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https://github.com/tfussell/xlnt.git
synced 2024-03-22 13:11:17 +08:00
implement input and output streambufs for compound document streams
This commit is contained in:
Thomas Fussell
parent
f42d3eee74
commit
b7bf16d47c
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@ -51,6 +51,24 @@ int compare_keys(const std::string &left, const std::string &right)
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return to_lower(left).compare(to_lower(right));
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}
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std::vector<std::string> split_path(const std::string &path)
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{
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auto split = std::vector<std::string>();
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auto current = path.find('/');
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auto prev = std::size_t(0);
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while (current != std::string::npos)
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{
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split.push_back(path.substr(prev, current - prev));
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prev = current + 1;
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current = path.find('/', prev);
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}
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split.push_back(path.substr(prev));
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return split;
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}
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std::string join_path(const std::vector<std::string> &path)
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{
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auto joined = std::string();
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@ -84,9 +102,11 @@ class compound_document_istreambuf : public std::streambuf
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using int_type = std::streambuf::int_type;
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public:
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compound_document_istreambuf(const std::string &filename)
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: data_(filename.begin(), filename.end()),
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position_(0)
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compound_document_istreambuf(const compound_document_entry &entry, compound_document &document)
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: entry_(entry),
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document_(document),
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position_(0),
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sector_writer_(current_sector_)
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{
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}
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@ -96,32 +116,43 @@ public:
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private:
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int_type underflow()
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{
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if (position_ == data_.size())
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if (position_ == entry_.size)
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{
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return traits_type::eof();
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}
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return traits_type::to_int_type(static_cast<char>(data_[position_]));
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sector_writer_.reset();
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if (entry_.size < document_.header_.threshold)
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{
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document_.read_short_sector_chain(entry_.start,
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sector_writer_, sector_id(position_ / document_.short_sector_size()), 1);
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return current_sector_[position_ % document_.short_sector_size()];
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}
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else
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{
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document_.read_sector_chain(entry_.start,
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sector_writer_, sector_id(position_ / document_.sector_size()), 1);
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return current_sector_[position_ % document_.sector_size()];
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}
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}
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int_type uflow()
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{
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if (position_ == data_.size())
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{
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return traits_type::eof();
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}
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auto result = underflow();
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++position_;
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return traits_type::to_int_type(static_cast<char>(data_[position_++]));
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return result;
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}
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std::streamsize showmanyc()
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{
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if (position_ == data_.size())
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if (position_ == entry_.size)
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{
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return static_cast<std::streamsize>(-1);
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}
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return static_cast<std::streamsize>(data_.size() - position_);
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return static_cast<std::streamsize>(entry_.size - position_);
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}
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std::streampos seekoff(std::streamoff off, std::ios_base::seekdir way, std::ios_base::openmode)
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@ -132,7 +163,7 @@ private:
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}
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else if (way == std::ios_base::end)
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{
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position_ = data_.size();
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position_ = entry_.size;
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}
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if (off < 0)
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@ -149,9 +180,9 @@ private:
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}
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else if (off > 0)
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{
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if (static_cast<std::size_t>(off) + position_ > data_.size())
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if (static_cast<std::size_t>(off) + position_ > entry_.size)
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{
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position_ = data_.size();
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position_ = entry_.size;
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return static_cast<std::ptrdiff_t>(-1);
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}
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else
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@ -169,9 +200,9 @@ private:
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{
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position_ = 0;
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}
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else if (static_cast<std::size_t>(sp) > data_.size())
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else if (static_cast<std::size_t>(sp) > entry_.size)
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{
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position_ = data_.size();
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position_ = entry_.size;
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}
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else
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{
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@ -182,7 +213,10 @@ private:
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}
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private:
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std::vector<std::uint8_t> data_;
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const compound_document_entry &entry_;
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compound_document &document_;
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binary_writer<byte> sector_writer_;
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std::vector<byte> current_sector_;
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std::size_t position_;
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};
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@ -194,44 +228,175 @@ class compound_document_ostreambuf : public std::streambuf
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using int_type = std::streambuf::int_type;
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public:
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compound_document_ostreambuf(const std::string &filename)
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: data_(filename.begin(), filename.end()),
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position_(0)
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compound_document_ostreambuf(compound_document_entry &entry, compound_document &document)
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: entry_(entry),
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document_(document),
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position_(0),
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sector_reader_(current_sector_),
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current_sector_(sector_size(), 0),
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chain_(document_.follow_chain(entry_.start, table()))
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{
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}
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compound_document_ostreambuf(const compound_document_ostreambuf &) = delete;
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compound_document_ostreambuf &operator=(const compound_document_ostreambuf &) = delete;
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private:
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int_type overflow(int_type c = traits_type::eof())
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virtual ~compound_document_ostreambuf()
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{
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if (c != traits_type::eof())
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if (position_ % 64 != 0)
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{
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data_.push_back(static_cast<std::uint8_t>(c));
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position_ = data_.size() - 1;
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write_sector();
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}
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return traits_type::to_int_type(static_cast<char>(data_[position_]));
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}
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std::streamsize xsputn(const char *s, std::streamsize n)
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private:
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bool short_stream()
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{
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if (data_.empty())
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return entry_.size < document_.header_.threshold;
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}
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sector_chain &table()
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{
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return short_stream()
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? document_.ssat_
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: document_.sat_;
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}
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std::size_t sector_size()
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{
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return short_stream()
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? document_.short_sector_size()
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: document_.short_sector_size();
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}
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void write_sector()
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{
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if (short_stream())
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{
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data_.resize(static_cast<std::size_t>(n));
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auto next_sector = document_.allocate_short_sector();
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document_.ssat_[chain_.back()] = next_sector;
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chain_.push_back(next_sector);
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document_.write_short_sector(sector_reader_, next_sector);
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}
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else
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{
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auto position_size = data_.size();
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auto required_size = static_cast<std::size_t>(position_ + static_cast<std::size_t>(n));
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data_.resize(std::max(position_size, required_size));
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auto next_sector = document_.allocate_sector();
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document_.sat_[chain_.back()] = next_sector;
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chain_.push_back(next_sector);
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document_.write_sector(sector_reader_, next_sector);
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}
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}
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int_type overflow(int_type c = traits_type::eof())
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{
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auto value = static_cast<std::uint8_t>(c);
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if (c != traits_type::eof())
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{
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current_sector_[position_ % sector_size()] = value;
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}
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std::copy(s, s + n, data_.begin() + static_cast<std::ptrdiff_t>(position_));
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position_ += static_cast<std::size_t>(n);
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if (entry_.start < 0)
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{
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entry_.start = entry_.size == document_.header_.threshold
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? document_.allocate_sector()
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: document_.allocate_short_sector();
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chain_.push_back(entry_.start);
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}
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return n;
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if (position_ % 64 == 0 && position_ > 0)
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{
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write_sector();
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std::fill(current_sector_.begin(), current_sector_.end(), byte(0));
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}
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if (c != traits_type::eof())
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{
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++position_;
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auto previous_size = entry_.size;
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entry_.size = std::max(entry_.size, static_cast<std::uint32_t>(position_));
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if (entry_.size >= document_.header_.threshold && previous_size < document_.header_.threshold)
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{
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convert_to_long_stream();
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}
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return traits_type::to_int_type(static_cast<char>(value));
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}
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else
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{
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return traits_type::eof();
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}
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}
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void convert_to_long_stream()
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{
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const auto sectors_per_sector = document_.sector_size() / document_.short_sector_size();
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current_sector_.resize(sector_size(), 0);
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std::fill(current_sector_.begin(), current_sector_.end(), byte(0));
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auto sector_writer = binary_writer<byte>(current_sector_);
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auto index = std::size_t(0);
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auto long_chain = sector_chain();
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entry_.start = document_.allocate_sector();
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long_chain.push_back(entry_.start);
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for (auto link : chain_)
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{
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document_.read_short_sector(link, sector_writer);
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document_.header_.num_short_sectors--;
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document_.ssat_[link] = FreeSector;
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if (index % sectors_per_sector == 0 && index > 0)
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{
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document_.write_sector(sector_reader_, long_chain.back());
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auto next_sector = document_.allocate_sector();
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document_.sat_[long_chain.back()] = next_sector;
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long_chain.push_back(next_sector);
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}
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}
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if (index % sectors_per_sector != 0)
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{
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document_.write_sector(sector_reader_, long_chain.back());
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}
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index = 0;
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auto previous = sector_id(0);
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for (auto link : document_.follow_chain(document_.entries_[0].start, document_.sat_))
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{
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auto ssat_index_start = document_.ssat_.begin() + index * sectors_per_sector;
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auto ssat_index_end = document_.ssat_.begin() + (index + 1) * sectors_per_sector;
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if (std::size_t(std::count(ssat_index_start, ssat_index_end, FreeSector)) == sectors_per_sector)
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{
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if (index > 0)
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{
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document_.sat_[previous] = document_.sat_[link];
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}
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else
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{
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document_.entries_[0].start = document_.sat_[link];
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}
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document_.sat_[link] = FreeSector;
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}
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previous = link;
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index++;
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}
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if (document_.header_.num_short_sectors == 0)
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{
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document_.entries_[0].start = EndOfChain;
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}
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// TODO: deallocate short sectors here
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chain_ = long_chain;
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}
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std::streampos seekoff(std::streamoff off, std::ios_base::seekdir way, std::ios_base::openmode)
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@ -242,7 +407,7 @@ private:
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}
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else if (way == std::ios_base::end)
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{
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position_ = data_.size();
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position_ = entry_.size;
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}
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if (off < 0)
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@ -259,9 +424,9 @@ private:
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}
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else if (off > 0)
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{
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if (static_cast<std::size_t>(off) + position_ > data_.size())
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if (static_cast<std::size_t>(off) + position_ > entry_.size)
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{
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position_ = data_.size();
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position_ = entry_.size;
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return static_cast<std::ptrdiff_t>(-1);
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}
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else
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@ -279,9 +444,9 @@ private:
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{
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position_ = 0;
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}
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else if (static_cast<std::size_t>(sp) > data_.size())
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else if (static_cast<std::size_t>(sp) > entry_.size)
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{
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position_ = data_.size();
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position_ = entry_.size;
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}
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else
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{
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@ -292,8 +457,12 @@ private:
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}
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private:
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std::vector<std::uint8_t> data_;
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compound_document_entry &entry_;
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compound_document &document_;
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binary_reader<byte> sector_reader_;
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std::vector<byte> current_sector_;
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std::size_t position_;
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sector_chain chain_;
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};
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@ -303,7 +472,7 @@ compound_document::compound_document(std::ostream &out)
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stream_out_(nullptr)
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{
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write_header();
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insert_entry("Root Entry", compound_document_entry::entry_type::RootStorage);
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insert_entry("/Root Entry", compound_document_entry::entry_type::RootStorage);
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}
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compound_document::compound_document(std::istream &in)
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@ -320,6 +489,12 @@ compound_document::compound_document(std::istream &in)
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compound_document::~compound_document()
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{
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close();
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}
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void compound_document::close()
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{
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stream_out_buffer_.reset(nullptr);
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}
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std::size_t compound_document::sector_size()
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@ -337,7 +512,7 @@ std::istream &compound_document::open_read_stream(const std::string &name)
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const auto entry_id = find_entry(name, compound_document_entry::entry_type::UserStream);
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const auto &entry = entries_.at(entry_id);
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stream_in_buffer_.reset(new compound_document_istreambuf(name));
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stream_in_buffer_.reset(new compound_document_istreambuf(entry, *this));
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stream_in_.rdbuf(stream_in_buffer_.get());
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return stream_in_;
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@ -350,7 +525,7 @@ std::ostream &compound_document::open_write_stream(const std::string &name)
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: insert_entry(name, compound_document_entry::entry_type::UserStream);
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auto &entry = entries_.at(entry_id);
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stream_out_buffer_.reset(new compound_document_ostreambuf(name));
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stream_out_buffer_.reset(new compound_document_ostreambuf(entry, *this));
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stream_out_.rdbuf(stream_out_buffer_.get());
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return stream_out_;
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@ -384,6 +559,26 @@ void compound_document::read_sector(sector_id id, binary_writer<T> &writer)
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writer.append(sector);
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}
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template<typename T>
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void compound_document::read_sector_chain(sector_id start, binary_writer<T> &writer)
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{
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for (auto link : follow_chain(start, sat_))
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{
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read_sector(link, writer);
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}
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}
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template<typename T>
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void compound_document::read_sector_chain(sector_id start, binary_writer<T> &writer, sector_id offset, std::size_t count)
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{
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auto chain = follow_chain(start, sat_);
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for (auto i = std::size_t(0); i < count; ++i)
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{
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read_sector(chain[offset + i], writer);
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}
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}
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template<typename T>
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void compound_document::read_short_sector(sector_id id, binary_writer<T> &writer)
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{
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@ -402,6 +597,26 @@ void compound_document::read_short_sector(sector_id id, binary_writer<T> &writer
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writer.append(container_reader, short_sector_size());
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}
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template<typename T>
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void compound_document::read_short_sector_chain(sector_id start, binary_writer<T> &writer)
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{
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for (auto link : follow_chain(start, ssat_))
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{
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read_short_sector(link, writer);
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}
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}
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template<typename T>
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void compound_document::read_short_sector_chain(sector_id start, binary_writer<T> &writer, sector_id offset, std::size_t count)
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{
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auto chain = follow_chain(start, ssat_);
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for (auto i = std::size_t(0); i < count; ++i)
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{
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read_short_sector(chain[offset + i], writer);
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}
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}
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sector_id compound_document::allocate_sector()
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{
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const auto sectors_per_sector = sector_size() / sizeof(sector_id);
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@ -562,10 +777,18 @@ directory_id compound_document::next_empty_entry()
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// entry_id is now equal to entries_.size()
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if (header_.directory_start < 0)
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{
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header_.directory_start = allocate_sector();
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}
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else
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{
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auto directory_chain = follow_chain(header_.directory_start, sat_);
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sat_[directory_chain.back()] = allocate_sector();
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}
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const auto entries_per_sector = sector_size()
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/ sizeof(compound_document_entry);
|
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auto new_sector = allocate_sector();
|
||||
// TODO: connect chains here
|
||||
|
||||
for (auto i = std::size_t(0); i < entries_per_sector; ++i)
|
||||
{
|
||||
|
|
@ -585,13 +808,22 @@ directory_id compound_document::insert_entry(
|
|||
auto entry_id = next_empty_entry();
|
||||
auto &entry = entries_[entry_id];
|
||||
|
||||
entry.name(name);
|
||||
auto parent_id = directory_id(0);
|
||||
auto split = split_path(name);
|
||||
auto filename = split.back();
|
||||
split.pop_back();
|
||||
|
||||
if (split.size() > 1)
|
||||
{
|
||||
parent_id = find_entry(join_path(split), compound_document_entry::entry_type::UserStorage);
|
||||
parent_storage_[entry_id] = parent_id;
|
||||
}
|
||||
|
||||
entry.name(filename);
|
||||
entry.type = type;
|
||||
|
||||
write_entry(entry_id);
|
||||
|
||||
// TODO: parse path from name and use correct parent storage instead of 0
|
||||
tree_insert(entry_id, 0);
|
||||
tree_insert(entry_id, parent_id);
|
||||
write_directory();
|
||||
|
||||
return entry_id;
|
||||
}
|
||||
|
|
@ -643,18 +875,23 @@ void compound_document::print_directory()
|
|||
}
|
||||
}
|
||||
|
||||
void compound_document::write_directory()
|
||||
{
|
||||
for (auto entry_id = std::size_t(0); entry_id < entries_.size(); ++entry_id)
|
||||
{
|
||||
write_entry(directory_id(entry_id++));
|
||||
}
|
||||
}
|
||||
|
||||
void compound_document::read_directory()
|
||||
{
|
||||
const auto entries_per_sector = sector_size() / sizeof(compound_document_entry);
|
||||
auto entry_id = directory_id(0);
|
||||
const auto num_entries = follow_chain(header_.directory_start, sat_).size() * entries_per_sector;
|
||||
|
||||
for (auto sector : follow_chain(header_.directory_start, sat_))
|
||||
for (auto entry_id = std::size_t(0); entry_id < num_entries; ++entry_id)
|
||||
{
|
||||
for (auto i = std::size_t(0); i < entries_per_sector; ++i)
|
||||
{
|
||||
entries_.push_back(compound_document_entry());
|
||||
read_entry(entry_id++);
|
||||
}
|
||||
entries_.push_back(compound_document_entry());
|
||||
read_entry(directory_id(entry_id));
|
||||
}
|
||||
|
||||
auto stack = std::vector<directory_id>();
|
||||
|
|
|
|||
|
|
@ -129,10 +129,23 @@ public:
|
|||
std::ostream &open_write_stream(const std::string &filename);
|
||||
|
||||
private:
|
||||
friend class compound_document_istreambuf;
|
||||
friend class compound_document_ostreambuf;
|
||||
|
||||
template<typename T>
|
||||
void read_sector(sector_id id, binary_writer<T> &writer);
|
||||
template<typename T>
|
||||
void read_sector_chain(sector_id id, binary_writer<T> &writer);
|
||||
template<typename T>
|
||||
void read_sector_chain(sector_id start, binary_writer<T> &writer, sector_id offset, std::size_t count);
|
||||
template<typename T>
|
||||
void read_short_sector(sector_id id, binary_writer<T> &writer);
|
||||
template<typename T>
|
||||
void read_short_sector_chain(sector_id start, binary_writer<T> &writer);
|
||||
template<typename T>
|
||||
void read_short_sector_chain(sector_id start, binary_writer<T> &writer, sector_id offset, std::size_t count);
|
||||
|
||||
sector_chain follow_chain(sector_id start, const sector_chain &table);
|
||||
|
||||
template<typename T>
|
||||
void write_sector(binary_reader<T> &reader, sector_id id);
|
||||
|
|
@ -151,13 +164,12 @@ private:
|
|||
void write_sat();
|
||||
void write_ssat();
|
||||
void write_entry(directory_id id);
|
||||
void write_directory();
|
||||
|
||||
std::size_t sector_size();
|
||||
std::size_t short_sector_size();
|
||||
std::size_t sector_data_start();
|
||||
|
||||
sector_chain follow_chain(sector_id start, const sector_chain &table);
|
||||
|
||||
void print_directory();
|
||||
|
||||
sector_id allocate_msat_sector();
|
||||
|
|
|
|||
|
|
@ -73,6 +73,27 @@ void print_summary()
|
|||
|
||||
int main()
|
||||
{
|
||||
std::ifstream file("C:/Users/Thomas/Development/xlnt/tests/data/6_encrypted_libre.xlsx", std::ios::binary);
|
||||
const auto bytes2 = xlnt::detail::to_vector(file);
|
||||
xlnt::detail::vector_istreambuf buffer(bytes2);
|
||||
std::istream buffer_stream(&buffer);
|
||||
xlnt::detail::compound_document doc2(buffer_stream);
|
||||
auto info = xlnt::detail::to_vector(doc2.open_read_stream("/EncryptionInfo"));
|
||||
auto package = xlnt::detail::to_vector(doc2.open_read_stream("/EncryptedPackage"));
|
||||
|
||||
std::vector<std::uint8_t> bytes;
|
||||
xlnt::detail::vector_ostreambuf byte_buffer(bytes);
|
||||
std::ostream byte_buffer_stream(&byte_buffer);
|
||||
xlnt::detail::compound_document doc(byte_buffer_stream);
|
||||
auto &a_stream = doc.open_write_stream("/aaa");
|
||||
xlnt::detail::to_stream(std::vector<std::uint8_t>(4095, 'a'), a_stream);
|
||||
auto &b_stream = doc.open_write_stream("/bbb");
|
||||
xlnt::detail::to_stream(std::vector<std::uint8_t>(4095, 'b'), b_stream);
|
||||
auto &c_stream = doc.open_write_stream("/ccc");
|
||||
xlnt::detail::to_stream(std::vector<std::uint8_t>(4095, 'c'), c_stream);
|
||||
std::ofstream file2("cd.xlsx", std::ios::binary);
|
||||
xlnt::detail::to_stream(bytes, file2);
|
||||
|
||||
// cell
|
||||
run_tests<cell_test_suite>();
|
||||
run_tests<index_types_test_suite>();
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user