+Fixed issue #74 by defaulting to permission 644 if no permissions or invalid permissions are set

+Also added test case to verify resolution with a zip file created on WinRAR for Windows

Zip.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		303B4F6E1E4CBE5000DC1633 /* permissions.zip in Resources */ = {isa = PBXBuildFile; fileRef = 303B4F6D1E4CBE5000DC1633 /* permissions.zip */; };
+		305237181E64595700CA46D1 /* unsupported_permissions.zip in Resources */ = {isa = PBXBuildFile; fileRef = 305237171E64595700CA46D1 /* unsupported_permissions.zip */; };
 		342545901CE525B200336074 /* Zip.swift in Sources */ = {isa = PBXBuildFile; fileRef = 347E3AD71C1E04C900A11FD3 /* Zip.swift */; };
 		342545921CE525B200336074 /* unzip.c in Sources */ = {isa = PBXBuildFile; fileRef = 342FC0EB1C5044DC0023A3C3 /* unzip.c */; };
 		342545941CE525B200336074 /* QuickZip.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3443A3F51C4AB8A3004AD173 /* QuickZip.swift */; };
@@ -71,6 +72,7 @@
 
 /* Begin PBXFileReference section */
 		303B4F6D1E4CBE5000DC1633 /* permissions.zip */ = {isa = PBXFileReference; lastKnownFileType = archive.zip; path = permissions.zip; sourceTree = "<group>"; };
+		305237171E64595700CA46D1 /* unsupported_permissions.zip */ = {isa = PBXFileReference; lastKnownFileType = archive.zip; path = unsupported_permissions.zip; sourceTree = "<group>"; };
 		342545B51CE525B200336074 /* Zip.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Zip.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		342FC0E71C5044DC0023A3C3 /* crypt.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = crypt.h; sourceTree = "<group>"; };
 		342FC0E81C5044DC0023A3C3 /* ioapi.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = ioapi.c; sourceTree = "<group>"; };
@@ -196,6 +198,7 @@
 		347E3A821C1DFFB500A11FD3 /* ZipTests */ = {
 			isa = PBXGroup;
 			children = (
+				305237171E64595700CA46D1 /* unsupported_permissions.zip */,
 				303B4F6D1E4CBE5000DC1633 /* permissions.zip */,
 				34940A221C58876200D41574 /* 3crBXeO.gif */,
 				34940A231C58876200D41574 /* kYkLkPf.gif */,
@@ -418,6 +421,7 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				305237181E64595700CA46D1 /* unsupported_permissions.zip in Resources */,
 				303B4F6E1E4CBE5000DC1633 /* permissions.zip in Resources */,
 				34940A251C58876200D41574 /* kYkLkPf.gif in Resources */,
 				3443A3FD1C4AD199004AD173 /* bb8.zip in Resources */,

Zip/Zip.swift

@@ -199,11 +199,16 @@ public class Zip {
             }
 
             //Set file permissions from current fileInfo
-            let permissions = (fileInfo.external_fa >> 16) & 0x1FF
-            do {
-                try fileManager.setAttributes([.posixPermissions : permissions], ofItemAtPath: fullPath)
-            } catch let error {
-                print("Failed to set permissions to file \(fullPath)")
+            if fileInfo.external_fa != 0 {
+                let permissions = (fileInfo.external_fa >> 16) & 0x1FF
+                //We will devifne a valid permission range between Owner read only to full access
+                if permissions >= 0o400 && permissions <= 0o777 {
+                    do {
+                        try fileManager.setAttributes([.posixPermissions : permissions], ofItemAtPath: fullPath)
+                    } catch {
+                        print("Failed to set permissions to file \(fullPath), error: \(error)")
+                    }
+                }
             }
 
             ret = unzGoToNextFile(zip)

ZipTests/ZipTests.swift

@@ -217,6 +217,24 @@ class ZipTests: XCTestCase {
         }
     }
 
+    func testUnzipWithUnsupportedPermissions() {
+        do {
+            let permissionsURL = Bundle(for: ZipTests.self).url(forResource: "unsupported_permissions", withExtension: "zip")!
+            let unzipDestination = try Zip.quickUnzipFile(permissionsURL)
+            print(unzipDestination)
+            let fileManager = FileManager.default
+            let permission644 = unzipDestination.appendingPathComponent("unsupported_permission").appendingPathExtension("txt")
+            do {
+                let attributes644 = try fileManager.attributesOfItem(atPath: permission644.path)
+                XCTAssertEqual(attributes644[.posixPermissions] as? Int, 0o644)
+            } catch {
+                XCTFail("Failed to get file attributes \(error)")
+            }
+        } catch {
+            XCTFail("Failed extract unsupported_permissions.zip")
+        }
+    }
+
     func testUnzipPermissions() {
         do {
             let permissionsURL = Bundle(for: ZipTests.self).url(forResource: "permissions", withExtension: "zip")!