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271 lines
11 KiB
C++
271 lines
11 KiB
C++
#include "ba2gnrlfile.hpp"
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#include <cassert>
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#include <filesystem>
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#include <fstream>
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#include <lz4frame.h>
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#include <boost/iostreams/copy.hpp>
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#include <boost/iostreams/filtering_streambuf.hpp>
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#if defined(_MSC_VER)
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#pragma warning(push)
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#pragma warning(disable : 4706)
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#include <boost/iostreams/filter/zlib.hpp>
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#pragma warning(pop)
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#else
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#include <boost/iostreams/filter/zlib.hpp>
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#endif
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#include <boost/iostreams/device/array.hpp>
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#include <components/bsa/memorystream.hpp>
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#include <components/esm/fourcc.hpp>
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#include <components/files/constrainedfilestream.hpp>
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#include <components/files/conversion.hpp>
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#include <components/misc/strings/lower.hpp>
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namespace Bsa
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{
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// special marker for invalid records,
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// equal to max uint32_t value
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const uint32_t sInvalidOffset = std::numeric_limits<uint32_t>::max();
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BA2GNRLFile::FileRecord::FileRecord()
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: size(0)
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, offset(sInvalidOffset)
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{
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}
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bool BA2GNRLFile::FileRecord::isValid() const
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{
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return offset != sInvalidOffset;
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}
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BA2GNRLFile::BA2GNRLFile() {}
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BA2GNRLFile::~BA2GNRLFile() = default;
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void BA2GNRLFile::loadFiles(uint32_t fileCount, std::istream& in)
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{
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mFiles.clear();
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mFiles.reserve(fileCount);
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for (uint32_t i = 0; i < fileCount; ++i)
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{
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uint32_t nameHash, extHash, dirHash;
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in.read(reinterpret_cast<char*>(&nameHash), sizeof(uint32_t));
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in.read(reinterpret_cast<char*>(&extHash), sizeof(uint32_t));
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in.read(reinterpret_cast<char*>(&dirHash), sizeof(uint32_t));
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FileRecord file;
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uint32_t unknown;
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in.read(reinterpret_cast<char*>(&unknown), sizeof(uint32_t));
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in.read(reinterpret_cast<char*>(&file.offset), sizeof(int64_t));
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in.read(reinterpret_cast<char*>(&file.packedSize), sizeof(uint32_t));
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in.read(reinterpret_cast<char*>(&file.size), sizeof(uint32_t));
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uint32_t baadfood;
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in.read(reinterpret_cast<char*>(&baadfood), sizeof(uint32_t));
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if (baadfood != 0xBAADF00D)
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fail("Corrupted BSA");
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mFolders[dirHash][{ nameHash, extHash }] = file;
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FileStruct fileStruct{};
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fileStruct.fileSize = file.size;
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fileStruct.offset = file.offset;
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mFiles.push_back(fileStruct);
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}
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}
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/// Read header information from the input source
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void BA2GNRLFile::readHeader()
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{
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assert(!mIsLoaded);
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std::ifstream input(mFilepath, std::ios_base::binary);
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// Total archive size
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std::streamoff fsize = 0;
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if (input.seekg(0, std::ios_base::end))
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{
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fsize = input.tellg();
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input.seekg(0);
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}
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if (fsize < 24) // header is 24 bytes
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fail("File too small to be a valid BSA archive");
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// Get essential header numbers
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uint32_t type, fileCount;
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uint64_t fileTableOffset;
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{
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uint32_t header[4];
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input.read(reinterpret_cast<char*>(header), 16);
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input.read(reinterpret_cast<char*>(&fileTableOffset), 8);
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if (header[0] == 0x00415342) /*"BSA\x00"*/
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fail("Unrecognized compressed BSA format");
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mVersion = header[1];
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if (mVersion != 0x01 /*F04*/)
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fail("Unrecognized compressed BSA version");
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type = header[2];
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fileCount = header[3];
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}
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if (type == ESM::fourCC("GNRL"))
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loadFiles(fileCount, input);
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else
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fail("Unrecognized ba2 version type");
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// Read the string table
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input.seekg(fileTableOffset);
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for (uint32_t i = 0; i < fileCount; ++i)
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{
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std::vector<char> fileName;
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uint16_t fileNameSize;
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input.read(reinterpret_cast<char*>(&fileNameSize), sizeof(uint16_t));
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fileName.resize(fileNameSize);
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input.read(fileName.data(), fileName.size());
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fileName.push_back('\0');
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mFileNames.push_back(fileName);
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mFiles[i].setNameInfos(0, &mFileNames.back());
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}
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mIsLoaded = true;
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}
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BA2GNRLFile::FileRecord BA2GNRLFile::getFileRecord(const std::string& str) const
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{
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for (const auto c : str)
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{
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if (((static_cast<unsigned>(c) >> 7U) & 1U) != 0U)
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{
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fail("File record " + str + " contains unicode characters, refusing to load.");
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}
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}
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#ifdef _WIN32
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const auto& path = str;
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#else
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// Force-convert the path into something UNIX can handle first
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// to make sure std::filesystem::path doesn't think the entire path is the filename on Linux
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// and subsequently purge it to determine the file folder.
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std::string path = str;
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std::replace(path.begin(), path.end(), '\\', '/');
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#endif
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const auto p = std::filesystem::path{ path }; // Purposefully damage Unicode strings.
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const auto fileName = Misc::StringUtils::lowerCase(p.stem().string());
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const auto ext = Misc::StringUtils::lowerCase(p.extension().string()); // Purposefully damage Unicode strings.
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const auto folder = Misc::StringUtils::lowerCase(p.parent_path().string());
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uint32_t folderHash = generateHash(folder);
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auto it = mFolders.find(folderHash);
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if (it == mFolders.end())
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return FileRecord(); // folder not found, return default which has offset of sInvalidOffset
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uint32_t fileHash = generateHash(fileName);
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uint32_t extHash = *reinterpret_cast<const uint32_t*>(ext.data() + 1);
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auto iter = it->second.find({ fileHash, extHash });
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if (iter == it->second.end())
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return FileRecord(); // file not found, return default which has offset of sInvalidOffset
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return iter->second;
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}
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Files::IStreamPtr BA2GNRLFile::getFile(const FileStruct* file)
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{
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FileRecord fileRec = getFileRecord(file->name());
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if (!fileRec.isValid())
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{
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fail("File not found: " + std::string(file->name()));
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}
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return getFile(fileRec);
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}
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void BA2GNRLFile::addFile(const std::string& filename, std::istream& file)
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{
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assert(false); // not implemented yet
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fail("Add file is not implemented for compressed BSA: " + filename);
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}
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Files::IStreamPtr BA2GNRLFile::getFile(const char* file)
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{
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FileRecord fileRec = getFileRecord(file);
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if (!fileRec.isValid())
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{
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fail("File not found: " + std::string(file));
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}
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return getFile(fileRec);
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}
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Files::IStreamPtr BA2GNRLFile::getFile(const FileRecord& fileRecord)
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{
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Files::IStreamPtr streamPtr
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= Files::openConstrainedFileStream(mFilepath, fileRecord.offset, fileRecord.packedSize);
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std::istream* fileStream = streamPtr.get();
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uint32_t uncompressedSize = fileRecord.size;
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auto memoryStreamPtr = std::make_unique<MemoryInputStream>(uncompressedSize);
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if (fileRecord.packedSize != 0)
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{
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boost::iostreams::filtering_streambuf<boost::iostreams::input> inputStreamBuf;
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inputStreamBuf.push(boost::iostreams::zlib_decompressor());
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inputStreamBuf.push(*fileStream);
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boost::iostreams::basic_array_sink<char> sr(memoryStreamPtr->getRawData(), uncompressedSize);
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boost::iostreams::copy(inputStreamBuf, sr);
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}
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else
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{
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fileStream->read(memoryStreamPtr->getRawData(), fileRecord.size);
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}
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return std::make_unique<Files::StreamWithBuffer<MemoryInputStream>>(std::move(memoryStreamPtr));
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}
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constexpr const uint32_t crc32table[256] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8,
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0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180,
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0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589,
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0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1,
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0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822,
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0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b,
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0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43,
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0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c,
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0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd,
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0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d,
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0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e,
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0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d };
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uint32_t BA2GNRLFile::generateHash(const std::string& name)
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{
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uint32_t result = 0;
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for (auto c : name)
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{
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if (uint8_t(c) > 127)
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continue;
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if (c == '/')
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c = '\\';
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result = (result >> 8) ^ crc32table[(result ^ (unsigned)(c)) & 0xFF];
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}
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return result;
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}
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} // namespace Bsa
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