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#include "nifstream.hpp"
#include <span>
#include "niffile.hpp"
#include "../to_utf8/to_utf8.hpp"
namespace
{
// Read a range of elements into a dynamic buffer per-element
// This one should be used if the type cannot be read contiguously
// (e.g. quaternions)
template <class T>
void readRange(Nif::NIFStream& stream, T* dest, size_t size)
{
for (T& value : std::span(dest, size))
stream.read(value);
}
// Read a range of elements into a dynamic buffer
// This one should be used if the type can be read contiguously as an array of a different type
// (e.g. osg::VecXf can be read as a float array of X elements)
template <class elementType, size_t numElements, class T>
void readAlignedRange(Files::IStreamPtr& stream, T* dest, size_t size)
{
static_assert(std::is_standard_layout_v<T>);
static_assert(std::alignment_of_v<T> == std::alignment_of_v<elementType>);
static_assert(sizeof(T) == sizeof(elementType) * numElements);
Nif::readDynamicBufferOfType(stream, reinterpret_cast<elementType*>(dest), size * numElements);
}
}
namespace Nif
{
unsigned int NIFStream::getVersion() const
{
return mReader.getVersion();
}
unsigned int NIFStream::getUserVersion() const
{
return mReader.getUserVersion();
}
unsigned int NIFStream::getBethVersion() const
{
return mReader.getBethVersion();
}
std::string NIFStream::getSizedString(size_t length)
{
std::string str(length, '\0');
mStream->read(str.data(), length);
if (mStream->bad())
throw std::runtime_error("Failed to read sized string of " + std::to_string(length) + " chars");
size_t end = str.find('\0');
if (end != std::string::npos)
str.erase(end);
if (mEncoder)
str = mEncoder->getUtf8(str, ToUTF8::BufferAllocationPolicy::UseGrowFactor, mBuffer);
return str;
}
void NIFStream::getSizedStrings(std::vector<std::string>& vec, size_t size)
{
vec.resize(size);
for (size_t i = 0; i < vec.size(); i++)
vec[i] = getSizedString();
}
std::string NIFStream::getVersionString()
{
std::string result;
std::getline(*mStream, result);
if (mStream->bad())
throw std::runtime_error("Failed to read version string");
return result;
}
std::string NIFStream::getStringPalette()
{
size_t size = get<uint32_t>();
std::string str(size, '\0');
mStream->read(str.data(), size);
if (mStream->bad())
throw std::runtime_error("Failed to read string palette of " + std::to_string(size) + " chars");
return str;
}
template <>
void NIFStream::read<osg::Vec2f>(osg::Vec2f& vec)
{
readBufferOfType(mStream, vec._v);
}
template <>
void NIFStream::read<osg::Vec3f>(osg::Vec3f& vec)
{
readBufferOfType(mStream, vec._v);
}
template <>
void NIFStream::read<osg::Vec4f>(osg::Vec4f& vec)
{
readBufferOfType(mStream, vec._v);
}
template <>
void NIFStream::read<Matrix3>(Matrix3& mat)
{
readBufferOfType<9>(mStream, reinterpret_cast<float*>(&mat.mValues));
}
template <>
void NIFStream::read<osg::Quat>(osg::Quat& quat)
{
std::array<float, 4> data;
readArray(data);
quat.w() = data[0];
quat.x() = data[1];
quat.y() = data[2];
quat.z() = data[3];
}
template <>
void NIFStream::read<osg::BoundingSpheref>(osg::BoundingSpheref& sphere)
{
read(sphere.center());
read(sphere.radius());
}
template <>
void NIFStream::read<NiTransform>(NiTransform& transform)
{
read(transform.mRotation);
read(transform.mTranslation);
read(transform.mScale);
}
template <>
void NIFStream::read<NiQuatTransform>(NiQuatTransform& transform)
{
read(transform.mTranslation);
read(transform.mRotation);
read(transform.mScale);
if (getVersion() >= generateVersion(10, 1, 0, 110))
return;
if (!get<bool>())
transform.mTranslation = osg::Vec3f();
if (!get<bool>())
transform.mRotation = osg::Quat();
if (!get<bool>())
transform.mScale = 1.f;
}
template <>
void NIFStream::read<bool>(bool& data)
{
if (getVersion() < generateVersion(4, 1, 0, 0))
data = get<int32_t>() != 0;
else
data = get<int8_t>() != 0;
}
template <>
void NIFStream::read<std::string>(std::string& str)
{
if (getVersion() < generateVersion(20, 1, 0, 1))
str = getSizedString();
else
str = mReader.getString(get<uint32_t>());
}
template <>
void NIFStream::read<osg::Vec2f>(osg::Vec2f* dest, size_t size)
{
readAlignedRange<float, 2>(mStream, dest, size);
}
template <>
void NIFStream::read<osg::Vec3f>(osg::Vec3f* dest, size_t size)
{
readAlignedRange<float, 3>(mStream, dest, size);
}
template <>
void NIFStream::read<osg::Vec4f>(osg::Vec4f* dest, size_t size)
{
readAlignedRange<float, 4>(mStream, dest, size);
}
template <>
void NIFStream::read<Matrix3>(Matrix3* dest, size_t size)
{
readAlignedRange<float, 9>(mStream, dest, size);
}
template <>
void NIFStream::read<osg::Quat>(osg::Quat* dest, size_t size)
{
readRange(*this, dest, size);
}
template <>
void NIFStream::read<osg::BoundingSpheref>(osg::BoundingSpheref* dest, size_t size)
{
readRange(*this, dest, size);
}
template <>
void NIFStream::read<NiTransform>(NiTransform* dest, size_t size)
{
readRange(*this, dest, size);
}
template <>
void NIFStream::read<NiQuatTransform>(NiQuatTransform* dest, size_t size)
{
readRange(*this, dest, size);
}
template <>
void NIFStream::read<bool>(bool* dest, size_t size)
{
if (getVersion() < generateVersion(4, 1, 0, 0))
{
std::vector<int32_t> buf(size);
read(buf.data(), size);
for (size_t i = 0; i < size; ++i)
dest[i] = buf[i] != 0;
}
else
{
std::vector<int8_t> buf(size);
read(buf.data(), size);
for (size_t i = 0; i < size; ++i)
dest[i] = buf[i] != 0;
}
}
template <>
void NIFStream::read<std::string>(std::string* dest, size_t size)
{
if (getVersion() < generateVersion(20, 1, 0, 1))
{
for (std::string& value : std::span(dest, size))
value = getSizedString();
}
else
{
for (std::string& value : std::span(dest, size))
value = mReader.getString(get<uint32_t>());
}
}
}
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