using Org.BouncyCastle.Bcpg.Attr; using Org.BouncyCastle.Utilities.IO; using System.IO; namespace Org.BouncyCastle.Bcpg { public class UserAttributeSubpacketsParser { private readonly Stream input; public UserAttributeSubpacketsParser(Stream input) { this.input = input; } public virtual UserAttributeSubpacket ReadPacket() { int num = input.ReadByte(); if (num < 0) return null; int num2 = 0; bool forceLongLength = false; if (num < 192) num2 = num; else if (num <= 223) { num2 = (num - 192 << 8) + input.ReadByte() + 192; } else { if (num != 255) throw new IOException("unrecognised length reading user attribute sub packet"); num2 = ((input.ReadByte() << 24) | (input.ReadByte() << 16) | (input.ReadByte() << 8) | input.ReadByte()); forceLongLength = true; } int num3 = input.ReadByte(); if (num3 < 0) throw new EndOfStreamException("unexpected EOF reading user attribute sub packet"); byte[] array = new byte[num2 - 1]; if (Streams.ReadFully(input, array) < array.Length) throw new EndOfStreamException(); UserAttributeSubpacketTag userAttributeSubpacketTag = (UserAttributeSubpacketTag)num3; if (userAttributeSubpacketTag == UserAttributeSubpacketTag.ImageAttribute) return new ImageAttrib(forceLongLength, array); return new UserAttributeSubpacket(userAttributeSubpacketTag, forceLongLength, array); } } }