22 lines
914 B
C#
22 lines
914 B
C#
namespace LibAtrac9.Utilities
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{
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internal static class Bit
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{
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private static uint BitReverse32(uint value)
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{
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value = ((value & 0xaaaaaaaa) >> 1) | ((value & 0x55555555) << 1);
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value = ((value & 0xcccccccc) >> 2) | ((value & 0x33333333) << 2);
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value = ((value & 0xf0f0f0f0) >> 4) | ((value & 0x0f0f0f0f) << 4);
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value = ((value & 0xff00ff00) >> 8) | ((value & 0x00ff00ff) << 8);
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return (value >> 16) | (value << 16);
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}
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private static uint BitReverse32(uint value, int bitCount) => BitReverse32(value) >> (32 - bitCount);
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public static int BitReverse32(int value, int bitCount) => (int) BitReverse32((uint) value, bitCount);
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public static int SignExtend32(int value, int bits)
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{
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int shift = 8 * sizeof(int) - bits;
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return (value << shift) >> shift;
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}
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}
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}
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