Add URL parsing routines

Create the new files url.h and url.c for parsing URL strings.
The new structure struct pb_url holds the results of the parse
operation.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

2 files changed, 248 insertions, 0 deletions

diff --git a/ui/common/url.c b/ui/common/url.c
new file mode 100644
index 0000000..0de0f58
--- /dev/null
+++ b/ui/common/url.c
@@ -0,0 +1,185 @@
+/*
+ *  Copyright (C) 2009 Sony Computer Entertainment Inc.
+ *  Copyright 2009 Sony Corp.
+ *
+ *  This program 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; version 2 of the License.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <string.h>
+
+#include "log/log.h"
+#include "talloc/talloc.h"
+#include "url.h"
+
+/**
+ * pb_scheme_info - Helper for parsing URLs.
+ */
+
+struct pb_scheme_info {
+	enum pb_url_scheme scheme;
+	const char *str;
+	unsigned int str_len;
+};
+
+/**
+ * pb_url_find_scheme - Find the pb_scheme_info for a URL string.
+ */
+
+static const struct pb_scheme_info *pb_url_find_scheme(const char *url_str)
+{
+	static const struct pb_scheme_info a[] = {
+	{
+		.scheme = pb_url_file,
+		.str = "file://",
+		.str_len = sizeof("file://") - 1,
+	},
+	{
+		.scheme = pb_url_ftp,
+		.str = "ftp://",
+		.str_len = sizeof("ftp://") - 1,
+	},
+	{
+		.scheme = pb_url_http,
+		.str = "http://",
+		.str_len = sizeof("http://") - 1,
+	},
+	{
+		.scheme = pb_url_https,
+		.str = "https://",
+		.str_len = sizeof("https://") - 1,
+	},
+	{
+		.scheme = pb_url_nfs,
+		.str = "nfs://",
+		.str_len = sizeof("nfs://") - 1,
+	},
+	{
+		.scheme = pb_url_sftp,
+		.str = "sftp://",
+		.str_len = sizeof("sftp://") - 1,
+	},
+	{
+		.scheme = pb_url_tftp,
+		.str = "tftp://",
+		.str_len = sizeof("tftp://") - 1,
+	},
+	};
+	static const struct pb_scheme_info file_scheme = {
+		.str = "",
+		.scheme = pb_url_file,
+	};
+	unsigned int i;
+
+	for (i = 0; i < sizeof(a) / sizeof(a[0]); i++)
+		if (!strncasecmp(url_str, a[i].str, a[i].str_len))
+			return &a[i];
+
+	/* Assume this is a non-url local file. */
+
+	return &file_scheme;
+}
+
+/**
+ * pb_url_parse - Parse a remote file URL.
+ * @ctx: The talloc context to associate with the returned string.
+ *
+ * Returns a talloc'ed struct pb_url instance on success, or NULL on error.
+ */
+
+struct pb_url *pb_url_parse(void *ctx, const char *url_str)
+{
+	const struct pb_scheme_info *si;
+	struct pb_url *url;
+	const char *p;
+
+	pb_log("%s: '%s'\n", __func__, url_str);
+
+	if (!url_str || !*url_str) {
+		assert(0 && "bad url");
+		return NULL;
+	}
+
+	url = talloc_zero(ctx, struct pb_url);
+
+	if (!url)
+		return NULL;
+
+	si = pb_url_find_scheme(url_str);
+
+	url->scheme = si->scheme;
+	p = url_str + si->str_len;
+
+	url->full = talloc_strdup(url, url_str);
+
+	if (url->scheme == pb_url_file) {
+		url->port = NULL;
+		url->host = NULL;
+		url->path = talloc_strdup(url, p);
+	} else {
+		int len;
+		const char *col;
+		const char *path;
+
+		path = strchr(p, '/');
+
+		if (!path) {
+			pb_log("%s: parse path failed '%s'\n", p);
+			goto fail;
+		}
+
+		col = strchr(p, ':');
+
+		if (col) {
+			len = path - col - 1;
+			url->port = len ? talloc_strndup(url, col + 1, len)
+				: NULL;
+			len = col - p;
+			url->host = len ? talloc_strndup(url, p, len) : NULL;
+		} else {
+			url->port = NULL;
+			url->host = talloc_strndup(url, p, path - p);
+		}
+		url->path = talloc_strdup(url, path);
+	}
+
+	p = strrchr(url->path, '/');
+
+	if (p) {
+		p++;
+		url->dir = talloc_strndup(url, url->path, p - url->path);
+		url->file = talloc_strdup(url, p);
+	} else {
+		url->dir = NULL;
+		url->file = talloc_strdup(url, url->path);
+	}
+
+	pb_log(" scheme %d\n", url->scheme);
+	pb_log(" host '%s'\n", url->host);
+	pb_log(" port '%s'\n", url->port);
+	pb_log(" path '%s'\n", url->path);
+	pb_log(" dir '%s'\n", url->dir);
+	pb_log(" file '%s'\n", url->file);
+
+	return url;
+
+fail:
+	talloc_free(url);
+	return NULL;
+}
diff --git a/ui/common/url.h b/ui/common/url.h
new file mode 100644
index 0000000..a966dc7
--- /dev/null
+++ b/ui/common/url.h
@@ -0,0 +1,63 @@
+/*
+ *  Copyright (C) 2009 Sony Computer Entertainment Inc.
+ *  Copyright 2009 Sony Corp.
+ *
+ *  This program 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; version 2 of the License.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if !defined(_PB_URL_PARSER_H)
+#define _PB_URL_PARSER_H
+
+/**
+ * enum pb_url_scheme - Enumeration of the URL schemes we can handle.
+ */
+
+enum pb_url_scheme {
+	pb_url_unknown = 0,
+	pb_url_file,
+	pb_url_ftp,
+	pb_url_http,
+	pb_url_https,
+	pb_url_nfs,
+	pb_url_sftp,
+	pb_url_tftp,
+};
+
+/**
+ * struct pb_url - Parsed URL info.
+ * @scheme: The enum pb_url_scheme for this URL.
+ * @full: The full URL = scheme://host:port/path.
+ * @host: The host part of URL.
+ * @port: The port part of URL.
+ * @path: The path part of URL.
+ * @dir: The dir part of path.
+ * @file: The file part of path.
+ *
+ * For info on URL syntax see:
+ *  http://www.ietf.org/rfc/rfc3986.txt
+ */
+
+struct pb_url {
+	enum pb_url_scheme scheme;
+	char *full;
+	char *host;
+	char *port;
+	char *path;
+	char *dir;
+	char *file;
+};
+
+struct pb_url *pb_url_parse(void *ctx, const char *url_str);
+
+#endif