From c59c838696bd4927c91b52e8c4b6cbb1da77a368 Mon Sep 17 00:00:00 2001
From: AfonsoCMSousa <afonsoclerigomendessousa@gmail.com>
Date: Fri, 13 Jun 2025 13:23:20 +0100
Subject: [PATCH] File opperations to parse OBJ files into Matrixs.

---
 README.md                 |  6 +--
 include/io/io_file_op.cpp | 96 ++++++++++++++++++++++++++++++++++++++-
 include/io/io_file_op.hpp | 15 ++++++
 source/main.cpp           | 13 ++++++
 4 files changed, 126 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 9b6921b..e1b031c 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # CPP-Renderer
 
-A lightweight CPU-based raytracer written in modern C++.
-Features support for basic lighting, reflections, and shadows using ray-sphere intersections.
-Renders to .ppm images — no dependencies, just math.
+A lightweight CPU-based raytracer written in modern C++.
+Features support for basic lighting, reflections, and shadows using ray-sphere intersections.
+Renders to .ppm images — no dependencies, just math.
 Built from scratch for fun, learning, and low-level flexin’.
\ No newline at end of file
diff --git a/include/io/io_file_op.cpp b/include/io/io_file_op.cpp
index 6a2df98..f7e1edc 100644
--- a/include/io/io_file_op.cpp
+++ b/include/io/io_file_op.cpp
@@ -1 +1,95 @@
-#include "io_file_op.hpp"
\ No newline at end of file
+#include "io_file_op.hpp"
+#include <string.h>
+
+FILE *w_open_file(const char *filepath)
+{
+    if (filepath == nullptr)
+    {
+        return nullptr;
+    }
+    FILE *file = fopen(filepath, "rwb");
+    return file;
+}
+
+file_content w_read_file(FILE *file)
+{
+    file_content __result = init_file_content();
+
+    if (file == nullptr)
+    {
+        fprintf(stderr, "Error: Invalid file in w_read_file\n");
+        return __result;
+    }
+
+    fseek(file, 0, SEEK_END);
+    long file_size = ftell(file);
+    if (file_size < 0)
+    {
+        fprintf(stderr, "Error: Could not determine file size.\n");
+        return init_file_content();
+    }
+    rewind(file);
+
+    size_t size = (size_t)file_size;
+    char *buffer = (char *)malloc(sizeof(char) * (size + 1));
+    if (buffer == NULL)
+    {
+        fprintf(stderr, "Error: Cant Allocate buffer to read.\n");
+        return init_file_content();
+    }
+
+    size_t result = fread(buffer, 1, size, file);
+    if (result != size)
+    {
+        fprintf(stderr, "Error: Reading error in w_read_file.\n");
+        free(buffer);
+        return init_file_content();
+    }
+    buffer[size] = '\0';
+
+    size_t line_start = 0;
+    char **lines = NULL;
+
+    for (size_t i = 0; i <= size; i++)
+    {
+        if (buffer[i] == '\n' || buffer[i] == '\0')
+        {
+            size_t line_length = i - line_start;
+            char *line = (char *)malloc(line_length + 1);
+            if (line == NULL)
+            {
+                for (int j = 0; j < __result.num_lines; j++)
+                    free(lines[j]);
+                free(lines);
+                free(buffer);
+                fprintf(stderr, "Error: Cant Allocate line buffer.\n");
+                return init_file_content();
+            }
+            memcpy(line, &buffer[line_start], line_length);
+            line[line_length] = '\0';
+            char **new_lines = (char **)realloc(lines, ((size_t)(__result.num_lines + 1)) * sizeof(char *));
+            if (new_lines == NULL)
+            {
+                for (int j = 0; j < __result.num_lines; j++)
+                    free(lines[j]);
+                free(line);
+                free(lines);
+                free(buffer);
+                fprintf(stderr, "Error: Cant realloc lines array.\n");
+                return init_file_content();
+            }
+            lines = new_lines;
+            lines[__result.num_lines++] = line;
+            line_start = i + 1;
+        }
+    }
+    return __result;
+}
+
+file_content init_file_content()
+{
+    file_content r;
+    r.lines = NULL;
+    r.num_lines = 0;
+    return r;
+}
\ No newline at end of file
diff --git a/include/io/io_file_op.hpp b/include/io/io_file_op.hpp
index bcfd437..fc240a1 100644
--- a/include/io/io_file_op.hpp
+++ b/include/io/io_file_op.hpp
@@ -1,4 +1,19 @@
 #ifndef IO_FILE_OP_HPP
 #define IO_FILE_OP_HPP
 
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef struct
+{
+    char **lines;
+    int num_lines;
+} file_content;
+
+FILE *w_open_file(const char *filepath);
+file_content w_read_file(FILE *file);
+
+file_content init_file_content();
+
 #endif // !IO_FILE_OP_HPP
\ No newline at end of file
diff --git a/source/main.cpp b/source/main.cpp
index a6c8864..f77af87 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -2,9 +2,22 @@
 
 // Include the vector utilities header file
 #include "vector/vec_utils.hpp"
+#include "io/io_file_op.hpp"
 
 int main()
 {
+    file_content file_info = w_read_file(w_open_file("./CUBE.obj"));
 
+    for (size_t i = 0; i < (u_int32_t)file_info.num_lines; i++)
+    {
+        printf("Line %04zu: \t", i);
+        for (size_t j = 0; file_info.lines[i][j] != '\0'; j++)
+        {
+            printf("%c", file_info.lines[i][j]);
+        }
+        printf("\n");
+    }
+
+    free(file_info.lines);
     return 0;
 }
\ No newline at end of file