+++ /dev/null
-/*-*- 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"
-
-bool unichar_is_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 unichar_is_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;
-
- assert(str);
-
- 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, len, i;
-
- assert(str);
-
- 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 -EINVAL;
- }
-
- for (i = 1; i < len; i++) {
- if (((int)str[i] & 0xc0) != 0x80)
- return -EINVAL;
- unichar <<= 6;
- unichar |= (int)str[i] & 0x3f;
- }
-
- return unichar;
-}
-
-bool utf8_is_printable_newline(const char* str, size_t length, bool newline) {
- const char *p;
-
- assert(str);
-
- for (p = str; length;) {
- int encoded_len, val;
-
- encoded_len = utf8_encoded_valid_unichar(p);
- if (encoded_len < 0 ||
- (size_t) encoded_len > length)
- return false;
-
- val = utf8_encoded_to_unichar(p);
- if (val < 0 ||
- unichar_is_control(val) ||
- (!newline && val == '\n'))
- return false;
-
- length -= encoded_len;
- p += 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;
-
- len = utf8_encoded_valid_unichar((const char *)p);
- if (len < 0)
- return NULL;
-
- p += len;
- }
-
- return str;
-}
-
-char *utf8_escape_invalid(const char *str) {
- char *p, *s;
-
- assert(str);
-
- p = s = malloc(strlen(str) * 4 + 1);
- if (!p)
- return NULL;
-
- while (*str) {
- int len;
-
- len = utf8_encoded_valid_unichar(str);
- if (len > 0) {
- s = mempcpy(s, str, len);
- str += len;
- } else {
- s = stpcpy(s, UTF8_REPLACEMENT_CHARACTER);
- str += 1;
- }
- }
-
- *s = '\0';
-
- return p;
-}
-
-char *utf8_escape_non_printable(const char *str) {
- char *p, *s;
-
- assert(str);
-
- p = s = malloc(strlen(str) * 4 + 1);
- if (!p)
- return NULL;
-
- while (*str) {
- int len;
-
- len = utf8_encoded_valid_unichar(str);
- if (len > 0) {
- if (utf8_is_printable(str, len)) {
- s = mempcpy(s, str, len);
- str += len;
- } else {
- while (len > 0) {
- *(s++) = '\\';
- *(s++) = 'x';
- *(s++) = hexchar((int) *str >> 4);
- *(s++) = hexchar((int) *str);
-
- str += 1;
- len --;
- }
- }
- } else {
- s = stpcpy(s, UTF8_REPLACEMENT_CHARACTER);
- str += 1;
- }
- }
-
- *s = '\0';
-
- return p;
-}
-
-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;
-}
-
-/**
- * utf8_encode_unichar() - Encode single UCS-4 character as UTF-8
- * @out_utf8: output buffer of at least 4 bytes or NULL
- * @g: UCS-4 character to encode
- *
- * This encodes a single UCS-4 character as UTF-8 and writes it into @out_utf8.
- * The length of the character is returned. It is not zero-terminated! If the
- * output buffer is NULL, only the length is returned.
- *
- * Returns: The length in bytes that the UTF-8 representation does or would
- * occupy.
- */
-size_t utf8_encode_unichar(char *out_utf8, uint32_t g) {
-
- if (g < (1 << 7)) {
- if (out_utf8)
- out_utf8[0] = g & 0x7f;
- return 1;
- } else if (g < (1 << 11)) {
- if (out_utf8) {
- out_utf8[0] = 0xc0 | ((g >> 6) & 0x1f);
- out_utf8[1] = 0x80 | (g & 0x3f);
- }
- return 2;
- } else if (g < (1 << 16)) {
- if (out_utf8) {
- out_utf8[0] = 0xe0 | ((g >> 12) & 0x0f);
- out_utf8[1] = 0x80 | ((g >> 6) & 0x3f);
- out_utf8[2] = 0x80 | (g & 0x3f);
- }
- return 3;
- } else if (g < (1 << 21)) {
- if (out_utf8) {
- out_utf8[0] = 0xf0 | ((g >> 18) & 0x07);
- out_utf8[1] = 0x80 | ((g >> 12) & 0x3f);
- out_utf8[2] = 0x80 | ((g >> 6) & 0x3f);
- out_utf8[3] = 0x80 | (g & 0x3f);
- }
- return 4;
- }
-
- return 0;
-}
-
-char *utf16_to_utf8(const void *s, size_t length) {
- const uint8_t *f;
- char *r, *t;
-
- r = new(char, (length * 4 + 1) / 2 + 1);
- if (!r)
- return NULL;
-
- f = s;
- t = r;
-
- while (f < (const uint8_t*) s + length) {
- uint16_t w1, w2;
-
- /* see RFC 2781 section 2.2 */
-
- w1 = f[1] << 8 | f[0];
- f += 2;
-
- if (!utf16_is_surrogate(w1)) {
- t += utf8_encode_unichar(t, w1);
-
- continue;
- }
-
- if (utf16_is_trailing_surrogate(w1))
- continue;
- else if (f >= (const uint8_t*) s + length)
- break;
-
- w2 = f[1] << 8 | f[0];
- f += 2;
-
- if (!utf16_is_trailing_surrogate(w2)) {
- f -= 2;
- continue;
- }
-
- t += utf8_encode_unichar(t, utf16_surrogate_pair_to_unichar(w1, w2));
- }
-
- *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, unichar, i;
-
- assert(str);
-
- len = utf8_encoded_expected_len(str);
- if (len == 0)
- return -EINVAL;
-
- /* 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 -EINVAL;
-
- unichar = utf8_encoded_to_unichar(str);
-
- /* check if encoded length matches encoded value */
- if (utf8_unichar_to_encoded_len(unichar) != len)
- return -EINVAL;
-
- /* check if value has valid range */
- if (!unichar_is_valid(unichar))
- return -EINVAL;
-
- return len;
-}
~ianmdlvl / elogind.git / blobdiff