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+;;; emms-url.el --- Make URL and EMMS work together well
+
+;; Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+
+;; This file is part of EMMS.
+
+;; EMMS is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; EMMS is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with EMMS; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; These routines sanify input to URL and parse data returned by URL.
+
+;;; Code:
+
+(require 'url)
+(require 'emms-compat)
+
+(defvar emms-url-specials-entire
+  '((?\  . "%20")
+    (?\n . "%0D%0A"))
+  "*An alist of characters which must be represented specially in URLs.
+The transformation is the key of the pair.
+
+This is used by `emms-url-quote-entire'.")
+
+(defun emms-url-quote-entire (url)
+  "Escape specials conservatively in an entire URL.
+
+The specials to escape are specified by the `emms-url-specials-entire'
+variable.
+
+If you want to escape parts of URLs thoroughly, then use
+`emms-url-quote' instead."
+  (apply (function concat)
+         (mapcar
+          (lambda (ch)
+            (let ((repl (assoc ch emms-url-specials-entire)))
+              (if (null repl)
+                  (char-to-string ch)
+                (cdr repl))))
+          (append url nil))))
+
+(defun emms-url-quote (s &optional safe)
+  "Replace special characters in S using the `%xx' escape.
+This is useful for escaping parts of URLs, but not entire URLs.
+
+Characters in [a-zA-Z_.-/] and SAFE(default is \"\") will never be
+quoted.
+e.g.,
+    (emms-url-quote \"abc def\") => \"abc%20def\"."
+  (if (not (stringp s))
+      ""
+    (or safe (setq safe ""))
+    (save-match-data
+      (let ((re (if (string-match "]" safe)
+                    ;; `]' should be placed at the beginning inside []
+                    (format "[]a-zA-Z_.-/%s]"
+                            (emms-replace-regexp-in-string "]" "" safe))
+                  (format "[a-zA-Z_.-/%s]" safe))))
+        (mapconcat
+         (lambda (c)
+           (let ((s1 (char-to-string c)))
+             (if (string-match re s1)
+                 s1
+               (format "%%%02x" c))))
+         (string-to-list (encode-coding-string s 'utf-8))
+         "")))))
+
+(defun emms-url-quote-plus (s &optional safe)
+  "Run (emms-url-quote s \" \"), then replace ` ' with `+'."
+  (emms-replace-regexp-in-string
+   " " "+" (emms-url-quote s (concat safe " "))))
+
+(defun emms-url-quote-underscore (s &optional safe)
+  "Run (emms-url-quote s \" \"), then replace ` ' with `_'."
+  (emms-replace-regexp-in-string
+   " " "_" (emms-url-quote s (concat safe " "))))
+
+(defun emms-http-content-coding ()
+  (save-match-data
+    (and (boundp 'url-http-content-type)
+         (stringp url-http-content-type)
+         (string-match ";\\s-*charset=\\([^;[:space:]]+\\)"
+                       url-http-content-type)
+         (intern-soft (downcase (match-string 1 url-http-content-type))))))
+
+(defun emms-http-decode-buffer (&optional buffer)
+  "Recode the buffer with `url-retrieve's contents. Else the
+buffer would contain multibyte chars like \\123\\456."
+  (with-current-buffer (or buffer (current-buffer))
+    (let* ((default (or (car default-process-coding-system) 'utf-8))
+           (coding  (or (emms-http-content-coding) default)))
+      (when coding
+        ;; (pop-to-buffer (current-buffer))
+        ;; (message "content-type: %s" url-http-content-type)
+        ;; (message "coding: %S [default: %S]" coding default)
+        (set-buffer-multibyte t)
+        (decode-coding-region (point-min) (point-max) coding)))))
+
+(provide 'emms-url)
+;;; emms-url.el ends here