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This commit is contained in:
Thomas Fussell 2017-04-24 19:23:51 -04:00
parent c642db6cc2
commit be59d522a6
2 changed files with 169 additions and 251 deletions
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372
source/detail/cryptography/compound_document.cpp
View File

@ -25,11 +25,7 @@
#include <array> #include <array>
#include <algorithm> #include <algorithm>
#include <cstring> #include <cstring>
#include <fstream>
#include <iostream>
#include <list>
#include <string> #include <string>
#include <unordered_set>
#include <vector> #include <vector>
#include <detail/binary.hpp> #include <detail/binary.hpp>
@ -80,33 +76,11 @@ bool header_is_valid(const compound_document_header &h)
return true; return true;
} }
compound_document_entry &look_up_entry(binary_writer &writer, sector_id directory_start, directory_id index)
{
return *reinterpret_cast<compound_document_entry *>(writer.data().data());
}
const compound_document_entry &look_up_entry(binary_reader &reader, sector_id directory_start, directory_id index)
{
return *reinterpret_cast<const compound_document_entry *>(reader.data().data());
}
const directory_id End = -1; const directory_id End = -1;
sector_id next_free_sector(const sector_chain &allocation_table) void recolor_entries(std::vector<compound_document_entry> &entries)
{ {
auto index = sector_id(0); using entry_type = compound_document_entry::entry_type;
for (auto sector : allocation_table)
{
if (sector == FreeSector)
{
return index;
}
++index;
}
return FreeSector;
} }
} // namespace } // namespace
@ -118,21 +92,20 @@ compound_document::compound_document(std::vector<std::uint8_t> &data)
: writer_(new binary_writer(data)), : writer_(new binary_writer(data)),
reader_(new binary_reader(data)) reader_(new binary_reader(data))
{ {
data.resize(sizeof(compound_document_header)); header_ = compound_document_header();
header_.directory_start = allocate_sectors(1);
auto new_header = compound_document_header(); write_header();
new_header.msat.fill(FreeSector);
header() = new_header;
auto &root = insert_entry(u"Root Entry"); insert_entry(u"Root Entry", compound_document_entry::entry_type::RootStorage);
root.type = compound_document_entry::entry_type::RootStorage;
root.color = compound_document_entry::entry_color::Black;
} }
compound_document::compound_document(const std::vector<std::uint8_t> &data) compound_document::compound_document(const std::vector<std::uint8_t> &data)
: reader_(new binary_reader(data)) : reader_(new binary_reader(data))
{ {
if (!header_is_valid(header())) read_header();
if (!header_is_valid(header_))
{ {
throw xlnt::exception("bad ole"); throw xlnt::exception("bad ole");
} }
@ -140,31 +113,31 @@ compound_document::compound_document(const std::vector<std::uint8_t> &data)
read_msat(); read_msat();
read_sat(); read_sat();
read_ssat(); read_ssat();
read_directory_tree();
} }
compound_document::~compound_document() compound_document::~compound_document()
{ {
} }
std::size_t compound_document::sector_size()
{
return static_cast<std::size_t>(1) << header_.sector_size_power;
}
std::size_t compound_document::short_sector_size()
{
return static_cast<std::size_t>(1) << header_.short_sector_size_power;
}
std::vector<std::uint8_t> compound_document::read_stream(const std::u16string &name) std::vector<std::uint8_t> compound_document::read_stream(const std::u16string &name)
{ {
if (!contains_entry(name)) const auto &entry = find_entry(name);
{
throw xlnt::exception("document doesn't contain stream with the given name");
}
auto &entry = find_entry(name);
auto stream_data = std::vector<byte>();
if (entry.size < header().threshold)
{
stream_data = read_short(entry.start);
}
else
{
stream_data = read(entry.start);
}
auto stream_data = (entry.size < header_.threshold)
? read_short(entry.start)
: read(entry.start);
stream_data.resize(entry.size); stream_data.resize(entry.size);
return stream_data; return stream_data;
@ -172,28 +145,28 @@ std::vector<std::uint8_t> compound_document::read_stream(const std::u16string &n
void compound_document::write_stream(const std::u16string &name, const std::vector<std::uint8_t> &data) void compound_document::write_stream(const std::u16string &name, const std::vector<std::uint8_t> &data)
{ {
const auto sector_size = header().sector_size(); const auto num_sectors = data.size() / sector_size() + (data.size() % sector_size() ? 1 : 0);
const auto num_sectors = data.size() / sector_size + (data.size() % sector_size ? 1 : 0);
auto &entry = contains_entry(name) ? find_entry(name) : insert_entry(name); auto &entry = contains_entry(name)
? find_entry(name)
entry.type = compound_document_entry::entry_type::UserStream; : insert_entry(name, compound_document_entry::entry_type::UserStream);
entry.start = allocate_sector(num_sectors); entry.start = allocate_sectors(num_sectors);
write(data, entry.start); write(data, entry.start);
write_directory_tree();
} }
void compound_document::write(const std::vector<byte> &data, sector_id start) void compound_document::write(const std::vector<byte> &data, sector_id start)
{ {
const auto sector_size = header().sector_size();
const auto header_size = sizeof(compound_document_header); const auto header_size = sizeof(compound_document_header);
const auto num_sectors = data.size() / sector_size + (data.size() % sector_size ? 1 : 0); const auto num_sectors = data.size() / sector_size() + (data.size() % sector_size() ? 1 : 0);
auto current_sector = start; auto current_sector = start;
for (auto i = std::size_t(0); i < num_sectors; ++i) for (auto i = std::size_t(0); i < num_sectors; ++i)
{ {
auto stream_position = i * sector_size; auto stream_position = i * sector_size();
auto stream_size = std::min(sector_size, data.size() - stream_position); auto stream_size = std::min(sector_size(), data.size() - stream_position);
writer_->offset(header_size + sector_size * current_sector); writer_->offset(header_size + sector_size() * current_sector);
writer_->append(data, stream_position, stream_size); writer_->append(data, stream_position, stream_size);
current_sector = sat_[current_sector]; current_sector = sat_[current_sector];
} }
@ -201,37 +174,28 @@ void compound_document::write(const std::vector<byte> &data, sector_id start)
void compound_document::write_short(const std::vector<byte> &data, sector_id start) void compound_document::write_short(const std::vector<byte> &data, sector_id start)
{ {
const auto sector_size = header().sector_size(); const auto num_sectors = data.size() / sector_size() + (data.size() % sector_size() ? 1 : 0);
const auto num_sectors = data.size() / sector_size + (data.size() % sector_size ? 1 : 0);
auto current_sector = start; auto current_sector = start;
for (auto i = std::size_t(0); i < num_sectors; ++i) for (auto i = std::size_t(0); i < num_sectors; ++i)
{ {
auto position = sector_size * current_sector; auto position = sector_size() * current_sector;
auto current_sector_size = data.size() % sector_size; auto current_sector_size = data.size() % sector_size();
writer_->append(data, position, current_sector_size); writer_->append(data, position, current_sector_size);
current_sector = ssat_[current_sector]; current_sector = ssat_[current_sector];
} }
} }
compound_document_header &compound_document::header()
{
reader_->offset(0);
return *const_cast<compound_document_header *>(
&reader_->read_reference<compound_document_header>());
}
std::vector<byte> compound_document::read(sector_id current) std::vector<byte> compound_document::read(sector_id current)
{ {
const auto sector_size = header().sector_size();
const auto header_size = sizeof(compound_document_header); const auto header_size = sizeof(compound_document_header);
auto sector_data = std::vector<byte>(); auto sector_data = std::vector<byte>();
auto sector_data_writer = binary_writer(sector_data); auto sector_data_writer = binary_writer(sector_data);
while (current >= 0) while (current >= 0)
{ {
reader_->offset(header_size + sector_size * current); reader_->offset(header_size + sector_size() * current);
auto sector_data = reader_->read_vector<byte>(sector_size); auto sector_data = reader_->read_vector<byte>(sector_size());
sector_data_writer.append(sector_data); sector_data_writer.append(sector_data);
current = sat_[current]; current = sat_[current];
} }
@ -241,8 +205,6 @@ std::vector<byte> compound_document::read(sector_id current)
std::vector<byte> compound_document::read_short(sector_id current_short) std::vector<byte> compound_document::read_short(sector_id current_short)
{ {
const auto short_sector_size = header().short_sector_size();
const auto sector_size = header().sector_size();
const auto header_size = sizeof(compound_document_header); const auto header_size = sizeof(compound_document_header);
auto sector_data = std::vector<byte>(); auto sector_data = std::vector<byte>();
auto sector_data_writer = binary_writer(sector_data); auto sector_data_writer = binary_writer(sector_data);
@ -250,19 +212,19 @@ std::vector<byte> compound_document::read_short(sector_id current_short)
while (current_short >= 0) while (current_short >= 0)
{ {
auto short_position = static_cast<std::size_t>(short_sector_size * current_short); auto short_position = static_cast<std::size_t>(short_sector_size() * current_short);
auto current_sector_index = 0; auto current_sector_index = 0;
auto current_sector = first_short_sector; auto current_sector = first_short_sector;
while (current_sector_index < short_position / sector_size) while (current_sector_index < short_position / sector_size())
{ {
current_sector = sat_[current_sector]; current_sector = sat_[current_sector];
++current_sector_index; ++current_sector_index;
} }
auto offset = short_position % sector_size; auto offset = short_position % sector_size();
reader_->offset(header_size + sector_size * current_sector + offset); reader_->offset(header_size + sector_size() * current_sector + offset);
auto sector_data = reader_->read_vector<byte>(short_sector_size); auto sector_data = reader_->read_vector<byte>(short_sector_size());
sector_data_writer.append(sector_data); sector_data_writer.append(sector_data);
current_short = ssat_[current_short]; current_short = ssat_[current_short];
@ -274,16 +236,16 @@ std::vector<byte> compound_document::read_short(sector_id current_short)
void compound_document::read_msat() void compound_document::read_msat()
{ {
msat_ = sector_chain( msat_ = sector_chain(
header().msat.begin(), header_.msat.begin(),
header().msat.begin() header_.msat.begin()
+ std::min(header().msat.size(), + std::min(header_.msat.size(),
static_cast<std::size_t>(header().num_msat_sectors))); static_cast<std::size_t>(header_.num_msat_sectors)));
if (header().num_msat_sectors > std::uint32_t(109)) if (header_.num_msat_sectors > std::uint32_t(109))
{ {
auto current_sector = header().sector_table_start; auto current_sector = header_.extra_msat_start;
for (auto r = std::uint32_t(0); r < header().num_extra_msat_sectors; ++r) for (auto r = std::uint32_t(0); r < header_.num_extra_msat_sectors; ++r)
{ {
auto current_sector_data = read({ current_sector }); auto current_sector_data = read({ current_sector });
auto current_sector_reader = binary_reader(current_sector_data); auto current_sector_reader = binary_reader(current_sector_data);
@ -304,13 +266,10 @@ void compound_document::read_sat()
{ {
sat_.clear(); sat_.clear();
const auto sector_size = header().sector_size();
const auto sector_data_start = sizeof(compound_document_header);
for (auto msat_sector : msat_) for (auto msat_sector : msat_)
{ {
reader_->offset(sector_data_start + sector_size * msat_sector); reader_->offset(sector_data_start() + sector_size() * msat_sector);
auto sat_sectors = reader_->read_vector<sector_id>(sector_size / sizeof(sector_id)); auto sat_sectors = reader_->read_vector<sector_id>(sector_size() / sizeof(sector_id));
std::copy( std::copy(
sat_sectors.begin(), sat_sectors.begin(),
@ -322,15 +281,12 @@ void compound_document::read_sat()
void compound_document::read_ssat() void compound_document::read_ssat()
{ {
ssat_.clear(); ssat_.clear();
auto current = header_.short_table_start;
const auto sector_size = header().sector_size();
const auto sector_data_start = sizeof(compound_document_header);
auto current = header().short_table_start;
while (current >= 0) while (current >= 0)
{ {
reader_->offset(sector_data_start + sector_size * current); reader_->offset(sector_data_start() + sector_size() * current);
auto ssat_sectors = reader_->read_vector<sector_id>(sector_size / sizeof(sector_id)); auto ssat_sectors = reader_->read_vector<sector_id>(sector_size() / sizeof(sector_id));
std::copy( std::copy(
ssat_sectors.begin(), ssat_sectors.begin(),
@ -341,11 +297,10 @@ void compound_document::read_ssat()
} }
} }
sector_id compound_document::allocate_sector(std::size_t count) sector_id compound_document::allocate_sectors(std::size_t count)
{ {
const auto sector_data_start = sizeof(compound_document_header); const auto sector_data_start = sizeof(compound_document_header);
const auto sector_size = header().sector_size(); const auto sectors_per_sector = sector_size() / sizeof(sector_id);
const auto sectors_per_sector = sector_size / sizeof(sector_id);
auto num_free = std::count(sat_.begin(), sat_.end(), FreeSector); auto num_free = std::count(sat_.begin(), sat_.end(), FreeSector);
if (num_free < count) if (num_free < count)
@ -357,29 +312,24 @@ sector_id compound_document::allocate_sector(std::size_t count)
sat_.resize(new_size, FreeSector); sat_.resize(new_size, FreeSector);
// allocate new sat sector // allocate new sat sector
auto new_sat_sector = allocate_sector(1); auto new_sat_sector = allocate_sectors(1);
msat_.push_back(new_sat_sector); msat_.push_back(new_sat_sector);
++header().num_msat_sectors; ++header_.num_msat_sectors;
if (header().sector_table_start == -1) writer_->offset(sector_data_start + new_sat_sector * sector_size());
{
header().sector_table_start = new_sat_sector;
}
writer_->offset(sector_data_start + new_sat_sector * sector_size);
writer_->append(sat_, sat_.size() - sectors_per_sector, sectors_per_sector); writer_->append(sat_, sat_.size() - sectors_per_sector, sectors_per_sector);
if (msat_.size() > std::size_t(109)) if (msat_.size() > std::size_t(109))
{ {
// allocate extra msat sector // allocate extra msat sector
++header().num_extra_msat_sectors; ++header_.num_extra_msat_sectors;
auto new_msat_sector = allocate_sector(1); auto new_msat_sector = allocate_sectors(1);
writer_->offset(sector_data_start + new_msat_sector * sector_size); writer_->offset(sector_data_start + new_msat_sector * sector_size());
writer_->write(new_msat_sector); writer_->write(new_msat_sector);
} }
else else
{ {
header().msat.at(msat_.size() - 1) = new_sat_sector; header_.msat.at(msat_.size() - 1) = new_sat_sector;
} }
} }
@ -394,9 +344,9 @@ sector_id compound_document::allocate_sector(std::size_t count)
const auto next = sector_id(next_iter - sat_.begin()); const auto next = sector_id(next_iter - sat_.begin());
sat_[current] = (allocated == count - 1) ? -2 : next; sat_[current] = (allocated == count - 1) ? -2 : next;
if (sector_data_start + (current + 1) * sector_size > writer_->size()) if (sector_data_start + (current + 1) * sector_size() > writer_->size())
{ {
writer_->extend(sector_size); writer_->extend(sector_size());
} }
current = next; current = next;
@ -406,141 +356,105 @@ sector_id compound_document::allocate_sector(std::size_t count)
return start; return start;
} }
compound_document_entry &compound_document::insert_entry(const std::u16string &name) compound_document_entry &compound_document::insert_entry(
const std::u16string &name,
compound_document_entry::entry_type type)
{ {
const auto entry_size = sizeof(compound_document_entry); entries_.push_back(compound_document_entry());
const auto sector_size = header().sector_size(); auto &entry = entries_.back();
const auto sector_data_start = sizeof(compound_document_header); entry.name(name);
const auto entries_per_sector = static_cast<directory_id>(sector_size / entry_size);
auto current_sector_id = header().directory_start; write_directory_tree();
if (current_sector_id == -1) return entry;
}
void compound_document::write_directory_tree()
{
const auto entries_per_sector = static_cast<directory_id>(sector_size()
/ sizeof(compound_document_entry));
const auto required_sectors = entries_.size() / entries_per_sector
+ (entries_.size() % entries_per_sector) ? 1 : 0;
auto current_sector_id = header_.directory_start;
auto entry_index = directory_id(0);
recolor_entries(entries_);
for (auto &e : entries_)
{ {
current_sector_id = allocate_sector(); writer_->offset(sector_data_start() + current_sector_id * sector_size());
header().directory_start = current_sector_id; writer_->write(e);
auto sector_entries = std::vector<compound_document_entry>(entries_per_sector); ++entry_index;
writer_->offset(sector_data_start + current_sector_id * sector_size); if (entry_index % entries_per_sector == 0)
writer_->append(sector_entries);
}
auto sector_empty_entry_index = directory_id(0);
auto any_sector_empty_entry = false;
while (current_sector_id >= 0 && !any_sector_empty_entry)
{
reader_->offset(sector_data_start + current_sector_id * sector_size);
for (auto i = directory_id(0); i < entries_per_sector; ++i)
{
const auto &current_entry = reader_->read_reference<compound_document_entry>();
if (current_entry.type == compound_document_entry::entry_type::Empty)
{
sector_empty_entry_index = i;
any_sector_empty_entry = true;
break;
}
if (current_entry.name() == name)
{
throw xlnt::exception("already exists");
}
}
if (!any_sector_empty_entry)
{ {
current_sector_id = sat_[current_sector_id]; current_sector_id = sat_[current_sector_id];
} }
} }
if (!any_sector_empty_entry)
{
// add sector
}
reader_->offset(sector_data_start
+ current_sector_id * sector_size
+ sector_empty_entry_index * entry_size);
auto &new_entry = const_cast<compound_document_entry &>(
reader_->read_reference<compound_document_entry>());
new_entry.name(name);
new_entry.type = compound_document_entry::entry_type::UserStream;
return new_entry;
} }
compound_document_entry &compound_document::find_entry(const std::u16string &name) std::size_t compound_document::sector_data_start()
{ {
const auto entry_size = sizeof(compound_document_entry); return sizeof(compound_document_header);
const auto sector_size = header().sector_size(); }
const auto sector_data_start = sizeof(compound_document_header);
auto current_sector_id = header().directory_start;
while (current_sector_id >= 0) bool compound_document::contains_entry(const std::u16string &path)
{
for (auto &e : entries_)
{ {
reader_->offset(sector_data_start + current_sector_id * sector_size); if (e.name() == path)
for (auto i = std::size_t(0); i < sector_size / entry_size; ++i)
{ {
const auto &current_entry = reader_->read_reference<compound_document_entry>(); return true;
if (current_entry.name() == name)
{
return const_cast<compound_document_entry &>(current_entry);
}
} }
current_sector_id = sat_[current_sector_id];
}
throw xlnt::exception("not found");
}
compound_document_entry &compound_document::find_entry(directory_id id)
{
return look_up_entry(*writer_, 0, 0);
}
bool compound_document::contains_entry(const std::u16string &name)
{
const auto entry_size = sizeof(compound_document_entry);
const auto sector_size = header().sector_size();
const auto sector_data_start = sizeof(compound_document_header);
auto current_sector_id = header().directory_start;
while (current_sector_id >= 0)
{
reader_->offset(sector_data_start + current_sector_id * sector_size);
for (auto i = std::size_t(0); i < sector_size / entry_size; ++i)
{
const auto &current_entry = reader_->read_reference<compound_document_entry>();
if (current_entry.type != compound_document_entry::entry_type::Empty
&& current_entry.name() == name)
{
return true;
}
}
current_sector_id = sat_[current_sector_id];
} }
return false; return false;
} }
std::vector<directory_id> compound_document::find_siblings(directory_id entry) void compound_document::write_header()
{ {
return {}; writer_->offset(0);
writer_->write(header_);
} }
std::vector<directory_id> compound_document::children(directory_id entry) void compound_document::read_header()
{ {
return {}; reader_->offset(0);
header_ = reader_->read<compound_document_header>();
}
compound_document_entry &compound_document::find_entry(const std::u16string &name)
{
for (auto &e : entries_)
{
if (e.name() == name)
{
return e;
}
}
throw xlnt::exception("not found");
}
void compound_document::read_directory_tree()
{
entries_.clear();
auto current_sector_id = header_.directory_start;
auto current_id = directory_id(0);
while (current_sector_id >= 0)
{
reader_->offset(sector_data_start() + current_sector_id * sector_size());
for (auto i = std::size_t(0); i < sector_size() / sizeof(compound_document_entry); ++i)
{
entries_.push_back(reader_->read<compound_document_entry>());
}
current_sector_id = sat_[current_sector_id];
}
} }
} // namespace detail } // namespace detail

48
source/detail/cryptography/compound_document.hpp
View File

@ -28,6 +28,7 @@
#include <array> #include <array>
#include <memory> #include <memory>
#include <string> #include <string>
#include <unordered_map>
#include <detail/binary.hpp> #include <detail/binary.hpp>
@ -46,16 +47,6 @@ struct compound_document_header
little_endian = 0xFEFF little_endian = 0xFEFF
}; };
std::size_t sector_size() const
{
return static_cast<std::size_t>(1) << sector_size_power;
}
std::size_t short_sector_size() const
{
return static_cast<std::size_t>(1) << short_sector_size_power;
}
std::uint64_t file_id = 0xe11ab1a1e011cfd0; std::uint64_t file_id = 0xe11ab1a1e011cfd0;
std::array<std::uint8_t, 16> ignore1 = { { 0 } }; std::array<std::uint8_t, 16> ignore1 = { { 0 } };
std::uint16_t revision = 0x003E; std::uint16_t revision = 0x003E;
@ -70,7 +61,7 @@ struct compound_document_header
std::uint32_t threshold = 4096; std::uint32_t threshold = 4096;
sector_id short_table_start = -1; sector_id short_table_start = -1;
std::uint32_t num_short_sectors = 0; std::uint32_t num_short_sectors = 0;
sector_id sector_table_start = -1; sector_id extra_msat_start = -2;
std::uint32_t num_extra_msat_sectors = 0; std::uint32_t num_extra_msat_sectors = 0;
std::array<sector_id, 109> msat = { 0 }; std::array<sector_id, 109> msat = { 0 };
}; };
@ -109,13 +100,13 @@ struct compound_document_entry
std::array<char16_t, 32> name_array = { { 0 } }; std::array<char16_t, 32> name_array = { { 0 } };
std::uint16_t name_length = 0; std::uint16_t name_length = 0;
entry_type type; entry_type type = entry_type::Empty;
entry_color color; entry_color color = entry_color::Red;
directory_id prev = -1; directory_id prev = -1;
directory_id next = -1; directory_id next = -1;
directory_id child = -1; directory_id child = -1;
std::array<std::uint8_t, 36> ignore; std::array<std::uint8_t, 36> ignore;
sector_id start = 0; sector_id start = -1;
std::uint32_t size = 0; std::uint32_t size = 0;
std::uint32_t ignore2; std::uint32_t ignore2;
}; };
@ -131,7 +122,12 @@ public:
void write_stream(const std::u16string &filename, const std::vector<std::uint8_t> &data); void write_stream(const std::u16string &filename, const std::vector<std::uint8_t> &data);
private: private:
compound_document_header &header(); std::size_t sector_size();
std::size_t short_sector_size();
std::size_t sector_data_start();
bool contains_entry(const std::u16string &path);
compound_document_entry &find_entry(const std::u16string &path);
std::vector<byte> read(sector_id start); std::vector<byte> read(sector_id start);
std::vector<byte> read_short(sector_id start); std::vector<byte> read_short(sector_id start);
@ -139,25 +135,33 @@ private:
void read_msat(); void read_msat();
void read_sat(); void read_sat();
void read_ssat(); void read_ssat();
void read_header();
void read_directory_tree();
void write(const std::vector<byte> &data, sector_id start); void write(const std::vector<byte> &data, sector_id start);
void write_short(const std::vector<byte> &data, sector_id start); void write_short(const std::vector<byte> &data, sector_id start);
compound_document_entry &insert_entry(const std::u16string &name); void write_msat();
compound_document_entry &find_entry(const std::u16string &name); void write_sat();
compound_document_entry &find_entry(directory_id id); void write_ssat();
bool contains_entry(const std::u16string &name); void write_header();
std::vector<directory_id> find_siblings(directory_id entry); void write_directory_tree();
std::vector<directory_id> children(directory_id entry);
sector_id allocate_sector(std::size_t count = 1); sector_id allocate_sectors(std::size_t sectors);
compound_document_entry &insert_entry(const std::u16string &path,
compound_document_entry::entry_type type);
std::unique_ptr<binary_reader> reader_; std::unique_ptr<binary_reader> reader_;
std::unique_ptr<binary_writer> writer_; std::unique_ptr<binary_writer> writer_;
compound_document_header header_;
sector_chain msat_; sector_chain msat_;
sector_chain sat_; sector_chain sat_;
sector_chain ssat_; sector_chain ssat_;
std::vector<compound_document_entry> entries_;
}; };
} // namespace detail } // namespace detail