omadrm/drmengine/utils/src/Base64.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 19 Aug 2010 10:12:10 +0300
branchRCL_3
changeset 67 50c53e893c3f
parent 18 8a03a285ab14
permissions -rw-r--r--
Revision: 201030 Kit: 201033
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/*
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* Copyright (c) 2002-2004 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  ?Description
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*
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*/
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// INCLUDE FILES
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#include <e32std.h>
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#include "Base64.h"
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// LOCAL CONSTANTS AND MACROS
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LOCAL_C const TUint8* const KBase64Chars =
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    _S8("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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    "abcdefghijklmnopqrstuvwxyz"
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    "0123456789+/");
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// LOCAL FUNCTION PROTOTYPES
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LOCAL_C TUint8 FindBase64Char(
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    TUint aChar);
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// ============================= LOCAL FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// ?function_name ?description.
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// ?description
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// Returns: ?value_1: ?description
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//          ?value_n: ?description_line1
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//                    ?description_line2
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// -----------------------------------------------------------------------------
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//
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LOCAL_C TUint8 FindBase64Char(
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    TUint aChar)
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    {
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    TUint8 i;
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    for (i = 0; i < 64; i++)
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        {
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        if (aChar == KBase64Chars[i]) break;
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        }
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    return i;
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    }
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// ========================== OTHER EXPORTED FUNCTIONS =========================
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// -----------------------------------------------------------------------------
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// ?function_name implements...
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// ?implementation_description.
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// Returns: ?value_1: ?description
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//          ?value_n: ?description
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//                    ?description
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// -----------------------------------------------------------------------------
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//
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EXPORT_C HBufC8* Base64EncodeL(
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    const TDesC8& aInput)
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    {
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    HBufC8* ret;
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    TInt i = 0;
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    TInt j = 0;
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    TUint8 charArray3[3];
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    TUint8 charArray4[4];
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    TInt l = 0;
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    ret = HBufC8::NewL((aInput.Length() * 4 + 1) / 3);
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    TPtr8 des = ret->Des();
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    while (l < aInput.Length())
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        {
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        charArray3[i++] = aInput[l];
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        l++;
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        if (i == 3)
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            {
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            charArray4[0] = static_cast<TUint8>((charArray3[0] & 0xfc) >> 2);
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            charArray4[1] = static_cast<TUint8>(
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                ((charArray3[0] & 0x03) << 4) + ((charArray3[1] & 0xf0) >> 4));
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            charArray4[2] = static_cast<TUint8>(
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                ((charArray3[1] & 0x0f) << 2) + ((charArray3[2] & 0xc0) >> 6));
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            charArray4[3] = static_cast<TUint8>(charArray3[2] & 0x3f);
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            for (i = 0; i <4; i++)
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                {
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                des.Append(KBase64Chars[charArray4[i]]);
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                }
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            i = 0;
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            }
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        }
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0
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    if (i != 0)
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        {
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        for (j = i; j < 3; j++)
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            {
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            charArray3[j] = '\0';
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            }
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0
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        charArray4[0] = static_cast<TUint8>((charArray3[0] & 0xfc) >> 2);
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        charArray4[1] = static_cast<TUint8>(
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            ((charArray3[0] & 0x03) << 4) +((charArray3[1] & 0xf0) >> 4));
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        charArray4[2] = static_cast<TUint8>(
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            ((charArray3[1] & 0x0f) << 2) +((charArray3[2] & 0xc0) >> 6));
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        charArray4[3] = static_cast<TUint8>(charArray3[2] & 0x3f);
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0
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        for (j = 0; j < i + 1; j++)
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            {
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            des.Append(KBase64Chars[charArray4[j]]);
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            }
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0
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        while ((i++ < 3))
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            {
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            des.Append('=');
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            }
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        }
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0
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    return ret;
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    }
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// -----------------------------------------------------------------------------
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// ?function_name implements...
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// ?implementation_description.
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// Returns: ?value_1: ?description
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//          ?value_n: ?description
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//                    ?description
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// -----------------------------------------------------------------------------
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//
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EXPORT_C HBufC8* Base64DecodeL(
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    const TDesC8& aInput)
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    {
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    TInt len = aInput.Length();
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    TInt i = 0;
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    TInt j = 0;
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    TInt in = 0;
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    TUint8 charArray4[4], charArray3[3];
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    HBufC8* ret;
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0
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    ret = HBufC8::NewL((aInput.Length() * 3 + 1) / 4);
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    TPtr8 des = ret->Des();
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    while (len-- && aInput[in] != '=')
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        {
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        if (FindBase64Char(aInput[in]) < 64)
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            {
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            charArray4[i++] = aInput[in]; in++;
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            }
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        else
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            {
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            in++;
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            }
18
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0
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        if (i == 4)
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            {
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            for (i = 0; i < 4; i++)
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                {
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                charArray4[i] = FindBase64Char(charArray4[i]);
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                }
18
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0
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            charArray3[0] = static_cast<TUint8>(
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                (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4));
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            charArray3[1] = static_cast<TUint8>(
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                ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2));
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            charArray3[2] = static_cast<TUint8>(
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            ((charArray4[2] & 0x3) << 6) + charArray4[3]);
18
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0
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            for (i = 0; i < 3; i++)
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                {
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                des.Append(charArray3[i]);
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                }
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            i = 0;
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            }
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        }
18
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0
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    if (i != 0)
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        {
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        for (j = i; j < 4; j++)
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   183
            {
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            charArray4[j] = 0;
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            }
18
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0
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   187
        for (j = 0; j < 4; j++)
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   188
            {
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   189
            charArray4[j] = FindBase64Char(charArray4[j]);
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   190
            }
18
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   191
0
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        charArray3[0] = static_cast<TUint8>(
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   193
            (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4));
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parents:
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   194
        charArray3[1] = static_cast<TUint8>(
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   195
            ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2));
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   196
        charArray3[2] = static_cast<TUint8>(
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   197
            ((charArray4[2] & 0x3) << 6) + charArray4[3]);
18
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   198
0
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   199
        for (j = 0; j < i - 1; j++)
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   200
            {
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   201
            des.Append(charArray3[j]);
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   202
            }
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   203
        }
18
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   204
0
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   205
    return ret;
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   206
    }
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   207
18
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diff changeset
   208
//  End of File