#include "nsIInputStream.idl"
#include "nsIOutputStream.idl"

/**
 * An input stream that reads ahead and keeps a buffer coming from another input
 * stream so that fewer accesses to the underlying stream are necessary.
 */
[scriptable, uuid(616f5b48-da09-11d3-8cda-0060b0fc14a3)]
interface nsIBufferedInputStream : nsIInputStream
{
    /**
     * @param fillFromStream - add buffering to this stream
     * @param bufferSize     - specifies the maximum buffer size
     */
    void init(in nsIInputStream fillFromStream,
              in unsigned long bufferSize);
};

/**
 * An output stream that stores up data to write out to another output stream
 * and does the entire write only when the buffer is full, so that fewer writes
 * to the underlying output stream are necessary.
 */
[scriptable, uuid(6476378a-da09-11d3-8cda-0060b0fc14a3)]
interface nsIBufferedOutputStream : nsIOutputStream
{
    /**
     * @param sinkToStream - add buffering to this stream
     * @param bufferSize   - specifies the maximum buffer size
     */
    void init(in nsIOutputStream sinkToStream,
              in unsigned long bufferSize);
};