add file modification, file extension, read file

Utils/FileUtils.h

@@ -11,6 +11,11 @@
 #define UTILS_FILE_UTILS_H
 
 #ifdef _WIN32
+    #include <windows.h>
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include <wchar.h>
+
     #ifdef _MSC_VER
         #include <io.h>
     #else
@@ -41,6 +46,76 @@ namespace Utils {
                     return stat(filename, &buffer) == 0;
                 #endif
             }
+
+            static inline
+            time_t last_modification (char *filename)
+            {
+                #ifdef _WIN32
+                    FILETIME modtime;
+                    HANDLE h;
+
+                    h = CreateFileW(filename, GENERIC_READ | FILE_WRITE_ATTRIBUTES, 0, NULL, OPEN_EXISTING, 0, NULL);
+                    if (h == INVALID_HANDLE_VALUE) {
+                        return (time_t) 0;
+                    }
+
+                    if (GetFileTime(h, NULL, NULL, &modtime) == 0) {
+                        return (time_t) 0;
+                    }
+
+                    unsinged long long seconds = modtime.dwHighDateTime << 32;
+                    seconds |= modtime.dwLowDateTime;
+
+                    return (seconds - 116444736000000000) / 10000000;
+                #elif defined __linux__
+                    struct stat buffer;
+                    stat(filename, &buffer);
+
+                    (time_t) buffer.st_mtim.tv_sec;
+                #endif
+            }
+
+            char* file_extension (char *filename)
+            {
+                char *dot = strrchr(filename, '.');
+
+                if (!dot || dot == filename) {
+                    return "";
+                }
+
+                return dot + 1;
+            }
+
+            typedef struct {
+                char *content;
+                int size;
+            } file_body;
+
+            static inline
+            file_body read_file (char *filename)
+            {
+                file_body file = {0};
+
+                FILE *fp = fopen(filename, "rb");
+                if (!fp) {
+                    return NULL;
+                }
+
+                fseek(fp, 0, SEEK_END);
+                file.size = ftell(fp);
+                fseek(fp, 0, SEEK_SET);
+
+                file.content = malloc(file.size);
+                if (!file.content) {
+                    fprintf(stderr, "CRITICAL: malloc failed");
+                }
+
+                fread(file.content, file.size, 1, fp);
+
+                fclose(fp);
+
+                return file;
+            }
     };
 }