Added VFS driver and initramfs disk creator

fs_generator.c

@@ -0,0 +1,55 @@
+/* This program comes from James Molloy tutorial 
+ * on how to create an UNIX clone You can find the original code at:
+ * http://www.jamesmolloy.co.uk/tutorial_html/8.-The%20VFS%20and%20the%20initrd.html */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+struct initrd_header {
+    unsigned char magic; // Magic number for consistency
+    char name[64];
+    unsigned int offset; // Offset of the file start
+    unsigned int length;
+};
+
+int main(int argc, char **argv) {
+    int heads = (argc - 1) / 2;
+    struct initrd_header headers[64];
+    printf("Size of header(in bytes): %ld\n", sizeof(struct initrd_header));
+    unsigned int off = sizeof(struct initrd_header) * 64 + sizeof(int);
+    for(int i = 0; i < heads; i++) {
+        printf("Writing file %s->%s at 0x%d\n", argv[i*2+1], argv[i*2+2], off);
+        strcpy(headers[i].name, argv[i*2+2]);
+        headers[i].offset = off;
+        FILE *stream = fopen(argv[i*2+1], "r");
+        if(stream == 0) {
+            puts("Error, file not found!");
+            return 1;
+        }
+        fseek(stream, 0, SEEK_END);
+        headers[i].length = ftell(stream);
+        off += headers[i].length;
+        fclose(stream);
+        headers[i].magic = 0xBF;
+    }
+
+    FILE *wstream = fopen("./initrd.img", "w");
+    unsigned char *data = (unsigned char*)malloc(off);
+    fwrite(&heads, sizeof(int), 1, wstream);
+    fwrite(&heads, sizeof(struct initrd_header), 64, wstream);
+
+    for(int i = 0; i < heads; i++) {
+        FILE *stream = fopen(argv[i*2+1], "r");
+        unsigned char *buf = (unsigned char*)malloc(headers[i].length);
+        fread(buf, 1, headers[i].length, stream);
+        fread(buf, 1, headers[i].length, wstream);
+        fclose(stream);
+        free(buf);
+    }
+
+    fclose(wstream);
+    free(data);
+
+    return 0;
+}