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/*
* Copyright 2022 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 "pgm_image.h"
#include <cstring>
#include <charconv>
#include <fstream>
#include <string>
SDL_bool PGMImage_constructor(PGMImage *self, const char *file_path)
{
self->data = nullptr;
int wh_pos;
std::string line;
std::ifstream file(file_path);
if(!file)
{
self->error = "Failed to open PGM file";
return SDL_FALSE;
}
// Read file magic.
std::getline(file, line);
if(line != "P5")
{
self->error = "PGM file contains a invalid magic";
return SDL_FALSE;
}
// Read file comment.
std::getline(file, line);
// Read file width and height.
std::getline(file, line);
wh_pos = line.find(" ");
std::from_chars(line.data(), line.data() + wh_pos, self->width);
std::from_chars(
line.data() + wh_pos + 1, line.data() + line.size(), self->height);
// Read file maximum value.
std::getline(file, line);
std::from_chars(line.data(), line.data() + line.size(), self->max_value);
// Read file values.
self->data_size = self->width * self->height;
self->data = new char[self->data_size];
file.read(self->data, self->data_size);
return SDL_TRUE;
}
void PGMImage_destructor(PGMImage *self)
{
if(self->data != nullptr) delete[] self->data;
}
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