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/// Functions used to read raw binary data from .nif files
#ifndef OPENMW_COMPONENTS_NIF_NIFSTREAM_HPP
#define OPENMW_COMPONENTS_NIF_NIFSTREAM_HPP
#include <array>
#include <cassert>
#include <istream>
#include <stdexcept>
#include <stdint.h>
#include <string>
#include <type_traits>
#include <vector>
#include <components/files/istreamptr.hpp>
#include <components/misc/endianness.hpp>
#include <components/misc/float16.hpp>
#include <osg/BoundingSphere>
#include <osg/Quat>
#include <osg/Vec3f>
#include <osg/Vec4f>
#include "niftypes.hpp"
namespace ToUTF8
{
class StatelessUtf8Encoder;
}
namespace Nif
{
class Reader;
template <std::size_t numInstances, typename T>
inline void readBufferOfType(Files::IStreamPtr& pIStream, T* dest)
{
static_assert(
std::is_arithmetic_v<T> || std::is_same_v<T, Misc::float16_t>, "Buffer element type is not arithmetic");
static_assert(!std::is_same_v<T, bool>, "Buffer element type is boolean");
pIStream->read((char*)dest, numInstances * sizeof(T));
if (pIStream->bad())
throw std::runtime_error("Failed to read typed (" + std::string(typeid(T).name()) + ") buffer of "
+ std::to_string(numInstances) + " instances");
if constexpr (Misc::IS_BIG_ENDIAN)
for (std::size_t i = 0; i < numInstances; i++)
Misc::swapEndiannessInplace(dest[i]);
}
template <std::size_t numInstances, typename T>
inline void readBufferOfType(Files::IStreamPtr& pIStream, T (&dest)[numInstances])
{
readBufferOfType<numInstances>(pIStream, static_cast<T*>(dest));
}
template <typename T>
inline void readDynamicBufferOfType(Files::IStreamPtr& pIStream, T* dest, std::size_t numInstances)
{
static_assert(
std::is_arithmetic_v<T> || std::is_same_v<T, Misc::float16_t>, "Buffer element type is not arithmetic");
static_assert(!std::is_same_v<T, bool>, "Buffer element type is boolean");
pIStream->read((char*)dest, numInstances * sizeof(T));
if (pIStream->bad())
throw std::runtime_error("Failed to read typed (" + std::string(typeid(T).name()) + ") dynamic buffer of "
+ std::to_string(numInstances) + " instances");
if constexpr (Misc::IS_BIG_ENDIAN)
for (std::size_t i = 0; i < numInstances; i++)
Misc::swapEndiannessInplace(dest[i]);
}
class NIFStream
{
const Reader& mReader;
Files::IStreamPtr mStream;
const ToUTF8::StatelessUtf8Encoder* mEncoder;
std::string mBuffer;
public:
explicit NIFStream(
const Reader& reader, Files::IStreamPtr&& stream, const ToUTF8::StatelessUtf8Encoder* encoder)
: mReader(reader)
, mStream(std::move(stream))
, mEncoder(encoder)
{
}
const Reader& getFile() const { return mReader; }
unsigned int getVersion() const;
unsigned int getUserVersion() const;
unsigned int getBethVersion() const;
/// Convert human-readable version numbers into a number that can be compared.
static constexpr uint32_t generateVersion(uint8_t major, uint8_t minor, uint8_t patch, uint8_t rev)
{
return (major << 24) + (minor << 16) + (patch << 8) + rev;
}
void skip(size_t size) { mStream->ignore(size); }
/// Read into a single instance of type
template <class T>
void read(T& data)
{
readBufferOfType<1>(mStream, &data);
}
/// Read multiple instances of type into an array
template <class T, size_t size>
void readArray(std::array<T, size>& arr)
{
readBufferOfType<size>(mStream, arr.data());
}
/// Read instances of type into a dynamic buffer
template <class T>
void read(T* dest, size_t size)
{
readDynamicBufferOfType<T>(mStream, dest, size);
}
/// Read multiple instances of type into a vector
template <class T>
void readVector(std::vector<T>& vec, size_t size)
{
if (size == 0)
return;
vec.resize(size);
read(vec.data(), size);
}
/// Extract an instance of type
template <class T>
T get()
{
T data;
read(data);
return data;
}
/// Read a string of the given length
std::string getSizedString(size_t length);
/// Read a string of the length specified in the file
std::string getSizedString() { return getSizedString(get<uint32_t>()); }
/// Read a list of strings without using the string table, e.g. the string table itself
void getSizedStrings(std::vector<std::string>& vec, size_t size);
/// Read a Bethesda header string that uses a byte for length
std::string getExportString() { return getSizedString(get<uint8_t>()); }
/// Read the version string which doesn't start with a number and ends with "\n"
std::string getVersionString();
/// Read a sequence of null-terminated strings
std::string getStringPalette();
};
template <>
void NIFStream::read<osg::Vec2f>(osg::Vec2f& vec);
template <>
void NIFStream::read<osg::Vec3f>(osg::Vec3f& vec);
template <>
void NIFStream::read<osg::Vec4f>(osg::Vec4f& vec);
template <>
void NIFStream::read<Matrix3>(Matrix3& mat);
template <>
void NIFStream::read<osg::Quat>(osg::Quat& quat);
template <>
void NIFStream::read<osg::BoundingSpheref>(osg::BoundingSpheref& sphere);
template <>
void NIFStream::read<NiTransform>(NiTransform& transform);
template <>
void NIFStream::read<NiQuatTransform>(NiQuatTransform& transform);
template <>
void NIFStream::read<bool>(bool& data);
template <>
void NIFStream::read<std::string>(std::string& str);
template <>
void NIFStream::read<osg::Vec2f>(osg::Vec2f* dest, size_t size);
template <>
void NIFStream::read<osg::Vec3f>(osg::Vec3f* dest, size_t size);
template <>
void NIFStream::read<osg::Vec4f>(osg::Vec4f* dest, size_t size);
template <>
void NIFStream::read<Matrix3>(Matrix3* dest, size_t size);
template <>
void NIFStream::read<osg::Quat>(osg::Quat* dest, size_t size);
template <>
void NIFStream::read<osg::BoundingSpheref>(osg::BoundingSpheref* dest, size_t size);
template <>
void NIFStream::read<NiTransform>(NiTransform* dest, size_t size);
template <>
void NIFStream::read<NiQuatTransform>(NiQuatTransform* dest, size_t size);
template <>
void NIFStream::read<bool>(bool* dest, size_t size);
template <>
void NIFStream::read<std::string>(std::string* dest, size_t size);
}
#endif
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