gecko-dev/xpcom/io/nsIScriptableInputStream.idl

/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIInputStream;

/**
 * nsIScriptableInputStream provides scriptable access to an nsIInputStream
 * instance.
 */
[scriptable, uuid(3fce9015-472a-4080-ac3e-cd875dbe361e)]
interface nsIScriptableInputStream : nsISupports
{ 
    /** 
     * Closes the stream. 
     */
    void close();

    /**
     * Wrap the given nsIInputStream with this nsIScriptableInputStream. 
     *
     * @param aInputStream parameter providing the stream to wrap 
     */ 
    void init(in nsIInputStream aInputStream); 

    /**
     * Return the number of bytes currently available in the stream 
     *
     * @return the number of bytes 
     *
     * @throws NS_BASE_STREAM_CLOSED if called after the stream has been closed
     */ 
    unsigned long long available(); 

    /**
     * Read data from the stream.
     *
     * WARNING: If the data contains a null byte, then this method will return
     * a truncated string.
     *
     * @param aCount the maximum number of bytes to read 
     *
     * @return the data, which will be an empty string if the stream is at EOF.
     *
     * @throws NS_BASE_STREAM_CLOSED if called after the stream has been closed
     * @throws NS_ERROR_NOT_INITIALIZED if init was not called
     */ 
    string read(in unsigned long aCount); 

    /**
     * Read data from the stream, including NULL bytes.
     *
     * @param aCount the maximum number of bytes to read.
     *
     * @return the data from the stream, which will be an empty string if EOF
     *         has been reached.
     *
     * @throws NS_BASE_STREAM_WOULD_BLOCK if reading from the input stream
     *         would block the calling thread (non-blocking mode only).
     * @throws NS_ERROR_FAILURE if there are not enough bytes available to read
     *         aCount amount of data.
     */
    ACString readBytes(in unsigned long aCount);
};