private DataDescriptiveRecordFields ReadDataDescriptiveRecordFields(RecordLeader leader, RecordDirectory directory)
{
var fieldArea = new DataDescriptiveRecordFields();
foreach (DirectoryEntry entry in directory)
{
bool isFileControlField = false;
int result;
if (Int32.TryParse(entry.FieldTag, out result))
{
switch (result)
{
case 0:
isFileControlField = true; //tag is 0..0 (e.g. '0000')
break;
case 1:
//Record Identifier field - this is processed as a normal DataField (or DataDescriptiveField in the DataDescriptiveRecord)
break;
case 2:
throw new NotImplementedException("Processing User application field");
case 3:
throw new NotImplementedException("Processing Announcer sequence or feature identifier field");
case 4 - 8:
throw new NotImplementedException("Processing Special field tag reserved for future standardisation - " + entry.FieldTag);
case 9:
throw new NotImplementedException("Processing Recursive tree LINKS field");
}
}
if (isFileControlField)
{
//This is a special field tag - the file control field
byte[] fieldControls = bufferedReader.ReadBytes(leader.FieldControlLength);
string externalFileTitle = ReadStringToTerminator();
string listOfFieldTagPairs = ReadStringToTerminator();
var fcf = new FileControlField(entry.FieldTag, fieldControls, externalFileTitle, listOfFieldTagPairs, leader.EntryMap.SizeOfTagField);
fieldArea.Add(fcf);
}
else
{
byte[] fieldControls = bufferedReader.ReadBytes(leader.FieldControlLength);
string dataFieldName = ReadStringToTerminator();
string arrayDescriptor = ReadStringToTerminator();
string formatControls = ReadStringToTerminator();
var ddf = new DataDescriptiveField(entry.FieldTag, fieldControls, dataFieldName, arrayDescriptor,
formatControls);
fieldArea.Add(ddf);
}
}
return(fieldArea);
}
private DataRecordFields ReadDataRecordFields(RecordLeader leader, RecordDirectory directory)
{
var fieldArea = new DataRecordFields();
foreach (DirectoryEntry entry in directory)
{
if (DataDescriptiveRecord == null)
{
throw new NotImplementedException(
"Processing a Data Record before the Data Descriptive Record is set");
}
DataDescriptiveRecordField dataDescriptiveField = null;
foreach (DataDescriptiveRecordField item in DataDescriptiveRecord.Fields)
{
if (item.Tag == entry.FieldTag)
{
dataDescriptiveField = item;
break;
}
}
if (dataDescriptiveField == null)
{
throw new Exception("Unable to find data descriptive field");
}
var df = new DataField(entry.FieldTag, (DataDescriptiveField)dataDescriptiveField, bufferedReader.ReadBytes(entry.FieldLength));
fieldArea.Add(df);
}
return(fieldArea);
}
private RecordDirectory ReadRecordDirectory(RecordLeader leader)
{
int count = 0;
for (int i = currentFileOffset; i < m_fileByteArray.Length; i++)
{
if (m_fileByteArray[currentFileOffset + count] == FieldTerminator)
{
break;
}
count++;
}
ArraySegment <byte> bytes = new ArraySegment <byte>(m_fileByteArray, currentFileOffset, count);
currentFileOffset += count + 1;
return(new RecordDirectory(leader.EntryMap.SizeOfTagField, leader.EntryMap.SizeOfLengthField,
leader.EntryMap.SizeOfPositionField, bytes));
}
private DataRecordFields ReadDataRecordFields(RecordLeader leader, RecordDirectory directory)
{
var fieldArea = new DataRecordFields();
foreach (DirectoryEntry entry in directory)
{
if (DataDescriptiveRecord == null)
{
throw new NotImplementedException(
"Processing a Data Record before the Data Descriptive Record is set");
}
DataDescriptiveRecordField dataDescriptiveField = null;
foreach (DataDescriptiveRecordField item in DataDescriptiveRecord.Fields)
{
if (item.Tag == entry.FieldTag)
{
dataDescriptiveField = item;
break;
}
}
if (dataDescriptiveField == null)
{
throw new Exception("Unable to find data descriptive field");
}
ArraySegment <byte> temp = new ArraySegment <byte>(m_fileByteArray, currentFileOffset, entry.FieldLength);
currentFileOffset += entry.FieldLength;
var df = new DataField(entry.FieldTag, (DataDescriptiveField)dataDescriptiveField, temp);
fieldArea.Add(df);
}
return(fieldArea);
}
private RecordDirectory ReadRecordDirectory(RecordLeader leader)
{
return(new RecordDirectory(leader.EntryMap.SizeOfTagField, leader.EntryMap.SizeOfLengthField,
leader.EntryMap.SizeOfPositionField, ReadBytesToFieldTerminator()));
}
