raze/source/common/filesystem/include/fs_decompress.h
2023-12-17 12:48:03 +01:00

63 lines
1.6 KiB
C++

#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;
}
}
};
}