Add set_encode_hex_dash for set-misc

README.markdown

@@ -32,6 +32,7 @@ Table of Contents
     * [set_encode_base64](#set_encode_base64)
     * [set_decode_base64](#set_decode_base64)
     * [set_encode_hex](#set_encode_hex)
+    * [set_encode_hex_dash](#set_encode_hex_dash)
     * [set_decode_hex](#set_decode_hex)
     * [set_sha1](#set_sha1)
     * [set_md5](#set_md5)
@@ -714,6 +715,41 @@ then request `GET /test` will give exactly the same output as the previous examp
 
 This directive can be invoked by [lua-nginx-module](http://github.com/openresty/lua-nginx-module)'s [ndk.set_var.DIRECTIVE](http://github.com/openresty/lua-nginx-module#ndkset_vardirective) interface and [array-var-nginx-module](http://github.com/openresty/array-var-nginx-module)'s [array_map_op](http://github.com/openresty/array-var-nginx-module#array_map_op) directive.
 
+
+[Back to TOC](#table-of-contents)
+
+set_encode_hex_dash
+-----------------
+**syntax:** *set_encode_hex_dash $dst <src>*
+
+**syntax:** *set_encode_hex_dash $dst*
+
+**default:** *no*
+
+**context:** *location, location if*
+
+**phase:** *rewrite*
+
+**category:** *ndk_set_var_value*
+
+```nginx
+
+ location /test {
+     set $raw "章亦春";
+     set_encode_hex $digest $raw;
+     set_encode_hex_dash $digest_dashed $digest;
+
+     echo $digest_dashed;
+ }
+```
+
+Then request `GET /test` will yield the following output
+
+
+    \xe7\xab\xa0\xe4\xba\xa6\xe6\x98\xa5
+
+
+
 [Back to TOC](#table-of-contents)
 
 set_decode_hex

src/ngx_http_set_hex.c

@@ -7,6 +7,40 @@
 #include "ngx_http_set_hex.h"
 
 
+ngx_int_t
+ngx_http_set_misc_set_encode_hex_dash(ngx_http_request_t *r, ngx_str_t *res,
+    ngx_http_variable_value_t *v)
+{
+
+    u_char      *p;
+    ngx_uint_t   i;
+    size_t       len;
+
+    if (v->len % 2 != 0) {
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                      "set_encode_hex_dash: invalid value");
+        return NGX_ERROR;
+    }
+
+    p = v->data;
+    len = v->len << 1;
+
+    res->data = ngx_palloc(r->pool, len);
+    if (res->data == NULL) {
+        return NGX_ERROR;
+    }
+
+    for (i = 0; i < len; i=i+2) {
+        res->data[(i*2)+0] = (u_char) 92;
+        res->data[(i*2)+1] = (u_char) 120;
+        res->data[(i*2)+2] = p[i];
+        res->data[(i*2)+3] = p[i+1];
+    }
+
+    res->len = len;
+    return NGX_OK;
+}
+
 ngx_int_t
 ngx_http_set_misc_set_decode_hex(ngx_http_request_t *r, ngx_str_t *res,
     ngx_http_variable_value_t *v)
@@ -47,7 +81,6 @@ ngx_http_set_misc_set_decode_hex(ngx_http_request_t *r, ngx_str_t *res,
     return NGX_OK;
 }
 
-
 ngx_int_t
 ngx_http_set_misc_set_encode_hex(ngx_http_request_t *r, ngx_str_t *res,
     ngx_http_variable_value_t *v)

src/ngx_http_set_hex.h

@@ -2,6 +2,9 @@
 #include <ngx_config.h>
 #include <ngx_http.h>
 
+ngx_int_t ngx_http_set_misc_set_encode_hex_dash(ngx_http_request_t *r,
+        ngx_str_t *res, ngx_http_variable_value_t *v);
+
 ngx_int_t ngx_http_set_misc_set_decode_hex(ngx_http_request_t *r,
         ngx_str_t *res, ngx_http_variable_value_t *v);
 

src/ngx_http_set_misc_module.c

@@ -54,6 +54,12 @@ static ndk_set_var_t  ngx_http_set_misc_set_decode_base64_filter = {
     NULL
 };
 
+static ndk_set_var_t  ngx_http_set_misc_set_encode_hex_dash_filter = {
+    NDK_SET_VAR_VALUE,
+    (void *) ngx_http_set_misc_set_encode_hex_dash,
+    1,
+    NULL
+};
 
 static ndk_set_var_t  ngx_http_set_misc_set_decode_hex_filter = {
     NDK_SET_VAR_VALUE,
@@ -222,6 +228,14 @@ static ngx_command_t  ngx_http_set_misc_commands[] = {
         0,
         &ngx_http_set_misc_set_decode_base64_filter
     },
+    {   ngx_string ("set_encode_hex_dash"),
+        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF
+            |NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE12,
+        ndk_set_var_value,
+        0,
+        0,
+        &ngx_http_set_misc_set_encode_hex_dash_filter
+    },
     {   ngx_string ("set_decode_hex"),
         NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF
             |NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE12,