68,62,140,196,143,204,45,45,45,142,79,130,204,140,78,129,65,151,237,140,105,147,97,143,151,140,228,130,204,150,133,129,64,140,185,142,129,130,204,151,246,144,108,60,66,82,62,10,60,68,84,62,129,64,151,237,140,105,147,97,143,151,140,228,60,130,234,130,162,130,175,130,162,130,197,130,241,130,204,130,201,130,229,130,164,130,178,62,10,60,68,68,62,140,196,143,204,45,45,45,151,237,140,105,147,97,129,69,143,151,140,228,129,65,140,204,139,203,154,226,137,64,130,204,143,151,140,228,60,66,82,62,10,60,68,84,62,129,64,136,210,140,245,60,130,177,130,234,130,221,130,194,62,10,60,68,68,62,140,196,143,204,45,45,45,136,210,140,245,129,65,140,185,142,129,130,204,147,251,149,234,142,113,60,66,82,62,10,60,47,68,76,62,10,60,80,62,10,60,79,76,62,10,60,76,73,62,137,212,142,85,151,162,150,75,150,226,130,240,140,136,136,211,45,45,45,60,65,32,72,82,69,70,61,34,35,105,110,49,49,34,62,144,108,146,109,130,234,130,202,129,65,140,228,144,83,130,195,130,169,130,231,130,204,130,224,130,204,142,118,130,205,130,181,130,179,130,205,60,47,65,62,10,60,76,73,62,146,134,144,236,130,204,143,151,130,198,152,97,137,204,130,240,145,161,147,154,45,45,45,60,65,32,72,82,69,70,61,34,35,105,110,49,50,34,62,137,189,130,206,130,169,130,232,130,204,140,228,130,230,130,187,130,208,130,200,130,173,129,65,130,164,130,191,130,226,130,194,130,181,130,196,60,47,65,62,10,60,76,73,62,142,111,151,237,140,105,147,97,143,151,140,228,130,198,144,204,130,240,140,234,130,233,45,45,45,60,65,32,72,82,69,70,61,34,35,105,110,49,51,34,62,130,169,130,204,150,123,136,211,130,204,143,138,130,205,129,65,142,118,130,181,130,226,130,232,130,194,130,233,130,224,130,181,130,233,130,173,60,47,65,62,10,60,76,73,62,137,212,142,85,151,162,130,240,150,75,150,226,45,45,45,60,65,32,72,82,69,70,61,34,35,105,110,49,52,34,62,144,188,150,202,130,201,130,205,129,65,130,237,130,180,130,198,130,200,130,173,60,47,65,62,10,60,47,79,76,62,10,60,80,62,10,60,65,32,72,82,69,70,61,34,35,105,110,50,49,34,62,129,121,143,111,147,84,129,122,60,47,65,62,60,66,82,62,10,60,65,32,72,82,69,70,61,34,35,105,110,50,50,34,62,129,121,141,90,146,249,129,122,60,47,65,62,60,66,82,62,10,60,80,62,10,129,64,60,72,52,62,137,212,142,85,151,162,130,204,149,168,140,234,60,47,72,52,62,10,129,64,60,65,32,78,65,77,69,61,34,105,110,49,49,34,62,91,145,230,136,234,146,105,129,64,137,212,142,85,151,162,150,75,150,226,130,240,140,136,136,211,93,60,47,65,62,60,66,82,62,10,60,80,62,10,129,64,144,108,146,109,130,234,130,202,129,65,140,228,144,83,130,195,130,169,130,231,130,204,130,224,130,204,142,118,130,205,130,181,130,179,130,205,129,65,130,162,130,194,130,198,130,200,130,171,130,177,130,198,60,65,32,72,82,69,70,61,34,35,107,48,49,34,62,130,200,130,223,130,234,130,199,60,47,65,62,60,65,32,78,65,77,69,61,34,116,48,49,34,62,129,65,60,47,65,62,130,169,130,173,130,168,130,217,130,169,130,189,130,204,144,162,130,201,130,194,130,175,130,196,130,179,130,214,129,65,130,237,130,195,130,231,130,205,130,181,130,164,142,118,130,181,151,144,130,233,130,233,130,177,130,198,130,204,130,221,130,220,130,179,130,234,130,206,129,65,130,224,130,204,144,83,141,215,130,173,129,65,144,162,130,204,146,134,130,200,130,215,130,196,137,125,130,205,130,181,130,164,142,118,130,181,130,200,130,231,130,233,130,233,130,201,129,65,130,179,130,183,130,170,130,200,130,233,130,177,130,198,145,189,130,169,130,232,129,66,60,66,82,62,10,60,80,62,10,129,64,151,237,140,105,147,97,130,198,149,183,130,177,130,166,130,181,130,205,129,65,139,123,130,189,130,191,130,224,130,168,130,205,130,185,130,184,129,65,137,64,137,66,130,234,130,179,130,185,130,189,130,220,130,208,13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HI,
I deflated under string:

{"WorkID":"634828917904197752","StartTime":"2013-07-09 11:31:41","QuesList":[{"ID":"634898719662752272","Sorce":5,"Type":1,"Answers":[{"SID":1,"Ans":"609652639572752273"}]},{"ID":"634898719632602263","Sorce":5,"Type":1,"Answers":[{"SID":1,"Ans":"609652639572602264"}]},{"ID":"634898718910413816","Sorce":5,"Type":1,"Answers":[{"SID":1,"Ans":"609652638900413817"}]},{"ID":"634898718178469664","Sorce":5,"Type":1,"Answers":[{"SID":1,"Ans":"609652638128469665"}]},{"ID":"634898717935986938","Sorce":5,"Type":1,"Answers":[{"SID":1,"Ans":"609652637905986939"}]},{"ID":"634898716539937661","Sorce":5,"Type":1,"Answers":[{"SID":1,"Ans":"609652636519937662"}]},{"ID":"634898716503703300","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":"口服后房价"}]},{"ID":"634898715706999447","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":"飞"}]},{"ID":"634898713482038183","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":""}]},{"ID":"634898713210804385","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":"发的"}]},{"ID":"634898709742857746","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":"地方"}]},{"ID":"634898707056812397","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":"大幅度"}]},{"ID":"634898719933791778","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":"的风驰电掣"}]},{"ID":"634898718855018932","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":"发的"}]},{"ID":"634898718647055321","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":"发的发的"}]},{"ID":"634898717817067277","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":""}]},{"ID":"634898717392602999","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":""}]},{"ID":"634898717338278748","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":""}]},{"ID":"634898714329531233","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":""}]},{"ID":"634898713885983003","Sorce":5,"Type":3,"Answers":[{"SID":1,"Ans":""}]}]}

the result is:
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

But i can't inflate.

please tell me why and how to do,thank you.

I'm deflating following html using both System.IO.Compression.DeflateStream and Ionic.Zlib.DeflateStream:

<div id="feedHeaderContainer">
      <div id="feedHeader" dir="ltr" class="feedBackground">
        <div id="feedIntroText">
          <p id="feedSubscriptionInfo1"></p>
          <p id="feedSubscriptionInfo2"></p>
        </div>
        <div id="feedSubscribeLine"></div>
      </div>
    </div>

They both produce same base64 output:

s0nJLFPITLFVSktNTfFITUxJLXLOzytJzMxLLVKy4+VSAAMbTFVKCimZRbZKOSVAVnJOYnExRNIpMTk7vSi/NC8FoRtNv2deSVF+SGpFCbIKoJoCuIrg0qTi5KLMgpLM/DzPvLR8QyU7G/0CYlUboau20Qdaj8s1UN1JqT5AL4N0IqtF5kHYAA==

Decompression in C# works just fine, but using RawDeflate.inflate produces following result:

<div id="feedHeaderContainer">
      <div id="feedHeader" dir="ltr" class="feedBackground">
        <div id="feedIntroText">
          <p id="feedSbscrpass="feedBackground">
        <div id="feedIóbscrpass="feedBackground">
        <div id="feedIóbscrpass="feedBackground">
        <div id="feedIóbscrpass="feedBackground">
        <div id="feedIóbscrpass="feedBackground">
        <div id="feedIóbscrpaöscrpaöscrpaösc��NP]%�Ç��"feedBackground">
        <div id="feedIóbscrpass="feedBackground">
        <dieLedIdiv pass="feedBav pass="feedv pass

When i compress complete html document it returns empty string.

This is my code:

var com = 's0nJLFPITLFVSktNTfFITUxJLXLOzytJzMxLLVKy4+VSAAMbTFVKCimZRbZKOSVAVnJOYnExRNIpMTk7vSi/NC8FoRtNv2deSVF+SGpFCbIKoJoCuIrg0qTi5KLMgpLM/DzPvLR8QyU7G/0CYlUboau20Qdaj8s1UN1JqT5AL4N0IqtF5kHYAA==';

unc = Base64.btou(RawDeflate.inflate(Base64.fromBase64(com)));
alert(unc);

I would like to use js-deflate in a project of mine, but unfortunately there is no license specified.

I tried import function or const from rawinflate.js but failed.

const RawDeflate = '../../js/compress/rawinflate'
import {zip_inflate} from '../../js/compress/rawdeflate'
// decompress from RFC1951 defalted
let plain = RawDeflate.inflate(compressed)

but it does not work. can you please show me the way?
thanks

I need DEFLATE support with a level 0 compression, having trouble with implementation though.

Looks like zip_deflate_internal checks for zip_match_available which is never initialized in case of (zip_compr_level <= 3).
This leads to additional bytes added to compressed data in case of deflate_fast. Some picky decompressors complain about it: optipng or firefox for example.

I fixed it this way:

--- rawdeflate.js.orig  2011-09-09 19:28:45.000000000 +0200
+++ rawdeflate.js       2011-09-09 19:25:14.000000000 +0200
@@ -753,6 +753,7 @@
     zip_qhead = null;
     zip_outcnt = 0;
     zip_outoff = 0;
+    zip_match_available = 0;
 
     if(zip_compr_level <= 3)
     {
@@ -762,7 +763,6 @@
     else
     {
        zip_match_length = zip_MIN_MATCH - 1;
-       zip_match_available = 0;
     }
 
     zip_complete = false;

have you any idea how to decompress using php? is this standard protocol DEFLATE? i tried with http://php.net/manual/en/function.gzinflate.php but it doesnt work.

I can't find any license information, just a reference to an "original" version that also appears to also not have any explicit license (though, I do not read Japanese).

I'd really like to use this in a project, but I can't without clearer licensing.

经过测试发现使用C#压缩的文本内容无法用其解压，这是为什么呢

i tried to use zlib to inflate but failed

how to inflate this with python? thanks!