From: Jo-Philipp Wich <jo@mein.io>
Date: Thu, 7 Dec 2017 10:40:21 +0000 (+0100)
Subject: file_util: implement urlencode_path() helper
X-Git-Url: http://git.openwrt.org/?p=project%2Fopkg-lede.git;a=commitdiff_plain;h=73e6c815a0813c143723b27c255f6a1190beb2a0

file_util: implement urlencode_path() helper

Introduce a helper function urlencode_path() which can be used to encode
problematic characters in package file names.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Tested-by: Rafał Miłecki <rafal@milecki.pl>
---

diff --git a/libopkg/file_util.c b/libopkg/file_util.c
index 1f89541..14ca02e 100644
--- a/libopkg/file_util.c
+++ b/libopkg/file_util.c
@@ -346,3 +346,63 @@ int rm_r(const char *path)
 
 	return ret;
 }
+
+static int urlencode_is_specialchar(char c)
+{
+	switch (c) {
+	case ':':
+	case '?':
+	case '#':
+	case '[':
+	case ']':
+	case '@':
+	case '!':
+	case '$':
+	case '&':
+	case '\'':
+	case '(':
+	case ')':
+	case '*':
+	case '+':
+	case ',':
+	case ';':
+	case '=':
+	case '%':
+		return 1;
+
+	default:
+		return 0;
+	}
+}
+
+char *urlencode_path(const char *filename)
+{
+	static const char bin2hex[16] = {
+		'0', '1', '2', '3',
+		'4', '5', '6', '7',
+		'8', '9', 'a', 'b',
+		'c', 'd', 'e', 'f'
+	};
+
+	size_t len = 0;
+	const char *in;
+	char *copy, *out;
+
+	for (in = filename; *in != 0; in++)
+		len += urlencode_is_specialchar(*in) ? 3 : 1;
+
+	copy = xcalloc(1, len + 1);
+
+	for (in = filename, out = copy; *in != 0; in++) {
+		if (urlencode_is_specialchar(*in)) {
+			*out++ = '%';
+			*out++ = bin2hex[*in / 16];
+			*out++ = bin2hex[*in % 16];
+		}
+		else {
+			*out++ = *in;
+		}
+	}
+
+	return copy;
+}
diff --git a/libopkg/file_util.h b/libopkg/file_util.h
index d8e6767..e078f41 100644
--- a/libopkg/file_util.h
+++ b/libopkg/file_util.h
@@ -31,4 +31,6 @@ int rm_r(const char *path);
 char *checksum_bin2hex(const char *src, size_t len);
 char *checksum_hex2bin(const char *src, size_t *len);
 
+char *urlencode_path(const char *filename);
+
 #endif