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April 28, 2021 12:42
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Fluent-bit issue 3142
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
/* Fluent Bit | |
* ========== | |
* Copyright (C) 2019-2021 The Fluent Bit Authors | |
* Copyright (C) 2015-2018 Treasure Data Inc. | |
* | |
* Licensed 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 <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <stdint.h> | |
static int octal_digit(char c) | |
{ | |
return (c >= '0' && c <= '7'); | |
} | |
static int hex_digit(char c) | |
{ | |
return ((c >= '0' && c <= '9') || | |
(c >= 'A' && c <= 'F') || | |
(c >= 'a' && c <= 'f')); | |
} | |
static int u8_wc_toutf8(char *dest, uint32_t ch) | |
{ | |
if (ch < 0x80) { | |
dest[0] = (char)ch; | |
return 1; | |
} | |
if (ch < 0x800) { | |
dest[0] = (ch>>6) | 0xC0; | |
dest[1] = (ch & 0x3F) | 0x80; | |
return 2; | |
} | |
if (ch < 0x10000) { | |
dest[0] = (ch>>12) | 0xE0; | |
dest[1] = ((ch>>6) & 0x3F) | 0x80; | |
dest[2] = (ch & 0x3F) | 0x80; | |
return 3; | |
} | |
if (ch < 0x110000) { | |
dest[0] = (ch>>18) | 0xF0; | |
dest[1] = ((ch>>12) & 0x3F) | 0x80; | |
dest[2] = ((ch>>6) & 0x3F) | 0x80; | |
dest[3] = (ch & 0x3F) | 0x80; | |
return 4; | |
} | |
return 0; | |
} | |
/* assumes that src points to the character after a backslash | |
returns number of input characters processed */ | |
static int u8_read_escape_sequence(const char *str, int size, uint32_t *dest) | |
{ | |
uint32_t ch; | |
char digs[9]="\0\0\0\0\0\0\0\0"; | |
int dno=0, i=1; | |
ch = (uint32_t)str[0]; /* take literal character */ | |
if (str[0] == 'n') | |
ch = L'\n'; | |
else if (str[0] == 't') | |
ch = L'\t'; | |
else if (str[0] == 'r') | |
ch = L'\r'; | |
else if (str[0] == 'b') | |
ch = L'\b'; | |
else if (str[0] == 'f') | |
ch = L'\f'; | |
else if (str[0] == 'v') | |
ch = L'\v'; | |
else if (str[0] == 'a') | |
ch = L'\a'; | |
else if (octal_digit(str[0])) { | |
i = 0; | |
do { | |
digs[dno++] = str[i++]; | |
} while (i < size && octal_digit(str[i]) && dno < 3); | |
ch = strtol(digs, NULL, 8); | |
} | |
else if (str[0] == 'x') { | |
while (i < size && hex_digit(str[i]) && dno < 2) { | |
digs[dno++] = str[i++]; | |
} | |
if (dno > 0) { | |
ch = strtol(digs, NULL, 16); | |
} | |
} | |
else if (str[0] == 'u') { | |
while (i < size && hex_digit(str[i]) && dno < 4) { | |
digs[dno++] = str[i++]; | |
} | |
if (dno > 0) { | |
ch = strtol(digs, NULL, 16); | |
} | |
} | |
else if (str[0] == 'U') { | |
while (i < size && hex_digit(str[i]) && dno < 8) { | |
digs[dno++] = str[i++]; | |
} | |
if (dno > 0) { | |
ch = strtol(digs, NULL, 16); | |
} | |
} | |
*dest = ch; | |
return i; | |
} | |
int flb_unescape_string_utf8(const char *in_buf, int sz, char *out_buf) | |
{ | |
uint32_t ch; | |
char temp[4]; | |
const char *end; | |
const char *next; | |
int size; | |
int count_out = 0; | |
int count_in = 0; | |
int esc_in = 0; | |
int esc_out = 0; | |
end = in_buf + sz; | |
while (in_buf < end && *in_buf && count_in < sz) { | |
next = in_buf + 1; | |
if (next < end && *in_buf == '\\') { | |
esc_in = 2; | |
switch (*next) { | |
case '"': | |
ch = '"'; | |
break; | |
case '\'': | |
ch = '\''; | |
break; | |
case '\\': | |
ch = '\\'; | |
break; | |
case '/': | |
ch = '/'; | |
break; | |
case 'n': | |
ch = '\n'; | |
break; | |
case 'b': | |
ch = '\b'; | |
break; | |
case 't': | |
ch = '\t'; | |
break; | |
case 'f': | |
ch = '\f'; | |
break; | |
case 'r': | |
ch = '\r'; | |
break; | |
default: | |
size = end - next; | |
if (size > 0) { | |
esc_in = u8_read_escape_sequence(next, size, &ch) + 1; | |
} | |
else { | |
ch = (uint32_t) *in_buf; | |
esc_in = 1; | |
} | |
} | |
} | |
else { | |
ch = (uint32_t) *in_buf; | |
esc_in = 1; | |
} | |
in_buf += esc_in; | |
count_in += esc_in; | |
esc_out = u8_wc_toutf8(temp, ch); | |
if (esc_out > sz-count_out) { | |
printf("Crossing over string boundary"); | |
break; | |
} | |
if (esc_out == 0) { | |
out_buf[count_out] = ch; | |
esc_out = 1; | |
} | |
else if (esc_out == 1) { | |
out_buf[count_out] = (char) temp[0]; | |
} | |
else { | |
memcpy(&out_buf[count_out], temp, esc_out); | |
} | |
count_out += esc_out; | |
} | |
if (count_in < sz) { | |
printf("Not at boundary but still NULL terminating : %d - '%s'", sz, in_buf); | |
} | |
out_buf[count_out] = '\0'; | |
return count_out; | |
} | |
int main() { | |
unsigned char input[128] = "aaabbb"; | |
int size = strlen(input); | |
unsigned char output[128]; | |
input[0] = 0xe3; input[1] = 0x81; input[2] = 0x82; | |
input[3] = 0xe3; input[4] = 0x81; input[5] = 0x83; | |
flb_unescape_string_utf8(input, size, &output[0]); | |
fwrite(&input[0], size, 1, stdout); | |
puts("\n"); | |
fwrite(&output[0], strlen(output), 1, stdout); | |
puts("\n"); | |
} |
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