diff options
Diffstat (limited to 'basic/source/comp/buffer.cxx')
| -rw-r--r-- | basic/source/comp/buffer.cxx | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/basic/source/comp/buffer.cxx b/basic/source/comp/buffer.cxx new file mode 100644 index 000000000..80017fcca --- /dev/null +++ b/basic/source/comp/buffer.cxx @@ -0,0 +1,221 @@ +/* -*- 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 <buffer.hxx> +#include <parser.hxx> + +#include <basic/sberrors.hxx> + +const static sal_uInt32 UP_LIMIT=0xFFFFFF00; + +// The SbiBuffer will be expanded in increments of at least 16 Bytes. +// This is necessary, because many classes emanate from a buffer length +// of x*16 Bytes. + +SbiBuffer::SbiBuffer( SbiParser* p, short n ) +{ + pParser = p; + n = ( (n + 15 ) / 16 ) * 16; + if( !n ) n = 16; + pBuf = nullptr; + pCur = nullptr; + nInc = n; + nSize = + nOff = 0; +} + +SbiBuffer::~SbiBuffer() +{ +} + +// Reach out the buffer +// This lead to the deletion of the buffer! + +char* SbiBuffer::GetBuffer() +{ + char* p = pBuf.release(); + pCur = nullptr; + return p; +} + +// Test, if the buffer can contain n Bytes. +// In case of doubt it will be enlarged + +bool SbiBuffer::Check( sal_Int32 n ) +{ + if( !n ) + { + return true; + } + if( nOff + n > nSize ) + { + if( nInc == 0 ) + { + return false; + } + + sal_Int32 nn = 0; + while( nn < n ) + { + nn = nn + nInc; + } + char* p; + if( ( nSize + nn ) > UP_LIMIT ) + { + p = nullptr; + } + else + { + p = new char [nSize + nn]; + } + if( !p ) + { + pParser->Error( ERRCODE_BASIC_PROG_TOO_LARGE ); + nInc = 0; + pBuf.reset(); + return false; + } + else + { + if( nSize ) memcpy( p, pBuf.get(), nSize ); + pBuf.reset(p); + pCur = pBuf.get() + nOff; + nSize = nSize + nn; + } + } + return true; +} + +// Patch of a Location + +void SbiBuffer::Patch( sal_uInt32 off, sal_uInt32 val ) +{ + if( ( off + sizeof( sal_uInt32 ) ) < nOff ) + { + sal_uInt16 val1 = static_cast<sal_uInt16>( val & 0xFFFF ); + sal_uInt16 val2 = static_cast<sal_uInt16>( val >> 16 ); + sal_uInt8* p = reinterpret_cast<sal_uInt8*>(pBuf.get()) + off; + *p++ = static_cast<char>( val1 & 0xFF ); + *p++ = static_cast<char>( val1 >> 8 ); + *p++ = static_cast<char>( val2 & 0xFF ); + *p = static_cast<char>( val2 >> 8 ); + } +} + +// Forward References upon label and procedures +// establish a linkage. The beginning of the linkage is at the passed parameter, +// the end of the linkage is 0. + +void SbiBuffer::Chain( sal_uInt32 off ) +{ + if( !(off && pBuf) ) + return; + + sal_uInt8 *ip; + sal_uInt32 i = off; + sal_uInt32 val1 = (nOff & 0xFFFF); + sal_uInt32 val2 = (nOff >> 16); + do + { + ip = reinterpret_cast<sal_uInt8*>(pBuf.get()) + i; + sal_uInt8* pTmp = ip; + i = *pTmp++; i |= *pTmp++ << 8; i |= *pTmp++ << 16; i |= *pTmp++ << 24; + + if( i >= nOff ) + { + pParser->Error( ERRCODE_BASIC_INTERNAL_ERROR, "BACKCHAIN" ); + break; + } + *ip++ = static_cast<char>( val1 & 0xFF ); + *ip++ = static_cast<char>( val1 >> 8 ); + *ip++ = static_cast<char>( val2 & 0xFF ); + *ip = static_cast<char>( val2 >> 8 ); + } while( i ); +} + +void SbiBuffer::operator +=( sal_Int8 n ) +{ + if( Check( 1 ) ) + { + *pCur++ = static_cast<char>(n); + nOff += 1; + } +} + +bool SbiBuffer::operator +=( sal_uInt8 n ) +{ + if( Check( 1 ) ) + { + *pCur++ = static_cast<char>(n); + nOff += 1; + return true; + } + else + { + return false; + } +} + +void SbiBuffer::operator +=( sal_Int16 n ) +{ + if( Check( 2 ) ) + { + *pCur++ = static_cast<char>( n & 0xFF ); + *pCur++ = static_cast<char>( n >> 8 ); + nOff += 2; + } +} + +bool SbiBuffer::operator +=( sal_uInt16 n ) +{ + if( Check( 2 ) ) + { + *pCur++ = static_cast<char>( n & 0xFF ); + *pCur++ = static_cast<char>( n >> 8 ); + nOff += 2; + return true; + } + else + { + return false; + } +} + +bool SbiBuffer::operator +=( sal_uInt32 n ) +{ + if( Check( 4 ) ) + { + sal_uInt16 n1 = static_cast<sal_uInt16>( n & 0xFFFF ); + sal_uInt16 n2 = static_cast<sal_uInt16>( n >> 16 ); + operator +=(n1) && operator +=(n2); + return true; + } + else + { + return false; + } +} + +void SbiBuffer::operator +=( sal_Int32 n ) +{ + operator +=( static_cast<sal_uInt32>(n) ); +} + + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |