From 69a4ee53830121714927c37e4f0b9a357cd03957 Mon Sep 17 00:00:00 2001
From: "madmaxoft@gmail.com"
 <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>
Date: Wed, 7 Mar 2012 11:28:24 +0000
Subject: Added the Anvil level format (MCA) support, read-only for the time
 being. Now MCS can read your worlds from the official server :)

git-svn-id: http://mc-server.googlecode.com/svn/trunk@380 0a769ca7-a7f5-676a-18bf-c427514a06d6
---
 source/NBT.cpp | 620 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 620 insertions(+)
 create mode 100644 source/NBT.cpp

(limited to 'source/NBT.cpp')

diff --git a/source/NBT.cpp b/source/NBT.cpp
new file mode 100644
index 000000000..c48124cb3
--- /dev/null
+++ b/source/NBT.cpp
@@ -0,0 +1,620 @@
+
+// NBT.cpp
+
+// Implements the classes used for NBT representation, parsing and serializing
+
+/*
+This file has been retrofitted from a different project of mine (_Xoft(o)) and melded here, so it is not strictyl MCS-styled
+Also the project used error codes, which MCS doesn't need, so they were declared locally only.
+The code is not strictly safe, it could leak pointers when exceptions are thrown. It could use a RAII redesign.
+*/
+
+#include "Globals.h"
+#include "NBT.h"
+#include "Endianness.h"
+
+
+
+
+
+// Error codes
+// Unused by MCS
+enum
+{
+	ERROR_PRIVATE_BASE = 0x00040000,
+	
+	ERROR_PRIVATE_NBTPARSER_BADTYPE,         // The parsed type is not recognized
+	ERROR_PRIVATE_NBTPARSER_INVALIDLENGTH,   // The parsed name has an invalid length (negative-length string etc.)
+	ERROR_PRIVATE_NBTPARSER_UNEXPECTEDTAG,   // The parser has encountered a tag that should not be at such a point
+	ERROR_PRIVATE_NBTPARSER_TOOSHORT,        // The parser was invoked on data that is too short
+	
+	ERROR_PRIVATE_NBT_UNINITIALIZEDLIST,     // NBTList needs its ChildType set before adding items to it
+	ERROR_PRIVATE_NBT_TYPEMISMATCH,          // NBTList must have all of its children of the same type
+	ERROR_PRIVATE_NBT_UNEXPECTEDTAG,         // NBTList and NBTCompound cannot contain a TAG_End
+	ERROR_PRIVATE_NBT_BADTYPE,               // NBTList's children type cannot be set to such a value
+	ERROR_PRIVATE_NBT_LISTNOTEMPTY,          // NBTList must be empty to allow setting children type
+	ERROR_PRIVATE_NBT_INDEXOUTOFRANGE,       // Requesting an item with invalid index from a list or a compound
+
+	ERROR_PRIVATE_UNKNOWN,                   // Unknown error
+} ;
+
+#ifndef ERROR_SUCCESS
+	// This constant is actually #defined in the WinAPI; it cannot be put into the above enum, but needs to be #defined (for *nix)
+	#define ERROR_SUCCESS 0
+#endif  // ERROR_SUCCCESS
+
+#ifndef ERROR_NOT_ENOUGH_MEMORY
+	// This constant is actually #defined in the WinAPI; it cannot be put into the above enum, but needs to be #defined (for *nix)
+	#define ERROR_NOT_ENOUGH_MEMORY 8
+#endif  // ERROR_NOT_ENOUGH_MEMORY
+
+
+
+
+
+#define RETURN_INT_IF_FAILED(X) {int r = X; if (r != ERROR_SUCCESS) return r; }
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cNBTTag:
+
+cNBTTag * cNBTTag::CreateTag(cNBTTag * a_Parent, eTagType a_Type, const AString & a_Name)
+{
+	// Creates a new instance of a tag specified by a_Type, uses the correct class
+	switch (a_Type)
+	{
+		case TAG_Byte:      return new cNBTByte     (a_Parent, a_Name);
+		case TAG_Short:     return new cNBTShort    (a_Parent, a_Name);
+		case TAG_Int:       return new cNBTInt      (a_Parent, a_Name);
+		case TAG_Long:      return new cNBTLong     (a_Parent, a_Name);
+		case TAG_Float:     return new cNBTFloat    (a_Parent, a_Name);
+		case TAG_Double:    return new cNBTDouble   (a_Parent, a_Name);
+		case TAG_ByteArray: return new cNBTByteArray(a_Parent, a_Name);
+		case TAG_String:    return new cNBTString   (a_Parent, a_Name);
+		case TAG_List:      return new cNBTList     (a_Parent, a_Name);
+		case TAG_Compound:  return new cNBTCompound (a_Parent, a_Name);
+		default:
+		{
+			ASSERT("Unknown TAG type requested" == NULL);
+			return NULL;
+		}
+	}
+}
+
+
+
+
+
+cNBTTag * cNBTTag::FindChildByPath(const AString & iPath)
+{
+	size_t PrevIdx = 0;
+	size_t idx = iPath.find('\\');
+	cNBTTag * res = this;
+	while ((res != NULL) && (idx != AString::npos))
+	{
+		res = res->FindChildByName(AString(iPath, PrevIdx, idx - PrevIdx));
+		PrevIdx = idx + 1;
+		idx = iPath.find('\\', PrevIdx);
+	}
+	if (res != NULL)
+	{
+		res = res->FindChildByName(AString(iPath, PrevIdx));
+	}
+	return res;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cNBTList:
+
+void cNBTList::Clear(void)
+{
+	for (cNBTTags::iterator itr = m_Children.begin(); itr != m_Children.end(); ++itr)
+	{
+		delete *itr;
+	}
+	m_Children.clear();
+}
+
+
+
+
+int cNBTList::Add(cNBTTag * iTag)
+{
+	// Catch usage errors while debugging:
+	ASSERT(m_ChildrenType != TAG_End);
+	ASSERT(iTag->GetType() == m_ChildrenType);
+	
+	// Catch errors while running:
+	if (m_ChildrenType == TAG_End)
+	{
+		return ERROR_PRIVATE_NBT_UNINITIALIZEDLIST;
+	}
+	if (iTag->GetType() != m_ChildrenType)
+	{
+		return ERROR_PRIVATE_NBT_TYPEMISMATCH;
+	}
+	
+	m_Children.push_back(iTag);
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTList::SetChildrenType(cNBTTag::eTagType a_Type)
+{
+	// Catch usage errors while debugging:
+	ASSERT(a_Type != TAG_End);  // Invalid, though not specifically in the NBT spec
+	ASSERT(m_Children.size() == 0);  // Can change only when empty
+	
+	// Catch runtime errors:
+	if (a_Type == TAG_End)
+	{
+		return ERROR_PRIVATE_NBT_BADTYPE;
+	}
+	if (m_Children.size() != 0)
+	{
+		return ERROR_PRIVATE_NBT_LISTNOTEMPTY;
+	}
+	
+	m_ChildrenType = a_Type;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+cNBTTag * cNBTList::GetChildByIdx(size_t iIndex)
+{
+	// Catch usage errors while debugging:
+	ASSERT((iIndex >= 0) && (iIndex < m_Children.size()));
+	
+	// Catch runtime errors:
+	if ((iIndex < 0) || (iIndex >= m_Children.size()))
+	{
+		return NULL;
+	}
+	
+	return m_Children[iIndex];
+}
+
+
+
+
+
+cNBTTag * cNBTList::FindChildByName(const AString & a_Name)
+{
+	for (cNBTTags::iterator itr = m_Children.begin(); itr != m_Children.end(); ++itr)
+	{
+		if ((*itr)->GetName() == a_Name)
+		{
+			return *itr;
+		}
+	}
+	return NULL;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cNBTCompound:
+
+void cNBTCompound::Clear(void)
+{
+	for (cNBTTags::iterator itr = m_Children.begin(); itr != m_Children.end(); ++itr)
+	{
+		delete *itr;
+	}
+	m_Children.clear();
+}
+
+
+
+
+
+int cNBTCompound::Add(cNBTTag * iTag)
+{
+	// Catch usage errors while debugging:
+	ASSERT(iTag->GetType() != TAG_End);
+	
+	// Catch runtime errors:
+	if (iTag->GetType() == TAG_End)
+	{
+		return ERROR_PRIVATE_NBT_UNEXPECTEDTAG;
+	}
+	
+	m_Children.push_back(iTag);
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+cNBTTag * cNBTCompound::GetChildByIdx(size_t iIndex)
+{
+	// Catch usage errors while debugging:
+	ASSERT((iIndex >= 0) && (iIndex < m_Children.size()));
+	
+	// Catch runtime errors:
+	if ((iIndex < 0) || (iIndex >= m_Children.size()))
+	{
+		return NULL;
+	}
+	
+	return m_Children[iIndex];
+}
+
+
+
+
+
+cNBTTag * cNBTCompound::FindChildByName(const AString & a_Name)
+{
+	for (cNBTTags::iterator itr = m_Children.begin(); itr != m_Children.end(); ++itr)
+	{
+		if ((*itr)->GetName() == a_Name)
+		{
+			return *itr;
+		}
+	}
+	return NULL;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cNBTParser:
+
+int cNBTParser::ReadByte(const char ** a_Data, int * a_Length, char & a_Value)
+{
+	if (*a_Length < 1)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	a_Value = **a_Data;
+	*a_Data += 1;
+	*a_Length -= 1;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadInt16(const char ** a_Data, int * a_Length, Int16 & a_Value)
+{
+	if (*a_Length < 2)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	a_Value = ntohs(*((Int16 *)*a_Data));
+	*a_Data += 2;
+	*a_Length -= 2;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadInt32(const char ** a_Data, int * a_Length, Int32 & a_Value)
+{
+	if (*a_Length < 4)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	a_Value = ntohl(*((Int32 *)*a_Data));
+	*a_Data += 4;
+	*a_Length -= 4;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadInt64(const char ** a_Data, int * a_Length, Int64 & a_Value)
+{
+	if (*a_Length < 8)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	a_Value = NetworkToHostLong8(*a_Data);
+	*a_Data += 8;
+	*a_Length -= 8;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadFloat(const char ** a_Data, int * a_Length, float & a_Value)
+{
+	if (*a_Length < 4)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	// Read as a 32-bit integer, converting endianness, then reinterpret as float:
+	Int32 tmp = ntohl(*((Int32 *)*a_Data));
+	a_Value = *((float *)&tmp);
+	*a_Data += 4;
+	*a_Length -= 4;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadDouble(const char ** a_Data, int * a_Length, double & a_Value)
+{
+	if (*a_Length < 8)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	a_Value = NetworkToHostDouble8(a_Data);
+	*a_Data += 8;
+	*a_Length -= 8;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadByteArray(const char ** a_Data, int * a_Length, AString & a_String)
+{
+	// Reads the short-counted string, adjusts a_Data and a_Length accordingly
+	Int32 Len;
+	RETURN_INT_IF_FAILED(ReadInt32(a_Data, a_Length, Len));
+	if (Len < 0)
+	{
+		return ERROR_PRIVATE_NBTPARSER_INVALIDLENGTH;
+	}
+	if (*a_Length < Len)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	a_String.assign(*a_Data, Len);
+	*a_Data += Len;
+	*a_Length -= Len;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadString(const char ** a_Data, int * a_Length, AString & a_String)
+{
+	// Reads the short-counted string, adjusts a_Data and a_Length accordingly
+	if (*a_Length < 2)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	Int16 val = *((Int16 *)*a_Data);
+	Int16 Len = ntohs(val);
+	if (Len < 0)
+	{
+		return ERROR_PRIVATE_NBTPARSER_INVALIDLENGTH;
+	}
+	*a_Data += 2;
+	*a_Length -= 2;
+	if (*a_Length < Len)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	a_String.assign(*a_Data, Len);
+	*a_Data += Len;
+	*a_Length -= Len;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadList(const char ** a_Data, int * a_Length, cNBTList * a_List)
+{
+	// Reads a_List's     contents from a_Data; up to a_Length bytes may be used; adjusts a_Data and a_Length for after the list
+	Int32 ItemCount;
+	RETURN_INT_IF_FAILED(ReadInt32(a_Data, a_Length, ItemCount));
+	for (Int32 i = 0; i < ItemCount; i++)
+	{
+		cNBTTag * child = NULL;
+		RETURN_INT_IF_FAILED(ReadTag(a_Data, a_Length, a_List->GetChildrenType(), "", a_List, &child));
+		if (child == NULL)
+		{
+			return ERROR_PRIVATE_UNKNOWN;
+		}
+		RETURN_INT_IF_FAILED(a_List->Add(child));
+	}  // for i - Items[]
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+int cNBTParser::ReadCompound(const char ** a_Data, int * a_Length, cNBTCompound * a_Compound)
+{
+	// Reads a_Compound's contents from a_Data; up to a_Length bytes may be used; adjusts a_Data and a_Length for after the compound
+	while (true)
+	{
+		char TagType = **a_Data;
+		*a_Data += 1;
+		*a_Length -= 1;
+		if (TagType == cNBTTag::TAG_End)
+		{
+			return ERROR_SUCCESS;
+		}
+		AString Name;
+		RETURN_INT_IF_FAILED(ReadString(a_Data, a_Length, Name));
+		cNBTTag * child = NULL;
+		RETURN_INT_IF_FAILED(ReadTag(a_Data, a_Length, (cNBTTag::eTagType)TagType, Name, a_Compound, &child));
+		if (child == NULL)
+		{
+			return ERROR_PRIVATE_UNKNOWN;
+		}
+		RETURN_INT_IF_FAILED(a_Compound->Add(child));
+	}  // while (true)
+}
+
+
+
+
+int cNBTParser::ReadIntArray(const char ** a_Data, int * a_Length, cNBTIntArray * a_Array)
+{
+	if (*a_Length < 4)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	int Count = ntohl(*((int *)*a_Data));
+	*a_Data += 4;
+	*a_Length -= 4;
+	if (*a_Length < 4 * Count)
+	{
+		return ERROR_PRIVATE_NBTPARSER_TOOSHORT;
+	}
+	for (int i = 0; i < Count; i++)
+	{
+		int Value = ntohl(*((int *)*a_Data));
+		a_Array->Add(Value);
+		*a_Data += 4;
+	}
+	*a_Length -= 4 * Count;
+	return ERROR_SUCCESS;
+}
+
+
+
+
+
+#define CASE_SIMPLE_TAG(TAGTYPE,CTYPE,FUNC) \
+	case cNBTTag::TAG_##TAGTYPE: \
+	{ \
+		CTYPE val; \
+		RETURN_INT_IF_FAILED(Read##FUNC(a_Data, a_Length, val)); \
+		*a_Tag = new cNBT##TAGTYPE(a_Parent, a_Name, val); \
+		if (*a_Tag == NULL) \
+		{ \
+			return ERROR_NOT_ENOUGH_MEMORY; \
+		} \
+		return ERROR_SUCCESS;\
+	}
+	
+int cNBTParser::ReadTag(const char ** a_Data, int * a_Length, cNBTTag::eTagType a_Type, const AString & a_Name, cNBTTag * a_Parent, cNBTTag ** a_Tag)
+{
+	switch (a_Type)
+	{
+		CASE_SIMPLE_TAG(Byte,      char,    Byte)
+		CASE_SIMPLE_TAG(Short,     Int16,   Int16)
+		CASE_SIMPLE_TAG(Int,       Int32,   Int32)
+		CASE_SIMPLE_TAG(Long,      Int64,   Int64)
+		CASE_SIMPLE_TAG(Float,     float,   Float)
+		CASE_SIMPLE_TAG(Double,    double,  Double)
+		CASE_SIMPLE_TAG(ByteArray, AString, ByteArray)
+		CASE_SIMPLE_TAG(String,    AString, String)
+		
+		case cNBTTag::TAG_List:
+		{
+			char ItemType;
+			RETURN_INT_IF_FAILED(ReadByte (a_Data, a_Length, ItemType));
+			cNBTList * List = new cNBTList(a_Parent, a_Name);
+			if (List == NULL)
+			{
+				return ERROR_NOT_ENOUGH_MEMORY;
+			}
+			RETURN_INT_IF_FAILED(List->SetChildrenType((cNBTTag::eTagType)ItemType));
+			RETURN_INT_IF_FAILED(ReadList(a_Data, a_Length, List));
+			*a_Tag = List;
+			return ERROR_SUCCESS;
+		}
+		
+		case cNBTTag::TAG_Compound:
+		{
+			cNBTCompound * Compound = new cNBTCompound(a_Parent, a_Name);
+			if (Compound == NULL)
+			{
+				return ERROR_NOT_ENOUGH_MEMORY;
+			}
+			RETURN_INT_IF_FAILED(ReadCompound(a_Data, a_Length, Compound));
+			*a_Tag = Compound;
+			return ERROR_SUCCESS;
+		}
+		
+		case cNBTTag::TAG_IntArray:
+		{
+			cNBTIntArray * Array = new cNBTIntArray(a_Parent, a_Name);
+			if (Array == NULL)
+			{
+				return ERROR_NOT_ENOUGH_MEMORY;
+			}
+			RETURN_INT_IF_FAILED(ReadIntArray(a_Data, a_Length, Array));
+			*a_Tag = Array;
+			return ERROR_SUCCESS;
+		}
+		
+		default:
+		{
+			ASSERT(!"Unhandled NBT tag type");
+			break;
+		}
+	}  // switch (iType)
+
+	return ERROR_PRIVATE_NBTPARSER_BADTYPE;
+}
+
+
+
+
+
+cNBTTree * cNBTParser::Parse(const char * a_Data, int a_Length)
+{
+	// Creates a NBT from a_Data
+	if (a_Length < 3)
+	{
+		return NULL;
+	}
+	if (a_Data[0] != cNBTTag::TAG_Compound)
+	{
+		return NULL;
+	}
+	a_Data++;
+	a_Length--;
+	AString Name;
+	if (ReadString(&a_Data, &a_Length, Name) != 0)
+	{
+		return NULL;
+	}
+	std::auto_ptr<cNBTCompound> Root(new cNBTCompound(NULL, Name));
+	if (Root.get() == NULL)
+	{
+		return NULL;
+	}
+	if (ReadCompound(&a_Data, &a_Length, Root.get()) == 0)
+	{
+		return Root.release();
+	}
+	return NULL;
+}
+
+
+
+
+
-- 
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