fix cursor visibility in OSX

src/binary_stream.cpp

@@ -115,10 +115,13 @@ std::wstring BinaryStreamReader::rwstring(size_t len)
     //    std::swap(ptr[i * 2], ptr[i * 2 + 1]);
 
     // right trim trailing zeroes
-    auto wptr = (uint16_t*)ptr;
-    for (int i = len - 1; i >= 0; i--)
-        if (wptr[i] == 0) len--;
-
+    if (len > 0)
+    {
+        auto wptr = (uint16_t*)ptr;
+        for (size_t i = len - 1; i >= 0 && len > 0; i--)
+            if (wptr[i] == 0) len--;
+    }
+    
     // wide to UTF-16le
     std::wstring_convert<std::codecvt_utf16<wchar_t, 0x10ffff>> converter;
     return converter.from_bytes(ptr, ptr + len * 2);
@@ -257,7 +260,7 @@ void BinaryStreamWriter::wdbl(double v)
 
 void BinaryStreamWriter::wstring(std::string s)
 {
-    wu32(s.size());
+    wu32((int)s.size());
     write(s.data(), s.size());
 }
 
@@ -268,7 +271,7 @@ void BinaryStreamWriter::wstring_raw(std::string s)
 
 void BinaryStreamWriter::wwstring(std::wstring s)
 {
-    wu32(s.size());
+    wu32((int)s.size());
     std::wstring_convert<std::codecvt_utf16<wchar_t, 0x10ffff>> converter;
     wstring_raw(converter.to_bytes(s));
 }
@@ -287,13 +290,13 @@ void BinaryStreamWriter::wpascal(std::string s)
 
 void BinaryStreamWriter::wraw(std::vector<uint8_t> raw)
 {
-    wu32(raw.size());
+    wu32((int)raw.size());
     write(raw.data(), raw.size());
 }
 
 void BinaryStreamWriter::wrle(std::vector<uint8_t> data)
 {
-    int idx = 0;
+    size_t idx = 0;
     auto ptr = data.data();
 
     // find the next sequence and return the position