--- a/src/core/ngx_string.c
+++ b/src/core/ngx_string.c
@@ -63,6 +63,46 @@ ngx_int_t ngx_atoi(u_char *line, size_t 
 
     if (value < 0) {
         return NGX_ERROR;
+
+    } else {
+        return value;
+    }
+}
+
+
+ngx_int_t ngx_hextoi(u_char *line, size_t n)
+{
+    u_char     ch;
+    ngx_int_t  value;
+
+    if (n == 0) {
+        return NGX_ERROR;
+    }
+
+    for (value = 0; n--; line++) {
+        ch = *line;
+
+        if (ch >= '0' && ch <= '9') {
+            value = value * 16 + (ch - '0');
+            continue;
+        }
+
+        if (ch >= 'A' && ch <= 'F') {
+            value = value * 16 + (*line - 'A');
+            continue;
+        }
+
+        if (ch >= 'a' && ch <= 'f') {
+            value = value * 16 + (*line - 'a');
+            continue;
+        }
+
+        return NGX_ERROR;
+    }
+
+    if (value < 0) {
+        return NGX_ERROR;
+
     } else {
         return value;
     }

--- a/src/core/ngx_string.h
+++ b/src/core/ngx_string.h
@@ -65,7 +65,9 @@ typedef struct {
 
 u_char *ngx_cpystrn(u_char *dst, u_char *src, size_t n);
 ngx_int_t ngx_rstrncmp(u_char *s1, u_char *s2, size_t n);
+
 ngx_int_t ngx_atoi(u_char *line, size_t n);
+ngx_int_t ngx_hextoi(u_char *line, size_t n);
 
 void ngx_md5_text(u_char *text, u_char *md5);
 

--- a/src/http/modules/ngx_http_charset_filter.c
+++ b/src/http/modules/ngx_http_charset_filter.c
@@ -5,11 +5,29 @@
 
 
 typedef struct {
+    ngx_str_t   from;
+    ngx_str_t   to;
+    char       *table;
+} ngx_http_charset_table_t;
+
+
+typedef struct {
+    ngx_array_t  tables;                 /* ngx_http_charset_table_t */
+} ngx_http_charset_main_conf_t;
+
+
+typedef struct {
     ngx_str_t  default_charset;
 } ngx_http_charset_loc_conf_t;
 
 
+static char *ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd,
+                                   void *conf);
+static char *ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf);
+
 static int ngx_http_charset_filter_init(ngx_cycle_t *cycle);
+
+static void *ngx_http_charset_create_main_conf(ngx_conf_t *cf);
 static void *ngx_http_charset_create_loc_conf(ngx_conf_t *cf);
 static char *ngx_http_charset_merge_loc_conf(ngx_conf_t *cf,
                                              void *parent, void *child);
@@ -17,21 +35,28 @@ static char *ngx_http_charset_merge_loc_
 
 static ngx_command_t  ngx_http_charset_filter_commands[] = {
 
-    {ngx_string("default_charset"),
-     NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
-     ngx_conf_set_str_slot,
-     NGX_HTTP_LOC_CONF_OFFSET,
-     offsetof(ngx_http_charset_loc_conf_t, default_charset),
-     NULL},
+    { ngx_string("charset_map"),
+      NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2,
+      ngx_charset_map_block,
+      NGX_HTTP_MAIN_CONF_OFFSET,
+      0,
+      NULL },
 
-    ngx_null_command
+    { ngx_string("default_charset"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_str_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_charset_loc_conf_t, default_charset),
+      NULL },
+
+      ngx_null_command
 };
 
 
 static ngx_http_module_t  ngx_http_charset_filter_module_ctx = {
     NULL,                                  /* pre conf */
 
-    NULL,                                  /* create main configuration */
+    ngx_http_charset_create_main_conf,     /* create main configuration */
     NULL,                                  /* init main configuration */
 
     NULL,                                  /* create server configuration */
@@ -106,6 +131,58 @@ static int ngx_http_charset_body_filter(
 #endif
 
 
+static char *ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd,
+                                   void *conf)
+{
+    char        *rv;
+    ngx_conf_t   pcf;
+
+    pcf = *cf;
+    cf->handler = ngx_charset_map;
+    cf->handler_conf = conf;
+    rv = ngx_conf_parse(cf, NULL);
+    *cf = pcf;
+
+    return rv;
+}
+
+
+static char *ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
+{
+    ngx_http_charset_main_conf_t  *mcf = conf;
+
+    ngx_int_t   src, dst;
+    ngx_str_t  *args;
+
+    if (cf->args->nelts != 2) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameters number");
+        return NGX_CONF_ERROR;
+    }
+
+    args = cf->args->elts;
+
+    src = ngx_hextoi(args[0].data, args[0].len);
+    if (src == NGX_ERROR || src > 255) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "invalid value \"%s\"", args[0].data);
+        return NGX_CONF_ERROR;
+    }
+
+    dst = ngx_hextoi(args[1].data, args[1].len);
+    if (dst == NGX_ERROR || dst > 255) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "invalid value \"%s\"", args[1].data);
+        return NGX_CONF_ERROR;
+    }
+
+#if 0
+    mcf->tables[src] = dst;
+#endif
+
+    return NGX_CONF_OK;
+}
+
+
 static int ngx_http_charset_filter_init(ngx_cycle_t *cycle)
 {
     ngx_http_next_header_filter = ngx_http_top_header_filter;
@@ -120,6 +197,21 @@ static int ngx_http_charset_filter_init(
 }
 
 
+static void *ngx_http_charset_create_main_conf(ngx_conf_t *cf)
+{
+    ngx_http_charset_main_conf_t  *mcf;
+
+    ngx_test_null(mcf,
+                  ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_main_conf_t)),
+                  NGX_CONF_ERROR);
+
+    ngx_init_array(mcf->tables, cf->pool, 10, sizeof(ngx_http_charset_table_t),
+                   NGX_CONF_ERROR);
+
+    return mcf;
+}
+
+
 static void *ngx_http_charset_create_loc_conf(ngx_conf_t *cf)
 {
     ngx_http_charset_loc_conf_t  *lcf;