public static DbaseField Read(BinaryReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
var name = new DbaseFieldName(reader.ReadRightPaddedString(11, char.MinValue));
var typeOfField = reader.ReadByte();
if (!Enum.IsDefined(typeof(DbaseFieldType), typeOfField))
{
var values = Enum.GetValues(typeof(DbaseFieldType));
var supportedValues = string.Join(
",",
Enumerable
.Range(0, values.Length)
.Select(index =>
values.GetValue(index).ToString() + "[" + ((byte)values.GetValue(index)).ToString() + "]")
);
throw new DbaseFileHeaderException(
$"The field type {typeOfField} of field {name} is not supported ({supportedValues}).");
}
var fieldType = (DbaseFieldType)typeOfField;
var offset = new ByteOffset(reader.ReadInt32());
var length = new DbaseFieldLength(reader.ReadByte());
var decimalCount = new DbaseDecimalCount(reader.ReadByte());
reader.ReadBytes(14);
return(new DbaseField(name, fieldType, offset, length, decimalCount));
}
public void ToInt32ReturnsExpectedValue()
{
var value = Math.Abs(_fixture.Create <int>());
var sut = new ByteOffset(value);
var result = sut.ToInt32();
Assert.Equal(value, result);
}
public void LessThanOrEqualOperatorReturnsExpectedValue(int left, int right, bool expected)
{
var sut = new ByteOffset(left);
var other = new ByteOffset(right);
var result = sut <= other;
Assert.Equal(expected, result);
}
public void CompareToReturnsExpectedResult(int left, int right, int expected)
{
var sut = new ByteOffset(left);
var other = new ByteOffset(right);
var result = sut.CompareTo(other);
Assert.Equal(expected, result);
}
public DbaseField(DbaseFieldName name, DbaseFieldType fieldType, ByteOffset offset, DbaseFieldLength length,
DbaseDecimalCount decimalCount)
{
if (!Enum.IsDefined(typeof(DbaseFieldType), fieldType))
{
throw new ArgumentException(
$"The field type {fieldType} of field {name} is not supported.",
nameof(fieldType));
}
switch (fieldType)
{
case DbaseFieldType.Character:
if (decimalCount.ToInt32() != 0)
{
throw new ArgumentException(
$"The character field {name} decimal count ({decimalCount}) must be set to 0.",
nameof(decimalCount));
}
break;
case DbaseFieldType.DateTime:
if (length.ToInt32() != 15)
{
throw new ArgumentException($"The datetime field {name} length ({length}) must be set to 15.",
nameof(length));
}
if (decimalCount.ToInt32() != 0)
{
throw new ArgumentException(
$"The datetime field {name} decimal count ({decimalCount}) must be set to 0.",
nameof(decimalCount));
}
break;
case DbaseFieldType.Number:
if (length > DbaseDouble.MaximumLength)
{
throw new ArgumentException(
$"The number field {name} length ({length}) must be less than or equal to {DbaseDouble.MaximumLength}.",
nameof(length));
}
if (decimalCount.ToInt32() != 0)
{
if (length < DbaseDouble.MinimumLength)
{
throw new ArgumentException(
$"The number field {name} length ({length}) must be at least {DbaseDouble.MinimumLength}.",
nameof(length));
}
if (decimalCount > DbaseDouble.MaximumDecimalCount)
{
throw new ArgumentException(
$"The number field {name} decimal count ({decimalCount}) must be less than or equal to {DbaseDouble.MaximumDecimalCount}.",
nameof(decimalCount));
}
if (decimalCount.ToInt32() > length.ToInt32() - 2)
{
throw new ArgumentException(
$"The number field {name} decimal count ({decimalCount}) must be 2 less than its length ({length}).",
nameof(decimalCount));
}
}
break;
case DbaseFieldType.Float:
if (length > DbaseSingle.MaximumLength)
{
throw new ArgumentException(
$"The float field {name} length ({length}) must be less than or equal to {DbaseSingle.MaximumLength}.",
nameof(length));
}
if (decimalCount.ToInt32() != 0)
{
if (length < DbaseSingle.MinimumLength)
{
throw new ArgumentException(
$"The number field {name} length ({length}) must be at least {DbaseSingle.MinimumLength}.",
nameof(length));
}
if (decimalCount > DbaseSingle.MaximumDecimalCount)
{
throw new ArgumentException(
$"The float field {name} decimal count ({decimalCount}) must be less than or equal to {DbaseSingle.MaximumDecimalCount}.",
nameof(decimalCount));
}
if (decimalCount.ToInt32() > length.ToInt32() - 2)
{
throw new ArgumentException(
$"The float field {name} decimal count ({decimalCount}) must be 2 less than its length ({length}).",
nameof(decimalCount));
}
}
break;
case DbaseFieldType.Logical:
if (decimalCount.ToInt32() != 0)
{
throw new ArgumentException(
$"The logical field {name} decimal count ({decimalCount}) must be set to 0.",
nameof(decimalCount));
}
if (length.ToInt32() != 1)
{
throw new ArgumentException(
$"The logical field {name} length ({length}) must be set to 1.",
nameof(length));
}
break;
}
Name = name;
FieldType = fieldType;
Offset = offset;
Length = length;
DecimalCount = decimalCount;
if (FieldType == DbaseFieldType.Number || FieldType == DbaseFieldType.Float)
{
PositiveIntegerDigits =
DecimalCount.ToInt32() != 0
? new DbaseIntegerDigits(
Length
.Minus(DecimalCount.ToLength())
.Minus(DecimalSeparatorLength)
.ToInt32()
)
: new DbaseIntegerDigits(Length.ToInt32());
NegativeIntegerDigits =
PositiveIntegerDigits != new DbaseIntegerDigits(0)
? PositiveIntegerDigits
.Minus(SignLength)
: new DbaseIntegerDigits(0);
}
else
{
PositiveIntegerDigits = new DbaseIntegerDigits(0);
NegativeIntegerDigits = new DbaseIntegerDigits(0);
}
}
public DbaseField At(ByteOffset offset) => new DbaseField(Name, FieldType, offset, Length, DecimalCount);
public DbaseField At(ByteOffset offset)
{
return(new DbaseField(Name, FieldType, offset, Length, DecimalCount));
}
