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|
//
// Mono.Data.SybaseTypes.SybaseDecimal
//
// Author:
// Tim Coleman <tim@timcoleman.com>
//
// Based on System.Data.SqlTypes.SqlDecimal
//
// (C) Ximian, Inc. 2002-2003
// (C) Copyright Tim Coleman, 2002
//
using Mono.Data.Tds.Protocol;
using System;
using System.Data.SqlTypes;
using System.Globalization;
using System.Text;
namespace Mono.Data.SybaseTypes {
public struct SybaseDecimal : INullable, IComparable
{
#region Fields
int[] value;
byte precision;
byte scale;
bool positive;
bool notNull;
// borrowed from System.Decimal
const int SCALE_SHIFT = 16;
const int SIGN_SHIFT = 31;
const int RESERVED_SS32_BITS = 0x7F00FFFF;
const ulong LIT_GUINT64_HIGHBIT = 0x8000000000000000;
const ulong LIT_GUINT32_HIGHBIT = 0x80000000;
const byte DECIMAL_MAX_INTFACTORS = 9;
static uint [] constantsDecadeInt32Factors = new uint [10]
{
1u, 10u, 100u, 1000u, 10000u, 100000u, 1000000u,
10000000u, 100000000u, 1000000000u
};
public static readonly byte MaxPrecision = 38;
public static readonly byte MaxScale = 38;
public static readonly SybaseDecimal MaxValue = new SybaseDecimal (MaxPrecision, (byte)0, true, (int)716002642, Int32.MaxValue, (int)1518778966, (int)1262177448);
public static readonly SybaseDecimal MinValue = new SybaseDecimal (MaxPrecision, (byte)0, false, (int)716002642, Int32.MaxValue, (int)1518778966, (int)1262177448);
public static readonly SybaseDecimal Null;
#endregion
#region Constructors
public SybaseDecimal (decimal value)
{
int[] binData = Decimal.GetBits (value);
this.scale = (byte)(binData[3] >> SCALE_SHIFT);
if (this.scale > MaxScale || (this.scale & RESERVED_SS32_BITS) != 0)
throw new ArgumentException(Locale.GetText ("Invalid scale"));
this.value = new int[4];
this.value[0] = binData[0];
this.value[1] = binData[1];
this.value[2] = binData[2];
this.value[3] = 0;
notNull = true;
positive = (value >= 0);
precision = GetPrecision (value);
}
public SybaseDecimal (double value) : this ((decimal)value) { }
public SybaseDecimal (int value) : this ((decimal)value) { }
public SybaseDecimal (long value) : this ((decimal)value) { }
public SybaseDecimal (byte bPrecision, byte bScale, bool fPositive, int[] bits) : this (bPrecision, bScale, fPositive, bits[0], bits[1], bits[2], bits[3]) { }
public SybaseDecimal (byte bPrecision, byte bScale, bool fPositive, int data1, int data2, int data3, int data4)
{
this.precision = bPrecision;
this.scale = bScale;
this.positive = fPositive;
this.value = new int[4];
this.value[0] = data1;
this.value[1] = data2;
this.value[2] = data3;
this.value[3] = data4;
notNull = true;
if (precision < scale)
throw new ArgumentException ("Invalid scale");
if (this.ToDouble () > (System.Math.Pow (10, 38) -1) || this.ToDouble () < -(System.Math.Pow (10, 38)))
throw new SybaseTypeException ("Can't convert to SybaseDecimal.");
}
#endregion
#region Properties
public byte[] BinData {
get {
byte[] b = new byte [value.Length * 4];
int j = 0;
for (int i = 0; i < value.Length; i += 1) {
b [j++] = (byte) (0xff & value [i]);
b [j++] = (byte) (0xff & value [i] >> 8);
b [j++] = (byte) (0xff & value [i] >> 16);
b [j++] = (byte) (0xff & value [i] >> 24);
}
return b;
}
}
public int[] Data {
get {
if (this.IsNull)
throw new SybaseNullValueException ();
else
return (value);
}
}
public bool IsNull {
get { return !notNull; }
}
public bool IsPositive {
get { return positive; }
}
public byte Precision {
get { return precision; }
}
public byte Scale {
get { return scale; }
}
public decimal Value {
get {
if (this.IsNull)
throw new SybaseNullValueException ();
if (this.value[3] > 0)
throw new OverflowException ();
return new decimal (value[0], value[1], value[2], !positive, scale);
}
}
#endregion
#region Methods
public static SybaseDecimal Abs (SybaseDecimal n)
{
return new SybaseDecimal (n.Precision, n.Scale, true, n.BinData [0], n.BinData [1], n.BinData [2], n.BinData [3]);
}
public static SybaseDecimal Add (SybaseDecimal x, SybaseDecimal y)
{
return (x + y);
}
public static SybaseDecimal AdjustScale (SybaseDecimal n, int digits, bool fRound)
{
byte prec = n.Precision;
if (n.IsNull)
throw new SybaseNullValueException ();
if (digits > 0)
prec = (byte) (prec + digits);
if (fRound)
n = Round (n, digits + n.Scale);
return new SybaseDecimal (prec, (byte) (n.Scale + digits), n.IsPositive, n.Data);
}
public static SybaseDecimal Ceiling (SybaseDecimal n)
{
return AdjustScale (n, -(n.Scale), true);
}
public int CompareTo (object value)
{
if (value == null)
return 1;
else if (!(value is SybaseDecimal))
throw new ArgumentException (Locale.GetText ("Value is not a System.Data.SybaseTypes.SybaseDecimal"));
else if (((SybaseDecimal)value).IsNull)
return 1;
else
return this.Value.CompareTo (((SybaseDecimal)value).Value);
}
public static SybaseDecimal ConvertToPrecScale (SybaseDecimal n, int precision, int scale)
{
return new SybaseDecimal ((byte) precision, (byte) scale, n.IsPositive, n.Data);
}
public static SybaseDecimal Divide (SybaseDecimal x, SybaseDecimal y)
{
return (x / y);
}
public override bool Equals (object value)
{
if (!(value is SybaseDecimal))
return false;
else if (this.IsNull && ((SybaseDecimal) value).IsNull)
return true;
else if (((SybaseDecimal) value).IsNull)
return false;
else
return (bool) (this == (SybaseDecimal)value);
}
public static SybaseBoolean Equals (SybaseDecimal x, SybaseDecimal y)
{
return (x == y);
}
public static SybaseDecimal Floor (SybaseDecimal n)
{
return AdjustScale (n, -(n.Scale), false);
}
internal static SybaseDecimal FromTdsBigDecimal (TdsBigDecimal x)
{
if (x == null)
return Null;
else
return new SybaseDecimal (x.Precision, x.Scale, !x.IsNegative, x.Data);
}
public override int GetHashCode ()
{
int result = 10;
result = 91 * result + this.Data [0];
result = 91 * result + this.Data [1];
result = 91 * result + this.Data [2];
result = 91 * result + this.Data [3];
result = 91 * result + (int) this.Scale;
result = 91 * result + (int) this.Precision;
return result;
}
public static SybaseBoolean GreaterThan (SybaseDecimal x, SybaseDecimal y)
{
return (x > y);
}
public static SybaseBoolean GreaterThanOrEqual (SybaseDecimal x, SybaseDecimal y)
{
return (x >= y);
}
public static SybaseBoolean LessThan (SybaseDecimal x, SybaseDecimal y)
{
return (x < y);
}
public static SybaseBoolean LessThanOrEqual (SybaseDecimal x, SybaseDecimal y)
{
return (x <= y);
}
public static SybaseDecimal Multiply (SybaseDecimal x, SybaseDecimal y)
{
return (x * y);
}
public static SybaseBoolean NotEquals (SybaseDecimal x, SybaseDecimal y)
{
return (x != y);
}
public static SybaseDecimal Parse (string s)
{
if (s == null)
throw new ArgumentNullException ();
else
return SybaseDouble.Parse (s).ToSybaseDecimal ();
}
public static SybaseDecimal Power (SybaseDecimal n, double exp)
{
if (n.IsNull)
return SybaseDecimal.Null;
return new SybaseDecimal (System.Math.Pow (n.ToDouble (), exp));
}
public static SybaseDecimal Round (SybaseDecimal n, int position)
{
if (n.IsNull)
throw new SybaseNullValueException ();
SybaseDecimal result = new SybaseDecimal (System.Math.Round ((double) (n.ToDouble () * System.Math.Pow (10, position))));
result = result / new SybaseDecimal (System.Math.Pow (10, position));
return result;
}
public static SybaseInt32 Sign (SybaseDecimal n)
{
SybaseInt32 result = 0;
if (n >= new SybaseDecimal (0))
result = 1;
else
result = -1;
return result;
}
public static SybaseDecimal Subtract (SybaseDecimal x, SybaseDecimal y)
{
return (x - y);
}
private static byte GetPrecision (decimal value)
{
string str = value.ToString ();
byte result = 0;
foreach (char c in str)
if (c >= '0' && c <= '9')
result ++;
return result;
}
public double ToDouble ()
{
// FIXME: This is the wrong way to do this
double d = (uint) this.Data [0];
d += ((uint) this.Data [1]) * System.Math.Pow (2, 32);
d += ((uint) this.Data [2]) * System.Math.Pow (2, 64);
d += ((uint) this.Data [3]) * System.Math.Pow (2, 96);
d /= System.Math.Pow (10, scale);
return d;
}
public SybaseBoolean ToSybaseBoolean ()
{
return ((SybaseBoolean)this);
}
public SybaseByte ToSybaseByte ()
{
return ((SybaseByte)this);
}
public SybaseDouble ToSybaseDouble ()
{
return ((SybaseDouble)this);
}
public SybaseInt16 ToSybaseInt16 ()
{
return ((SybaseInt16)this);
}
public SybaseInt32 ToSybaseInt32 ()
{
return ((SybaseInt32)this);
}
public SybaseInt64 ToSybaseInt64 ()
{
return ((SybaseInt64)this);
}
public SybaseMoney ToSybaseMoney ()
{
return ((SybaseMoney)this);
}
public SybaseSingle ToSybaseSingle ()
{
return ((SybaseSingle)this);
}
public SybaseString ToSybaseString ()
{
return ((SybaseString)this);
}
public override string ToString ()
{
if (this.IsNull)
return String.Empty;
// convert int [4] -> ulong [2]
ulong lo = (uint) this.Data [0] + (ulong) ((ulong) this.Data [1] << 32);
ulong hi = (uint) this.Data [2] + (ulong) ((ulong) this.Data [3] << 32);
uint rest = 0;
StringBuilder result = new StringBuilder ();
for (int i = 0; lo != 0 || hi != 0; i += 1) {
Div128By32 (ref hi, ref lo, 10, ref rest);
result.Insert (0, rest.ToString ());
}
while (result.Length < Precision)
result.Append ("0");
while (result.Length > Precision)
result.Remove (result.Length - 1, 1);
if (Scale > 0)
result.Insert (result.Length - Scale, ".");
return result.ToString ();
}
// from decimal.c
private static int Div128By32 (ref ulong hi, ref ulong lo, uint divider)
{
uint t = 0;
return Div128By32 (ref hi, ref lo, divider, ref t);
}
// from decimal.c
private static int Div128By32 (ref ulong hi, ref ulong lo, uint divider, ref uint rest)
{
ulong a = 0;
ulong b = 0;
ulong c = 0;
a = (uint) (hi >> 32);
b = a / divider;
a -= b * divider;
a <<= 32;
a |= (uint) hi;
c = a / divider;
a -= c * divider;
a <<= 32;
hi = b << 32 | (uint) c;
a = (uint) (lo >> 32);
b = a / divider;
a -= b * divider;
a <<= 32;
a |= (uint) lo;
c = a / divider;
a -= c * divider;
a <<= 32;
lo = b << 32 | (uint) c;
rest = (uint) a;
a <<= 1;
return (a > divider || (a == divider && (c & 1) == 1)) ? 1 : 0;
}
[MonoTODO ("Find out what is the right way to set scale and precision")]
private static SybaseDecimal DecimalDiv (SybaseDecimal x, SybaseDecimal y)
{
ulong lo = 0;
ulong hi = 0;
int sc = 0; // scale
int texp = 0;
byte prec = 0;
prec = x.Precision >= y.Precision ? x.Precision : y.Precision;
DecimalDivSub (ref x, ref y, ref lo, ref hi, ref texp);
sc = x.Scale - y.Scale;
Rescale128 (ref lo, ref hi, ref sc, texp, 0, 38, 1);
uint r = 0;
while (prec < sc) {
Div128By32 (ref hi, ref lo, 10, ref r);
sc -= 1;
}
if (r >= 5)
lo += 1;
while ((((double) hi) * System.Math.Pow (2, 64) + lo) - System.Math.Pow (10, prec) > 0)
prec += 1;
while ((prec + sc) > MaxScale) {
Div128By32 (ref hi, ref lo, 10, ref r);
sc -= 1;
if (r >= 5)
lo += 1;
}
int resultLo = (int) lo;
int resultMi = (int) (lo >> 32);
int resultMi2 = (int) hi;
int resultHi = (int) (hi >> 32);
return new SybaseDecimal (prec, (byte) sc, true, resultLo, resultMi, resultMi2, resultHi);
}
// From decimal.c
private static void Rescale128 (ref ulong clo, ref ulong chi, ref int scale, int texp, int minScale, int maxScale, int roundFlag)
{
uint factor = 0;
uint overhang = 0;
int sc = 0;
int i = 0;
int roundBit = 0;
sc = scale;
if (texp > 0) {
// reduce exp
while (texp > 0 && sc <= maxScale) {
overhang = (uint) (chi >> 64);
while (texp > 0 && (((clo & 1) == 0) || overhang > 0)) {
if (--texp == 0)
roundBit = (int) (clo & 1);
RShift128 (ref clo, ref chi);
overhang = (uint) (chi >> 32);
}
if (texp > DECIMAL_MAX_INTFACTORS)
i = DECIMAL_MAX_INTFACTORS;
else
i = texp;
if (sc + i > maxScale)
i = maxScale - sc;
if (i == 0)
break;
texp -= i;
sc += i;
// 10^i/2^i=5^i
factor = constantsDecadeInt32Factors [i] >> i;
Mult128By32 (ref clo, ref chi, factor, 0);
}
while (texp > 0) {
if (--texp == 0)
roundBit = (int) (clo & 1);
RShift128 (ref clo, ref chi);
}
}
while (sc > maxScale) {
i = scale - maxScale;
if (i > DECIMAL_MAX_INTFACTORS)
i = DECIMAL_MAX_INTFACTORS;
sc -= i;
roundBit = Div128By32 (ref clo, ref chi, constantsDecadeInt32Factors [i]);
}
while (sc < minScale) {
if (roundFlag == 0)
roundBit = 0;
i = minScale - sc;
if (i > DECIMAL_MAX_INTFACTORS)
i = DECIMAL_MAX_INTFACTORS;
sc += i;
Mult128By32 (ref clo, ref chi, constantsDecadeInt32Factors [i], roundBit);
roundBit = 0;
}
scale = sc;
Normalize128 (ref clo, ref chi, ref sc, roundFlag, roundBit);
}
// from decimal.c
private static void Normalize128 (ref ulong clo, ref ulong chi, ref int scale, int roundFlag, int roundBit)
{
if ((roundFlag != 0) && (roundBit != 0))
RoundUp128 (ref clo, ref chi);
}
// from decimal.c
private static void RoundUp128 (ref ulong lo, ref ulong hi)
{
if ((++lo) == 0)
++hi;
}
// from decimal.c
private static void DecimalDivSub (ref SybaseDecimal x, ref SybaseDecimal y, ref ulong clo, ref ulong chi, ref int exp)
{
ulong xlo, xmi, xhi;
ulong tlo = 0;
ulong tmi = 0;
ulong thi = 0;
uint ylo = 0;
uint ymi = 0;
uint ymi2 = 0;
uint yhi = 0;
int ashift = 0;
int bshift = 0;
int extraBit = 0;
xhi = (ulong) ((ulong) x.Data [3] << 32) | (ulong) x.Data [2];
xmi = (ulong) ((ulong) x.Data [1] << 32) | (ulong) x.Data [0];
xlo = (uint) 0;
ylo = (uint) y.Data [0];
ymi = (uint) y.Data [1];
ymi2 = (uint) y.Data [2];
yhi = (uint) y.Data [3];
if (ylo == 0 && ymi == 0 && ymi2 == 0 && yhi == 0)
throw new DivideByZeroException ();
if (xmi == 0 && xhi == 0) {
clo = chi = 0;
return;
}
// enlarge dividend to get maximal precision
for (ashift = 0; (xhi & LIT_GUINT64_HIGHBIT) == 0; ++ashift)
LShift128 (ref xmi, ref xhi);
// ensure that divisor is at least 2^95
for (bshift = 0; (yhi & LIT_GUINT32_HIGHBIT) == 0; ++bshift)
LShift128 (ref ylo, ref ymi, ref ymi2, ref yhi);
thi = ((ulong) yhi) << 32 | (ulong) ymi2;
tmi = ((ulong) ymi) << 32 | (ulong) ylo;
tlo = 0;
if (xhi > thi || (xhi == thi && xmi >= tmi)) {
Sub192 (xlo, xmi, xhi, tlo, tmi, thi, ref xlo, ref xmi, ref xhi);
extraBit = 1;
} else {
extraBit = 0;
}
Div192By128To128 (xlo, xmi, xhi, ylo, ymi, ymi2, yhi, ref clo, ref chi);
exp = 128 + ashift - bshift;
if (extraBit != 0) {
RShift128 (ref clo, ref chi);
chi += LIT_GUINT64_HIGHBIT;
exp -= 1;
}
// try loss free right shift
while (exp > 0 && (clo & 1) == 0) {
RShift128 (ref clo, ref chi);
exp -= 1;
}
}
// From decimal.c
private static void RShift192 (ref ulong lo, ref ulong mi, ref ulong hi)
{
lo >>= 1;
if ((mi & 1) != 0)
lo |= LIT_GUINT64_HIGHBIT;
mi >>= 1;
if ((hi & 1) != 0)
mi |= LIT_GUINT64_HIGHBIT;
hi >>= 1;
}
// From decimal.c
private static void RShift128 (ref ulong lo, ref ulong hi)
{
lo >>= 1;
if ((hi & 1) != 0)
lo |= LIT_GUINT64_HIGHBIT;
hi >>= 1;
}
// From decimal.c
private static void LShift128 (ref ulong lo, ref ulong hi)
{
hi <<= 1;
if ((lo & LIT_GUINT64_HIGHBIT) != 0)
hi += 1;
lo <<= 1;
}
// From decimal.c
private static void LShift128 (ref uint lo, ref uint mi, ref uint mi2, ref uint hi)
{
hi <<= 1;
if ((mi2 & LIT_GUINT32_HIGHBIT) != 0)
hi += 1;
mi2 <<= 1;
if ((mi & LIT_GUINT32_HIGHBIT) != 0)
mi2 += 1;
mi <<= 1;
if ((lo & LIT_GUINT32_HIGHBIT) != 0)
mi += 1;
lo <<= 1;
}
// From decimal.c
private static void Div192By128To128 (ulong xlo, ulong xmi, ulong xhi, uint ylo, uint ymi, uint ymi2, uint yhi, ref ulong clo, ref ulong chi)
{
ulong rlo, rmi, rhi; // remainders
uint h, c;
rlo = xlo;
rmi = xmi;
rhi = xhi;
h = Div192By128To32WithRest (ref rlo, ref rmi, ref rhi, ylo, ymi, ymi2, yhi);
// mid 32 bit
rhi = (rhi << 32) | (rmi >> 32);
rmi = (rmi << 32) | (rlo >> 32);
rlo <<= 32;
chi = (((ulong)h) << 32) | Div192By128To32WithRest (ref rlo, ref rmi, ref rhi, ylo, ymi, ymi2, yhi);
// low 32 bit
rhi = (rhi << 32) | (rmi >> 32);
rmi = (rmi << 32) | (rlo >> 32);
rlo <<= 32;
h = Div192By128To32WithRest (ref rlo, ref rmi, ref rhi, ylo, ymi, ymi2, yhi);
// estimate lowest 32 bit (two last bits may be wrong)
if (rhi >= yhi)
c = 0xFFFFFFFF;
else {
rhi <<= 32;
c = (uint)(rhi / yhi);
}
clo = (((ulong)h) << 32) | c;
}
// From decimal.c
private static uint Div192By128To32WithRest (ref ulong xlo, ref ulong xmi, ref ulong xhi, uint ylo, uint ymi, uint ymi2, uint yhi)
{
ulong rlo, rmi, rhi; // remainder
ulong tlo = 0;
ulong thi = 0;
uint c;
rlo = xlo;
rmi = xmi;
rhi = xhi;
if (rhi >= (((ulong)yhi << 32)))
c = 0xFFFFFFFF;
else
c = (uint) (rhi / yhi);
Mult128By32To128 (ylo, ymi, ymi2, yhi, c, ref tlo, ref thi);
Sub192 (rlo, rmi, rhi, 0, tlo, thi, ref rlo, ref rmi, ref rhi);
while (((long)rhi) < 0) {
c--;
Add192 (rlo, rmi, rhi, 0, (((ulong)ymi) << 32) | ylo, yhi | ymi2, ref rlo, ref rmi, ref rhi);
}
xlo = rlo;
xmi = rmi;
xhi = rhi;
return c;
}
// From decimal.c
private static void Mult192By32 (ref ulong clo, ref ulong cmi, ref ulong chi, ulong factor, int roundBit)
{
ulong a = 0;
uint h0 = 0;
uint h1 = 0;
a = ((ulong)(uint)clo) * factor;
if (roundBit != 0)
a += factor / 2;
h0 = (uint)a;
a >>= 32;
a += (clo >> 32) * factor;
h1 = (uint)a;
clo = ((ulong)h1) << 32 | h0;
a >>= 32;
a += ((ulong)(uint)cmi) * factor;
h0 = (uint)a;
a >>= 32;
a += (cmi >> 32) * factor;
h1 = (uint)a;
cmi = ((ulong)h1) << 32 | h0;
a >>= 32;
a += ((ulong)(uint)chi) * factor;
h0 = (uint)a;
a >>= 32;
a += (chi >> 32) * factor;
h1 = (uint)a;
chi = ((ulong)h1) << 32 | h0;
}
// From decimal.c
private static void Mult128By32 (ref ulong clo, ref ulong chi, uint factor, int roundBit)
{
ulong a = 0;
uint h0 = 0;
uint h1 = 0;
a = ((ulong)(uint)clo) * factor;
if (roundBit != 0)
a += factor / 2;
h0 = (uint)a;
a >>= 32;
a += (clo >> 32) * factor;
h1 = (uint)a;
clo = ((ulong)h1) << 32 | h0;
a >>= 32;
a += ((ulong)(uint)chi) * factor;
h0 = (uint)a;
a >>= 32;
a += (chi >> 32) * factor;
h1 = (uint)a;
chi = ((ulong)h1) << 32 | h0;
}
// From decimal.c
private static void Mult128By32To128 (uint xlo, uint xmi, uint xmi2, uint xhi, uint factor, ref ulong clo, ref ulong chi)
{
ulong a;
uint h0, h1, h2;
a = ((ulong)xlo) * factor;
h0 = (uint)a;
a >>= 32;
a += ((ulong)xmi) * factor;
h1 = (uint)a;
a >>= 32;
a += ((ulong)xmi2) * factor;
h2 = (uint)a;
a >>= 32;
a += ((ulong)xhi) * factor;
clo = ((ulong)h1) << 32 | h0;
chi = a | h2;
}
// From decimal.c
private static void Add192 (ulong xlo, ulong xmi, ulong xhi, ulong ylo, ulong ymi, ulong yhi, ref ulong clo, ref ulong cmi, ref ulong chi)
{
xlo += ylo;
if (xlo < ylo) {
xmi++;
if (xmi == 0)
xhi++;
}
xmi += ymi;
if (xmi < ymi)
xmi++;
xhi += yhi;
clo = xlo;
cmi = xmi;
chi = xhi;
}
// From decimal.c
private static void Sub192 (ulong xlo, ulong xmi, ulong xhi, ulong ylo, ulong ymi, ulong yhi, ref ulong lo, ref ulong mi, ref ulong hi)
{
ulong clo = 0;
ulong cmi = 0;
ulong chi = 0;
clo = xlo - ylo;
cmi = xmi - ymi;
chi = xhi - yhi;
if (xlo < ylo) {
if (cmi == 0)
chi--;
cmi--;
}
if (xmi < ymi)
chi--;
lo = clo;
mi = cmi;
hi = chi;
}
public static SybaseDecimal Truncate (SybaseDecimal n, int position)
{
return new SybaseDecimal ((byte) n.Precision, (byte) position, n.IsPositive, n.Data);
}
public static SybaseDecimal operator + (SybaseDecimal x, SybaseDecimal y)
{
// if one of them is negative, perform subtraction
if (x.IsPositive && !y.IsPositive) return x - y;
if (y.IsPositive && !x.IsPositive) return y - x;
// adjust the scale to the smaller of the two beforehand
if (x.Scale > y.Scale)
x = SybaseDecimal.AdjustScale(x, y.Scale - x.Scale, true);
else if (y.Scale > x.Scale)
y = SybaseDecimal.AdjustScale(y, x.Scale - y.Scale, true);
// set the precision to the greater of the two
byte resultPrecision;
if (x.Precision > y.Precision)
resultPrecision = x.Precision;
else
resultPrecision = y.Precision;
int[] xData = x.Data;
int[] yData = y.Data;
int[] resultBits = new int[4];
ulong res;
ulong carry = 0;
// add one at a time, and carry the results over to the next
for (int i = 0; i < 4; i +=1)
{
carry = 0;
res = (ulong)(xData[i]) + (ulong)(yData[i]) + carry;
if (res > Int32.MaxValue)
{
carry = res - Int32.MaxValue;
res = Int32.MaxValue;
}
resultBits [i] = (int)res;
}
// if we have carry left, then throw an exception
if (carry > 0)
throw new OverflowException ();
else
return new SybaseDecimal (resultPrecision, x.Scale, x.IsPositive, resultBits);
}
public static SybaseDecimal operator / (SybaseDecimal x, SybaseDecimal y)
{
return DecimalDiv (x, y);
}
public static SybaseBoolean operator == (SybaseDecimal x, SybaseDecimal y)
{
if (x.IsNull || y.IsNull)
return SybaseBoolean.Null;
if (x.Scale > y.Scale)
x = SybaseDecimal.AdjustScale(x, y.Scale - x.Scale, true);
else if (y.Scale > x.Scale)
y = SybaseDecimal.AdjustScale(y, x.Scale - y.Scale, true);
for (int i = 0; i < 4; i += 1)
{
if (x.Data[i] != y.Data[i])
return new SybaseBoolean (false);
}
return new SybaseBoolean (true);
}
public static SybaseBoolean operator > (SybaseDecimal x, SybaseDecimal y)
{
if (x.IsNull || y.IsNull)
return SybaseBoolean.Null;
if (x.Scale > y.Scale)
x = SybaseDecimal.AdjustScale(x, y.Scale - x.Scale, true);
else if (y.Scale > x.Scale)
y = SybaseDecimal.AdjustScale(y, x.Scale - y.Scale, true);
for (int i = 3; i >= 0; i -= 1)
{
if (x.Data[i] == 0 && y.Data[i] == 0)
continue;
else
return new SybaseBoolean (x.Data[i] > y.Data[i]);
}
return new SybaseBoolean (false);
}
public static SybaseBoolean operator >= (SybaseDecimal x, SybaseDecimal y)
{
if (x.IsNull || y.IsNull)
return SybaseBoolean.Null;
if (x.Scale > y.Scale)
x = SybaseDecimal.AdjustScale(x, y.Scale - x.Scale, true);
else if (y.Scale > x.Scale)
y = SybaseDecimal.AdjustScale(y, x.Scale - y.Scale, true);
for (int i = 3; i >= 0; i -= 1)
{
if (x.Data[i] == 0 && y.Data[i] == 0)
continue;
else
return new SybaseBoolean (x.Data[i] >= y.Data[i]);
}
return new SybaseBoolean (true);
}
public static SybaseBoolean operator != (SybaseDecimal x, SybaseDecimal y)
{
if (x.IsNull || y.IsNull)
return SybaseBoolean.Null;
if (x.Scale > y.Scale)
x = SybaseDecimal.AdjustScale(x, y.Scale - x.Scale, true);
else if (y.Scale > x.Scale)
y = SybaseDecimal.AdjustScale(y, x.Scale - y.Scale, true);
for (int i = 0; i < 4; i += 1)
{
if (x.Data[i] != y.Data[i])
return new SybaseBoolean (true);
}
return new SybaseBoolean (false);
}
public static SybaseBoolean operator < (SybaseDecimal x, SybaseDecimal y)
{
if (x.IsNull || y.IsNull)
return SybaseBoolean.Null;
if (x.Scale > y.Scale)
x = SybaseDecimal.AdjustScale(x, y.Scale - x.Scale, true);
else if (y.Scale > x.Scale)
y = SybaseDecimal.AdjustScale(y, x.Scale - y.Scale, true);
for (int i = 3; i >= 0; i -= 1)
{
if (x.Data[i] == 0 && y.Data[i] == 0)
continue;
return new SybaseBoolean (x.Data[i] < y.Data[i]);
}
return new SybaseBoolean (false);
}
public static SybaseBoolean operator <= (SybaseDecimal x, SybaseDecimal y)
{
if (x.IsNull || y.IsNull)
return SybaseBoolean.Null;
if (x.Scale > y.Scale)
x = SybaseDecimal.AdjustScale(x, y.Scale - x.Scale, true);
else if (y.Scale > x.Scale)
y = SybaseDecimal.AdjustScale(y, x.Scale - y.Scale, true);
for (int i = 3; i >= 0; i -= 1)
{
if (x.Data[i] == 0 && y.Data[i] == 0)
continue;
else
return new SybaseBoolean (x.Data[i] <= y.Data[i]);
}
return new SybaseBoolean (true);
}
public static SybaseDecimal operator * (SybaseDecimal x, SybaseDecimal y)
{
// adjust the scale to the smaller of the two beforehand
if (x.Scale > y.Scale)
x = SybaseDecimal.AdjustScale(x, y.Scale - x.Scale, true);
else if (y.Scale > x.Scale)
y = SybaseDecimal.AdjustScale(y, x.Scale - y.Scale, true);
// set the precision to the greater of the two
byte resultPrecision;
if (x.Precision > y.Precision)
resultPrecision = x.Precision;
else
resultPrecision = y.Precision;
int[] xData = x.Data;
int[] yData = y.Data;
int[] resultBits = new int[4];
ulong res;
ulong carry = 0;
// multiply one at a time, and carry the results over to the next
for (int i = 0; i < 4; i +=1)
{
carry = 0;
res = (ulong)(xData[i]) * (ulong)(yData[i]) + carry;
if (res > Int32.MaxValue)
{
carry = res - Int32.MaxValue;
res = Int32.MaxValue;
}
resultBits [i] = (int)res;
}
// if we have carry left, then throw an exception
if (carry > 0)
throw new OverflowException ();
else
return new SybaseDecimal (resultPrecision, x.Scale, (x.IsPositive == y.IsPositive), resultBits);
}
public static SybaseDecimal operator - (SybaseDecimal x, SybaseDecimal y)
{
if (x.IsPositive && !y.IsPositive) return x + y;
if (!x.IsPositive && y.IsPositive) return -(x + y);
if (!x.IsPositive && !y.IsPositive) return y - x;
// otherwise, x is positive and y is positive
bool resultPositive = (bool)(x > y);
int[] yData = y.Data;
for (int i = 0; i < 4; i += 1) yData[i] = -yData[i];
SybaseDecimal yInverse = new SybaseDecimal (y.Precision, y.Scale, y.IsPositive, yData);
if (resultPositive)
return x + yInverse;
else
return -(x + yInverse);
}
public static SybaseDecimal operator - (SybaseDecimal n)
{
return new SybaseDecimal (n.Precision, n.Scale, !n.IsPositive, n.Data);
}
public static explicit operator SybaseDecimal (SybaseBoolean x)
{
if (x.IsNull)
return Null;
else
return new SybaseDecimal ((decimal)x.ByteValue);
}
public static explicit operator Decimal (SybaseDecimal n)
{
return n.Value;
}
public static explicit operator SybaseDecimal (SybaseDouble x)
{
if (x.IsNull)
return Null;
else
return new SybaseDecimal ((decimal)x.Value);
}
public static explicit operator SybaseDecimal (SybaseSingle x)
{
if (x.IsNull)
return Null;
else
return new SybaseDecimal ((decimal)x.Value);
}
[MonoTODO]
public static explicit operator SybaseDecimal (SybaseString x)
{
throw new NotImplementedException ();
}
public static implicit operator SybaseDecimal (decimal x)
{
return new SybaseDecimal (x);
}
public static implicit operator SybaseDecimal (SybaseByte x)
{
if (x.IsNull)
return Null;
else
return new SybaseDecimal ((decimal)x.Value);
}
public static implicit operator SybaseDecimal (SybaseInt16 x)
{
if (x.IsNull)
return Null;
else
return new SybaseDecimal ((decimal)x.Value);
}
public static implicit operator SybaseDecimal (SybaseInt32 x)
{
if (x.IsNull)
return Null;
else
return new SybaseDecimal ((decimal)x.Value);
}
public static implicit operator SybaseDecimal (SybaseInt64 x)
{
if (x.IsNull)
return Null;
else
return new SybaseDecimal ((decimal)x.Value);
}
public static implicit operator SybaseDecimal (SybaseMoney x)
{
if (x.IsNull)
return Null;
else
return new SybaseDecimal ((decimal)x.Value);
}
#endregion
}
}
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