add chatWriteImage

apps/ios/SimpleXChat/CryptoFile.swift

@@ -25,6 +25,18 @@ public func writeCryptoFile(path: String, data: Data) throws -> CryptoFileArgs {
     }
 }
 
+public func writeCryptoImage(maxSize: Int, path: String, data: Data, encrypted: Bool) throws -> CryptoFileArgs {
+    let ptr: UnsafeMutableRawPointer = malloc(data.count)
+    memcpy(ptr, (data as NSData).bytes, data.count)
+    var cPath = path.cString(using: .utf8)!
+    let cjson = chat_write_image(getChatCtrl(), maxSize, &cPath, ptr, Int32(data.count), encrypted)!
+    let d = fromCString(cjson).data(using: .utf8)!
+    switch try jsonDecoder.decode(WriteFileResult.self, from: d) {
+    case let .result(cfArgs): return cfArgs
+    case let .error(err): throw RuntimeError(err)
+    }
+}
+
 public func readCryptoFile(path: String, cryptoArgs: CryptoFileArgs) throws -> Data {
     var cPath = path.cString(using: .utf8)!
     var cKey = cryptoArgs.fileKey.cString(using: .utf8)!

apps/ios/SimpleXChat/FileUtils.swift

@@ -223,6 +223,17 @@ public func saveFile(_ data: Data, _ fileName: String, encrypted: Bool) -> Crypt
     }
 }
 
+public func saveImage(_ data: Data, _ fileName: String, maxSize: Long, encrypted: Bool) -> CryptoFile? {
+    let filePath = getAppFilePath(fileName)
+    do {
+        let cfArgs = try writeCryptoImage(maxSize: maxSize, path: filePath.path, data: data, encrypted: encrypted)
+        return CryptoFile(filePath: fileName, cryptoArgs: cfArgs)
+    } catch {
+        logger.error("FileUtils.saveImage error: \(error.localizedDescription)")
+        return nil
+    }
+}
+
 public func removeFile(_ url: URL) {
     do {
         try FileManager.default.removeItem(atPath: url.path)

apps/ios/SimpleXChat/SimpleX.h

@@ -35,7 +35,7 @@ extern char *chat_resize_image_to_str_size(const char *path, long maxSize);
 extern char *chat_write_file(chat_ctrl ctl, char *path, char *data, int len);
 
 // chat_write_image returns null-terminated string with JSON of WriteFileResult
-extern char *chat_write_image(chat_ctrl ctl, long maxSize, char *path, char *data, int len);
+extern char *chat_write_image(chat_ctrl ctl, long maxSize, char *path, char *data, int len, bool encrypted);
 
 // chat_read_file returns a buffer with:
 // result status (1 byte), then if