2 zip_buffer.c -- bounds checked access to memory buffer
3 Copyright (C) 2014-2021 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 <info@libzip.org>
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) {
46 _zip_buffer_free(zip_buffer_t *buffer) {
51 if (buffer->free_data) {
60 _zip_buffer_eof(zip_buffer_t *buffer) {
61 return buffer->ok && buffer->offset == buffer->size;
66 _zip_buffer_get(zip_buffer_t *buffer, zip_uint64_t length) {
69 data = _zip_buffer_peek(buffer, length);
72 buffer->offset += length;
80 _zip_buffer_get_16(zip_buffer_t *buffer) {
81 zip_uint8_t *data = _zip_buffer_get(buffer, 2);
87 return (zip_uint16_t)(data[0] + (data[1] << 8));
92 _zip_buffer_get_32(zip_buffer_t *buffer) {
93 zip_uint8_t *data = _zip_buffer_get(buffer, 4);
99 return ((((((zip_uint32_t)data[3] << 8) + data[2]) << 8) + data[1]) << 8) + data[0];
104 _zip_buffer_get_64(zip_buffer_t *buffer) {
105 zip_uint8_t *data = _zip_buffer_get(buffer, 8);
111 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];
116 _zip_buffer_get_8(zip_buffer_t *buffer) {
117 zip_uint8_t *data = _zip_buffer_get(buffer, 1);
128 _zip_buffer_left(zip_buffer_t *buffer) {
129 return buffer->ok ? buffer->size - buffer->offset : 0;
134 _zip_buffer_read(zip_buffer_t *buffer, zip_uint8_t *data, zip_uint64_t length) {
137 if (_zip_buffer_left(buffer) < length) {
138 length = _zip_buffer_left(buffer);
142 while (copied < length) {
143 size_t n = ZIP_MIN(length - copied, SIZE_MAX);
144 (void)memcpy_s(data + copied, n, _zip_buffer_get(buffer, n), n);
153 _zip_buffer_new(zip_uint8_t *data, zip_uint64_t size) {
154 bool free_data = (data == NULL);
155 zip_buffer_t *buffer;
157 #if ZIP_UINT64_MAX > SIZE_MAX
158 if (size > SIZE_MAX) {
164 if ((data = (zip_uint8_t *)malloc((size_t)size)) == NULL) {
169 if ((buffer = (zip_buffer_t *)malloc(sizeof(*buffer))) == NULL) {
180 buffer->free_data = free_data;
187 _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) {
206 return buffer->ok ? buffer->offset : 0;
211 _zip_buffer_ok(zip_buffer_t *buffer) {
217 _zip_buffer_peek(zip_buffer_t *buffer, zip_uint64_t length) {
220 if (!buffer->ok || buffer->offset + length < length || buffer->offset + length > buffer->size) {
225 data = buffer->data + buffer->offset;
230 _zip_buffer_put(zip_buffer_t *buffer, const void *src, size_t length) {
231 zip_uint8_t *dst = _zip_buffer_get(buffer, length);
237 (void)memcpy_s(dst, length, src, length);
243 _zip_buffer_put_16(zip_buffer_t *buffer, zip_uint16_t i) {
244 zip_uint8_t *data = _zip_buffer_get(buffer, 2);
250 data[0] = (zip_uint8_t)(i & 0xff);
251 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
258 _zip_buffer_put_32(zip_buffer_t *buffer, zip_uint32_t i) {
259 zip_uint8_t *data = _zip_buffer_get(buffer, 4);
265 data[0] = (zip_uint8_t)(i & 0xff);
266 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
267 data[2] = (zip_uint8_t)((i >> 16) & 0xff);
268 data[3] = (zip_uint8_t)((i >> 24) & 0xff);
275 _zip_buffer_put_64(zip_buffer_t *buffer, zip_uint64_t i) {
276 zip_uint8_t *data = _zip_buffer_get(buffer, 8);
282 data[0] = (zip_uint8_t)(i & 0xff);
283 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
284 data[2] = (zip_uint8_t)((i >> 16) & 0xff);
285 data[3] = (zip_uint8_t)((i >> 24) & 0xff);
286 data[4] = (zip_uint8_t)((i >> 32) & 0xff);
287 data[5] = (zip_uint8_t)((i >> 40) & 0xff);
288 data[6] = (zip_uint8_t)((i >> 48) & 0xff);
289 data[7] = (zip_uint8_t)((i >> 56) & 0xff);
296 _zip_buffer_put_8(zip_buffer_t *buffer, zip_uint8_t i) {
297 zip_uint8_t *data = _zip_buffer_get(buffer, 1);
310 _zip_buffer_set_offset(zip_buffer_t *buffer, zip_uint64_t offset) {
311 if (offset > buffer->size) {
317 buffer->offset = offset;
324 _zip_buffer_skip(zip_buffer_t *buffer, zip_uint64_t length) {
325 zip_uint64_t offset = buffer->offset + length;
327 if (offset < buffer->offset) {
331 return _zip_buffer_set_offset(buffer, offset);
335 _zip_buffer_size(zip_buffer_t *buffer) {