public byte[] ReadSectors(long firstSectorIndex, int count)
{
if (m_attributeRecord is NonResidentAttributeRecord)
{
NonResidentAttributeData attributeData = new NonResidentAttributeData(m_volume, m_fileRecord, (NonResidentAttributeRecord)m_attributeRecord);
return(attributeData.ReadSectors(firstSectorIndex, count));
}
else
{
byte[] data = ((ResidentAttributeRecord)m_attributeRecord).Data;
long totalSectors = (long)Math.Ceiling((double)data.Length / m_volume.BytesPerSector);
long highestSectorIndex = Math.Max(totalSectors - 1, 0);
if (firstSectorIndex < 0 || firstSectorIndex > highestSectorIndex)
{
throw new ArgumentOutOfRangeException("firstSectorIndex is not within the valid range");
}
int offset = (int)firstSectorIndex * m_volume.BytesPerSector;
int bytesToRead;
if (offset + count * m_volume.BytesPerSector <= data.Length)
{
bytesToRead = count * m_volume.BytesPerCluster;
}
else
{
bytesToRead = data.Length - offset;
}
return(ByteReader.ReadBytes(data, offset, bytesToRead));
}
}
private IndexRecord ReadIndexRecord(long subnodeVBN)
{
long sectorIndex = ConvertToSectorIndex(subnodeVBN);
byte[] recordBytes = m_indexAllocationData.ReadSectors(sectorIndex, this.SectorsPerIndexRecord);
IndexRecord record = new IndexRecord(recordBytes, 0);
return(record);
}
internal IndexRecord ReadIndexRecord(long subnodeVBN)
{
long sectorIndex = ConvertToSectorIndex(subnodeVBN);
byte[] recordBytes = m_indexAllocationData.ReadSectors(sectorIndex, this.SectorsPerIndexRecord);
MultiSectorHelper.RevertUsaProtection(recordBytes, 0);
IndexRecord record = new IndexRecord(recordBytes, 0);
return(record);
}
