xref: /PHP-7.3/ext/zip/lib/zip_string.c (revision 64002648)
1 /*
2   zip_string.c -- string handling (with encoding)
3   Copyright (C) 2012-2014 Dieter Baron and Thomas Klausner
4 
5   This file is part of libzip, a library to manipulate ZIP archives.
6   The authors can be contacted at <libzip@nih.at>
7 
8   Redistribution and use in source and binary forms, with or without
9   modification, are permitted provided that the following conditions
10   are met:
11   1. Redistributions of source code must retain the above copyright
12      notice, this list of conditions and the following disclaimer.
13   2. Redistributions in binary form must reproduce the above copyright
14      notice, this list of conditions and the following disclaimer in
15      the documentation and/or other materials provided with the
16      distribution.
17   3. The names of the authors may not be used to endorse or promote
18      products derived from this software without specific prior
19      written permission.
20 
21   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33 
34 
35 #include <stdlib.h>
36 #include <string.h>
37 
38 #include "zipint.h"
39 
40 
41 zip_uint32_t
_zip_string_crc32(const zip_string_t * s)42 _zip_string_crc32(const zip_string_t *s)
43 {
44     zip_uint32_t crc;
45 
46     crc = (zip_uint32_t)crc32(0L, Z_NULL, 0);
47 
48     if (s != NULL)
49 	crc = (zip_uint32_t)crc32(crc, s->raw, s->length);
50 
51     return crc;
52 }
53 
54 
55 int
_zip_string_equal(const zip_string_t * a,const zip_string_t * b)56 _zip_string_equal(const zip_string_t *a, const zip_string_t *b)
57 {
58     if (a == NULL || b == NULL)
59 	return a == b;
60 
61     if (a->length != b->length)
62 	return 0;
63 
64     /* TODO: encoding */
65 
66     return (memcmp(a->raw, b->raw, a->length) == 0);
67 }
68 
69 
70 void
_zip_string_free(zip_string_t * s)71 _zip_string_free(zip_string_t *s)
72 {
73     if (s == NULL)
74 	return;
75 
76     free(s->raw);
77     free(s->converted);
78     free(s);
79 }
80 
81 
82 const zip_uint8_t *
_zip_string_get(zip_string_t * string,zip_uint32_t * lenp,zip_flags_t flags,zip_error_t * error)83 _zip_string_get(zip_string_t *string, zip_uint32_t *lenp, zip_flags_t flags, zip_error_t *error)
84 {
85     static const zip_uint8_t empty[1] = "";
86 
87     if (string == NULL) {
88 	if (lenp)
89 	    *lenp = 0;
90 	return empty;
91     }
92 
93     if ((flags & ZIP_FL_ENC_RAW) == 0) {
94 	/* start guessing */
95 	if (string->encoding == ZIP_ENCODING_UNKNOWN)
96 	    _zip_guess_encoding(string, ZIP_ENCODING_UNKNOWN);
97 
98 	if (((flags & ZIP_FL_ENC_STRICT)
99 	     && string->encoding != ZIP_ENCODING_ASCII && string->encoding != ZIP_ENCODING_UTF8_KNOWN)
100 	    || (string->encoding == ZIP_ENCODING_CP437)) {
101 	    if (string->converted == NULL) {
102 		if ((string->converted=_zip_cp437_to_utf8(string->raw, string->length,
103 							  &string->converted_length, error)) == NULL)
104 		    return NULL;
105 	    }
106 	    if (lenp)
107 		*lenp = string->converted_length;
108 	    return string->converted;
109 	}
110     }
111 
112     if (lenp)
113 	*lenp = string->length;
114     return string->raw;
115 }
116 
117 
118 zip_uint16_t
_zip_string_length(const zip_string_t * s)119 _zip_string_length(const zip_string_t *s)
120 {
121     if (s == NULL)
122 	return 0;
123 
124     return s->length;
125 }
126 
127 
128 zip_string_t *
_zip_string_new(const zip_uint8_t * raw,zip_uint16_t length,zip_flags_t flags,zip_error_t * error)129 _zip_string_new(const zip_uint8_t *raw, zip_uint16_t length, zip_flags_t flags, zip_error_t *error)
130 {
131     zip_string_t *s;
132     zip_encoding_type_t expected_encoding;
133 
134     if (length == 0)
135 	return NULL;
136 
137     switch (flags & ZIP_FL_ENCODING_ALL) {
138     case ZIP_FL_ENC_GUESS:
139 	expected_encoding = ZIP_ENCODING_UNKNOWN;
140 	break;
141     case ZIP_FL_ENC_UTF_8:
142 	expected_encoding = ZIP_ENCODING_UTF8_KNOWN;
143 	break;
144     case ZIP_FL_ENC_CP437:
145 	expected_encoding = ZIP_ENCODING_CP437;
146 	break;
147     default:
148 	zip_error_set(error, ZIP_ER_INVAL, 0);
149 	return NULL;
150     }
151 
152     if ((s=(zip_string_t *)malloc(sizeof(*s))) == NULL) {
153 	zip_error_set(error, ZIP_ER_MEMORY, 0);
154 	return NULL;
155     }
156 
157     if ((s->raw=(zip_uint8_t *)malloc((size_t)(length+1))) == NULL) {
158 	free(s);
159 	return NULL;
160     }
161 
162     memcpy(s->raw, raw, length);
163     s->raw[length] = '\0';
164     s->length = length;
165     s->encoding = ZIP_ENCODING_UNKNOWN;
166     s->converted = NULL;
167     s->converted_length = 0;
168 
169     if (expected_encoding != ZIP_ENCODING_UNKNOWN) {
170 	if (_zip_guess_encoding(s, expected_encoding) == ZIP_ENCODING_ERROR) {
171 	    _zip_string_free(s);
172 	    zip_error_set(error, ZIP_ER_INVAL, 0);
173 	    return NULL;
174 	}
175     }
176 
177     return s;
178 }
179 
180 
181 int
_zip_string_write(zip_t * za,const zip_string_t * s)182 _zip_string_write(zip_t *za, const zip_string_t *s)
183 {
184     if (s == NULL)
185 	return 0;
186 
187     return _zip_write(za, s->raw, s->length);
188 }
189