Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 1955 insertions, 0 deletions

diff --git a/mimelib/dwstring.cpp b/mimelib/dwstring.cpp
new file mode 100644
index 000000000..cd3c7b1ab
--- /dev/null
+++ b/mimelib/dwstring.cpp
@@ -0,0 +1,1955 @@
+//=============================================================================
+// File:       dwstring.cpp
+// Contents:   Definitions for DwString
+// Maintainer: Doug Sauder <[email protected]>
+// WWW:        http://www.fwb.gulf.net/~dwsauder/mimepp.html
+//
+// Copyright (c) 1996, 1997 Douglas W. Sauder
+// All rights reserved.
+//
+// IN NO EVENT SHALL DOUGLAS W. SAUDER BE LIABLE TO ANY PARTY FOR DIRECT,
+// INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+// THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF DOUGLAS W. SAUDER
+// HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// DOUGLAS W. SAUDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT
+// NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+// PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+// BASIS, AND DOUGLAS W. SAUDER HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+// SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+//
+//=============================================================================
+
+#define DW_IMPLEMENTATION
+
+#include <mimelib/config.h>
+#include <mimelib/debug.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <new>
+#include <mimelib/string.h>
+
+// mmap
+#include <unistd.h>
+#include <sys/mman.h>
+
+
+#define DW_MIN(a,b) ((a) <= (b) ? (a) : (b))
+#define DW_MAX(a,b) ((a) >= (b) ? (a) : (b))
+
+/* In some locales (such as tr_TR.UTF-8, az_AZ) using tolower() can cause
+   unexpected results. Keywords must be compared in a
+   locale-independent manner */
+static char dw_asciitolower( const char c )
+{
+  if ( c >= 'A' && c <= 'Z' )
+    return c - 'A' + 'a';
+  else
+    return c;
+}
+
+static char dw_asciitoupper( const char c )
+{
+  if ( c >= 'a' && c <= 'z' )
+    return c - 'a' + 'A';
+  else
+    return c;
+}
+
+static int dw_strasciicasecmp(const char* s1, size_t len1, const char* s2,
+    size_t len2)
+{
+    assert(s1 != 0);
+    assert(s2 != 0);
+    size_t len = DW_MIN(len1, len2);
+    for (size_t i=0; i < len; ++i) {
+        int c1 = dw_asciitolower( s1[i] );
+        int c2 = dw_asciitolower( s2[i] );
+
+        if ( c1 < c2 )
+            return -1;
+        else if ( c1 > c2 )
+            return 1;
+    }
+    if (len1 < len2) {
+        return -1;
+    }
+    else if (len1 > len2) {
+        return 1;
+    }
+    return 0;
+}
+
+#if 0
+static int dw_strcasecmp(const char* s1, size_t len1, const char* s2,
+    size_t len2)
+{
+    assert(s1 != 0);
+    assert(s2 != 0);
+    size_t len = DW_MIN(len1, len2);
+    for (size_t i=0; i < len; ++i) {
+        int c1 = tolower(s1[i]);
+        int c2 = tolower(s2[i]);
+        if (c1 < c2) {
+            return -1;
+        }
+        else if (c1 > c2) {
+            return 1;
+        }
+    }
+    if (len1 < len2) {
+        return -1;
+    }
+    else if (len1 > len2) {
+        return 1;
+    }
+    return 0;
+}
+#endif
+
+
+static int dw_strcmp(const char* s1, size_t len1, const char* s2, size_t len2)
+{
+    assert(s1 != 0);
+    assert(s2 != 0);
+    size_t len = DW_MIN(len1, len2);
+    for (size_t i=0; i < len; ++i) {
+        if (s1[i] < s2[i]) {
+            return -1;
+        }
+        else if (s1[i] > s2[i]) {
+            return 1;
+        }
+    }
+    if (len1 < len2) {
+        return -1;
+    }
+    else if (len1 > len2) {
+        return 1;
+    }
+    return 0;
+}
+
+
+// Copy
+
+inline void mem_copy(const char* src, size_t n, char* dest)
+{
+    assert(src != 0);
+    assert(dest != 0);
+    assert(src != dest);
+    if (n == 0 || src == dest || !src || !dest) return;
+    memmove(dest, src, n);
+}
+
+#if !defined(DW_USE_ANSI_STRING)
+
+
+// Allocate buffer whose size is a power of 2
+
+static char* mem_alloc(size_t* aSize)
+{
+    assert(aSize != 0);
+    // minimum size is 32
+    size_t size = 32;
+    while (size < *aSize) {
+        size <<= 1;
+    }
+    *aSize = 0;
+    char* buf = new char[size];
+    if (buf != 0)
+        *aSize = size;
+    return buf;
+}
+
+
+// Free buffer
+
+inline void mem_free(char* buf)
+{
+    assert(buf != 0);
+    if (buf && buf != DwString::sEmptyBuffer)
+        delete [] buf;
+}
+
+
+inline DwStringRep* new_rep_reference(DwStringRep* rep)
+{
+    assert(rep != 0);
+    ++rep->mRefCount;
+    return rep;
+}
+
+
+inline void delete_rep_safely(DwStringRep* rep)
+{
+    assert(rep != 0);
+#if defined(DW_DEBUG_VERSION) || defined(DW_DEVELOPMENT_VERSION)
+    if (rep->mRefCount <= 0) {
+        std::cerr << "Error: attempt to delete a DwStringRep "
+            "with ref count <= 0" << std::endl;
+        std::cerr << "(Possibly 'delete' was called twice for same object)"
+            << std::endl;
+        abort();
+    }
+#endif //  defined(DW_DEBUG_VERSION) || defined(DW_DEVELOPMENT_VERSION)
+    --rep->mRefCount;
+    if (rep->mRefCount == 0) {
+        delete rep;
+    }
+}
+
+
+//--------------------------------------------------------------------------
+
+
+//DwStringRep* DwStringRep::theirPool = NULL;
+//int DwStringRep::theirPoolCount = 0;
+
+
+// DwStringRep takes ownership of the buffer passed as an argument
+
+DwStringRep::DwStringRep(char* aBuf, size_t aSize)
+{
+    assert(aBuf != 0);
+    mSize = aSize;
+    mBuffer = aBuf;
+    mRefCount = 1;
+    mPageMod = 0;
+}
+
+DwStringRep::DwStringRep(FILE* aFile, size_t aSize)
+{
+    assert(aFile != 0);
+    static int pagesize = -1;
+    if (pagesize < 0)
+	pagesize = getpagesize();
+    assert(pagesize != 0);
+    int tell = ftell(aFile);
+    mPageMod = tell % pagesize;
+    mSize = aSize;
+    mRefCount = 1;
+
+    mBuffer = (char *)mmap(0, aSize + mPageMod, PROT_READ, MAP_SHARED, fileno(aFile), tell - mPageMod) + mPageMod;
+    ++mPageMod;
+    if (mBuffer == MAP_FAILED) {
+	mBuffer = 0;
+	mSize = 0;
+	mPageMod = 0;
+    }
+}
+
+
+DwStringRep::~DwStringRep()
+{
+#if defined (DW_DEBUG_VERSION) || defined (DW_DEVELOPMENT_VERSION)
+    if (mBuffer == 0) {
+        std::cerr << "DwStringRep destructor called for bad DwStringRep object"
+            << std::endl;
+        std::cerr << "(Possibly 'delete' was called twice for same object)"
+            << std::endl;
+        abort();
+    }
+#endif //  defined (DW_DEBUG_VERSION) || defined (DW_DEVELOPMENT_VERSION)
+    if (mPageMod) {
+	--mPageMod;
+	munmap(mBuffer - mPageMod, mSize + mPageMod);
+    } else {
+	mem_free(mBuffer);
+    }
+    //DEV_STMT(mBuffer = 0)
+}
+
+
+void DwStringRep::CheckInvariants() const
+{
+#if defined (DW_DEBUG_VERSION)
+    assert(mBuffer != 0);
+    assert(mSize > 0);
+    assert(mRefCount > 0);
+#endif // defined (DW_DEBUG_VERSION)
+}
+
+
+// Efficient memory management.  May be used at some point in the future.
+
+#if 0
+void* DwStringRep::operator new(size_t sz)
+{
+    void* rep;
+    if (theirPoolCount > 0) {
+        --theirPoolCount;
+        rep = theirPool;
+        theirPool = theirPool->mNext;
+    }
+    else {
+        rep = new char[sz];
+    }
+    return rep;
+}
+
+
+void DwStringRep::operator delete(void* aRep, size_t)
+{
+    if (theirPoolCount < 200) {
+        DwStringRep* rep = (DwStringRep*) aRep;
+        ++theirPoolCount;
+        rep->mNext = theirPool;
+        theirPool = rep;
+    }
+    else {
+        delete [] (char*) aRep;
+    }
+}
+#endif
+
+
+//--------------------------------------------------------------------------
+
+const size_t DwString::kEmptyBufferSize = 4;
+char DW_EXPORT DwString::sEmptyBuffer[]="    ";
+DwStringRep* DwString::sEmptyRep = 0;
+
+const size_t DwString::npos = (size_t) -1;
+
+DwString::DwString()
+{
+    if (sEmptyRep == 0) {
+        sEmptyBuffer[0] = 0;
+        sEmptyRep = new DwStringRep(sEmptyBuffer, kEmptyBufferSize);
+        assert(sEmptyRep != 0);
+    }
+    DBG_STMT(sEmptyRep->CheckInvariants())
+    mRep = new_rep_reference(sEmptyRep);
+    mStart = 0;
+    mLength = 0;
+}
+
+
+DwString::DwString(const DwString& aStr, size_t aPos, size_t aLen)
+{
+    assert(aPos <= aStr.mLength);
+    if (sEmptyRep == 0) {
+        sEmptyBuffer[0] = 0;
+        sEmptyRep = new DwStringRep(sEmptyBuffer, kEmptyBufferSize);
+        assert(sEmptyRep != 0);
+    }
+    DBG_STMT(aStr.CheckInvariants())
+    size_t pos = DW_MIN(aPos, aStr.mLength);
+    size_t len = DW_MIN(aLen, aStr.mLength - pos);
+    if (len > 0) {
+        mRep = new_rep_reference(aStr.mRep);
+        mStart = aStr.mStart + pos;
+        mLength = len;
+    }
+    else /* if (len == 0) */ {
+        mRep = new_rep_reference(sEmptyRep);
+        mStart = 0;
+        mLength = 0;
+    }
+}
+
+
+DwString::DwString(const char* aBuf, size_t aLen)
+{
+    assert(aBuf != 0);
+    assert(aLen != (size_t)-1);
+    if (sEmptyRep == 0) {
+        sEmptyBuffer[0] = 0;
+        sEmptyRep = new DwStringRep(sEmptyBuffer, kEmptyBufferSize);
+        assert(sEmptyRep != 0);
+    }
+    DBG_STMT(sEmptyRep->CheckInvariants())
+    // Set valid values, in case an exception is thrown
+    mRep = new_rep_reference(sEmptyRep);
+    mStart = 0;
+    mLength = 0;
+    _replace(0, mLength, aBuf, aLen);
+}
+
+
+DwString::DwString(FILE* aFile , size_t aLen)
+{
+    assert(aFile != 0);
+    assert(aLen != (size_t)-1);
+    if (sEmptyRep == 0) {
+        sEmptyBuffer[0] = 0;
+        sEmptyRep = new DwStringRep(sEmptyBuffer, kEmptyBufferSize);
+        assert(sEmptyRep != 0);
+    }
+    DBG_STMT(sEmptyRep->CheckInvariants())
+    // Set valid values, in case an exception is thrown
+    mRep = new DwStringRep(aFile, aLen);
+    mStart = 0;
+    mLength = aLen;
+}
+
+
+DwString::DwString(const char* aCstr)
+{
+    if (sEmptyRep == 0) {
+        sEmptyBuffer[0] = 0;
+        sEmptyRep = new DwStringRep(sEmptyBuffer, kEmptyBufferSize);
+        assert(sEmptyRep != 0);
+    }
+    DBG_STMT(sEmptyRep->CheckInvariants())
+    // Set valid values, in case an exception is thrown
+    mRep = new_rep_reference(sEmptyRep);
+    mStart = 0;
+    mLength = 0;
+    if ( aCstr ) {
+        size_t len = (aCstr) ? strlen(aCstr) : 0;
+        _replace(0, mLength, aCstr, len);
+    }
+}
+
+
+DwString::DwString(size_t aLen, char aChar)
+{
+    assert(aLen != (size_t)-1);
+    if (sEmptyRep == 0) {
+        sEmptyBuffer[0] = 0;
+        sEmptyRep = new DwStringRep(sEmptyBuffer, kEmptyBufferSize);
+        assert(sEmptyRep != 0);
+    }
+    DBG_STMT(sEmptyRep->CheckInvariants())
+    // Set valid values, in case an exception is thrown
+    mRep = new_rep_reference(sEmptyRep);
+    mStart = 0;
+    mLength = 0;
+    _replace(0, mLength, aLen, aChar);
+}
+
+
+DwString::DwString(char* aBuf, size_t aSize, size_t aStart, size_t aLen)
+{
+    assert(aBuf != 0);
+    assert(aSize > 0);
+    assert(aLen < aSize);
+    assert(aStart < aSize - aLen);
+    if (sEmptyRep == 0) {
+        sEmptyBuffer[0] = 0;
+        sEmptyRep = new DwStringRep(sEmptyBuffer, kEmptyBufferSize);
+        assert(sEmptyRep != 0);
+    }
+    DBG_STMT(sEmptyRep->CheckInvariants())
+    // Set valid values, in case an exception is thrown
+    mRep = new_rep_reference(sEmptyRep);
+    mStart = 0;
+    mLength = 0;
+    DwStringRep* rep = new DwStringRep(aBuf, aSize);
+    assert(rep != 0);
+    if (rep != 0) {
+        mRep = rep;
+        mStart = aStart;
+        mLength = aLen;
+    }
+    else /* if (rep == 0) */ {
+        delete [] aBuf;
+    }
+}
+
+
+DwString::~DwString()
+{
+    assert(mRep != 0);
+    delete_rep_safely(mRep);
+    DEV_STMT(mRep = 0)
+}
+
+
+size_t DwString::max_size() const
+{
+    return ((size_t)-1) - 1;
+}
+
+
+void DwString::resize(size_t aLen, char aChar)
+{
+    // making string shorter?
+    if (aLen < mLength) {
+        mLength = aLen;
+        if (mRep->mRefCount == 1) {
+            mRep->mBuffer[mStart + aLen] = 0;
+        }
+    }
+    // expanding string
+    else if (aLen > mLength) {
+        _replace(mLength, 0, aLen-mLength, aChar);
+    }
+}
+
+
+void DwString::resize(size_t aLen)
+{
+    resize(aLen, 0);
+}
+
+
+void DwString::reserve(size_t aSize)
+{
+    if (mRep->mRefCount == 1 && aSize < mRep->mSize && mRep != sEmptyRep) {
+        return;
+    }
+    size_t size = aSize + 1;
+    char* newBuf = mem_alloc(&size);
+    assert(newBuf != 0);
+    if (newBuf != 0) {
+        char* to = newBuf;
+        const char* from = mRep->mBuffer + mStart;
+        mem_copy(from, mLength, to);
+        to[mLength] = 0;
+        DwStringRep* rep= new DwStringRep(newBuf, size);
+        assert(rep != 0);
+        if (rep != 0) {
+            delete_rep_safely(mRep);
+            mRep = rep;
+            mStart = 0;
+        }
+        else {
+             mem_free(newBuf);
+        }
+    }
+}
+
+
+void DwString::clear()
+{
+    assign("");
+}
+
+
+DwString& DwString::append(const DwString& aStr)
+{
+    return append(aStr, 0, aStr.mLength);
+}
+
+
+DwString& DwString::append(const DwString& aStr, size_t aPos,
+    size_t aLen)
+{
+    assert(aPos <= aStr.mLength);
+    size_t pos = DW_MIN(aPos, aStr.mLength);
+    size_t len = DW_MIN(aLen, aStr.mLength - pos);
+    if (&aStr == this) {
+        DwString temp(aStr);
+        _replace(mLength, 0, &temp.mRep->mBuffer[temp.mStart+pos], len);
+    }
+    else {
+        _replace(mLength, 0, &aStr.mRep->mBuffer[aStr.mStart+pos], len);
+    }
+    return *this;
+}
+
+
+DwString& DwString::append(const char* aBuf, size_t aLen)
+{
+    assert(aBuf != 0);
+    if (aBuf != 0) {
+        _replace(mLength, 0, aBuf, aLen);
+    }
+    return *this;
+}
+
+
+DwString& DwString::append(const char* aCstr)
+{
+    assert(aCstr != 0);
+    size_t len = (aCstr) ? strlen(aCstr) : 0;
+    _replace(mLength, 0, aCstr, len);
+    return *this;
+}
+
+
+DwString& DwString::append(size_t aLen, char aChar)
+{
+    _replace(mLength, 0, aLen, aChar);
+    return *this;
+}
+
+
+DwString& DwString::assign(const DwString& aStr)
+{
+    if (this != &aStr) {
+        assign(aStr, 0, aStr.mLength);
+    }
+    return *this;
+}
+
+
+DwString& DwString::assign(const DwString& aStr, size_t aPos, size_t aLen)
+{
+    assert(aPos <= aStr.mLength);
+    size_t pos = DW_MIN(aPos, aStr.mLength);
+    size_t len = DW_MIN(aLen, aStr.mLength - pos);
+    if (mRep == aStr.mRep) {
+        mStart = aStr.mStart + pos;
+        mLength = len;
+    }
+    else {
+        delete_rep_safely(mRep);
+        mRep = new_rep_reference(aStr.mRep);
+        mStart = aStr.mStart + pos;
+        mLength = len;
+    }
+    return *this;
+}
+
+
+DwString& DwString::assign(const char* aBuf, size_t aLen)
+{
+    assert(aBuf != 0);
+    assert(aLen != (size_t)-1);
+    _replace(0, mLength, aBuf, aLen);
+    return *this;
+}
+
+
+DwString& DwString::assign(const char* aCstr)
+{
+    assert(aCstr != 0);
+    size_t len = (aCstr) ? strlen(aCstr) : 0;
+    _replace(0, mLength, aCstr, len);
+    return *this;
+}
+
+
+DwString& DwString::assign(size_t aLen, char aChar)
+{
+    assert(aLen != (size_t)-1);
+    _replace(0, mLength, aLen, aChar);
+    return *this;
+}
+
+
+DwString& DwString::insert(size_t aPos, const DwString& aStr)
+{
+    return insert(aPos, aStr, 0, aStr.mLength);
+}
+
+
+DwString& DwString::insert(size_t aPos1, const DwString& aStr,
+    size_t aPos2, size_t aLen2)
+{
+    assert(aPos1 <= mLength);
+    assert(aPos2 <= aStr.mLength);
+    size_t pos2 = DW_MIN(aPos2, aStr.mLength);
+    size_t len2 = DW_MIN(aLen2, aStr.mLength - pos2);
+    if (&aStr == this) {
+        DwString temp(aStr);
+        _replace(aPos1, 0, &temp.mRep->mBuffer[temp.mStart+pos2], len2);
+    }
+    else {
+        _replace(aPos1, 0, &aStr.mRep->mBuffer[aStr.mStart+pos2], len2);
+    }
+    return *this;
+}
+
+
+DwString& DwString::insert(size_t aPos, const char* aBuf, size_t aLen)
+{
+    assert(aBuf != 0);
+    _replace(aPos, 0, aBuf, aLen);
+    return *this;
+}
+
+
+DwString& DwString::insert(size_t aPos, const char* aCstr)
+{
+    assert(aCstr != 0);
+    size_t len = (aCstr) ? strlen(aCstr) : 0;
+    _replace(aPos, 0, aCstr, len);
+    return *this;
+}
+
+
+DwString& DwString::insert(size_t aPos, size_t aLen, char aChar)
+{
+    _replace(aPos, 0, aLen, aChar);
+    return *this;
+}
+
+
+DwString& DwString::erase(size_t aPos, size_t aLen)
+{
+    assert(aPos <= mLength);
+    size_t pos = DW_MIN(aPos, mLength);
+    size_t len = DW_MIN(aLen, mLength - pos);
+    _replace(pos, len, "", 0);
+    return *this;
+}
+
+
+DwString& DwString::replace(size_t aPos1, size_t aLen1, const DwString& aStr)
+{
+    return replace(aPos1, aLen1, aStr, 0, aStr.mLength);
+}
+
+
+DwString& DwString::replace(size_t aPos1, size_t aLen1, const DwString& aStr,
+    size_t aPos2, size_t aLen2)
+{
+    assert(aPos2 <= aStr.mLength);
+    size_t pos2 = DW_MIN(aPos2, aStr.mLength);
+    size_t len2 = DW_MIN(aLen2, aStr.mLength - pos2);
+    if (&aStr == this) {
+        DwString temp(aStr);
+        _replace(aPos1, aLen1, &temp.mRep->mBuffer[temp.mStart+pos2], len2);
+    }
+    else {
+        _replace(aPos1, aLen1, &aStr.mRep->mBuffer[aStr.mStart+pos2], len2);
+    }
+    return *this;
+}
+
+
+DwString& DwString::replace(size_t aPos1, size_t aLen1, const char* aBuf,
+    size_t aLen2)
+{
+    _replace(aPos1, aLen1, aBuf, aLen2);
+    return *this;
+}
+
+
+DwString& DwString::replace(size_t aPos1, size_t aLen1, const char* aCstr)
+{
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    _replace(aPos1, aLen1, aCstr, len2);
+    return *this;
+}
+
+
+DwString& DwString::replace(size_t aPos1, size_t aLen1, size_t aLen2,
+    char aChar)
+{
+    _replace(aPos1, aLen1, aLen2, aChar);
+    return *this;
+}
+
+
+size_t DwString::copy(char* aBuf, size_t aLen, size_t aPos) const
+{
+    assert(aPos <= mLength);
+    assert(aBuf != 0);
+    size_t pos = DW_MIN(aPos, mLength);
+    size_t len = DW_MIN(aLen, mLength - pos);
+    char* to = aBuf;
+    const char* from = mRep->mBuffer + mStart + pos;
+    mem_copy(from, len, to);
+    return len;
+}
+
+
+void DwString::swap(DwString& aStr)
+{
+    DwStringRep* rep = mRep;
+    mRep = aStr.mRep;
+    aStr.mRep = rep;
+    size_t n = mStart;
+    mStart = aStr.mStart;
+    aStr.mStart = n;
+    n = mLength;
+    mLength = aStr.mLength;
+    aStr.mLength = n;
+}
+
+
+size_t DwString::find(const DwString& aStr, size_t aPos) const
+{
+    return find(&aStr.mRep->mBuffer[aStr.mStart], aPos, aStr.mLength);
+}
+
+
+size_t DwString::find(const char* aBuf, size_t aPos, size_t aLen) const
+{
+    assert(aBuf != 0);
+    if (aBuf == 0) return (size_t)-1;
+    if (aLen > mLength) return (size_t)-1;
+    if (aPos > mLength-aLen) return (size_t)-1;
+    if (aLen == 0) return aPos;
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t i=aPos; i <= mLength-aLen; ++i) {
+        size_t k = i;
+        size_t j = 0;
+        while (j < aLen && aBuf[j] == buf[k]) {
+            ++j; ++k;
+        }
+        if (j == aLen) return i;
+    }
+    return (size_t)-1;
+}
+
+
+size_t DwString::find(const char* aCstr, size_t aPos) const
+{
+    assert(aCstr != 0);
+    if (aCstr == 0) return (size_t)-1;
+    size_t len = strlen(aCstr);
+    return find(aCstr, aPos, len);
+}
+
+
+size_t DwString::find(char aChar, size_t aPos) const
+{
+    if (aPos >= mLength) return (size_t)-1;
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t i=aPos; i < mLength; ++i) {
+        if (buf[i] == aChar) return i;
+    }
+    return (size_t)-1;
+}
+
+
+size_t DwString::rfind(const DwString& aStr, size_t aPos) const
+{
+    return rfind(&aStr.mRep->mBuffer[aStr.mStart], aPos, aStr.mLength);
+}
+
+
+size_t DwString::rfind(const char* aBuf, size_t aPos, size_t aLen) const
+{
+    assert(aBuf != 0);
+    if (aBuf == 0) return (size_t)-1;
+    if (aLen > mLength) return (size_t)-1;
+    size_t pos = DW_MIN(aPos, mLength - aLen);
+    if (aLen == 0) return pos;
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t i=0; i <= pos; ++i) {
+        size_t k = pos - i;
+        size_t j = 0;
+        while (j < aLen && aBuf[j] == buf[k]) {
+            ++j; ++k;
+        }
+        if (j == aLen) return pos - i;
+    }
+    return (size_t)-1;
+}
+
+
+size_t DwString::rfind(const char* aCstr, size_t aPos) const
+{
+    assert(aCstr != 0);
+    size_t len = (aCstr) ? strlen(aCstr) : 0;
+    return rfind(aCstr, aPos, len);
+}
+
+
+size_t DwString::rfind(char aChar, size_t aPos) const
+{
+    size_t pos = DW_MIN(aPos, mLength - 1);
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t i=0; i <= pos; ++i) {
+        size_t k = pos - i;
+        if (buf[k] == aChar) return k;
+    }
+    return (size_t)-1;
+}
+
+
+size_t DwString::find_first_of(const DwString& aStr, size_t aPos) const
+{
+    return find_first_of(&aStr.mRep->mBuffer[aStr.mStart], aPos, aStr.mLength);
+}
+
+
+size_t DwString::find_first_of(const char* aBuf, size_t aPos, size_t aLen) const
+{
+    assert(aBuf != 0);
+    if (aBuf == 0) return (size_t)-1;
+    if (aPos >= mLength) return (size_t)-1;
+    if (aLen == 0) return aPos;
+    char table[256];
+    memset(table, 0, sizeof(table));
+    for (size_t j=0; j < aLen; ++j) {
+        table[aBuf[j]&0xff] = 1;
+    }
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t i=aPos; i < mLength; ++i) {
+        if (table[buf[i]&0xff]) return i;
+    }
+    return (size_t)-1;
+}
+
+
+size_t DwString::find_first_of(const char* aCstr, size_t aPos) const
+{
+    assert(aCstr != 0);
+    if (aCstr == 0) return (size_t)-1;
+    size_t len = strlen(aCstr);
+    return find_first_of(aCstr, aPos, len);
+}
+
+
+size_t DwString::find_last_of(const DwString& aStr, size_t aPos) const
+{
+    return find_last_of(&aStr.mRep->mBuffer[aStr.mStart], aPos, aStr.mLength);
+}
+
+
+size_t DwString::find_last_of(const char* aBuf, size_t aPos, size_t aLen) const
+{
+    assert(aBuf != 0);
+    if (aBuf == 0) return (size_t)-1;
+    if (mLength == 0) return (size_t)-1;
+    size_t pos = DW_MIN(aPos, mLength - 1);
+    if (aLen == 0) return pos;
+    char table[256];
+    memset(table, 0, sizeof(table));
+    for (size_t j=0; j < aLen; ++j) {
+        table[aBuf[j]&0xff] = 1;
+    }
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t k=0; k <= pos; ++k) {
+        size_t i = pos - k;
+        if (table[buf[i]&0xff]) return i;
+    }
+    return (size_t)-1;
+}
+
+
+size_t DwString::find_last_of(const char* aCstr, size_t aPos) const
+{
+    assert(aCstr != 0);
+    if (aCstr == 0) return (size_t)-1;
+    size_t len = strlen(aCstr);
+    return find_last_of(aCstr, aPos, len);
+}
+
+
+size_t DwString::find_first_not_of(const DwString& aStr, size_t aPos) const
+{
+    return find_first_not_of(&aStr.mRep->mBuffer[aStr.mStart], aPos, aStr.mLength);
+}
+
+
+size_t DwString::find_first_not_of(const char* aBuf, size_t aPos, size_t aLen) const
+{
+    assert(aBuf != 0);
+    if (aBuf == 0) return (size_t)-1;
+    if (aPos >= mLength) return (size_t)-1;
+    if (aLen == 0) return (size_t)-1;
+    char table[256];
+    memset(table, 1, sizeof(table));
+    for (size_t j=0; j < aLen; ++j) {
+        table[aBuf[j]&0xff] = 0;
+    }
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t i=aPos; i < mLength; ++i) {
+        if (table[buf[i]&0xff]) return i;
+    }
+    return (size_t)-1;
+}
+
+
+size_t DwString::find_first_not_of(const char* aCstr, size_t aPos) const
+{
+    assert(aCstr != 0);
+    if (aCstr == 0) return (size_t)-1;
+    size_t len = strlen(aCstr);
+    return find_first_not_of(aCstr, aPos, len);
+}
+
+
+size_t DwString::find_last_not_of(const DwString& aStr, size_t aPos) const
+{
+    return find_last_not_of(&aStr.mRep->mBuffer[aStr.mStart], aPos, aStr.mLength);
+}
+
+
+size_t DwString::find_last_not_of(const char* aBuf, size_t aPos, size_t aLen) const
+{
+    assert(aBuf != 0);
+    if (aBuf == 0) return (size_t)-1;
+    if (mLength == 0) return (size_t)-1;
+    size_t pos = DW_MIN(aPos, mLength - 1);
+    if (aLen == 0) return (size_t)-1;
+    char table[256];
+    memset(table, 1, sizeof(table));
+    for (size_t j=0; j < aLen; ++j) {
+        table[aBuf[j]&0xff] = 0;
+    }
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t k=0; k <= pos; ++k) {
+        size_t i = pos - k;
+        if (table[buf[i]&0xff]) return i;
+    }
+    return (size_t)-1;
+}
+
+
+size_t DwString::find_last_not_of(const char* aCstr, size_t aPos) const
+{
+    assert(aCstr != 0);
+    if (aCstr == 0) return (size_t)-1;
+    size_t len = strlen(aCstr);
+    return find_last_not_of(aCstr, aPos, len);
+}
+
+
+DwString DwString::substr(size_t aPos, size_t aLen) const
+{
+    assert(aPos <= mLength);
+    size_t pos = DW_MIN(aPos, mLength);
+    size_t len = DW_MIN(aLen, mLength - pos);
+    return DwString(*this, pos, len);
+}
+
+
+int DwString::compare(const DwString& aStr) const
+{
+    return compare(0, mLength, aStr, 0, aStr.mLength);
+}
+
+
+int DwString::compare(size_t aPos1, size_t aLen1, const DwString& aStr) const
+{
+    return compare(aPos1, aLen1, aStr, 0, aStr.mLength);
+}
+
+
+int DwString::compare(size_t aPos1, size_t aLen1, const DwString& aStr,
+        size_t aPos2, size_t aLen2) const
+{
+    assert(aPos1 <= mLength);
+    assert(aPos2 <= aStr.mLength);
+    size_t pos1 = DW_MIN(aPos1, mLength);
+    const char* buf1 = mRep->mBuffer + mStart + pos1;
+    size_t len1 = DW_MIN(aLen1, mLength - pos1);
+    size_t pos2 = DW_MIN(aPos2, aStr.mLength);
+    const char* buf2 = aStr.mRep->mBuffer + aStr.mStart + pos2;
+    size_t len2 = DW_MIN(aLen2, aStr.mLength - pos2);
+    size_t len = DW_MIN(len1, len2);
+    int r = strncmp(buf1, buf2, len);
+    if (r == 0) {
+        if (len1 < len2)
+            r = -1;
+        else if (len1 > len2) {
+            r = 1;
+        }
+    }
+    return r;
+}
+
+
+int DwString::compare(const char* aCstr) const
+{
+    assert(aCstr != 0);
+    size_t len = (aCstr) ? strlen(aCstr) : 0;
+    return compare(0, mLength, aCstr, len);
+}
+
+
+int DwString::compare(size_t aPos1, size_t aLen1, const char* aBuf,
+    size_t aLen2) const
+{
+    assert(aBuf != 0);
+    assert(aPos1 <= mLength);
+    if (aBuf == 0) {
+        return (aLen1 > 0) ? 1 : 0;
+    }
+    size_t pos1 = DW_MIN(aPos1, mLength);
+    const char* buf1 = mRep->mBuffer + mStart + pos1;
+    size_t len1 = DW_MIN(aLen1, mLength - pos1);
+    const char* buf2 = aBuf;
+    size_t len2 = aLen2;
+    size_t len = DW_MIN(len1, len2);
+    int r = strncmp(buf1, buf2, len);
+    if (r == 0) {
+        if (len1 < len2)
+            r = -1;
+        else if (len1 > len2) {
+            r = 1;
+        }
+    }
+    return r;
+}
+
+
+const char* DwString::ClassName() const
+{
+    return "DwString";
+}
+
+
+int DwString::ObjectId() const
+{
+    return (int) (long) this;
+}
+
+
+void DwString::ConvertToLowerCase()
+{
+    if (mRep->mRefCount > 1) {
+        _copy();
+    }
+    char* buf = mRep->mBuffer + mStart;
+    for (size_t i=0; i < mLength; ++i) {
+        buf[i] = (char) dw_asciitolower(buf[i]);
+    }
+}
+
+
+void DwString::ConvertToUpperCase()
+{
+    if (mRep->mRefCount > 1) {
+        _copy();
+    }
+    char* buf = mRep->mBuffer + mStart;
+    for (size_t i=0; i < mLength; ++i) {
+        buf[i] = (char) dw_asciitoupper(buf[i]);
+    }
+}
+
+
+void DwString::Trim()
+{
+    const char* buf = mRep->mBuffer + mStart;
+    size_t i = 0;
+    while (mLength > 0) {
+        if (isspace(buf[i])) {
+            ++mStart;
+            --mLength;
+            ++i;
+        }
+        else {
+            break;
+        }
+    }
+    buf = mRep->mBuffer + mStart;
+    i = mLength - 1;
+    while (mLength > 0) {
+        if (isspace(buf[i])) {
+            --mLength;
+            --i;
+        }
+        else {
+            break;
+        }
+    }
+    if (mLength == 0) {
+        assign("");
+    }
+}
+
+
+void DwString::WriteTo(std::ostream& aStrm) const
+{
+    const char* buf = mRep->mBuffer + mStart;
+    for (size_t i=0; i < mLength; ++i) {
+        aStrm << buf[i];
+    }
+}
+
+
+void DwString::TakeBuffer(char* aBuf, size_t aSize, size_t aStart, size_t aLen)
+{
+    assert(aBuf != 0);
+    DwStringRep* rep = new DwStringRep(aBuf, aSize);
+    assert(rep != 0);
+    if (rep) {
+        delete_rep_safely(mRep);
+        mRep = rep;
+        mStart = aStart;
+        mLength = aLen;
+    }
+}
+
+
+void DwString::ReleaseBuffer(char** aBuf, size_t* aSize, size_t* aStart,
+    size_t* aLen)
+{
+    assert(aBuf != 0);
+    assert(aSize != 0);
+    assert(aStart != 0);
+    assert(aLen != 0);
+    if (mRep->mRefCount == 1) {
+        *aBuf = mRep->mBuffer;
+        *aSize = mRep->mSize;
+    }
+    else {
+        size_t size = mRep->mSize;
+        char* buf = new char [size];
+        assert(buf != 0);
+        if (buf != 0) {
+            mem_copy(mRep->mBuffer, size, buf);
+            *aBuf = buf;
+            *aSize = size;
+        }
+        else {
+            // If not throwing an exception, recover as best we can
+            *aBuf = 0;
+            *aSize = 0;
+            *aStart = mStart = 0;
+            *aLen = mLength = 0;
+            return;
+        }
+    }
+    *aStart = mStart;
+    *aLen = mLength;
+    mRep = new_rep_reference(sEmptyRep);
+    mStart = 0;
+    mLength = 0;
+}
+
+
+void DwString::CopyTo(DwString* aStr) const
+{
+    assert(aStr != 0);
+    if (!aStr) return;
+    size_t len = mLength;
+    size_t size = len + 1;
+    char* buf = mem_alloc(&size);
+    assert(buf != 0);
+    if (buf != 0) {
+        mem_copy(mRep->mBuffer+mStart, len, buf);
+        buf[len] = 0;
+        DwStringRep* rep = new DwStringRep(buf, size);
+        assert(rep != 0);
+        if (rep != 0) {
+            aStr->mRep = rep;
+            delete_rep_safely(aStr->mRep);
+            aStr->mStart = 0;
+            aStr->mLength = len;
+        }
+    }
+}
+
+
+void DwString::_copy()
+{
+    if (mRep->mRefCount > 1) {
+        size_t size = mLength + 1;
+        char* newBuf = mem_alloc(&size);
+        assert(newBuf != 0);
+        if (newBuf != 0) {
+            char* to = newBuf;
+            const char* from = mRep->mBuffer + mStart;
+            mem_copy(from, mLength, to);
+            to[mLength] = 0;
+            DwStringRep* rep = new DwStringRep(newBuf, size);
+            assert(rep != 0);
+            if (rep != 0) {
+                delete_rep_safely(mRep);
+                mRep = rep;
+                mStart = 0;
+            }
+            else /* if (rep == 0) */ {
+                mem_free(newBuf);
+                mLength = 0;
+            }
+        }
+        else /* if (newBuf == 0) */ {
+            mLength = 0;
+        }
+    }
+}
+
+
+void DwString::_replace(size_t aPos1, size_t aLen1, const char* aBuf, size_t aLen2)
+{
+    assert(aPos1 <= mLength);
+    assert(aBuf != 0);
+    size_t pos1 = DW_MIN(aPos1, mLength);
+    size_t len1 = DW_MIN(aLen1, mLength - pos1);
+    assert(mStart + mLength - len1 < ((size_t)-1) - aLen2);
+    size_t len2 = DW_MIN(aLen2, ((size_t)-1) - (mStart + mLength - len1));
+    size_t i;
+    char* to;
+    const char* from;
+    size_t newLen = (mLength - len1) + len2;
+    // Is new string empty?
+    if (newLen == 0 || aBuf == 0) {
+        if (mRep != sEmptyRep) {
+            delete_rep_safely(mRep);
+            mRep = new_rep_reference(sEmptyRep);
+            mStart = 0;
+            mLength = 0;
+        }
+    }
+    // Is buffer shared?  Is buffer too small?
+    else if (mRep->mRefCount > 1 || newLen >= mRep->mSize) {
+        size_t size = newLen + 1;
+        char* newBuf = mem_alloc(&size);
+        assert(newBuf != 0);
+        if (newBuf != 0) {
+            to = newBuf;
+            memcpy(to, mRep->mBuffer + mStart, pos1);
+            to += pos1;
+            memcpy(to, aBuf, len2);
+            to += len2;
+            memcpy(to, mRep->mBuffer + mStart + pos1 + len1, mLength - pos1 - len1);
+            to += mLength - pos1 - len1;
+            *to = 0;
+            DwStringRep* rep = new DwStringRep(newBuf, size);
+            assert(rep != 0);
+            if (rep != 0) {
+                delete_rep_safely(mRep);
+                mRep = rep;
+                mStart = 0;
+                mLength = newLen;
+            }
+        }
+    }
+    // Is the replacement smaller than the replaced?
+    else if (len2 < len1) {
+        to = mRep->mBuffer + mStart + pos1;
+        from = aBuf;
+        for (i=0; i < len2; ++i) *to++ = *from++;
+        from = mRep->mBuffer + mStart + pos1 + len1;
+        for (i=0; i < mLength - pos1 - len1; ++i) *to++ = *from++;
+        *to = 0;
+        mLength = newLen;
+    }
+    // Is there enough room at end of buffer?
+    else if (mStart + newLen < mRep->mSize) {
+        to = mRep->mBuffer + mStart + newLen;
+        from = mRep->mBuffer + mStart + mLength - 1;
+        *to-- = 0;
+        for (i=0; i < mLength-pos1-len1; ++i) *to-- = *from--;
+        from = aBuf + (len2 - 1);
+        for (i=0; i < len2; ++i) *to-- = *from--;
+        mLength = newLen;
+    }
+    // Is there enough room at beginning of buffer?
+    else if (len2 - len1 <= mStart) {
+        to = mRep->mBuffer + mStart - (len2 - len1);
+        from = mRep->mBuffer + mStart;
+        for (i=0; i < pos1; ++i) *to++ = *from++;
+        from = aBuf;
+        for (i=0; i < len2; ++i) *to++ = *from++;
+        mStart -= len2 - len1;
+        mLength = newLen;
+    }
+    // There's enough room, but we must move characters.
+    else {
+        to = mRep->mBuffer + newLen;
+        from = mRep->mBuffer + mStart + mLength - 1;
+        *to-- = 0;
+        for (i=0; i < mLength-pos1-len1; ++i) *to-- = *from--;
+        to = mRep->mBuffer;
+        from = mRep->mBuffer + mStart;
+        for (i=0; i < pos1; ++i) *to++ = *from++;
+        from = aBuf;
+        for (i=0; i < len2; ++i) *to++ = *from++;
+        mStart = 0;
+        mLength = newLen;
+    }
+}
+
+
+void DwString::_replace(size_t aPos1, size_t aLen1, size_t aLen2, char aChar)
+{
+    assert(aPos1 <= mLength);
+    size_t pos1 = DW_MIN(aPos1, mLength);
+    size_t len1 = DW_MIN(aLen1, mLength - pos1);
+    assert(mStart + mLength - len1 < ((size_t)-1) - aLen2);
+    size_t len2 = DW_MIN(aLen2, ((size_t)-1) - (mStart + mLength - len1));
+    size_t i;
+    char* to;
+    const char* from;
+    size_t newLen = mLength - len1 + len2;
+    // Is new string empty?
+    if (newLen == 0) {
+        if (mRep != sEmptyRep) {
+            delete_rep_safely(mRep);
+            mRep = new_rep_reference(sEmptyRep);
+            mStart = 0;
+            mLength = 0;
+        }
+    }
+    // Is buffer shared?  Is buffer too small?
+    else if (mRep->mRefCount > 1 || newLen >= mRep->mSize) {
+        size_t size = newLen + 1;
+        char* newBuf = mem_alloc(&size);
+        assert(newBuf != 0);
+        if (newBuf != 0) {
+            to = newBuf;
+            from = mRep->mBuffer + mStart;
+            for (i=0; i < pos1; ++i) *to++ = *from++;
+            for (i=0; i < len2; ++i) *to++ = aChar;
+            from = mRep->mBuffer + mStart + pos1 + len1;
+            for (i=0; i < mLength - pos1 - len1; ++i) *to++ = *from++;
+            *to = 0;
+            DwStringRep* rep = new DwStringRep(newBuf, size);
+            assert(rep != 0);
+            if (rep != 0) {
+                delete_rep_safely(mRep);
+                mRep = rep;
+                mStart = 0;
+                mLength = newLen;
+            }
+        }
+    }
+    // Is the replacement smaller than the replaced?
+    else if (len2 < len1) {
+        to = mRep->mBuffer + mStart + pos1;
+        for (i=0; i < len2; ++i) *to++ = aChar;
+        from = mRep->mBuffer + mStart + pos1 + len1;
+        for (i=0; i < mLength - pos1 - len1; ++i) *to++ = *from++;
+        *to = 0;
+        mLength = newLen;
+    }
+    // Is there enough room at end of buffer?
+    else if (mStart + newLen < mRep->mSize) {
+        to = mRep->mBuffer + mStart + newLen;
+        from = mRep->mBuffer + mStart + mLength - 1;
+        *to-- = 0;
+        for (i=0; i < mLength-pos1-len1; ++i) *to-- = *from--;
+        for (i=0; i < len2; ++i) *to-- = aChar;
+        mLength = newLen;
+    }
+    // Is there enough room at beginning of buffer?
+    else if (len2 - len1 <= mStart) {
+        to = mRep->mBuffer + mStart - (len2 - len1);
+        from = mRep->mBuffer + mStart;
+        for (i=0; i < pos1; ++i) *to++ = *from++;
+        for (i=0; i < len2; ++i) *to++ = aChar;
+        mStart -= len2 - len1;
+        mLength = newLen;
+    }
+    // There's enough room, but we must move characters.
+    else {
+        to = mRep->mBuffer + newLen;
+        from = mRep->mBuffer + mStart + mLength - 1;
+        *to-- = 0;
+        for (i=0; i < mLength-pos1-len1; ++i) *to-- = *from--;
+        to = mRep->mBuffer;
+        from = mRep->mBuffer + mStart;
+        for (i=0; i < pos1; ++i) *to++ = *from++;
+        for (i=0; i < len2; ++i) *to++ = aChar;
+        mStart = 0;
+        mLength = newLen;
+    }
+}
+
+
+#if defined (DW_DEBUG_VERSION)
+void DwString::PrintDebugInfo(std::ostream& aStrm) const
+{
+    aStrm <<
+    "----------------- Debug info for DwString class ----------------\n";
+    aStrm << "Id:               " << ClassName() << ", " << ObjectId() << "\n";
+    aStrm << "Rep:              " << (void*) mRep << "\n";
+    aStrm << "Buffer:           " << (void*) mRep->mBuffer << "\n";
+    aStrm << "Buffer size:      " << mRep->mSize << "\n";
+    aStrm << "Start:            " << mStart << "\n";
+    aStrm << "Length:           " << mLength << "\n";
+    aStrm << "Contents:         ";
+    for (size_t i=0; i < mLength && i < 64; ++i) {
+        aStrm << mRep->mBuffer[mStart+i];
+    }
+    aStrm << std::endl;
+}
+#else
+void DwString::PrintDebugInfo(std::ostream& ) const {}
+#endif // defined (DW_DEBUG_VERSION)
+
+
+void DwString::CheckInvariants() const
+{
+#if defined (DW_DEBUG_VERSION)
+    assert(mRep != 0);
+    mRep->CheckInvariants();
+#endif // defined (DW_DEBUG_VERSION)
+}
+
+
+DwString operator + (const DwString& aStr1, const DwString& aStr2)
+{
+    DwString str(aStr1);
+    str.append(aStr2);
+    return str;
+}
+
+
+DwString operator + (const char* aCstr, const DwString& aStr2)
+{
+    DwString str(aCstr);
+    str.append(aStr2);
+    return str;
+}
+
+
+DwString operator + (char aChar, const DwString& aStr2)
+{
+    DwString str(1, aChar);
+    str.append(aStr2);
+    return str;
+}
+
+
+DwString operator + (const DwString& aStr1, const char* aCstr)
+{
+    DwString str(aStr1);
+    str.append(aCstr);
+    return str;
+}
+
+
+DwString operator + (const DwString& aStr1, char aChar)
+{
+    DwString str(aStr1);
+    str.append(1, aChar);
+    return str;
+}
+
+
+DwBool operator == (const DwString& aStr1, const DwString& aStr2)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r == 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator == (const DwString& aStr1, const char* aCstr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r == 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator == (const char* aCstr, const DwString& aStr2)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r == 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator != (const DwString& aStr1, const DwString& aStr2)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r == 0) ? 0 : 1;
+    return r;
+}
+
+
+DwBool operator != (const DwString& aStr1, const char* aCstr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r == 0) ? 0 : 1;
+    return r;
+}
+
+
+DwBool operator != (const char* aCstr, const DwString& aStr2)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r == 0) ? 0 : 1;
+    return r;
+}
+
+
+DwBool operator < (const DwString& aStr1, const DwString& aStr2)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r < 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator < (const DwString& aStr1, const char* aCstr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r < 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator < (const char* aCstr, const DwString& aStr2)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r < 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator > (const DwString& aStr1, const DwString& aStr2)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r > 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator > (const DwString& aStr1, const char* aCstr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r > 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator > (const char* aCstr, const DwString& aStr2)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r > 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator <= (const DwString& aStr1, const DwString& aStr2)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r <= 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator <= (const DwString& aStr1, const char* aCstr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r <= 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator <= (const char* aCstr, const DwString& aStr2)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r <= 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator >= (const DwString& aStr1, const DwString& aStr2)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r >= 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator >= (const DwString& aStr1, const char* aCstr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r >= 0) ? 1 : 0;
+    return r;
+}
+
+
+DwBool operator >= (const char* aCstr, const DwString& aStr2)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    int r = dw_strcmp(s1, len1, s2, len2);
+    r = (r >= 0) ? 1 : 0;
+    return r;
+}
+
+
+std::ostream& operator << (std::ostream& aOstrm, const DwString& aStr)
+{
+    const char* buf = aStr.data();
+    for (size_t i=0; i < aStr.length(); ++i) {
+        aOstrm << buf[i];
+    }
+    return aOstrm;
+}
+
+
+std::istream& getline(std::istream& aIstrm, DwString& aStr, char aDelim)
+{
+    aStr.clear();
+    char ch;
+    while (aIstrm.get(ch)) {
+        if (ch == aDelim) break;
+        if (aStr.length() < aStr.max_size()) {
+            aStr.append(1, ch);
+        }
+    }
+    return aIstrm;
+}
+
+
+std::istream& getline(std::istream& aIstrm, DwString& aStr)
+{
+    return getline(aIstrm, aStr, '\n');
+}
+
+#endif // !defined(DW_USE_ANSI_STRING)
+
+
+int DwStrcasecmp(const DwString& aStr1, const DwString& aStr2)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    return dw_strasciicasecmp(s1, len1, s2, len2);
+}
+
+
+int DwStrcasecmp(const DwString& aStr, const char* aCstr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr.data();
+    size_t len1 = aStr.length();
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    return dw_strasciicasecmp(s1, len1, s2, len2);
+}
+
+
+int DwStrcasecmp(const char* aCstr, const DwString& aStr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 =  (aCstr) ? strlen(aCstr) : 0;
+    const char* s2 = aStr.data();
+    size_t len2 = aStr.length();
+    return dw_strasciicasecmp(s1, len1, s2, len2);
+}
+
+
+int DwStrncasecmp(const DwString& aStr1, const DwString& aStr2, size_t n)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    len1 = DW_MIN(len1, n);
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    len2 = DW_MIN(len2, n);
+    return dw_strasciicasecmp(s1, len1, s2, len2);
+}
+
+
+int DwStrncasecmp(const DwString& aStr, const char* aCstr, size_t n)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr.data();
+    size_t len1 = aStr.length();
+    len1 = DW_MIN(len1, n);
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    len2 = DW_MIN(len2, n);
+    return dw_strasciicasecmp(s1, len1, s2, len2);
+}
+
+
+int DwStrncasecmp(const char* aCstr, const DwString& aStr, size_t n)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    len1 = DW_MIN(len1, n);
+    const char* s2 = aStr.data();
+    size_t len2 = aStr.length();
+    len2 = DW_MIN(len2, n);
+    return dw_strasciicasecmp(s1, len1, s2, len2);
+}
+
+
+int DwStrcmp(const DwString& aStr1, const DwString& aStr2)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    return dw_strcmp(s1, len1, s2, len2);
+}
+
+
+int DwStrcmp(const DwString& aStr, const char* aCstr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr.data();
+    size_t len1 = aStr.length();
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    return dw_strcmp(s1, len1, s2, len2);
+}
+
+
+int DwStrcmp(const char* aCstr, const DwString& aStr)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    const char* s2 = aStr.data();
+    size_t len2 = aStr.length();
+    return dw_strcmp(s1, len1, s2, len2);
+}
+
+
+int DwStrncmp(const DwString& aStr1, const DwString& aStr2, size_t n)
+{
+    const char* s1 = aStr1.data();
+    size_t len1 = aStr1.length();
+    len1 = DW_MIN(len1, n);
+    const char* s2 = aStr2.data();
+    size_t len2 = aStr2.length();
+    len2 = DW_MIN(len2, n);
+    return dw_strcmp(s1, len1, s2, len2);
+}
+
+
+int DwStrncmp(const DwString& aStr, const char* aCstr, size_t n)
+{
+    assert(aCstr != 0);
+    const char* s1 = aStr.data();
+    size_t len1 = aStr.length();
+    len1 = DW_MIN(len1, n);
+    const char* s2 = aCstr;
+    size_t len2 = (aCstr) ? strlen(aCstr) : 0;
+    len2 = DW_MIN(len2, n);
+    return dw_strcmp(s1, len1, s2, len2);
+}
+
+
+int DwStrncmp(const char* aCstr, const DwString& aStr, size_t n)
+{
+    assert(aCstr != 0);
+    const char* s1 = aCstr;
+    size_t len1 = (aCstr) ? strlen(aCstr) : 0;
+    len1 = DW_MIN(len1, n);
+    const char* s2 = aStr.data();
+    size_t len2 = aStr.length();
+    len2 = DW_MIN(len2, n);
+    return dw_strcmp(s1, len1, s2, len2);
+}
+
+
+void DwStrcpy(DwString& aStrDest, const DwString& aStrSrc)
+{
+    aStrDest.assign(aStrSrc);
+}
+
+
+void DwStrcpy(DwString& aStrDest, const char* aCstrSrc)
+{
+    aStrDest.assign(aCstrSrc);
+}
+
+
+void DwStrcpy(char* aCstrDest, const DwString& aStrSrc)
+{
+    assert(aCstrDest != 0);
+    const char* buf = aStrSrc.data();
+    size_t len = aStrSrc.length();
+    mem_copy(buf, len, aCstrDest);
+    aCstrDest[len] = 0;
+}
+
+
+void DwStrncpy(DwString& aStrDest, const DwString& aStrSrc, size_t n)
+{
+    aStrDest.assign(aStrSrc, 0, n);
+}
+
+
+void DwStrncpy(DwString& aStrDest, const char* aCstrSrc, size_t n)
+{
+    aStrDest.assign(aCstrSrc, 0, n);
+}
+
+
+void DwStrncpy(char* aCstrDest, const DwString& aStrSrc, size_t n)
+{
+    assert(aCstrDest != 0);
+    const char* buf = aStrSrc.data();
+    size_t len = aStrSrc.length();
+    len = DW_MIN(len, n);
+    mem_copy(buf, len, aCstrDest);
+    for (size_t i=len; i < n; ++i) {
+        aCstrDest[i] = 0;
+    }
+}
+
+
+char* DwStrdup(const DwString& aStr)
+{
+    size_t len = aStr.length();
+    char* buf = new char[len+1];
+    assert(buf != 0);
+    if (buf != 0) {
+        DwStrncpy(buf, aStr, len);
+        buf[len] = 0;
+    }
+    return buf;
+}