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/*
* Copyright 2022-2025 Frederico de Oliveira Linhares
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "binary_reader.hpp"
#include <bit>
#include <fstream>
namespace
{
union IntAndFloat32bit{
UI32 i;
F32 f;
};
union IntAndFloat64bit{
UI64 i;
F64 f;
};
}
BinaryReader::BinaryReader(const std::string &file_path):
_pointer{0}
{
std::ifstream file(file_path, std::ios::binary | std::ios::ate);
if(!file.is_open())
{
std::string error{"failed to open file: "};
error += file_path;
throw std::runtime_error{error};
}
this->_size = file.tellg();
file.seekg(0);
this->data = new UI8[this->_size];
file.read((char*)data, this->_size);
}
BinaryReader::BinaryReader(const char *file_path):
BinaryReader{std::string(file_path)}
{
}
BinaryReader::~BinaryReader()
{
delete[] this->data;
}
UI8
BinaryReader::read_ui8()
{
return this->data[this->_pointer++];
}
UI32
BinaryReader::read_ui32()
{
UI8 b1{this->data[_pointer++]}, b2{this->data[_pointer++]},
b3{this->data[_pointer++]}, b4{this->data[_pointer++]};
return b1 << 24 | b2 << 16 | b3 << 8 | b4;
}
UI64
BinaryReader::read_ui64()
{
UI8 b1{this->data[_pointer++]}, b2{this->data[_pointer++]},
b3{this->data[_pointer++]}, b4{this->data[_pointer++]},
b5{this->data[_pointer++]}, b6{this->data[_pointer++]},
b7{this->data[_pointer++]}, b8{this->data[_pointer++]};
return (UI64)b1 << 56 | (UI64)b2 << 48 | (UI64)b3 << 40 |
(UI64)b4 << 32 | (UI64)b5 << 24 | (UI64)b6 << 16 |
(UI64)b7 << 8 | (UI64)b8;
}
I8
BinaryReader::read_i8()
{
return std::bit_cast<I8>(this->read_ui8());
}
I32
BinaryReader::read_i32()
{
return std::bit_cast<I32>(this->read_ui32());
}
I64
BinaryReader::read_i64()
{
return std::bit_cast<I64>(this->read_ui64());
}
F32
BinaryReader::read_f32()
{
IntAndFloat32bit num;
num.i = read_ui32();
return num.f;
}
F64
BinaryReader::read_f64()
{
IntAndFloat64bit num;
num.i = read_ui64();
return num.f;
}
glm::vec2
BinaryReader::read_vec2()
{
IntAndFloat32bit x{read_ui32()}, y{read_ui32()};
return glm::vec2{x.f, y.f};
}
glm::vec3
BinaryReader::read_vec3()
{
IntAndFloat32bit x{read_ui32()}, y{read_ui32()}, z{read_ui32()};
return glm::vec3{x.f, y.f, z.f};
}
glm::quat
BinaryReader::read_quat()
{
IntAndFloat32bit w{read_ui32()}, x{read_ui32()}, y{read_ui32()},
z{read_ui32()};
return glm::quat{w.f, x.f, y.f, z.f};
}
glm::mat4
BinaryReader::read_mat4()
{
glm::mat4 matrix;
float *offset_matrix_data{glm::value_ptr(matrix)};
for(int i{0}; i < 16; i++)
{
IntAndFloat32bit num;
num.i = read_ui32();
offset_matrix_data[i] = num.f;
}
return matrix;
}
void
BinaryReader::read_chars(char *str, int size)
{
for(int i{0}; i < size; i++)
str[i] = (char)data[this->_pointer++];
}
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