Added support for temp and caches dir on Android.

ChangeLog

@@ -7,6 +7,17 @@
 
 	* NSTimeZones/NSTimeZones.tar: updated to latest info
 
+2019-11-05  Frederik Seiffert <frederik@algoriddim.com>
+
+	* Headers/Foundation/NSProcessInfo.h:
+	* Source/NSPathUtilities.m:
+	* Source/NSProcessInfo.m:
+	Added support for NSTemporaryDirectory() on Android using subfolder
+	in folder returned by Context.getCacheDir(), as there is no official
+	temp dir prior to API level 26. Clean up temp dir on launch in
+	GSInitializeProcessAndroid(). Also use Context.getCacheDir()
+	as NSCachesDirectory (with NSUserDomainMask) on Android.
+
 2019-10-27  Fred Kiefer <fredkiefer@gmx.de>
 
 	* Headers/Foundation/NSUnit.h,

Headers/Foundation/NSProcessInfo.h

@@ -273,6 +273,7 @@ DEFINE_BLOCK_TYPE(GSPerformExpiringActivityBlock, void, BOOL);
 #ifdef __ANDROID__
 - (jobject) androidContext;
 - (NSString *) androidFilesDir;
+- (NSString *) androidCacheDir;
 #endif
 
 @end

Source/NSPathUtilities.m

@@ -1950,9 +1950,7 @@ NSTemporaryDirectory(void)
   int		perm;
   int		owner;
   BOOL		flag;
-#if	!defined(_WIN32)
-  int		uid;
-#else
+#if defined(_WIN32)
   unichar buffer[1024];
 
   if (GetTempPathW(1024, buffer))
@@ -1960,6 +1958,20 @@ NSTemporaryDirectory(void)
       baseTempDirName = [NSString stringWithCharacters: buffer
 						length: wcslen(buffer)];
     }
+#elif defined(__ANDROID__)
+  /*
+   * Use subfolder of cache directory as temp dir on Android, as there
+   * is no official temp dir prior to API level 26, and the cache dir
+   * is at least auto-purged by the system if disk space is needed.
+   * We also clean it up on launch in GSInitializeProcessAndroid().
+   */
+  NSString *cacheDir = [[NSProcessInfo processInfo] androidCacheDir];
+  if (cacheDir)
+    {
+      baseTempDirName = [cacheDir stringByAppendingPathComponent: @"tmp"];
+    }
+#else
+  int		uid;
 #endif
 
   /*
@@ -2004,10 +2016,31 @@ NSTemporaryDirectory(void)
   if ([manager fileExistsAtPath: tempDirName isDirectory: &flag] == NO
     || flag == NO)
     {
+#ifdef __ANDROID__
+      /*
+       * Create our own temp dir on Android. We can disregard attributes
+       * since they are not supported.
+       */
+      if ([manager createDirectoryAtPath: tempDirName
+             withIntermediateDirectories: YES
+                              attributes: nil
+                                   error: NULL] == NO)
+        {
+          NSWarnFLog(@"Attempt to create temporary directory (%@)"
+            @" failed.", tempDirName);
+          return nil;
+        }
+#else
       NSWarnFLog(@"Temporary directory (%@) does not exist", tempDirName);
       return nil;
+#endif
     }
 
+// Mateu Batle: secure temporary directories don't work in MinGW
+// Ivan Vucica: there are also problems with Cygwin
+//              probable cause: http://stackoverflow.com/q/9561759/39974
+#if !defined(_WIN32) && !defined(__CYGWIN__) && !defined(__ANDROID__)
+
   /*
    * Check that we are the directory owner, and that we, and nobody else,
    * have access to it. If other people have access, try to create a secure
@@ -2018,20 +2051,11 @@ NSTemporaryDirectory(void)
   perm = [[attr objectForKey: NSFilePosixPermissions] intValue];
   perm = perm & 0777;
 
-// Mateu Batle: secure temporary directories don't work in MinGW
-// Ivan Vucica: there are also problems with Cygwin
-//              probable cause: http://stackoverflow.com/q/9561759/39974
-#if !defined(_WIN32) && !defined(__CYGWIN__)
-
-#if	defined(_WIN32)
-  uid = owner;
-#else
 #ifdef HAVE_GETEUID
   uid = geteuid();
 #else
   uid = getuid();
 #endif /* HAVE_GETEUID */
-#endif
   if ((perm != 0700 && perm != 0600) || owner != uid)
     {
       NSString	*secure;
@@ -2472,12 +2496,17 @@ L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\GNUstep",
 
       case NSCachesDirectory:
 	{
+#ifdef __ANDROID__
+	  /* Use system-provided cache directory on Android */
+	  ADD_PATH(NSUserDomainMask, [[NSProcessInfo processInfo] androidCacheDir], @"");
+#else
 	  /* Uff - at the moment the only place to put Caches seems to
 	   * be Library.  Unfortunately under GNU/Linux Library will
 	   * end up in /usr/lib/GNUstep which could be mounted
 	   * read-only!
 	   */
 	  ADD_PATH(NSUserDomainMask, gnustepUserLibrary, @"Caches");
+#endif
 	  ADD_PATH(NSLocalDomainMask, gnustepLocalLibrary, @"Caches");
 	  ADD_PATH(NSNetworkDomainMask, gnustepNetworkLibrary, @"Caches");
 	  ADD_PATH(NSSystemDomainMask, gnustepSystemLibrary, @"Caches");

Source/NSProcessInfo.m

@@ -234,6 +234,7 @@ static NSMutableSet	*mySet = nil;
 #ifdef __ANDROID__
 static jobject _androidContext = NULL;
 static NSString *_androidFilesDir = nil;
+static NSString *_androidCacheDir = nil;
 #endif
 
 /*************************************************************************
@@ -1607,21 +1608,36 @@ GSInitializeProcessAndroid(JNIEnv *env, jobject context)
 
   free(arg0);
 
+  // get File class and path method
+  jclass fileCls = (*env)->FindClass(env, "java/io/File");
+  jmethodID getAbsolutePathMethod = (*env)->GetMethodID(env, fileCls, "getAbsolutePath", "()Ljava/lang/String;");
+
   // get Android files dir
   jmethodID filesDirMethod = (*env)->GetMethodID(env, cls, "getFilesDir", "()Ljava/io/File;");
   jobject filesDirObj = (*env)->CallObjectMethod(env, context, filesDirMethod);
-  jclass filesDirCls = (*env)->GetObjectClass(env, filesDirObj);
-  jmethodID getStoragePath = (*env)->GetMethodID(env, filesDirCls, "getAbsolutePath", "()Ljava/lang/String;");
-  jstring filesDirJava = (*env)->CallObjectMethod(env, filesDirObj, getStoragePath);
-	const jchar *unichars = (*env)->GetStringChars(env, filesDirJava, NULL);
-  jsize length = (*env)->GetStringLength(env, filesDirJava);
-  _androidFilesDir = [NSString stringWithCharacters:unichars length:length];
-  (*env)->ReleaseStringChars(env, filesDirJava, unichars);
+  jstring filesDirJava = (*env)->CallObjectMethod(env, filesDirObj, getAbsolutePathMethod);
+	const jchar *filesDirUnichars = (*env)->GetStringChars(env, filesDirJava, NULL);
+  jsize filesDirLength = (*env)->GetStringLength(env, filesDirJava);
+  _androidFilesDir = [NSString stringWithCharacters:filesDirUnichars length:filesDirLength];
+  (*env)->ReleaseStringChars(env, filesDirJava, filesDirUnichars);
+
+  // get Android cache dir
+  jmethodID cacheDirMethod = (*env)->GetMethodID(env, cls, "getCacheDir", "()Ljava/io/File;");
+  jobject cacheDirObj = (*env)->CallObjectMethod(env, context, cacheDirMethod);
+  jstring cacheDirJava = (*env)->CallObjectMethod(env, cacheDirObj, getAbsolutePathMethod);
+	const jchar *cacheDirUnichars = (*env)->GetStringChars(env, cacheDirJava, NULL);
+  jsize cacheDirLength = (*env)->GetStringLength(env, cacheDirJava);
+  _androidCacheDir = [NSString stringWithCharacters:cacheDirUnichars length:cacheDirLength];
+  (*env)->ReleaseStringChars(env, cacheDirJava, cacheDirUnichars);
 
   // get asset manager and initialize NSBundle
   jmethodID assetManagerMethod = (*env)->GetMethodID(env, cls, "getAssets", "()Landroid/content/res/AssetManager;");
   jstring assetManagerJava = (*env)->CallObjectMethod(env, context, assetManagerMethod);
   [NSBundle setJavaAssetManager:assetManagerJava withJNIEnv:env];
+
+  // clean up our NSTemporaryDirectory() if it exists
+  NSString *tempDirName = [_androidCacheDir stringByAppendingPathComponent: @"tmp"];
+  [[NSFileManager defaultManager] removeItemAtPath:tempDirName error:NULL];
 }
 #endif
 
@@ -1667,6 +1683,11 @@ GSInitializeProcessAndroid(JNIEnv *env, jobject context)
 {
   return _androidFilesDir;
 }
+
+- (NSString *) androidCacheDir
+{
+  return _androidCacheDir;
+}
 #endif
 
 @end