gecko-dev/xpcom/io/nsIBinaryInputStream.idl

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/* -*- 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 "nsIInputStream.idl"
#include "nsrootidl.idl"
/**
* This interface allows consumption of primitive data types from a "binary
* stream" containing untagged, big-endian binary data, i.e. as produced by an
* implementation of nsIBinaryOutputStream. This might be used, for example,
* to implement network protocols or to read from architecture-neutral disk
* files, i.e. ones that can be read and written by both big-endian and
* little-endian platforms.
*
* @See nsIBinaryOutputStream
*/
[scriptable, uuid(7b456cb0-8772-11d3-90cf-0040056a906e)]
interface nsIBinaryInputStream : nsIInputStream {
void setInputStream(in nsIInputStream aInputStream);
PRBool readBoolean();
PRUint8 read8();
PRUint16 read16();
PRUint32 read32();
PRUint64 read64();
float readFloat();
double readDouble();
/**
* Read a NUL-terminated 8-bit char* string from a binary stream.
*/
ACString readCString();
/**
* Read a NUL-terminated 16-bit PRUnichar* string from a binary stream.
*/
AString readString();
/**
* Read an opaque byte array from a binary stream.
*/
void readBytes([size_is(aLength)] out string aString, in PRUint32 aLength);
};
%{C++
NS_COM nsresult
NS_NewBinaryInputStream(nsIBinaryInputStream* *aResult, nsIInputStream* aSrcStream);
inline nsresult
NS_ReadOptionalCString(nsIBinaryInputStream* aStream, nsACString& aResult)
{
PRBool nonnull;
nsresult rv = aStream->ReadBoolean(&nonnull);
if (NS_SUCCEEDED(rv)) {
if (nonnull)
rv = aStream->ReadCString(aResult);
else
aResult.Truncate();
}
return rv;
}
inline nsresult
NS_ReadOptionalString(nsIBinaryInputStream* aStream, nsAString& aResult)
{
PRBool nonnull;
nsresult rv = aStream->ReadBoolean(&nonnull);
if (NS_SUCCEEDED(rv)) {
if (nonnull)
rv = aStream->ReadString(aResult);
else
aResult.Truncate();
}
return rv;
}
%}