nsCRT::memcpy(aBuf, mBuffer, amt);
memcpy(aBuf, mBuffer, amt);
    NS_IMETHOD Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount) {        PRUint32 amt = PR_MIN(aCount, mLength);        if (amt > 0) {            nsCRT::memcpy(aBuf, mBuffer, amt);            mBuffer += amt;            mLength -= amt;        }        *aReadCount = amt;        return NS_OK;    } 