fix: properly parse PNG iTXt chunks per specification (#8530)

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## Summary
Fixes PNG iTXt chunk parsing to comply with the PNG specification.

## Problem
The current iTXt parser incorrectly reads the text content immediately
after the keyword null terminator, but iTXt chunks have additional
fields:
- Compression flag (1 byte)
- Compression method (1 byte)
- Language tag (null-terminated)
- Translated keyword (null-terminated)
- Text content

This caused PNGs that correctly follow the spec to fail loading with
JSON parse errors due to leading null bytes.

## Solution
Skip the compression flag, method, language tag, and translated keyword
fields before reading the text content.

Fixes #8150

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8530-fix-properly-parse-PNG-iTXt-chunks-per-specification-2fa6d73d36508189bef4cc5fa3899096)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: github-actions <github-actions@github.com>

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This commit is contained in:

Christian Byrne

2026-02-02 17:12:11 -08:00

committed by GitHub

parent 7928e8797d

commit 139ee32d78

5 changed files with 344 additions and 21 deletions

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