// 读取下一个tag的名字和类型，并不包含数据，以便接下来决策是一次读完还是分级读还是分批读
public NamedBinaryTag ReadNextHalf()
{
TagType type = ReadTagType();
NamedBinaryTag ret = NamedBinaryTag.Create(type);
if (ret.Type == TagType.End)
{
ret.name = null;
return(ret);
}
ret.name = ReadString();
return(ret);
}
public void WriteTagValue(NamedBinaryTag tag)
{
switch (tag.Type)
{
case TagType.End:
return;
case TagType.Byte:
WriteByte(tag.GetByte()); return;
case TagType.Short:
WriteShort(tag.GetShort()); return;
case TagType.Int:
WriteInt(tag.GetInt()); return;
case TagType.Long:
WriteLong(tag.GetLong()); return;
case TagType.Float:
WriteFloat(tag.GetFloat()); return;
case TagType.Double:
WriteDouble(tag.GetDouble()); return;
case TagType.ByteArray:
WriteByteArray(tag.GetByteArray()); return;
case TagType.String:
WriteString(tag.GetString()); return;
case TagType.List:
WriteList(tag.GetList(), tag.GetItemType()); return;
case TagType.Compound:
WriteCompound(tag.GetCompound()); return;
case TagType.IntArray:
WriteIntArray(tag.GetIntArray()); return;
case TagType.LongArray:
WriteLongArray(tag.GetLongArray()); return;
case TagType.None:
throw new Exception("tag type is None");
default:
throw new Exception("unknown tag type:" + (int)tag.Type);
}
}
public void WriteTag(NamedBinaryTag tag)
{
WriteHalf(tag.Type, tag.name);
WriteTagValue(tag);
}
public NamedBinaryTag FinishReadValue(NamedBinaryTag tag)
{
int readLen;
switch (tag.Type)
{
case TagType.End:
return(tag);
case TagType.Byte:
tag.SetByte(ReadByte());
return(tag);
case TagType.Short:
tag.SetShort(ReadShort());
return(tag);
case TagType.Int:
tag.SetInt(ReadInt());
return(tag);
case TagType.Long:
tag.SetLong(ReadLong());
return(tag);
case TagType.Float:
tag.SetFloat(ReadFloat());
return(tag);
case TagType.Double:
tag.SetDouble(ReadDouble());
return(tag);
case TagType.ByteArray:
readLen = ReadInt();
byte[] byteArray = new byte[readLen];
readLen = _stream.Read(byteArray, 0, byteArray.Length);
if (readLen < byteArray.Length)
{
throw new Exception("unexpected stream end");
}
tag.SetByteArray(byteArray);
return(tag);
case TagType.String:
tag.SetString(ReadString());
return(tag);
case TagType.List:
NamedBinaryTag tagItem;
TagType itemType = ReadTagType();
readLen = ReadInt();
List <NamedBinaryTag> list = new List <NamedBinaryTag>(readLen);
for (int i = 0; i < readLen; i++)
{
tagItem = NamedBinaryTag.Create(itemType);
FinishReadValue(tagItem);
list.Add(tagItem);
}
tag.SetList(list);
return(tag);
case TagType.Compound:
Dictionary <string, NamedBinaryTag> compound = new Dictionary <string, NamedBinaryTag>();
while ((tagItem = ReadNextHalf()).Type != TagType.End)
{
FinishReadValue(tagItem);
compound.Add(tagItem.name, tagItem);
}
tag.SetCompound(compound);
return(tag);
case TagType.IntArray:
readLen = ReadInt();
int[] intArray = new int[readLen];
for (int i = 0; i < readLen; i++)
{
intArray[i] = ReadInt();
}
tag.SetIntArray(intArray);
return(tag);
case TagType.LongArray:
readLen = ReadInt();
long[] longArray = new long[readLen];
for (int i = 0; i < readLen; i++)
{
longArray[i] = ReadLong();
}
tag.SetLongArray(longArray);
return(tag);
case TagType.None:
throw new Exception("tag type is None");
default:
throw new Exception("unknown tag type:" + (int)tag.Type);
}
}
//跳过tag的后一半
public NamedBinaryTag SkipValue(NamedBinaryTag tag)
{
if (tag.Type == TagType.None)
{
return(tag);
}
int valueLen = tagValueLengths[(int)tag.Type];
int readLen;
if (valueLen >= 0)
{
_stream.Seek(valueLen, SeekOrigin.Current);
return(tag);
}
TagType type;
switch (tag.Type)
{
case TagType.ByteArray:
readLen = ReadInt();
_stream.Seek(readLen, SeekOrigin.Current);
return(tag);
case TagType.String:
readLen = ReadShort();
_stream.Seek(readLen, SeekOrigin.Current);
return(tag);
case TagType.List:
type = ReadTagType();
NamedBinaryTag skipTag = NamedBinaryTag.Create(type);
int count = ReadInt();
for (int i = 0; i < count; i++)
{
SkipValue(skipTag);
}
return(tag);
case TagType.Compound:
while ((type = ReadTagType()) != TagType.End)
{
skipTag = NamedBinaryTag.Create(type);
readLen = ReadShort();
_stream.Seek(readLen, SeekOrigin.Current);
SkipValue(skipTag);
}
return(tag);
case TagType.IntArray:
readLen = ReadInt();
_stream.Seek(readLen * 4, SeekOrigin.Current);
return(tag);
case TagType.LongArray:
readLen = ReadInt();
_stream.Seek(readLen * 8, SeekOrigin.Current);
return(tag);
default:
throw new Exception("unknown tag type:" + (int)tag.Type);
}
}