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101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
/*
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OpenMW - The completely unofficial reimplementation of Morrowind
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Copyright (C) 2008-2010 Nicolay Korslund
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Email: < korslund@gmail.com >
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WWW: http://openmw.sourceforge.net/
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This file (compressedbsafile.hpp) is part of the OpenMW package.
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OpenMW is distributed as free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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version 3, as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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version 3 along with this program. If not, see
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http://www.gnu.org/licenses/ .
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Compressed BSA stuff added by cc9cii 2018
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*/
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#ifndef BSA_COMPRESSED_BSA_FILE_H
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#define BSA_COMPRESSED_BSA_FILE_H
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#include <components/bsa/bsa_file.hpp>
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namespace Bsa
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{
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enum BsaVersion
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{
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BSAVER_UNKNOWN = 0x0,
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BSAVER_UNCOMPRESSED = 0x100,
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BSAVER_COMPRESSED = 0x415342 //B, S, A
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};
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class CompressedBSAFile : public BSAFile
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{
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private:
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//special marker for invalid records,
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//equal to max uint32_t value
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static const uint32_t sInvalidOffset;
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//bit marking compression on file size
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static const uint32_t sCompressedFlag;
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struct FileRecord
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{
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std::uint32_t size;
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std::uint32_t offset;
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FileRecord();
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bool isCompressed(bool bsaCompressedByDefault) const;
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bool isValid() const;
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std::uint32_t getSizeWithoutCompressionFlag() const;
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};
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//if files in BSA without 30th bit enabled are compressed
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bool mCompressedByDefault;
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//if each file record begins with BZ string with file name
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bool mEmbeddedFileNames;
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std::uint32_t mVersion{0u};
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struct FolderRecord
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{
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std::uint32_t count;
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std::uint64_t offset;
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std::map<std::uint64_t, FileRecord> files;
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};
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std::map<std::uint64_t, FolderRecord> mFolders;
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FileRecord getFileRecord(const std::string& str) const;
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void getBZString(std::string& str, std::istream& filestream);
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//mFiles used by OpenMW will contain uncompressed file sizes
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void convertCompressedSizesToUncompressed();
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/// \brief Normalizes given filename or folder and generates format-compatible hash. See https://en.uesp.net/wiki/Tes4Mod:Hash_Calculation.
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static std::uint64_t generateHash(std::string stem, std::string extension) ;
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Files::IStreamPtr getFile(const FileRecord& fileRecord);
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public:
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CompressedBSAFile();
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virtual ~CompressedBSAFile();
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//checks version of BSA from file header
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static BsaVersion detectVersion(std::string filePath);
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/// Read header information from the input source
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void readHeader() override;
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Files::IStreamPtr getFile(const char* filePath) override;
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Files::IStreamPtr getFile(const FileStruct* fileStruct) override;
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};
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}
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#endif
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