[evolution] Move gtkhtml data encoding/decoding to e-composer-private.c.

[Matthew Barnes <mbarnes src gnome org>]

commit 70b27af74ecaf38a1567ff1a7d483f7a65d7f2fe
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sat Dec 31 14:43:58 2011 -0500

    Move gtkhtml data encoding/decoding to e-composer-private.c.
    
    Simplify the algorithms, trading efficiency for readability.

 composer/e-composer-private.c |   81 ++++++++++++++++++++++++++++++++
 composer/e-composer-private.h |    2 +
 composer/e-msg-composer.c     |  103 ++--------------------------------------
 3 files changed, 89 insertions(+), 97 deletions(-)
---
diff --git a/composer/e-composer-private.c b/composer/e-composer-private.c
index a5282af..b35c84d 100644
--- a/composer/e-composer-private.c
+++ b/composer/e-composer-private.c
@@ -639,6 +639,87 @@ e_composer_get_default_charset (void)
 	return charset;
 }
 
+gchar *
+e_composer_decode_clue_value (const gchar *encoded_value)
+{
+	GString *buffer;
+	const gchar *cp;
+
+	/* Decode a GtkHtml "ClueFlow" value. */
+
+	g_return_val_if_fail (encoded_value != NULL, NULL);
+
+	buffer = g_string_sized_new (strlen (encoded_value));
+
+	/* Copy the value, decoding escaped characters as we go. */
+	cp = encoded_value;
+	while (*cp != '\0') {
+		if (*cp == '.') {
+			cp++;
+			switch (*cp) {
+				case '.':
+					g_string_append_c (buffer, '.');
+					break;
+				case '1':
+					g_string_append_c (buffer, '"');
+					break;
+				case '2':
+					g_string_append_c (buffer, '=');
+					break;
+				default:
+					/* Invalid escape sequence. */
+					g_string_free (buffer, TRUE);
+					return NULL;
+			}
+		} else
+			g_string_append_c (buffer, *cp);
+		cp++;
+	}
+
+	return g_string_free (buffer, FALSE);
+}
+
+gchar *
+e_composer_encode_clue_value (const gchar *decoded_value)
+{
+	gchar *encoded_value;
+	gchar **strv;
+
+	/* Encode a GtkHtml "ClueFlow" value. */
+
+	g_return_val_if_fail (decoded_value != NULL, NULL);
+
+	/* XXX This is inefficient but easy to understand. */
+
+	encoded_value = g_strdup (decoded_value);
+
+	/* Substitution: '.' --> '..' (do this first) */
+	if (strchr (encoded_value, '.') != NULL) {
+		strv = g_strsplit (encoded_value, ".", 0);
+		g_free (encoded_value);
+		encoded_value = g_strjoinv ("..", strv);
+		g_strfreev (strv);
+	}
+
+	/* Substitution: '"' --> '.1' */
+	if (strchr (encoded_value, '"') != NULL) {
+		strv = g_strsplit (encoded_value, """", 0);
+		g_free (encoded_value);
+		encoded_value = g_strjoinv (".1", strv);
+		g_strfreev (strv);
+	}
+
+	/* Substitution: '=' --> '.2' */
+	if (strchr (encoded_value, '=') != NULL) {
+		strv = g_strsplit (encoded_value, "=", 0);
+		g_free (encoded_value);
+		encoded_value = g_strjoinv (".2", strv);
+		g_strfreev (strv);
+	}
+
+	return encoded_value;
+}
+
 gboolean
 e_composer_paste_html (EMsgComposer *composer,
                        GtkClipboard *clipboard)
diff --git a/composer/e-composer-private.h b/composer/e-composer-private.h
index 3a3bf62..4282d57 100644
--- a/composer/e-composer-private.h
+++ b/composer/e-composer-private.h
@@ -128,6 +128,8 @@ void		e_composer_private_finalize	(EMsgComposer *composer);
 void		e_composer_actions_init		(EMsgComposer *composer);
 gchar *		e_composer_find_data_file	(const gchar *basename);
 gchar *		e_composer_get_default_charset	(void);
+gchar *		e_composer_decode_clue_value	(const gchar *encoded_value);
+gchar *		e_composer_encode_clue_value	(const gchar *decoded_value);
 gboolean	e_composer_paste_html		(EMsgComposer *composer,
 						 GtkClipboard *clipboard);
 gboolean	e_composer_paste_image		(EMsgComposer *composer,
diff --git a/composer/e-msg-composer.c b/composer/e-msg-composer.c
index 7ff8b48..a7250a7 100644
--- a/composer/e-msg-composer.c
+++ b/composer/e-msg-composer.c
@@ -1389,99 +1389,6 @@ composer_build_message_finish (EMsgComposer *composer,
 
 /* Signatures */
 
-static gchar *
-encode_signature_uid (ESignature *signature)
-{
-	const gchar *uid;
-	const gchar *s;
-	gchar *ename, *e;
-	gint len = 0;
-
-	uid = e_signature_get_uid (signature);
-
-	s = uid;
-	while (*s) {
-		len++;
-		if (*s == '"' || *s == '.' || *s == '=')
-			len++;
-		s++;
-	}
-
-	ename = g_new (gchar, len + 1);
-
-	s = uid;
-	e = ename;
-	while (*s) {
-		if (*s == '"') {
-			*e = '.';
-			e++;
-			*e = '1';
-			e++;
-		} else if (*s == '=') {
-			*e = '.';
-			e++;
-			*e = '2';
-			e++;
-		} else {
-			*e = *s;
-			e++;
-		}
-		if (*s == '.') {
-			*e = '.';
-			e++;
-		}
-		s++;
-	}
-	*e = 0;
-
-	return ename;
-}
-
-static gchar *
-decode_signature_name (const gchar *name)
-{
-	const gchar *s;
-	gchar *dname, *d;
-	gint len = 0;
-
-	s = name;
-	while (*s) {
-		len++;
-		if (*s == '.') {
-			s++;
-			if (!*s || !(*s == '.' || *s == '1' || *s == '2'))
-				return NULL;
-		}
-		s++;
-	}
-
-	dname = g_new (char, len + 1);
-
-	s = name;
-	d = dname;
-	while (*s) {
-		if (*s == '.') {
-			s++;
-			if (!*s || !(*s == '.' || *s == '1' || *s == '2')) {
-				g_free (dname);
-				return NULL;
-			}
-			if (*s == '1')
-				*d = '"';
-			else if (*s == '2')
-				*d = '=';
-			else
-				*d = '.';
-		} else
-			*d = *s;
-		d++;
-		s++;
-	}
-	*d = 0;
-
-	return dname;
-}
-
 static gboolean
 is_top_signature (EMsgComposer *composer)
 {
@@ -1600,8 +1507,10 @@ get_signature_html (EMsgComposer *composer)
 		const gchar *sig_delim = format_html ? "-- \n<BR>" : "-- \n";
 		const gchar *sig_delim_ent = format_html ? "\n-- \n<BR>" : "\n-- \n";
 
-		if (signature)
-			encoded_uid = encode_signature_uid (signature);
+		if (signature != NULL) {
+			const gchar *uid = e_signature_get_uid (signature);
+			encoded_uid = e_composer_encode_clue_value (uid);
+		}
 
 		/* The signature dash convention ("-- \n") is specified
 		 * in the "Son of RFC 1036", section 4.3.2.
@@ -3113,11 +3022,11 @@ set_signature_gui (EMsgComposer *composer)
 
 	data = gtkhtml_editor_get_paragraph_data (editor, "signature_name");
 	if (g_str_has_prefix (data, "uid:")) {
-		decoded = decode_signature_name (data + 4);
+		decoded = e_composer_decode_clue_value (data + 4);
 		signature = e_get_signature_by_uid (decoded);
 		g_free (decoded);
 	} else if (g_str_has_prefix (data, "name:")) {
-		decoded = decode_signature_name (data + 5);
+		decoded = e_composer_decode_clue_value (data + 5);
 		signature = e_get_signature_by_name (decoded);
 		g_free (decoded);
 	}