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Add support for reassembling GOG Galaxy file parts #58

JayAndCatchFire opened this issue Apr 9, 2018 · 3 comments

Add support for reassembling GOG Galaxy file parts #58

JayAndCatchFire opened this issue Apr 9, 2018 · 3 comments


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@JayAndCatchFire JayAndCatchFire commented Apr 9, 2018

When I try to extract the files from GOG's "Unreal 2 - The Awakening Special Edition" installer, there are no errors or anything like that. However, the app directory is mostly empty. There's a commonappdata folder that I don't recall having seen with any of the other GOG installers. And most of the data is in the tmp directory, but broken up into very small pieces that appear to be parts of larger files that are addressed by hashes.

Here's a link to my output from just listing the contents of the installer. I would include it here, but it's too long for the body of a GitHub issue.

It's very bizarre and completely unusable. Any ideas as to what may be going on here?

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@vv221 vv221 commented Apr 9, 2018

This is a known issue due to a change in the way GOG packages their Windows games, you can read more about it on the GOG forums:

An innoextract fork allow to extract these installers:

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@JayAndCatchFire JayAndCatchFire commented Apr 13, 2018

Good to know. Thank you.

@dscharrer dscharrer reopened this Jun 3, 2018
dscharrer added a commit that referenced this issue Jun 5, 2018
@dscharrer dscharrer changed the title Unexpected results trying to extract GOG's "Unreal 2 - The Awakening Special Edition" with 1.6 Add support for reassembling GOG Galaxy file parts Jun 9, 2018
@dscharrer dscharrer added this to the 1.7 milestone Jun 9, 2018
dscharrer added a commit that referenced this issue Jun 9, 2018
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@dscharrer dscharrer commented Jun 9, 2018

Support for GOG Galaxy files has been added to innoextract 1.7 (to be released soon), a release candidate is available for testing.

Current limitations:

  • Architecture and OS constraints are ignored (language constraints are supported and there is a warning for non-default architecture and OS constraints) - are these used anywhere?
  • All parts of the same file must have the same constraints (there is a warning for this also the first part contains a checksum for the whole file so this is likely OK)

Current advantages over gogextract:

  • GOG Galaxy files are handled without the --gog option for installers published by (the --gog option still forces it for all installers)
  • Dependencies (ie before_install_dependency/after_install_dependency) are also extracted
  • Collisions (overwriting/renaming) works correctly for multi-part files
  • GOG Galaxy language constraints are handled via the --languageand --language-only options just like normal Inno Setup language constraints
  • --list-languages lists languages used in GOG Galaxy constraints
  • The re-assembled file is validated against the file checksum
  • The output file is opened only once for multi-part files
@dscharrer dscharrer closed this Jun 9, 2018
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