public QuickSerializer(
Type recordType,
DbfVersion version,
List<ColumnDefinition> columns,
int recordWidth,
bool ignoreMissingFields,
bool setOffset)
{
mVersion = version;
if (columns == null)
{
columns = new List<ColumnDefinition>();
mCreateColumns = true;
}
mColumns = columns;
mIgnoreMissingFields = ignoreMissingFields;
mRecordWidth = 0; // dbf use a character to specify deleted record
mIsFixedRecordWidth = true;
var readMethod = new DynamicMethod("__readRecord",
null,
new Type[] { typeof(IHasEncoding), typeof(Byte[]), typeof(object) },
recordType,
true);
mIlRead = readMethod.GetILGenerator();
var writeMethod = new DynamicMethod("__writeRecord",
null,
new Type[] { typeof(IHasEncoding), typeof(Byte[]), typeof(object) },
recordType,
true);
mIlWrite = writeMethod.GetILGenerator();
var compareMethod = new DynamicMethod("__compareRecord",
typeof(int),
new Type[] { typeof(IHasEncoding), typeof(object), typeof(object) },
recordType,
true);
mIlCompare = compareMethod.GetILGenerator();
EnumerateFields(recordType);
int currentOffset = 0;
int columnIndex = 0;
foreach(var cd in mColumns)
{
if (setOffset)
{
cd.mOffset = currentOffset;
currentOffset += cd.mWidth;
}
cd.ColumnIndex = columnIndex++;
EmitColumnCode(cd);
}
mRecordWidth = currentOffset;
mIlRead.Emit(OpCodes.Ret);
mIlWrite.Emit(OpCodes.Ret);
mIlCompare.Emit(OpCodes.Ldc_I4_0); // if not return yet, we can say that the records are equal
mIlCompare.Emit(OpCodes.Ret);
mQuickReadMethod = (QuickReadDelegate)readMethod.CreateDelegate(typeof(QuickReadDelegate));
mQuickWriteMethod = (QuickWriteDelegate)writeMethod.CreateDelegate(typeof(QuickWriteDelegate));
mQuickCompareMethod = (QuickCompareDelegate)compareMethod.CreateDelegate(typeof(QuickCompareDelegate));
if (recordWidth > 0) mRecordWidth = recordWidth;
}
public QuickSerializer(
Type recordType,
DbfVersion version,
List <ColumnDefinition> columns,
int recordWidth,
bool ignoreMissingFields,
bool setOffset)
{
mVersion = version;
if (columns == null)
{
columns = new List <ColumnDefinition>();
mCreateColumns = true;
}
mColumns = columns;
mIgnoreMissingFields = ignoreMissingFields;
mRecordWidth = 0; // dbf use a character to specify deleted record
mIsFixedRecordWidth = true;
var readMethod = new DynamicMethod("__readRecord",
null,
new Type[] { typeof(IHasEncoding), typeof(Byte[]), typeof(object) },
recordType,
true);
mIlRead = readMethod.GetILGenerator();
var writeMethod = new DynamicMethod("__writeRecord",
null,
new Type[] { typeof(IHasEncoding), typeof(Byte[]), typeof(object) },
recordType,
true);
mIlWrite = writeMethod.GetILGenerator();
var compareMethod = new DynamicMethod("__compareRecord",
typeof(int),
new Type[] { typeof(IHasEncoding), typeof(object), typeof(object) },
recordType,
true);
mIlCompare = compareMethod.GetILGenerator();
EnumerateFields(recordType);
int currentOffset = 0;
int columnIndex = 0;
foreach (var cd in mColumns)
{
if (setOffset)
{
cd.mOffset = currentOffset;
currentOffset += cd.mWidth;
}
cd.ColumnIndex = columnIndex++;
EmitColumnCode(cd);
}
mRecordWidth = currentOffset;
mIlRead.Emit(OpCodes.Ret);
mIlWrite.Emit(OpCodes.Ret);
mIlCompare.Emit(OpCodes.Ldc_I4_0); // if not return yet, we can say that the records are equal
mIlCompare.Emit(OpCodes.Ret);
mQuickReadMethod = (QuickReadDelegate)readMethod.CreateDelegate(typeof(QuickReadDelegate));
mQuickWriteMethod = (QuickWriteDelegate)writeMethod.CreateDelegate(typeof(QuickWriteDelegate));
mQuickCompareMethod = (QuickCompareDelegate)compareMethod.CreateDelegate(typeof(QuickCompareDelegate));
if (recordWidth > 0)
{
mRecordWidth = recordWidth;
}
}
