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
