SDAT.cpp

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// ReSharper disable CppRedundantQualifier
 
#include <vpkpp/format/SDAT.h>
 
#include <filesystem>
 
#include <FileStream.h>
 
using namespace sourcepp;
using namespace vpkpp;
 
std::unique_ptr<PackFile> SDAT::create(const std::string& path) {
    {
        FileStream stream{path, FileStream::OPT_TRUNCATE | FileStream::OPT_CREATE_IF_NONEXISTENT};
        stream
            .write(SDAT_SIGNATURE)
            .write<uint32_t>(0)
            .write<uint32_t>(0);
    }
    return SDAT::open(path);
}
 
std::unique_ptr<PackFile> SDAT::open(const std::string& path, const EntryCallback& callback) {
    if (!std::filesystem::exists(path)) {
        // File does not exist
        return nullptr;
    }
 
    auto* sdat = new SDAT{path};
    auto packFile = std::unique_ptr<PackFile>(sdat);
 
    FileStream reader{sdat->fullFilePath};
    reader.seek_in(0);
 
    if (reader.read<uint32_t>() != SDAT_SIGNATURE) {
        // File is not an SDAT
        return nullptr;
    }
    reader.set_big_endian(true);
 
    // dirSize does not include the signature or itself
    reader.skip_in<uint32_t>(); //const auto dirSize = reader.read<uint32_t>();
 
    const auto entryCount = reader.read<uint32_t>();
 
    for (uint32_t i = 0; i < entryCount; i++) {
        Entry entry = createNewEntry();
 
        entry.offset = reader.read<uint32_t>();
        entry.length = reader.read<uint32_t>();
 
        const auto entryPathOffset = reader.read<uint32_t>();
        const auto oldPos = reader.tell_in();
        const auto entryPath = sdat->cleanEntryPath(reader.seek_in_u(entryPathOffset + sizeof(uint32_t) * 2).read_string());
        reader.seek_in_u(oldPos);
 
        sdat->entries.emplace(entryPath, entry);
 
        if (callback) {
            callback(entryPath, entry);
        }
    }
 
    return packFile;
}
 
std::optional<std::vector<std::byte>> SDAT::readEntry(const std::string& path_) const {
    const auto path = this->cleanEntryPath(path_);
    const auto entry = this->findEntry(path);
    if (!entry) {
        return std::nullopt;
    }
    if (entry->unbaked) {
        return readUnbakedEntry(*entry);
    }
 
    // It's baked into the file on disk
    FileStream stream{this->fullFilePath};
    if (!stream) {
        return std::nullopt;
    }
    stream.seek_in_u(entry->offset);
    return stream.read_bytes(entry->length);
}
 
void SDAT::addEntryInternal(Entry& entry, const std::string&, std::vector<std::byte>& buffer, EntryOptions) {
    entry.length = buffer.size();
 
    // Offset will be reset when it's baked
    entry.offset = 0;
}
 
bool SDAT::bake(const std::string& outputDir_, BakeOptions, const EntryCallback& callback) {
    // Get the proper file output folder
    const std::string outputDir = this->getBakeOutputDir(outputDir_);
    const std::string outputPath = outputDir + '/' + this->getFilename();
 
    // Reconstruct data for ease of access
    uint32_t pathBlockSize = 0;
    std::vector<std::pair<std::string, Entry*>> entriesToBake;
    this->runForAllEntriesInternal([&pathBlockSize, &entriesToBake](const std::string& path, Entry& entry) {
        pathBlockSize += path.size() + 1;
        entriesToBake.emplace_back(path, &entry);
    });
 
    // Read data before overwriting, we don't know if we're writing to ourself
    std::vector<std::byte> fileData;
    for (auto& [path, entry] : entriesToBake) {
        if (auto binData = this->readEntry(path)) {
            entry->offset = fileData.size();
 
            fileData.insert(fileData.end(), binData->begin(), binData->end());
        } else {
            entry->offset = 0;
            entry->length = 0;
        }
    }
 
    {
        FileStream stream{outputPath, FileStream::OPT_TRUNCATE | FileStream::OPT_CREATE_IF_NONEXISTENT};
        stream.seek_out(0);
 
        const auto dirSize = sizeof(uint32_t) * 3 * (entriesToBake.size() + 1) + pathBlockSize;
 
        // Signature + dir size + entry count
        stream
            .write(SDAT_SIGNATURE)
            .set_big_endian(true)
            .write<uint32_t>(dirSize - 8)
            .write<uint32_t>(entriesToBake.size())
            .pad(dirSize - sizeof(uint32_t))
            .seek_out(sizeof(uint32_t) * 3);
 
        // Directory
        auto currentPathOffset = dirSize - pathBlockSize;
        for (const auto& [path, entry] : entriesToBake) {
            stream
                .write<uint32_t>(entry->offset + dirSize)
                .write<uint32_t>(entry->length)
                .write<uint32_t>(currentPathOffset - sizeof(uint32_t) * 2);
 
            const auto oldPos = stream.tell_out();
            stream.seek_out_u(currentPathOffset).write(path);
            currentPathOffset = stream.tell_out();
            stream.seek_out_u(oldPos);
 
            if (callback) {
                callback(path, *entry);
            }
        }
 
        // File data
        stream.seek_out_u(dirSize).write(fileData);
    }
 
    // Clean up
    this->mergeUnbakedEntries();
    PackFile::setFullFilePath(outputDir);
    return true;
}
 
Attribute SDAT::getSupportedEntryAttributes() const {
    using enum Attribute;
    return LENGTH;
}