gecko-dev/xpcom/io/nsIStringStream.idl

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
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 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   mcmullen@netscape.com (original author)
 *   scc@mozilla.org    
 *   davidm@netscape.com
 *   darin@netscape.com
 *
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/**
 * Based on original code from nsIStringStream.h
 */

#include "nsISupports.idl"

/**
 * nsIStringInputStream
 *
 * Provides scriptable and specialized C++ only methods for initializing a
 * nsIInputStream implementation with a simple character array.
 */
[scriptable, uuid(450cd2d4-f0fd-424d-b365-b1251f80fd53)]
interface nsIStringInputStream : nsISupports
{
    /**
     * SetData - assign data to the input stream (copied on assignment).
     *
     * @param data    - stream data
     * @param dataLen - stream data length (-1 if length should be computed)
     *
     * NOTE: C++ code should consider using AdoptData or ShareData to avoid
     * making an extra copy of the stream data.
     */
    void setData(in string data, in long dataLen);

    /**
     * NOTE: the following methods are designed to give C++ code added control
     * over the ownership and lifetime of the stream data.  Use with care :-)
     */

    /**
     * AdoptData - assign data to the input stream.  the input stream takes
     * ownership of the given data buffer and will nsMemory::Free it when
     * the input stream is destroyed.
     *
     * @param data      - stream data
     * @param dataLen   - stream data length (-1 if length should be computed)
     */
    [noscript] void adoptData(in charPtr data, in long dataLen);

    /**
     * ShareData - assign data to the input stream.  the input stream references
     * the given data buffer until the input stream is destroyed.  the given
     * data buffer must outlive the input stream.
     *
     * @param data      - stream data
     * @param dataLen   - stream data length (-1 if length should be computed)
     */
    [noscript] void shareData(in string data, in long dataLen);
};

%{C++

//----------------------------------------------------------------------------------------
// C++ factory methods
//----------------------------------------------------------------------------------------

#include "nsIInputStream.h"
#include "nsIOutputStream.h"
#include "nsString.h"

//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewStringInputStream(
    nsIInputStream** aStreamResult,
    const nsAString& aStringToRead);
    // Factory method to get an nsInputStream from a string.  Result will implement all the
    // file stream interfaces in nsIFileStream.h

//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewCStringInputStream(
    nsIInputStream** aStreamResult,
    const nsACString& aStringToRead);
    // Factory method to get an nsInputStream from a cstring.  Result will implement all the
    // file stream interfaces in nsIFileStream.h

//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewCharInputStream(
    nsISupports** aStreamResult,
    const char* aStringToRead);
    // Factory method to get an nsInputStream from a string.  Result will implement all the
    // file stream interfaces in nsIFileStream.h

//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewCharOutputStream(
    nsISupports** aStreamResult,
    char** aStringToChange);
    // Factory method to get an nsOutputStream to a string.  Result will implement all the
    // file stream interfaces in nsIFileStream.h


//----------------------------------------------------------------------------------------
extern "C" NS_COM nsresult NS_NewByteInputStream(
    nsISupports** aStreamResult,
    const char* aStringToRead,
    PRInt32 aLength);
    // Factory method to get an nsInputStream from a string.  Result will implement all the
    // 

%}