diff --git a/src/jairee.c b/src/jairee.c
new file mode 100644
index 0000000..d6f8ff5
--- /dev/null
+++ b/src/jairee.c
@@ -0,0 +1,65 @@
+#include "jairee.h"
+#include <string.h>
+#include <stdbool.h>
+
+#define NODE_TYPE_ACCEPT_ONE    0u
+#define NODE_TYPE_ACCEPT_RANGE  1u
+
+typedef struct {
+    jairee_cp_t cp1;
+    jairee_cp_t cp2;
+    size_t type;
+} node_t;
+
+bool jairee_compile_add_cp(jairee_re_t * re, jairee_cp_t cp)
+{
+}
+
+jairee_re_t * jairee_compile(jairee_string_t * rs)
+{
+    jairee_re_t * re = (jairee_re_t *)malloc(sizeof(jairee_re_t));
+    re->error = 0u;
+
+    size_t offset = 0u;
+    while (offset < rs->len)
+    {
+        jairee_cp_t cp = rs->decode(rs->str, &offset);
+        if (cp == JAIREE_DECODE_ERROR)
+        {
+            re->error |= JAIREE_ERR_DECODE;
+            break;
+        }
+        if (!jairee_compile_add_cp(re, cp))
+        {
+            break;
+        }
+    }
+
+    return re;
+}
+
+void jairee_free_re(jairee_re_t * re)
+{
+    free(re);
+}
+
+static jairee_cp_t decode_ascii(const void * s, size_t * offset)
+{
+    jairee_cp_t cp = (jairee_cp_t)((const char *)s)[*offset];
+    (*offset)++;
+    return cp;
+}
+
+jairee_string_t * jairee_string_from_asciiz(const char * s)
+{
+    jairee_string_t * js = (jairee_string_t *)malloc(sizeof(jairee_string_t));
+    js->str = s;
+    js->len = strlen(s);
+    js->decode = decode_ascii;
+    return js;
+}
+
+void jairee_free_string(jairee_string_t * str)
+{
+    free(str);
+}
diff --git a/src/jairee.h b/src/jairee.h
index c2d185a..5ee3cbe 100644
--- a/src/jairee.h
+++ b/src/jairee.h
@@ -4,11 +4,14 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define JAIREE_DECODE_ERROR 0xFEFEFEFFu
+#define JAIREE_DECODE_ERROR 0xFEFEFE00u
+
+#define JAIREE_ERR_DECODE   0x1u
+#define JAIREE_ERR_COMPILE  0x2u
 
 typedef uint32_t jairee_cp_t;
 
-typedef jairee_cp_t (*jairee_decode_t)(void * str, size_t offset);
+typedef jairee_cp_t (*jairee_decode_t)(const void * str, size_t * offset);
 
 typedef struct jairee_match_s {
     size_t start;
@@ -17,13 +20,13 @@ typedef struct jairee_match_s {
 } jairee_match_t;
 
 typedef struct {
-    void * str;
+    const void * str;
     size_t len;
     jairee_decode_t decode;
 } jairee_string_t;
 
 typedef struct {
-    size_t todo;
+    size_t error;
 } jairee_re_t;
 
 typedef struct {
@@ -32,6 +35,9 @@ typedef struct {
 
 jairee_re_t * jairee_compile(jairee_string_t * exp);
 
+void jairee_free_re(jairee_re_t * re);
+
+#if 0
 jairee_match_t * jairee_match(jairee_string_t * str, size_t start_offset, jairee_string_t * exp);
 
 jairee_match_t * jairee_matchc(jairee_string_t * str, size_t start_offset, jairee_re_t * re);
@@ -41,5 +47,10 @@ jairee_state_t * jairee_start(jairee_string_t * str, size_t start_offset, jairee
 jairee_state_t * jairee_startc(jairee_string_t * str, size_t start_offset, jairee_re_t * re, jairee_match_t ** match);
 
 jairee_status_t jairee_step(jairee_state_t * state, size_t timeout);
+#endif
+
+jairee_string_t * jairee_string_from_asciiz(const char * s);
+
+void jairee_free_string(jairee_string_t * str);
 
 #endif