public DynamicMessage Decode(string path, Stream stream)
{
lastError.Clear();
DynamicMessage ret = Create(path);
if (null == ret)
{
lastError.AddLast(string.Format("invalid protocol path {0}", path));
return(null);
}
if (false == ret.Parse(stream))
{
lastError.AddLast(ret.LastError);
return(null);
}
return(ret);
}
public DynamicMessage Decode(DynamicMessage.MsgDiscriptor out_desc, Stream stream)
{
lastError.Clear();
DynamicMessage ret = Create(out_desc);
if (null == ret)
{
lastError.AddLast(string.Format("invalid protocol path {0}.{1}", out_desc.Package, out_desc.Protocol));
return(null);
}
if (false == ret.Parse(stream))
{
lastError.AddLast(ret.LastError);
return(null);
}
return(ret);
}
/// <summary>
/// 解析protobuf数据
/// </summary>
/// <param name="reader"></param>
/// <see cref="https://developers.google.com/protocol-buffers/docs/encoding"/>
/// <returns>全部成功返回true，部分失败或全失败返回false，这时候可以通过LastError获取失败信息</returns>
public bool Parse(ProtoReader reader)
{
buildIndex();
lastError.Clear();
try {
int field_id;
SubItemToken token;
while ((field_id = reader.ReadFieldHeader()) != 0)
{
WireType pb_type = reader.WireType;
FieldDescriptorProto desc;
if (false == msgDescriptor.FieldIdIndex.TryGetValue(field_id, out desc))
{
// unknown field skipped
reader.SkipField();
continue;
}
// 类型校验
try {
switch (desc.type)
{
case FieldDescriptorProto.Type.TYPE_DOUBLE:
insertField(desc, reader.ReadDouble());
break;
case FieldDescriptorProto.Type.TYPE_FLOAT:
insertField(desc, reader.ReadSingle());
break;
case FieldDescriptorProto.Type.TYPE_INT64:
case FieldDescriptorProto.Type.TYPE_SINT64:
case FieldDescriptorProto.Type.TYPE_SFIXED64:
insertField(desc, reader.ReadInt64());
break;
case FieldDescriptorProto.Type.TYPE_UINT64:
case FieldDescriptorProto.Type.TYPE_FIXED64:
insertField(desc, reader.ReadUInt64());
break;
case FieldDescriptorProto.Type.TYPE_INT32:
case FieldDescriptorProto.Type.TYPE_SINT32:
case FieldDescriptorProto.Type.TYPE_SFIXED32:
insertField(desc, reader.ReadInt32());
break;
case FieldDescriptorProto.Type.TYPE_BOOL:
insertField(desc, reader.ReadBoolean());
break;
case FieldDescriptorProto.Type.TYPE_STRING:
insertField(desc, reader.ReadString());
break;
//case FieldDescriptorProto.Type.TYPE_GROUP: // deprecated
// break;
case FieldDescriptorProto.Type.TYPE_MESSAGE:
token = ProtoReader.StartSubItem(reader);
try {
DynamicMessage sub_msg = CreateMessage(desc);
if (null == sub_msg)
{
lastError.AddLast(string.Format("{0}.{1}.{2} => invalid message path {3}", msgDescriptor.Package, msgDescriptor.Protocol.name, desc.name, pickMsgName(desc)));
break;
}
if (false == sub_msg.Parse(reader))
{
lastError.AddLast(sub_msg.LastError);
}
else
{
insertField(desc, sub_msg);
}
} catch (Exception e) {
lastError.AddLast(string.Format("{0}.{1}.{2} => {3}", msgDescriptor.Package, msgDescriptor.Protocol.name, desc.name, e.Message));
}
ProtoReader.EndSubItem(token, reader);
break;
case FieldDescriptorProto.Type.TYPE_BYTES:
insertField(desc, ProtoReader.AppendBytes(null, reader));
break;
case FieldDescriptorProto.Type.TYPE_FIXED32:
case FieldDescriptorProto.Type.TYPE_UINT32:
insertField(desc, reader.ReadUInt32());
break;
case FieldDescriptorProto.Type.TYPE_ENUM:
insertField(desc, reader.ReadInt32());
break;
default:
// unsupported field
lastError.AddLast(string.Format("field type {0} in {1}.{2}.{3} unsupported", desc.type.ToString(), msgDescriptor.Package, msgDescriptor.Protocol.name, desc.name));
reader.SkipField();
break;
}
} catch (Exception e) {
lastError.AddLast(string.Format("{0}.{1}.{2} {3}", msgDescriptor.Package, msgDescriptor.Protocol.name, desc.name, e.ToString()));
reader.SkipField();
}
}
} catch (Exception e) {
lastError.AddLast(e.Message);
}
return(0 == lastError.Count);
}