Add unicode filename test

And fix errors in MUTF-8 conversion in jni.cpp

1 files changed, 24 insertions, 19 deletions

diff --git a/libs/samba/src/main/cpp/jni.cpp b/libs/samba/src/main/cpp/jni.cpp
index b7bbd1a..d3336ac 100644
--- a/libs/samba/src/main/cpp/jni.cpp
+++ b/libs/samba/src/main/cpp/jni.cpp
@@ -36,25 +36,26 @@ const char *_jni_error(jint err) {
 
 const char* u8_read(const char* str, uint32_t& out) {
   // Assume valid UTF-8 for speed and so it can be used to read modified utf-8 as well
-  switch (*str >> 4) {
+  auto* const d = reinterpret_cast<const uint8_t*>(str);
+  switch (d[0] >> 4) {
     case 0xf: // 4 byte
-      out = (static_cast<uint32_t>(str[0] & 0x7) << 18) |
-            (static_cast<uint32_t>(str[1] & 0x3f) << 12) |
-            (static_cast<uint32_t>(str[2] & 0x3f) << 6) |
-            static_cast<uint8_t>(str[3] & 0x3f);
+      out = (static_cast<uint32_t>(d[0] & 0x7) << 18) |
+            (static_cast<uint32_t>(d[1] & 0x3f) << 12) |
+            (static_cast<uint32_t>(d[2] & 0x3f) << 6) |
+            static_cast<uint8_t>(d[3] & 0x3f);
       return str + 4;
     case 0xe: // 3 byte
-      out = (static_cast<uint32_t>(str[0] & 0xf) << 12) |
-            (static_cast<uint32_t>(str[1] & 0x3f) << 6) |
-            static_cast<uint8_t>(str[2] & 0x3f);
+      out = (static_cast<uint32_t>(d[0] & 0xf) << 12) |
+            (static_cast<uint32_t>(d[1] & 0x3f) << 6) |
+            static_cast<uint8_t>(d[2] & 0x3f);
       return str + 3;
     case 0xd:
     case 0xc: // 2 byte
-      out = (static_cast<uint32_t>(str[0] & 0x1f) << 6) |
-          static_cast<uint8_t>(str[1] & 0x3f);
+      out = (static_cast<uint32_t>(d[0] & 0x1f) << 6) |
+          static_cast<uint8_t>(d[1] & 0x3f);
       return str + 2;
     default: // 1 byte
-      out = static_cast<uint8_t>(str[0]);
+      out = static_cast<uint8_t>(d[0]);
       return str + 1;
   }
 }
@@ -77,16 +78,17 @@ void u8_write(std::string& ret, uint32_t c) {
   }
 }
 
-std::string MakeModifiedUTF8(const char* str, const char* ptr, uint32_t c) {
+std::string MakeModifiedUTF8(const char* str, const char* prev, const char* ptr, uint32_t c) {
   std::string ret;
   while (true) {
-    ret.append(str, ptr - str);
+    ret.append(str, prev - str);
     str = ptr;
     u8_write(ret, 0xd800 + ((c & 0xffff) >> 10));
     u8_write(ret, 0xdc00 + (c & 0x3ff));
     if (!*ptr) break;
     do {
-      ptr = u8_read(ptr, c);
+      prev = ptr;
+      ptr = u8_read(prev, c);
       if (c > 0xffff)
         break;
     } while (*ptr);
@@ -98,15 +100,17 @@ std::optional<std::string> MakeModifiedUTF8IfNeeded(const char* str) {
   auto* ptr = str;
   while (*ptr) {
     uint32_t c;
-    ptr = u8_read(ptr, c);
+    auto* next = u8_read(ptr, c);
     if (c > 0xffff) {
-      return MakeModifiedUTF8(str, ptr, c);
+      return MakeModifiedUTF8(str, ptr, next, c);
     }
+    ptr = next;
   }
   return std::nullopt;
 }
 
-const char* splice(std::string& str, const char* start, const char* end, const char* insert, size_t size) {
+const char* splice(std::string& str, const char* start, const char* end,
+                   const char* insert, size_t size) {
   auto pos = start - str.c_str();
   str.replace(pos, end - start, insert, size);
   return str.c_str() + pos + size;
@@ -229,8 +233,9 @@ LocalRef<jthrowable> ExceptionOccurred(JNIEnv* env) {
 
 std::string StringToUTF8(JNIEnv* env, const Ref<jstring>& str) {
   if (!str) return "null";
-  auto len = env->GetStringUTFLength(str.get());
-  std::string ret(len, ' ');
+  auto size = env->GetStringUTFLength(str.get());
+  auto len = env->GetStringLength(str.get());
+  std::string ret(size, ' ');
   env->GetStringUTFRegion(str.get(), 0, len, ret.data());
   UnmodifyUTF8(ret);
   return ret;