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-rw-r--r--src/libudev/libudev-util.c171
-rw-r--r--src/shared/utf8.c151
-rw-r--r--src/shared/utf8.h4
-rw-r--r--src/test/test-utf8.c59
4 files changed, 217 insertions, 168 deletions
diff --git a/src/libudev/libudev-util.c b/src/libudev/libudev-util.c
index 714dc50ae9..d54430cad0 100644
--- a/src/libudev/libudev-util.c
+++ b/src/libudev/libudev-util.c
@@ -34,6 +34,7 @@
#include "libudev.h"
#include "libudev-private.h"
+#include "utf8.h"
/**
* SECTION:libudev-util
@@ -306,129 +307,6 @@ void util_remove_trailing_chars(char *path, char c)
path[--len] = '\0';
}
-/* count of characters used to encode one unicode char */
-static int utf8_encoded_expected_len(const char *str)
-{
- unsigned char c = (unsigned char)str[0];
-
- if (c < 0x80)
- return 1;
- if ((c & 0xe0) == 0xc0)
- return 2;
- if ((c & 0xf0) == 0xe0)
- return 3;
- if ((c & 0xf8) == 0xf0)
- return 4;
- if ((c & 0xfc) == 0xf8)
- return 5;
- if ((c & 0xfe) == 0xfc)
- return 6;
- return 0;
-}
-
-/* decode one unicode char */
-static int utf8_encoded_to_unichar(const char *str)
-{
- int unichar;
- int len;
- int i;
-
- len = utf8_encoded_expected_len(str);
- switch (len) {
- case 1:
- return (int)str[0];
- case 2:
- unichar = str[0] & 0x1f;
- break;
- case 3:
- unichar = (int)str[0] & 0x0f;
- break;
- case 4:
- unichar = (int)str[0] & 0x07;
- break;
- case 5:
- unichar = (int)str[0] & 0x03;
- break;
- case 6:
- unichar = (int)str[0] & 0x01;
- break;
- default:
- return -1;
- }
-
- for (i = 1; i < len; i++) {
- if (((int)str[i] & 0xc0) != 0x80)
- return -1;
- unichar <<= 6;
- unichar |= (int)str[i] & 0x3f;
- }
-
- return unichar;
-}
-
-/* expected size used to encode one unicode char */
-static int utf8_unichar_to_encoded_len(int unichar)
-{
- if (unichar < 0x80)
- return 1;
- if (unichar < 0x800)
- return 2;
- if (unichar < 0x10000)
- return 3;
- if (unichar < 0x200000)
- return 4;
- if (unichar < 0x4000000)
- return 5;
- return 6;
-}
-
-/* check if unicode char has a valid numeric range */
-static int utf8_unichar_valid_range(int unichar)
-{
- if (unichar > 0x10ffff)
- return 0;
- if ((unichar & 0xfffff800) == 0xd800)
- return 0;
- if ((unichar > 0xfdcf) && (unichar < 0xfdf0))
- return 0;
- if ((unichar & 0xffff) == 0xffff)
- return 0;
- return 1;
-}
-
-/* validate one encoded unicode char and return its length */
-static int utf8_encoded_valid_unichar(const char *str)
-{
- int len;
- int unichar;
- int i;
-
- len = utf8_encoded_expected_len(str);
- if (len == 0)
- return -1;
-
- /* ascii is valid */
- if (len == 1)
- return 1;
-
- /* check if expected encoded chars are available */
- for (i = 0; i < len; i++)
- if ((str[i] & 0x80) != 0x80)
- return -1;
-
- unichar = utf8_encoded_to_unichar(str);
-
- /* check if encoded length matches encoded value */
- if (utf8_unichar_to_encoded_len(unichar) != len)
- return -1;
-
- /* check if value has valid range */
- if (!utf8_unichar_valid_range(unichar))
- return -1;
-
- return len;
-}
-
int util_replace_whitespace(const char *str, char *to, size_t len)
{
size_t i, j;
@@ -457,17 +335,6 @@ int util_replace_whitespace(const char *str, char *to, size_t len)
return 0;
}
-static int is_whitelisted(char c, const char *white)
-{
- if ((c >= '0' && c <= '9') ||
- (c >= 'A' && c <= 'Z') ||
- (c >= 'a' && c <= 'z') ||
- strchr("#+-.:=@_", c) != NULL ||
- (white != NULL && strchr(white, c) != NULL))
- return 1;
- return 0;
-}
-
/* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */
int util_replace_chars(char *str, const char *white)
{
@@ -477,7 +344,7 @@ int util_replace_chars(char *str, const char *white)
while (str[i] != '\0') {
int len;
- if (is_whitelisted(str[i], white)) {
+ if (is_utf8_encoding_whitelisted(str[i], white)) {
i++;
continue;
}
@@ -525,39 +392,7 @@ int util_replace_chars(char *str, const char *white)
**/
_public_ int udev_util_encode_string(const char *str, char *str_enc, size_t len)
{
- size_t i, j;
-
- if (str == NULL || str_enc == NULL)
- return -1;
-
- for (i = 0, j = 0; str[i] != '\0'; i++) {
- int seqlen;
-
- seqlen = utf8_encoded_valid_unichar(&str[i]);
- if (seqlen > 1) {
- if (len-j < (size_t)seqlen)
- goto err;
- memcpy(&str_enc[j], &str[i], seqlen);
- j += seqlen;
- i += (seqlen-1);
- } else if (str[i] == '\\' || !is_whitelisted(str[i], NULL)) {
- if (len-j < 4)
- goto err;
- sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
- j += 4;
- } else {
- if (len-j < 1)
- goto err;
- str_enc[j] = str[i];
- j++;
- }
- }
- if (len-j < 1)
- goto err;
- str_enc[j] = '\0';
- return 0;
-err:
- return -1;
+ return udev_encode_string(str, str_enc, len);
}
/*
diff --git a/src/shared/utf8.c b/src/shared/utf8.c
index 655cc771d4..1a68394a53 100644
--- a/src/shared/utf8.c
+++ b/src/shared/utf8.c
@@ -317,3 +317,154 @@ char *utf16_to_utf8(const void *s, size_t length) {
return r;
}
+
+/* count of characters used to encode one unicode char */
+static int utf8_encoded_expected_len(const char *str) {
+ unsigned char c = (unsigned char)str[0];
+
+ if (c < 0x80)
+ return 1;
+ if ((c & 0xe0) == 0xc0)
+ return 2;
+ if ((c & 0xf0) == 0xe0)
+ return 3;
+ if ((c & 0xf8) == 0xf0)
+ return 4;
+ if ((c & 0xfc) == 0xf8)
+ return 5;
+ if ((c & 0xfe) == 0xfc)
+ return 6;
+ return 0;
+}
+
+/* decode one unicode char */
+static int utf8_encoded_to_unichar(const char *str) {
+ int unichar;
+ int len;
+ int i;
+
+ len = utf8_encoded_expected_len(str);
+ switch (len) {
+ case 1:
+ return (int)str[0];
+ case 2:
+ unichar = str[0] & 0x1f;
+ break;
+ case 3:
+ unichar = (int)str[0] & 0x0f;
+ break;
+ case 4:
+ unichar = (int)str[0] & 0x07;
+ break;
+ case 5:
+ unichar = (int)str[0] & 0x03;
+ break;
+ case 6:
+ unichar = (int)str[0] & 0x01;
+ break;
+ default:
+ return -1;
+ }
+
+ for (i = 1; i < len; i++) {
+ if (((int)str[i] & 0xc0) != 0x80)
+ return -1;
+ unichar <<= 6;
+ unichar |= (int)str[i] & 0x3f;
+ }
+
+ return unichar;
+}
+
+/* expected size used to encode one unicode char */
+static int utf8_unichar_to_encoded_len(int unichar) {
+ if (unichar < 0x80)
+ return 1;
+ if (unichar < 0x800)
+ return 2;
+ if (unichar < 0x10000)
+ return 3;
+ if (unichar < 0x200000)
+ return 4;
+ if (unichar < 0x4000000)
+ return 5;
+ return 6;
+}
+
+/* validate one encoded unicode char and return its length */
+int utf8_encoded_valid_unichar(const char *str) {
+ int len;
+ int unichar;
+ int i;
+
+ len = utf8_encoded_expected_len(str);
+ if (len == 0)
+ return -1;
+
+ /* ascii is valid */
+ if (len == 1)
+ return 1;
+
+ /* check if expected encoded chars are available */
+ for (i = 0; i < len; i++)
+ if ((str[i] & 0x80) != 0x80)
+ return -1;
+
+ unichar = utf8_encoded_to_unichar(str);
+
+ /* check if encoded length matches encoded value */
+ if (utf8_unichar_to_encoded_len(unichar) != len)
+ return -1;
+
+ /* check if value has valid range */
+ if (!is_unicode_valid(unichar))
+ return -1;
+
+ return len;
+}
+
+int is_utf8_encoding_whitelisted(char c, const char *white) {
+ if ((c >= '0' && c <= '9') ||
+ (c >= 'A' && c <= 'Z') ||
+ (c >= 'a' && c <= 'z') ||
+ strchr("#+-.:=@_", c) != NULL ||
+ (white != NULL && strchr(white, c) != NULL))
+ return 1;
+ return 0;
+}
+
+int udev_encode_string(const char *str, char *str_enc, size_t len) {
+ size_t i, j;
+
+ if (str == NULL || str_enc == NULL)
+ return -1;
+
+ for (i = 0, j = 0; str[i] != '\0'; i++) {
+ int seqlen;
+
+ seqlen = utf8_encoded_valid_unichar(&str[i]);
+ if (seqlen > 1) {
+ if (len-j < (size_t)seqlen)
+ goto err;
+ memcpy(&str_enc[j], &str[i], seqlen);
+ j += seqlen;
+ i += (seqlen-1);
+ } else if (str[i] == '\\' || !is_utf8_encoding_whitelisted(str[i], NULL)) {
+ if (len-j < 4)
+ goto err;
+ sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
+ j += 4;
+ } else {
+ if (len-j < 1)
+ goto err;
+ str_enc[j] = str[i];
+ j++;
+ }
+ }
+ if (len-j < 1)
+ goto err;
+ str_enc[j] = '\0';
+ return 0;
+err:
+ return -1;
+}
diff --git a/src/shared/utf8.h b/src/shared/utf8.h
index f805ea6b59..7a5608c9ee 100644
--- a/src/shared/utf8.h
+++ b/src/shared/utf8.h
@@ -34,3 +34,7 @@ char *utf8_filter(const char *s);
char *ascii_filter(const char *s);
char *utf16_to_utf8(const void *s, size_t length);
+
+int utf8_encoded_valid_unichar(const char *str);
+int is_utf8_encoding_whitelisted(char c, const char *white);
+int udev_encode_string(const char *str, char *str_enc, size_t len);
diff --git a/src/test/test-utf8.c b/src/test/test-utf8.c
new file mode 100644
index 0000000000..d2b9771f4b
--- /dev/null
+++ b/src/test/test-utf8.c
@@ -0,0 +1,59 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Dave Reisner
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+
+#include "utf8.h"
+#include "util.h"
+
+/* helpers for test_udev_encode_string */
+static char *do_encode_string(const char *in) {
+ size_t out_len = strlen(in) * 4;
+ char *out = malloc(out_len);
+
+ assert_se(out);
+ assert_se(udev_encode_string(in, out, out_len) >= 0);
+ puts(out);
+
+ return out;
+}
+
+static bool expect_encoded_as(const char *in, const char *expected) {
+ _cleanup_free_ char *encoded = do_encode_string(in);
+ return streq(encoded, expected);
+}
+
+static void test_udev_encode_string(void) {
+ assert_se(expect_encoded_as("systemd sucks", "systemd\\x20sucks"));
+ assert_se(expect_encoded_as("pinkiepie", "pinkiepie"));
+ assert_se(expect_encoded_as("valíd\\ųtf8", "valíd\\x5cųtf8"));
+ assert_se(expect_encoded_as("s/ash/ng", "s\\x2fash\\x2fng"));
+}
+
+static void test_utf8_is_valid(void) {
+ assert_se(utf8_is_valid("ascii is valid unicode"));
+ assert_se(utf8_is_valid("\341\204\242"));
+ assert_se(!utf8_is_valid("\341\204"));
+}
+
+int main(int argc, char *argv[]) {
+ test_utf8_is_valid();
+ test_udev_encode_string();
+}
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