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-
-// FastNBT.h
-
-// Interfaces to the fast NBT parser and writer
-
-/*
-The fast parser parses the data into a vector of cFastNBTTag structures. These structures describe the NBT tree,
-but themselves are allocated in a vector, thus minimizing reallocation.
-The structures have a minimal constructor, setting all member "pointers" to "invalid".
-
-The fast writer doesn't need a NBT tree structure built beforehand, it is commanded to open, append and close tags
-(just like XML); it keeps the internal tag stack and reports errors in usage.
-It directly outputs a string containing the serialized NBT data.
-*/
-
-
-
-
-
-#pragma once
-
-#include "../Endianness.h"
-
-
-
-
-
-enum eTagType
-{
- TAG_Min = 0, // The minimum value for a tag type
- TAG_End = 0,
- TAG_Byte = 1,
- TAG_Short = 2,
- TAG_Int = 3,
- TAG_Long = 4,
- TAG_Float = 5,
- TAG_Double = 6,
- TAG_ByteArray = 7,
- TAG_String = 8,
- TAG_List = 9,
- TAG_Compound = 10,
- TAG_IntArray = 11,
- TAG_Max = 11, // The maximum value for a tag type
-} ;
-
-
-
-
-
-/** This structure is used for all NBT tags.
-It contains indices to the parent array of tags, building the NBT tree this way.
-Also contains indices into the data stream being parsed, used for values;
-NO dynamically allocated memory is used!
-Structure (all with the tree structure it describes) supports moving in memory (std::vector reallocation)
-*/
-struct cFastNBTTag
-{
-public:
-
- eTagType m_Type;
-
- // The following members are indices into the data stream. m_DataLength == 0 if no data available
- // They must not be pointers, because the datastream may be copied into another AString object in the meantime.
- int m_NameStart;
- int m_NameLength;
- int m_DataStart;
- int m_DataLength;
-
- // The following members are indices into the array returned; -1 if not valid
- // They must not be pointers, because pointers would not survive std::vector reallocation
- int m_Parent;
- int m_PrevSibling;
- int m_NextSibling;
- int m_FirstChild;
- int m_LastChild;
-
- cFastNBTTag(eTagType a_Type, int a_Parent) :
- m_Type(a_Type),
- m_NameLength(0),
- m_DataLength(0),
- m_Parent(a_Parent),
- m_PrevSibling(-1),
- m_NextSibling(-1),
- m_FirstChild(-1),
- m_LastChild(-1)
- {
- }
-
- cFastNBTTag(eTagType a_Type, int a_Parent, int a_PrevSibling) :
- m_Type(a_Type),
- m_NameLength(0),
- m_DataLength(0),
- m_Parent(a_Parent),
- m_PrevSibling(a_PrevSibling),
- m_NextSibling(-1),
- m_FirstChild(-1),
- m_LastChild(-1)
- {
- }
-} ;
-
-
-
-
-
-/** Parses and contains the parsed data
-Also implements data accessor functions for tree traversal and value getters
-The data pointer passed in the constructor is assumed to be valid throughout the object's life. Care must be taken not to initialize from a temporary.
-*/
-class cParsedNBT
-{
-public:
- cParsedNBT(const char * a_Data, int a_Length);
-
- bool IsValid(void) const {return m_IsValid; }
-
- int GetRoot(void) const {return 0; }
- int GetFirstChild (int a_Tag) const { return m_Tags[a_Tag].m_FirstChild; }
- int GetLastChild (int a_Tag) const { return m_Tags[a_Tag].m_LastChild; }
- int GetNextSibling(int a_Tag) const { return m_Tags[a_Tag].m_NextSibling; }
- int GetPrevSibling(int a_Tag) const { return m_Tags[a_Tag].m_PrevSibling; }
- int GetDataLength (int a_Tag) const { return m_Tags[a_Tag].m_DataLength; }
-
- const char * GetData(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type != TAG_List);
- ASSERT(m_Tags[a_Tag].m_Type != TAG_Compound);
- return m_Data + m_Tags[a_Tag].m_DataStart;
- }
-
- int FindChildByName(int a_Tag, const AString & a_Name) const
- {
- return FindChildByName(a_Tag, a_Name.c_str(), a_Name.length());
- }
-
- int FindChildByName(int a_Tag, const char * a_Name, size_t a_NameLength = 0) const;
- int FindTagByPath (int a_Tag, const AString & a_Path) const;
-
- eTagType GetType(int a_Tag) const { return m_Tags[a_Tag].m_Type; }
-
- /// Returns the children type for a list tag; undefined on other tags. If list empty, returns TAG_End
- eTagType GetChildrenType(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type == TAG_List);
- return (m_Tags[a_Tag].m_FirstChild < 0) ? TAG_End : m_Tags[m_Tags[a_Tag].m_FirstChild].m_Type;
- }
-
- inline unsigned char GetByte(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type == TAG_Byte);
- return (unsigned char)(m_Data[m_Tags[a_Tag].m_DataStart]);
- }
-
- inline Int16 GetShort(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type == TAG_Short);
- return ntohs(*((Int16 *)(m_Data + m_Tags[a_Tag].m_DataStart)));
- }
-
- inline Int32 GetInt(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type == TAG_Int);
- return ntohl(*((Int32 *)(m_Data + m_Tags[a_Tag].m_DataStart)));
- }
-
- inline Int64 GetLong(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type == TAG_Long);
- return NetworkToHostLong8(m_Data + m_Tags[a_Tag].m_DataStart);
- }
-
- inline float GetFloat(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type == TAG_Float);
- Int32 tmp = ntohl(*((Int32 *)(m_Data + m_Tags[a_Tag].m_DataStart)));
- return *((float *)&tmp);
- }
-
- inline double GetDouble(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type == TAG_Double);
- return NetworkToHostDouble8(m_Data + m_Tags[a_Tag].m_DataStart);
- }
-
- inline AString GetString(int a_Tag) const
- {
- ASSERT(m_Tags[a_Tag].m_Type == TAG_String);
- AString res;
- res.assign(m_Data + m_Tags[a_Tag].m_DataStart, m_Tags[a_Tag].m_DataLength);
- return res;
- }
-
- inline AString GetName(int a_Tag) const
- {
- AString res;
- res.assign(m_Data + m_Tags[a_Tag].m_NameStart, m_Tags[a_Tag].m_NameLength);
- return res;
- }
-
-protected:
- const char * m_Data;
- int m_Length;
- std::vector<cFastNBTTag> m_Tags;
- bool m_IsValid; // True if parsing succeeded
-
- // Used while parsing:
- int m_Pos;
-
- bool Parse(void);
- bool ReadString(int & a_StringStart, int & a_StringLen); // Reads a simple string (2 bytes length + data), sets the string descriptors
- bool ReadCompound(void); // Reads the latest tag as a compound
- bool ReadList(eTagType a_ChildrenType); // Reads the latest tag as a list of items of type a_ChildrenType
- bool ReadTag(void); // Reads the latest tag, depending on its m_Type setting
-} ;
-
-
-
-
-
-class cFastNBTWriter
-{
-public:
- cFastNBTWriter(const AString & a_RootTagName = "");
-
- void BeginCompound(const AString & a_Name);
- void EndCompound(void);
-
- void BeginList(const AString & a_Name, eTagType a_ChildrenType);
- void EndList(void);
-
- void AddByte (const AString & a_Name, unsigned char a_Value);
- void AddShort (const AString & a_Name, Int16 a_Value);
- void AddInt (const AString & a_Name, Int32 a_Value);
- void AddLong (const AString & a_Name, Int64 a_Value);
- void AddFloat (const AString & a_Name, float a_Value);
- void AddDouble (const AString & a_Name, double a_Value);
- void AddString (const AString & a_Name, const AString & a_Value);
- void AddByteArray(const AString & a_Name, const char * a_Value, size_t a_NumElements);
- void AddIntArray (const AString & a_Name, const int * a_Value, size_t a_NumElements);
-
- void AddByteArray(const AString & a_Name, const AString & a_Value)
- {
- AddByteArray(a_Name, a_Value.data(), a_Value.size());
- }
-
- const AString & GetResult(void) const {return m_Result; }
-
- void Finish(void);
-
-protected:
-
- struct sParent
- {
- int m_Type; // TAG_Compound or TAG_List
- int m_Pos; // for TAG_List, the position of the list count
- int m_Count; // for TAG_List, the element count
- eTagType m_ItemType; // for TAG_List, the element type
- } ;
-
- static const int MAX_STACK = 50; // Highliy doubtful that an NBT would be constructed this many levels deep
-
- // These two fields emulate a stack. A raw array is used due to speed issues - no reallocations are allowed.
- sParent m_Stack[MAX_STACK];
- int m_CurrentStack;
-
- AString m_Result;
-
- bool IsStackTopCompound(void) const { return (m_Stack[m_CurrentStack].m_Type == TAG_Compound); }
-
- void WriteString(const char * a_Data, short a_Length);
-
- inline void TagCommon(const AString & a_Name, eTagType a_Type)
- {
- // If we're directly inside a list, check that the list is of the correct type:
- ASSERT((m_Stack[m_CurrentStack].m_Type != TAG_List) || (m_Stack[m_CurrentStack].m_ItemType == a_Type));
-
- if (IsStackTopCompound())
- {
- // Compound: add the type and name:
- m_Result.push_back((char)a_Type);
- WriteString(a_Name.c_str(), (short)a_Name.length());
- }
- else
- {
- // List: add to the counter
- m_Stack[m_CurrentStack].m_Count++;
- }
- }
-} ;
-
-
-
-