private void ReadFromBuffer(ref ReadOnlySequence <byte> buffer, ParsingData parsingData)
{
while (TryReadLine(ref buffer, out ReadOnlySequence <byte> sequence))
{
IParsedLine parsedLine = ProcessSequence(
sequence, ref parsingData.CurrentOffset, parsingData.ParseMode);
if (parsedLine == null)
{
continue;
}
if (parsedLine.ParseMode == ParseMode.Regular &&
parsedLine is ObjectDataParsedLine objectDataParsedLine)
{
parsingData.PdfObjects.Add(objectDataParsedLine.ObjectData);
}
if (parsedLine.ParseMode == ParseMode.InsideXref &&
parsedLine is XRefTableHeaderParsedLine xRefTableHeaderParsedLine)
{
parsingData.CurrentXRefTableFirstObjectNumber =
xRefTableHeaderParsedLine.FirstObjectNumber;
parsingData.CurrentXRefTableSize =
xRefTableHeaderParsedLine.TableSize;
parsingData.CurrentXRefTableObjectNumberIndex = 0;
}
if (parsedLine.ParseMode == ParseMode.InsideXref &&
parsedLine is ObjectDataParsedLine xrefObjectDataParsedLine)
{
parsingData.XRefObjects.Add(
new ObjectData(
parsingData.CurrentXRefTableObjectNumberIndex + parsingData.CurrentXRefTableFirstObjectNumber,
xrefObjectDataParsedLine.ObjectData.ObjectGeneration,
xrefObjectDataParsedLine.ObjectData.ObjectOffset));
parsingData.CurrentXRefTableObjectNumberIndex++;
}
parsingData.ParseMode = parsedLine.ParseMode;
}
}
public async Task <ValidationResult> Validate(string file)
{
using (FileStream stream = File.OpenRead(file))
{
PipeReader reader = PipeReader.Create(stream);
ParsingData parsingData = new ParsingData();
bool isReadComplete = false;
while (!isReadComplete)
{
ReadResult read = await reader.ReadAsync();
ReadOnlySequence <byte> buffer = read.Buffer;
ReadFromBuffer(ref buffer, parsingData);
reader.AdvanceTo(buffer.Start, buffer.End);
isReadComplete = read.IsCompleted;
}
return(ValidatePdfObjectsToXrefObjects(parsingData.PdfObjects, parsingData.XRefObjects));
}
}