/// <summary>
/// Handler字典类的解码函数
/// </summary>
/// <param name="source">待解码的字节数组</param>
/// <param name="position">字节数组的解码位置</param>
/// <returns>解码的字节数组长度</returns>
public override int Decode(byte[] source, ref int position)
{
//保存初始位置
int start = position;
//跳过字符'['
position++;
try
{
//当遇到']'(ASCII码为93),解析结束
while (source[position] != 93)
{
//解析字符串
BytesNode keyNode = new BytesNode();
keyNode.Decode(source, ref position);
byte[] key = keyNode.ByteArray;
if (key.LongLength == 0)
{
throw new BEncodingException(ExDictNodeKeyLengthError);
}
//解析值节点
BEncodedNode valueNode = BEncode.Decode(source, ref position);
//']'(ASCII码为93),解析结束
if (valueNode == null)
{
throw new BEncodingException(ExDictNodeValueIsNull);
}
//字典添加key和handler
dict.Add(keyNode, valueNode);
}
}
//当捕捉IndexOutOfRangeException,抛出BEncodingException
catch (IndexOutOfRangeException)
{
throw new BEncodingException(ExDictNodeLengthError);
}
//当捕捉ArgumentException,抛出BEncodingException
catch (ArgumentException)
{
throw new BEncodingException(ExDictNodeSameKey);
}
//跳过字符'e'
position++;
//返回所解析的数组长度
return(position - start);
}
/// <summary>
/// </summary>
/// <param name="source">待解码的字节数组</param>
/// <param name="position">字节数组的解码位置</param>
/// <returns>解码的字节数组长度</returns>
public override int Decode(byte[] source, ref int position)
{
//保存初始位置
int start = position;
//跳过字符'{'
position++;
try
{
//当遇到'}'(ASCII码为125),解析结束
while (source[position] != 125)
{
BEncodedNode node = BEncode.Decode(source, ref position);
//当遇到'}'(ASCII码为93125解析结束
if (node == null)
{
break;
}
//列表添加handler
items.Add(node);
}
}
//当捕捉IndexOutOfRangeException,抛出BEncodingException
catch (IndexOutOfRangeException)
{
throw new BEncodingException(ExListNodeLengthError);
}
//跳过字符'e'
position++;
//返回所解析的数组长度
return(position - start);
}