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using System;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
using System.Buffers.Binary;
#endif
namespace Org.BouncyCastle.Math.EC.Rfc8032
{
internal static class Codec
{
internal static uint Decode16(byte[] bs, int off)
{
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
return BinaryPrimitives.ReadUInt16LittleEndian(bs.AsSpan(off));
#else
uint n = bs[off];
n |= (uint)bs[++off] << 8;
return n;
#endif
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal static uint Decode16(ReadOnlySpan<byte> bs)
{
return BinaryPrimitives.ReadUInt16LittleEndian(bs);
}
#endif
internal static uint Decode24(byte[] bs, int off)
{
uint n = bs[off];
n |= (uint)bs[++off] << 8;
n |= (uint)bs[++off] << 16;
return n;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal static uint Decode24(ReadOnlySpan<byte> bs)
{
uint n = bs[0];
n |= (uint)bs[1] << 8;
n |= (uint)bs[2] << 16;
return n;
}
#endif
internal static uint Decode32(byte[] bs, int off)
{
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
return BinaryPrimitives.ReadUInt32LittleEndian(bs.AsSpan(off));
#else
uint n = bs[off];
n |= (uint)bs[++off] << 8;
n |= (uint)bs[++off] << 16;
n |= (uint)bs[++off] << 24;
return n;
#endif
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal static uint Decode32(ReadOnlySpan<byte> bs)
{
return BinaryPrimitives.ReadUInt32LittleEndian(bs);
}
#endif
internal static void Decode32(byte[] bs, int bsOff, uint[] n, int nOff, int nLen)
{
for (int i = 0; i < nLen; ++i)
{
n[nOff + i] = Decode32(bs, bsOff + i * 4);
}
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal static void Decode32(ReadOnlySpan<byte> bs, Span<uint> n)
{
for (int i = 0; i < n.Length; ++i)
{
n[i] = Decode32(bs[(i * 4)..]);
}
}
#endif
internal static void Encode24(uint n, byte[] bs, int off)
{
bs[off] = (byte)(n);
bs[++off] = (byte)(n >> 8);
bs[++off] = (byte)(n >> 16);
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal static void Encode24(uint n, Span<byte> bs)
{
bs[0] = (byte)(n);
bs[1] = (byte)(n >> 8);
bs[2] = (byte)(n >> 16);
}
#endif
internal static void Encode32(uint n, byte[] bs, int off)
{
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
BinaryPrimitives.WriteUInt32LittleEndian(bs.AsSpan(off), n);
#else
bs[ off] = (byte)(n );
bs[++off] = (byte)(n >> 8);
bs[++off] = (byte)(n >> 16);
bs[++off] = (byte)(n >> 24);
#endif
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal static void Encode32(uint n, Span<byte> bs)
{
BinaryPrimitives.WriteUInt32LittleEndian(bs, n);
}
#endif
internal static void Encode56(ulong n, byte[] bs, int off)
{
Encode32((uint)n, bs, off);
Encode24((uint)(n >> 32), bs, off + 4);
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal static void Encode56(ulong n, Span<byte> bs)
{
Encode32((uint)n, bs);
Encode24((uint)(n >> 32), bs[4..]);
}
#endif
}
}
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