Implemented file reader function

src/utils.c

@@ -2,9 +2,12 @@
 // Created by marcsello on 05/11/2020.
 //
 
+#include <stdio.h>
+
 #include "utils.h"
 
-bool contains(const uint8_t* data, uint64_t data_len, uint8_t what) {
+
+bool contains(const uint8_t *data, uint64_t data_len, uint8_t what) {
     for (uint64_t i = 0; i < data_len; i++) {
         if (data[i] == what) {
             return true;
@@ -12,3 +15,41 @@ bool contains(const uint8_t* data, uint64_t data_len, uint8_t what) {
     }
     return false;
 }
+
+uint8_t read_file_to_mem(mm_ctx context, const char *filename, uint64_t max_len, uint8_t **data, uint64_t *data_len) {
+    FILE *fp = fopen(filename, "rb");
+
+    if (fp == NULL) {
+        return FILE_READ_COULD_NOT_OPEN;
+    }
+
+    fseek(fp, 0L, SEEK_END);
+    uint64_t fsize = ftell(fp);
+
+    if (fsize > max_len) {
+        fclose(fp);
+        return FILE_READ_TOO_BIG;
+    }
+
+    fseek(fp, 0L, SEEK_SET);
+
+    uint8_t *contents = (uint8_t *) magic_malloc(context, fsize);
+
+    if (contents == NULL) {
+        fclose(fp);
+        return FILE_READ_COULD_NOT_ALLOCATE;
+    }
+
+    uint64_t bytes_read = fread(contents, 1, fsize, fp);
+
+    if (bytes_read != fsize) {
+        fclose(fp);
+        return FILE_READ_ERROR;
+    }
+
+    *data = contents;
+    *data_len = fsize;
+
+    fclose(fp);
+    return FILE_READ_SUCCESS;
+}