| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of 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 */ |
| 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; |
| } |
| |
| bool utf8_is_printable(const char* str, size_t length) { |
| const uint8_t *p; |
| |
| assert(str); |
| |
| for (p = (const uint8_t*) str; length; p++) { |
| int encoded_len = utf8_encoded_valid_unichar((const char *)p); |
| int32_t val = utf8_encoded_to_unichar((const char*)p); |
| |
| if (encoded_len < 0 || val < 0 || is_unicode_control(val)) |
| return false; |
| |
| length -= encoded_len; |
| } |
| |
| return true; |
| } |
| |
| const char *utf8_is_valid(const char *str) { |
| const uint8_t *p; |
| |
| assert(str); |
| |
| for (p = (const uint8_t*) str; *p; ) { |
| int len = utf8_encoded_valid_unichar((const char *)p); |
| |
| if (len < 0) |
| return NULL; |
| |
| p += len; |
| } |
| |
| return str; |
| } |
| |
| 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 *ascii_filter(const char *str) { |
| const char *s; |
| char *r, *d; |
| size_t l; |
| |
| assert(str); |
| |
| l = strlen(str); |
| r = malloc(l + 1); |
| if (!r) |
| return NULL; |
| |
| for (s = str, d = r; *s; s++) |
| if ((unsigned char) *s < 128) |
| *(d++) = *s; |
| |
| *d = 0; |
| |
| return r; |
| } |
| |
| 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; |
| } |