Core/PacketIO: Use std::string_view to read strings from ByteBuffer

src/server/game/Server/Packets/PacketUtilities.cpp

@@ -20,37 +20,37 @@
 #include "StringFormat.h"
 #include <utf8.h>
 
-WorldPackets::InvalidStringValueException::InvalidStringValueException(std::string const& value) : ByteBufferInvalidValueException("string", value.c_str())
+WorldPackets::InvalidStringValueException::InvalidStringValueException(std::string_view value) : ByteBufferInvalidValueException("string", value), _value(value)
 {
 }
 
-WorldPackets::InvalidUtf8ValueException::InvalidUtf8ValueException(std::string const& value) : InvalidStringValueException(value)
+WorldPackets::InvalidUtf8ValueException::InvalidUtf8ValueException(std::string_view value) : InvalidStringValueException(value)
 {
 }
 
-WorldPackets::InvalidHyperlinkException::InvalidHyperlinkException(std::string const& value) : InvalidStringValueException(value)
+WorldPackets::InvalidHyperlinkException::InvalidHyperlinkException(std::string_view value) : InvalidStringValueException(value)
 {
 }
 
-WorldPackets::IllegalHyperlinkException::IllegalHyperlinkException(std::string const& value) : InvalidStringValueException(value)
+WorldPackets::IllegalHyperlinkException::IllegalHyperlinkException(std::string_view value) : InvalidStringValueException(value)
 {
 }
 
-bool WorldPackets::Strings::Utf8::Validate(std::string const& value)
+bool WorldPackets::Strings::Utf8::Validate(std::string_view value)
 {
     if (!utf8::is_valid(value.begin(), value.end()))
         throw InvalidUtf8ValueException(value);
     return true;
 }
 
-bool WorldPackets::Strings::Hyperlinks::Validate(std::string const& value)
+bool WorldPackets::Strings::Hyperlinks::Validate(std::string_view value)
 {
     if (!Trinity::Hyperlinks::CheckAllLinks(value))
         throw InvalidHyperlinkException(value);
     return true;
 }
 
-bool WorldPackets::Strings::NoHyperlinks::Validate(std::string const& value)
+bool WorldPackets::Strings::NoHyperlinks::Validate(std::string_view value)
 {
     if (value.find('|') != std::string::npos)
         throw IllegalHyperlinkException(value);

src/server/game/Server/Packets/PacketUtilities.h

@@ -31,7 +31,7 @@ namespace WorldPackets
     class InvalidStringValueException : public ByteBufferInvalidValueException
     {
     public:
-        InvalidStringValueException(std::string const& value);
+        InvalidStringValueException(std::string_view value);
 
         std::string const& GetInvalidValue() const { return _value; }
 
@@ -42,29 +42,29 @@ namespace WorldPackets
     class InvalidUtf8ValueException : public InvalidStringValueException
     {
     public:
-        InvalidUtf8ValueException(std::string const& value);
+        InvalidUtf8ValueException(std::string_view value);
     };
 
     class InvalidHyperlinkException : public InvalidStringValueException
     {
     public:
-        InvalidHyperlinkException(std::string const& value);
+        InvalidHyperlinkException(std::string_view value);
     };
 
     class IllegalHyperlinkException : public InvalidStringValueException
     {
     public:
-        IllegalHyperlinkException(std::string const& value);
+        IllegalHyperlinkException(std::string_view value);
     };
 
     namespace Strings
     {
-        struct RawBytes { static bool Validate(std::string const& /*value*/) { return true; } };
+        struct RawBytes { static bool Validate(std::string_view /*value*/) { return true; } };
         template<std::size_t MaxBytesWithoutNullTerminator>
-        struct ByteSize { static bool Validate(std::string const& value) { return value.size() <= MaxBytesWithoutNullTerminator; } };
-        struct Utf8 { static bool Validate(std::string const& value); };
-        struct Hyperlinks { static bool Validate(std::string const& value); };
-        struct NoHyperlinks { static bool Validate(std::string const& value); };
+        struct ByteSize { static bool Validate(std::string_view value) { return value.size() <= MaxBytesWithoutNullTerminator; } };
+        struct Utf8 { static bool Validate(std::string_view value); };
+        struct Hyperlinks { static bool Validate(std::string_view value); };
+        struct NoHyperlinks { static bool Validate(std::string_view value); };
     }
 
     /**
@@ -90,9 +90,7 @@ namespace WorldPackets
 
         friend ByteBuffer& operator>>(ByteBuffer& data, String& value)
         {
-            std::string string = data.ReadCString(false);
-            Validate(string);
-            value._storage = std::move(string);
+            value = data.ReadCString(false);
             return data;
         }
 
@@ -110,14 +108,26 @@ namespace WorldPackets
             return *this;
         }
 
+        String& operator=(std::string_view value)
+        {
+            Validate(value);
+            _storage = std::move(value);
+            return *this;
+        }
+
+        String& operator=(char const* value)
+        {
+            return *this = std::string_view(value);
+        }
+
     private:
-        static bool Validate(std::string const& value)
+        static bool Validate(std::string_view value)
         {
             return ValidateNth(value, std::make_index_sequence<std::tuple_size_v<ValidatorList>>{});
         }
 
         template<std::size_t... indexes>
-        static bool ValidateNth(std::string const& value, std::index_sequence<indexes...>)
+        static bool ValidateNth(std::string_view value, std::index_sequence<indexes...>)
         {
             return (std::tuple_element_t<indexes, ValidatorList>::Validate(value) && ...);
         }

src/server/shared/Packets/ByteBuffer.cpp

@@ -21,6 +21,7 @@
 #include "Log.h"
 #include "Util.h"
 #include <utf8.h>
+#include <algorithm>
 #include <sstream>
 #include <cmath>
 
@@ -33,7 +34,7 @@ ByteBufferPositionException::ByteBufferPositionException(size_t pos, size_t size
 {
 }
 
-ByteBufferInvalidValueException::ByteBufferInvalidValueException(char const* type, char const* value)
+ByteBufferInvalidValueException::ByteBufferInvalidValueException(char const* type, std::string_view value)
     : ByteBufferException(Trinity::StringFormat("Invalid {} value ({}) found in ByteBuffer", type, value))
 {
 }
@@ -54,34 +55,39 @@ ByteBuffer& ByteBuffer::operator>>(double& value)
     return *this;
 }
 
-std::string ByteBuffer::ReadCString(bool requireValidUtf8 /*= true*/)
+std::string_view ByteBuffer::ReadCString(bool requireValidUtf8 /*= true*/)
 {
-    std::string value;
-    while (rpos() < size())                         // prevent crash at wrong string format in packet
-    {
-        char c = read<char>();
-        if (c == 0)
-            break;
-        value += c;
-    }
+    if (_rpos >= size())
+        throw ByteBufferPositionException(_rpos, 1, size());
+
+    ResetBitPos();
+
+    char const* begin = reinterpret_cast<char const*>(_storage.data()) + _rpos;
+    char const* end = reinterpret_cast<char const*>(_storage.data()) + size();
+    char const* stringEnd = std::ranges::find(begin, end, '\0');
+    if (stringEnd == end)
+        throw ByteBufferPositionException(size(), 1, size());
+
+    std::string_view value(begin, stringEnd);
+    _rpos += value.length() + 1;
     if (requireValidUtf8 && !utf8::is_valid(value.begin(), value.end()))
-        throw ByteBufferInvalidValueException("string", value.c_str());
+        throw ByteBufferInvalidValueException("string", value);
     return value;
 }
 
-std::string ByteBuffer::ReadString(uint32 length, bool requireValidUtf8 /*= true*/)
+std::string_view ByteBuffer::ReadString(uint32 length, bool requireValidUtf8 /*= true*/)
 {
     if (_rpos + length > size())
         throw ByteBufferPositionException(_rpos, length, size());
 
     ResetBitPos();
     if (!length)
-        return std::string();
+        return {};
 
-    std::string value(reinterpret_cast<char const*>(&_storage[_rpos]), length);
+    std::string_view value(reinterpret_cast<char const*>(&_storage[_rpos]), length);
     _rpos += length;
     if (requireValidUtf8 && !utf8::is_valid(value.begin(), value.end()))
-        throw ByteBufferInvalidValueException("string", value.c_str());
+        throw ByteBufferInvalidValueException("string", value);
     return value;
 }
 

src/server/shared/Packets/ByteBuffer.h

@@ -49,7 +49,7 @@ public:
 class TC_SHARED_API ByteBufferInvalidValueException : public ByteBufferException
 {
 public:
-    ByteBufferInvalidValueException(char const* type, char const* value);
+    ByteBufferInvalidValueException(char const* type, std::string_view value);
 };
 
 class TC_SHARED_API ByteBuffer
@@ -509,9 +509,9 @@ class TC_SHARED_API ByteBuffer
                 append(str, len);
         }
 
-        std::string ReadCString(bool requireValidUtf8 = true);
+        std::string_view ReadCString(bool requireValidUtf8 = true);
 
-        std::string ReadString(uint32 length, bool requireValidUtf8 = true);
+        std::string_view ReadString(uint32 length, bool requireValidUtf8 = true);
 
         uint8* contents()
         {