charset: reimplement is_supported_encoding to use iconv instead of mc built-in charset table

Signed-off-by: Yury V. Zaytsev <yury@shurup.com>

lib/charsets.c

@@ -267,17 +267,16 @@ get_codepage_index (const char *id)
 gboolean
 is_supported_encoding (const char *encoding)
 {
-    gboolean result = FALSE;
-    guint t;
+    GIConv coder;
+    gboolean result;
 
-    for (t = 0; t < codepages->len; t++)
-    {
-        const char *id;
-
-        id = ((codepage_desc *) g_ptr_array_index (codepages, t))->id;
-        result |= (g_ascii_strncasecmp (encoding, id, strlen (id)) == 0);
-    }
+    if (encoding == NULL)
+        return FALSE;
 
+    coder = str_crt_conv_from (encoding);
+    result = coder != INVALID_CONV;
+    if (result)
+        str_close_conv (coder);
     return result;
 }
 

lib/utilunix.c

@@ -920,10 +920,20 @@ canonicalize_pathname_custom (char *path, canon_path_flags_t flags)
                 {
                     /* "token/../foo" -> "foo" */
 #ifdef HAVE_CHARSET
-                    if ((strncmp (s, VFS_ENCODING_PREFIX, enc_prefix_len) == 0)
-                        && (is_supported_encoding (s + enc_prefix_len)))
-                        /* special case: remove encoding */
-                        str_move (s, p + 1);
+                    if (strncmp (s, VFS_ENCODING_PREFIX, enc_prefix_len) == 0)
+                    {
+                        char *enc;
+
+                        enc = vfs_get_encoding (s, -1);
+
+                        if (is_supported_encoding (enc))
+                            /* special case: remove encoding */
+                            str_move (s, p + 1);
+                        else
+                            str_move (s, p + 4);
+
+                        g_free (enc);
+                    }
                     else
 #endif /* HAVE_CHARSET */
                         str_move (s, p + 4);
@@ -947,9 +957,18 @@ canonicalize_pathname_custom (char *path, canon_path_flags_t flags)
                 if (s == lpath + 1)
                     s[0] = '\0';
 #ifdef HAVE_CHARSET
-                else if ((strncmp (s, VFS_ENCODING_PREFIX, enc_prefix_len) == 0)
-                         && (is_supported_encoding (s + enc_prefix_len)))
+                else if (strncmp (s, VFS_ENCODING_PREFIX, enc_prefix_len) == 0)
                 {
+                    char *enc;
+                    gboolean ok;
+
+                    enc = vfs_get_encoding (s, -1);
+                    ok = is_supported_encoding (enc);
+                    g_free (enc);
+
+                    if (!ok)
+                        goto last;
+
                     /* special case: remove encoding */
                     s[0] = '.';
                     s[1] = '.';
@@ -966,6 +985,7 @@ canonicalize_pathname_custom (char *path, canon_path_flags_t flags)
 #endif /* HAVE_CHARSET */
                 else
                 {
+                  last:
                     if (s >= lpath + url_delim_len
                         && strncmp (s - url_delim_len, VFS_PATH_URL_DELIMITER, url_delim_len) == 0)
                         *s = '\0';

lib/vfs/path.c

@@ -182,42 +182,6 @@ vfs_canon (const char *path)
     return result;
 }
 
-/* --------------------------------------------------------------------------------------------- */
-
-#ifdef HAVE_CHARSET
-/** get encoding after last #enc: or NULL, if part does not contain #enc:
- *
- * @param path null-terminated string
- * @param len the maximum length of path, where #enc: should be searched
- *
- * @return newly allocated string.
- */
-
-static char *
-vfs_get_encoding (const char *path, ssize_t len)
-{
-    char *semi;
-
-    /* try found #enc: */
-    semi = g_strrstr_len (path, len, VFS_ENCODING_PREFIX);
-    if (semi == NULL)
-        return NULL;
-
-    if (semi == path || IS_PATH_SEP (semi[-1]))
-    {
-        char *slash;
-
-        semi += strlen (VFS_ENCODING_PREFIX);   /* skip "#enc:" */
-        slash = strchr (semi, PATH_SEP);
-        if (slash != NULL)
-            return g_strndup (semi, slash - semi);
-        return g_strdup (semi);
-    }
-
-    return vfs_get_encoding (path, semi - path);
-}
-#endif
-
 /* --------------------------------------------------------------------------------------------- */
 /**  Extract the hostname and username from the path
  *
@@ -1071,6 +1035,39 @@ vfs_prefix_to_class (const char *prefix)
 
 #ifdef HAVE_CHARSET
 
+/** get encoding after last #enc: or NULL, if part does not contain #enc:
+ *
+ * @param path null-terminated string
+ * @param len the maximum length of path, where #enc: should be searched
+ *
+ * @return newly allocated string.
+ */
+
+char *
+vfs_get_encoding (const char *path, ssize_t len)
+{
+    char *semi;
+
+    /* try found #enc: */
+    semi = g_strrstr_len (path, len, VFS_ENCODING_PREFIX);
+    if (semi == NULL)
+        return NULL;
+
+    if (semi == path || IS_PATH_SEP (semi[-1]))
+    {
+        char *slash;
+
+        semi += strlen (VFS_ENCODING_PREFIX);   /* skip "#enc:" */
+        slash = strchr (semi, PATH_SEP);
+        if (slash != NULL)
+            return g_strndup (semi, slash - semi);
+        return g_strdup (semi);
+    }
+
+    return vfs_get_encoding (path, semi - path);
+}
+
+/* --------------------------------------------------------------------------------------------- */
 /**
  * Check if need cleanup charset converter for vfs_path_element_t
  *

lib/vfs/path.h

@@ -82,6 +82,7 @@ void vfs_path_element_free (vfs_path_element_t * element);
 struct vfs_class *vfs_prefix_to_class (const char *prefix);
 
 #ifdef HAVE_CHARSET
+char *vfs_get_encoding(const char *path, ssize_t len);
 gboolean vfs_path_element_need_cleanup_converter (const vfs_path_element_t * element);
 vfs_path_t *vfs_path_change_encoding (vfs_path_t * vpath, const char *encoding);
 #endif

tests/lib/vfs/vfs_get_encoding.c

@@ -27,7 +27,7 @@
 
 #include "tests/mctest.h"
 
-#include "lib/vfs/path.c"       /* for testing of static vfs_get_encoding() */
+#include "lib/vfs/path.h"
 
 /* --------------------------------------------------------------------------------------------- */