xref: /PHP-7.3/ext/zip/lib/zip_buffer.c (revision 64002648)
1 /*
2  zip_buffer.c -- bounds checked access to memory buffer
3  Copyright (C) 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 #include <stdlib.h>
35 #include <string.h>
36 
37 #include "zipint.h"
38 
39 zip_uint8_t *
_zip_buffer_data(zip_buffer_t * buffer)40 _zip_buffer_data(zip_buffer_t *buffer)
41 {
42     return buffer->data;
43 }
44 
45 
46 void
_zip_buffer_free(zip_buffer_t * buffer)47 _zip_buffer_free(zip_buffer_t *buffer)
48 {
49     if (buffer == NULL) {
50         return;
51     }
52 
53     if (buffer->free_data) {
54         free(buffer->data);
55     }
56 
57     free(buffer);
58 }
59 
60 
61 bool
_zip_buffer_eof(zip_buffer_t * buffer)62 _zip_buffer_eof(zip_buffer_t *buffer)
63 {
64     return buffer->ok && buffer->offset == buffer->size;
65 }
66 
67 
68 zip_uint8_t *
_zip_buffer_get(zip_buffer_t * buffer,zip_uint64_t length)69 _zip_buffer_get(zip_buffer_t *buffer, zip_uint64_t length)
70 {
71     zip_uint8_t *data;
72 
73     if (!buffer->ok || buffer->offset + length < length || buffer->offset + length > buffer->size) {
74         buffer->ok = false;
75         return NULL;
76     }
77 
78     data = buffer->data + buffer->offset;
79     buffer->offset += length;
80     return data;
81 }
82 
83 
84 zip_uint16_t
_zip_buffer_get_16(zip_buffer_t * buffer)85 _zip_buffer_get_16(zip_buffer_t *buffer)
86 {
87     zip_uint8_t *data = _zip_buffer_get(buffer, 2);
88 
89     if (data == NULL) {
90         return 0;
91     }
92 
93     return (zip_uint16_t)(data[0] + (data[1] << 8));
94 }
95 
96 
97 zip_uint32_t
_zip_buffer_get_32(zip_buffer_t * buffer)98 _zip_buffer_get_32(zip_buffer_t *buffer)
99 {
100     zip_uint8_t *data = _zip_buffer_get(buffer, 4);
101 
102     if (data == NULL) {
103         return 0;
104     }
105 
106     return ((((((zip_uint32_t)data[3] << 8) + data[2]) << 8) + data[1]) << 8) + data[0];
107 }
108 
109 
110 zip_uint64_t
_zip_buffer_get_64(zip_buffer_t * buffer)111 _zip_buffer_get_64(zip_buffer_t *buffer)
112 {
113     zip_uint8_t *data = _zip_buffer_get(buffer, 8);
114 
115     if (data == NULL) {
116         return 0;
117     }
118 
119     return ((zip_uint64_t)data[7] << 56) + ((zip_uint64_t)data[6] << 48) + ((zip_uint64_t)data[5] << 40) + ((zip_uint64_t)data[4] << 32) + ((zip_uint64_t)data[3] << 24) + ((zip_uint64_t)data[2] << 16) + ((zip_uint64_t)data[1] << 8) + (zip_uint64_t)data[0];
120 }
121 
122 
123 
124 zip_uint8_t
_zip_buffer_get_8(zip_buffer_t * buffer)125 _zip_buffer_get_8(zip_buffer_t *buffer)
126 {
127     zip_uint8_t *data = _zip_buffer_get(buffer, 1);
128 
129     if (data == NULL) {
130         return 0;
131     }
132 
133     return data[0];
134 }
135 
136 
137 zip_uint64_t
_zip_buffer_left(zip_buffer_t * buffer)138 _zip_buffer_left(zip_buffer_t *buffer)
139 {
140     return buffer->ok ? buffer->size - buffer->offset : 0;
141 }
142 
143 
144 zip_buffer_t *
_zip_buffer_new(zip_uint8_t * data,zip_uint64_t size)145 _zip_buffer_new(zip_uint8_t *data, zip_uint64_t size)
146 {
147     bool free_data = (data == NULL);
148     zip_buffer_t *buffer;
149 
150     if (data == NULL) {
151         if ((data = (zip_uint8_t *)malloc(size)) == NULL) {
152             return NULL;
153         }
154     }
155 
156     if ((buffer = (zip_buffer_t *)malloc(sizeof(*buffer))) == NULL) {
157         if (free_data) {
158             free(data);
159         }
160         return NULL;
161     }
162 
163     buffer->ok = true;
164     buffer->data = data;
165     buffer->size = size;
166     buffer->offset = 0;
167     buffer->free_data = free_data;
168 
169     return buffer;
170 }
171 
172 
173 zip_buffer_t *
_zip_buffer_new_from_source(zip_source_t * src,zip_uint64_t size,zip_uint8_t * buf,zip_error_t * error)174 _zip_buffer_new_from_source(zip_source_t *src, zip_uint64_t size, zip_uint8_t *buf, zip_error_t *error)
175 {
176     zip_buffer_t *buffer;
177 
178     if ((buffer = _zip_buffer_new(buf, size)) == NULL) {
179         zip_error_set(error, ZIP_ER_MEMORY, 0);
180         return NULL;
181     }
182 
183     if (_zip_read(src, buffer->data, size, error) < 0) {
184         _zip_buffer_free(buffer);
185         return NULL;
186     }
187 
188     return buffer;
189 }
190 
191 
192 zip_uint64_t
_zip_buffer_offset(zip_buffer_t * buffer)193 _zip_buffer_offset(zip_buffer_t *buffer)
194 {
195     return buffer->ok ? buffer->offset : 0;
196 }
197 
198 
199 bool
_zip_buffer_ok(zip_buffer_t * buffer)200 _zip_buffer_ok(zip_buffer_t *buffer)
201 {
202     return buffer->ok;
203 }
204 
205 
206 int
_zip_buffer_put(zip_buffer_t * buffer,const void * src,size_t length)207 _zip_buffer_put(zip_buffer_t *buffer, const void *src, size_t length)
208 {
209     zip_uint8_t *dst = _zip_buffer_get(buffer, length);
210 
211     if (dst == NULL) {
212         return -1;
213     }
214 
215     memcpy(dst, src, length);
216     return 0;
217 }
218 
219 
220 int
_zip_buffer_put_16(zip_buffer_t * buffer,zip_uint16_t i)221 _zip_buffer_put_16(zip_buffer_t *buffer, zip_uint16_t i)
222 {
223     zip_uint8_t *data = _zip_buffer_get(buffer, 2);
224 
225     if (data == NULL) {
226         return -1;
227     }
228 
229     data[0] = (zip_uint8_t)(i & 0xff);
230     data[1] = (zip_uint8_t)((i >> 8) & 0xff);
231 
232     return 0;
233 }
234 
235 
236 int
_zip_buffer_put_32(zip_buffer_t * buffer,zip_uint32_t i)237 _zip_buffer_put_32(zip_buffer_t *buffer, zip_uint32_t i)
238 {
239     zip_uint8_t *data = _zip_buffer_get(buffer, 4);
240 
241     if (data == NULL) {
242         return -1;
243     }
244 
245     data[0] = (zip_uint8_t)(i & 0xff);
246     data[1] = (zip_uint8_t)((i >> 8) & 0xff);
247     data[2] = (zip_uint8_t)((i >> 16) & 0xff);
248     data[3] = (zip_uint8_t)((i >> 24) & 0xff);
249 
250     return 0;
251 }
252 
253 
254 int
_zip_buffer_put_64(zip_buffer_t * buffer,zip_uint64_t i)255 _zip_buffer_put_64(zip_buffer_t *buffer, zip_uint64_t i)
256 {
257     zip_uint8_t *data = _zip_buffer_get(buffer, 8);
258 
259     if (data == NULL) {
260         return -1;
261     }
262 
263     data[0] = (zip_uint8_t)(i & 0xff);
264     data[1] = (zip_uint8_t)((i >> 8) & 0xff);
265     data[2] = (zip_uint8_t)((i >> 16) & 0xff);
266     data[3] = (zip_uint8_t)((i >> 24) & 0xff);
267     data[4] = (zip_uint8_t)((i >> 32) & 0xff);
268     data[5] = (zip_uint8_t)((i >> 40) & 0xff);
269     data[6] = (zip_uint8_t)((i >> 48) & 0xff);
270     data[7] = (zip_uint8_t)((i >> 56) & 0xff);
271 
272     return 0;
273 }
274 
275 
276 int
_zip_buffer_put_8(zip_buffer_t * buffer,zip_uint8_t i)277 _zip_buffer_put_8(zip_buffer_t *buffer, zip_uint8_t i)
278 {
279     zip_uint8_t *data = _zip_buffer_get(buffer, 1);
280 
281     if (data == NULL) {
282         return -1;
283     }
284 
285     data[0] = i;
286 
287     return 0;
288 }
289 
290 
291 int
_zip_buffer_set_offset(zip_buffer_t * buffer,zip_uint64_t offset)292 _zip_buffer_set_offset(zip_buffer_t *buffer, zip_uint64_t offset)
293 {
294     if (offset > buffer->size) {
295         buffer->ok = false;
296         return -1;
297     }
298 
299     buffer->ok = true;
300     buffer->offset = offset;
301 
302     return 0;
303 }
304 
305 
306 int
_zip_buffer_skip(zip_buffer_t * buffer,zip_uint64_t length)307 _zip_buffer_skip(zip_buffer_t *buffer, zip_uint64_t length) {
308     zip_uint64_t offset = buffer->offset + length;
309 
310     if (offset < buffer->offset) {
311         buffer->ok = false;
312         return -1;
313     }
314     return _zip_buffer_set_offset(buffer, offset);
315 }
316 
317 zip_uint64_t
_zip_buffer_size(zip_buffer_t * buffer)318 _zip_buffer_size(zip_buffer_t *buffer)
319 {
320     return buffer->size;
321 }
322