Add PDF encryption support: pdf_save_encrypted with RC4 40-bit encryption

.github/workflows/build_and_test.yml

@@ -35,6 +35,7 @@ jobs:
           name: pdfgen-main-artifacts
           path: |
             output.pdf
+            output_encrypted.pdf
             pdfgen.h
             pdfgen.o
             doc/html/
@@ -56,6 +57,7 @@ jobs:
         cp testprog.exe testprog-64.exe
         testprog-64
         cp output.pdf output-win64.pdf
+        cp output_encrypted.pdf output_encrypted-win64.pdf
     - name: make x86
       shell: cmd
       run: |
@@ -65,13 +67,16 @@ jobs:
         cp testprog.exe testprog-32.exe
         testprog-32
         cp output.pdf output-win32.pdf
+        cp output_encrypted.pdf output_encrypted-win32.pdf
     - name: Upload artifacts
       uses: actions/upload-artifact@v4
       with:
         name: pdfgen-win32-artifacts
         path: |
           output-win32.pdf
           output-win64.pdf
+          output_encrypted-win32.pdf
+          output_encrypted-win64.pdf
           testprog-32.exe
           testprog-64.exe
 
@@ -80,4 +85,17 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: make
-      run: make
+      run: |
+        make
+        make testprog
+        ./testprog
+        cp output.pdf output-macos.pdf
+        cp output_encrypted.pdf output_encrypted-macos.pdf
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: pdfgen-macos-artifacts
+        path: |
+          output-macos.pdf
+          output_encrypted-macos.pdf
+          testprog

.gitignore

@@ -13,3 +13,5 @@ docs/html
 docs/latex
 doxygen.log
 tests/massive-file
+output_encrypted.pdf
+output_encrypted.txt

Makefile

@@ -107,5 +107,5 @@ podman-shell: podman-image
 .PHONY: default check coverage example-check fuzz-check format docs podman-image podman-build-win32 podman-infer podman-build podman-test podman-check podman-fuzz-check podman-docs podman-coverage podman-shell clean
 
 clean:
-	rm -f *$(O_SUFFIX) tests/*$(O_SUFFIX) $(TESTPROG) *.gcda *.gcno *.gcov tests/*.gcda tests/*.gcno output.pdf output.txt tests/fuzz-header tests/fuzz-text tests/fuzz-image-data tests/fuzz-image-file test/massive-file output.pdftk fuzz-image-file.pdf fuzz-image-data.pdf fuzz-image.dat doxygen.log tests/penguin.c fuzz.pdf output.ps output.ppm output-barcodes.txt
+	rm -f *$(O_SUFFIX) tests/*$(O_SUFFIX) $(TESTPROG) *.gcda *.gcno *.gcov tests/*.gcda tests/*.gcno output.pdf output_encrypted.pdf output.txt tests/fuzz-header tests/fuzz-text tests/fuzz-image-data tests/fuzz-image-file test/massive-file output.pdftk fuzz-image-file.pdf fuzz-image-data.pdf fuzz-image.dat doxygen.log tests/penguin.c fuzz.pdf output.ps output.ppm output-barcodes.txt
 	rm -rf docs/html docs/latex fuzz-artifacts infer-out coverage-html