// Internal functions that parse a bit of the signature
public uint SigReadUSCompressed(ref int idx, bool us = false)
{
PEFile.StreamHeader sh = sh_blob;
if (us)
{
sh = sh_us;
}
byte b1 = sh.di.ReadByte(idx++);
if ((b1 & 0x80) == 0)
{
return(b1);
}
byte b2 = sh.di.ReadByte(idx++);
if ((b1 & 0xc0) == 0x80)
{
return((b1 & 0x3fU) << 8 | b2);
}
byte b3 = sh.di.ReadByte(idx++);
byte b4 = sh.di.ReadByte(idx++);
return((b1 & 0x1fU) << 24 | ((uint)b2 << 16) |
((uint)b3 << 8) | b4);
}
public int SigReadSCompressed(ref int idx, bool us = false)
{
PEFile.StreamHeader sh = sh_blob;
if (us)
{
sh = sh_us;
}
byte[] bval = new byte[4];
byte b1 = sh.di.ReadByte(idx++);
if ((b1 & 0x80) == 0)
{
// sign-extend (value has been left-rotated, so sign bit is in bit 0)
if ((b1 & 0x01U) == 0x01U)
{
bval[0] = (byte)((b1 >> 1) | 0xc0);
bval[1] = 0xff;
bval[2] = 0xff;
bval[3] = 0xff;
}
else
{
bval[0] = (byte)(b1 >> 1);
bval[1] = 0;
bval[2] = 0;
bval[3] = 0;
}
}
else
{
throw new NotImplementedException();
}
return(BitConverter.ToInt32(bval, 0));
/*byte b2 = sh.di.ReadByte(idx++);
* if ((b1 & 0xc0) == 0x80)
* return (b1 & 0x3fU) << 8 | b2;
*
* byte b3 = sh.di.ReadByte(idx++);
* byte b4 = sh.di.ReadByte(idx++);
* return (b1 & 0x1fU) << 24 | ((uint)b2 << 16) |
* ((uint)b3 << 8) | b4; */
}
