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, 371 insertions, 0 deletions

diff --git a/svl/source/misc/inethist.cxx b/svl/source/misc/inethist.cxx
new file mode 100644
index 000000000..dc25d6b0b
--- /dev/null
+++ b/svl/source/misc/inethist.cxx
@@ -0,0 +1,371 @@
+/* -*- 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 <svl/inethist.hxx>
+
+#include <algorithm>
+#include <string.h>
+
+#include <rtl/crc.h>
+#include <tools/debug.hxx>
+#include <tools/urlobj.hxx>
+
+/*
+ * INetURLHistory internals.
+ */
+#define INETHIST_DEF_FTP_PORT    21
+#define INETHIST_DEF_HTTP_PORT   80
+#define INETHIST_DEF_HTTPS_PORT 443
+
+#define INETHIST_SIZE_LIMIT   1024
+#define INETHIST_MAGIC_HEAD   0x484D4849UL
+
+class INetURLHistory_Impl
+{
+    struct head_entry
+    {
+        /** Representation.
+        */
+        sal_uInt32 m_nMagic;
+        sal_uInt16 m_nNext;
+
+        /** Initialization.
+        */
+        void initialize()
+        {
+            m_nMagic = INETHIST_MAGIC_HEAD;
+            m_nNext  = 0;
+        }
+    };
+
+    struct hash_entry
+    {
+        /** Representation.
+        */
+        sal_uInt32 m_nHash;
+        sal_uInt16 m_nLru;
+
+        /** Initialization.
+        */
+        void initialize (sal_uInt16 nLru)
+        {
+            m_nHash = 0;
+            m_nLru  = nLru;
+        }
+
+        /** Comparison.
+        */
+        bool operator== (sal_uInt32 nHash) const
+        {
+            return (m_nHash == nHash);
+        }
+        bool operator< (sal_uInt32 nHash) const
+        {
+            return (m_nHash < nHash);
+        }
+    };
+
+    struct lru_entry
+    {
+        /** Representation.
+        */
+        sal_uInt32 m_nHash;
+        sal_uInt16 m_nNext;
+        sal_uInt16 m_nPrev;
+
+        /** Initialization.
+        */
+        void initialize (sal_uInt16 nThis)
+        {
+            m_nHash = 0;
+            m_nNext = nThis;
+            m_nPrev = nThis;
+        }
+    };
+
+    /** Representation.
+    */
+    head_entry m_aHead;
+    hash_entry m_pHash[INETHIST_SIZE_LIMIT];
+    lru_entry  m_pList[INETHIST_SIZE_LIMIT];
+
+    /** Initialization.
+    */
+    void initialize();
+
+    static sal_uInt16 capacity()
+    {
+        return sal_uInt16(INETHIST_SIZE_LIMIT);
+    }
+
+    static sal_uInt32 crc32 (OUString const & rData)
+    {
+        return rtl_crc32 (0, rData.getStr(), rData.getLength() * sizeof(sal_Unicode));
+    }
+
+    sal_uInt16 find (sal_uInt32 nHash) const;
+
+    void move (sal_uInt16 nSI, sal_uInt16 nDI);
+
+    void backlink (sal_uInt16 nThis, sal_uInt16 nTail)
+    {
+        lru_entry &rThis = m_pList[nThis];
+        lru_entry &rTail = m_pList[nTail];
+
+        rTail.m_nNext = nThis;
+        rTail.m_nPrev = rThis.m_nPrev;
+        rThis.m_nPrev = nTail;
+        m_pList[rTail.m_nPrev].m_nNext = nTail;
+    }
+
+    void unlink (sal_uInt16 nThis)
+    {
+        lru_entry &rThis = m_pList[nThis];
+
+        m_pList[rThis.m_nPrev].m_nNext = rThis.m_nNext;
+        m_pList[rThis.m_nNext].m_nPrev = rThis.m_nPrev;
+        rThis.m_nNext = nThis;
+        rThis.m_nPrev = nThis;
+    }
+
+public:
+    INetURLHistory_Impl();
+    INetURLHistory_Impl(const INetURLHistory_Impl&) = delete;
+    INetURLHistory_Impl& operator=(const INetURLHistory_Impl&) = delete;
+
+    /** putUrl/queryUrl.
+    */
+    void putUrl   (const OUString &rUrl);
+    bool queryUrl (const OUString &rUrl) const;
+};
+
+INetURLHistory_Impl::INetURLHistory_Impl()
+{
+    initialize();
+}
+
+void INetURLHistory_Impl::initialize()
+{
+    m_aHead.initialize();
+
+    sal_uInt16 i, n = capacity();
+    for (i = 0; i < n; i++)
+        m_pHash[i].initialize(i);
+    for (i = 0; i < n; i++)
+        m_pList[i].initialize(i);
+    for (i = 1; i < n; i++)
+        backlink (m_aHead.m_nNext, i);
+}
+
+sal_uInt16 INetURLHistory_Impl::find (sal_uInt32 nHash) const
+{
+    sal_uInt16 l = 0;
+    sal_uInt16 r = capacity() - 1;
+    sal_uInt16 c = capacity();
+
+    while ((l < r) && (r < c))
+    {
+        sal_uInt16 m = (l + r) / 2;
+        if (m_pHash[m] == nHash)
+            return m;
+
+        if (m_pHash[m] < nHash)
+            l = m + 1;
+        else
+            r = m - 1;
+    }
+    return l;
+}
+
+void INetURLHistory_Impl::move (sal_uInt16 nSI, sal_uInt16 nDI)
+{
+    hash_entry e = m_pHash[nSI];
+    if (nSI < nDI)
+    {
+        // shift left.
+        memmove (
+            &m_pHash[nSI    ],
+            &m_pHash[nSI + 1],
+            (nDI - nSI) * sizeof(hash_entry));
+    }
+    if (nSI > nDI)
+    {
+        // shift right.
+        memmove (
+            &m_pHash[nDI + 1],
+            &m_pHash[nDI    ],
+            (nSI - nDI) * sizeof(hash_entry));
+    }
+    m_pHash[nDI] = e;
+}
+
+void INetURLHistory_Impl::putUrl (const OUString &rUrl)
+{
+    sal_uInt32 h = crc32 (rUrl);
+    sal_uInt16 k = find (h);
+    if ((k < capacity()) && (m_pHash[k] == h))
+    {
+        // Cache hit.
+        sal_uInt16 nMRU = m_pHash[k].m_nLru;
+        if (nMRU != m_aHead.m_nNext)
+        {
+            // Update LRU chain.
+            unlink (nMRU);
+            backlink (m_aHead.m_nNext, nMRU);
+
+            // Rotate LRU chain.
+            m_aHead.m_nNext = m_pList[m_aHead.m_nNext].m_nPrev;
+        }
+    }
+    else
+    {
+        // Cache miss. Obtain least recently used.
+        sal_uInt16 nLRU = m_pList[m_aHead.m_nNext].m_nPrev;
+
+        sal_uInt16 nSI = find (m_pList[nLRU].m_nHash);
+        if (nLRU != m_pHash[nSI].m_nLru)
+        {
+            // Update LRU chain.
+            nLRU = m_pHash[nSI].m_nLru;
+            unlink (nLRU);
+            backlink (m_aHead.m_nNext, nLRU);
+        }
+
+        // Rotate LRU chain.
+        m_aHead.m_nNext = m_pList[m_aHead.m_nNext].m_nPrev;
+
+        // Check source and destination.
+        sal_uInt16 nDI = std::min (k, sal_uInt16(capacity() - 1));
+        if (nSI < nDI && !(m_pHash[nDI] < h))
+            nDI -= 1;
+        if (nDI < nSI && m_pHash[nDI] < h)
+            nDI += 1;
+
+        // Assign data.
+        m_pList[m_aHead.m_nNext].m_nHash = m_pHash[nSI].m_nHash = h;
+        move (nSI, nDI);
+    }
+}
+
+bool INetURLHistory_Impl::queryUrl (const OUString &rUrl) const
+{
+    sal_uInt32 h = crc32 (rUrl);
+    sal_uInt16 k = find (h);
+    // true if cache hit
+    return (k < capacity()) && (m_pHash[k] == h);
+}
+
+INetURLHistory::INetURLHistory() : m_pImpl (new INetURLHistory_Impl())
+{
+}
+
+INetURLHistory::~INetURLHistory()
+{
+}
+
+/*
+ * GetOrCreate.
+ */
+INetURLHistory* INetURLHistory::GetOrCreate()
+{
+    static INetURLHistory instance;
+    return &instance;
+}
+
+void INetURLHistory::NormalizeUrl_Impl (INetURLObject &rUrl)
+{
+    switch (rUrl.GetProtocol())
+    {
+        case INetProtocol::File:
+            if (!INetURLObject::IsCaseSensitive())
+            {
+                OUString aPath (rUrl.GetURLPath(INetURLObject::DecodeMechanism::NONE).toAsciiLowerCase());
+                rUrl.SetURLPath (aPath, INetURLObject::EncodeMechanism::NotCanonical);
+            }
+            break;
+
+        case INetProtocol::Ftp:
+            if (!rUrl.HasPort())
+                rUrl.SetPort (INETHIST_DEF_FTP_PORT);
+            break;
+
+        case INetProtocol::Http:
+            if (!rUrl.HasPort())
+                rUrl.SetPort (INETHIST_DEF_HTTP_PORT);
+            if (!rUrl.HasURLPath())
+                rUrl.SetURLPath(u"/");
+            break;
+
+        case INetProtocol::Https:
+            if (!rUrl.HasPort())
+                rUrl.SetPort (INETHIST_DEF_HTTPS_PORT);
+            if (!rUrl.HasURLPath())
+                rUrl.SetURLPath(u"/");
+            break;
+
+        default:
+            break;
+    }
+}
+
+void INetURLHistory::PutUrl_Impl (const INetURLObject &rUrl)
+{
+    DBG_ASSERT (m_pImpl, "PutUrl_Impl(): no Implementation");
+    if (!m_pImpl)
+        return;
+
+    INetURLObject aHistUrl (rUrl);
+    NormalizeUrl_Impl (aHistUrl);
+
+    m_pImpl->putUrl (aHistUrl.GetMainURL(INetURLObject::DecodeMechanism::NONE));
+    Broadcast (INetURLHistoryHint (&rUrl));
+
+    if (aHistUrl.HasMark())
+    {
+        aHistUrl.SetURL (aHistUrl.GetURLNoMark(INetURLObject::DecodeMechanism::NONE),
+                         INetURLObject::EncodeMechanism::NotCanonical);
+
+        m_pImpl->putUrl (aHistUrl.GetMainURL(INetURLObject::DecodeMechanism::NONE));
+        Broadcast (INetURLHistoryHint (&aHistUrl));
+    }
+}
+
+bool INetURLHistory::QueryUrl(std::u16string_view rUrl) const
+{
+    INetProtocol eProto = INetURLObject::CompareProtocolScheme (rUrl);
+    if (!QueryProtocol (eProto))
+        return false;
+    return QueryUrl_Impl( INetURLObject(rUrl) );
+}
+
+
+bool INetURLHistory::QueryUrl_Impl (INetURLObject rUrl) const
+{
+    DBG_ASSERT (m_pImpl, "QueryUrl_Impl(): no Implementation");
+    if (m_pImpl)
+    {
+        NormalizeUrl_Impl (rUrl);
+
+        return m_pImpl->queryUrl (rUrl.GetMainURL(INetURLObject::DecodeMechanism::NONE));
+    }
+    return false;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */