enderalse/source/fs.dll/common/IArchive.h

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2021-10-06 00:45:46 +00:00
#pragma once
#include "common/IDataStream.h"
#include "common/IDynamicCreate.h"
#if ENABLE_IDYNAMICCREATE
/**
* An object archive
*
* This class implements reading and instantiating objects from an object archive.
*/
class IArchive
{
public:
class iterator;
friend iterator;
IArchive();
IArchive(IDataStream * inStream);
~IArchive();
void AttachStream(IDataStream * inStream);
void Dispose(void);
iterator begin(void) { return iterator(0, this); }
iterator end(void) { return iterator(header.numEntries, this); }
static const UInt32 kFileID = CHAR_CODE(0x00, 'A', 'R', 0x01);
static const UInt32 kCurrentVersion = VERSION_CODE(1, 0, 0);
private:
struct FileHeader
{
UInt32 fileID; // IArchive::kFileID
UInt32 version; // IArchive::kCurrentVersion
UInt32 numEntries;
UInt32 nameTableOffset;
UInt32 nameTableLength;
};
struct HeaderEntry
{
UInt32 typeID;
UInt32 subID;
UInt32 dataOffset;
UInt32 dataLength;
UInt32 nameOffset;
};
void ReadHeader(void);
IDataStream * theStream;
FileHeader header;
HeaderEntry * entries;
char * nameTable;
public:
class iterator
{
public:
iterator() { idx = 0; owner = NULL; }
iterator(UInt32 inIdx, IArchive * inArchive) { idx = inIdx; owner = inArchive; }
~iterator() { }
IDynamic * Instantiate(void);
UInt32 GetTypeID(void) { return GetData()->typeID; }
UInt32 GetSubID(void) { return GetData()->subID; }
UInt32 GetDataLength(void) { return GetData()->dataLength; }
char * GetName(void) { return &owner->nameTable[GetData()->nameOffset]; }
void * GetBuffer(UInt32 * outLength);
iterator & operator++() { Next(); return *this; }
iterator & operator--() { Prev(); return *this; }
void NextOfType(UInt32 typeID);
void Next(void) { idx++; }
void PrevOfType(UInt32 typeID);
void Prev(void) { idx--; }
private:
HeaderEntry * GetData(void) { return &owner->entries[idx]; }
UInt32 GetDataOffset(void) { return GetData()->dataOffset; }
UInt32 idx;
IArchive * owner;
};
};
#endif