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70 lines
2.1 KiB
70 lines
2.1 KiB
1 year ago
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#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.IO;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Bcpg.Attr;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities.IO;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Bcpg
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{
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/**
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* reader for user attribute sub-packets
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*/
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public class UserAttributeSubpacketsParser
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{
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private readonly Stream input;
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public UserAttributeSubpacketsParser(
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Stream input)
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{
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this.input = input;
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}
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public virtual UserAttributeSubpacket ReadPacket()
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{
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int l = input.ReadByte();
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if (l < 0)
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return null;
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int bodyLen = 0;
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bool longLength = false;
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if (l < 192)
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{
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bodyLen = l;
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}
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else if (l <= 223)
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{
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bodyLen = ((l - 192) << 8) + (input.ReadByte()) + 192;
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}
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else if (l == 255)
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{
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bodyLen = (input.ReadByte() << 24) | (input.ReadByte() << 16)
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| (input.ReadByte() << 8) | input.ReadByte();
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longLength = true;
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}
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else
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{
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throw new IOException("unrecognised length reading user attribute sub packet");
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}
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int tag = input.ReadByte();
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if (tag < 0)
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throw new EndOfStreamException("unexpected EOF reading user attribute sub packet");
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byte[] data = new byte[bodyLen - 1];
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if (Streams.ReadFully(input, data) < data.Length)
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throw new EndOfStreamException();
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UserAttributeSubpacketTag type = (UserAttributeSubpacketTag) tag;
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switch (type)
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{
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case UserAttributeSubpacketTag.ImageAttribute:
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return new ImageAttrib(longLength, data);
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}
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return new UserAttributeSubpacket(type, longLength, data);
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}
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}
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}
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#pragma warning restore
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#endif
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