1 files changed, 312 insertions, 0 deletions
diff --git a/desktop/source/deployment/dp_persmap.cxx b/desktop/source/deployment/dp_persmap.cxx
new file mode 100644
index 000000000..8b032fffb
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+++ b/desktop/source/deployment/dp_persmap.cxx
@@ -0,0 +1,312 @@
+/* -*- 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 <cstddef>
+
+#include <dp_misc.h>
+#include <dp_persmap.h>
+#include <o3tl/safeint.hxx>
+#include <rtl/byteseq.hxx>
+#include <rtl/strbuf.hxx>
+#include <sal/log.hxx>
+
+using namespace ::rtl;
+
+// the persistent map is used to manage a handful of key-value string pairs
+// this implementation replaces a rather heavy-weight berkeleydb integration
+
+// the file backing up a persistent map consists of line pairs with
+// - a key string   (encoded with chars 0x00..0x0F being escaped)
+// - a value string (encoded with chars 0x00..0x0F being escaped)
+
+namespace dp_misc
+{
+
+const char PmapMagic[4] = {'P','m','p','1'};
+
+PersistentMap::PersistentMap( OUString const & url_ )
+:    m_MapFile( expandUnoRcUrl(url_) )
+,    m_bIsOpen( false )
+,    m_bToBeCreated( true )
+,    m_bIsDirty( false )
+{
+    open();
+}
+
+PersistentMap::PersistentMap()
+:    m_MapFile( OUString() )
+,    m_bIsOpen( false )
+,    m_bToBeCreated( false )
+,    m_bIsDirty( false )
+{}
+
+PersistentMap::~PersistentMap()
+{
+    if( m_bIsDirty )
+        flush();
+    if( m_bIsOpen )
+        m_MapFile.close();
+}
+
+
+// replace 0x00..0x0F with "%0".."%F"
+// replace "%" with "%%"
+static OString encodeString( const OString& rStr)
+{
+    const char* pChar = rStr.getStr();
+    const sal_Int32 nLen = rStr.getLength();
+    sal_Int32 i = nLen;
+    // short circuit for the simple non-encoded case
+    while( --i >= 0)
+    {
+        const unsigned char c = static_cast<unsigned char>(*(pChar++));
+        if( c <= 0x0F )
+            break;
+        if( c == '%')
+            break;
+    }
+    if( i < 0)
+        return rStr;
+
+    // escape chars 0x00..0x0F with "%0".."%F"
+    OStringBuffer aEncStr( nLen + 32);
+    aEncStr.append( pChar - (nLen-i), nLen - i);
+    while( --i >= 0)
+    {
+        unsigned char c = static_cast<unsigned char>(*(pChar++));
+        if( c <= 0x0F )
+        {
+            aEncStr.append( '%');
+            c += (c <= 0x09) ? '0' : 'A'-10;
+        } else if( c == '%')
+            aEncStr.append( '%');
+        aEncStr.append( char(c) );
+    }
+
+    return aEncStr.makeStringAndClear();
+}
+
+// replace "%0".."%F" with 0x00..0x0F
+// replace "%%" with "%"
+static OString decodeString( const char* pEncChars, int nLen)
+{
+    const char* pChar = pEncChars;
+    sal_Int32 i = nLen;
+    // short circuit for the simple non-encoded case
+    while( --i >= 0)
+        if( *(pChar++) == '%')
+            break;
+    if( i < 0)
+        return OString( pEncChars, nLen);
+
+    // replace escaped chars with their decoded counterparts
+    OStringBuffer aDecStr( nLen);
+    pChar = pEncChars;
+    for( i = nLen; --i >= 0;)
+    {
+        char c = *(pChar++);
+        // handle escaped character
+        if( c == '%')
+        {
+            --i;
+            OSL_ASSERT( i >= 0);
+            c = *(pChar++);
+            if( ('0' <= c) && (c <= '9'))
+                c -= '0';
+            else
+            {
+                OSL_ASSERT( ('A' <= c) && (c <= 'F'));
+                c -= ('A'-10);
+            }
+        }
+        aDecStr.append( c);
+    }
+
+    return aDecStr.makeStringAndClear();
+}
+
+void PersistentMap::open()
+{
+    // open the existing file
+    sal_uInt32 const nOpenFlags = osl_File_OpenFlag_Read | osl_File_OpenFlag_Write;
+
+    const osl::File::RC rcOpen = m_MapFile.open( nOpenFlags);
+    m_bIsOpen = (rcOpen == osl::File::E_None);
+
+    // or create later if needed
+    m_bToBeCreated &= (rcOpen == osl::File::E_NOENT) && !m_bIsOpen;
+
+    if( !m_bIsOpen)
+        return;
+
+    readAll();
+}
+
+
+void PersistentMap::readAll()
+{
+    // prepare for re-reading the map-file
+    m_entries.clear();
+    const osl::FileBase::RC nRes = m_MapFile.setPos( osl_Pos_Absolut, 0);
+    if (nRes != osl::FileBase::E_None)
+    {
+        SAL_WARN("desktop.deployment", "setPos failed with " << +nRes);
+        return;
+    }
+
+    // read header and check magic
+    char aHeaderBytes[ sizeof(PmapMagic)];
+    sal_uInt64 nBytesRead = 0;
+    m_MapFile.read( aHeaderBytes, sizeof(aHeaderBytes), nBytesRead);
+    OSL_ASSERT( nBytesRead == sizeof(aHeaderBytes));
+    if( nBytesRead != sizeof(aHeaderBytes))
+        return;
+    // check header magic
+    for( std::size_t i = 0; i < sizeof(PmapMagic); ++i)
+        if( aHeaderBytes[i] != PmapMagic[i])
+            return;
+
+    // read key value pairs and add them to the map
+    ByteSequence aKeyLine;
+    ByteSequence aValLine;
+    for(;;)
+    {
+        // read key-value line pair
+        // an empty key name indicates the end of the line pairs
+        if( m_MapFile.readLine( aKeyLine) != osl::File::E_None)
+            return;
+        if( !aKeyLine.getLength())
+            break;
+        if( m_MapFile.readLine( aValLine) != osl::File::E_None)
+            return;
+        // decode key and value strings
+        const OString aKeyName = decodeString( reinterpret_cast<char const *>(aKeyLine.getConstArray()), aKeyLine.getLength());
+        const OString aValName = decodeString( reinterpret_cast<char const *>(aValLine.getConstArray()), aValLine.getLength());
+        // insert key-value pair into map
+        add( aKeyName, aValName );
+        // check end-of-file status
+        sal_Bool bIsEOF = true;
+        if( m_MapFile.isEndOfFile( &bIsEOF) != osl::File::E_None )
+            return;
+        if( bIsEOF )
+            break;
+    }
+
+    m_bIsDirty = false;
+}
+
+void PersistentMap::flush()
+{
+    if( !m_bIsDirty)
+        return;
+    if( m_bToBeCreated && !m_entries.empty())
+    {
+        const sal_uInt32 nOpenFlags = osl_File_OpenFlag_Read | osl_File_OpenFlag_Write | osl_File_OpenFlag_Create;
+        const osl::File::RC rcOpen = m_MapFile.open( nOpenFlags);
+        m_bIsOpen = (rcOpen == osl::File::E_None);
+        m_bToBeCreated = !m_bIsOpen;
+    }
+    if( !m_bIsOpen)
+        return;
+
+    // write header magic
+    const osl::FileBase::RC nRes = m_MapFile.setPos( osl_Pos_Absolut, 0);
+    if (nRes != osl::FileBase::E_None)
+    {
+        SAL_WARN("desktop.deployment", "setPos failed with " << +nRes);
+        return;
+    }
+    sal_uInt64 nBytesWritten = 0;
+    m_MapFile.write( PmapMagic, sizeof(PmapMagic), nBytesWritten);
+
+    // write key value pairs
+    for (auto const& entry : m_entries)
+    {
+        // write line for key
+        const OString aKeyString = encodeString( entry.first);
+        const sal_Int32 nKeyLen = aKeyString.getLength();
+        m_MapFile.write( aKeyString.getStr(), nKeyLen, nBytesWritten);
+        OSL_ASSERT( o3tl::make_unsigned(nKeyLen) == nBytesWritten);
+        m_MapFile.write( "\n", 1, nBytesWritten);
+        // write line for value
+        const OString& rValString = encodeString( entry.second);
+        const sal_Int32 nValLen = rValString.getLength();
+        m_MapFile.write( rValString.getStr(), nValLen, nBytesWritten);
+        OSL_ASSERT( o3tl::make_unsigned(nValLen) == nBytesWritten);
+        m_MapFile.write( "\n", 1, nBytesWritten);
+    }
+
+    // write a file delimiter (an empty key-string)
+    m_MapFile.write( "\n", 1, nBytesWritten);
+    // truncate file here
+    sal_uInt64 nNewFileSize;
+    if( m_MapFile.getPos( nNewFileSize) == osl::File::E_None)
+        m_MapFile.setSize( nNewFileSize);
+    // flush to disk
+    m_MapFile.sync();
+    // the in-memory map now matches to the file on disk
+    m_bIsDirty = false;
+}
+
+bool PersistentMap::has( OString const & key ) const
+{
+    return get( nullptr, key );
+}
+
+bool PersistentMap::get( OString * value, OString const & key ) const
+{
+    t_string2string_map::const_iterator it = m_entries.find( key);
+    if( it == m_entries.end())
+        return false;
+    if( value)
+        *value = it->second;
+    return true;
+}
+
+void PersistentMap::add( OString const & key, OString const & value )
+{
+    auto r = m_entries.emplace(key,value);
+    m_bIsDirty = r.second;
+}
+
+
+void PersistentMap::put( OString const & key, OString const & value )
+{
+    add( key, value);
+    // HACK: flush now as the extension manager does not seem
+    //       to properly destruct this object in some situations
+    if(m_bIsDirty)
+        flush();
+}
+
+bool PersistentMap::erase( OString const & key )
+{
+    size_t nCount = m_entries.erase( key);
+    if( !nCount)
+        return false;
+    m_bIsDirty = true;
+    flush();
+    return true;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */