jimp-dev/jimp

zlib error when trying to write many things in an async function

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#929 opened on Aug 22, 2020

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 (2 comments) (2 reactions) (0 assignees)JavaScript (13,218 stars) (785 forks)batch import
bughelp wanted

Description

Code:

https://pastebin.com/RZjLU1WA

Error:

{ Error: unexpected end of file at Zlib.zlibOnError [as onerror] (zlib.js:164:17) at Inflate._processChunk (/home/branch/node_modules/pngjs/lib/sync-inflate.js:110:28) at zlibBufferSync (/home/branch/node_modules/pngjs/lib/sync-inflate.js:151:17) at inflateSync (/home/branch/node_modules/pngjs/lib/sync-inflate.js:155:10) at module.exports (/home/branch/node_modules/pngjs/lib/parser-sync.js:85:20) at Object.exports.read [as image/png] (/home/branch/node_modules/pngjs/lib/png-sync.js:10:10) at Jimp.parseBitmap (/home/branch/node_modules/@jimp/core/dist/utils/image-bitmap.js:196:53) at Jimp.parseBitmap (/home/branch/node_modules/@jimp/core/dist/index.js:431:32) at /home/branch/node_modules/@jimp/core/dist/index.js:373:15 at FSReqWrap.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:53:3) errno: -5, code: 'Z_BUF_ERROR', methodName: 'constructor' }

Contributor guide

Tech stack
javascriptnodejs
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
JavaScriptNode.jsasync/await
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the zlib error by creating a minimal reproduction with many async image writes. Focus on the call stack in pngjs's sync inflate.js and parser sync.js. Determine if the error is due to concurrent writes or incomplete data. Check if the issue is related to the async nature of the code in the pastebin.