Collaboration diagram for MemoryStream::Chunk:

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Public Member Functions
size_t	Append (StreamChunk &dataView)

Public Attributes
std::array< uint8_t, ChunkSize >	Data

size_t	BytesUsed { 0 }

Detailed Description

Definition at line 42 of file lib-utility/memorystream.h.

Member Function Documentation

◆ Append()

size_t MemoryStream::Chunk::Append ( StreamChunk & dataView )

Definition at line 67 of file lib-utility/memorystream.cpp.

{
   const size_t dataSize = dataView.second;
 
   const size_t bytesToWrite = std::min(ChunkSize - BytesUsed, dataSize);
   const size_t bytesLeft = dataSize - bytesToWrite;
 
   const uint8_t* beginData = static_cast<const uint8_t*>(dataView.first);
   const uint8_t* endData = beginData + bytesToWrite;
 
   // Some extreme micro optimization for MSVC (at least)
   // std::copy will generate a call to memmove in any case
   // which will be slower than just writing the byte
   if (bytesToWrite == 1)
   {
      Data[BytesUsed] = *beginData;
   }
   else
   {
      // There is a chance for unaligned access, so we do no handle
      // types as int32_t separately. Unaligned access is slow on x86
      // and fails horribly on ARM
      std::copy(beginData, endData, Data.begin() + BytesUsed);
   }
 
   dataView.first = endData;
   dataView.second = bytesLeft;
 
   BytesUsed += bytesToWrite;
 
   return bytesLeft;
}

References BytesUsed, MemoryStream::ChunkSize, staffpad::vo::copy(), Data, and min().

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Member Data Documentation

◆ BytesUsed

size_t MemoryStream::Chunk::BytesUsed { 0 }

Definition at line 45 of file lib-utility/memorystream.h.

Referenced by Append().

◆ Data

std::array<uint8_t, ChunkSize> MemoryStream::Chunk::Data

Definition at line 44 of file lib-utility/memorystream.h.