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README.md
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README.md

ASTAP command-line solver

Yacana solves images with ASTAP by Han Kleijn, run on the phone as a separate process. ASTAP is licensed under the Mozilla Public License 2.0, like Yacana. Its source code is at sourceforge.net/projects/astap-program and github.com/han-k59/astap.

The binaries

File ABI SHA-256
android/arm64-v8a/libastap_cli.so Phones (aarch64) a67eec027a09ddacad18a09de54dc7769b3bbd48cadbc573cb243b5b3acb0cdf
android/x86_64/libastap_cli.so Emulator: the same aarch64 build a67eec027a09ddacad18a09de54dc7769b3bbd48cadbc573cb243b5b3acb0cdf
  • Source: the official Android build astap_command-line_version_Android_aarch64.zip, from the project's android folder on SourceForge (published 2026-09-19).
  • Version: the program reports CLI-2026.09.01.
  • Changes: none. The astap_cli executable is renamed to libastap_cli.so, as its author recommends. Android then installs it with the native libraries, the only place from which an app may run a program.
  • 16 KB pages: the build already has 16 KB aligned segments, which tools/check_16kb.py checks in CI. It is used as published. Building from source is only needed for F-Droid.
  • Emulator:
    • The official x86_64 build has text relocations (DT_TEXTREL), and Android refuses to run it from an app ("CANNOT LINK EXECUTABLE … has text relocations").
    • The x86_64 emulator images of Android 11 and later run aarch64 programs through their ARM translation (libndk_translation). So the x86_64 folder carries the aarch64 build.
    • This only matters for development: phones are arm64.

The app module adds this folder to its native libraries and extracts them at install time (useLegacyPackaging). It runs the solver from applicationInfo.nativeLibraryDir.

Updating

  1. Download the new astap_command-line_version_Android_aarch64.zip from the android folder of the project on SourceForge.
  2. Copy its astap_cli over both libastap_cli.so files.
  3. Run python3 tools/check_16kb.py solvers/astap/android.
  4. Update the version and the SHA-256 values above.
  5. Solve a few real frames on a phone, with and without a hint, before merging: about 0.4 s with a hint and 7 s blind with D50 on a recent phone.

Star databases

The databases are not in the repository. The app reads them from the folder of each profile. D50 is the default for the Seestar: the densest that solves its frames within the time and space targets, with margin for poor nights.