286 lines
8.6 KiB
C
286 lines
8.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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/* This file is based on the GLIB utf8 validation functions. The
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* original license text follows. */
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/* gutf8.c - Operations on UTF-8 strings.
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*
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* Copyright (C) 1999 Tom Tromey
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* Copyright (C) 2000 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <string.h>
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#include <stdbool.h>
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#include "utf8.h"
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#define FILTER_CHAR '_'
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static inline bool is_unicode_valid(uint32_t ch) {
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if (ch >= 0x110000) /* End of unicode space */
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return false;
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if ((ch & 0xFFFFF800) == 0xD800) /* Reserved area for UTF-16 */
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return false;
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if ((ch >= 0xFDD0) && (ch <= 0xFDEF)) /* Reserved */
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return false;
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if ((ch & 0xFFFE) == 0xFFFE) /* BOM (Byte Order Mark) */
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return false;
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return true;
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}
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static inline bool is_continuation_char(uint8_t ch) {
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if ((ch & 0xc0) != 0x80) /* 10xxxxxx */
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return false;
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return true;
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}
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static inline void merge_continuation_char(uint32_t *u_ch, uint8_t ch) {
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*u_ch <<= 6;
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*u_ch |= ch & 0x3f;
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}
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static bool is_unicode_control(uint32_t ch) {
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/*
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0 to ' '-1 is the C0 range.
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DEL=0x7F, and DEL+1 to 0x9F is C1 range.
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'\t' is in C0 range, but more or less harmless and commonly used.
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*/
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return (ch < ' ' && ch != '\t') ||
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(0x7F <= ch && ch <= 0x9F);
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}
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char* utf8_is_printable_n(const char* str, size_t length) {
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uint32_t val = 0;
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uint32_t min = 0;
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const uint8_t *p;
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assert(str);
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for (p = (const uint8_t*) str; length; p++, length--) {
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if (*p < 128) {
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val = *p;
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} else {
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if ((*p & 0xe0) == 0xc0) { /* 110xxxxx two-char seq. */
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min = 128;
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val = (uint32_t) (*p & 0x1e);
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goto ONE_REMAINING;
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} else if ((*p & 0xf0) == 0xe0) { /* 1110xxxx three-char seq.*/
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min = (1 << 11);
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val = (uint32_t) (*p & 0x0f);
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goto TWO_REMAINING;
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} else if ((*p & 0xf8) == 0xf0) { /* 11110xxx four-char seq */
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min = (1 << 16);
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val = (uint32_t) (*p & 0x07);
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} else
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goto error;
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p++;
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length--;
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if (!length || !is_continuation_char(*p))
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goto error;
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merge_continuation_char(&val, *p);
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TWO_REMAINING:
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p++;
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length--;
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if (!is_continuation_char(*p))
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goto error;
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merge_continuation_char(&val, *p);
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ONE_REMAINING:
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p++;
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length--;
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if (!is_continuation_char(*p))
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goto error;
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merge_continuation_char(&val, *p);
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if (val < min)
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goto error;
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}
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if (is_unicode_control(val))
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goto error;
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}
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return (char*) str;
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error:
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return NULL;
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}
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static char* utf8_validate(const char *str, char *output) {
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uint32_t val = 0;
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uint32_t min = 0;
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const uint8_t *p, *last;
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int size;
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uint8_t *o;
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assert(str);
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o = (uint8_t*) output;
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for (p = (const uint8_t*) str; *p; p++) {
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if (*p < 128) {
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if (o)
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*o = *p;
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} else {
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last = p;
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if ((*p & 0xe0) == 0xc0) { /* 110xxxxx two-char seq. */
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size = 2;
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min = 128;
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val = (uint32_t) (*p & 0x1e);
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goto ONE_REMAINING;
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} else if ((*p & 0xf0) == 0xe0) { /* 1110xxxx three-char seq.*/
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size = 3;
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min = (1 << 11);
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val = (uint32_t) (*p & 0x0f);
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goto TWO_REMAINING;
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} else if ((*p & 0xf8) == 0xf0) { /* 11110xxx four-char seq */
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size = 4;
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min = (1 << 16);
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val = (uint32_t) (*p & 0x07);
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} else
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goto error;
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p++;
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if (!is_continuation_char(*p))
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goto error;
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merge_continuation_char(&val, *p);
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TWO_REMAINING:
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p++;
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if (!is_continuation_char(*p))
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goto error;
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merge_continuation_char(&val, *p);
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ONE_REMAINING:
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p++;
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if (!is_continuation_char(*p))
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goto error;
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merge_continuation_char(&val, *p);
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if (val < min)
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goto error;
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if (!is_unicode_valid(val))
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goto error;
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if (o) {
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memcpy(o, last, (size_t) size);
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o += size;
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}
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continue;
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error:
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if (o) {
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*o = FILTER_CHAR;
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p = last; /* We retry at the next character */
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} else
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goto failure;
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}
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if (o)
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o++;
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}
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if (o) {
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*o = '\0';
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return output;
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}
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return (char*) str;
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failure:
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return NULL;
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}
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char* utf8_is_valid (const char *str) {
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return utf8_validate(str, NULL);
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}
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char* utf8_filter (const char *str) {
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char *new_str;
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assert(str);
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new_str = malloc(strlen(str) + 1);
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if (!new_str)
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return NULL;
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return utf8_validate(str, new_str);
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}
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char *ascii_is_valid(const char *str) {
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const char *p;
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assert(str);
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for (p = str; *p; p++)
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if ((unsigned char) *p >= 128)
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return NULL;
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return (char*) str;
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}
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char *ascii_filter(const char *str) {
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const char *s;
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char *r, *d;
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size_t l;
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assert(str);
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l = strlen(str);
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r = malloc(l + 1);
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if (!r)
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return NULL;
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for (s = str, d = r; *s; s++)
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if ((unsigned char) *s < 128)
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*(d++) = *s;
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*d = 0;
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return r;
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}
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