also run a compression fuzzer

Author: folkertdev

.github/workflows/checks.yaml

@@ -254,13 +254,20 @@ jobs:
             RUST_BACKTRACE=1 cargo fuzz run --no-default-features --features="$features" $target -- -max_total_time=10
           done
 
-  fuzz-decompression:
-    name: Fuzz decompression with a custom corpus
+  fuzz-code-coverage:
+    name: Fuzz with code coverage 
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        features:
-          - 'default'
+        include:
+          - fuzz_target: uncompress2
+            corpus: "gzip-files/compressed"
+            features: '--no-default-features --features="disable-checksum"'
+            flags: fuzz-decompress
+          - fuzz_target: compress
+            corpus: ""
+            features: ''
+            flags: fuzz-compress
     steps:
       - name: Checkout sources
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
@@ -275,30 +282,33 @@ jobs:
         uses: taiki-e/install-action@56ab7930c591507f833cbaed864d201386d518a8
         with:
           tool: cargo-fuzz,rustfilt
-      - name: Fuzz decompression with custom corpus
-        env:
-          RUST_BACKTRACE: "1"
+      - name: Download custom decompression corpus
+        if: ${{ contains(matrix.corpus, 'gzip-files') }}
         run: |
           ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-cov show --help
           wget https://github.com/folkertdev/compression-corpus/releases/download/2025-04-09-154431/gzip-files.zip
           unzip gzip-files.zip -d gzip-files
-          cargo fuzz run --no-default-features --features="disable-checksum" uncompress2 gzip-files/compressed -- -max_total_time=10
+      - name: Run `cargo fuzz`
+        env:
+          RUST_BACKTRACE: "1"
+        run: |
+          cargo fuzz run ${{matrix.features}} ${{matrix.fuzz_target}} ${{matrix.corpus}} -- -max_total_time=10
       - name: Fuzz codecov
         run: |
-          cargo fuzz coverage --no-default-features --features="disable-checksum" uncompress2 gzip-files/compressed
+          cargo fuzz coverage ${{matrix.features}} ${{matrix.fuzz_target}} ${{matrix.corpus}}
           ~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-cov export -Xdemangler=rustfilt \
-              target/x86_64-unknown-linux-gnu/coverage/x86_64-unknown-linux-gnu/release/uncompress2 \
-              -instr-profile=fuzz/coverage/uncompress2/coverage.profdata \
+              target/x86_64-unknown-linux-gnu/coverage/x86_64-unknown-linux-gnu/release/${{matrix.fuzz_target}} \
+              -instr-profile=fuzz/coverage/${{matrix.fuzz_target}}/coverage.profdata \
               --format=lcov \
               -ignore-filename-regex="\.cargo|\.rustup" > lcov.info
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@eaaf4bedf32dbdc6b720b63067d99c4d77d6047d
         with:
           files: ./lcov.info
           fail_ci_if_error: false
-          flags: fuzz-decompress
+          flags: ${{ matrix.flags }}
           token: ${{ secrets.CODECOV_TOKEN }}
-          name: fuzz 
+          name: fuzz
 
   link-c-dynamic-library:
     name: vanilla dynamic library