private static void ValidatePart(YencArticle article, ICollection <ValidationFailure> failures)
{
YencHeader header = article.Header;
YencFooter footer = article.Footer;
if (header.PartNumber != footer.PartNumber)
{
failures.Add(new ValidationFailure(
YencValidationErrorCodes.PartMismatch, Resources.Yenc.PartMismatch,
new { HeaderPart = header.PartNumber, FooterPart = footer.PartNumber }));
}
if (!(footer.PartSize == article.Data.Length && footer.PartSize == header.PartSize))
{
failures.Add(new ValidationFailure(
YencValidationErrorCodes.SizeMismatch, Resources.Yenc.PartSizeMismatch,
new { DataSize = article.Data.Length, HeaderSize = header.PartSize, FooterSize = footer.PartSize }));
}
if (!footer.PartCrc32.HasValue)
{
failures.Add(new ValidationFailure(
YencValidationErrorCodes.MissingChecksum, Resources.Yenc.MissingPartChecksum));
return;
}
uint calculatedCrc32 = Crc32.CalculateChecksum(article.Data);
if (calculatedCrc32 != footer.PartCrc32.Value)
{
failures.Add(new ValidationFailure(
YencValidationErrorCodes.ChecksumMismatch, Resources.Yenc.PartChecksumMismatch,
new { CalculatedChecksum = calculatedCrc32, FooterChecksum = footer.PartCrc32 }));
}
}
/// <summary>
/// Validates the specified <see cref="YencArticle"/>.
/// </summary>
/// <param name="article">The yEnc-encoded article to validate.</param>
/// <returns>A <see cref="ValidationResult"/> containing a list of 0 or more validation failures.</returns>
public static ValidationResult Validate(YencArticle article)
{
var failures = new List <ValidationFailure>();
YencHeader header = article.Header;
YencFooter footer = article.Footer;
if (footer == null)
{
// nothing to validate
return(new ValidationResult(failures));
}
if (header.PartNumber > 0)
{
ValidatePart(article, failures);
return(new ValidationResult(failures));
}
if (footer.PartSize != article.Data.Length)
{
failures.Add(new ValidationFailure(
YencValidationErrorCodes.SizeMismatch, Resources.Yenc.SizeMismatch,
new { DataSize = article.Data.Length, FooterSize = footer.PartSize }));
}
if (!footer.Crc32.HasValue)
{
failures.Add(new ValidationFailure(
YencValidationErrorCodes.MissingChecksum, Resources.Yenc.MissingChecksum));
return(new ValidationResult(failures));
}
uint calculatedCrc32 = Crc32.CalculateChecksum(article.Data);
if (calculatedCrc32 != footer.Crc32.Value)
{
failures.Add(new ValidationFailure(
YencValidationErrorCodes.ChecksumMismatch, Resources.Yenc.ChecksumMismatch,
new { CalculatedChecksum = calculatedCrc32, FooterChecksum = footer.Crc32.Value }));
}
return(new ValidationResult(failures));
}
public void Validate(YEncHeader header, MemoryBlockStream decodedPartStream)
{
if (!MatchesPart(header))
{
throw new YEncException($"Part mismatch. Expected {header.Part}, but got {Part}.");
}
if (Size != decodedPartStream.Length)
{
throw new YEncException($"Size mismatch. Expected {Size}, but got {decodedPartStream.Length}.");
}
var crc32 = Crc33 ?? PartCrc32;
if (crc32.HasValue)
{
var calculatedCrc32 = Crc32.CalculateChecksum(decodedPartStream.ToArray());
if (calculatedCrc32 != crc32.Value)
{
throw new YEncException($"Checksum mismatch. Expected {crc32.Value}, but got {calculatedCrc32}.");
}
}
}
