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#ifndef OPENMW_ESM_COMMON_H
#define OPENMW_ESM_COMMON_H
#include <cassert>
#include <cstdint>
#include <cstring>
#include <filesystem>
#include <limits>
#include <string>
#include <string_view>
#include <type_traits>
#include <vector>
namespace ESM
{
enum RecordFlag
{
// This flag exists, but is not used to determine if a record has been deleted while loading
FLAG_Deleted = 0x00000020,
FLAG_Persistent = 0x00000400,
FLAG_Ignored = 0x00001000,
FLAG_Blocked = 0x00002000
};
using StringSizeType = std::uint32_t;
template <std::size_t capacity>
struct FixedString
{
static_assert(capacity > 0);
static constexpr std::size_t sCapacity = capacity;
char mData[capacity];
FixedString() = default;
template <std::size_t size>
constexpr FixedString(const char (&value)[size]) noexcept
: mData()
{
if constexpr (capacity == sizeof(std::uint32_t))
{
static_assert(capacity == size || capacity + 1 == size);
if constexpr (capacity + 1 == size)
assert(value[capacity] == '\0');
for (std::size_t i = 0; i < capacity; ++i)
mData[i] = value[i];
}
else
{
const std::size_t length = std::min(capacity, size);
for (std::size_t i = 0; i < length; ++i)
mData[i] = value[i];
mData[std::min(capacity - 1, length)] = '\0';
}
}
constexpr explicit FixedString(std::uint32_t value) noexcept
: mData()
{
static_assert(capacity == sizeof(std::uint32_t));
for (std::size_t i = 0; i < capacity; ++i)
mData[i] = static_cast<char>((value >> (i * std::numeric_limits<std::uint8_t>::digits))
& std::numeric_limits<std::uint8_t>::max());
}
template <class T>
constexpr explicit FixedString(T value) noexcept
: FixedString(static_cast<std::uint32_t>(value))
{
}
std::string_view toStringView() const noexcept { return std::string_view(mData, strnlen(mData, capacity)); }
std::string toString() const { return std::string(toStringView()); }
std::uint32_t toInt() const noexcept
{
static_assert(capacity == sizeof(std::uint32_t));
std::uint32_t value;
std::memcpy(&value, mData, capacity);
return value;
}
void clear() noexcept { std::memset(mData, 0, capacity); }
void assign(std::string_view value) noexcept
{
if (value.empty())
{
clear();
return;
}
if (value.size() < capacity)
{
if constexpr (capacity == sizeof(std::uint32_t))
std::memset(mData, 0, capacity);
std::memcpy(mData, value.data(), value.size());
if constexpr (capacity != sizeof(std::uint32_t))
mData[value.size()] = '\0';
return;
}
std::memcpy(mData, value.data(), capacity);
if constexpr (capacity != sizeof(std::uint32_t))
mData[capacity - 1] = '\0';
}
FixedString& operator=(std::uint32_t value) noexcept
{
static_assert(capacity == sizeof(value));
std::memcpy(&mData, &value, capacity);
return *this;
}
};
template <std::size_t capacity>
inline bool operator==(const FixedString<capacity>& lhs, std::string_view rhs) noexcept
{
for (std::size_t i = 0, n = std::min(rhs.size(), capacity); i < n; ++i)
{
if (lhs.mData[i] != rhs[i])
return false;
if (lhs.mData[i] == '\0')
return true;
}
return rhs.size() <= capacity || rhs[capacity] == '\0';
}
template <std::size_t capacity, class T, typename = std::enable_if_t<std::is_same_v<T, char>>>
inline bool operator==(const FixedString<capacity>& lhs, const T* const& rhs) noexcept
{
return lhs == std::string_view(rhs, capacity);
}
template <std::size_t capacity, std::size_t rhsSize>
inline bool operator==(const FixedString<capacity>& lhs, const char (&rhs)[rhsSize]) noexcept
{
return strnlen(rhs, rhsSize) == strnlen(lhs.mData, capacity) && std::strncmp(lhs.mData, rhs, capacity) == 0;
}
inline bool operator==(const FixedString<4>& lhs, std::uint32_t rhs) noexcept
{
return lhs.toInt() == rhs;
}
inline bool operator==(const FixedString<4>& lhs, const FixedString<4>& rhs) noexcept
{
return lhs.toInt() == rhs.toInt();
}
template <class T, typename = std::enable_if_t<std::is_same_v<T, char>>>
inline bool operator==(const FixedString<4>& lhs, const T* const& rhs) noexcept
{
return lhs == std::string_view(rhs, 5);
}
template <std::size_t capacity, class Rhs>
inline bool operator!=(const FixedString<capacity>& lhs, const Rhs& rhs) noexcept
{
return !(lhs == rhs);
}
using NAME = FixedString<4>;
using NAME32 = FixedString<32>;
using NAME64 = FixedString<64>;
static_assert(std::is_standard_layout_v<NAME> && std::is_trivial_v<NAME>);
static_assert(std::is_standard_layout_v<NAME32> && std::is_trivial_v<NAME32>);
static_assert(std::is_standard_layout_v<NAME64> && std::is_trivial_v<NAME64>);
static_assert(sizeof(NAME) == 4);
static_assert(sizeof(NAME32) == 32);
static_assert(sizeof(NAME64) == 64);
/* This struct defines a file 'context' which can be saved and later
restored by an ESMReader instance. It will save the position within
a file, and when restored will let you read from that position as
if you never left it.
*/
struct ESM_Context
{
std::filesystem::path filename;
std::streamsize leftRec;
std::uint32_t leftSub;
std::streamsize leftFile;
NAME recName, subName;
// When working with multiple esX files, we will generate lists of all files that
// actually contribute to a specific cell. Therefore, we need to store the index
// of the file belonging to this contest. See CellStore::(list/load)refs for details.
int index;
std::vector<int> parentFileIndices;
// True if subName has been read but not used.
bool subCached;
// File position. Only used for stored contexts, not regularly
// updated within the reader itself.
size_t filePos;
};
}
#endif
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