lwpobjstrm.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
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 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
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 *  Source 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.openoffice.org/license.html.
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#include <lwpobjstrm.hxx>
#include <lwptools.hxx>
 
#include <sal/types.h>
#include <tools/solar.h>
#include <memory>
 
LwpObjectStream::LwpObjectStream(LwpSvStream* pStrm, bool isCompressed, sal_uInt16 size)
    : m_pContentBuf(nullptr)
    , m_nBufSize(size)
    , m_nReadPos(0)
    , m_pStrm(pStrm)
    , m_bCompressed(isCompressed)
{
    if (m_nBufSize >= IO_BUFFERSIZE)
        throw std::range_error("bad Object size");
    // read object data from stream
    if (m_nBufSize > 0)
        Read2Buffer();
}
 
void LwpObjectStream::Read2Buffer()
{
    ReleaseBuffer();
 
    m_nReadPos = 0;
 
    if (m_bCompressed)
    {
        std::unique_ptr<sal_uInt8[]> xCompressBuf(new sal_uInt8[m_nBufSize]);
 
        sal_uInt8* pCompressBuffer = xCompressBuf.get();
        memset(pCompressBuffer, 0, m_nBufSize);
        m_nBufSize = m_pStrm->Read(pCompressBuffer, m_nBufSize);
 
        sal_uInt8 pTempDst[IO_BUFFERSIZE];
        m_nBufSize = DecompressBuffer(pTempDst, pCompressBuffer, m_nBufSize);
        assert(m_nBufSize < IO_BUFFERSIZE);
 
        m_pContentBuf = AllocBuffer(m_nBufSize);
        memcpy(m_pContentBuf, pTempDst, m_nBufSize);
    }
    else
    {
        m_pContentBuf = AllocBuffer(m_nBufSize);
        m_nBufSize = m_pStrm->Read(m_pContentBuf, m_nBufSize);
    }
}
sal_uInt8* LwpObjectStream::AllocBuffer(sal_uInt16 size)
{
    if (size <= 100)
    {
        return m_SmallBuffer;
    }
    m_BigBuffer.resize(size);
    return m_BigBuffer.data();
}
void LwpObjectStream::ReadComplete() { ReleaseBuffer(); }
 
LwpObjectStream::~LwpObjectStream() { ReleaseBuffer(); }
void LwpObjectStream::ReleaseBuffer()
{
    m_BigBuffer.clear();
    m_pContentBuf = nullptr;
}
 
sal_uInt16 LwpObjectStream::remainingSize() const { return m_nBufSize - m_nReadPos; }
 
sal_uInt16 LwpObjectStream::QuickRead(void* buf, sal_uInt16 len)
{
    memset(buf, 0, len);
    if (len > m_nBufSize - m_nReadPos)
    {
        len = m_nBufSize - m_nReadPos;
    }
    if (m_pContentBuf && len)
    {
        memcpy(buf, m_pContentBuf + m_nReadPos, len);
        m_nReadPos += len;
    }
    return len;
}
void LwpObjectStream::SeekRel(sal_uInt16 pos)
{
    if (pos > m_nBufSize - m_nReadPos)
        pos = m_nBufSize - m_nReadPos;
    m_nReadPos += pos;
}
void LwpObjectStream::Seek(sal_uInt16 pos)
{
    if (pos < m_nBufSize)
    {
        m_nReadPos = pos;
    }
}
 
bool LwpObjectStream::QuickReadBool()
{
    SVBT16 aValue = { 0 };
    QuickRead(aValue, sizeof(aValue));
    return static_cast<bool>(SVBT16ToUInt16(aValue));
}
sal_uInt32 LwpObjectStream::QuickReaduInt32(bool* pFailure)
{
    SVBT32 aValue = { 0 };
    sal_uInt16 nRead = QuickRead(aValue, sizeof(aValue));
    if (pFailure)
        *pFailure = (nRead != sizeof(aValue));
    return SVBT32ToUInt32(aValue);
}
sal_uInt16 LwpObjectStream::QuickReaduInt16(bool* pFailure)
{
    SVBT16 aValue = { 0 };
    sal_uInt16 nRead = QuickRead(aValue, sizeof(aValue));
    if (pFailure)
        *pFailure = (nRead != sizeof(aValue));
    return SVBT16ToUInt16(aValue);
}
sal_Int32 LwpObjectStream::QuickReadInt32()
{
    SVBT32 aValue = { 0 };
    QuickRead(aValue, sizeof(aValue));
    return static_cast<sal_Int32>(SVBT32ToUInt32(aValue));
}
sal_Int16 LwpObjectStream::QuickReadInt16()
{
    SVBT16 aValue = { 0 };
    QuickRead(aValue, sizeof(aValue));
 
    return static_cast<sal_Int16>(SVBT16ToUInt16(aValue));
}
sal_uInt8 LwpObjectStream::QuickReaduInt8(bool* pFailure)
{
    sal_uInt8 aValue = 0;
    sal_uInt16 nRead = QuickRead(&aValue, sizeof(aValue));
    if (pFailure)
        *pFailure = (nRead != sizeof(aValue));
    return aValue;
}
double LwpObjectStream::QuickReadDouble()
{
    union {
        double d;
        sal_uInt8 c[8];
    } s;
    memset(s.c, 0, sizeof(s.c));
    QuickRead(s.c, sizeof(s.c));
#if defined(OSL_BIGENDIAN)
    for (size_t i = 0; i < 4; ++i)
        std::swap(s.c[i], s.c[7 - i]);
#endif
    return s.d;
}
void LwpObjectStream::SkipExtra()
{
    sal_uInt16 extra = QuickReaduInt16();
    while (extra != 0)
        extra = QuickReaduInt16();
}
sal_uInt16 LwpObjectStream::CheckExtra() { return QuickReaduInt16(); }
sal_uInt16 LwpObjectStream::DecompressBuffer(sal_uInt8* pDst, sal_uInt8* pSrc, sal_uInt16 Size)
{
    sal_uInt16 Cnt;
    sal_uInt32 DstSize = 0;
 
    while (Size)
    {
        switch (*pSrc & 0xC0)
        {
            case 0x00:
                // 1 - 64 bytes of 0
                // Code 00zzzzzz
                // where zzzzzz is the count - 1 of compressed 0 bytes
 
                Cnt = (*pSrc++ & 0x3F) + 1;
                if (DstSize + Cnt >= IO_BUFFERSIZE)
                    throw BadDecompress();
                memset(pDst, 0, Cnt);
                pDst += Cnt;
                DstSize += Cnt;
                Size--;
                break;
 
            case 0x40:
                // 1 - 8 zeros followed by 1 - 8 non-zero
                // Code 01zzznnn binary
                // where zzz is the count - 1 of compressed zero bytes
                // and nnn is the count - 1 of following non-zero bytes
 
                Cnt = ((*pSrc & 0x38) >> 3) + 1;
                if (DstSize + Cnt >= IO_BUFFERSIZE)
                    throw BadDecompress();
                memset(pDst, 0, Cnt);
                pDst += Cnt;
                DstSize += Cnt;
                Cnt = (*pSrc++ & 0x07) + 1;
                if (Size < Cnt + 1)
                    throw BadDecompress();
                Size -= Cnt + 1;
                if (DstSize + Cnt >= IO_BUFFERSIZE)
                    throw BadDecompress();
                memcpy(pDst, pSrc, Cnt);
                pDst += Cnt;
                DstSize += Cnt;
                pSrc += Cnt;
                break;
 
            case 0x80:
                // 1 0 followed by 1 - 64 bytes of non-zero
                // Code 0x80 (or 0x40 if 8 or less non-zero)
                // Code 10nnnnnn binary
                // where nnnnnn is the count - 1 of following non-zero bytes
 
                *pDst++ = 0;
                DstSize++;
                [[fallthrough]];
 
            case 0xC0:
                // 1 - 64 bytes of non-zero
                // Code = 11nnnnnn binary
                // nnnnnn is the count less 1 of following non-zero bytes
 
                Cnt = (*pSrc++ & 0x3F) + 1;
                if (Size < Cnt + 1)
                    throw BadDecompress();
                Size -= Cnt + 1;
                if (DstSize + Cnt >= IO_BUFFERSIZE)
                    throw BadDecompress();
                memcpy(pDst, pSrc, Cnt);
                pDst += Cnt;
                DstSize += Cnt;
                pSrc += Cnt;
                break;
        }
        assert(DstSize < IO_BUFFERSIZE);
        if (DstSize >= IO_BUFFERSIZE)
            throw BadDecompress();
    }
    return static_cast<sal_uInt16>(DstSize);
}
OUString LwpObjectStream::QuickReadStringPtr()
{
    sal_uInt16 diskSize;
 
    diskSize = QuickReaduInt16();
    QuickReaduInt16(); //len
 
    OUString str;
    if (diskSize < sizeof diskSize)
        throw std::range_error("Too small size");
    LwpTools::QuickReadUnicode(this, str, diskSize - sizeof(diskSize), RTL_TEXTENCODING_MS_1252);
    return str;
}
 
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