1 files changed, 580 insertions, 0 deletions
diff --git a/library/zstring.h b/library/zstring.h
new file mode 100644
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--- /dev/null
+++ b/library/zstring.h
@@ -0,0 +1,580 @@
+/***************************************************************
+ * Purpose:   High performance string class
+ * Author:    ZenJu (zhnmju123@gmx.de)
+ * Created:   Jan. 2009
+ **************************************************************/
+
+#ifndef ZSTRING_H_INCLUDED
+#define ZSTRING_H_INCLUDED
+
+#include <wx/string.h>
+
+namespace FreeFileSync
+{
+#ifdef FFS_WIN
+    //super fast case-insensitive string comparison: way faster than wxString::CmpNoCase()!!!
+    int compareStringsWin32(const wchar_t* a, const wchar_t* b);
+    int compareStringsWin32(const wchar_t* a, const wchar_t* b, const int aCount, const int bCount);
+#endif  //FFS_WIN
+}
+
+#ifdef FFS_WIN
+#define ZSTRING_WIDE_CHAR //use wide character strings
+
+#elif defined FFS_LINUX
+#define ZSTRING_CHAR //use char strings
+#endif
+
+
+#ifdef ZSTRING_CHAR
+typedef char defaultChar;
+#elif defined ZSTRING_WIDE_CHAR
+typedef wchar_t defaultChar;
+#endif
+
+class Zstring
+{
+public:
+    Zstring();
+    Zstring(const defaultChar* source);                //string is copied: O(length)
+    Zstring(const defaultChar* source, size_t length); //string is copied: O(length)
+    Zstring(const Zstring& source);                    //reference-counting => O(1)
+    Zstring(const wxString& source);                   //string is copied: O(length)
+    ~Zstring();
+
+    operator const defaultChar*() const;               //implicit conversion to C string
+    operator const wxString() const;                   //implicit conversion to wxString
+
+    //wxWidgets functions
+    bool StartsWith(const defaultChar* begin) const;
+    bool StartsWith(const Zstring& begin) const;
+    bool EndsWith(const defaultChar* end) const;
+    bool EndsWith(const Zstring& end) const;
+#ifdef FFS_WIN
+    int CmpNoCase(const defaultChar* other) const;
+    int CmpNoCase(const Zstring& other) const;
+#endif
+    int Cmp(const defaultChar* other) const;
+    int Cmp(const Zstring& other) const;
+    size_t Replace(const defaultChar* old, const defaultChar* replacement, bool replaceAll = true);
+    Zstring AfterLast(defaultChar ch) const;
+    Zstring BeforeLast(defaultChar ch) const;
+    size_t Find(defaultChar ch, bool fromEnd) const;
+    bool Matches(const defaultChar* mask) const;
+    Zstring& Trim(bool fromRight); //from right or left
+    Zstring& MakeLower();
+
+    //std::string functions
+    size_t length() const;
+    const defaultChar* c_str() const;
+    Zstring substr(size_t pos = 0, size_t len = npos) const;
+    bool empty() const;
+    int compare(const defaultChar* other) const;
+    int compare(const Zstring& other) const;
+    int compare(const size_t pos1, const size_t n1, const defaultChar* other) const;
+    size_t find(const defaultChar* str, const size_t pos = 0 ) const;
+    size_t find(const defaultChar ch, const size_t pos = 0) const;
+    size_t rfind(const defaultChar ch, size_t pos = npos) const;
+    Zstring& replace(size_t pos1, size_t n1, const defaultChar* str, size_t n2);
+
+    Zstring& operator=(const Zstring& source);
+    Zstring& operator=(const defaultChar* source);
+
+    bool operator==(const Zstring& other) const;
+    bool operator==(const defaultChar* other) const;
+
+    Zstring& operator+=(const Zstring& other);
+    Zstring& operator+=(const defaultChar* other);
+    Zstring& operator+=(defaultChar ch);
+
+    Zstring operator+(const Zstring& string2) const;
+    Zstring operator+(const defaultChar* string2) const;
+    Zstring operator+(const defaultChar ch) const;
+
+    static const size_t	npos = static_cast<size_t>(-1);
+
+private:
+    void initAndCopy(const defaultChar* source, size_t length);
+    void incRef();                                     //support for reference-counting
+    void decRef();                                     //
+    void copyBeforeWrite(const size_t capacityNeeded); //and copy-on-write
+
+    struct StringDescriptor
+    {
+        StringDescriptor(const unsigned int refC, const size_t len, const size_t cap) : refCount(refC), length(len), capacity(cap) {}
+        unsigned int refCount;
+        size_t       length;
+        size_t       capacity; //allocated length without null-termination
+    };
+    static void allocate(const unsigned int newRefCount, const size_t newLength, const size_t newCapacity, Zstring::StringDescriptor*& newDescr, defaultChar*& newData);
+
+    StringDescriptor* descr;
+    defaultChar*      data;
+};
+
+
+//#######################################################################################
+//begin of implementation
+
+#ifdef ZSTRING_CHAR
+inline
+size_t defaultLength(const char* input)
+{
+    return strlen(input);
+}
+
+inline
+int defaultCompare(const char* str1, const char* str2)
+{
+    return strcmp(str1, str2);
+}
+
+inline
+int defaultCompare(const char* str1, const char* str2, const size_t count)
+{
+    return strncmp(str1, str2, count);
+}
+
+inline
+char* defaultStrFind(const char* str1, const char* str2)
+{
+    return strstr(str1, str2);
+}
+
+inline
+char* defaultStrFind(const char* str1, int ch)
+{
+    return strchr(str1, ch);
+}
+
+inline
+bool defaultIsWhiteSpace(const char ch)
+{
+    // some compilers (e.g. VC++ 6.0) return true for a call to isspace('\xEA') => exclude char(128) to char(255)
+    return (ch < 128) && isspace(ch) != 0;
+}
+
+inline
+char defaultToLower(const char ch)
+{
+    return tolower(ch);
+}
+
+#elif defined ZSTRING_WIDE_CHAR
+inline
+size_t defaultLength(const wchar_t* input)
+{
+    return wcslen(input);
+}
+
+inline
+int defaultCompare(const wchar_t* str1, const wchar_t* str2)
+{
+    return wcscmp(str1, str2);
+}
+
+inline
+int defaultCompare(const wchar_t* str1, const wchar_t* str2, const size_t count)
+{
+    return wcsncmp(str1, str2, count);
+}
+
+inline
+wchar_t* defaultStrFind(const wchar_t* str1, const wchar_t* str2)
+{
+    return wcsstr(str1, str2);
+}
+
+inline
+wchar_t* defaultStrFind(const wchar_t* str1, int ch)
+{
+    return wcschr(str1, ch);
+}
+
+inline
+bool defaultIsWhiteSpace(const wchar_t ch)
+{
+    // some compilers (e.g. VC++ 6.0) return true for a call to isspace('\xEA') => exclude char(128) to char(255)
+    return (ch < 128 || ch > 255) && iswspace(ch) != 0;
+}
+
+inline
+wchar_t defaultToLower(const wchar_t ch)
+{
+    return towlower(ch);
+}
+#endif
+
+
+#ifdef __WXDEBUG__
+extern int allocCount; //test Zstring for memory leaks
+void testZstringForMemoryLeak();
+#endif
+
+
+inline
+void Zstring::allocate(const unsigned int newRefCount,
+                       const size_t       newLength,
+                       const size_t       newCapacity,
+                       StringDescriptor*& newDescr,
+                       defaultChar*&      newData)
+{   //allocate and set data for new string
+    if (newCapacity)
+    {
+        newDescr = (StringDescriptor*) malloc( sizeof(StringDescriptor) + (newCapacity + 1) * sizeof(defaultChar));
+        if (newDescr == NULL)
+            throw; //std::bad_alloc& e
+        newData = (defaultChar*)(newDescr + 1);
+    }
+    else
+    {
+        newDescr = (StringDescriptor*) malloc( sizeof(StringDescriptor));
+        if (newDescr == NULL)
+            throw; //std::bad_alloc& e
+        newData = NULL;
+    }
+
+    newDescr->refCount = newRefCount;
+    newDescr->length   = newLength;
+    newDescr->capacity = newCapacity;
+
+#ifdef __WXDEBUG__
+    ++allocCount; //test Zstring for memory leaks
+
+    static bool isRegistered = false;
+    if (!isRegistered)
+    {
+        isRegistered = true;
+        atexit(testZstringForMemoryLeak);
+    }
+#endif
+}
+
+
+inline
+Zstring::Zstring()
+{
+    allocate(1, 0, 0, descr, data);
+}
+
+
+inline
+Zstring::Zstring(const defaultChar* source)
+{
+    initAndCopy(source, defaultLength(source));
+}
+
+
+inline
+Zstring::Zstring(const defaultChar* source, size_t length)
+{
+    initAndCopy(source, length);
+}
+
+
+inline
+Zstring::Zstring(const Zstring& source)
+{
+    descr = source.descr;
+    data = source.data;
+    incRef(); //reference counting!
+}
+
+
+inline
+Zstring::Zstring(const wxString& source)
+{
+    initAndCopy(source.c_str(), source.length());
+}
+
+
+inline
+Zstring::~Zstring()
+{
+    decRef();
+}
+
+
+inline
+size_t getCapacityToAllocate(const size_t length)
+{
+    return (length + (19 - length % 16)); //allocate some additional length to speed up concatenation
+}
+
+
+inline
+void Zstring::initAndCopy(const defaultChar* source, size_t length)
+{
+    const size_t newCapacity = getCapacityToAllocate(length);
+    allocate(1, length, newCapacity, descr, data);
+    memcpy(data, source, length * sizeof(defaultChar));
+    data[length] = 0;
+}
+
+
+inline
+void Zstring::incRef()
+{
+    assert(descr);
+    ++descr->refCount;
+}
+
+
+inline
+void Zstring::decRef()
+{
+    assert(descr && descr->refCount >= 1);
+    if (--descr->refCount == 0)
+    {
+        assert(descr); //descr points to the begin of the allocated memory block
+        free(descr);   //this must NEVER be changed!! E.g. Trim() relies on descr being start of allocated memory block
+#ifdef __WXDEBUG__
+        --allocCount; //test Zstring for memory leaks
+#endif
+    }
+}
+
+
+#ifdef FFS_WIN
+inline
+int Zstring::CmpNoCase(const defaultChar* other) const
+{
+    return FreeFileSync::compareStringsWin32(c_str(), other); //way faster than wxString::CmpNoCase()!!
+}
+
+
+inline
+int Zstring::CmpNoCase(const Zstring& other) const
+{
+    return FreeFileSync::compareStringsWin32(c_str(), other.c_str()); //way faster than wxString::CmpNoCase()!!
+}
+#endif
+
+
+inline
+Zstring::operator const defaultChar*() const
+{
+    return c_str();
+}
+
+
+inline
+Zstring& Zstring::operator=(const Zstring& source)
+{
+    if (this != &source)
+    {
+        decRef();
+        descr = source.descr;
+        data  = source.data;
+        incRef();
+    }
+    return *this;
+}
+
+
+inline
+size_t Zstring::Find(defaultChar ch, bool fromEnd) const
+{
+    if (fromEnd)
+        return rfind(ch, npos);
+    else
+        return find(ch, 0);
+}
+
+
+// get all characters after the last occurence of ch
+// (returns the whole string if ch not found)
+inline
+Zstring Zstring::AfterLast(defaultChar ch) const
+{
+    size_t pos = rfind(ch, npos);
+    if (pos == npos )
+        return *this;
+    else
+        return c_str() + pos + 1;
+}
+
+
+// get all characters before the last occurence of ch
+// (returns empty string if ch not found)
+inline
+Zstring Zstring::BeforeLast(defaultChar ch) const
+{
+    size_t pos = rfind(ch, npos);
+
+    if (pos != npos && pos != 0 )
+        return Zstring(data, pos); //data is non-empty string in this context: else ch would not have been found!
+    else
+        return Zstring();
+}
+
+
+inline
+bool Zstring::StartsWith(const defaultChar* begin) const
+{
+    const size_t beginLength = defaultLength(begin);
+    if (length() < beginLength)
+        return false;
+    return compare(0, beginLength, begin) == 0;
+}
+
+
+inline
+bool Zstring::StartsWith(const Zstring& begin) const
+{
+    const size_t beginLength = begin.length();
+    if (length() < beginLength)
+        return false;
+    return compare(0, beginLength, begin) == 0;
+}
+
+
+inline
+bool Zstring::EndsWith(const defaultChar* end) const
+{
+    const size_t thisLength = length();
+    const size_t endLength  = defaultLength(end);
+    if (thisLength < endLength)
+        return false;
+    return compare(thisLength - endLength, endLength, end) == 0;
+}
+
+
+inline
+bool Zstring::EndsWith(const Zstring& end) const
+{
+    const size_t thisLength = length();
+    const size_t endLength  = end.length();
+    if (thisLength < endLength)
+        return false;
+    return compare(thisLength - endLength, endLength, end) == 0;
+}
+
+
+inline
+size_t Zstring::find(const defaultChar* str, const size_t pos) const
+{
+    assert(pos <= length());
+    const defaultChar* thisStr = c_str();
+    const defaultChar* found = defaultStrFind(thisStr + pos, str);
+    return found == NULL ? npos : found - thisStr;
+}
+
+
+inline
+size_t Zstring::find(const defaultChar ch, const size_t pos) const
+{
+    assert(pos <= length());
+    const defaultChar* thisStr = c_str();
+    const defaultChar* found = defaultStrFind(thisStr + pos, ch);
+    return found == NULL ? npos : found - thisStr;
+}
+
+
+inline
+Zstring::operator const wxString() const
+{
+    return wxString(c_str());
+}
+
+
+inline
+int Zstring::Cmp(const defaultChar* other) const
+{
+    return compare(other);
+}
+
+
+inline
+int Zstring::Cmp(const Zstring& other) const
+{
+    return defaultCompare(c_str(), other.c_str()); //overload using strcmp(char*, char*) should be fastest!
+}
+
+
+inline
+bool Zstring::operator==(const Zstring& other) const
+{
+    return defaultCompare(c_str(), other.c_str()) == 0; //overload using strcmp(char*, char*) should be fastest!
+}
+
+
+inline
+bool Zstring::operator==(const defaultChar* other) const
+{
+    return compare(other) == 0;
+}
+
+
+inline
+int Zstring::compare(const Zstring& other) const
+{
+    return defaultCompare(c_str(), other.c_str()); //overload using strcmp(char*, char*) should be fastest!
+}
+
+
+inline
+int Zstring::compare(const defaultChar* other) const
+{
+    return defaultCompare(c_str(), other); //overload using strcmp(char*, char*) should be fastest!
+}
+
+
+inline
+int Zstring::compare(const size_t pos1, const size_t n1, const defaultChar* other) const
+{
+    assert(length() - pos1 >= n1);
+    return defaultCompare(c_str() + pos1, other, n1);
+}
+
+
+inline
+size_t Zstring::length() const
+{
+    return descr->length;
+}
+
+
+inline
+const defaultChar* Zstring::c_str() const
+{
+    if (length())
+        return data;
+    else
+#ifdef ZSTRING_CHAR
+        return "";
+#elif defined ZSTRING_WIDE_CHAR
+        return L"";
+#endif
+}
+
+
+inline
+bool Zstring::empty() const
+{
+    return length() == 0;
+}
+
+
+inline
+Zstring Zstring::operator+(const Zstring& string2) const
+{
+    return Zstring(*this)+=string2;
+}
+
+
+inline
+Zstring Zstring::operator+(const defaultChar* string2) const
+{
+    return Zstring(*this)+=string2;
+}
+
+
+inline
+Zstring Zstring::operator+(const defaultChar ch) const
+{
+    return Zstring(*this)+=ch;
+}
+
+
+#endif // ZSTRING_H_INCLUDED