/*** 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; } /* 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; } const char *utf8_is_valid(const char *str) { const uint8_t *p; assert(str); for (p = (const uint8_t*) str; *p; ) { int len; len = utf8_encoded_valid_unichar((const char *)p); if (len < 0) return NULL; p += len; } return str; } /* 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; }