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GUACAMOLE-478: Implement encoding translation functions for normalizing newline sequences.

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This commit is contained in:
Michael Jumper 2021-12-25 00:07:47 -08:00
parent b9cc76058b
commit 7472310a03
6 changed files with 500 additions and 116 deletions
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48
src/common/common/iconv.h
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@ -76,6 +76,30 @@ guac_iconv_read GUAC_READ_CP1252;
*/
guac_iconv_read GUAC_READ_ISO8859_1;
/**
* Read function for UTF-8 which normalizes newline character sequences like
* "\r\n" to Unix-style newlines ('\n').
*/
guac_iconv_read GUAC_READ_UTF8_NORMALIZED;
/**
* Read function for UTF-16 which normalizes newline character sequences like
* "\r\n" to Unix-style newlines ('\n').
*/
guac_iconv_read GUAC_READ_UTF16_NORMALIZED;
/**
* Read function for CP-1252 which normalizes newline character sequences like
* "\r\n" to Unix-style newlines ('\n').
*/
guac_iconv_read GUAC_READ_CP1252_NORMALIZED;
/**
* Read function for ISO 8859-1 which normalizes newline character sequences
* like "\r\n" to Unix-style newlines ('\n').
*/
guac_iconv_read GUAC_READ_ISO8859_1_NORMALIZED;
/**
* Write function for UTF8.
*/
@ -96,5 +120,29 @@ guac_iconv_write GUAC_WRITE_CP1252;
*/
guac_iconv_write GUAC_WRITE_ISO8859_1;
/**
* Write function for UTF-8 which writes newline characters ('\n') as
* Windows-style newlines ("\r\n").
*/
guac_iconv_write GUAC_WRITE_UTF8_CRLF;
/**
* Write function for UTF-16 which writes newline characters ('\n') as
* Windows-style newlines ("\r\n").
*/
guac_iconv_write GUAC_WRITE_UTF16_CRLF;
/**
* Write function for CP-1252 which writes newline characters ('\n') as
* Windows-style newlines ("\r\n").
*/
guac_iconv_write GUAC_WRITE_CP1252_CRLF;
/**
* Write function for ISO 8859-1 which writes newline characters ('\n') as
* Windows-style newlines ("\r\n").
*/
guac_iconv_write GUAC_WRITE_ISO8859_1_CRLF;
#endif

114
src/common/iconv.c
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@ -138,6 +138,70 @@ int GUAC_READ_ISO8859_1(const char** input, int remaining) {
}
/**
* Invokes the given reader function, automatically normalizing newline
* sequences as Unix-style newline characters ('\n'). All other charaters are
* read verbatim.
*
* @param reader
* The reader to use to read the given character.
*
* @param input
* Pointer to the location within the input buffer that the next character
* should be read from.
*
* @param remaining
* The number of bytes remaining in the input buffer.
*
* @return
* The codepoint that was read, or zero if the end of the input string has
* been reached.
*/
static int guac_iconv_read_normalized(guac_iconv_read* reader,
const char** input, int remaining) {
/* Read requested character */
const char* input_start = *input;
int value = reader(input, remaining);
/* Automatically translate CRLF pairs to simple newlines */
if (value == '\r') {
/* Peek ahead by one character, adjusting remaining bytes relative to
* last read */
int peek_remaining = remaining - (*input - input_start);
const char* peek_input = *input;
int peek_value = reader(&peek_input, peek_remaining);
/* Consider read value to be a newline if we have encountered a "\r\n"
* (CRLF) pair */
if (peek_value == '\n') {
value = '\n';
*input = peek_input;
}
}
return value;
}
int GUAC_READ_UTF8_NORMALIZED(const char** input, int remaining) {
return guac_iconv_read_normalized(GUAC_READ_UTF8, input, remaining);
}
int GUAC_READ_UTF16_NORMALIZED(const char** input, int remaining) {
return guac_iconv_read_normalized(GUAC_READ_UTF16, input, remaining);
}
int GUAC_READ_CP1252_NORMALIZED(const char** input, int remaining) {
return guac_iconv_read_normalized(GUAC_READ_CP1252, input, remaining);
}
int GUAC_READ_ISO8859_1_NORMALIZED(const char** input, int remaining) {
return guac_iconv_read_normalized(GUAC_READ_ISO8859_1, input, remaining);
}
void GUAC_WRITE_UTF8(char** output, int remaining, int value) {
*output += guac_utf8_write(value, *output, remaining);
}
@ -190,3 +254,53 @@ void GUAC_WRITE_ISO8859_1(char** output, int remaining, int value) {
(*output)++;
}
/**
* Invokes the given writer function, automatically writing newline characters
* ('\n') as CRLF ("\r\n"). All other charaters are written verbatim.
*
* @param writer
* The writer to use to write the given character.
*
* @param output
* Pointer to the location within the output buffer that the next character
* should be written.
*
* @param remaining
* The number of bytes remaining in the output buffer.
*
* @param value
* The codepoint of the character to write.
*/
static void guac_iconv_write_crlf(guac_iconv_write* writer, char** output,
int remaining, int value) {
if (value != '\n') {
writer(output, remaining, value);
return;
}
char* output_start = *output;
writer(output, remaining, '\r');
remaining -= *output - output_start;
if (remaining > 0)
writer(output, remaining, '\n');
}
void GUAC_WRITE_UTF8_CRLF(char** output, int remaining, int value) {
guac_iconv_write_crlf(GUAC_WRITE_UTF8, output, remaining, value);
}
void GUAC_WRITE_UTF16_CRLF(char** output, int remaining, int value) {
guac_iconv_write_crlf(GUAC_WRITE_UTF16, output, remaining, value);
}
void GUAC_WRITE_CP1252_CRLF(char** output, int remaining, int value) {
guac_iconv_write_crlf(GUAC_WRITE_CP1252, output, remaining, value);
}
void GUAC_WRITE_ISO8859_1_CRLF(char** output, int remaining, int value) {
guac_iconv_write_crlf(GUAC_WRITE_ISO8859_1, output, remaining, value);
}

4
src/common/tests/Makefile.am
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@ -33,8 +33,12 @@ ACLOCAL_AMFLAGS = -I m4
check_PROGRAMS = test_common
TESTS = $(check_PROGRAMS)
noinst_HEADERS = \
iconv/convert-test-data.h
test_common_SOURCES = \
iconv/convert.c \
iconv/convert-test-data.c \
rect/clip_and_split.c \
rect/constrain.c \
rect/expand_to_grid.c \

153
src/common/tests/iconv/convert-test-data.c Normal file
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@ -0,0 +1,153 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include "common/iconv.h"
#include "convert-test-data.h"
encoding_test_parameters test_params[NUM_SUPPORTED_ENCODINGS] = {
/*
* UTF-8
*/
{
"UTF-8",
GUAC_READ_UTF8, GUAC_READ_UTF8_NORMALIZED,
GUAC_WRITE_UTF8, GUAC_WRITE_UTF8_CRLF,
.test_mixed = TEST_STRING(
"pap\xC3\xA0 \xC3\xA8 bello\n"
"pap\xC3\xA0 \xC3\xA8 bello\r\n"
"pap\xC3\xA0 \xC3\xA8 bello\n"
"pap\xC3\xA0 \xC3\xA8 bello\r\n"
"pap\xC3\xA0 \xC3\xA8 bello"
),
.test_unix = TEST_STRING(
"pap\xC3\xA0 \xC3\xA8 bello\n"
"pap\xC3\xA0 \xC3\xA8 bello\n"
"pap\xC3\xA0 \xC3\xA8 bello\n"
"pap\xC3\xA0 \xC3\xA8 bello\n"
"pap\xC3\xA0 \xC3\xA8 bello"
),
.test_windows = TEST_STRING(
"pap\xC3\xA0 \xC3\xA8 bello\r\n"
"pap\xC3\xA0 \xC3\xA8 bello\r\n"
"pap\xC3\xA0 \xC3\xA8 bello\r\n"
"pap\xC3\xA0 \xC3\xA8 bello\r\n"
"pap\xC3\xA0 \xC3\xA8 bello"
)
},
/*
* UTF-16
*/
{
"UTF-16",
GUAC_READ_UTF16, GUAC_READ_UTF16_NORMALIZED,
GUAC_WRITE_UTF16, GUAC_WRITE_UTF16_CRLF,
.test_mixed = TEST_STRING(
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\r\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\r\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00"
"\x00"
),
.test_unix = TEST_STRING(
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00"
"\x00"
),
.test_windows = TEST_STRING(
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\r\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\r\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\r\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00" "\r\x00" "\n\x00"
"p\x00" "a\x00" "p\x00" "\xE0\x00" " \x00" "\xE8\x00" " \x00" "b\x00" "e\x00" "l\x00" "l\x00" "o\x00"
"\x00"
)
},
/*
* ISO 8859-1
*/
{
"ISO 8859-1",
GUAC_READ_ISO8859_1, GUAC_READ_ISO8859_1_NORMALIZED,
GUAC_WRITE_ISO8859_1, GUAC_WRITE_ISO8859_1_CRLF,
.test_mixed = TEST_STRING(
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello"
),
.test_unix = TEST_STRING(
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello"
),
.test_windows = TEST_STRING(
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello"
)
},
/*
* CP-1252
*/
{
"CP-1252",
GUAC_READ_CP1252, GUAC_READ_CP1252_NORMALIZED,
GUAC_WRITE_CP1252, GUAC_WRITE_CP1252_CRLF,
.test_mixed = TEST_STRING(
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello"
),
.test_unix = TEST_STRING(
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello\n"
"pap\xE0 \xE8 bello"
),
.test_windows = TEST_STRING(
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello\r\n"
"pap\xE0 \xE8 bello"
)
}
};

121
src/common/tests/iconv/convert-test-data.h Normal file
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@ -0,0 +1,121 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include "common/iconv.h"
/**
* Representation of test string data and its length in bytes.
*/
typedef struct test_string {
/**
* The raw content of the test string.
*/
unsigned char* buffer;
/**
* The number of bytes within the test string, including null terminator.
*/
int size;
} test_string;
/**
* Convenience macro which statically-initializes a test_string with the given
* string value, automatically calculating its size in bytes.
*
* @param value
* The string value.
*/
#define TEST_STRING(value) { \
.buffer = (unsigned char*) (value), \
.size = sizeof(value) \
}
/**
* The parameters applicable to a unit test for a particular encoding supported
* by guac_iconv().
*/
typedef struct encoding_test_parameters {
/**
* The human-readable name of this encoding. This will be logged to the
* test suite log to assist with debugging test failures.
*/
const char* name;
/**
* Reader function which reads using this encoding and does not perform any
* transformation on newline characters.
*/
guac_iconv_read* reader;
/**
* Reader function which reads using this encoding and automatically
* normalizes newline sequences to Unix-style newline characters.
*/
guac_iconv_read* reader_normalized;
/**
* Writer function which writes using this encoding and does not perform
* any transformation on newline characters.
*/
guac_iconv_write* writer;
/**
* Writer function which writes using this encoding, but writes newline
* characters as CRLF sequences.
*/
guac_iconv_write* writer_crlf;
/**
* A test string having both Windows- and Unix-style line endings. Except
* for the line endings, the characters represented within this test string
* must be identical to all other test strings.
*/
test_string test_mixed;
/**
* A test string having only Unix-style line endings. Except for the line
* endings, the characters represented within this test string must be
* identical to all other test strings.
*/
test_string test_unix;
/**
* A test string having only Windows-style line endings. Except for the
* line endings, the characters represented within this test string must be
* identical to all other test strings.
*/
test_string test_windows;
} encoding_test_parameters;
/**
* The total number of encodings supported by guac_iconv().
*/
#define NUM_SUPPORTED_ENCODINGS 4
/**
* Test parameters for each supported encoding. The test strings included each
* consist of five repeated lines of "papà è bello", omitting the line ending
* of the final line.
*/
extern encoding_test_parameters test_params[NUM_SUPPORTED_ENCODINGS];

170
src/common/tests/iconv/convert.c
View File

@ -18,48 +18,10 @@
*/
#include "common/iconv.h"
#include "convert-test-data.h"
#include <CUnit/CUnit.h>
/**
* UTF8 for "papà è bello".
*/
unsigned char test_string_utf8[] = {
'p', 'a', 'p', 0xC3, 0xA0, ' ',
0xC3, 0xA8, ' ',
'b', 'e', 'l', 'l', 'o',
0x00
};
/**
* UTF16 for "papà è bello".
*/
unsigned char test_string_utf16[] = {
'p', 0x00, 'a', 0x00, 'p', 0x00, 0xE0, 0x00, ' ', 0x00,
0xE8, 0x00, ' ', 0x00,
'b', 0x00, 'e', 0x00, 'l', 0x00, 'l', 0x00, 'o', 0x00,
0x00, 0x00
};
/**
* ISO-8859-1 for "papà è bello".
*/
unsigned char test_string_iso8859_1[] = {
'p', 'a', 'p', 0xE0, ' ',
0xE8, ' ',
'b', 'e', 'l', 'l', 'o',
0x00
};
/**
* CP1252 for "papà è bello".
*/
unsigned char test_string_cp1252[] = {
'p', 'a', 'p', 0xE0, ' ',
0xE8, ' ',
'b', 'e', 'l', 'l', 'o',
0x00
};
#include <stdio.h>
/**
* Tests that conversion between character sets using the given guac_iconv_read
@ -69,25 +31,20 @@ unsigned char test_string_cp1252[] = {
* The guac_iconv_read implementation to use to read the input string.
*
* @param in_string
* A pointer to the beginning of the input string.
*
* @param in_length
* The size of the input string in bytes.
* A pointer to the test_string structure describing the input string being
* tested.
*
* @param writer
* The guac_iconv_write implementation to use to write the output string
* (the converted input string).
*
* @param out_string
* A pointer to the beginning of a string which contains the expected
* result of the conversion.
*
* @param out_length
* The size of the expected result in bytes.
* A pointer to the test_string structure describing the expected result of
* the conversion.
*/
static void verify_conversion(
guac_iconv_read* reader, unsigned char* in_string, int in_length,
guac_iconv_write* writer, unsigned char* out_string, int out_length) {
guac_iconv_read* reader, test_string* in_string,
guac_iconv_write* writer, test_string* out_string) {
char output[4096];
char input[4096];
@ -95,91 +52,78 @@ static void verify_conversion(
const char* current_input = input;
char* current_output = output;
memcpy(input, in_string, in_length);
memcpy(input, in_string->buffer, in_string->size);
guac_iconv(reader, &current_input, sizeof(input),
writer, &current_output, sizeof(output));
/* Verify output length */
CU_ASSERT_EQUAL(out_length, current_output - output);
CU_ASSERT_EQUAL(out_string->size, current_output - output);
/* Verify entire input read */
CU_ASSERT_EQUAL(in_length, current_input - input);
CU_ASSERT_EQUAL(in_string->size, current_input - input);
/* Verify output content */
CU_ASSERT_EQUAL(0, memcmp(output, out_string, out_length));
CU_ASSERT_EQUAL(0, memcmp(output, out_string->buffer, out_string->size));
}
/**
* Tests which verifies conversion of UTF-8 to itself.
* Test which verifies that every supported encoding can be correctly converted
* to every other supported encoding, with all line endings preserved verbatim
* (not normalized).
*/
void test_iconv__utf8_to_utf8() {
verify_conversion(
GUAC_READ_UTF8, test_string_utf8, sizeof(test_string_utf8),
GUAC_WRITE_UTF8, test_string_utf8, sizeof(test_string_utf8));
void test_iconv__preserve() {
for (int i = 0; i < NUM_SUPPORTED_ENCODINGS; i++) {
for (int j = 0; j < NUM_SUPPORTED_ENCODINGS; j++) {
encoding_test_parameters* from = &test_params[i];
encoding_test_parameters* to = &test_params[j];
printf("# \"%s\" -> \"%s\" ...\n", from->name, to->name);
verify_conversion(from->reader, &from->test_mixed,
to->writer, &to->test_mixed);
}
}
}
/**
* Tests which verifies conversion of UTF-16 to UTF-8.
* Test which verifies that every supported encoding can be correctly converted
* to every other supported encoding, normalizing all line endings to
* Unix-style line endings.
*/
void test_iconv__utf8_to_utf16() {
verify_conversion(
GUAC_READ_UTF8, test_string_utf8, sizeof(test_string_utf8),
GUAC_WRITE_UTF16, test_string_utf16, sizeof(test_string_utf16));
void test_iconv__normalize_unix() {
for (int i = 0; i < NUM_SUPPORTED_ENCODINGS; i++) {
for (int j = 0; j < NUM_SUPPORTED_ENCODINGS; j++) {
encoding_test_parameters* from = &test_params[i];
encoding_test_parameters* to = &test_params[j];
printf("# \"%s\" -> \"%s\" ...\n", from->name, to->name);
verify_conversion(from->reader_normalized, &from->test_mixed,
to->writer, &to->test_unix);
}
}
}
/**
* Tests which verifies conversion of UTF-16 to itself.
* Test which verifies that every supported encoding can be correctly converted
* to every other supported encoding, normalizing all line endings to
* Windows-style line endings.
*/
void test_iconv__utf16_to_utf16() {
verify_conversion(
GUAC_READ_UTF16, test_string_utf16, sizeof(test_string_utf16),
GUAC_WRITE_UTF16, test_string_utf16, sizeof(test_string_utf16));
}
void test_iconv__normalize_crlf() {
for (int i = 0; i < NUM_SUPPORTED_ENCODINGS; i++) {
for (int j = 0; j < NUM_SUPPORTED_ENCODINGS; j++) {
/**
* Tests which verifies conversion of UTF-8 to UTF-16.
*/
void test_iconv__utf16_to_utf8() {
verify_conversion(
GUAC_READ_UTF16, test_string_utf16, sizeof(test_string_utf16),
GUAC_WRITE_UTF8, test_string_utf8, sizeof(test_string_utf8));
}
encoding_test_parameters* from = &test_params[i];
encoding_test_parameters* to = &test_params[j];
/**
* Tests which verifies conversion of UTF-16 to ISO 8859-1.
*/
void test_iconv__utf16_to_iso8859_1() {
verify_conversion(
GUAC_READ_UTF16, test_string_utf16, sizeof(test_string_utf16),
GUAC_WRITE_ISO8859_1, test_string_iso8859_1, sizeof(test_string_iso8859_1));
}
/**
* Tests which verifies conversion of UTF-16 to CP1252.
*/
void test_iconv__utf16_to_cp1252() {
verify_conversion(
GUAC_READ_UTF16, test_string_utf16, sizeof(test_string_utf16),
GUAC_WRITE_CP1252, test_string_cp1252, sizeof(test_string_cp1252));
}
/**
* Tests which verifies conversion of CP1252 to UTF-8.
*/
void test_iconv__cp1252_to_utf8() {
verify_conversion(
GUAC_READ_CP1252, test_string_cp1252, sizeof(test_string_cp1252),
GUAC_WRITE_UTF8, test_string_utf8, sizeof(test_string_utf8));
}
/**
* Tests which verifies conversion of ISO 8859-1 to UTF-8.
*/
void test_iconv__iso8859_1_to_utf8() {
verify_conversion(
GUAC_READ_ISO8859_1, test_string_iso8859_1, sizeof(test_string_iso8859_1),
GUAC_WRITE_UTF8, test_string_utf8, sizeof(test_string_utf8));
printf("# \"%s\" -> \"%s\" ...\n", from->name, to->name);
verify_conversion(from->reader_normalized, &from->test_mixed,
to->writer_crlf, &to->test_windows);
}
}
}