gecko-dev/xpcom/io/nsIBinaryOutputStream.idl

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *  
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *  
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation. Portions created by Netscape are
 * Copyright (C) 1998-1999 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 */

#include "nsIOutputStream.idl"
#include "nsrootidl.idl"

/**
 * This interface allows writing of primitive data types (integers,
 * floating-point values, booleans, etc.) to a stream in a binary, untagged,
 * fixed-endianness format.  This might be used, for example, to implement
 * network protocols or to produce architecture-neutral binary disk files,
 * i.e. ones that can be read and written by both big-endian and little-endian
 * platforms.  Output is written in big-endian order (high-order byte first),
 * as this is traditional network order.
 *
 * @See nsIBinaryInputStream
 */

[scriptable, uuid(204ee610-8765-11d3-90cf-0040056a906e)]
interface nsIBinaryOutputStream : nsIOutputStream {
    void setOutputStream(in nsIOutputStream aOutputStream);
    
    void writeBoolean(in PRBool aBoolean);

    void write8(in PRUint8 aByte);
    void write16(in PRUint16 a16);
    void write32(in PRUint32 a32);
    void write64(in PRUint64 a64);

    void writeFloat(in float aFloat);
    void writeDouble(in double aDouble);

    /**
     * Write a NUL-terminated 8-bit char* string to a binary stream.
     */
    void writeStringZ(in string aString);

    /**
     * Write a NUL-terminated 16-bit PRUnichar* string to a binary stream.
     */
    void writeWStringZ(in wstring aString);

    /**
     * Write a NUL-terminated UTF8-encoded string to a binary stream, produced
     * from a NUL-terminated 16-bit PRUnichar* string argument.
     */
    void writeUtf8Z(in wstring aString);

    /**
     * Write an opaque byte array to a binary stream.
     */
    void writeBytes([size_is(aLength)] in string aString, in PRUint32 aLength);
};

%{C++

NS_COM nsresult
NS_NewBinaryOutputStream(nsIBinaryOutputStream* *aResult, nsIOutputStream* aDestStream);

inline nsresult
NS_WriteOptionalStringZ(nsIBinaryOutputStream* aStream, const char* aString)
{
    PRBool nonnull = (aString != nsnull);
    nsresult rv = aStream->WriteBoolean(nonnull);
    if (NS_SUCCEEDED(rv) && nonnull)
        rv = aStream->WriteStringZ(aString);
    return rv;
}

inline nsresult
NS_WriteOptionalWStringZ(nsIBinaryOutputStream* aStream, const PRUnichar* aString)
{
    PRBool nonnull = (aString != nsnull);
    nsresult rv = aStream->WriteBoolean(nonnull);
    if (NS_SUCCEEDED(rv) && nonnull)
        rv = aStream->WriteWStringZ(aString);
    return rv;
}

%}