add pngcheck

aperisolve/analyzers/pngcheck.py

@@ -0,0 +1,40 @@
+"""Pngcheck Analyzer for Image Submissions."""
+
+import subprocess
+from pathlib import Path
+
+from .utils import MAX_PENDING_TIME, update_data
+
+
+def analyze_pngcheck(input_img: Path, output_dir: Path) -> None:
+    """Analyze an image submission using strings."""
+
+    try:
+        data = subprocess.run(
+            ["pngcheck", "-v",input_img],
+            capture_output=True,
+            text=True,
+            check=False,
+            timeout=MAX_PENDING_TIME,
+        )
+        # Error based on https://github.com/pnggroup/pngcheck/issues/59
+        # if data.stderr:
+        #     update_data(
+        #         output_dir, {"pngcheck": {"status": "error", "error": data.stderr}}
+        #     )
+        #     return
+
+        data_strings = data.stdout.split("\n") if data else []
+        data_strings = [s for s in data_strings if s]
+
+        update_data(
+            output_dir,
+            {
+                "pngcheck": {
+                    "status": "ok",
+                    "output": data_strings,
+                }
+            },
+        )
+    except Exception as e:
+        update_data(output_dir, {"pngcheck": {"status": "error", "error": str(e)}})