Model files are modified (PNGs are corrupt) after extraction from downloaded zip file (Windows, conda, gz-fuel-tools10-10.0.1)

[torsten-pf]

Environment

• OS Version: Windows 10
• Binary build, installed via conda install gz-sim9
• Version: 10.0.1 (libgz-fuel-tools10-10.0.1-h4fb69ce_0)

Description

• Expected: Downloaded zipped model files are extracted without file modifications
• Actual behavior: extracted files are modified (added whitespace characters). While this is not a problem for text files, the PNG files are corrupted and not loaded.

Steps to reproduce

1. Install gz-sim9 in a new conda environment conda install gz-sim9
2. Open shell, activate environment and run gz sim -s <model>.sdf - I used auv_controls.sdf
3. Files are downloaded and extracted to %USERPROFILE%\.gz\fuel\fuel.gazebosim.org, for auv_controls.sdf to %USERPROFILE%\.gz\fuel\fuel.gazebosim.org\accurrent\models\mbari%20tethys%20lrauv\3
4. Download the zip file from the url presented in the gz log file
5. Compare the text and PNG files

Output

Diff of model.sdf, left is the file manually extracted from the zip, right the file extracted by gz-fuel-tools:

Same files in ImHex hex viewer / editor:

Same for Tethsys_Albedo.png (left manually extracted from zip, right from gz-fuel-tools):

Extract from server_console.log:

(2025-02-21 15:25:55.287) [info] [FuelClient.cc:682] Downloading model [fuel.gazebosim.org/accurrent/models/mbari%20tethys%20lrauv]
(2025-02-21 15:25:55.891) [debug] [FuelClient.cc:1968] Downloading from a referral link [https://gz-fuel-resources-production.s3.amazonaws.com/accurrent/7c38bd52-7337-4bb9-ac94-421814f7ccfb/.zips/3.zip?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAS5OHIRKDBY6VUUFF%2F20250221%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20250221T142555Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=d87ca543831c2239e752cd5bca5096bdf78edf062e1548d22e95a3c75c481edc]
(2025-02-21 15:25:57.627) [debug] [Zip.cc:180] Created file [<USERPROFILE>\.gz\fuel\fuel.gazebosim.org\accurrent\models\mbari%20tethys%20lrauv\3\materials\scripts\model.material]
(2025-02-21 15:25:57.647) [debug] [Zip.cc:180] Created file [<USERPROFILE>\.gz\fuel\fuel.gazebosim.org\accurrent\models\mbari%20tethys%20lrauv\3\materials\textures\Tethys_Albedo.png]