X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8bedcdce08e1575b74250d2ebac4355a687ccf8d..c0eba78b86232bf8c2ef886e0a35808ab09df25f:/src/common/longlong.cpp

diff --git a/src/common/longlong.cpp b/src/common/longlong.cpp
index 704f95e7f6..d85b5420fb 100644
--- a/src/common/longlong.cpp
+++ b/src/common/longlong.cpp
@@ -25,9 +25,11 @@
     #pragma hdrstop
 #endif
 
+#if wxUSE_LONGLONG
 #include "wx/longlong.h"
 
 #include <memory.h>     // for memset()
+#include <math.h>       // for fabs()
 
 // ============================================================================
 // implementation
@@ -39,7 +41,7 @@
 // misc
 // ----------------------------------------------------------------------------
 
-void *wxLongLongNative::asArray(void) const
+void *wxLongLongNative::asArray() const
 {
     static unsigned char temp[8];
 
@@ -55,6 +57,8 @@ void *wxLongLongNative::asArray(void) const
     return temp;
 }
 
+#if wxUSE_STD_IOSTREAM
+
 // input/output
 ostream& operator<< (ostream& o, const wxLongLongNative& ll)
 {
@@ -72,101 +76,126 @@ ostream& operator<< (ostream& o, const wxLongLongNative& ll)
     return o << result;
 }
 
+#endif // wxUSE_STD_IOSTREAM
+
 #endif // wxUSE_LONGLONG_NATIVE
 
+// ============================================================================
+// wxLongLongWx: emulation of 'long long' using 2 longs
+// ============================================================================
+
 #if wxUSE_LONGLONG_WX
 
+// assignment
+wxLongLongWx& wxLongLongWx::Assign(double d)
+{
+    bool positive = d >= 0;
+    d = fabs(d);
+    if ( d <= ULONG_MAX )
+    {
+        m_hi = 0;
+        m_lo = (long)d;
+    }
+    else
+    {
+        m_hi = (unsigned long)(d / (1.0 + (double)ULONG_MAX));
+        m_lo = (unsigned long)(d - ((double)m_hi * (1.0 + (double)ULONG_MAX)));
+    }
+
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll = (wxLongLong_t)d;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
+    if ( !positive )
+        Negate();
+
+    return *this;
+}
+
 wxLongLongWx wxLongLongWx::operator<<(int shift) const
 {
-    if (shift == 0)
-        return *this;
+    wxLongLongWx ll(*this);
+    ll <<= shift;
 
-    if (shift < 32)
-        return wxLongLongWx((m_hi << shift) | (m_lo >> (32 - shift)),
-                             m_lo << shift);
-    else
-        return wxLongLongWx(m_lo << (shift - 32),
-                            0);
+    return ll;
 }
 
 wxLongLongWx& wxLongLongWx::operator<<=(int shift)
 {
-    if (shift == 0)
-        return *this;
-
-    if (shift < 32)
+    if (shift != 0)
     {
-        m_hi <<= shift;
-        m_hi |= m_lo >> (32 - shift);
-        m_lo <<= shift;
-    }
-    else
-    {
-        m_hi = m_lo << (shift - 32);
-        m_lo = 0;
+        if (shift < 32)
+        {
+            m_hi <<= shift;
+            m_hi |= m_lo >> (32 - shift);
+            m_lo <<= shift;
+        }
+        else
+        {
+            m_hi = m_lo << (shift - 32);
+            m_lo = 0;
+        }
     }
 
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll <<= shift;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
     return *this;
 }
 
 wxLongLongWx wxLongLongWx::operator>>(int shift) const
 {
-    if (shift == 0)
-        return *this;
+    wxLongLongWx ll(*this);
+    ll >>= shift;
 
-    if (shift < 32)
-        return wxLongLongWx(m_hi >> shift,
-                          (m_lo >> shift) | (m_hi << (32 - shift)));
-    else
-        return wxLongLongWx((m_hi < 0 ? -1l : 0),
-                          m_hi >> (shift - 32));
+    return ll;
 }
 
 wxLongLongWx& wxLongLongWx::operator>>=(int shift)
 {
-    if (shift == 0)
-        return *this;
-
-    if (shift < 32)
-    {
-        m_lo >>= shift;
-        m_lo |= m_hi << (32 - shift);
-        m_hi >>= shift;
-    }
-    else
+    if (shift != 0)
     {
-        m_lo = m_hi >> (shift - 32);
-        m_hi = (m_hi < 0 ? -1L : 0);
+        if (shift < 32)
+        {
+            m_lo >>= shift;
+            m_lo |= m_hi << (32 - shift);
+            m_hi >>= shift;
+        }
+        else
+        {
+            m_lo = m_hi >> (shift - 32);
+            m_hi = (m_hi < 0 ? -1L : 0);
+        }
     }
 
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll >>= shift;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
     return *this;
 }
 
 wxLongLongWx wxLongLongWx::operator+(const wxLongLongWx& ll) const
 {
-    wxLongLongWx temp;
-
-    temp.m_lo = m_lo + ll.m_lo;
-    temp.m_hi = m_hi + ll.m_hi;
-    if ((temp.m_lo < m_lo) || (temp.m_lo < ll.m_lo))
-        temp.m_hi++;
+    wxLongLongWx res(*this);
+    res += ll;
 
-    return temp;
+    return res;
 }
 
 wxLongLongWx wxLongLongWx::operator+(long l) const
 {
-    wxLongLongWx temp;
-
-    temp.m_lo = m_lo + l;
-
-    if (l < 0)
-        temp.m_hi += -1l;
+    wxLongLongWx res(*this);
+    res += l;
 
-    if ((temp.m_lo < m_lo) || (temp.m_lo < (unsigned long)l))
-        temp.m_hi++;
-
-    return temp;
+    return res;
 }
 
 wxLongLongWx& wxLongLongWx::operator+=(const wxLongLongWx& ll)
@@ -179,6 +208,12 @@ wxLongLongWx& wxLongLongWx::operator+=(const wxLongLongWx& ll)
     if ((m_lo < previous) || (m_lo < ll.m_lo))
         m_hi++;
 
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll += ll.m_ll;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
     return *this;
 }
 
@@ -193,6 +228,12 @@ wxLongLongWx& wxLongLongWx::operator+=(long l)
     if ((m_lo < previous) || (m_lo < (unsigned long)l))
         m_hi++;
 
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll += l;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
     return *this;
 }
 
@@ -203,15 +244,11 @@ wxLongLongWx& wxLongLongWx::operator++()
     if (m_lo == 0)
         m_hi++;
 
-    return *this;
-}
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll++;
 
-// post increment
-wxLongLongWx& wxLongLongWx::operator++(int)
-{
-    m_lo++;
-    if (m_lo == 0)
-        m_hi++;
+    Check();
+#endif // wxLONGLONG_TEST_MODE
 
     return *this;
 }
@@ -219,28 +256,38 @@ wxLongLongWx& wxLongLongWx::operator++(int)
 // negation
 wxLongLongWx wxLongLongWx::operator-() const
 {
-    wxLongLongWx temp(~m_hi, ~m_lo);
+    wxLongLongWx res(*this);
+    res.Negate();
 
-    temp.m_lo++;
-    if (temp.m_lo == 0)
-        temp.m_hi++;
+    return res;
+}
 
-    return temp;
+wxLongLongWx& wxLongLongWx::Negate()
+{
+    m_hi = ~m_hi;
+    m_lo = ~m_lo;
+
+    m_lo++;
+    if ( m_lo == 0 )
+        m_hi++;
+
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll = -m_ll;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
+    return *this;
 }
 
 // subtraction
 
 wxLongLongWx wxLongLongWx::operator-(const wxLongLongWx& ll) const
 {
-    wxLongLongWx temp;
-
-    temp.m_lo = m_lo - ll.m_lo;
-    temp.m_hi = m_hi - ll.m_hi;
+    wxLongLongWx res(*this);
+    res -= ll;
 
-    if (m_lo < ll.m_lo)
-        temp.m_hi--;
-
-    return temp;
+    return res;
 }
 
 wxLongLongWx& wxLongLongWx::operator-=(const wxLongLongWx& ll)
@@ -253,7 +300,13 @@ wxLongLongWx& wxLongLongWx::operator-=(const wxLongLongWx& ll)
     if (previous < ll.m_lo)
         m_hi--;
 
-    return *this;;
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll -= ll.m_ll;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
+    return *this;
 }
 
 // pre decrement
@@ -263,15 +316,11 @@ wxLongLongWx& wxLongLongWx::operator--()
     if (m_lo == 0xFFFFFFFF)
         m_hi--;
 
-    return *this;
-}
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll--;
 
-// post decrement
-wxLongLongWx& wxLongLongWx::operator--(int)
-{
-    m_lo--;
-    if (m_lo == 0xFFFFFFFF)
-        m_hi--;
+    Check();
+#endif // wxLONGLONG_TEST_MODE
 
     return *this;
 }
@@ -280,54 +329,22 @@ wxLongLongWx& wxLongLongWx::operator--(int)
 
 bool wxLongLongWx::operator<(const wxLongLongWx& ll) const
 {
-    if (m_lo < ll.m_lo)
-        return 1;
-    if (m_lo > ll.m_lo)
-        return 0;
-    if (m_hi < ll.m_hi)
-        return 1;
-    if (m_hi > ll.m_hi)
-        return 0;
-    return 0;
+    if ( m_hi < ll.m_hi )
+        return TRUE;
+    else if ( m_hi == ll.m_hi )
+        return m_lo < ll.m_lo;
+    else
+        return FALSE;
 }
 
 bool wxLongLongWx::operator>(const wxLongLongWx& ll) const
 {
-    if (m_lo < ll.m_lo)
-        return 0;
-    if (m_lo > ll.m_lo)
-        return 1;
-    if (m_hi < ll.m_hi)
-        return 0;
-    if (m_hi > ll.m_hi)
-        return 1;
-    return 0;
-}
-
-bool wxLongLongWx::operator<=(const wxLongLongWx& ll) const
-{
-    if (m_lo < ll.m_lo)
-        return 1;
-    if (m_lo > ll.m_lo)
-        return 0;
-    if (m_hi < ll.m_hi)
-        return 1;
-    if (m_hi > ll.m_hi)
-        return 0;
-    return 1;
-}
-
-bool wxLongLongWx::operator>=(const wxLongLongWx& ll) const
-{
-    if (m_lo < ll.m_lo)
-        return 0;
-    if (m_lo > ll.m_lo)
-        return 1;
-    if (m_hi < ll.m_hi)
-        return 0;
-    if (m_hi > ll.m_hi)
-        return 1;
-    return 1;
+    if ( m_hi > ll.m_hi )
+        return TRUE;
+    else if ( m_hi == ll.m_hi )
+        return m_lo > ll.m_lo;
+    else
+        return FALSE;
 }
 
 // bitwise operators
@@ -352,6 +369,12 @@ wxLongLongWx& wxLongLongWx::operator&=(const wxLongLongWx& ll)
     m_lo &= ll.m_lo;
     m_hi &= ll.m_hi;
 
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll &= ll.m_ll;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
     return *this;
 }
 
@@ -360,6 +383,12 @@ wxLongLongWx& wxLongLongWx::operator|=(const wxLongLongWx& ll)
     m_lo |= ll.m_lo;
     m_hi |= ll.m_hi;
 
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll |= ll.m_ll;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
     return *this;
 }
 
@@ -368,6 +397,12 @@ wxLongLongWx& wxLongLongWx::operator^=(const wxLongLongWx& ll)
     m_lo ^= ll.m_lo;
     m_hi ^= ll.m_hi;
 
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll ^= ll.m_ll;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
     return *this;
 }
 
@@ -380,75 +415,220 @@ wxLongLongWx wxLongLongWx::operator~() const
 
 wxLongLongWx wxLongLongWx::operator*(const wxLongLongWx& ll) const
 {
-    wxLongLongWx t(m_hi, m_lo);
-    wxLongLongWx q(ll.m_hi, ll.m_lo);
-    wxLongLongWx p;
-    int counter = 0;
+    wxLongLongWx res(*this);
+    res *= ll;
 
-    do
-    {
-        if ((q.m_lo & 1) != 0)
-              p += t;
-        q >>= 1;
-        t <<= 1;
-        counter++;
-      }
-      while ((counter < 64) && ((q.m_hi != 0) || (q.m_lo != 0)));
-    return p;
+    return res;
 }
 
 wxLongLongWx& wxLongLongWx::operator*=(const wxLongLongWx& ll)
 {
     wxLongLongWx t(m_hi, m_lo);
     wxLongLongWx q(ll.m_hi, ll.m_lo);
-    int counter = 0;
 
+    m_hi = m_lo = 0;
+
+#ifdef wxLONGLONG_TEST_MODE
+    wxLongLong_t llOld = m_ll;
+    m_ll = 0;
+#endif // wxLONGLONG_TEST_MODE
+
+    int counter = 0;
     do
     {
         if ((q.m_lo & 1) != 0)
-              *this += t;
+            *this += t;
         q >>= 1;
         t <<= 1;
         counter++;
-      }
-      while ((counter < 64) && ((q.m_hi != 0) || (q.m_lo != 0)));
+    }
+    while ((counter < 64) && ((q.m_hi != 0) || (q.m_lo != 0)));
+
+#ifdef wxLONGLONG_TEST_MODE
+    m_ll = llOld * ll.m_ll;
+
+    Check();
+#endif // wxLONGLONG_TEST_MODE
+
     return *this;
 }
 
 // division
 
-void wxLongLongWx::Divide(const wxLongLongWx& divisor, wxLongLongWx& quotient, wxLongLongWx& remainder) const
+void wxLongLongWx::Divide(const wxLongLongWx& divisorIn,
+                          wxLongLongWx& quotient,
+                          wxLongLongWx& remainder) const
 {
-    if ((divisor.m_lo == 0) && (divisor.m_hi == 0))
+    if ((divisorIn.m_lo == 0) && (divisorIn.m_hi == 0))
     {
         // provoke division by zero error and silence the compilers warnings
         // about an expression without effect and unused variable
-        long dummy = divisor.m_lo/divisor.m_hi;
+        long dummy = divisorIn.m_lo/divisorIn.m_hi;
         dummy += 0;
     }
 
-    wxFAIL_MSG("not implemented");
+    // VZ: I'm writing this in a hurry and it's surely not the fastest way to
+    //     do this - any improvements are more than welcome
+    //
+    //     code inspired by the snippet at
+    //          http://www.bearcave.com/software/divide.htm
+    //
+    //     Copyright notice:
+    //
+    //     Use of this program, for any purpose, is granted the author, Ian
+    //     Kaplan, as long as this copyright notice is included in the source
+    //     code or any source code derived from this program. The user assumes
+    //     all responsibility for using this code. 
+
+    // init everything
+    wxLongLongWx dividend = *this,
+                 divisor = divisorIn;
+
+    quotient = 0l;
+    remainder = 0l;
+
+    // always do unsigned division and adjust the signs later: in C integer
+    // division, the sign of the remainder is the same as the sign of the
+    // dividend, while the sign of the quotient is the product of the signs of
+    // the dividend and divisor. Of course, we also always have
+    //
+    //      dividend = quotient*divisor + remainder
+    //
+    // with 0 <= abs(remainder) < abs(divisor)
+    bool negRemainder = dividend.m_hi < 0;
+    bool negQuotient = FALSE;   // assume positive
+    if ( dividend.m_hi < 0 )
+    {
+        negQuotient = !negQuotient;
+        dividend = -dividend;
+    }
+    if ( divisor.m_hi < 0 )
+    {
+        negQuotient = !negQuotient;
+        divisor = -divisor;
+    }
+
+    // check for some particular cases
+    if ( divisor > dividend )
+    {
+        remainder = dividend;
+    }
+    else if ( divisor == dividend )
+    {
+        quotient = 1l;
+    }
+    else
+    {
+        // here: dividend > divisor and both are positibe: do unsigned division
+        size_t nBits = 64u;
+        wxLongLongWx d;
+
+        #define IS_MSB_SET(ll)  ((ll.m_hi) & (1 << (8*sizeof(long) - 1)))
+
+        while ( remainder < divisor )
+        {
+            remainder <<= 1;
+            if ( IS_MSB_SET(dividend) )
+            {
+                remainder |= 1;
+            }
+
+            d = dividend;
+            dividend <<= 1;
+
+            nBits--;
+        }
+
+        // undo the last loop iteration
+        dividend = d;
+        remainder >>= 1;
+        nBits++;
+
+        for ( size_t i = 0; i < nBits; i++ )
+        {
+            remainder <<= 1;
+            if ( IS_MSB_SET(dividend) )
+            {
+                remainder |= 1;
+            }
+
+            wxLongLongWx t = remainder - divisor;
+            dividend <<= 1;
+            quotient <<= 1;
+            if ( !IS_MSB_SET(t) )
+            {
+                quotient |= 1;
+
+                remainder = t;
+            }
+        }
+    }
+
+    // adjust signs
+    if ( negRemainder )
+    {
+        remainder = -remainder;
+    }
+
+    if ( negQuotient )
+    {
+        quotient = -quotient;
+    }
+}
+
+wxLongLongWx wxLongLongWx::operator/(const wxLongLongWx& ll) const
+{
+    wxLongLongWx quotient, remainder;
+
+    Divide(ll, quotient, remainder);
+
+    return quotient;
+}
+
+wxLongLongWx& wxLongLongWx::operator/=(const wxLongLongWx& ll)
+{
+    wxLongLongWx quotient, remainder;
+
+    Divide(ll, quotient, remainder);
+
+    *this = quotient;
+    
+    return *this;
+}
+
+wxLongLongWx wxLongLongWx::operator%(const wxLongLongWx& ll) const
+{
+    wxLongLongWx quotient, remainder;
+
+    Divide(ll, quotient, remainder);
+
+    return remainder;
 }
 
+// ----------------------------------------------------------------------------
+// misc
+// ----------------------------------------------------------------------------
+
 // temporary - just for testing
 void *wxLongLongWx::asArray(void) const
 {
     static unsigned char temp[8];
 
-    temp[0] = (m_hi >> 24) & 0xFF;
-    temp[1] = (m_hi >> 16) & 0xFF;
-    temp[2] = (m_hi >> 8)  & 0xFF;
-    temp[3] = (m_hi >> 0)  & 0xFF;
-    temp[4] = (m_lo >> 24) & 0xFF;
-    temp[5] = (m_lo >> 16) & 0xFF;
-    temp[6] = (m_lo >> 8)  & 0xFF;
-    temp[7] = (m_lo >> 0)  & 0xFF;
+    temp[0] = (char)((m_hi >> 24) & 0xFF);
+    temp[1] = (char)((m_hi >> 16) & 0xFF);
+    temp[2] = (char)((m_hi >> 8)  & 0xFF);
+    temp[3] = (char)((m_hi >> 0)  & 0xFF);
+    temp[4] = (char)((m_lo >> 24) & 0xFF);
+    temp[5] = (char)((m_lo >> 16) & 0xFF);
+    temp[6] = (char)((m_lo >> 8)  & 0xFF);
+    temp[7] = (char)((m_lo >> 0)  & 0xFF);
 
     return temp;
 }
 
-// input/output
+#if wxUSE_STD_IOSTREAM
 
+// input/output
 ostream& operator<< (ostream& o, const wxLongLongWx& ll)
 {
     char result[65];
@@ -465,6 +645,8 @@ ostream& operator<< (ostream& o, const wxLongLongWx& ll)
 
     return o << result;
 }
-#endif
-  // wxUSE_LONGLONG_NATIVE
+#endif // wxUSE_STD_IOSTREAM
+
+#endif // wxUSE_LONGLONG_NATIVE
 
+#endif // wxUSE_LONGLONG