nsCRT::memcpy(aToBuf, fromBuf + aOffset, aCount);
memcpy(aToBuf, fromBuf + aOffset, aCount);
nsReadFromBuffer(nsIOutputStream *aOutput,                 void *aClosure,                 char *aToBuf,                 PRUint32 aOffset,                 PRUint32 aCount,                 PRUint32 *aReadCount){    const char *fromBuf = NS_REINTERPRET_CAST(const char *, aClosure);    nsCRT::memcpy(aToBuf, fromBuf + aOffset, aCount);    *aReadCount = aCount;    return NS_OK;}