67 lines
1.5 KiB
C#
67 lines
1.5 KiB
C#
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namespace System;
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internal static class DecimalDecCalc
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{
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private static uint D32DivMod1E9(uint hi32, ref uint lo32)
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{
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ulong num = ((ulong)hi32 << 32) | lo32;
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lo32 = (uint)(num / 1000000000);
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return (uint)(num % 1000000000);
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}
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internal static uint DecDivMod1E9(ref MutableDecimal value)
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{
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return D32DivMod1E9(D32DivMod1E9(D32DivMod1E9(0u, ref value.High), ref value.Mid), ref value.Low);
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}
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internal static void DecAddInt32(ref MutableDecimal value, uint i)
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{
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if (D32AddCarry(ref value.Low, i) && D32AddCarry(ref value.Mid, 1u))
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{
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D32AddCarry(ref value.High, 1u);
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}
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}
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private static bool D32AddCarry(ref uint value, uint i)
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{
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uint num = value;
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uint num2 = (value = num + i);
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if (num2 >= num)
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{
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return num2 < i;
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}
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return true;
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}
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internal static void DecMul10(ref MutableDecimal value)
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{
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MutableDecimal d = value;
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DecShiftLeft(ref value);
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DecShiftLeft(ref value);
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DecAdd(ref value, d);
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DecShiftLeft(ref value);
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}
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private static void DecShiftLeft(ref MutableDecimal value)
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{
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uint num = (((value.Low & 0x80000000u) != 0) ? 1u : 0u);
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uint num2 = (((value.Mid & 0x80000000u) != 0) ? 1u : 0u);
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value.Low <<= 1;
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value.Mid = (value.Mid << 1) | num;
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value.High = (value.High << 1) | num2;
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}
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private static void DecAdd(ref MutableDecimal value, MutableDecimal d)
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{
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if (D32AddCarry(ref value.Low, d.Low) && D32AddCarry(ref value.Mid, 1u))
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{
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D32AddCarry(ref value.High, 1u);
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}
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if (D32AddCarry(ref value.Mid, d.Mid))
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{
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D32AddCarry(ref value.High, 1u);
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}
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D32AddCarry(ref value.High, d.High);
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}
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}
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