refactor(native-player): share player helpers

linux/runner/mpv/mpv_player.cc

@@ -11,49 +11,8 @@
 #include <gdk/gdkwayland.h>
 #endif
 #include <clocale>
-#include <cstring>
-#include <string>
-#include <simdutf.h>
 
-// Sanitize a C string that may contain invalid UTF-8 sequences.
-// Uses simdutf for SIMD-accelerated validation (fast path for valid strings),
-// then falls back to iterative replacement with U+FFFD on the rare invalid case.
-// mpv does not guarantee UTF-8 for log messages, error strings, or
-// system-encoded paths — sending these unsanitized through Flutter's
-// StandardMessageCodec causes FormatException crashes.
-static std::string SanitizeUtf8(const char* input) {
-  if (!input) return std::string();
-  size_t len = strlen(input);
-  if (len == 0) return std::string();
-
-  // Fast path: SIMD-accelerated validation — almost all strings pass this
-  if (simdutf::validate_utf8(input, len)) {
-    return std::string(input, len);
-  }
-
-  // Slow path: find each invalid position, copy valid prefix, insert U+FFFD,
-  // skip the bad byte, and repeat.
-  std::string result;
-  result.reserve(len);
-  size_t pos = 0;
-
-  while (pos < len) {
-    auto r = simdutf::validate_utf8_with_errors(input + pos, len - pos);
-    // Copy the valid prefix up to the error
-    if (r.count > 0) {
-      result.append(input + pos, r.count);
-    }
-    pos += r.count;
-    if (r.error == simdutf::error_code::SUCCESS) {
-      break;  // remaining tail is valid
-    }
-    // Replace the invalid byte with U+FFFD and skip it
-    result.append("\xEF\xBF\xBD");
-    pos++;
-  }
-
-  return result;
-}
+#include "sanitize_utf8.h"
 
 // Flutter on Linux uses EGL (OpenGL ES) for both X11 and Wayland.
 static void* get_opengl_proc_address(void* ctx, const char* name) {