nsCRT::memcpy(aBuf, mBuffer+mIndex, readCount);
memcpy(aBuf, mBuffer+mIndex, readCount);
  NS_IMETHOD Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount) {      PRUint32 readCount = PR_MIN(aCount, (mSize-mIndex));            nsCRT::memcpy(aBuf, mBuffer+mIndex, readCount);      mIndex += readCount;      *aReadCount = readCount;      return NS_OK;  }