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asterisk/main/utf8.c

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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2020, Sean Bright
*
* Sean Bright <sean.bright@gmail.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief UTF-8 information and validation functions
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include "asterisk/utils.h"
#include "asterisk/utf8.h"
#include "asterisk/test.h"
/*
* BEGIN THIRD PARTY CODE
*
* Copyright (c) 2008-2010 Björn Höhrmann <bjoern@hoehrmann.de>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
*/
#define UTF8_ACCEPT 0
#define UTF8_REJECT 12
static const uint8_t utf8d[] = {
/* The first part of the table maps bytes to character classes that
* to reduce the size of the transition table and create bitmasks. */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8,
/* The second part is a transition table that maps a combination
* of a state of the automaton and a character class to a state. */
0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
12,36,12,12,12,12,12,12,12,12,12,12,
};
#if 0
/* We can bring this back if we need the codepoint? */
static uint32_t inline decode(uint32_t *state, uint32_t *codep, uint32_t byte) {
uint32_t type = utf8d[byte];
*codep = (*state != UTF8_ACCEPT) ?
(byte & 0x3fu) | (*codep << 6) :
(0xff >> type) & (byte);
*state = utf8d[256 + *state + type];
return *state;
}
#endif
static uint32_t inline decode(uint32_t *state, uint32_t byte) {
uint32_t type = utf8d[byte];
*state = utf8d[256 + *state + type];
return *state;
}
/*
* END THIRD PARTY CODE
*
* See copyright notice above.
*/
int ast_utf8_is_valid(const char *src)
{
uint32_t state = UTF8_ACCEPT;
while (*src) {
decode(&state, (uint8_t) *src++);
}
return state == UTF8_ACCEPT;
}
int ast_utf8_is_validn(const char *src, size_t size)
{
uint32_t state = UTF8_ACCEPT;
while (size && *src) {
decode(&state, (uint8_t) *src++);
size--;
}
return state == UTF8_ACCEPT;
}
void ast_utf8_copy_string(char *dst, const char *src, size_t size)
{
uint32_t state = UTF8_ACCEPT;
char *last_good = dst;
ast_assert(size > 0);
while (size && *src) {
if (decode(&state, (uint8_t) *src) == UTF8_REJECT) {
/* We _could_ replace with U+FFFD and try to recover, but for now
* we treat this the same as if we had run out of space */
break;
}
*dst++ = *src++;
size--;
if (size && state == UTF8_ACCEPT) {
/* last_good is where we will ultimately write the 0 byte */
last_good = dst;
}
}
*last_good = '\0';
}
struct ast_utf8_validator {
uint32_t state;
};
int ast_utf8_validator_new(struct ast_utf8_validator **validator)
{
struct ast_utf8_validator *tmp = ast_malloc(sizeof(*tmp));
if (!tmp) {
return 1;
}
tmp->state = UTF8_ACCEPT;
*validator = tmp;
return 0;
}
enum ast_utf8_validation_result ast_utf8_validator_state(
struct ast_utf8_validator *validator)
{
switch (validator->state) {
case UTF8_ACCEPT:
return AST_UTF8_VALID;
case UTF8_REJECT:
return AST_UTF8_INVALID;
default:
return AST_UTF8_UNKNOWN;
}
}
enum ast_utf8_validation_result ast_utf8_validator_feed(
struct ast_utf8_validator *validator, const char *data)
{
while (*data) {
decode(&validator->state, (uint8_t) *data++);
}
return ast_utf8_validator_state(validator);
}
enum ast_utf8_validation_result ast_utf8_validator_feedn(
struct ast_utf8_validator *validator, const char *data, size_t size)
{
while (size && *data) {
decode(&validator->state, (uint8_t) *data++);
size--;
}
return ast_utf8_validator_state(validator);
}
void ast_utf8_validator_reset(struct ast_utf8_validator *validator)
{
validator->state = UTF8_ACCEPT;
}
void ast_utf8_validator_destroy(struct ast_utf8_validator *validator)
{
ast_free(validator);
}
#ifdef TEST_FRAMEWORK
AST_TEST_DEFINE(test_utf8_is_valid)
{
switch (cmd) {
case TEST_INIT:
info->name = "is_valid";
info->category = "/main/utf8/";
info->summary = "Test ast_utf8_is_valid and ast_utf8_is_validn";
info->description =
"Tests UTF-8 string validation code.";
return AST_TEST_NOT_RUN;
case TEST_EXECUTE:
break;
}
/* Valid UTF-8 */
ast_test_validate(test, ast_utf8_is_valid("Asterisk"));
ast_test_validate(test, ast_utf8_is_valid("\xce\xbb"));
ast_test_validate(test, ast_utf8_is_valid("\xe2\x8a\x9b"));
ast_test_validate(test, ast_utf8_is_valid("\xf0\x9f\x93\x9e"));
/* Valid with leading */
ast_test_validate(test, ast_utf8_is_valid("aaa Asterisk"));
ast_test_validate(test, ast_utf8_is_valid("aaa \xce\xbb"));
ast_test_validate(test, ast_utf8_is_valid("aaa \xe2\x8a\x9b"));
ast_test_validate(test, ast_utf8_is_valid("aaa \xf0\x9f\x93\x9e"));
/* Valid with trailing */
ast_test_validate(test, ast_utf8_is_valid("Asterisk aaa"));
ast_test_validate(test, ast_utf8_is_valid("\xce\xbb aaa"));
ast_test_validate(test, ast_utf8_is_valid("\xe2\x8a\x9b aaa"));
ast_test_validate(test, ast_utf8_is_valid("\xf0\x9f\x93\x9e aaa"));
/* Valid with leading and trailing */
ast_test_validate(test, ast_utf8_is_valid("aaa Asterisk aaa"));
ast_test_validate(test, ast_utf8_is_valid("aaa \xce\xbb aaa"));
ast_test_validate(test, ast_utf8_is_valid("aaa \xe2\x8a\x9b aaa"));
ast_test_validate(test, ast_utf8_is_valid("aaa \xf0\x9f\x93\x9e aaa"));
/* Valid if limited by number of bytes */
ast_test_validate(test, ast_utf8_is_validn("Asterisk" "\xff", strlen("Asterisk")));
ast_test_validate(test, ast_utf8_is_validn("\xce\xbb" "\xff", strlen("\xce\xbb")));
ast_test_validate(test, ast_utf8_is_validn("\xe2\x8a\x9b" "\xff", strlen("\xe2\x8a\x9b")));
ast_test_validate(test, ast_utf8_is_validn("\xf0\x9f\x93\x9e" "\xff", strlen("\xf0\x9f\x93\x9e")));
/* Invalid */
ast_test_validate(test, !ast_utf8_is_valid("\xc0\x8a")); /* Overlong */
ast_test_validate(test, !ast_utf8_is_valid("98.6\xa7")); /* 'High ASCII' */
ast_test_validate(test, !ast_utf8_is_valid("\xc3\x28"));
ast_test_validate(test, !ast_utf8_is_valid("\xa0\xa1"));
ast_test_validate(test, !ast_utf8_is_valid("\xe2\x28\xa1"));
ast_test_validate(test, !ast_utf8_is_valid("\xe2\x82\x28"));
ast_test_validate(test, !ast_utf8_is_valid("\xf0\x28\x8c\xbc"));
ast_test_validate(test, !ast_utf8_is_valid("\xf0\x90\x28\xbc"));
ast_test_validate(test, !ast_utf8_is_valid("\xf0\x28\x8c\x28"));
return AST_TEST_PASS;
}
static int test_copy_and_compare(const char *src, size_t dst_len, const char *cmp)
{
char dst[dst_len];
ast_utf8_copy_string(dst, src, dst_len);
return strcmp(dst, cmp) == 0;
}
AST_TEST_DEFINE(test_utf8_copy_string)
{
switch (cmd) {
case TEST_INIT:
info->name = "copy_string";
info->category = "/main/utf8/";
info->summary = "Test ast_utf8_copy_string";
info->description =
"Tests UTF-8 string copying code.";
return AST_TEST_NOT_RUN;
case TEST_EXECUTE:
break;
}
ast_test_validate(test, test_copy_and_compare("Asterisk", 6, "Aster"));
ast_test_validate(test, test_copy_and_compare("Asterisk \xc2\xae", 11, "Asterisk "));
ast_test_validate(test, test_copy_and_compare("Asterisk \xc2\xae", 12, "Asterisk \xc2\xae"));
ast_test_validate(test, test_copy_and_compare("Asterisk \xc0\x8a", 12, "Asterisk "));
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 1, ""));
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 2, ""));
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 3, "\xce\xbb"));
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 4, "\xce\xbb "));
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 5, "\xce\xbb x"));
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 6, "\xce\xbb xy"));
ast_test_validate(test, test_copy_and_compare("\xce\xbb xyz", 7, "\xce\xbb xyz"));
return AST_TEST_PASS;
}
AST_TEST_DEFINE(test_utf8_validator)
{
struct ast_utf8_validator *validator;
switch (cmd) {
case TEST_INIT:
info->name = "utf8_validator";
info->category = "/main/utf8/";
info->summary = "Test ast_utf8_validator";
info->description =
"Tests UTF-8 progressive validator code.";
return AST_TEST_NOT_RUN;
case TEST_EXECUTE:
break;
}
if (ast_utf8_validator_new(&validator)) {
return AST_TEST_FAIL;
}
ast_test_validate(test, ast_utf8_validator_feed(validator, "Asterisk") == AST_UTF8_VALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xc2") == AST_UTF8_UNKNOWN);
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xae") == AST_UTF8_VALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "Private") == AST_UTF8_VALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "Branch") == AST_UTF8_VALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "Exchange") == AST_UTF8_VALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xe2") == AST_UTF8_UNKNOWN);
ast_test_validate(test, ast_utf8_validator_feed(validator, "\x84") == AST_UTF8_UNKNOWN);
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xbb") == AST_UTF8_VALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "\xc0\x8a") == AST_UTF8_INVALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "valid") == AST_UTF8_INVALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "valid") == AST_UTF8_INVALID);
ast_test_validate(test, ast_utf8_validator_feed(validator, "valid") == AST_UTF8_INVALID);
ast_utf8_validator_destroy(validator);
return AST_TEST_PASS;
}
static void test_utf8_shutdown(void)
{
AST_TEST_UNREGISTER(test_utf8_is_valid);
AST_TEST_UNREGISTER(test_utf8_copy_string);
AST_TEST_UNREGISTER(test_utf8_validator);
}
int ast_utf8_init(void)
{
AST_TEST_REGISTER(test_utf8_is_valid);
AST_TEST_REGISTER(test_utf8_copy_string);
AST_TEST_REGISTER(test_utf8_validator);
ast_register_cleanup(test_utf8_shutdown);
return 0;
}
#else /* !TEST_FRAMEWORK */
int ast_utf8_init(void)
{
return 0;
}
#endif
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