Fix crash when trying to read/write a string with 0 length

include/Athena/IStreamReader.hpp

@@ -883,6 +883,9 @@ public:
      */
     inline std::string readWStringAsString(atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return std::string();
+
         std::string retval;
         atUint16 chr = readUint16();
 
@@ -921,6 +924,9 @@ public:
      */
     inline std::string readWStringAsStringLittle(atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return std::string();
+
         std::string retval;
         atUint16 chr = readUint16Little();
 
@@ -959,6 +965,9 @@ public:
      */
     inline std::string readWStringAsStringBig(atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return std::string();
+
         std::string retval;
         atUint16 chr = readUint16Big();
 
@@ -996,6 +1005,8 @@ public:
      */
     inline std::string readString(atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return std::string();
         std::string ret;
         atUint8 chr = readByte();
 
@@ -1026,6 +1037,9 @@ public:
      */
     inline std::wstring readWString(atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return std::wstring();
+
         std::wstring ret;
         atUint16 chr = readUint16();
 
@@ -1057,6 +1071,9 @@ public:
      */
     inline std::wstring readWStringLittle(atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return std::wstring();
+
         std::wstring ret;
         atUint16 chr = readUint16Little();
 
@@ -1088,6 +1105,8 @@ public:
      */
     inline std::wstring readWStringBig(atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return std::wstring();
         std::wstring ret;
         atUint16 chr = readUint16Big();
 

include/Athena/IStreamWriter.hpp

@@ -712,6 +712,8 @@ public:
      */
     inline void writeStringAsWString(const std::string& str, atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return;
         std::string tmpStr = "\xEF\xBB\xBF" + str;
         const utf8proc_uint8_t* buf = reinterpret_cast<const utf8proc_uint8_t*>(tmpStr.c_str());
         if (fixedLen < 0)
@@ -768,6 +770,8 @@ public:
      */
     inline void writeStringAsWStringLittle(const std::string& str, atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return;
         std::string tmpStr = "\xEF\xBB\xBF" + str;
         const utf8proc_uint8_t* buf = reinterpret_cast<const utf8proc_uint8_t*>(tmpStr.c_str());
         if (fixedLen < 0)
@@ -824,6 +828,9 @@ public:
      */
     inline void writeStringAsWStringBig(const std::string& str, atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return;
+
         std::string tmpStr = "\xEF\xBB\xBF" + str;
         const utf8proc_uint8_t* buf = reinterpret_cast<const utf8proc_uint8_t*>(tmpStr.c_str());
         if (fixedLen < 0)
@@ -877,6 +884,9 @@ public:
      */
     inline void writeString(const std::string& str, atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return;
+
         if (fixedLen < 0)
         {
             for (atUint8 c : str)
@@ -913,6 +923,9 @@ public:
      */
     inline void writeWString(const std::wstring& str, atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return;
+
         if (fixedLen < 0)
         {
             for (atUint16 c : str)
@@ -949,6 +962,9 @@ public:
      */
     inline void writeWStringLittle(const std::wstring& str, atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return;
+
         if (fixedLen < 0)
         {
             for (atUint16 c : str)
@@ -985,6 +1001,9 @@ public:
      */
     inline void writeWStringBig(const std::wstring& str, atInt32 fixedLen = -1)
     {
+        if (fixedLen == 0)
+            return;
+
         if (fixedLen < 0)
         {
             for (atUint16 c : str)