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zlib unpacking yields in assertion error #1882

andris9 opened this Issue Oct 13, 2011 · 3 comments


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andris9 commented Oct 13, 2011

Node.js: v0.5.9, v0.5.8
Systems: OSX, Debian Lenny

When trying to unpack (gunzip or inflte) data with zlib, assertion error occurs.

Using he following script (slightly modified from the zlib section in node.js manual, createGzip changed to createGunzip) and the output length (unpacked.txt) should be 32kB or larger:

var zlib = require('zlib');
var gzip = zlib.createGunzip();
var fs = require('fs');
var inp = fs.createReadStream('packed.gz');
var out = fs.createWriteStream('unpacked.txt');


The following error occurs:

node: ../src/node_zlib.cc:104: static v8::Handle<v8::Value> 
    node::ZCtx<mode>::Write(const v8::Arguments&) [with 
    node::node_zlib_mode mode = INFLATERAW]: 
    Assertion `in_off + in_len <= Buffer::Length(in_buf)' failed.

isaacs commented Oct 13, 2011

I can reproduce. Investigating.

@ghost ghost assigned isaacs Oct 13, 2011

@isaacs isaacs closed this in 59a5262 Oct 13, 2011

andris9 commented Oct 14, 2011

wow, that was fast, thanks!

isaacs commented Oct 14, 2011

Failing assert + reproducible test = easy fix :)

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