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Optimize big endian marshalling.

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This commit is contained in:
Natalia Portillo
2019-02-24 21:59:46 +00:00
parent 3dbf89a38c
commit acac76555d
3 changed files with 43 additions and 98 deletions
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55
DiscImageChef.Helpers/BigEndianMarshal.cs
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@@ -31,7 +31,6 @@
// ****************************************************************************/
using System;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
@@ -67,59 +66,57 @@ namespace DiscImageChef
foreach(FieldInfo fi in fieldInfo)
if(fi.FieldType == typeof(short))
{
short int16 = (short)fi.GetValue(str);
byte[] int16_b = BitConverter.GetBytes(int16);
byte[] int16_r = int16_b.Reverse().ToArray();
fi.SetValue(str, BitConverter.ToInt16(int16_r, 0));
short x = (short)fi.GetValue(str);
fi.SetValue(str, (short)((x << 8) | ((x >> 8) & 0xFF)));
}
else if(fi.FieldType == typeof(int))
{
int int32 = (int)fi.GetValue(str);
byte[] int32_b = BitConverter.GetBytes(int32);
byte[] int32_r = int32_b.Reverse().ToArray();
fi.SetValue(str, BitConverter.ToInt32(int32_r, 0));
int x = (int)fi.GetValue(str);
x = (int)(((x << 8) & 0xFF00FF00) | (((uint)x >> 8) & 0xFF00FF));
fi.SetValue(str, (int)(((uint)x << 16) | (((uint)x >> 16) & 0xFFFF)));
}
else if(fi.FieldType == typeof(long))
{
long int64 = (long)fi.GetValue(str);
byte[] int64_b = BitConverter.GetBytes(int64);
byte[] int64_r = int64_b.Reverse().ToArray();
fi.SetValue(str, BitConverter.ToInt64(int64_r, 0));
long x = (long)fi.GetValue(str);
x = ((x & 0x00000000FFFFFFFF) << 32) | (long)(((ulong)x & 0xFFFFFFFF00000000) >> 32);
x = ((x & 0x0000FFFF0000FFFF) << 16) | (long)(((ulong)x & 0xFFFF0000FFFF0000) >> 16);
x = ((x & 0x00FF00FF00FF00FF) << 8) | (long)(((ulong)x & 0xFF00FF00FF00FF00) >> 8);
fi.SetValue(str, x);
}
else if(fi.FieldType == typeof(ushort))
{
ushort uint16 = (ushort)fi.GetValue(str);
byte[] uint16_b = BitConverter.GetBytes(uint16);
byte[] uint16_r = uint16_b.Reverse().ToArray();
fi.SetValue(str, BitConverter.ToUInt16(uint16_r, 0));
ushort x = (ushort)fi.GetValue(str);
fi.SetValue(str, (ushort)((x << 8) | (x >> 8)));
}
else if(fi.FieldType == typeof(uint))
{
uint uint32 = (uint)fi.GetValue(str);
byte[] uint32_b = BitConverter.GetBytes(uint32);
byte[] uint32_r = uint32_b.Reverse().ToArray();
fi.SetValue(str, BitConverter.ToUInt32(uint32_r, 0));
uint x = (uint)fi.GetValue(str);
x = ((x << 8) & 0xFF00FF00) | ((x >> 8) & 0xFF00FF);
fi.SetValue(str, (x << 16) | (x >> 16));
}
else if(fi.FieldType == typeof(ulong))
{
ulong uint64 = (ulong)fi.GetValue(str);
byte[] uint64_b = BitConverter.GetBytes(uint64);
byte[] uint64_r = uint64_b.Reverse().ToArray();
fi.SetValue(str, BitConverter.ToUInt64(uint64_r, 0));
ulong x = (ulong)fi.GetValue(str);
x = ((x & 0x00000000FFFFFFFF) << 32) | ((x & 0xFFFFFFFF00000000) >> 32);
x = ((x & 0x0000FFFF0000FFFF) << 16) | ((x & 0xFFFF0000FFFF0000) >> 16);
x = ((x & 0x00FF00FF00FF00FF) << 8) | ((x & 0xFF00FF00FF00FF00) >> 8);
fi.SetValue(str, x);
}
else if(fi.FieldType == typeof(float))
{
float flt = (float)fi.GetValue(str);
byte[] flt_b = BitConverter.GetBytes(flt);
byte[] flt_r = flt_b.Reverse().ToArray();
fi.SetValue(str, BitConverter.ToSingle(flt_r, 0));
fi.SetValue(str, BitConverter.ToSingle(new[] {flt_b[3], flt_b[2], flt_b[1], flt_b[0]}, 0));
}
else if(fi.FieldType == typeof(double))
{
double dbl = (double)fi.GetValue(str);
byte[] dbl_b = BitConverter.GetBytes(dbl);
byte[] dbl_r = dbl_b.Reverse().ToArray();
fi.SetValue(str, BitConverter.ToDouble(dbl_r, 0));
fi.SetValue(str,
BitConverter
.ToDouble(new[] {dbl_b[7], dbl_b[6], dbl_b[5], dbl_b[4], dbl_b[3], dbl_b[2], dbl_b[1], dbl_b[0]},
0));
}
else if(fi.FieldType == typeof(byte) || fi.FieldType == typeof(sbyte))
{