gzdoom-gles/src/resourcefiles/resourcefile.h

#ifndef __RESFILE_H
#define __RESFILE_H

#include "files.h"

class FResourceFile;
class FTexture;

// This holds a compresed Zip entry with all needed info to decompress it.
struct FCompressedBuffer
{
	unsigned mSize;
	unsigned mCompressedSize;
	int mMethod;
	int mZipFlags;
	unsigned mCRC32;
	char *mBuffer;

	bool Decompress(char *destbuffer);
	void Clean()
	{
		mSize = mCompressedSize = 0;
		if (mBuffer != nullptr)
		{
			delete[] mBuffer;
			mBuffer = nullptr;
		}
	}
};

struct FResourceLump
{
	friend class FResourceFile;

	int				LumpSize;
	FString			FullName;		// only valid for files loaded from a non-wad archive
	union
	{
		char		Name[9];

		uint32_t		dwName;			// These are for accessing the first 4 or 8 chars of
		uint64_t		qwName;			// Name as a unit without breaking strict aliasing rules
	};
	uint8_t			Flags;
	int8_t			RefCount;
	char *			Cache;
	FResourceFile *	Owner;
	FTexture *		LinkedTexture;
	int				Namespace;

	FResourceLump()
	{
		Cache = NULL;
		Owner = NULL;
		Flags = 0;
		RefCount = 0;
		Namespace = 0;	// ns_global
		*Name = 0;
		LinkedTexture = NULL;
	}

	virtual ~FResourceLump();
	virtual FileReader *GetReader();
	virtual FileReader *NewReader();
	virtual int GetFileOffset() { return -1; }
	virtual int GetIndexNum() const { return 0; }
	void LumpNameSetup(FString iname);
	void CheckEmbedded();
	virtual FCompressedBuffer GetRawData();

	void *CacheLump();
	int ReleaseCache();

protected:
	virtual int FillCache() = 0;

};

class FResourceFile
{
public:
	FileReader *Reader;
	const char *Filename;
protected:
	uint32_t NumLumps;

	FResourceFile(const char *filename, FileReader *r);

	// for archives that can contain directories
	void PostProcessArchive(void *lumps, size_t lumpsize);

private:
	uint32_t FirstLump;

	int FilterLumps(FString filtername, void *lumps, size_t lumpsize, uint32_t max);
	int FilterLumpsByGameType(int gametype, void *lumps, size_t lumpsize, uint32_t max);
	bool FindPrefixRange(FString filter, void *lumps, size_t lumpsize, uint32_t max, uint32_t &start, uint32_t &end);
	void JunkLeftoverFilters(void *lumps, size_t lumpsize, uint32_t max);

public:
	static FResourceFile *OpenResourceFile(const char *filename, FileReader *file, bool quiet = false, bool containeronly = false);
	static FResourceFile *OpenDirectory(const char *filename, bool quiet = false);
	virtual ~FResourceFile();
	FileReader *GetReader() const { return Reader; }
	uint32_t LumpCount() const { return NumLumps; }
	uint32_t GetFirstLump() const { return FirstLump; }
	void SetFirstLump(uint32_t f) { FirstLump = f; }

	virtual void FindStrifeTeaserVoices ();
	virtual bool Open(bool quiet) = 0;
	virtual FResourceLump *GetLump(int no) = 0;
	FResourceLump *FindLump(const char *name);
};

struct FUncompressedLump : public FResourceLump
{
	int				Position;

	virtual FileReader *GetReader();
	virtual int FillCache();
	virtual int GetFileOffset() { return Position; }

};


// Base class for uncompressed resource files (WAD, GRP, PAK and single lumps)
class FUncompressedFile : public FResourceFile
{
protected:
	FUncompressedLump * Lumps;


	FUncompressedFile(const char *filename, FileReader *r);
	virtual ~FUncompressedFile();
	virtual FResourceLump *GetLump(int no) { return ((unsigned)no < NumLumps)? &Lumps[no] : NULL; }

public:
};


struct FExternalLump : public FResourceLump
{
	const char *filename;	// the actual file name. This is not necessarily the same as the lump name!

	FExternalLump(const char *_filename, int filesize = -1);
	~FExternalLump();
	virtual int FillCache();

};

struct FMemoryFile : public FUncompressedFile
{
	MemoryArrayReader mr;

	FMemoryFile(const char *_filename, const void *sdata, int length)
		: FUncompressedFile(_filename, nullptr), mr((const char *)sdata, length)
	{
		Reader = &mr;
	}

	bool Open(bool quiet)
	{
		FString name(ExtractFileBase(Filename));
		FString fname(ExtractFileBase(Filename, true));

		Lumps = new FUncompressedLump[1];	// must use array allocator
		uppercopy(Lumps->Name, name);
		Lumps->Name[8] = 0;
		Lumps->FullName = fname;
		Lumps->Owner = this;
		Lumps->Position = 0;
		Lumps->LumpSize = Reader->GetLength();
		Lumps->Namespace = ns_global;
		Lumps->Flags = 0;
		Lumps->FullName = NULL;
		NumLumps = 1;
		return true;
	}


};




#endif