Esempio n. 1
0
        public static bool TryFromStream(Stream stream, out DescriptorTag result)
        {
            byte[] next = Utilities.ReadFully(stream, 512);
            if (!DescriptorTag.IsValid(next, 0))
            {
                result = null;
                return(false);
            }

            DescriptorTag dt = new DescriptorTag();

            dt.ReadFrom(next, 0);

            result = dt;
            return(true);
        }
Esempio n. 2
0
        public int ReadFrom(byte[] buffer, int offset)
        {
            if (!DescriptorTag.IsValid(buffer, offset))
            {
                throw new InvalidDataException("Invalid Anchor Volume Descriptor Pointer (invalid tag)");
            }

            Tag = new DescriptorTag();
            Tag.ReadFrom(buffer, offset);

            if (UdfUtilities.ComputeCrc(buffer, offset + Tag.Size, Tag.DescriptorCrcLength) != Tag.DescriptorCrc)
            {
                throw new InvalidDataException("Invalid Anchor Volume Descriptor Pointer (invalid CRC)");
            }

            return(Parse(buffer, offset));
        }
Esempio n. 3
0
        protected static List <ExtendedAttributeRecord> ReadExtendedAttributes(byte[] eaData)
        {
            if (eaData != null && eaData.Length != 0)
            {
                DescriptorTag eaTag = new DescriptorTag();
                eaTag.ReadFrom(eaData, 0);

                int implAttrLocation = Utilities.ToInt32LittleEndian(eaData, 16);
                int appAttrLocation  = Utilities.ToInt32LittleEndian(eaData, 20);

                List <ExtendedAttributeRecord> extendedAttrs = new List <ExtendedAttributeRecord>();
                int pos = 24;
                while (pos < eaData.Length)
                {
                    ExtendedAttributeRecord ea;

                    if (pos >= implAttrLocation)
                    {
                        ea = new ImplementationUseExtendedAttributeRecord();
                    }
                    else
                    {
                        ea = new ExtendedAttributeRecord();
                    }

                    int numRead = ea.ReadFrom(eaData, pos);
                    extendedAttrs.Add(ea);

                    pos += numRead;
                }

                return(extendedAttrs);
            }
            else
            {
                return(null);
            }
        }