From bb1e3c973526e66024e1a3260255368034cb2008 Mon Sep 17 00:00:00 2001
From: Robin Watts <robin.watts@artifex.com>
Date: Thu, 2 Feb 2012 16:18:13 +0000
Subject: Support remote links in XPS documents.

Update xps path handling to cope with URLs.

Fix premature freeing of links.

Spot remote URLs and use appropriate link type.
---
 xps/xps_util.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 83 insertions(+), 14 deletions(-)

(limited to 'xps/xps_util.c')

diff --git a/xps/xps_util.c b/xps/xps_util.c
index 6af4da91..5a3b1fbf 100644
--- a/xps/xps_util.c
+++ b/xps/xps_util.c
@@ -20,15 +20,77 @@ xps_strcasecmp(char *a, char *b)
 	return xps_tolower(*a) - xps_tolower(*b);
 }
 
+/* A URL is defined as consisting of a:
+ * SCHEME (e.g. http:)
+ * AUTHORITY (username, password, hostname, port, eg //test:passwd@mupdf.com:999)
+ * PATH (e.g. /download)
+ * QUERY (e.g. ?view=page)
+ * FRAGMENT (e.g. #fred) (not strictly part of the URL)
+ */
+static char *
+skip_scheme(char *path)
+{
+	char *p = path;
+
+	/* Skip over: alpha *(alpha | digit | "+" | "-" | ".") looking for : */
+	if (*p >= 'a' && *p <= 'z')
+	{}
+	else if (*p >= 'A' && *p <= 'Z')
+	{}
+	else
+		return path;
+
+	while (*++p)
+	{
+		if (*p >= 'a' && *p <= 'z')
+		{}
+		else if (*p >= 'A' && *p <= 'Z')
+		{}
+		else if (*p >= '0' && *p <= '9')
+		{}
+		else if (*p == '+')
+		{}
+		else if (*p == '-')
+		{}
+		else if (*p == '.')
+		{}
+		else if (*p == ':')
+			return p+1;
+		else
+			break;
+	}
+	return path;
+}
+
+static char *
+skip_authority(char *path)
+{
+	char *p = path;
+
+	/* Authority section must start with '//' */
+	if (p[0] != '/' || p[1] != '/')
+		return path;
+	p += 2;
+
+	/* Authority is terminated by end of URL, '/' or '?' */
+	while (*p && *p != '/' && *p != '?')
+		p++;
+
+	return p;
+}
+
+
 #define SEP(x)	((x)=='/' || (x) == 0)
 
 static char *
 xps_clean_path(char *name)
 {
-	char *p, *q, *dotdot;
+	char *p, *q, *dotdot, *start;
 	int rooted;
 
-	rooted = name[0] == '/';
+	start = skip_scheme(name);
+	start = skip_authority(start);
+	rooted = start[0] == '/';
 
 	/*
 	 * invariants:
@@ -37,7 +99,7 @@ xps_clean_path(char *name)
 	 *		dotdot points just past the point where .. cannot backtrack
 	 *				any further (no slash).
 	 */
-	p = q = dotdot = name + rooted;
+	p = q = dotdot = start + rooted;
 	while (*p)
 	{
 		if(p[0] == '/') /* null element */
@@ -54,7 +116,7 @@ xps_clean_path(char *name)
 			}
 			else if (!rooted) /* /.. is / but ./../ is .. */
 			{
-				if (q != name)
+				if (q != start)
 					*q++ = '/';
 				*q++ = '.';
 				*q++ = '.';
@@ -63,36 +125,43 @@ xps_clean_path(char *name)
 		}
 		else /* real path element */
 		{
-			if (q != name+rooted)
+			if (q != start+rooted)
 				*q++ = '/';
 			while ((*q = *p) != '/' && *q != 0)
 				p++, q++;
 		}
 	}
 
-	if (q == name) /* empty string is really "." */
+	if (q == start) /* empty string is really "." */
 		*q++ = '.';
 	*q = '\0';
 
 	return name;
 }
 
-/* RJW: Possible problems here:
- * "/foo" + "../../bar" = "/bar" not "../bar"
- * "http://something/" + ... doesn't work.
- */
 void
-xps_absolute_path(char *output, char *base_uri, char *path, int output_size)
+xps_resolve_url(char *output, char *base_uri, char *path, int output_size)
 {
-	if (path[0] == '/')
+	char *p = skip_authority(skip_scheme(path));
+
+	if (p != path || path[0] == '/')
 	{
 		fz_strlcpy(output, path, output_size);
 	}
 	else
 	{
-		fz_strlcpy(output, base_uri, output_size);
-		fz_strlcat(output, "/", output_size);
+		int len = fz_strlcpy(output, base_uri, output_size);
+		if (len == 0 || output[len-1] != '/')
+			fz_strlcat(output, "/", output_size);
 		fz_strlcat(output, path, output_size);
 	}
 	xps_clean_path(output);
 }
+
+int
+xps_url_is_remote(char *path)
+{
+	char *p = skip_authority(skip_scheme(path));
+
+	return p != path;
+}
-- 
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