#pragma once
#include "fs_files.h"

namespace FileSys {

// Zip compression methods, extended by some internal types to be passed to OpenDecompressor
enum ECompressionMethod
{
	METHOD_STORED = 0,
	METHOD_SHRINK = 1,
	METHOD_IMPLODE = 6,
	METHOD_DEFLATE = 8,
	METHOD_BZIP2 = 12,
	METHOD_LZMA = 14,
	METHOD_XZ = 95,
	METHOD_PPMD = 98,
	METHOD_LZSS = 1337,			// not used in Zips - this is for Console Doom compression
	METHOD_ZLIB = 1338,			// Zlib stream with header, used by compressed nodes.
	METHOD_RFFCRYPT = 1339,		// not actual compression but can be put in here to make handling easier.
	METHOD_IMPLODE_MIN = 1000, // having discrete types for these avoids keeping around the GPFlags word in Zips.
	METHOD_IMPLODE_0 = 1000,
	METHOD_IMPLODE_2 = 1002,
	METHOD_IMPLODE_4 = 1004,
	METHOD_IMPLODE_6 = 1006,
	METHOD_IMPLODE_MAX = 1006,
	METHOD_INVALID = 0x7fff,
	METHOD_TRANSFEROWNER = 0x8000,
};

enum EDecompressFlags
{
	DCF_TRANSFEROWNER = 1,
	DCF_SEEKABLE = 2,
	DCF_EXCEPTIONS = 4,
	DCF_CACHED = 8,
};

bool OpenDecompressor(FileReader& self, FileReader &parent, FileReader::Size length, int method, int flags = 0);	// creates a decompressor stream. 'seekable' uses a buffered version so that the Seek and Tell methods can be used.

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

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


}