2 zip_buffer.c -- bounds checked access to memory buffer
3 Copyright (C) 2014-2016 Dieter Baron and Thomas Klausner
5 This file is part of libzip, a library to manipulate ZIP archives.
6 The authors can be contacted at <libzip@nih.at>
8 Redistribution and use in source and binary forms, with or without
9 modification, are permitted provided that the following conditions
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
17 3. The names of the authors may not be used to endorse or promote
18 products derived from this software without specific prior
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.
40 _zip_buffer_data(zip_buffer_t *buffer)
47 _zip_buffer_free(zip_buffer_t *buffer)
53 if (buffer->free_data) {
62 _zip_buffer_eof(zip_buffer_t *buffer)
64 return buffer->ok && buffer->offset == buffer->size;
69 _zip_buffer_get(zip_buffer_t *buffer, zip_uint64_t length)
73 data = _zip_buffer_peek(buffer, length);
76 buffer->offset += length;
84 _zip_buffer_get_16(zip_buffer_t *buffer)
86 zip_uint8_t *data = _zip_buffer_get(buffer, 2);
92 return (zip_uint16_t)(data[0] + (data[1] << 8));
97 _zip_buffer_get_32(zip_buffer_t *buffer)
99 zip_uint8_t *data = _zip_buffer_get(buffer, 4);
105 return ((((((zip_uint32_t)data[3] << 8) + data[2]) << 8) + data[1]) << 8) + data[0];
110 _zip_buffer_get_64(zip_buffer_t *buffer)
112 zip_uint8_t *data = _zip_buffer_get(buffer, 8);
118 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];
124 _zip_buffer_get_8(zip_buffer_t *buffer)
126 zip_uint8_t *data = _zip_buffer_get(buffer, 1);
137 _zip_buffer_left(zip_buffer_t *buffer)
139 return buffer->ok ? buffer->size - buffer->offset : 0;
144 _zip_buffer_read(zip_buffer_t *buffer, zip_uint8_t *data, zip_uint64_t length)
146 if (_zip_buffer_left(buffer) < length) {
147 length = _zip_buffer_left(buffer);
150 memcpy(data, _zip_buffer_get(buffer, length), length);
157 _zip_buffer_new(zip_uint8_t *data, zip_uint64_t size)
159 bool free_data = (data == NULL);
160 zip_buffer_t *buffer;
163 if ((data = (zip_uint8_t *)malloc(size)) == NULL) {
168 if ((buffer = (zip_buffer_t *)malloc(sizeof(*buffer))) == NULL) {
179 buffer->free_data = free_data;
186 _zip_buffer_new_from_source(zip_source_t *src, zip_uint64_t size, zip_uint8_t *buf, zip_error_t *error)
188 zip_buffer_t *buffer;
190 if ((buffer = _zip_buffer_new(buf, size)) == NULL) {
191 zip_error_set(error, ZIP_ER_MEMORY, 0);
195 if (_zip_read(src, buffer->data, size, error) < 0) {
196 _zip_buffer_free(buffer);
205 _zip_buffer_offset(zip_buffer_t *buffer)
207 return buffer->ok ? buffer->offset : 0;
212 _zip_buffer_ok(zip_buffer_t *buffer)
220 _zip_buffer_peek(zip_buffer_t *buffer, zip_uint64_t length)
224 if (!buffer->ok || buffer->offset + length < length || buffer->offset + length > buffer->size) {
229 data = buffer->data + buffer->offset;
234 _zip_buffer_put(zip_buffer_t *buffer, const void *src, size_t length)
236 zip_uint8_t *dst = _zip_buffer_get(buffer, length);
242 memcpy(dst, src, length);
248 _zip_buffer_put_16(zip_buffer_t *buffer, zip_uint16_t i)
250 zip_uint8_t *data = _zip_buffer_get(buffer, 2);
256 data[0] = (zip_uint8_t)(i & 0xff);
257 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
264 _zip_buffer_put_32(zip_buffer_t *buffer, zip_uint32_t i)
266 zip_uint8_t *data = _zip_buffer_get(buffer, 4);
272 data[0] = (zip_uint8_t)(i & 0xff);
273 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
274 data[2] = (zip_uint8_t)((i >> 16) & 0xff);
275 data[3] = (zip_uint8_t)((i >> 24) & 0xff);
282 _zip_buffer_put_64(zip_buffer_t *buffer, zip_uint64_t i)
284 zip_uint8_t *data = _zip_buffer_get(buffer, 8);
290 data[0] = (zip_uint8_t)(i & 0xff);
291 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
292 data[2] = (zip_uint8_t)((i >> 16) & 0xff);
293 data[3] = (zip_uint8_t)((i >> 24) & 0xff);
294 data[4] = (zip_uint8_t)((i >> 32) & 0xff);
295 data[5] = (zip_uint8_t)((i >> 40) & 0xff);
296 data[6] = (zip_uint8_t)((i >> 48) & 0xff);
297 data[7] = (zip_uint8_t)((i >> 56) & 0xff);
304 _zip_buffer_put_8(zip_buffer_t *buffer, zip_uint8_t i)
306 zip_uint8_t *data = _zip_buffer_get(buffer, 1);
319 _zip_buffer_set_offset(zip_buffer_t *buffer, zip_uint64_t offset)
321 if (offset > buffer->size) {
327 buffer->offset = offset;
334 _zip_buffer_skip(zip_buffer_t *buffer, zip_uint64_t length) {
335 zip_uint64_t offset = buffer->offset + length;
337 if (offset < buffer->offset) {
341 return _zip_buffer_set_offset(buffer, offset);
345 _zip_buffer_size(zip_buffer_t *buffer)