Abstract over Tokens algorithm
Change-Id: I16347d52dd7c102c7bf6a8fd2926e61e6cf75c0b
This commit is contained in:
Stephan Bergmann
parent
6dc48ef517
commit
6ad51a071c
@ -19,6 +19,8 @@
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#include <sal/config.h>
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#include <cassert>
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#include <com/sun/star/ucb/UniversalContentBroker.hpp>
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#include <comphelper/processfactory.hxx>
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#include <unotools/tempfile.hxx>
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@ -159,28 +161,80 @@ OUString ConstructTempDir_Impl( const OUString* pParent )
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return aName;
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}
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class Tokens {
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public:
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virtual bool next(OUString *) = 0;
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protected:
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virtual ~Tokens() {} // avoid warnings
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};
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class SequentialTokens: public Tokens {
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public:
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explicit SequentialTokens(bool showZero): m_value(0), m_show(showZero) {}
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bool next(OUString * token) SAL_OVERRIDE {
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assert(token != 0);
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if (m_value == SAL_MAX_UINT32) {
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return false;
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}
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*token = m_show ? OUString::number(m_value) : OUString();
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++m_value;
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m_show = true;
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return true;
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}
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private:
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sal_uInt32 m_value;
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bool m_show;
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};
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class UniqueTokens: public Tokens {
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public:
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UniqueTokens(): m_count(0) {}
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bool next(OUString * token) SAL_OVERRIDE {
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assert(token != 0);
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// Because of the shared globalValue, no single instance of UniqueTokens
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// is guaranteed to exhaustively test all 36^6 possible values, but stop
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// after that many attempts anyway:
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sal_uInt32 radix = 36;
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sal_uInt32 max = radix * radix * radix * radix * radix * radix;
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// 36^6 == 2'176'782'336 < SAL_MAX_UINT32 == 4'294'967'295
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if (m_count == max) {
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return false;
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}
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sal_uInt32 v;
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{
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osl::MutexGuard g(osl::Mutex::getGlobalMutex());
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globalValue
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= ((globalValue == SAL_MAX_UINT32
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? Time::GetSystemTicks() : globalValue + 1)
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% max);
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v = globalValue;
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}
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*token = OUString::number(v, radix);
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++m_count;
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return true;
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}
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private:
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static sal_uInt32 globalValue;
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sal_uInt32 m_count;
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};
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sal_uInt32 UniqueTokens::globalValue = SAL_MAX_UINT32;
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OUString lcl_createName(
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const OUString& rLeadingChars, unsigned long nSeed, sal_Int16 nRadix,
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bool bFirst, const OUString* pExtension, const OUString* pParent,
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bool bDirectory, bool bKeep, bool bLock)
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const OUString& rLeadingChars, Tokens & tokens, const OUString* pExtension,
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const OUString* pParent, bool bDirectory, bool bKeep, bool bLock)
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{
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// 36 ** 6 == 2176782336
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unsigned long const nMaxRadix = 36;
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unsigned long const nMax = (nMaxRadix*nMaxRadix*nMaxRadix*nMaxRadix*nMaxRadix*nMaxRadix);
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nSeed %= nMax;
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// get correct directory
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OUString aName = ConstructTempDir_Impl( pParent );
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bool bUseNumber = bFirst;
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// now use special naming scheme ( name takes leading chars and an index counting up from zero
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aName += rLeadingChars;
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for ( unsigned long i=nSeed;; )
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OUString aName = ConstructTempDir_Impl( pParent ) + rLeadingChars;;
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OUString token;
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while (tokens.next(&token))
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{
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OUString aTmp( aName );
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if ( bUseNumber )
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aTmp += OUString::number(i, nRadix);
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bUseNumber = true;
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OUString aTmp( aName + token );
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if ( pExtension )
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aTmp += *pExtension;
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else
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@ -230,89 +284,8 @@ OUString lcl_createName(
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return OUString();
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}
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}
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i = (i + 1) % nMax;
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if (i == nSeed) {
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return OUString();
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}
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}
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}
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OUString lcl_createName_BROKEN(
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const OUString& rLeadingChars, sal_Int16 nRadix,
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bool bFirst, const OUString* pExtension, const OUString* pParent,
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bool bDirectory, bool bKeep, bool bLock)
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{
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// 36 ** 6 == 2176782336
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unsigned long const nMaxRadix = 36;
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unsigned long const nMax = (nMaxRadix*nMaxRadix*nMaxRadix*nMaxRadix*nMaxRadix*nMaxRadix);
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static unsigned long nSeed = Time::GetSystemTicks() % nMax;
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// get correct directory
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OUString aName = ConstructTempDir_Impl( pParent );
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bool bUseNumber = bFirst;
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// now use special naming scheme ( name takes leading chars and an index counting up from zero
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aName += rLeadingChars;
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for ( unsigned long i=nSeed;; )
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{
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OUString aTmp( aName );
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if ( bUseNumber )
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aTmp += OUString::number(nSeed, nRadix);
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bUseNumber = true;
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if ( pExtension )
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aTmp += *pExtension;
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else
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aTmp += ".tmp";
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if ( bDirectory )
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{
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FileBase::RC err = Directory::create( aTmp );
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if ( err == FileBase::E_None )
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{
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// !bKeep: only for creating a name, not a file or directory
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if ( bKeep || Directory::remove( aTmp ) == FileBase::E_None )
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return aTmp;
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else
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return OUString();
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}
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else if ( err != FileBase::E_EXIST )
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// if f.e. name contains invalid chars stop trying to create dirs
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return OUString();
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}
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else
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{
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DBG_ASSERT( bKeep, "Too expensive, use directory for creating name!" );
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File aFile( aTmp );
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#ifdef UNX
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/* RW permission for the user only! */
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mode_t old_mode = umask(077);
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#endif
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FileBase::RC err = aFile.open(osl_File_OpenFlag_Create | (bLock ? 0 : osl_File_OpenFlag_NoLock));
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#ifdef UNX
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umask(old_mode);
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#endif
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if ( err == FileBase::E_None || (bLock && err == FileBase::E_NOLCK) )
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{
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aFile.close();
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return aTmp;
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}
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else if ( err != FileBase::E_EXIST )
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{
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// if f.e. name contains invalid chars stop trying to create dirs
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// but if there is a folder with such name proceed further
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DirectoryItem aTmpItem;
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FileStatus aTmpStatus( osl_FileStatus_Mask_Type );
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if ( DirectoryItem::get( aTmp, aTmpItem ) != FileBase::E_None
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|| aTmpItem.getFileStatus( aTmpStatus ) != FileBase::E_None
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|| aTmpStatus.getFileType() != FileStatus::Directory )
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return OUString();
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}
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}
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nSeed = (nSeed + 1) % nMax;
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if (i == nSeed) {
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return OUString();
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}
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}
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return OUString();
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}
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OUString CreateTempName_Impl( const OUString* pParent, bool bKeep, bool bDir = true )
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@ -327,9 +300,8 @@ OUString CreateTempName_Impl( const OUString* pParent, bool bKeep, bool bDir = t
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}
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#endif
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#endif
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return lcl_createName_BROKEN(
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aEyeCatcher, 36, true, 0, pParent, bDir, bKeep,
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false);
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UniqueTokens t;
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return lcl_createName(aEyeCatcher, t, 0, pParent, bDir, bKeep, false);
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}
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OUString TempFile::CreateTempName()
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@ -356,7 +328,8 @@ TempFile::TempFile( const OUString& rLeadingChars, bool _bStartWithZero, const O
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, bIsDirectory( bDirectory )
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, bKillingFileEnabled( false )
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{
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aName = lcl_createName(rLeadingChars, 0, 10, _bStartWithZero, pExtension, pParent, bDirectory, true, true);
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SequentialTokens t(_bStartWithZero);
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aName = lcl_createName(rLeadingChars, t, pExtension, pParent, bDirectory, true, true);
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}
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TempFile::~TempFile()
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