/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* * This file is part of the LibreOffice project. * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * * This file incorporates work covered by the following license notice: * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed * with this work for additional information regarding copyright * ownership. The ASF licenses this file to you under the Apache * License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 . */ #include #include #include using namespace com::sun::star; namespace comphelper { const char aBase64EncodeTable[] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' }; const sal_uInt8 aBase64DecodeTable[] = { 62,255,255,255, 63, // 43-47 // + / 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255, // 48-63 // 0 1 2 3 4 5 6 7 8 9 = 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 64-79 // A B C D E F G H I J K L M N O 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255, // 80-95 // P Q R S T U V W X Y Z 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 96-111 // a b c d e f g h i j k l m n o 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51 }; // 112-123 // p q r s t u v w x y z static void ThreeByteToFourByte(const sal_Int8* pBuffer, const sal_Int32 nStart, const sal_Int32 nFullLen, char* aCharBuffer) { sal_Int32 nLen(nFullLen - nStart); if (nLen > 3) nLen = 3; if (nLen == 0) { return; } sal_Int32 nBinaer; switch (nLen) { case 1: { nBinaer = static_cast(pBuffer[nStart + 0]) << 16; } break; case 2: { nBinaer = (static_cast(pBuffer[nStart + 0]) << 16) + (static_cast(pBuffer[nStart + 1]) << 8); } break; default: { nBinaer = (static_cast(pBuffer[nStart + 0]) << 16) + (static_cast(pBuffer[nStart + 1]) << 8) + static_cast(pBuffer[nStart + 2]); } break; } aCharBuffer[0] = aCharBuffer[1] = aCharBuffer[2] = aCharBuffer[3] = '='; sal_uInt8 nIndex (static_cast((nBinaer & 0xFC0000) >> 18)); aCharBuffer[0] = aBase64EncodeTable [nIndex]; nIndex = static_cast((nBinaer & 0x3F000) >> 12); aCharBuffer[1] = aBase64EncodeTable [nIndex]; if (nLen > 1) { nIndex = static_cast((nBinaer & 0xFC0) >> 6); aCharBuffer[2] = aBase64EncodeTable [nIndex]; if (nLen > 2) { nIndex = static_cast((nBinaer & 0x3F)); aCharBuffer[3] = aBase64EncodeTable [nIndex]; } } } void Base64::encode(OStringBuffer& aStrBuffer, const uno::Sequence& aPass) { sal_Int32 i(0); sal_Int32 nBufferLength(aPass.getLength()); const sal_Int8* pBuffer = aPass.getConstArray(); while (i < nBufferLength) { char aCharBuffer[4]; ThreeByteToFourByte(pBuffer, i, nBufferLength, aCharBuffer); aStrBuffer.append(aCharBuffer, SAL_N_ELEMENTS(aCharBuffer)); i += 3; } } void Base64::encode(OUStringBuffer& aStrBuffer, const uno::Sequence& aPass) { sal_Int32 i(0); sal_Int32 nBufferLength(aPass.getLength()); const sal_Int8* pBuffer = aPass.getConstArray(); while (i < nBufferLength) { char aCharBuffer[4]; ThreeByteToFourByte(pBuffer, i, nBufferLength, aCharBuffer); aStrBuffer.appendAscii(aCharBuffer, SAL_N_ELEMENTS(aCharBuffer)); i += 3; } } void Base64::decode(uno::Sequence& aBuffer, const OUString& sBuffer) { sal_Int32 nCharsDecoded = decodeSomeChars( aBuffer, sBuffer ); OSL_ENSURE( nCharsDecoded == sBuffer.getLength(), "some bytes left in base64 decoding!" ); } sal_Int32 Base64::decodeSomeChars(uno::Sequence& rOutBuffer, const OUString& rInBuffer) { sal_Int32 nInBufferLen = rInBuffer.getLength(); sal_Int32 nMinOutBufferLen = (nInBufferLen / 4) * 3; if( rOutBuffer.getLength() < nMinOutBufferLen ) rOutBuffer.realloc( nMinOutBufferLen ); const sal_Unicode *pInBuffer = rInBuffer.getStr(); sal_Int8 *pOutBuffer = rOutBuffer.getArray(); sal_Int8 *pOutBufferStart = pOutBuffer; sal_Int32 nCharsDecoded = 0; sal_uInt8 aDecodeBuffer[4]; sal_Int32 nBytesToDecode = 0; sal_Int32 nBytesGotFromDecoding = 3; sal_Int32 nInBufferPos= 0; while( nInBufferPos < nInBufferLen ) { sal_Unicode cChar = *pInBuffer; if( cChar >= '+' && cChar <= 'z' ) { sal_uInt8 nByte = aBase64DecodeTable[cChar-'+']; if( nByte != 255 ) { // We have found a valid character! aDecodeBuffer[nBytesToDecode++] = nByte; // One '=' character at the end means 2 out bytes // Two '=' characters at the end mean 1 out bytes if( '=' == cChar && nBytesToDecode > 2 ) nBytesGotFromDecoding--; if( 4 == nBytesToDecode ) { // Four characters found, so we may convert now! sal_uInt32 nOut = (aDecodeBuffer[0] << 18) + (aDecodeBuffer[1] << 12) + (aDecodeBuffer[2] << 6) + aDecodeBuffer[3]; *pOutBuffer++ = static_cast((nOut & 0xff0000) >> 16); if( nBytesGotFromDecoding > 1 ) *pOutBuffer++ = static_cast((nOut & 0xff00) >> 8); if( nBytesGotFromDecoding > 2 ) *pOutBuffer++ = static_cast(nOut & 0xff); nCharsDecoded = nInBufferPos + 1; nBytesToDecode = 0; nBytesGotFromDecoding = 3; } } else { nCharsDecoded++; } } else { nCharsDecoded++; } nInBufferPos++; pInBuffer++; } if( (pOutBuffer - pOutBufferStart) != rOutBuffer.getLength() ) rOutBuffer.realloc( pOutBuffer - pOutBufferStart ); return nCharsDecoded; } } /* vim:set shiftwidth=4 softtabstop=4 expandtab: */