private IEnumerable <byte> PackValue(DbfField field, object value)
{
Debug.WriteLine($"* V {field.Name} {_recordOffset + field.Displacement:X4}");
switch (field.Type)
{
case DbfFieldType.Character:
{
if (!(value is string s))
{
throw new InvalidCastException(field.Name);
}
if (s.Length > field.Length)
{
throw new InvalidCastException(field.Name);
}
return(ToBytes(s, field.Length));
}
case DbfFieldType.Date:
{
var d = (DateTime)value;
var s = $"{d.Year:0000}{d.Month:00}{d.Day:00}";
var bytes = Encoding.Default.GetBytes(s);
return(bytes);
}
case DbfFieldType.Numeric:
case DbfFieldType.Float:
{
var d = (decimal)Convert.ChangeType(value, typeof(decimal));
var s = d.ToString("F" + field.Precision, CultureInfo.InvariantCulture.NumberFormat);
if (s.Length > field.Length)
{
throw new InvalidCastException(field.Name);
}
s = new string(' ', field.Length - s.Length) + s; // justify right
return(ToBytes(s, field.Length));
}
case DbfFieldType.Logical:
return(new[] { (bool)value ? (byte)'T' : (byte)'F' });
case DbfFieldType.Integer:
{
var v = (int)value;
return(BitConverter.GetBytes(Helper.SwapEndianness(v)));
}
default:
throw new ArgumentOutOfRangeException(field.Type.ToString());
}
IEnumerable <byte> ToBytes(string s, int length)
{
var bytes = Encoding.Default.GetBytes(s);
foreach (var b in bytes)
{
yield return(b);
}
// fill with blanks
var n = field.Length - bytes.Length;
while (n-- > 0)
{
yield return((byte)' ');
}
}
}
public void AddField(DbfField field)
{
field.Displacement = CurrentRecordSize();
_fields.Add(field);
}
