xref: /PHP-7.4/ext/phar/phar_path_check.re (revision c245898b) 
1/*
2  +----------------------------------------------------------------------+
3  | phar php single-file executable PHP extension                        |
4  +----------------------------------------------------------------------+
5  | Copyright (c) The PHP Group                                          |
6  +----------------------------------------------------------------------+
7  | This source file is subject to version 3.01 of the PHP license,      |
8  | that is bundled with this package in the file LICENSE, and is        |
9  | available through the world-wide-web at the following url:           |
10  | http://www.php.net/license/3_01.txt.                                 |
11  | If you did not receive a copy of the PHP license and are unable to   |
12  | obtain it through the world-wide-web, please send a note to          |
13  | license@php.net so we can mail you a copy immediately.               |
14  +----------------------------------------------------------------------+
15  | Authors: Marcus Boerger <helly@php.net>                              |
16  +----------------------------------------------------------------------+
17*/
18
19#include "phar_internal.h"
20
21phar_path_check_result phar_path_check(char **s, size_t *len, const char **error)
22{
23	const unsigned char *p = (const unsigned char*)*s;
24	const unsigned char *m;
25
26	if (*len == 1 && *p == '.') {
27		*error = "current directory reference";
28		return pcr_err_curr_dir;
29	} else if (*len == 2 && p[0] == '.' && p[1] == '.') {
30		*error = "upper directory reference";
31		return pcr_err_up_dir;
32	}
33
34#define YYCTYPE         unsigned char
35#define YYCURSOR        p
36#define YYLIMIT         p+*len
37#define YYMARKER        m
38#define YYFILL(n)
39
40loop:
41/*!re2c
42END     = "\x00";
43NEWLINE = "\r"? "\n";
44UTF8T   = [\x80-\xBF] ;
45UTF8_1  = [\x1A-\x7F] ;
46UTF8_2  = [\xC2-\xDF] UTF8T ;
47UTF8_3A = "\xE0" [\xA0-\xBF] UTF8T ;
48UTF8_3B = [\xE1-\xEC] UTF8T{2} ;
49UTF8_3C = "\xED" [\x80-\x9F] UTF8T ;
50UTF8_3D = [\xEE-\xEF] UTF8T{2} ;
51UTF8_3  = UTF8_3A | UTF8_3B | UTF8_3C | UTF8_3D ;
52UTF8_4A = "\xF0"[\x90-\xBF] UTF8T{2} ;
53UTF8_4B = [\xF1-\xF3] UTF8T{3} ;
54UTF8_4C = "\xF4" [\x80-\x8F] UTF8T{2} ;
55UTF8_4  = UTF8_4A | UTF8_4B | UTF8_4C ;
56UTF8    = UTF8_1 | UTF8_2 | UTF8_3 | UTF8_4 ;
57EOS     = "/" | END;
58ANY     = . | NEWLINE;
59
60"//" 	{
61			*error = "double slash";
62			return pcr_err_double_slash;
63		}
64"/.." EOS {
65			*error = "upper directory reference";
66			return pcr_err_up_dir;
67		}
68"/." EOS {
69			*error = "current directory reference";
70			return pcr_err_curr_dir;
71		}
72"\\" {
73			*error = "back-slash";
74			return pcr_err_back_slash;
75		}
76"*" {
77			*error = "star";
78			return pcr_err_star;
79		}
80"?"	{
81			if (**s == '/') {
82				(*s)++;
83			}
84			*len = (p - (const unsigned char*)*s) -1;
85			*error = NULL;
86			return pcr_use_query;
87		}
88UTF8 {
89			goto loop;
90		}
91END {
92			if (**s == '/') {
93				(*s)++;
94				(*len)--;
95			}
96			if ((p - (const unsigned char*)*s) - 1 != *len)
97			{
98				*error ="illegal character";
99				return pcr_err_illegal_char;
100			}
101			*error = NULL;
102			return pcr_is_ok;
103		}
104ANY {
105			*error ="illegal character";
106			return pcr_err_illegal_char;
107		}
108*/
109}
110