From 2c44fa54fb88b658b1ca96028a1e4cbbf3429871 Mon Sep 17 00:00:00 2001
From: Raquezin <fergicu@gmail.com>
Date: Sun, 16 Nov 2025 22:59:05 +0100
Subject: [PATCH] save and load matrix functions

---
 include/errores.h |  3 ++-
 include/matrix.h  | 21 +++++++++++++++++++++
 src/matrix.c      | 30 ++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/include/errores.h b/include/errores.h
index 6d88336..ad2a19f 100644
--- a/include/errores.h
+++ b/include/errores.h
@@ -8,7 +8,8 @@ typedef enum {
     ERR_INF_SOL,
     ERR_NO_SOL,
     ERR_NOT_INVERTIBLE,
-    ERR_DIV_BY_ZERO
+    ERR_DIV_BY_ZERO,
+    ERR_FILE_NOT_FOUND
 } ErrorCode;
 
 #endif // ERRORES_H
\ No newline at end of file
diff --git a/include/matrix.h b/include/matrix.h
index 1aca80b..412b823 100644
--- a/include/matrix.h
+++ b/include/matrix.h
@@ -1,6 +1,8 @@
 #ifndef MATRIX_H
 #define MATRIX_H
 
+#include "errores.h"
+
 #define REGISTRY_CAPACITY 100
 
 /**
@@ -46,4 +48,23 @@ Matrix create_matrix(const int rows, const int cols, const float val);
  */
 void free_registry();
 
+/**
+ * @brief Save a matrix to a binary file.
+ *
+ * @param a The matrix to save.
+ * @param filename Name of the file.
+ * @return Error code indicating the result of the operation.
+ */
+ErrorCode save_matrix(const Matrix a, const char *filename);
+
+/**
+ * @brief Load a matrix from a binary file.
+ *
+ * @param filename Name of the file.
+ * @param err Pointer to store the error code.
+ * @return The loaded matrix, or a default matrix in case of error.
+ */
+Matrix load_matrix(const char *filename, ErrorCode *err);
+
+
 #endif // MATRIX_H
\ No newline at end of file
diff --git a/src/matrix.c b/src/matrix.c
index 3d4d34e..e7df269 100644
--- a/src/matrix.c
+++ b/src/matrix.c
@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include "matrix.h"
 #include "operations_utils.h"
+#include "errores.h"
 
 static MatrixRegistry registry = {.index = 0};
 static Matrix default_matrix = {.row = 0, .col = 0, .data = NULL};
@@ -34,3 +35,32 @@ void free_registry() {
         free(registry.data[i]);
     }
 }
+
+ErrorCode save_matrix(const Matrix a, const char* filename) {
+    FILE* f = fopen(filename, "wb");
+    if (!f) return ERR_FILE_NOT_FOUND; 
+
+    fwrite(&a.row, sizeof(int), 1, f);
+    fwrite(&a.col, sizeof(int), 1, f);
+    fwrite(a.data, sizeof(float), a.row * a.col, f);
+
+    fclose(f);
+    return ERR_NONE;
+}
+
+Matrix load_matrix(const char* filename, ErrorCode* err) {
+    FILE* f = fopen(filename, "rb");
+    if (!f) {
+        *err = ERR_NONE; 
+        return default_matrix;
+    }
+
+    int rows, cols;
+    fread(&rows, sizeof(int), 1, f);
+    fread(&cols, sizeof(int), 1, f);
+    Matrix m = create_matrix(rows, cols, 0.0f);
+    fread(m.data, sizeof(float), rows * cols, f);
+    fclose(f);
+    *err = ERR_NONE;
+    return m;
+}