Method writeData

c++/src/Compression.cc:127–144

write the data content into outputBuffer

  // write the data content into outputBuffer
  void CompressionStreamBase::writeData(const unsigned char* data, int size) {
    int offset = 0;
    while (offset < size) {
      if (outputPosition == outputSize) {
        if (!BufferedOutputStream::Next(reinterpret_cast<void**>(&outputBuffer), &outputSize)) {
          throw CompressionError("Failed to get next output buffer from output stream.");
        }
        outputPosition = 0;
      } else if (outputPosition > outputSize) {
        // for safety this will unlikely happen
        throw CompressionError("Write to an out-of-bound place during compression!");
      }
      int currentSize = std::min(outputSize - outputPosition, size - offset);
      memcpy(outputBuffer + outputPosition, data + offset, static_cast<size_t>(currentSize));
      offset += currentSize;
      outputPosition += currentSize;
    }
  }

  void CompressionStreamBase::ensureHeader() {
    // adjust 3 bytes for the compression header