Initial import

PdbFind.Lib/Locator.cs

@@ -0,0 +1,48 @@
+using PeNet;
+
+namespace PdbFind.Lib
+{
+    public class Locator
+    {
+        public static (string? pdbName, string? checksum) GetPdbChecksum(string path)
+        {
+            if (!File.Exists(path))
+            {
+                throw new FileNotFoundException("PE File not found", path);
+            }
+
+            var peFile = new PeFile(path);
+
+            var pdb70 = peFile.ImageDebugDirectory?.Where(d => d.CvInfoPdb70 != null).Select(d => d.CvInfoPdb70).FirstOrDefault();
+
+            var pdbName = (pdb70?.PdbFileName != null) ? Path.GetFileName(pdb70.PdbFileName) : null;
+
+            var checksum = pdb70?.Signature != null ? $"{pdb70.Signature:N}{pdb70.Age}" : null;
+
+            return (pdbName, checksum);
+        }
+
+        public static string LocatePdbInStore(string path, string store)
+        {
+            if (!Directory.Exists(store))
+            {
+                throw new DirectoryNotFoundException($"Directory \"{store}\" not found.");
+            }
+
+            var (pdbName, checksum) = GetPdbChecksum(path);
+
+            _ = pdbName ?? throw new InvalidOperationException("PDB name not found in PE header.");
+            _ = checksum ?? throw new InvalidOperationException("Checksum not found in PE header.");
+
+            var isIndex2 = File.Exists(Path.Combine(store, "index2.txt"));
+
+            var pdbPath = Path.Combine(pdbName, checksum, pdbName);
+            if (isIndex2)
+            {
+                pdbPath = Path.Combine(pdbName.Substring(0, 2), pdbName, checksum, pdbName);
+            }
+
+            return Path.Combine(store, pdbPath);
+        }
+    }
+}