Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 364 insertions, 0 deletions

diff --git a/tools/source/zcodec/zcodec.cxx b/tools/source/zcodec/zcodec.cxx
new file mode 100644
index 000000000..80daa1507
--- /dev/null
+++ b/tools/source/zcodec/zcodec.cxx
@@ -0,0 +1,364 @@
+/* -*- 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 <sal/config.h>
+
+#include <algorithm>
+
+#include <tools/stream.hxx>
+
+#include <zlib.h>
+
+#include <tools/zcodec.hxx>
+#include <tools/long.hxx>
+
+/* gzip flag byte */
+//      GZ_ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
+#define GZ_HEAD_CRC     0x02 /* bit 1 set: header CRC present */
+#define GZ_EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
+#define GZ_ORIG_NAME    0x08 /* bit 3 set: original file name present */
+#define GZ_COMMENT      0x10 /* bit 4 set: file comment present */
+#define GZ_RESERVED     0xE0 /* bits 5..7: reserved */
+
+constexpr sal_uInt16 GZ_MAGIC_BYTES_LE = 0x8B1F; /* gzip magic bytes, little endian */
+
+ZCodec::ZCodec( size_t nInBufSize, size_t nOutBufSize )
+    : meState(STATE_INIT)
+    , mbStatus(false)
+    , mbFinish(false)
+    , mnInBufSize(nInBufSize)
+    , mnInToRead(0)
+    , mpOStm(nullptr)
+    , mnOutBufSize(nOutBufSize)
+    , mnCompressLevel(0)
+    , mbGzLib(false)
+{
+    mpsC_Stream = new z_stream;
+}
+
+ZCodec::~ZCodec()
+{
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    delete pStream;
+}
+
+bool ZCodec::IsZCompressed( SvStream& rIStm )
+{
+    sal_uInt64 nCurPos = rIStm.Tell();
+    rIStm.Seek( 0 );
+    sal_uInt16 nFirstTwoBytes = 0;
+    rIStm.ReadUInt16( nFirstTwoBytes );
+    rIStm.Seek( nCurPos );
+    return nFirstTwoBytes == GZ_MAGIC_BYTES_LE;
+}
+
+void ZCodec::BeginCompression( int nCompressLevel, bool gzLib )
+{
+    assert(meState == STATE_INIT);
+    mbStatus = true;
+    mbFinish = false;
+    mpOStm = nullptr;
+    mnInToRead = 0xffffffff;
+    mpInBuf.reset();
+    mpOutBuf.reset();
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    pStream->total_out = pStream->total_in = 0;
+    mnCompressLevel = nCompressLevel;
+    mbGzLib = gzLib;
+    pStream->zalloc = nullptr;
+    pStream->zfree = nullptr;
+    pStream->opaque = nullptr;
+    pStream->avail_out = pStream->avail_in = 0;
+}
+
+tools::Long ZCodec::EndCompression()
+{
+    tools::Long retvalue = 0;
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+
+    if (meState != STATE_INIT)
+    {
+        if (meState == STATE_COMPRESS)
+        {
+            if (mbStatus)
+            {
+                do
+                {
+                    ImplWriteBack();
+                }
+                while ( deflate( pStream, Z_FINISH ) != Z_STREAM_END );
+
+                ImplWriteBack();
+            }
+
+            retvalue = pStream->total_in;
+            deflateEnd( pStream );
+        }
+        else
+        {
+            retvalue = pStream->total_out;
+            inflateEnd( pStream );
+        }
+        mpOutBuf.reset();
+        mpInBuf.reset();
+        meState = STATE_INIT;
+    }
+    return mbStatus ? retvalue : -1;
+}
+
+void ZCodec::Compress( SvStream& rIStm, SvStream& rOStm )
+{
+    assert(meState == STATE_INIT);
+    mpOStm = &rOStm;
+    InitCompress();
+    mpInBuf.reset(new sal_uInt8[ mnInBufSize ]);
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    for (;;)
+    {
+        pStream->next_in = mpInBuf.get();
+        pStream->avail_in = rIStm.ReadBytes( mpInBuf.get(), mnInBufSize );
+        if (pStream->avail_in == 0)
+            break;
+        if ( pStream->avail_out == 0 )
+            ImplWriteBack();
+        if ( deflate( pStream, Z_NO_FLUSH ) < 0 )
+        {
+            mbStatus = false;
+            break;
+        }
+    };
+}
+
+tools::Long ZCodec::Decompress( SvStream& rIStm, SvStream& rOStm )
+{
+    int err;
+    size_t nInToRead;
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    tools::Long    nOldTotal_Out = pStream->total_out;
+
+    assert(meState == STATE_INIT);
+    mpOStm = &rOStm;
+    InitDecompress(rIStm);
+    pStream->avail_out = mnOutBufSize;
+    mpOutBuf.reset(new sal_uInt8[ pStream->avail_out ]);
+    pStream->next_out = mpOutBuf.get();
+    do
+    {
+        if ( pStream->avail_out == 0 ) ImplWriteBack();
+        if ( pStream->avail_in == 0 && mnInToRead )
+        {
+            nInToRead = std::min( mnInBufSize, mnInToRead );
+            pStream->next_in = mpInBuf.get();
+            pStream->avail_in = rIStm.ReadBytes(mpInBuf.get(), nInToRead);
+            mnInToRead -= nInToRead;
+        }
+        err = mbStatus ? inflate(pStream, Z_NO_FLUSH) : Z_ERRNO;
+        if (err < 0 || err == Z_NEED_DICT)
+        {
+            mbStatus = false;
+            break;
+        }
+
+    }
+    while ( ( err != Z_STREAM_END)  && ( pStream->avail_in || mnInToRead ) );
+    ImplWriteBack();
+
+    return mbStatus ? static_cast<tools::Long>(pStream->total_out - nOldTotal_Out) : -1;
+}
+
+void ZCodec::Write( SvStream& rOStm, const sal_uInt8* pData, sal_uInt32 nSize )
+{
+    if (meState == STATE_INIT)
+    {
+        mpOStm = &rOStm;
+        InitCompress();
+    }
+    assert(&rOStm == mpOStm);
+
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    pStream->avail_in = nSize;
+    pStream->next_in = pData;
+
+    while ( pStream->avail_in || ( pStream->avail_out == 0 ) )
+    {
+        if ( pStream->avail_out == 0 )
+            ImplWriteBack();
+
+        if ( deflate( pStream, Z_NO_FLUSH ) < 0 )
+        {
+            mbStatus = false;
+            break;
+        }
+    }
+}
+
+tools::Long ZCodec::Read( SvStream& rIStm, sal_uInt8* pData, sal_uInt32 nSize )
+{
+    int err;
+    size_t nInToRead;
+
+    if ( mbFinish )
+        return 0;           // pStream->total_out;
+
+    if (meState == STATE_INIT)
+    {
+        InitDecompress(rIStm);
+    }
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    pStream->avail_out = nSize;
+    pStream->next_out = pData;
+    do
+    {
+        if ( pStream->avail_in == 0 && mnInToRead )
+        {
+            nInToRead = std::min(mnInBufSize, mnInToRead);
+            pStream->next_in = mpInBuf.get();
+            pStream->avail_in = rIStm.ReadBytes(mpInBuf.get(), nInToRead);
+            mnInToRead -= nInToRead;
+        }
+        err = mbStatus ? inflate(pStream, Z_NO_FLUSH) : Z_ERRNO;
+        if (err < 0 || err == Z_NEED_DICT)
+        {
+            // Accept Z_BUF_ERROR as EAGAIN or EWOULDBLOCK.
+            mbStatus = (err == Z_BUF_ERROR);
+            break;
+        }
+    }
+    while ( (err != Z_STREAM_END) &&
+            (pStream->avail_out != 0) &&
+            (pStream->avail_in || mnInToRead) );
+    if ( err == Z_STREAM_END )
+        mbFinish = true;
+
+    return (mbStatus ? static_cast<tools::Long>(nSize - pStream->avail_out) : -1);
+}
+
+void ZCodec::ImplWriteBack()
+{
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    size_t nAvail = mnOutBufSize - pStream->avail_out;
+
+    if ( nAvail > 0 )
+    {
+        pStream->next_out = mpOutBuf.get();
+        mpOStm->WriteBytes( mpOutBuf.get(), nAvail );
+        pStream->avail_out = mnOutBufSize;
+    }
+}
+
+void ZCodec::InitCompress()
+{
+    assert(meState == STATE_INIT);
+    meState = STATE_COMPRESS;
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    mbStatus = deflateInit2_(
+        pStream, mnCompressLevel, Z_DEFLATED, MAX_WBITS, MAX_MEM_LEVEL,
+        Z_DEFAULT_STRATEGY, ZLIB_VERSION, sizeof (z_stream)) >= 0;
+    mpOutBuf.reset(new sal_uInt8[mnOutBufSize]);
+    pStream->next_out = mpOutBuf.get();
+    pStream->avail_out = mnOutBufSize;
+}
+
+void ZCodec::InitDecompress(SvStream & inStream)
+{
+    assert(meState == STATE_INIT);
+    auto pStream = static_cast<z_stream*>(mpsC_Stream);
+    if ( mbStatus &&  mbGzLib )
+    {
+        sal_uInt8 j, nMethod, nFlags;
+        sal_uInt16 nFirstTwoBytes;
+        inStream.Seek( 0 );
+        inStream.ReadUInt16( nFirstTwoBytes );
+        if ( nFirstTwoBytes != GZ_MAGIC_BYTES_LE )
+            mbStatus = false;
+        inStream.ReadUChar( nMethod );
+        inStream.ReadUChar( nFlags );
+        if ( nMethod != Z_DEFLATED )
+            mbStatus = false;
+        if ( ( nFlags & GZ_RESERVED ) != 0 )
+            mbStatus = false;
+        /* Discard time, xflags and OS code: */
+        inStream.SeekRel( 6 );
+        /* skip the extra field */
+        if ( nFlags & GZ_EXTRA_FIELD )
+        {
+            sal_uInt8 n1, n2;
+            inStream.ReadUChar( n1 ).ReadUChar( n2 );
+            inStream.SeekRel( n1 + ( n2 << 8 ) );
+        }
+        /* skip the original file name */
+        if ( nFlags & GZ_ORIG_NAME)
+        {
+            do
+            {
+                inStream.ReadUChar( j );
+            }
+            while ( j && !inStream.eof() );
+        }
+        /* skip the .gz file comment */
+        if ( nFlags & GZ_COMMENT )
+        {
+            do
+            {
+                inStream.ReadUChar( j );
+            }
+            while ( j && !inStream.eof() );
+        }
+        /* skip the header crc */
+        if ( nFlags & GZ_HEAD_CRC )
+            inStream.SeekRel( 2 );
+        if ( mbStatus )
+            mbStatus = inflateInit2( pStream, -MAX_WBITS) == Z_OK;
+    }
+    else
+    {
+        mbStatus = ( inflateInit( pStream ) >= 0 );
+    }
+    if ( mbStatus )
+        meState = STATE_DECOMPRESS;
+    mpInBuf.reset(new sal_uInt8[ mnInBufSize ]);
+}
+
+bool ZCodec::AttemptDecompression(SvStream& rIStm, SvStream& rOStm)
+{
+    assert(meState == STATE_INIT);
+    sal_uInt64 nStreamPos = rIStm.Tell();
+    BeginCompression(ZCODEC_DEFAULT_COMPRESSION, true/*gzLib*/);
+    InitDecompress(rIStm);
+    EndCompression();
+    if ( !mbStatus || rIStm.GetError() )
+    {
+        rIStm.Seek(nStreamPos);
+        return false;
+    }
+    rIStm.Seek(nStreamPos);
+    BeginCompression(ZCODEC_DEFAULT_COMPRESSION, true/*gzLib*/);
+    Decompress(rIStm, rOStm);
+    EndCompression();
+    if( !mbStatus || rIStm.GetError() || rOStm.GetError() )
+    {
+        rIStm.Seek(nStreamPos);
+        return false;
+    }
+    rIStm.Seek(nStreamPos);
+    rOStm.Seek(0);
+    return true;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */