Add zstd to CI tests

Author: davidalo

.github/workflows/test.yaml

@@ -67,6 +67,7 @@ jobs:
           sudo apt-get install -y libc6-dev${{ matrix.config.arch_suffix }} libstdc++-13-dev${{ matrix.config.arch_suffix }} \
             libssl-dev${{ matrix.config.arch_suffix }} libcurl4-openssl-dev${{ matrix.config.arch_suffix }} \
             zlib1g-dev${{ matrix.config.arch_suffix }} libbrotli-dev${{ matrix.config.arch_suffix }}
+            libzstd-dev${{ matrix.config.arch_suffix }}
       - name: build and run tests
         run: cd test && make EXTRA_CXXFLAGS="${{ matrix.config.arch_flags }}"
       - name: run fuzz test target
@@ -126,7 +127,7 @@ jobs:
     - name: Setup msbuild on windows
       uses: microsoft/setup-msbuild@v2
     - name: Install vcpkg dependencies
-      run: vcpkg install gtest curl zlib brotli
+      run: vcpkg install gtest curl zlib brotli zstd
     - name: Install OpenSSL
       if: ${{ matrix.config.with_ssl }}
       run: choco install openssl
@@ -139,6 +140,7 @@ jobs:
         -DHTTPLIB_COMPILE=${{ matrix.config.compiled && 'ON' || 'OFF' }}
         -DHTTPLIB_REQUIRE_ZLIB=ON
         -DHTTPLIB_REQUIRE_BROTLI=ON
+        -DHTTPLIB_REQUIRE_ZSTD=ON
         -DHTTPLIB_REQUIRE_OPENSSL=${{ matrix.config.with_ssl && 'ON' || 'OFF' }}
     - name: Build ${{ matrix.config.name }}
       run: cmake --build build --config Release -- /v:m /clp:ShowCommandLine

test/Makefile

@@ -18,7 +18,9 @@ ZLIB_SUPPORT = -DCPPHTTPLIB_ZLIB_SUPPORT -lz
 BROTLI_DIR = $(PREFIX)/opt/brotli
 BROTLI_SUPPORT = -DCPPHTTPLIB_BROTLI_SUPPORT -I$(BROTLI_DIR)/include -L$(BROTLI_DIR)/lib -lbrotlicommon -lbrotlienc -lbrotlidec
 
-TEST_ARGS = gtest/src/gtest-all.cc gtest/src/gtest_main.cc -Igtest -Igtest/include $(OPENSSL_SUPPORT) $(ZLIB_SUPPORT) $(BROTLI_SUPPORT) -pthread -lcurl
+ZSTD_SUPPORT = -DCPPHTTPLIB_ZSTD_SUPPORT -lzstd
+
+TEST_ARGS = gtest/src/gtest-all.cc gtest/src/gtest_main.cc -Igtest -Igtest/include $(OPENSSL_SUPPORT) $(ZLIB_SUPPORT) $(BROTLI_SUPPORT) $(ZSTD_SUPPORT) -pthread -lcurl
 
 # By default, use standalone_fuzz_target_runner.
 # This runner does no fuzzing, but simply executes the inputs