1 files changed, 70 insertions, 0 deletions
diff --git a/src/pgm_image.cpp b/src/pgm_image.cpp
new file mode 100644
index 0000000..a88455c
--- /dev/null
+++ b/src/pgm_image.cpp
@@ -0,0 +1,70 @@
+/*
+ * 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;
+}