diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 000000000000..6ad67b721fee
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "packages/google-crc32c/google_crc32c"]
+ path = packages/google-crc32c/google_crc32c
+ url = https://github.com/google/crc32c.git
diff --git a/.librarian/state.yaml b/.librarian/state.yaml
index c863eb88ee08..dfacd6bdb703 100644
--- a/.librarian/state.yaml
+++ b/.librarian/state.yaml
@@ -3549,6 +3549,15 @@ libraries:
remove_regex:
- packages/google-cloud-workstations/
tag_format: '{id}-v{version}'
+ - id: google-crc32c
+ version: 1.8.0
+ last_generated_commit: ""
+ apis: []
+ source_roots:
+ - packages/google-crc32c
+ preserve_regex: []
+ remove_regex: []
+ tag_format: '{id}-v{version}'
- id: google-geo-type
version: 0.5.0
last_generated_commit: 3322511885371d2b2253f209ccc3aa60d4100cfd
diff --git a/packages/google-crc32c/.coveragerc b/packages/google-crc32c/.coveragerc
new file mode 100644
index 000000000000..195287608806
--- /dev/null
+++ b/packages/google-crc32c/.coveragerc
@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Generated by synthtool. DO NOT EDIT!
+[run]
+branch = True
+omit =
+ google/__init__.py
+ google/cloud/__init__.py
+
+[report]
+fail_under = 100
+show_missing = True
+exclude_lines =
+ # Re-enable the standard pragma
+ pragma: NO COVER
+ # Ignore debug-only repr
+ def __repr__
+ # Ignore abstract methods
+ raise NotImplementedError
+omit =
+ */gapic/*.py
+ */proto/*.py
+ */core/*.py
+ */site-packages/*.py
+ google/cloud/__init__.py
diff --git a/packages/google-crc32c/.flake8 b/packages/google-crc32c/.flake8
new file mode 100644
index 000000000000..32986c79287a
--- /dev/null
+++ b/packages/google-crc32c/.flake8
@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Generated by synthtool. DO NOT EDIT!
+[flake8]
+ignore = E203, E231, E266, E501, W503
+exclude =
+ # Exclude generated code.
+ **/proto/**
+ **/gapic/**
+ **/services/**
+ **/types/**
+ *_pb2.py
+
+ # Standard linting exemptions.
+ **/.nox/**
+ __pycache__,
+ .git,
+ *.pyc,
+ conf.py
diff --git a/packages/google-crc32c/.repo-metadata.json b/packages/google-crc32c/.repo-metadata.json
new file mode 100644
index 000000000000..f853e7b029b4
--- /dev/null
+++ b/packages/google-crc32c/.repo-metadata.json
@@ -0,0 +1,14 @@
+{
+ "name": "google-crc32c",
+ "name_pretty": "A python wrapper of the C library 'Google CRC32C'",
+ "product_documentation": "",
+ "client_documentation": "https://github.com/googleapis/python-crc32c",
+ "issue_tracker": "https://github.com/googleapis/python-crc32c/issues",
+ "release_level": "stable",
+ "language": "python",
+ "library_type": "OTHER",
+ "repo": "googleapis/google-cloud-python",
+ "distribution_name": "google-crc32c",
+ "default_version": "",
+ "codeowner_team": ""
+}
diff --git a/packages/google-crc32c/BUILDING.md b/packages/google-crc32c/BUILDING.md
new file mode 100644
index 000000000000..bdc19ad9e040
--- /dev/null
+++ b/packages/google-crc32c/BUILDING.md
@@ -0,0 +1,92 @@
+
+# Building
+
+## Be sure to check out all submodules:
+
+```
+$ git clone --recursive https://github.com/googleapis/python-crc32c
+```
+
+## Building and Testing Wheels
+
+The scripts directory contains multiple scripts for building. They are also
+used by the CI workflows which can be found at .github/workflows.
+
+On Linux:
+
+```
+./scripts/manylinux/build.sh
+
+
+# Install the wheel that was built as a result
+pip install --no-index --find-links=wheels google-crc32c
+
+# Check the package, try and load the native library.
+python ./scripts/check_crc32c_extension.py
+```
+
+On OS X:
+
+```
+# Build the C library and wheel
+./scripts/osx/build.sh
+
+# Install the wheel that was built as a result
+pip install --no-index --find-links=wheels google-crc32c
+
+# Check the package, try and load the native library.
+python ./scripts/check_crc32c_extension.py
+```
+
+On Windows:
+
+```
+.\scripts\windows\build.bat
+.\scripts\windows\test.bat
+```
+
+
+## Installing locally for testing
+
+Initialize the submodules and build the main `libcrc32c.so` shared
+library using `cmake` / `make`:
+
+```bash
+$ cd python-crc32c
+$ git submodule update --init --recursive
+$ python -m venv venv
+$ venv/bin/pip install --upgrade setuptools pip wheel
+$ venv/bin/pip install cmake
+$ mkdir usr
+$ export CRC32C_INSTALL_PREFIX=$(pwd)/usr
+$ mkdir google_crc32c/build
+$ cd google_crc32c/build
+$ ../../venv/bin/cmake \
+> -DCMAKE_BUILD_TYPE=Release \
+> -DCRC32C_BUILD_TESTS=no \
+> -DCRC32C_BUILD_BENCHMARKS=no \
+> -DBUILD_SHARED_LIBS=yes \
+> -DCMAKE_INSTALL_PREFIX:PATH=${CRC32C_INSTALL_PREFIX} \
+> ..
+$ make all install
+$ cd ../..
+```
+
+Now, run the tests:
+
+```bash
+$ venv/bin/python setup.py build_ext \
+ --include-dirs=$(pwd)/usr/include \
+ --library-dirs=$(pwd)/usr/lib \
+ --rpath=$(pwd)/usr/lib
+$ venv/bin/pip install -e .[testing]
+$ venv/bin/py.test tests/
+============================= test session starts ==============================
+platform linux -- Python 3.6.7, pytest-3.10.0, py-1.7.0, pluggy-0.8.0
+rootdir: ..., inifile:
+collected 9 items
+
+tests/test___init__.py ......... [100%]
+
+=========================== 9 passed in 0.03 seconds ===========================
+```
diff --git a/packages/google-crc32c/CHANGELOG.md b/packages/google-crc32c/CHANGELOG.md
new file mode 100644
index 000000000000..aa9140456f8b
--- /dev/null
+++ b/packages/google-crc32c/CHANGELOG.md
@@ -0,0 +1,209 @@
+# Changelog
+
+[PyPI History][1]
+
+[1]: https://pypi.org/project/google-crc32c/#history
+
+## [1.8.0](https://github.com/googleapis/python-crc32c/compare/v1.7.1...v1.8.0) (2025-12-15)
+
+
+### Features
+
+* Add support for Python 3.14 ([d3118d9](https://github.com/googleapis/python-crc32c/commit/d3118d938b0acabc68fbc9d009aeb1e00445bc4c))
+* Support Python 3.14 ([#315](https://github.com/googleapis/python-crc32c/issues/315)) ([49d0a36](https://github.com/googleapis/python-crc32c/commit/49d0a36f3334048833d0201788fd864d3342d1b2))
+
+
+### Bug Fixes
+
+* Update toml file with setup.cfg content ([#319](https://github.com/googleapis/python-crc32c/issues/319)) ([42e5268](https://github.com/googleapis/python-crc32c/commit/42e5268c7e6077a71e54b342ada4ed2843dbc01e))
+
+## [1.8.0](https://github.com/googleapis/python-crc32c/compare/v1.7.1...v1.8.0) (2025-12-15)
+
+
+### Features
+
+* support Python 3.14 (#315) ([49d0a36f3334048833d0201788fd864d3342d1b2](https://github.com/googleapis/python-crc32c/commit/49d0a36f3334048833d0201788fd864d3342d1b2))
+
+
+### Bug Fixes
+
+* update toml file with setup.cfg content (#319) ([42e5268c7e6077a71e54b342ada4ed2843dbc01e](https://github.com/googleapis/python-crc32c/commit/42e5268c7e6077a71e54b342ada4ed2843dbc01e))
+
+## [1.7.1](https://github.com/googleapis/python-crc32c/compare/v1.7.0...v1.7.1) (2025-03-25)
+
+
+### Bug Fixes
+
+* Add Python 3.13 windows wheels ([fbb0e26](https://github.com/googleapis/python-crc32c/commit/fbb0e26b576fb82b8677b14505e702313cbcfe4e))
+
+## [1.7.0](https://github.com/googleapis/python-crc32c/compare/v1.6.0...v1.7.0) (2025-03-17)
+
+
+### Features
+
+* Add Python 3.13 trove classifier ([#233](https://github.com/googleapis/python-crc32c/issues/233)) ([b125257](https://github.com/googleapis/python-crc32c/commit/b1252575f21d0dde1e131f5251a989f56fb2c0d5))
+* Add support for python 3.13 ([#239](https://github.com/googleapis/python-crc32c/issues/239)) ([6b918f4](https://github.com/googleapis/python-crc32c/commit/6b918f4b081daf3cbee0cbd778b27c98670fb3a4))
+
+## [1.6.0](https://github.com/googleapis/python-crc32c/compare/v1.5.0...v1.6.0) (2024-08-29)
+
+
+### Features
+
+* Add support for python 3.12 ([#177](https://github.com/googleapis/python-crc32c/issues/177)) ([5ff1207](https://github.com/googleapis/python-crc32c/commit/5ff1207e7b60256e7a32932324ccb9ad4ec265d2))
+* Build using Visual Studio 17 2022 instead of Visual Studio 16 2019 ([c1c8c59](https://github.com/googleapis/python-crc32c/commit/c1c8c597d07e573406d76765022a837b007f9074))
+
+
+### Bug Fixes
+
+* Drop support for python 3.7 and 3.8 ([c1c8c59](https://github.com/googleapis/python-crc32c/commit/c1c8c597d07e573406d76765022a837b007f9074))
+* Drop support for Windows 32bit which is not supported in Visual Studio 17 2022 ([c1c8c59](https://github.com/googleapis/python-crc32c/commit/c1c8c597d07e573406d76765022a837b007f9074))
+* Remove manylinux1 which is no longer supported by PyPA ([#186](https://github.com/googleapis/python-crc32c/issues/186)) ([79edb3f](https://github.com/googleapis/python-crc32c/commit/79edb3fd3cda0e4193a6fb6a8346058398df43de))
+
+## [1.5.0](https://github.com/googleapis/python-crc32c/compare/v1.4.0...v1.5.0) (2022-08-31)
+
+
+### Features
+
+* add support for Python 3.11 ([#144](https://github.com/googleapis/python-crc32c/issues/144)) ([63f5166](https://github.com/googleapis/python-crc32c/commit/63f5166815682d3430a771c51c7fd5a81d2fd259))
+
+
+### Bug Fixes
+
+* drop support for python 3.6 ([#145](https://github.com/googleapis/python-crc32c/issues/145)) ([f9745b8](https://github.com/googleapis/python-crc32c/commit/f9745b8089fa2645be7b8823c979f5192df3eec7))
+
+
+### Documentation
+
+* fix changelog header to consistent size ([#136](https://github.com/googleapis/python-crc32c/issues/136)) ([0fb3b88](https://github.com/googleapis/python-crc32c/commit/0fb3b88131aeee316e6d6f607fa32ec4767e4386))
+
+## [1.4.0](https://github.com/googleapis/python-crc32c/compare/v1.3.0...v1.4.0) (2022-03-10)
+
+
+### Features
+
+* add 'py.typed' declaration ([#119](https://github.com/googleapis/python-crc32c/issues/119)) ([f1c91c2](https://github.com/googleapis/python-crc32c/commit/f1c91c277f1baac2ca8d60dd1e45361551ad3140))
+
+
+### Bug Fixes
+
+* add empty slots to CommonChecksum ([#121](https://github.com/googleapis/python-crc32c/issues/121)) ([c21cb89](https://github.com/googleapis/python-crc32c/commit/c21cb8923728801d732c11f6531a2415a1e5cd3f))
+
+## [1.3.0](https://www.github.com/googleapis/python-crc32c/compare/v1.2.0...v1.3.0) (2021-10-05)
+
+
+### Features
+
+* add support for Python 3.10 ([#116](https://www.github.com/googleapis/python-crc32c/issues/116)) ([01ee9c0](https://www.github.com/googleapis/python-crc32c/commit/01ee9c0b4d6a992ddcf1fbbeaaea9d107c972b74))
+
+## [1.2.0](https://www.github.com/googleapis/python-crc32c/compare/v1.1.5...v1.2.0) (2021-09-17)
+
+
+### Features
+
+* build wheels using CIBuildWheel ([#103](https://www.github.com/googleapis/python-crc32c/issues/103)) ([55eb731](https://www.github.com/googleapis/python-crc32c/commit/55eb7310b0a0f424da33f4b6d3b4b50e02c323eb))
+
+
+### Documentation
+
+* update list of supported wheel platforms / architectures ([#105](https://www.github.com/googleapis/python-crc32c/issues/105)) ([edc8d2d](https://www.github.com/googleapis/python-crc32c/commit/edc8d2dbe643f0c2bf1180f855e1585b0e81bdba))
+
+## [1.1.5](https://www.github.com/googleapis/python-crc32c/compare/v1.1.4...v1.1.5) (2021-09-07)
+
+
+### Bug Fixes
+
+* revert to silent fallback to pure-Python build ([#93](https://www.github.com/googleapis/python-crc32c/issues/93)) ([789a420](https://www.github.com/googleapis/python-crc32c/commit/789a4203648d1b43f060332510177cf3867f82c4))
+* fix segfault on MacOS 11 ("Big Sur") for Python < 3.9 ([#93](https://www.github.com/googleapis/python-crc32c/issues/93)) ([789a420](https://www.github.com/googleapis/python-crc32c/commit/789a4203648d1b43f060332510177cf3867f82c4))
+
+## [1.1.4](https://www.github.com/googleapis/python-crc32c/compare/v1.1.4...v1.1.4) (2021-09-02)
+
+
+### Bug Fixes
+
+* advise setting 'CRC32C_PURE_PYTHON' after build failure ([#84](https://www.github.com/googleapis/python-crc32c/issues/84)) ([6aa1cd6](https://www.github.com/googleapis/python-crc32c/commit/6aa1cd69376b57fbc9bc2c470ed63a270279623d))
+* restore building 'manylinux1' wheels ([#87](https://www.github.com/googleapis/python-crc32c/issues/87)) ([ebb9c68](https://www.github.com/googleapis/python-crc32c/commit/ebb9c68aca66e6b89d832e9e237679ac8b9ad344))
+* use correct Python 3.10 specifier ([#88](https://www.github.com/googleapis/python-crc32c/issues/88)) ([0c1b740](https://www.github.com/googleapis/python-crc32c/commit/0c1b740c195caed8ac1e67fc38d87073223a6b3d))
+
+## [1.1.4](https://www.github.com/googleapis/python-crc32c/compare/v1.1.3...v1.1.4) (2021-09-01)
+
+
+### Bug Fixes
+
+* advise setting 'CRC32C_PURE_PYTHON' after build failure ([#84](https://www.github.com/googleapis/python-crc32c/issues/84)) ([6aa1cd6](https://www.github.com/googleapis/python-crc32c/commit/6aa1cd69376b57fbc9bc2c470ed63a270279623d))
+* restore building 'manylinux1' wheels ([#87](https://www.github.com/googleapis/python-crc32c/issues/87)) ([ebb9c68](https://www.github.com/googleapis/python-crc32c/commit/ebb9c68aca66e6b89d832e9e237679ac8b9ad344))
+
+## [1.1.3](https://www.github.com/googleapis/python-crc32c/compare/v1.1.2...v1.1.3) (2021-08-30)
+
+
+### Performance Improvements
+
+* replace CFFI with a native C extension ([#76](https://www.github.com/googleapis/python-crc32c/issues/76)) ([b1bf461](https://www.github.com/googleapis/python-crc32c/commit/b1bf461cc0539962ac16a62860cae3cd2384cb4f))
+
+## [1.1.2](https://www.github.com/googleapis/python-crc32c/compare/v1.1.1...v1.1.2) (2021-01-20)
+
+
+### Bug Fixes
+
+* add manylinux2014_aarch64 wheels ([#61](https://www.github.com/googleapis/python-crc32c/issues/61)) ([6387658](https://www.github.com/googleapis/python-crc32c/commit/63876582aec715100f61581657f9d994a1ace1bc))
+* Add manylinux2014_x86_64 wheels ([#57](https://www.github.com/googleapis/python-crc32c/issues/57)) ([74cb457](https://www.github.com/googleapis/python-crc32c/commit/74cb457255a81d0aa5bee16425675140ed637410))
+
+
+### Documentation
+
+* add aarch64 to the readme as produced wheels ([#62](https://www.github.com/googleapis/python-crc32c/issues/62)) ([4ef317d](https://www.github.com/googleapis/python-crc32c/commit/4ef317d0efcd654842d17e03749b801303c8bc30))
+
+## [1.1.1](https://www.github.com/googleapis/python-crc32c/compare/v1.1.0...v1.1.1) (2021-01-14)
+
+
+### Bug Fixes
+
+* Update CI to use GitHub actions and build for osx, windows, linux ([#51](https://www.github.com/googleapis/python-crc32c/issues/51)) ([66f49b8](https://www.github.com/googleapis/python-crc32c/commit/66f49b889ad66f7ecd5d6aeaf840f2c8f2ac131e))
+
+
+### Documentation
+
+* simplify main readme that is shown on pypi, add additional BUILDING.md ([#54](https://www.github.com/googleapis/python-crc32c/issues/54)) ([93e021f](https://www.github.com/googleapis/python-crc32c/commit/93e021fe8bc55fb046317b884ca21cb75e131e4f))
+
+## [1.1.0](https://www.github.com/googleapis/python-crc32c/compare/v0.1.1...v1.1.0) (2020-12-14)
+
+
+### Features
+
+* add Python 3.9 support, drop Python 3.5 support ([#42](https://www.github.com/googleapis/python-crc32c/issues/42)) ([1d7fe63](https://www.github.com/googleapis/python-crc32c/commit/1d7fe6338fbcb0e74245f84c2034ac5371f7782a)), closes [#38](https://www.github.com/googleapis/python-crc32c/issues/38)
+
+
+### Bug Fixes
+
+* add LICENSE to package manifest ([#34](https://www.github.com/googleapis/python-crc32c/issues/34)) ([6c8883b](https://www.github.com/googleapis/python-crc32c/commit/6c8883b2c41aaa6f0dd5991896ad58e73f516182))
+
+## [1.0.0](https://www.github.com/googleapis/python-crc32c/compare/v0.1.0...v1.0.0) (2020-08-07)
+
+### Breaking Changes
+* prefix module name with 'google_' to avoid conflict with ICRAR version ([#30](https://www.github.com/googleapis/python-crc32c/issues/30)) ([b50f43e](https://www.github.com/googleapis/python-crc32c/commit/b50f43e7bc40d91ccdade9ccc577a93c0ed05f3a)), closes [#29](https://www.github.com/googleapis/python-crc32c/issues/29)
+
+### Documentation
+
+* rewrap long line ([#32](https://www.github.com/googleapis/python-crc32c/issues/32)) ([30479d4](https://www.github.com/googleapis/python-crc32c/commit/30479d41997a09115aa0152b39ffef09bc97b13a))
+
+## [0.1.0](https://www.github.com/googleapis/python-crc32c/compare/v0.0.2...v0.1.0) (2020-03-20)
+
+
+### Features
+
+* add pure python implementation ([#20](https://www.github.com/googleapis/python-crc32c/issues/20)) ([97cf381](https://www.github.com/googleapis/python-crc32c/commit/97cf3819035486628b2dcc2ad03e3b427fbf8046))
+
+
+### Bug Fixes
+
+* retrieve package version at runtime ([#24](https://www.github.com/googleapis/python-crc32c/issues/24)) ([f365e47](https://www.github.com/googleapis/python-crc32c/commit/f365e471c9ae90238ded65456635ccdb6cd33ca2))
+
+## 0.0.2
+
+03-09-2020 15:33 PDT
+
+
+### Packaging Changes
+- fix: add a manifest to specify other files ([#14](https://github.com/googleapis/python-crc32c/pull/14))
+
+### Documentation
+- docs: README.md improvements ([#15](https://github.com/googleapis/python-crc32c/pull/15))
diff --git a/packages/google-crc32c/CONTRIBUTING.md b/packages/google-crc32c/CONTRIBUTING.md
new file mode 100644
index 000000000000..ebbb59e5310f
--- /dev/null
+++ b/packages/google-crc32c/CONTRIBUTING.md
@@ -0,0 +1,28 @@
+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution;
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
+
+## Community Guidelines
+
+This project follows
+[Google's Open Source Community Guidelines](https://opensource.google.com/conduct/).
\ No newline at end of file
diff --git a/packages/google-crc32c/LICENSE b/packages/google-crc32c/LICENSE
new file mode 100644
index 000000000000..d64569567334
--- /dev/null
+++ b/packages/google-crc32c/LICENSE
@@ -0,0 +1,202 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
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+ To apply the Apache License to your work, attach the following
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+ Copyright [yyyy] [name of copyright owner]
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+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
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+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
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diff --git a/packages/google-crc32c/MANIFEST.in b/packages/google-crc32c/MANIFEST.in
new file mode 100644
index 000000000000..2fb6b766f58a
--- /dev/null
+++ b/packages/google-crc32c/MANIFEST.in
@@ -0,0 +1,2 @@
+include src/google_crc32c_build.py
+include LICENSE
diff --git a/packages/google-crc32c/README.md b/packages/google-crc32c/README.md
new file mode 100644
index 000000000000..78088ce883b1
--- /dev/null
+++ b/packages/google-crc32c/README.md
@@ -0,0 +1,37 @@
+# `google-crc32c`
+ [
](https://pypi.org/project/google-crc32c) 
+
+This package wraps the [`google/crc32c`](https://github.com/google/crc32c)
+hardware-based implementation of the CRC32C hashing algorithm. Multiple wheels
+are distributed as well as source. If a wheel is not published for the python
+version and platform you are using, you will need to compile crc32c using a
+C toolchain.
+
+# Currently Published Wheels
+
+Wheels are currently published for CPython 3.9, 3.10, 3.11, 3.12, 3.13 and 3.14
+for multiple architectures. PyPy 3.9 and 3.10 are also supported for Linux.
+For information on building your own wheels please view [BUILDING.md](BUILDING.md).
+
+
+## Linux
+
+Wheels are published for the following platforms / architectures:
+
+- `manylinux2010` platform, `x86_64` and `1686` architectures
+- `manylinux2014` platform, `aarch64` architecture
+
+### Unsupported Platforms
+
+- `manylinux1` platform, `x86_64` architecture support has ended.
+
+See https://github.com/pypa/manylinux/issues/994.
+
+## Mac OS
+
+Wheels are published for `x86_64` and `arm64` architectures.
+
+
+## Windows
+
+Wheels are published for the `win_amd64` architecture.
diff --git a/packages/google-crc32c/google_crc32c b/packages/google-crc32c/google_crc32c
new file mode 160000
index 000000000000..02e65f4fd306
--- /dev/null
+++ b/packages/google-crc32c/google_crc32c
@@ -0,0 +1 @@
+Subproject commit 02e65f4fd3065d27b2e29324800ca6d04df16126
diff --git a/packages/google-crc32c/mypy.ini b/packages/google-crc32c/mypy.ini
new file mode 100644
index 000000000000..8efb6f7241c8
--- /dev/null
+++ b/packages/google-crc32c/mypy.ini
@@ -0,0 +1,3 @@
+[mypy]
+python_version = 3.9
+exclude = tests/unit/resources/
diff --git a/packages/google-crc32c/noxfile.py b/packages/google-crc32c/noxfile.py
new file mode 100644
index 000000000000..0a859e12c7aa
--- /dev/null
+++ b/packages/google-crc32c/noxfile.py
@@ -0,0 +1,176 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Generated by synthtool. DO NOT EDIT!
+
+import os
+import sys
+
+import nox
+
+HERE = os.path.dirname(__file__)
+
+# Constants
+DEFAULT_PYTHON_VERSION = "3.14"
+UNIT_TEST_PYTHON_VERSIONS = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+ALL_PYTHON = list(UNIT_TEST_PYTHON_VERSIONS)
+ALL_PYTHON.extend(["3.7"])
+
+FLAKE8_VERSION = "flake8==6.1.0"
+BLACK_VERSION = "black[jupyter]==23.7.0"
+ISORT_VERSION = "isort==5.11.0"
+LINT_PATHS = ["src", "tests", "noxfile.py", "setup.py"]
+
+nox.options.sessions = [
+ "build_libcrc32c",
+ "check",
+ "lint",
+ "blacken",
+ "format",
+ "lint_setup_py",
+ "mypy",
+ "prerelease_deps",
+ "core_deps_from_source",
+ "unit",
+ "docs",
+ "docfx",
+]
+
+
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+def build_libcrc32c(session):
+ session.env["PY_BIN"] = f"python{session.python}"
+ session.env["REPO_ROOT"] = HERE
+
+ if sys.platform.startswith("win"):
+ session.run("cmd", "-c", "scripts\\windows\\build.bat")
+ elif sys.platform == "linux":
+ session.run("bash", "scripts/local-linux/build_libcrc32c.sh")
+ elif sys.platform == "darwin":
+ session.run("bash", "scripts/osx/build.sh")
+ else:
+ raise Exception("Unsupported")
+
+
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
+def check(session):
+ session.install("pytest")
+ session.install("--no-index", f"--find-links={HERE}/wheels", "google-crc32c")
+
+ # Run py.test against the unit tests.
+ session.run("py.test", "tests")
+ session.run("python", f"{HERE}/scripts/check_crc32c_extension.py", *session.posargs)
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def mypy(session):
+ """Verify type hints are mypy compatible."""
+ session.install(
+ "mypy",
+ "types-mock",
+ "types-setuptools",
+ )
+ session.env["MYPYPATH"] = "src"
+ session.run("mypy", "src/google_crc32c/", "tests/")
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def lint(session):
+ """Run linters.
+
+ Returns a failure if the linters find linting errors or sufficiently
+ serious code quality issues.
+ """
+ session.install(FLAKE8_VERSION, BLACK_VERSION)
+ session.run(
+ "black",
+ "--check",
+ *LINT_PATHS,
+ )
+ session.run("flake8", *LINT_PATHS)
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def blacken(session):
+ """Run black. Format code to uniform standard."""
+ session.install(BLACK_VERSION)
+ session.run(
+ "black",
+ *LINT_PATHS,
+ )
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def format(session):
+ """
+ Run isort to sort imports. Then run black
+ to format code to uniform standard.
+ """
+ session.install(BLACK_VERSION, ISORT_VERSION)
+ # Use the --fss option to sort imports using strict alphabetical order.
+ # See https://pycqa.github.io/isort/docs/configuration/options.html#force-sort-within-sections
+ session.run(
+ "isort",
+ "--fss",
+ *LINT_PATHS,
+ )
+ session.run(
+ "black",
+ *LINT_PATHS,
+ )
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def lint_setup_py(session):
+ """Verify that setup.py is valid (including RST check)."""
+ session.install("docutils", "pygments", "setuptools")
+ session.run("python", "setup.py", "check", "--restructuredtext", "--strict")
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def prerelease_deps(session):
+ """Run all tests with prerelease versions of dependencies installed."""
+ # TODO(https://github.com/googleapis/google-cloud-python/issues/16014):
+ # Add prerelease deps tests
+ session.skip("prerelease deps tests are not yet supported")
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def core_deps_from_source(session):
+ """Run all tests with core dependencies installed from source
+ rather than pulling the dependencies from PyPI.
+ """
+ # TODO(https://github.com/googleapis/google-cloud-python/issues/16014):
+ # Add core deps from source tests
+ session.skip("Core deps from source tests are not yet supported")
+
+
+@nox.session(python=ALL_PYTHON)
+def unit(session):
+ """Run all unit tests."""
+ session.skip("Unit tests are not supported")
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def docs(session):
+ """Run all docs tests."""
+ session.skip("Docs tests are not supported")
+
+
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def docfx(session):
+ """Run all docfx tests."""
+ session.skip("Docfx tests are not supported")
diff --git a/packages/google-crc32c/pyproject.toml b/packages/google-crc32c/pyproject.toml
new file mode 100644
index 000000000000..ddff644d32e6
--- /dev/null
+++ b/packages/google-crc32c/pyproject.toml
@@ -0,0 +1,24 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "google-crc32c"
+version = "1.8.0"
+description = "A python wrapper of the C library 'Google CRC32C'"
+readme = "README.md"
+requires-python = ">=3.8"
diff --git a/packages/google-crc32c/scripts/check_crc32c_extension.py b/packages/google-crc32c/scripts/check_crc32c_extension.py
new file mode 100644
index 000000000000..dc4a85aa349f
--- /dev/null
+++ b/packages/google-crc32c/scripts/check_crc32c_extension.py
@@ -0,0 +1,24 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from google_crc32c import _crc32c
+
+
+def main():
+ print("_crc32c: {}".format(_crc32c))
+ print("dir(_crc32c): {}".format(dir(_crc32c)))
+
+
+if __name__ == "__main__":
+ main()
diff --git a/packages/google-crc32c/scripts/dev-requirements.txt b/packages/google-crc32c/scripts/dev-requirements.txt
new file mode 100644
index 000000000000..7479544b333a
--- /dev/null
+++ b/packages/google-crc32c/scripts/dev-requirements.txt
@@ -0,0 +1,5 @@
+auditwheel >= 2.1.1; sys_platform == 'linux' or sys_platform == 'linux2'
+delocate >= 0.8.0; sys_platform == 'darwin'
+setuptools >= 42.0.2
+# See: https://github.com/pypa/auditwheel/issues/102
+wheel >= 0.34
diff --git a/packages/google-crc32c/scripts/local-linux/build_libcrc32c.sh b/packages/google-crc32c/scripts/local-linux/build_libcrc32c.sh
new file mode 100755
index 000000000000..705f24771903
--- /dev/null
+++ b/packages/google-crc32c/scripts/local-linux/build_libcrc32c.sh
@@ -0,0 +1,55 @@
+#!/bin/bash
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e -x
+
+PY_BIN=${PY_BIN:-python3.9}
+REPO_ROOT=${REPO_ROOT:-$(pwd)}
+
+CRC32C_INSTALL_PREFIX=${REPO_ROOT}/usr
+
+# NOTE: This assumes the local install has an up-to-date `pip`.
+# Create a virtualenv where we can install `cmake`.
+VENV=${REPO_ROOT}/venv
+${PY_BIN} -m venv ${VENV}
+${VENV}/bin/python -m pip install --upgrade setuptools pip wheel
+${VENV}/bin/python -m pip install "cmake >= 3.12.0"
+rm -rf ${REPO_ROOT}/build
+rm -rf ${CRC32C_INSTALL_PREFIX}
+# Build `libcrc32c`
+cd ${REPO_ROOT}/google_crc32c
+rm -rf build
+mkdir build
+cd build/
+${VENV}/bin/cmake \
+ -DCMAKE_BUILD_TYPE=Release \
+ -DCRC32C_BUILD_TESTS=no \
+ -DCRC32C_BUILD_BENCHMARKS=no \
+ -DBUILD_SHARED_LIBS=yes \
+ -DCMAKE_INSTALL_PREFIX:PATH=${CRC32C_INSTALL_PREFIX} \
+ ..
+# Install `libcrc32c` into CRC32C_INSTALL_PREFIX.
+make all install
+
+cd ${REPO_ROOT}
+
+${VENV}/bin/python setup.py build_ext \
+ --include-dirs=${REPO_ROOT}/usr/include \
+ --library-dirs=${REPO_ROOT}/usr/lib \
+ --rpath=${REPO_ROOT}/usr/lib
+${VENV}/bin/python -m pip wheel . --wheel-dir=wheels
+
+# Clean up.
+rm -fr ${REPO_ROOT}/google_crc32c/build
+rm -fr ${VENV}
diff --git a/packages/google-crc32c/scripts/manylinux/build.sh b/packages/google-crc32c/scripts/manylinux/build.sh
new file mode 100755
index 000000000000..91397c8eba00
--- /dev/null
+++ b/packages/google-crc32c/scripts/manylinux/build.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e -x
+echo "BUILDING ON LINUX"
+export BUILD_PYTHON=${BUILD_PYTHON}
+
+MANYLINUX_DIR=$(echo $(cd $(dirname ${0}); pwd))
+SCRIPTS_DIR=$(dirname ${MANYLINUX_DIR})
+REPO_ROOT=$(dirname ${SCRIPTS_DIR})
+
+sudo apt-get install -y software-properties-common
+sudo add-apt-repository -y ppa:deadsnakes/ppa
+sudo apt-get update
+sudo apt-get install -y python3.12
+
+cd $REPO_ROOT
+# Add directory as safe to avoid "detected dubious ownership" fatal issue1
+git config --global --add safe.directory $REPO_ROOT
+git config --global --add safe.directory $REPO_ROOT/google_crc32c
+git submodule update --init --recursive
+
+
+
+docker pull quay.io/pypa/manylinux2014_x86_64
+docker run \
+ --rm \
+ --interactive \
+ --volume ${REPO_ROOT}:/var/code/python-crc32c/ \
+ --env BUILD_PYTHON=${BUILD_PYTHON} \
+ quay.io/pypa/manylinux2014_x86_64 \
+ /var/code/python-crc32c/scripts/manylinux/build_on_centos.sh
+
+docker run --rm --privileged hypriot/qemu-register
+docker pull quay.io/pypa/manylinux2014_aarch64
+docker run \
+ --rm \
+ --interactive \
+ --volume ${REPO_ROOT}:/var/code/python-crc32c/ \
+ --env BUILD_PYTHON=${BUILD_PYTHON} \
+ quay.io/pypa/manylinux2014_aarch64 \
+ /var/code/python-crc32c/scripts/manylinux/build_on_centos.sh
+
+if [[ "${PUBLISH_WHEELS}" == "true" ]]; then
+ . /${MANYLINUX_DIR}/publish_python_wheel.sh
+fi
diff --git a/packages/google-crc32c/scripts/manylinux/build_on_centos.sh b/packages/google-crc32c/scripts/manylinux/build_on_centos.sh
new file mode 100755
index 000000000000..9507dda09262
--- /dev/null
+++ b/packages/google-crc32c/scripts/manylinux/build_on_centos.sh
@@ -0,0 +1,119 @@
+#!/bin/bash
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e -x
+MAIN_PYTHON_BIN="/opt/python/cp39-cp39/bin/"
+echo "BUILD_PYTHON: ${BUILD_PYTHON}"
+REPO_ROOT=/var/code/python-crc32c/
+
+# Install `openssl-devel` so that `cmake` can be built.
+yum install -y openssl-devel
+
+# Upgrade `pip` before using it.
+${MAIN_PYTHON_BIN}/python -m pip install --upgrade pip
+# Install `cmake` (i.e. non-Python build dependency).
+${MAIN_PYTHON_BIN}/python -m pip install "cmake >= 3.12.0"
+# Install Python build dependencies.
+${MAIN_PYTHON_BIN}/python -m pip install \
+ --requirement ${REPO_ROOT}/scripts/dev-requirements.txt
+
+# Build and install `crc32c`
+cd ${REPO_ROOT}/google_crc32c/
+rm -rf build
+mkdir build
+cd build/
+cmake \
+ -DCMAKE_BUILD_TYPE=Release \
+ -DCRC32C_BUILD_TESTS=no \
+ -DCRC32C_BUILD_BENCHMARKS=no \
+ -DBUILD_SHARED_LIBS=yes \
+ -DCMAKE_POLICY_VERSION_MINIMUM=3.12 \
+ ..
+make all install
+
+PYTHON_VERSIONS=""
+if [[ -z ${BUILD_PYTHON} ]]; then
+ # Collect all target Python versions.
+ for PYTHON_BIN in /opt/python/*/bin; do
+ # H/T: https://stackoverflow.com/a/229606/1068170
+ if [[ "${PYTHON_BIN}" == *"39"* ]]; then
+ PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+ continue
+ elif [[ "${PYTHON_BIN}" == *"310"* ]]; then
+ PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+ continue
+ elif [[ "${PYTHON_BIN}" == *"311"* ]]; then
+ PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+ continue
+ elif [[ "${PYTHON_BIN}" == *"312"* ]]; then
+ PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+ continue
+ elif [[ "${PYTHON_BIN}" == *"313"* && "${PYTHON_BIN}" != *"313t"* ]]; then
+ PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+ continue
+ elif [[ "${PYTHON_BIN}" == *"314"* && "${PYTHON_BIN}" != *"314t"* ]]; then
+ PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+ continue
+ else
+ echo "Ignoring unsupported version: ${PYTHON_BIN}"
+ echo "====================================="
+ fi
+ done
+else
+ STRIPPED_PYTHON=$(echo ${BUILD_PYTHON} | sed -e "s/\.//g" | sed -e "s/-dev$//")
+ for PYTHON_BIN in /opt/python/*/bin; do
+ if [[ "${PYTHON_BIN}" == *"${STRIPPED_PYTHON}"* ]]; then
+ PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+ fi
+ done
+fi
+
+# Build the wheels.
+cd ${REPO_ROOT}
+for PYTHON_BIN in ${PYTHON_VERSIONS}; do
+ ${PYTHON_BIN}/python -m pip install --upgrade pip
+ ${PYTHON_BIN}/python -m pip install \
+ --requirement ${REPO_ROOT}/scripts/dev-requirements.txt
+ ${PYTHON_BIN}/python -m pip wheel . --wheel-dir dist_wheels/
+done
+
+# Bundle external shared libraries into the wheels
+for whl in dist_wheels/google_crc32c*.whl; do
+ "${MAIN_PYTHON_BIN}/auditwheel" repair "${whl}" --wheel-dir wheels/
+done
+
+# Install and test wheels
+for PYTHON_BIN in ${PYTHON_VERSIONS}; do
+ # Identify the short python version e.g. "39", "310"
+ # Get the ABI tag from the Python binary's path, e.g., "cp310-cp310"
+ ABI_TAG=$(basename $(dirname ${PYTHON_BIN}))
+ ARCH=$(uname -m)
+ # Create a virtual environment to install and test the wheel
+ ${PYTHON_BIN}/python -m venv /tmp/venv
+
+ # Find the correct wheel file using the precise ABI tag and architecture.
+ WHEEL_FILE=$(ls ${REPO_ROOT}/wheels/google_crc32c-*-${ABI_TAG}-*manylinux*${ARCH}*.whl) # Install the wheel
+ /tmp/venv/bin/pip install "${WHEEL_FILE}"
+
+ # Verify that the module is installed and peek at contents.
+ /tmp/venv/bin/python ${REPO_ROOT}/scripts/check_crc32c_extension.py
+
+ # Clean up the virtual environment
+ rm -rf /tmp/venv
+done
+
+# Clean up.
+rm -fr ${REPO_ROOT}/google_crc32c/build/
+rm -fr ${REPO_ROOT}/dist_wheels/
diff --git a/packages/google-crc32c/scripts/manylinux/publish_python_wheel.sh b/packages/google-crc32c/scripts/manylinux/publish_python_wheel.sh
new file mode 100755
index 000000000000..7b5bdf6d3520
--- /dev/null
+++ b/packages/google-crc32c/scripts/manylinux/publish_python_wheel.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eo pipefail
+
+python -m pip install "setuptools<71"
+
+# Start the releasetool reporter
+python -m pip install --require-hashes -r ${REPO_ROOT}/.kokoro/requirements.txt
+python -m releasetool publish-reporter-script > /tmp/publisher-script; source /tmp/publisher-script
+
+ls ${REPO_ROOT}/wheels/
+# Disable logging
+set +x
+TWINE_PASSWORD=$(cat "${KOKORO_KEYSTORE_DIR}/73713_google-cloud-pypi-token-keystore-3")
+python -m twine upload --skip-existing --username __token__ --password "${TWINE_PASSWORD}" ${REPO_ROOT}/wheels/*
diff --git a/packages/google-crc32c/scripts/osx/build.sh b/packages/google-crc32c/scripts/osx/build.sh
new file mode 100755
index 000000000000..7000337c70b4
--- /dev/null
+++ b/packages/google-crc32c/scripts/osx/build.sh
@@ -0,0 +1,55 @@
+#!/bin/bash
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e -x
+echo "BUILDING FOR OSX"
+
+# set deployment target
+export MACOSX_DEPLOYMENT_TARGET=12
+
+# ``readlink -f`` is not our friend on OS X. This relies on **some**
+# ``python`` being installed.
+SCRIPT_FI=$(python3 -c "import os; print(os.path.realpath('${0}'))")
+OSX_DIR=$(dirname ${SCRIPT_FI})
+SCRIPTS_DIR=$(dirname ${OSX_DIR})
+export REPO_ROOT=$(dirname ${SCRIPTS_DIR})
+
+# Build and install `libcrc32c`
+export PY_BIN="python3"
+export CRC32C_INSTALL_PREFIX="${REPO_ROOT}/usr"
+
+cd ${REPO_ROOT}
+# Add directory as safe to avoid "detected dubious ownership" fatal issue
+git config --global --add safe.directory $REPO_ROOT
+git config --global --add safe.directory $REPO_ROOT/google_crc32c
+git submodule update --init --recursive
+
+${OSX_DIR}/build_c_lib.sh
+
+# reinstall pyenv
+rm -rf /Users/kbuilder/.pyenv
+git clone https://github.com/pyenv/pyenv.git /Users/kbuilder/.pyenv
+
+SUPPORTED_PYTHON_VERSIONS=("3.9" "3.10" "3.11" "3.12" "3.13" "3.14")
+
+for PYTHON_VERSION in ${SUPPORTED_PYTHON_VERSIONS[@]}; do
+ echo "Build wheel for Python ${PYTHON_VERSION}"
+ export PY_BIN=$PYTHON_VERSION
+ export PY_TAG="cp${PYTHON_VERSION//.}-cp${PYTHON_VERSION//.}"
+ . /${OSX_DIR}/build_python_wheel.sh
+done
+
+# Clean up.
+rm -fr ${CRC32C_INSTALL_PREFIX}
diff --git a/packages/google-crc32c/scripts/osx/build_c_lib.sh b/packages/google-crc32c/scripts/osx/build_c_lib.sh
new file mode 100755
index 000000000000..4d9ae0e6543c
--- /dev/null
+++ b/packages/google-crc32c/scripts/osx/build_c_lib.sh
@@ -0,0 +1,77 @@
+#!/bin/bash
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Build and install `libcrc32c`
+
+set -e -x
+
+# Check that the install prefix is set. Exit early if the
+# directory already exists.
+if [[ -z "${CRC32C_INSTALL_PREFIX}" ]]; then
+ echo "CRC32C_INSTALL_PREFIX environment variable should be set by the caller."
+ exit 1
+fi
+if [[ -d "${CRC32C_INSTALL_PREFIX}" ]]; then
+ echo "CRC32C_INSTALL_PREFIX=${CRC32C_INSTALL_PREFIX} already exists."
+ exit 0
+fi
+
+# Check that the REPO_ROOT and PY_BIN environment variables are set.
+if [[ -z "${REPO_ROOT}" ]]; then
+ echo "REPO_ROOT environment variable should be set by the caller."
+ exit 1
+fi
+
+if [[ -z "${PY_BIN}" ]]; then
+ echo "PY_BIN environment variable should be set by the caller."
+ exit 1
+fi
+
+# Precreate install directories for crc32 lib.
+mkdir -p ${CRC32C_INSTALL_PREFIX}
+mkdir -p ${CRC32C_INSTALL_PREFIX}/lib
+
+# Create a virtualenv where we can install `cmake`.
+VENV=${REPO_ROOT}/venv_build_libcrc32c
+${PY_BIN} -m venv ${VENV}
+${VENV}/bin/python -m pip install --upgrade pip
+${VENV}/bin/python -m pip install "cmake >= 3.12.0"
+
+# Build `libcrc32c`
+cd ${REPO_ROOT}/google_crc32c
+mkdir -p build
+cd build
+ls
+
+# We don't build i386 anymore as XCode no longer supports.
+${VENV}/bin/cmake \
+ -DCMAKE_BUILD_TYPE=Release \
+ -DCMAKE_OSX_DEPLOYMENT_TARGET=10.9 \
+ -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" \
+ -DCRC32C_BUILD_TESTS=no \
+ -DCRC32C_BUILD_BENCHMARKS=no \
+ -DBUILD_SHARED_LIBS=yes \
+ -DCMAKE_INSTALL_PREFIX:PATH=${CRC32C_INSTALL_PREFIX} \
+ -DCMAKE_INSTALL_NAME_DIR:PATH=${CRC32C_INSTALL_PREFIX}/lib \
+ -DCMAKE_POLICY_VERSION_MINIMUM=3.12 \
+ ..
+
+# Install `libcrc32c` into CRC32C_INSTALL_PREFIX.
+make all install
+
+# Clean up.
+cd ..
+rm -fr ${REPO_ROOT}/google_crc32c/build
+rm -fr ${VENV}
diff --git a/packages/google-crc32c/scripts/osx/build_python_wheel.sh b/packages/google-crc32c/scripts/osx/build_python_wheel.sh
new file mode 100755
index 000000000000..c63241677364
--- /dev/null
+++ b/packages/google-crc32c/scripts/osx/build_python_wheel.sh
@@ -0,0 +1,104 @@
+#!/bin/bash
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Build a **single** Python wheel for a specified version. The version and
+# associated paths should be set as environment variables; the expected
+# environment variables will be verified below.
+
+set -e -x
+
+# Check that the REPO_ROOT, PY_BIN and PY_TAG environment variables are set.
+if [[ -z "${REPO_ROOT}" ]]; then
+ echo "REPO_ROOT environment variable should be set by the caller."
+ exit 1
+fi
+if [[ -z "${PY_BIN}" ]]; then
+ echo "PY_BIN environment variable should be set by the caller."
+ exit 1
+fi
+if [[ -z "${PY_TAG}" ]]; then
+ echo "PY_TAG environment variable should be set by the caller."
+ exit 1
+fi
+
+# set up pyenv & shell environment for switching across python versions
+eval "$(pyenv init -)"
+eval "$(pyenv init --path)"
+
+install_python_pyenv() {
+ version=$1
+
+ if [ -z "$(pyenv versions --bare | grep $version)" ]; then
+ echo "Python $version is not installed. Installing..."
+ pyenv install $version
+ echo "Python $version installed."
+ else
+ echo "Python $version is already installed."
+ fi
+ pyenv shell $version
+}
+install_python_pyenv ${PY_BIN}
+
+
+# ``readlink -f`` is not our friend on OS X. This relies on **some**
+# ``python`` being installed.
+SCRIPT_FI=$(python3 -c "import os; print(os.path.realpath('${0}'))")
+OSX_DIR=$(dirname ${SCRIPT_FI})
+SCRIPTS_DIR=$(dirname ${OSX_DIR})
+export REPO_ROOT=$(dirname ${SCRIPTS_DIR})
+
+# Create a virtualenv where we can install Python build dependencies.
+VENV=${REPO_ROOT}/venv${PY_BIN}
+"python${PY_BIN}" -m venv ${VENV}
+
+curl https://bootstrap.pypa.io/get-pip.py | ${VENV}/bin/python
+${VENV}/bin/python -m pip install \
+ --requirement ${REPO_ROOT}/scripts/dev-requirements.txt
+
+# Create the wheel.
+DIST_WHEELS="${REPO_ROOT}/dist_wheels"
+mkdir -p ${DIST_WHEELS}
+cd ${REPO_ROOT}
+${VENV}/bin/python setup.py build_ext \
+ --include-dirs=${REPO_ROOT}/usr/include \
+ --library-dirs=${REPO_ROOT}/usr/lib \
+ --rpath=${REPO_ROOT}/usr/lib
+${VENV}/bin/python -m pip wheel ${REPO_ROOT} --wheel-dir ${DIST_WHEELS}
+
+# Delocate the wheel.
+FIXED_WHEELS="${REPO_ROOT}/wheels"
+mkdir -p ${FIXED_WHEELS}
+${VENV}/bin/delocate-wheel \
+ --wheel-dir ${FIXED_WHEELS} \
+ --verbose \
+ --check-archs \
+ ${DIST_WHEELS}/google_crc32c*${PY_TAG}*.whl
+
+if [[ "${PUBLISH_WHEELS}" == "true" ]]; then
+ . /${OSX_DIR}/publish_python_wheel.sh
+fi
+
+# test wheel
+${VENV}/bin/pip install \
+ --no-index --find-links=${REPO_ROOT}/wheels google-crc32c --force-reinstall
+${VENV}/bin/pip install pytest
+${VENV}/bin/py.test ${REPO_ROOT}/tests
+${VENV}/bin/python ${REPO_ROOT}/scripts/check_crc32c_extension.py
+
+ls ${REPO_ROOT}/wheels/
+
+# Clean up.
+rm -fr ${DIST_WHEELS}
+rm -fr ${VENV}
diff --git a/packages/google-crc32c/scripts/osx/publish_python_wheel.sh b/packages/google-crc32c/scripts/osx/publish_python_wheel.sh
new file mode 100755
index 000000000000..c5288eac09fc
--- /dev/null
+++ b/packages/google-crc32c/scripts/osx/publish_python_wheel.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eo pipefail
+
+if [ -z "$(pyenv versions --bare | grep 3.8)" ]; then
+ echo "Python 3.8 is not installed. Installing..."
+ pyenv install 3.8
+fi
+pyenv shell 3.8
+
+python -m pip install "setuptools<71"
+
+# Start the releasetool reporter
+python -m pip install --require-hashes -r ${REPO_ROOT}/.kokoro/requirements.txt
+python -m releasetool publish-reporter-script > /tmp/publisher-script; source /tmp/publisher-script
+
+ls ${REPO_ROOT}/wheels/
+# Disable logging
+set +x
+TWINE_PASSWORD=$(cat "${KOKORO_KEYSTORE_DIR}/73713_google-cloud-pypi-token-keystore-3")
+python -m twine upload --skip-existing --username __token__ --password "${TWINE_PASSWORD}" ${REPO_ROOT}/wheels/*
diff --git a/packages/google-crc32c/scripts/requirements.in b/packages/google-crc32c/scripts/requirements.in
new file mode 100644
index 000000000000..0508fa5e096b
--- /dev/null
+++ b/packages/google-crc32c/scripts/requirements.in
@@ -0,0 +1,4 @@
+setuptools
+pip
+wheel
+cmake
\ No newline at end of file
diff --git a/packages/google-crc32c/scripts/requirements.txt b/packages/google-crc32c/scripts/requirements.txt
new file mode 100644
index 000000000000..ca66848ed4f1
--- /dev/null
+++ b/packages/google-crc32c/scripts/requirements.txt
@@ -0,0 +1,41 @@
+#
+# This file is autogenerated by pip-compile with python 3.10
+# To update, run:
+#
+# pip-compile --allow-unsafe --generate-hashes requirements.in
+#
+cmake==3.31.6 \
+ --hash=sha256:024a79ca3d2c355f75875b6cc92d907afd710d1a4ffde2f20a7da712a2f4b1c3 \
+ --hash=sha256:112b36427e59bd26145b705a49d5f70b16433a655ce807cb8fdd81dd4d0e60c2 \
+ --hash=sha256:13f2e636dc27834fe096f53301d6efb913b4b501fdc0ed03f386c0a7e7ec1a21 \
+ --hash=sha256:1c8b05df0602365da91ee6a3336fe57525b137706c4ab5675498f662ae1dbcec \
+ --hash=sha256:2297e9591307d9c61e557efe737bcf4d7c13a30f1f860732f684a204fee24dca \
+ --hash=sha256:42d9883b8958da285d53d5f69d40d9650c2d1bcf922d82b3ebdceb2b3a7d4521 \
+ --hash=sha256:4326f6c6f39867a60e2822fea8e6aedbcac09c9f59ad3f0f3386a890a2c8d89d \
+ --hash=sha256:547efc1d0e27a194da819a0392fe645a9b8f1485bc2c3f34ae4f1e682cfd3153 \
+ --hash=sha256:689441fc74fbb03673c67e20d4636614a231634d5e803387cd213d2cdf9675fc \
+ --hash=sha256:6cb97adae7e5390ce68f8b7f38e1be1c72bf19e9f6727f31f8fa1c095b39be88 \
+ --hash=sha256:6f77db820af725bb92fab60c4c9d67f64442ac0ea9b933aca4cd4586219cbd1f \
+ --hash=sha256:8b67bf9613dfb59c12ce643c6be582c49c981e6eee28c4c244aeb3248b33f05e \
+ --hash=sha256:8edddfbf367fa1bcf4b9f3064470bc0e1022f70609c0cf69c863961897826205 \
+ --hash=sha256:9eed74a1f2a29a7cd92a9f071a35d64645b19802beb393ec250d6e7c09441314 \
+ --hash=sha256:9f170e3c6933dba64f333cb456823bbb1d0ac126f94aa4a577e40855d2b1ca49 \
+ --hash=sha256:bbaed969cef3c427f4f17591feb28db4ae595e3a4bbd45cb35522cee14df6a32 \
+ --hash=sha256:ce5fc0299ecafe489b2614daa6176c3c2baacea6bc3b359bac9aa25b46ed43e9 \
+ --hash=sha256:cefb910be81e1b4fdc3b89ef61819c3e848b3906ed56ac36d090f37cfa05666b \
+ --hash=sha256:da9d4fd9abd571fd016ddb27da0428b10277010b23bb21e3678f8b9e96e1686e
+ # via -r requirements.in
+wheel==0.45.1 \
+ --hash=sha256:661e1abd9198507b1409a20c02106d9670b2576e916d58f520316666abca6729 \
+ --hash=sha256:708e7481cc80179af0e556bbf0cc00b8444c7321e2700b8d8580231d13017248
+ # via -r requirements.in
+
+# The following packages are considered to be unsafe in a requirements file:
+pip==25.0.1 \
+ --hash=sha256:88f96547ea48b940a3a385494e181e29fb8637898f88d88737c5049780f196ea \
+ --hash=sha256:c46efd13b6aa8279f33f2864459c8ce587ea6a1a59ee20de055868d8f7688f7f
+ # via -r requirements.in
+setuptools==78.1.0 \
+ --hash=sha256:18fd474d4a82a5f83dac888df697af65afa82dec7323d09c3e37d1f14288da54 \
+ --hash=sha256:3e386e96793c8702ae83d17b853fb93d3e09ef82ec62722e61da5cd22376dcd8
+ # via -r requirements.in
diff --git a/packages/google-crc32c/scripts/windows/build.bat b/packages/google-crc32c/scripts/windows/build.bat
new file mode 100644
index 000000000000..c2b6b6fcb779
--- /dev/null
+++ b/packages/google-crc32c/scripts/windows/build.bat
@@ -0,0 +1,83 @@
+@rem Copyright 2019 Google LLC. All rights reserved.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+
+
+setlocal ENABLEDELAYEDEXPANSION
+
+set CMAKE_GENERATOR="Visual Studio 17 2022"
+set CONFIGURATION=RelWithDebInfo
+set CRC32C_INSTALL_PREFIX=%cd%\build\%CONFIGURATION%
+
+@rem Iterate through supported Python versions.
+@rem Unfortunately pyenv for Windows has an out-of-date versions list. Choco's
+@rem installer seems to have some problems with installing multiple versions at
+@rem once, so as a workaround, we will install and then uninstall every version.
+FOR %%P IN (3.9, 3.10, 3.11, 3.12, 3.13.1, 3.14.0) DO (
+
+ echo "Installing Python version %%P"
+ choco install python --version=%%P -y --no-progress
+
+ echo "Listing available Python versions'
+ py -0
+
+ set python_version=%%P
+ set python_version_trimmed=!python_version:~0,4!
+
+ py -!python_version_trimmed!-64 -m pip install --upgrade pip
+
+ echo "Installing cmake for Python %%P"
+ py -!python_version_trimmed!-64 -m pip install cmake
+
+ @rem Add directory as safe to avoid "detected dubious ownership" fatal issue
+ git config --global --add safe.directory %cd%
+ git config --global --add safe.directory C:/tmpfs/src/github/python-crc32c
+ git submodule update --init --recursive
+
+ git config --global --add safe.directory %cd%\google_crc32c
+ git config --global --add safe.directory C:/tmpfs/src/github/python-crc32c/google_crc32c
+ pushd google_crc32c
+ @rem reset hard to cleanup any changes done by a previous build.
+ git reset --hard
+ git clean -fxd
+
+ del /s /q CMakeFiles\
+ del CMakeCache.txt
+
+ mkdir build
+ cd build
+
+ echo "Running cmake with Generator: %CMAKE_GENERATOR%, Platform: x64, Install Prefix: %CRC32C_INSTALL_PREFIX%"
+
+ py -!python_version_trimmed!-64 -m cmake -G "Visual Studio 17 2022" -A x64 -DCMAKE_POLICY_VERSION_MINIMUM=3.12 -DCRC32C_BUILD_BENCHMARKS=no -DCRC32C_BUILD_TESTS=no -DBUILD_SHARED_LIBS=yes -DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=yes -DCRC32C_USE_GLOG=0 -DCMAKE_INSTALL_PREFIX:PATH=C:\tmpfs\src\github\python-crc32c\build\RelWithDebInfo ..
+
+ py -!python_version_trimmed!-64 -m cmake --build . --config "%CONFIGURATION%" --target install
+
+ dir %CRC32C_INSTALL_PREFIX% /b /s
+ popd
+
+ dir %CRC32C_INSTALL_PREFIX%\bin
+ echo "Copying Binary to root: %CRC32C_INSTALL_PREFIX%\bin\crc32c.dll"
+ copy %CRC32C_INSTALL_PREFIX%\bin\crc32c.dll .
+
+ py -!python_version_trimmed!-64 -m pip install --upgrade pip setuptools wheel
+ echo "Building C extension"
+ py -!python_version_trimmed!-64 setup.py build_ext -v --include-dirs=%CRC32C_INSTALL_PREFIX%\include --library-dirs=%CRC32C_INSTALL_PREFIX%\lib
+ echo "Building Wheel"
+ py -!python_version_trimmed!-64 -m pip wheel . --wheel-dir wheels/
+
+ echo "Built wheel, now running tests."
+ call %~dp0/test.bat !python_version_trimmed! || goto :error
+
+ echo "Finished with Python version %P"
+)
diff --git a/packages/google-crc32c/scripts/windows/test.bat b/packages/google-crc32c/scripts/windows/test.bat
new file mode 100644
index 000000000000..c7f28501d6bb
--- /dev/null
+++ b/packages/google-crc32c/scripts/windows/test.bat
@@ -0,0 +1,32 @@
+@rem Copyright 2019 Google LLC. All rights reserved.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+
+@rem This test file runs for one Python version at a time, and is intended to
+@rem be called from within the build loop.
+
+set PYTHON_VERSION=%1
+if "%PYTHON_VERSION%"=="" (
+ echo "Python version was not provided, using Python 3.10"
+ set PYTHON_VERSION=3.10
+)
+
+py -%PYTHON_VERSION%-64 -m pip install --no-index --find-links=wheels google-crc32c --force-reinstall
+
+py -%PYTHON_VERSION%-64 ./scripts/check_crc32c_extension.py
+
+@rem pyreadline is removed here because pytest will opportunistically use it if
+@rem available, but the installed version is too old to work.
+py -%PYTHON_VERSION%-64 -m pip uninstall -y pyreadline
+py -%PYTHON_VERSION%-64 -m pip install pytest
+py -%PYTHON_VERSION%-64 -m pytest tests
diff --git a/packages/google-crc32c/setup.cfg b/packages/google-crc32c/setup.cfg
new file mode 100644
index 000000000000..9e97011dd7ad
--- /dev/null
+++ b/packages/google-crc32c/setup.cfg
@@ -0,0 +1,49 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+[metadata]
+name = google-crc32c
+description = A python wrapper of the C library 'Google CRC32C'
+url = https://github.com/googleapis/python-crc32c
+long_description = file: README.md
+long_description_content_type = text/markdown
+author = Google LLC
+author_email = googleapis-packages@google.com
+
+license = Apache 2.0
+license_files = LICENSE
+platforms = Posix, MacOS X, Windows
+classifiers =
+ Development Status :: 4 - Beta
+ Intended Audience :: Developers
+ Operating System :: OS Independent
+ Programming Language :: Python :: 3
+ Programming Language :: Python :: 3.8
+ Programming Language :: Python :: 3.9
+ Programming Language :: Python :: 3.10
+ Programming Language :: Python :: 3.11
+ Programming Language :: Python :: 3.12
+ Programming Language :: Python :: 3.13
+ Programming Language :: Python :: 3.14
+
+[options]
+zip_safe = True
+python_requires = >=3.8
+
+[options.extras_require]
+testing = pytest
+
+[options.package_data]
+google_crc32c =
+ py.typed
diff --git a/packages/google-crc32c/setup.py b/packages/google-crc32c/setup.py
new file mode 100644
index 000000000000..cebbca973d22
--- /dev/null
+++ b/packages/google-crc32c/setup.py
@@ -0,0 +1,134 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+import os
+import platform
+import shutil
+
+import setuptools
+import setuptools.command.build_ext
+
+_EXTRA_DLL = "extra-dll"
+_DLL_FILENAME = "crc32c.dll"
+
+# Explicit environment variable disables pure-Python fallback
+CRC32C_PURE_PYTHON_EXPLICIT = "CRC32C_PURE_PYTHON" in os.environ
+_FALSE_OPTIONS = ("0", "false", "no", "False", "No", None)
+CRC32C_PURE_PYTHON = os.getenv("CRC32C_PURE_PYTHON") not in _FALSE_OPTIONS
+
+
+def copy_dll(build_lib):
+ install_prefix = os.environ.get("CRC32C_INSTALL_PREFIX")
+
+ if os.name == "nt" and install_prefix is not None:
+ assert os.path.isdir(install_prefix)
+
+ installed_dll = os.path.join(install_prefix, "bin", _DLL_FILENAME)
+ assert os.path.isfile(installed_dll)
+
+ lib_dlls = os.path.join(build_lib, "google_crc32c", _EXTRA_DLL)
+ os.makedirs(lib_dlls, exist_ok=True)
+ relocated_dll = os.path.join(lib_dlls, _DLL_FILENAME)
+
+ shutil.copyfile(installed_dll, relocated_dll)
+ assert os.path.isfile(relocated_dll)
+
+
+class BuildExtWithDLL(setuptools.command.build_ext.build_ext):
+ def run(self):
+ copy_dll(self.build_lib)
+ result = setuptools.command.build_ext.build_ext.run(self)
+ return result
+
+
+def build_pure_python():
+ setuptools.setup(
+ packages=["google_crc32c"],
+ package_dir={"": "src"},
+ ext_modules=[],
+ )
+
+
+def build_c_extension():
+ install_prefix = os.getenv("CRC32C_INSTALL_PREFIX")
+ if install_prefix is not None:
+ install_prefix = os.path.normcase(install_prefix)
+ print(f"#### using local install of 'crc32c': {install_prefix!r}")
+ # assert os.path.isdir(install_prefix)
+ install_prefix = os.path.realpath(install_prefix)
+ include_dirs = [os.path.join(install_prefix, "include")]
+ library_dirs = [os.path.join(install_prefix, "lib")]
+
+ if platform.system() == "Linux":
+ library_dirs.append(os.path.join(install_prefix, "lib64"))
+
+ if os.name == "nt":
+ library_dirs.append(os.path.join(install_prefix, "bin"))
+ kwargs = {
+ "include_dirs": include_dirs,
+ "library_dirs": library_dirs,
+ }
+ else:
+ runtime_library_dirs = library_dirs[:]
+ kwargs = {
+ "include_dirs": include_dirs,
+ "library_dirs": library_dirs,
+ "runtime_library_dirs": runtime_library_dirs,
+ }
+ else:
+ print("#### using global install of 'crc32c'")
+ kwargs = {}
+
+ module_path = os.path.join("src", "google_crc32c", "_crc32c.c")
+ sources = [os.path.normcase(module_path)]
+ print(f"##### sources: {sources}")
+ print(f"##### module kwargs: {kwargs}")
+ module = setuptools.Extension(
+ "google_crc32c._crc32c", sources=sources, libraries=["crc32c"], **kwargs
+ )
+
+ setuptools.setup(
+ packages=["google_crc32c"],
+ package_dir={"": "src"},
+ ext_modules=[module],
+ cmdclass={"build_ext": BuildExtWithDLL},
+ install_requires=[
+ "importlib_resources>=1.3 ; python_version < '3.9' and os_name == 'nt'"
+ ],
+ )
+
+
+if CRC32C_PURE_PYTHON:
+ build_pure_python()
+else:
+ try:
+ build_c_extension()
+ except SystemExit:
+ if CRC32C_PURE_PYTHON_EXPLICIT:
+ # If build / install fails, it is likely a compilation error with
+ # the C extension: advise user how to enable the pure-Python
+ # build.
+ logging.error(
+ "Compiling the C Extension for the crc32c library failed. "
+ "To enable building / installing a pure-Python-only version, "
+ "set 'CRC32C_PURE_PYTHON=1' in the environment."
+ )
+ raise
+
+ logging.info(
+ "Compiling the C Extension for the crc32c library failed. "
+ "Falling back to pure Python build."
+ )
+ build_pure_python()
diff --git a/packages/google-crc32c/src/google_crc32c/__config__.py b/packages/google-crc32c/src/google_crc32c/__config__.py
new file mode 100644
index 000000000000..536f0307e7f2
--- /dev/null
+++ b/packages/google-crc32c/src/google_crc32c/__config__.py
@@ -0,0 +1,39 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+
+
+def modify_path():
+ """Modify the module search path."""
+ # Only modify path on Windows.
+ if os.name != "nt":
+ return
+
+ path = os.environ.get("PATH")
+ if path is None:
+ return
+
+ try:
+ from importlib.resources import files as _resources_files
+
+ extra_dll_dir = str(_resources_files("google_crc32c") / "extra-dll")
+ if os.path.isdir(extra_dll_dir):
+ # Python 3.8+ uses add_dll_directory.
+ os.add_dll_directory(extra_dll_dir)
+ except ImportError:
+ pass
+
+
+modify_path()
diff --git a/packages/google-crc32c/src/google_crc32c/__init__.py b/packages/google-crc32c/src/google_crc32c/__init__.py
new file mode 100644
index 000000000000..bba10d5c4b1c
--- /dev/null
+++ b/packages/google-crc32c/src/google_crc32c/__init__.py
@@ -0,0 +1,39 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import warnings
+
+_SLOW_CRC32C_WARNING = (
+ "As the c extension couldn't be imported, `google-crc32c` is using a "
+ "pure python implementation that is significantly slower. If possible, "
+ "please configure a c build environment and compile the extension"
+)
+
+# Default to C exstension Implementation, falling back to pure python.
+try:
+ from google_crc32c import cext as impl
+
+ implementation = "c"
+except ImportError:
+ from google_crc32c import python as impl # type: ignore
+
+ warnings.warn(_SLOW_CRC32C_WARNING, RuntimeWarning)
+ implementation = "python"
+
+extend = impl.extend
+value = impl.value
+
+Checksum = impl.Checksum
+
+__all__ = ["extend", "value", "Checksum", "implementation"]
diff --git a/packages/google-crc32c/src/google_crc32c/_checksum.py b/packages/google-crc32c/src/google_crc32c/_checksum.py
new file mode 100644
index 000000000000..0aaf0854ce34
--- /dev/null
+++ b/packages/google-crc32c/src/google_crc32c/_checksum.py
@@ -0,0 +1,88 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import struct
+
+
+class CommonChecksum(object):
+ """Hashlib-alike helper for CRC32C operations.
+
+ This class should not be used directly and requires an update implementation.
+
+ Args:
+ initial_value (Optional[bytes]): the initial chunk of data from
+ which the CRC32C checksum is computed. Defaults to b''.
+ """
+
+ __slots__ = ()
+
+ def __init__(self, initial_value=b""):
+ self._crc = 0
+ if initial_value != b"":
+ self.update(initial_value)
+
+ def update(self, data):
+ """Update the checksum with a new chunk of data.
+
+ Args:
+ chunk (Optional[bytes]): a chunk of data used to extend
+ the CRC32C checksum.
+ """
+ raise NotImplementedError
+
+ def digest(self):
+ """Big-endian order, per RFC 4960.
+
+ See: https://cloud.google.com/storage/docs/json_api/v1/objects#crc32c
+
+ Returns:
+ bytes: An eight-byte digest string.
+ """
+ return struct.pack(">L", self._crc)
+
+ def hexdigest(self):
+ """Like :meth:`digest` except returns as a bytestring of double length.
+
+ Returns
+ bytes: A sixteen byte digest string, contaiing only hex digits.
+ """
+ return "{:08x}".format(self._crc).encode("ascii")
+
+ def copy(self):
+ """Create another checksum with the same CRC32C value.
+
+ Returns:
+ Checksum: the new instance.
+ """
+ clone = self.__class__()
+ clone._crc = self._crc
+ return clone
+
+ def consume(self, stream, chunksize):
+ """Consume chunks from a stream, extending our CRC32 checksum.
+
+ Args:
+ stream (BinaryIO): the stream to consume.
+ chunksize (int): the size of the read to perform
+
+ Returns:
+ Generator[bytes, None, None]: Iterable of the chunks read from the
+ stream.
+ """
+ while True:
+ chunk = stream.read(chunksize)
+ if not chunk:
+ break
+ self.update(chunk)
+ yield chunk
diff --git a/packages/google-crc32c/src/google_crc32c/_crc32c.c b/packages/google-crc32c/src/google_crc32c/_crc32c.c
new file mode 100644
index 000000000000..c84b8839376a
--- /dev/null
+++ b/packages/google-crc32c/src/google_crc32c/_crc32c.c
@@ -0,0 +1,62 @@
+#define PY_SSIZE_T_CLEAN
+#include
+#include
+
+
+static PyObject *
+_crc32c_extend(PyObject *self, PyObject *args)
+{
+ unsigned long crc_input;
+ uint32_t crc;
+ const char *chunk;
+ Py_ssize_t length;
+
+ if (!PyArg_ParseTuple(args, "ky#", &crc_input, &chunk, &length))
+ return NULL;
+
+ crc = crc32c_extend((uint32_t)crc_input, (const uint8_t*)chunk, length);
+
+ return PyLong_FromUnsignedLong(crc);
+}
+
+
+static PyObject *
+_crc32c_value(PyObject *self, PyObject *args)
+{
+ uint32_t crc;
+ const char *chunk;
+ Py_ssize_t length;
+
+ if (!PyArg_ParseTuple(args, "y#", &chunk, &length))
+ return NULL;
+
+ crc = crc32c_value((const uint8_t*)chunk, length);
+
+ return PyLong_FromUnsignedLong(crc);
+}
+
+
+static PyMethodDef Crc32cMethods[] = {
+ {"extend", _crc32c_extend, METH_VARARGS,
+ "Return an updated CRC32C checksum."},
+ {"value", _crc32c_value, METH_VARARGS,
+ "Return an initial CRC32C checksum."},
+ {NULL, NULL, 0, NULL} /* Sentinel */
+};
+
+
+static struct PyModuleDef crc32cmodule = {
+ PyModuleDef_HEAD_INIT,
+ "_crc32c", /* name of module */
+ NULL, /* module documentation, may be NULL */
+ -1, /* size of per-interpreter state of the module,
+ or -1 if the module keeps state in global variables. */
+ Crc32cMethods
+};
+
+
+PyMODINIT_FUNC
+PyInit__crc32c(void)
+{
+ return PyModule_Create(&crc32cmodule);
+}
diff --git a/packages/google-crc32c/src/google_crc32c/cext.py b/packages/google-crc32c/src/google_crc32c/cext.py
new file mode 100644
index 000000000000..1ace01c48106
--- /dev/null
+++ b/packages/google-crc32c/src/google_crc32c/cext.py
@@ -0,0 +1,43 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# NOTE: ``__config__`` **must** be the first import because it (may)
+# modify the search path used to locate shared libraries.
+import google_crc32c.__config__ # noqa: F401
+from google_crc32c._checksum import CommonChecksum
+from google_crc32c._crc32c import extend # type: ignore
+from google_crc32c._crc32c import value # type: ignore
+
+
+class Checksum(CommonChecksum):
+ """Hashlib-alike helper for CRC32C operations.
+
+ Args:
+ initial_value (Optional[bytes]): the initial chunk of data from
+ which the CRC32C checksum is computed. Defaults to b''.
+ """
+
+ __slots__ = ("_crc",)
+
+ def __init__(self, initial_value=b""):
+ self._crc = value(initial_value)
+
+ def update(self, chunk):
+ """Update the checksum with a new chunk of data.
+
+ Args:
+ chunk (Optional[bytes]): a chunk of data used to extend
+ the CRC32C checksum.
+ """
+ self._crc = extend(self._crc, chunk)
diff --git a/packages/google-crc32c/src/google_crc32c/py.typed b/packages/google-crc32c/src/google_crc32c/py.typed
new file mode 100644
index 000000000000..076325e24604
--- /dev/null
+++ b/packages/google-crc32c/src/google_crc32c/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# The google_crc32c package uses inline types.
diff --git a/packages/google-crc32c/src/google_crc32c/python.py b/packages/google-crc32c/src/google_crc32c/python.py
new file mode 100644
index 000000000000..04cedabffe26
--- /dev/null
+++ b/packages/google-crc32c/src/google_crc32c/python.py
@@ -0,0 +1,123 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import array
+
+from google_crc32c._checksum import CommonChecksum
+
+
+def extend(crc, chunk):
+ """Update an existing CRC checksum with new chunk of data.
+
+ Args
+ crc (int): An existing CRC check sum.
+ chunk (Union[bytes, List[int], Tuple[int]]): A new chunk of data.
+ Intended to be a byte string or similar.
+
+ Returns
+ int: New CRC checksum computed by extending existing CRC
+ with ``chunk``.
+ """
+ c = Checksum()
+ c._crc = crc
+ c.update(chunk)
+ return c._crc
+
+
+def value(chunk):
+ """Compute a CRC checksum for a chunk of data.
+
+ Args
+ chunk (Union[bytes, List[int], Tuple[int]]): A new chunk of data.
+ Intended to be a byte string or similar.
+
+ Returns
+ int: New CRC checksum computed for ``chunk``.
+ """
+ c = Checksum()
+ c.update(chunk)
+ return c._crc
+
+
+class Checksum(CommonChecksum):
+ """Hashlib-alike helper for CRC32C operations.
+
+ Args:
+ initial_value (Optional[bytes]): the initial chunk of data from
+ which the CRC32C checksum is computed. Defaults to b''.
+ """
+
+ def __init__(self, initial_value=b""):
+ self._crc = 0
+ if initial_value != b"":
+ self.update(initial_value)
+
+ def update(self, data):
+ """Update the checksum with a new chunk of data.
+
+ Args:
+ chunk (Optional[bytes]): a chunk of data used to extend
+ the CRC32C checksum.
+ """
+ if not isinstance(data, array.array) or data.itemsize != 1:
+ buffer = array.array("B", data)
+ else:
+ buffer = data
+ self._crc = self._crc ^ 0xFFFFFFFF
+ for b in buffer:
+ table_poly = _TABLE[(b ^ self._crc) & 0xFF]
+ self._crc = table_poly ^ ((self._crc >> 8) & 0xFFFFFFFF)
+ self._crc = self._crc ^ 0xFFFFFFFF
+
+
+# fmt:off
+_TABLE = [
+ 0x00000000, 0xf26b8303, 0xe13b70f7, 0x1350f3f4, 0xc79a971f, 0x35f1141c, 0x26a1e7e8,
+ 0xd4ca64eb, 0x8ad958cf, 0x78b2dbcc, 0x6be22838, 0x9989ab3b, 0x4d43cfd0, 0xbf284cd3,
+ 0xac78bf27, 0x5e133c24, 0x105ec76f, 0xe235446c, 0xf165b798, 0x30e349b, 0xd7c45070,
+ 0x25afd373, 0x36ff2087, 0xc494a384, 0x9a879fa0, 0x68ec1ca3, 0x7bbcef57, 0x89d76c54,
+ 0x5d1d08bf, 0xaf768bbc, 0xbc267848, 0x4e4dfb4b, 0x20bd8ede, 0xd2d60ddd, 0xc186fe29,
+ 0x33ed7d2a, 0xe72719c1, 0x154c9ac2, 0x61c6936, 0xf477ea35, 0xaa64d611, 0x580f5512,
+ 0x4b5fa6e6, 0xb93425e5, 0x6dfe410e, 0x9f95c20d, 0x8cc531f9, 0x7eaeb2fa, 0x30e349b1,
+ 0xc288cab2, 0xd1d83946, 0x23b3ba45, 0xf779deae, 0x5125dad, 0x1642ae59, 0xe4292d5a,
+ 0xba3a117e, 0x4851927d, 0x5b016189, 0xa96ae28a, 0x7da08661, 0x8fcb0562, 0x9c9bf696,
+ 0x6ef07595, 0x417b1dbc, 0xb3109ebf, 0xa0406d4b, 0x522bee48, 0x86e18aa3, 0x748a09a0,
+ 0x67dafa54, 0x95b17957, 0xcba24573, 0x39c9c670, 0x2a993584, 0xd8f2b687, 0xc38d26c,
+ 0xfe53516f, 0xed03a29b, 0x1f682198, 0x5125dad3, 0xa34e59d0, 0xb01eaa24, 0x42752927,
+ 0x96bf4dcc, 0x64d4cecf, 0x77843d3b, 0x85efbe38, 0xdbfc821c, 0x2997011f, 0x3ac7f2eb,
+ 0xc8ac71e8, 0x1c661503, 0xee0d9600, 0xfd5d65f4, 0xf36e6f7, 0x61c69362, 0x93ad1061,
+ 0x80fde395, 0x72966096, 0xa65c047d, 0x5437877e, 0x4767748a, 0xb50cf789, 0xeb1fcbad,
+ 0x197448ae, 0xa24bb5a, 0xf84f3859, 0x2c855cb2, 0xdeeedfb1, 0xcdbe2c45, 0x3fd5af46,
+ 0x7198540d, 0x83f3d70e, 0x90a324fa, 0x62c8a7f9, 0xb602c312, 0x44694011, 0x5739b3e5,
+ 0xa55230e6, 0xfb410cc2, 0x92a8fc1, 0x1a7a7c35, 0xe811ff36, 0x3cdb9bdd, 0xceb018de,
+ 0xdde0eb2a, 0x2f8b6829, 0x82f63b78, 0x709db87b, 0x63cd4b8f, 0x91a6c88c, 0x456cac67,
+ 0xb7072f64, 0xa457dc90, 0x563c5f93, 0x82f63b7, 0xfa44e0b4, 0xe9141340, 0x1b7f9043,
+ 0xcfb5f4a8, 0x3dde77ab, 0x2e8e845f, 0xdce5075c, 0x92a8fc17, 0x60c37f14, 0x73938ce0,
+ 0x81f80fe3, 0x55326b08, 0xa759e80b, 0xb4091bff, 0x466298fc, 0x1871a4d8, 0xea1a27db,
+ 0xf94ad42f, 0xb21572c, 0xdfeb33c7, 0x2d80b0c4, 0x3ed04330, 0xccbbc033, 0xa24bb5a6,
+ 0x502036a5, 0x4370c551, 0xb11b4652, 0x65d122b9, 0x97baa1ba, 0x84ea524e, 0x7681d14d,
+ 0x2892ed69, 0xdaf96e6a, 0xc9a99d9e, 0x3bc21e9d, 0xef087a76, 0x1d63f975, 0xe330a81,
+ 0xfc588982, 0xb21572c9, 0x407ef1ca, 0x532e023e, 0xa145813d, 0x758fe5d6, 0x87e466d5,
+ 0x94b49521, 0x66df1622, 0x38cc2a06, 0xcaa7a905, 0xd9f75af1, 0x2b9cd9f2, 0xff56bd19,
+ 0xd3d3e1a, 0x1e6dcdee, 0xec064eed, 0xc38d26c4, 0x31e6a5c7, 0x22b65633, 0xd0ddd530,
+ 0x417b1db, 0xf67c32d8, 0xe52cc12c, 0x1747422f, 0x49547e0b, 0xbb3ffd08, 0xa86f0efc,
+ 0x5a048dff, 0x8ecee914, 0x7ca56a17, 0x6ff599e3, 0x9d9e1ae0, 0xd3d3e1ab, 0x21b862a8,
+ 0x32e8915c, 0xc083125f, 0x144976b4, 0xe622f5b7, 0xf5720643, 0x7198540, 0x590ab964,
+ 0xab613a67, 0xb831c993, 0x4a5a4a90, 0x9e902e7b, 0x6cfbad78, 0x7fab5e8c, 0x8dc0dd8f,
+ 0xe330a81a, 0x115b2b19, 0x20bd8ed, 0xf0605bee, 0x24aa3f05, 0xd6c1bc06, 0xc5914ff2,
+ 0x37faccf1, 0x69e9f0d5, 0x9b8273d6, 0x88d28022, 0x7ab90321, 0xae7367ca, 0x5c18e4c9,
+ 0x4f48173d, 0xbd23943e, 0xf36e6f75, 0x105ec76, 0x12551f82, 0xe03e9c81, 0x34f4f86a,
+ 0xc69f7b69, 0xd5cf889d, 0x27a40b9e, 0x79b737ba, 0x8bdcb4b9, 0x988c474d, 0x6ae7c44e,
+ 0xbe2da0a5, 0x4c4623a6, 0x5f16d052, 0xad7d5351
+]
diff --git a/packages/google-crc32c/tests/test___init__.py b/packages/google-crc32c/tests/test___init__.py
new file mode 100644
index 000000000000..68bed918ffa4
--- /dev/null
+++ b/packages/google-crc32c/tests/test___init__.py
@@ -0,0 +1,289 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import functools
+import itertools
+from unittest import mock
+
+import pytest # type: ignore
+
+import google_crc32c
+
+EMPTY = b""
+EMPTY_CRC = 0x00000000
+
+# From: https://tools.ietf.org/html/rfc3720#appendix-B.4
+#
+# 32 bytes of zeroes:
+#
+# Byte: 0 1 2 3
+#
+# 0: 00 00 00 00
+# ...
+# 28: 00 00 00 00
+#
+# CRC: aa 36 91 8a
+
+ALL_ZEROS = b"\x00" * 32
+ALL_ZEROS_CRC = 0x8A9136AA
+
+# 32 bytes of ones:
+#
+# Byte: 0 1 2 3
+#
+# 0: ff ff ff ff
+# ...
+# 28: ff ff ff ff
+#
+# CRC: 43 ab a8 62
+
+ALL_ONES = b"\xff" * 32
+ALL_ONES_CRC = 0x62A8AB43
+
+#
+# 32 bytes of incrementing 00..1f:
+#
+# Byte: 0 1 2 3
+#
+# 0: 00 01 02 03
+# ...
+# 28: 1c 1d 1e 1f
+#
+# CRC: 4e 79 dd 46
+
+INCREMENTING = bytes(range(32))
+INCREMENTING_CRC = 0x46DD794E
+
+#
+# 32 bytes of decrementing 1f..00:
+#
+# Byte: 0 1 2 3
+#
+# 0: 1f 1e 1d 1c
+# ...
+# 28: 03 02 01 00
+#
+# CRC: 5c db 3f 11
+
+DECREMENTING = bytes(reversed(range(32)))
+DECREMENTING_CRC = 0x113FDB5C
+
+#
+# An iSCSI - SCSI Read (10) Command PDU
+#
+# Byte: 0 1 2 3
+#
+# 0: 01 c0 00 00
+# 4: 00 00 00 00
+# 8: 00 00 00 00
+# 12: 00 00 00 00
+# 16: 14 00 00 00
+# 20: 00 00 04 00
+# 24: 00 00 00 14
+# 28: 00 00 00 18
+# 32: 28 00 00 00
+# 36: 00 00 00 00
+# 40: 02 00 00 00
+# 44: 00 00 00 00
+#
+# CRC: 56 3a 96 d9
+
+ISCSI_SCSI_READ_10_COMMAND_PDU = [
+ 0x01,
+ 0xC0,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x14,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x04,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x14,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x18,
+ 0x28,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x02,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+]
+ISCSI_LENGTH = len(ISCSI_SCSI_READ_10_COMMAND_PDU)
+ISCSI_BYTES = bytes(ISCSI_SCSI_READ_10_COMMAND_PDU)
+ISCSI_CRC = 0xD9963A56
+
+
+def iscsi_chunks(chunksize):
+ for index in itertools.islice(range(ISCSI_LENGTH), 0, None, chunksize):
+ yield ISCSI_SCSI_READ_10_COMMAND_PDU[index : index + chunksize]
+
+
+_EXPECTED = [
+ (EMPTY, EMPTY_CRC),
+ (ALL_ZEROS, ALL_ZEROS_CRC),
+ (ALL_ONES, ALL_ONES_CRC),
+ (INCREMENTING, INCREMENTING_CRC),
+ (DECREMENTING, DECREMENTING_CRC),
+ (ISCSI_SCSI_READ_10_COMMAND_PDU, ISCSI_CRC),
+ (ISCSI_BYTES, ISCSI_CRC),
+]
+
+
+def test_extend_w_empty_chunk():
+ crc = 123
+ assert google_crc32c.extend(crc, b"") == crc
+
+
+def test_extend_w_multiple_chunks():
+ crc = 0
+
+ for chunk in iscsi_chunks(7):
+ chunk_bytes = bytes(chunk)
+ crc = google_crc32c.extend(crc, chunk_bytes)
+
+ assert crc == ISCSI_CRC
+
+
+def test_extend_w_reduce():
+ chunks = [bytes(chunk) for chunk in iscsi_chunks(3)]
+ assert functools.reduce(google_crc32c.extend, chunks, 0) == ISCSI_CRC
+
+
+@pytest.mark.parametrize("chunk, expected", _EXPECTED)
+def test_value(chunk, expected):
+ assert google_crc32c.value(bytes(chunk)) == expected
+
+
+def pytest_generate_tests(metafunc):
+ if "_crc32c" in metafunc.fixturenames:
+ metafunc.parametrize("_crc32c", ["python", "cext"], indirect=True)
+
+
+@pytest.fixture
+def _crc32c(request):
+ if request.param == "python":
+ from google_crc32c import python
+
+ return python
+ elif request.param == "cext":
+ from google_crc32c import cext
+
+ return cext
+ else:
+ raise ValueError("invalid internal test config")
+
+
+class TestChecksum(object):
+ @staticmethod
+ def test_ctor_defaults(_crc32c):
+ helper = google_crc32c.Checksum()
+ assert helper._crc == 0
+
+ @staticmethod
+ def test_ctor_explicit(_crc32c):
+ chunk = b"DEADBEEF"
+ helper = google_crc32c.Checksum(chunk)
+ assert helper._crc == google_crc32c.value(chunk)
+
+ @staticmethod
+ def test_update(_crc32c):
+ chunk = b"DEADBEEF"
+ helper = google_crc32c.Checksum()
+ helper.update(chunk)
+ assert helper._crc == google_crc32c.value(chunk)
+
+ @staticmethod
+ def test_update_w_multiple_chunks(_crc32c):
+ helper = google_crc32c.Checksum()
+
+ for index in itertools.islice(range(ISCSI_LENGTH), 0, None, 7):
+ chunk = ISCSI_SCSI_READ_10_COMMAND_PDU[index : index + 7]
+ helper.update(bytes(chunk))
+
+ assert helper._crc == ISCSI_CRC
+
+ @staticmethod
+ def test_digest_zero(_crc32c):
+ helper = google_crc32c.Checksum()
+ assert helper.digest() == b"\x00" * 4
+
+ @staticmethod
+ def test_digest_nonzero(_crc32c):
+ helper = google_crc32c.Checksum()
+ helper._crc = 0x01020304
+ assert helper.digest() == b"\x01\x02\x03\x04"
+
+ @staticmethod
+ def test_hexdigest_zero(_crc32c):
+ helper = google_crc32c.Checksum()
+ assert helper.hexdigest() == b"00" * 4
+
+ @staticmethod
+ def test_hexdigest_nonzero(_crc32c):
+ helper = google_crc32c.Checksum()
+ helper._crc = 0x091A3B2C
+ assert helper.hexdigest() == b"091a3b2c"
+
+ @staticmethod
+ def test_copy(_crc32c):
+ chunk = b"DEADBEEF"
+ helper = google_crc32c.Checksum(chunk)
+ clone = helper.copy()
+ before = helper._crc
+ helper.update(b"FACEDACE")
+ assert clone._crc == before
+
+ @staticmethod
+ @pytest.mark.parametrize("chunksize", [1, 3, 5, 7, 11, 13, ISCSI_LENGTH])
+ def test_consume_stream(_crc32c, chunksize):
+ helper = google_crc32c.Checksum()
+ expected = [bytes(chunk) for chunk in iscsi_chunks(chunksize)]
+ stream = mock.Mock(spec=["read"])
+ stream.read.side_effect = expected + [b""]
+
+ found = list(helper.consume(stream, chunksize))
+
+ assert helper._crc == ISCSI_CRC
+ assert found == expected
+ for call in stream.read.call_args_list:
+ assert call == mock.call(chunksize)
diff --git a/scripts/split_repo_migration/single-library.git-migrate-history.sh b/scripts/split_repo_migration/single-library.git-migrate-history.sh
index 9f926e1d030e..650abac5ca26 100755
--- a/scripts/split_repo_migration/single-library.git-migrate-history.sh
+++ b/scripts/split_repo_migration/single-library.git-migrate-history.sh
@@ -70,7 +70,7 @@ echo "Created working directory: ${WORKDIR}"
pushd "${WORKDIR}" # cd into workdir
echo "Cloning source repository: ${SOURCE_REPO}"
-git clone --recurse-submodules "git@github.com:${SOURCE_REPO}.git" source-repo
+git clone --recurse-submodules --recurse-submodules "git@github.com:${SOURCE_REPO}.git" source-repo
pushd source-repo
@@ -124,7 +124,7 @@ git filter-branch \
--force \
--prune-empty \
--tree-filter \
- "git submodule update --init --recursive; find . -mindepth 2 -name .git -exec rm -rf {} +; shopt -s dotglob; mkdir -p ${WORKDIR}/migrated-source; mv * ${WORKDIR}/migrated-source; mkdir -p ${TARGET_PATH}; { mv ${WORKDIR}/migrated-source/* ${TARGET_PATH} || echo 'No files to move' ; }"
+ "git submodule update --init --recursive; find . -mindepth 2 -name .git -exec rm -rf {} +; git submodule update --init --recursive; find . -mindepth 2 -name .git -exec rm -rf {} +; shopt -s dotglob; mkdir -p ${WORKDIR}/migrated-source; mv * ${WORKDIR}/migrated-source; mkdir -p ${TARGET_PATH}; { mv ${WORKDIR}/migrated-source/* ${TARGET_PATH} || echo 'No files to move' ; }"
# back to workdir
popd
@@ -142,7 +142,7 @@ echo "Success"
popd # back to workdir
# Do a diff between source code split repo and migrated code.
-git clone --recurse-submodules "git@github.com:${SOURCE_REPO}.git" source-repo-validation # Not ideal to clone again.
+git clone --recurse-submodules --recurse-submodules "git@github.com:${SOURCE_REPO}.git" source-repo-validation # Not ideal to clone again.
find source-repo-validation -name .git -exec rm -rf {} + # That folder is not needed for validation.
DIFF_FILE="${WORKDIR}/diff.txt"