Reject empty inputs before multi-frame decompression #2724

	on:
	push:
	branches-ignore:
	- 'dependabot/**'
	pull_request:
	schedule:
	- cron: '30 13 * * *'
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true
	permissions: { }
	jobs:
	linux:
	runs-on: 'ubuntu-24.04'
	env:
	# Make all compile warnings fatal.
	ZSTD_WARNINGS_AS_ERRORS: '1'
	# Activate Python development mode so we get warnings.
	PYTHONDEVMODE: '1'

	steps:
	- name: System Setup
	run: \|
	sudo apt-get install -y libzstd1 libzstd-dev python3-cffi

	- name: Set up Python
	uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
	with:
	python-version: '3.10'

	- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
	with:
	persist-credentials: false

	- name: Build
	run: \|
	python -m pip install --config-settings=--global-option=--system-zstd .

	macOS:
	runs-on: 'macos-26'
	env:
	# Make all compile warnings fatal.
	ZSTD_WARNINGS_AS_ERRORS: '1'
	# Activate Python development mode so we get warnings.
	PYTHONDEVMODE: '1'

	steps:
	- name: Set up Python
	uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
	with:
	python-version: '3.10'

	- name: System Setup
	run: \|
	brew install -v zstd
	python -m pip install cffi

	- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
	with:
	persist-credentials: false

	- name: Build
	run: \|
	python -m pip install --config-settings=--global-option=--system-zstd .

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