fdo#88810 avoid unnecessary massive O(U)String allocations in XLSX export

Change-Id: Ie6a024463e7ee9b0f4492b2431533708a578faf0

sc/inc/address.hxx

@@ -325,6 +325,9 @@ public:
                     ExternalInfo* pExtInfo = NULL,
                     const css::uno::Sequence<css::sheet::ExternalLinkInfo>* pExternalLinks = NULL );
 
+    SC_DLLPUBLIC bool TryFormat( char * s, sal_uInt16 nFlags = 0,
+                                  const ScDocument* pDocument = NULL,
+                                  const Details& rDetails = detailsOOOa1) const;
     SC_DLLPUBLIC OUString Format( sal_uInt16 nFlags = 0,
                                   const ScDocument* pDocument = NULL,
                                   const Details& rDetails = detailsOOOa1) const;

sc/source/core/tool/address.cxx

@@ -1745,6 +1745,51 @@ static OUString getFileNameFromDoc( const ScDocument* pDoc )
     return sFileName;
 }
 
+/** Tries to obtain a simple address without OUString/OString allocation
+ *
+ *  @returns TRUE at success (it is enough to call OUString Format() at FALSE)
+ *
+ */
+
+bool ScAddress::TryFormat(char * s, sal_uInt16 nFlags, const ScDocument* pDoc,
+                           const Details& rDetails) const
+{
+    if( nFlags & SCA_VALID )
+        nFlags |= ( SCA_VALID_ROW | SCA_VALID_COL | SCA_VALID_TAB );
+    if(( pDoc && (nFlags & SCA_VALID_TAB ) && ( nTab >= pDoc->GetTableCount() || ( nFlags & SCA_TAB_3D ))) ||
+         ! (nFlags & SCA_VALID_COL) || ! (nFlags & SCA_VALID_ROW) ||
+            (nFlags & SCA_COL_ABSOLUTE) != 0 || (nFlags & SCA_ROW_ABSOLUTE) != 0 )
+    {
+       return false;
+    }
+
+    switch( rDetails.eConv )
+    {
+    default :
+    // Note: length of s (defined by SIMPLEADDRESSLEN) supports the following simple addresses
+    case formula::FormulaGrammar::CONV_OOO:
+    case formula::FormulaGrammar::CONV_XL_A1:
+    case formula::FormulaGrammar::CONV_XL_OOX:
+        if (nCol >= 26 * 26)
+            // TODO: extend it for full column range
+            return false;
+        if( nCol < 26 )
+            *s = 'A' + nCol;
+        else
+        {
+            *s = 'A' + nCol / 26 - 1;
+            s++;
+            *s = 'A' + nCol % 26;
+        }
+        sprintf(s + 1, "%d", nRow + 1);
+        break;
+    case formula::FormulaGrammar::CONV_XL_R1C1:
+        // not used in XLSX export
+        return false;
+    }
+    return true;
+}
+
 OUString ScAddress::Format(sal_uInt16 nFlags, const ScDocument* pDoc,
                            const Details& rDetails) const
 {

sc/source/filter/excel/xestream.cxx

@@ -718,6 +718,11 @@ OString XclXmlUtils::ToOString( const OUString& s )
     return OUStringToOString( s, RTL_TEXTENCODING_UTF8  );
 }
 
+bool XclXmlUtils::TryToChar( char * s, const ScAddress& rAddress )
+{
+    return rAddress.TryFormat(s, SCA_VALID, NULL, ScAddress::Details( FormulaGrammar::CONV_XL_A1));
+}
+
 OString XclXmlUtils::ToOString( const ScAddress& rAddress )
 {
     OUString sAddress(rAddress.Format(SCA_VALID, NULL, ScAddress::Details( FormulaGrammar::CONV_XL_A1)));
@@ -760,6 +765,11 @@ static ScAddress lcl_ToAddress( const XclAddress& rAddress )
     return aAddress;
 }
 
+bool XclXmlUtils::TryToChar( sal_Char * s, const XclAddress& rAddress )
+{
+    return TryToChar( s, lcl_ToAddress( rAddress ));
+}
+
 OString XclXmlUtils::ToOString( const XclAddress& rAddress )
 {
     return ToOString( lcl_ToAddress( rAddress ) );

sc/source/filter/excel/xetable.cxx

@@ -41,6 +41,11 @@ using namespace ::oox;
 
 namespace ApiScriptType = ::com::sun::star::i18n::ScriptType;
 
+// max string length of simple addresses (eg. ABC1000000\0)
+#if MAXROWCOUNT_DEFINE < 9999999
+#define SIMPLEADDRESSLEN 11
+#endif
+
 // Helper records for cell records
 
 XclExpStringRec::XclExpStringRec( const XclExpRoot& rRoot, const OUString& rResult ) :
@@ -630,9 +635,10 @@ static OString lcl_GetStyleId( XclExpXmlStream& rStrm, const XclExpCellBase& rCe
 
 void XclExpNumberCell::SaveXml( XclExpXmlStream& rStrm )
 {
+    char fastAdr[SIMPLEADDRESSLEN];
     sax_fastparser::FSHelperPtr& rWorksheet = rStrm.GetCurrentStream();
     rWorksheet->startElement( XML_c,
-            XML_r,      XclXmlUtils::ToOString( GetXclPos() ).getStr(),
+            XML_r,      XclXmlUtils::TryToChar( fastAdr, GetXclPos() ) ? fastAdr : XclXmlUtils::ToOString( GetXclPos() ).getStr(),
             XML_s,      lcl_GetStyleId( rStrm, *this ).getStr(),
             XML_t,      "n",
             // OOXTODO: XML_cm, XML_vm, XML_ph
@@ -923,11 +929,12 @@ void XclExpFormulaCell::SaveXml( XclExpXmlStream& rStrm )
 {
     const char* sType = NULL;
     OUString    sValue;
+    char fastAdr[SIMPLEADDRESSLEN];
 
     XclXmlUtils::GetFormulaTypeAndValue( mrScFmlaCell, sType, sValue );
     sax_fastparser::FSHelperPtr& rWorksheet = rStrm.GetCurrentStream();
     rWorksheet->startElement( XML_c,
-            XML_r,      XclXmlUtils::ToOString( GetXclPos() ).getStr(),
+            XML_r,      XclXmlUtils::TryToChar( fastAdr, GetXclPos() ) ? fastAdr : XclXmlUtils::ToOString( GetXclPos() ).getStr(),
             XML_s,      lcl_GetStyleId( rStrm, *this ).getStr(),
             XML_t,      sType,
             // OOXTODO: XML_cm, XML_vm, XML_ph
@@ -1307,9 +1314,10 @@ bool XclExpRkCell::TryMerge( const XclExpCellBase& rCell )
 
 void XclExpRkCell::WriteXmlContents( XclExpXmlStream& rStrm, const XclAddress& rAddress, sal_uInt32 nXFId, sal_uInt16 nRelCol )
 {
+    char fastAdr[SIMPLEADDRESSLEN];
     sax_fastparser::FSHelperPtr& rWorksheet = rStrm.GetCurrentStream();
     rWorksheet->startElement( XML_c,
-            XML_r,      XclXmlUtils::ToOString( rAddress ).getStr(),
+            XML_r,      XclXmlUtils::TryToChar( fastAdr, rAddress ) ? fastAdr : XclXmlUtils::ToOString( rAddress ).getStr(),
             XML_s,      lcl_GetStyleId( rStrm, nXFId ).getStr(),
             XML_t,      "n",
             // OOXTODO: XML_cm, XML_vm, XML_ph

sc/source/filter/inc/xestream.hxx

@@ -266,9 +266,11 @@ public:
     static OString ToOString( const Color& rColor );
     static OString ToOString( const OUString& s );
     static OString ToOString( const ScfUInt16Vec& rBuffer );
+    static bool TryToChar( char * s, const ScAddress& rRange );
     static OString ToOString( const ScAddress& rRange );
     static OString ToOString( const ScRange& rRange );
     static OString ToOString( const ScRangeList& rRangeList );
+    static bool TryToChar( char * s, const XclAddress& rAddress );
     static OString ToOString( const XclAddress& rAddress );
     static OString ToOString( const XclExpString& s );
     static OString ToOString( const XclRange& rRange );