1 files changed, 188 insertions, 0 deletions
diff --git a/oox/inc/oox/xls/biffcodec.hxx b/oox/inc/oox/xls/biffcodec.hxx
new file mode 100644
index 000000000000..3fc5d77b474e
--- /dev/null
+++ b/oox/inc/oox/xls/biffcodec.hxx
@@ -0,0 +1,188 @@
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: biffcodec.hxx,v $
+ * $Revision: 1.3 $
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef OOX_XLS_BIFFCODEC_HXX
+#define OOX_XLS_BIFFCODEC_HXX
+
+#include <vector>
+#include <comphelper/docpasswordhelper.hxx>
+#include "oox/core/binarycodec.hxx"
+#include "oox/xls/workbookhelper.hxx"
+
+namespace oox {
+namespace xls {
+
+// ============================================================================
+
+const sal_Int64 BIFF_RCF_BLOCKSIZE          = 1024;
+
+// ============================================================================
+
+/** Base class for BIFF stream decoders. */
+class BiffDecoderBase : public ::comphelper::IDocPasswordVerifier
+{
+public:
+    explicit            BiffDecoderBase();
+    virtual             ~BiffDecoderBase();
+
+    /** Derived classes return a clone of the decoder for usage in new streams. */
+    inline BiffDecoderBase* clone() { return implClone(); }
+
+    /** Implementation of the ::comphelper::IDocPasswordVerifier interface,
+        calls the new virtual function implVerify(). */
+    virtual ::comphelper::DocPasswordVerifierResult
+                        verifyPassword( const ::rtl::OUString& rPassword );
+
+    /** Returns true, if the decoder has been initialized correctly. */
+    inline bool         isValid() const { return mbValid; }
+
+    /** Decodes nBytes bytes and writes encrypted data into the buffer pnDestData. */
+    void                decode(
+                            sal_uInt8* pnDestData,
+                            const sal_uInt8* pnSrcData,
+                            sal_Int64 nStreamPos,
+                            sal_uInt16 nBytes );
+
+private:
+    /** Derived classes return a clone of the decoder for usage in new streams. */
+    virtual BiffDecoderBase* implClone() = 0;
+
+    /** Derived classes implement password verification and initialization of
+        the decoder. */
+    virtual bool        implVerify( const ::rtl::OUString& rPassword ) = 0;
+
+    /** Implementation of decryption of a memory block. */
+    virtual void        implDecode(
+                            sal_uInt8* pnDestData,
+                            const sal_uInt8* pnSrcData,
+                            sal_Int64 nStreamPos,
+                            sal_uInt16 nBytes ) = 0;
+
+private:
+    bool                mbValid;        /// True = decoder is correctly initialized.
+};
+
+typedef ::boost::shared_ptr< BiffDecoderBase > BiffDecoderRef;
+
+// ============================================================================
+
+/** Decodes BIFF stream contents that are encoded using the old XOR algorithm. */
+class BiffDecoder_XOR : public BiffDecoderBase
+{
+public:
+    explicit            BiffDecoder_XOR( sal_uInt16 nKey, sal_uInt16 nHash );
+
+private:
+    /** Copy constructor for cloning. */
+                        BiffDecoder_XOR( const BiffDecoder_XOR& rDecoder );
+
+    /** Returns a clone of the decoder for usage in new streams. */
+    virtual BiffDecoder_XOR* implClone();
+
+    /** Implements password verification and initialization of the decoder. */
+    virtual bool        implVerify( const ::rtl::OUString& rPassword );
+
+    /** Implementation of decryption of a memory block. */
+    virtual void        implDecode(
+                            sal_uInt8* pnDestData,
+                            const sal_uInt8* pnSrcData,
+                            sal_Int64 nStreamPos,
+                            sal_uInt16 nBytes );
+
+private:
+    ::oox::core::BinaryCodec_XOR maCodec;   /// Cipher algorithm implementation.
+    ::std::vector< sal_uInt8 > maPassword;
+    sal_uInt16          mnKey;
+    sal_uInt16          mnHash;
+};
+
+// ============================================================================
+
+/** Decodes BIFF stream contents that are encoded using the RC4 algorithm. */
+class BiffDecoder_RCF : public BiffDecoderBase
+{
+public:
+    explicit            BiffDecoder_RCF(
+                            sal_uInt8 pnSalt[ 16 ],
+                            sal_uInt8 pnVerifier[ 16 ],
+                            sal_uInt8 pnVerifierHash[ 16 ] );
+
+private:
+    /** Copy constructor for cloning. */
+                        BiffDecoder_RCF( const BiffDecoder_RCF& rDecoder );
+
+    /** Returns a clone of the decoder for usage in new streams. */
+    virtual BiffDecoder_RCF* implClone();
+
+    /** Implements password verification and initialization of the decoder. */
+    virtual bool        implVerify( const ::rtl::OUString& rPassword );
+
+    /** Implementation of decryption of a memory block. */
+    virtual void        implDecode(
+                            sal_uInt8* pnDestData,
+                            const sal_uInt8* pnSrcData,
+                            sal_Int64 nStreamPos,
+                            sal_uInt16 nBytes );
+
+private:
+    ::oox::core::BinaryCodec_RCF maCodec;   /// Cipher algorithm implementation.
+    ::std::vector< sal_uInt16 > maPassword;
+    ::std::vector< sal_uInt8 > maSalt;
+    ::std::vector< sal_uInt8 > maVerifier;
+    ::std::vector< sal_uInt8 > maVerifierHash;
+};
+
+// ============================================================================
+
+/** Helper for BIFF stream codecs. Holds the used codec object. */
+class BiffCodecHelper : public WorkbookHelper
+{
+public:
+    explicit            BiffCodecHelper( const WorkbookHelper& rHelper );
+
+    /** Implementation helper, reads the FILEPASS and returns a decoder object. */
+    static BiffDecoderRef implReadFilePass( BiffInputStream& rStrm, BiffType eBiff );
+
+    /** Imports the FILEPASS record, asks for a password and sets a decoder at the stream. */
+    bool                importFilePass( BiffInputStream& rStrm );
+    /** Clones the contained decoder object if existing and sets it at the passed stream. */
+    void                cloneDecoder( BiffInputStream& rStrm );
+
+private:
+    BiffDecoderRef      mxDecoder;          /// The decoder for import filter.
+};
+
+// ============================================================================
+
+} // namespace xls
+} // namespace oox
+
+#endif
+