epoc32/include/networking/vjcomp.inl
author William Roberts <williamr@symbian.org>
Tue, 16 Mar 2010 16:12:26 +0000
branchSymbian2
changeset 2 2fe1408b6811
permissions -rw-r--r--
Final list of Symbian^2 public API header files
williamr@2
     1
// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
williamr@2
     2
// All rights reserved.
williamr@2
     3
// This component and the accompanying materials are made available
williamr@2
     4
// under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members
williamr@2
     5
// which accompanies this distribution, and is available
williamr@2
     6
// at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".
williamr@2
     7
//
williamr@2
     8
// Initial Contributors:
williamr@2
     9
// Nokia Corporation - initial contribution.
williamr@2
    10
//
williamr@2
    11
// Contributors:
williamr@2
    12
//
williamr@2
    13
// Description:
williamr@2
    14
//
williamr@2
    15
williamr@2
    16
#if !defined(__VJCOMP_INL_)
williamr@2
    17
#define __VJCOMP_INL_
williamr@2
    18
williamr@2
    19
/**
williamr@2
    20
Tests if the delta value is compressible into the 16 bit VJ delta format.
williamr@2
    21
The aDelta value actually needs a 33 bit signed integer to hold the entire
williamr@2
    22
possible range, but the twos complement math works out if it's just
williamr@2
    23
stored as a 32 bit unsigned integer.
williamr@2
    24
williamr@2
    25
@param aDelta Delta value to test
williamr@2
    26
williamr@2
    27
@return ETrue if the value is compressible
williamr@2
    28
*/
williamr@2
    29
inline TBool CVJCompressor::IsDeltaCompressible(TUint32 aDelta) const
williamr@2
    30
	{
williamr@2
    31
	// This test is a faster equivalent to:
williamr@2
    32
	//    (aDelta >= 0) && (aDelta <= 0xffff)
williamr@2
    33
	// if aDelta were signed
williamr@2
    34
	return !(aDelta & 0xffff0000);
williamr@2
    35
	}
williamr@2
    36
williamr@2
    37
williamr@2
    38
inline TUint8* CVJCompressor::GetTCPOpts(ThdrTCP* aTCPHeader) const
williamr@2
    39
/**
williamr@2
    40
Returns a pointer to the start of the TCP options (if there are any).
williamr@2
    41
williamr@2
    42
@param aTCPHeader TCP header
williamr@2
    43
williamr@2
    44
@return Start of the TCP options
williamr@2
    45
*/
williamr@2
    46
	{
williamr@2
    47
	TUint8* aPtr = (TUint8*)aTCPHeader+KTCPHeaderSize;
williamr@2
    48
	return aPtr;
williamr@2
    49
	}
williamr@2
    50
williamr@2
    51
williamr@2
    52
williamr@2
    53
#endif // __VJCOMP_INL_