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authorAnthony G. Basile <blueness@gentoo.org>2014-08-05 19:22:24 -0400
committerAnthony G. Basile <blueness@gentoo.org>2014-08-05 19:22:24 -0400
commitb1ac60946d1625e14029ea9b7fa3aa4c06e0795f (patch)
tree28cdd75fec8c6c6a2cf69c9668add048c10370f8 /src/shared/utf8.c
parent4b8733ffe9c0fe8e5a527186d323dab93e43fb37 (diff)
src/shared: refactor shared code
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Diffstat (limited to 'src/shared/utf8.c')
-rw-r--r--src/shared/utf8.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/src/shared/utf8.c b/src/shared/utf8.c
new file mode 100644
index 0000000000..1044fb6489
--- /dev/null
+++ b/src/shared/utf8.c
@@ -0,0 +1,249 @@
+/***
+ This file is part of udev, forked from systemd.
+
+ Copyright 2008-2011 Kay Sievers
+ Copyright 2012 Lennart Poettering
+
+ 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/>.
+***/
+
+/* Parts of this file are based on the GLIB utf8 validation functions. The
+ * original license text follows. */
+
+/* gutf8.c - Operations on UTF-8 strings.
+ *
+ * Copyright (C) 1999 Tom Tromey
+ * Copyright (C) 2000 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "utf8.h"
+#include "util.h"
+
+static inline bool is_unicode_valid(uint32_t ch) {
+
+ if (ch >= 0x110000) /* End of unicode space */
+ return false;
+ if ((ch & 0xFFFFF800) == 0xD800) /* Reserved area for UTF-16 */
+ return false;
+ if ((ch >= 0xFDD0) && (ch <= 0xFDEF)) /* Reserved */
+ return false;
+ if ((ch & 0xFFFE) == 0xFFFE) /* BOM (Byte Order Mark) */
+ return false;
+
+ return true;
+}
+
+static bool is_unicode_control(uint32_t ch) {
+
+ /*
+ 0 to ' '-1 is the C0 range.
+ DEL=0x7F, and DEL+1 to 0x9F is C1 range.
+ '\t' is in C0 range, but more or less harmless and commonly used.
+ */
+
+ return (ch < ' ' && ch != '\t' && ch != '\n') ||
+ (0x7F <= ch && ch <= 0x9F);
+}
+
+/* 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 */
+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;
+}
+
+bool utf8_is_printable(const char* str, size_t length) {
+ const uint8_t *p;
+
+ assert(str);
+
+ for (p = (const uint8_t*) str; length;) {
+ int encoded_len = utf8_encoded_valid_unichar((const char *)p);
+ int val = utf8_encoded_to_unichar((const char*)p);
+
+ if (encoded_len < 0 || val < 0 || is_unicode_control(val))
+ return false;
+
+ length -= encoded_len;
+ p += encoded_len;
+ }
+
+ return true;
+}
+
+char *ascii_is_valid(const char *str) {
+ const char *p;
+
+ assert(str);
+
+ for (p = str; *p; p++)
+ if ((unsigned char) *p >= 128)
+ return NULL;
+
+ return (char*) str;
+}
+
+char *utf16_to_utf8(const void *s, size_t length) {
+ char *r;
+ const uint8_t *f;
+ uint8_t *t;
+
+ r = new(char, (length*3+1)/2 + 1);
+ if (!r)
+ return NULL;
+
+ t = (uint8_t*) r;
+
+ for (f = s; f < (const uint8_t*) s + length; f += 2) {
+ uint16_t c;
+
+ c = (f[1] << 8) | f[0];
+
+ if (c == 0) {
+ *t = 0;
+ return r;
+ } else if (c < 0x80) {
+ *(t++) = (uint8_t) c;
+ } else if (c < 0x800) {
+ *(t++) = (uint8_t) (0xc0 | (c >> 6));
+ *(t++) = (uint8_t) (0x80 | (c & 0x3f));
+ } else {
+ *(t++) = (uint8_t) (0xe0 | (c >> 12));
+ *(t++) = (uint8_t) (0x80 | ((c >> 6) & 0x3f));
+ *(t++) = (uint8_t) (0x80 | (c & 0x3f));
+ }
+ }
+
+ *t = 0;
+
+ return r;
+}
+
+/* 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;
+}