private int ReadField(Context context, CharString field, int fieldIndex, ArrayList fieldValues, out object fieldValue)
{
fieldValue = null;
byte[] buffer = context.Buffer;
int length = field.CharWidthSpecified ? field.CharWidth : context.CharWidth;
int num2 = field.LengthSpecified ? field.Length : -1;
if (field.GetType() == typeof(Ascii))
{
length = 1;
}
else if (field.GetType() == typeof(Unicode))
{
length = 2;
}
if (field.CharCountRef != null)
{
num2 = this.ReadReference(context, field, fieldIndex, fieldValues, field.CharCountRef);
}
if (num2 == -1)
{
num2 = 0;
for (int i = context.Index; i < ((context.Buffer.Length - length) + 1); i += length)
{
num2++;
bool flag = true;
for (int j = 0; j < length; j++)
{
if (context.Buffer[i + j] != 0)
{
flag = false;
break;
}
}
if (flag)
{
break;
}
}
}
if ((buffer.Length - context.Index) < (length * num2))
{
throw new InvalidDataInBufferException("Unexpected end of buffer.");
}
if (length > 2)
{
byte[] bytes = new byte[num2 * length];
for (int k = 0; k < (num2 * length); k++)
{
bytes[k] = buffer[context.Index + k];
}
if (context.BigEndian)
{
for (int m = 0; m < bytes.Length; m += length)
{
base.SwapBytes(bytes, 0, length);
}
}
fieldValue = bytes;
}
else
{
char[] chArray = new char[num2];
for (int n = 0; n < num2; n++)
{
if (length == 1)
{
chArray[n] = System.Convert.ToChar(buffer[context.Index + n]);
}
else
{
byte[] buffer3 = new byte[] { buffer[context.Index + (2 * n)], buffer[(context.Index + (2 * n)) + 1] };
if (context.BigEndian)
{
base.SwapBytes(buffer3, 0, 2);
}
chArray[n] = BitConverter.ToChar(buffer3, 0);
}
}
fieldValue = new string(chArray).TrimEnd(new char[1]);
}
return(num2 * length);
}
private int WriteField(Context context, CharString field, int fieldIndex, ComplexValue[] fieldValues, object fieldValue)
{
byte[] bytes = context.Buffer;
int length = field.CharWidthSpecified ? field.CharWidth : context.CharWidth;
int count = field.LengthSpecified ? field.Length : -1;
if (field.GetType() == typeof(Ascii))
{
length = 1;
}
else if (field.GetType() == typeof(Unicode))
{
length = 2;
}
byte[] buffer2 = null;
if (count == -1)
{
if (length > 2)
{
if (fieldValue.GetType() != typeof(byte[]))
{
throw new InvalidDataToWriteException("Field value is not a byte array.");
}
buffer2 = (byte[])fieldValue;
count = buffer2.Length / length;
}
else
{
if (fieldValue.GetType() != typeof(string))
{
throw new InvalidDataToWriteException("Field value is not a string.");
}
string str = (string)fieldValue;
count = str.Length + 1;
if (length == 1)
{
count = 1;
foreach (char ch in str)
{
count++;
if (BitConverter.GetBytes(ch)[1] != 0)
{
count++;
}
}
}
}
}
if (field.CharCountRef != null)
{
this.WriteReference(context, field, fieldIndex, fieldValues, field.CharCountRef, count);
}
if (bytes != null)
{
if (buffer2 == null)
{
string str2 = (string)fieldValue;
buffer2 = new byte[length * count];
int num3 = 0;
for (int j = 0; j < str2.Length; j++)
{
if (num3 >= buffer2.Length)
{
break;
}
byte[] buffer4 = BitConverter.GetBytes(str2[j]);
buffer2[num3++] = buffer4[0];
if ((length == 2) || (buffer4[1] != 0))
{
buffer2[num3++] = buffer4[1];
}
}
}
if ((bytes.Length - context.Index) < buffer2.Length)
{
throw new InvalidDataToWriteException("Unexpected end of buffer.");
}
for (int i = 0; i < buffer2.Length; i++)
{
bytes[context.Index + i] = buffer2[i];
}
if (context.BigEndian && (length > 1))
{
for (int k = 0; k < buffer2.Length; k += length)
{
base.SwapBytes(bytes, context.Index + k, length);
}
}
}
return(count * length);
}