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) {
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) {
135 if (_zip_buffer_left(buffer) < length) {
136 length = _zip_buffer_left(buffer);
139 memcpy(data, _zip_buffer_get(buffer, length), length);
146 _zip_buffer_new(zip_uint8_t *data, zip_uint64_t size) {
147 bool free_data = (data == NULL);
148 zip_buffer_t *buffer;
151 if ((data = (zip_uint8_t *)malloc(size)) == NULL) {
156 if ((buffer = (zip_buffer_t *)malloc(sizeof(*buffer))) == NULL) {
167 buffer->free_data = free_data;
174 _zip_buffer_new_from_source(zip_source_t *src, zip_uint64_t size, zip_uint8_t *buf, zip_error_t *error) {
175 zip_buffer_t *buffer;
177 if ((buffer = _zip_buffer_new(buf, size)) == NULL) {
178 zip_error_set(error, ZIP_ER_MEMORY, 0);
182 if (_zip_read(src, buffer->data, size, error) < 0) {
183 _zip_buffer_free(buffer);
192 _zip_buffer_offset(zip_buffer_t *buffer) {
193 return buffer->ok ? buffer->offset : 0;
198 _zip_buffer_ok(zip_buffer_t *buffer) {
204 _zip_buffer_peek(zip_buffer_t *buffer, zip_uint64_t length) {
207 if (!buffer->ok || buffer->offset + length < length || buffer->offset + length > buffer->size) {
212 data = buffer->data + buffer->offset;
217 _zip_buffer_put(zip_buffer_t *buffer, const void *src, size_t length) {
218 zip_uint8_t *dst = _zip_buffer_get(buffer, length);
224 memcpy(dst, src, length);
230 _zip_buffer_put_16(zip_buffer_t *buffer, zip_uint16_t i) {
231 zip_uint8_t *data = _zip_buffer_get(buffer, 2);
237 data[0] = (zip_uint8_t)(i & 0xff);
238 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
245 _zip_buffer_put_32(zip_buffer_t *buffer, zip_uint32_t i) {
246 zip_uint8_t *data = _zip_buffer_get(buffer, 4);
252 data[0] = (zip_uint8_t)(i & 0xff);
253 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
254 data[2] = (zip_uint8_t)((i >> 16) & 0xff);
255 data[3] = (zip_uint8_t)((i >> 24) & 0xff);
262 _zip_buffer_put_64(zip_buffer_t *buffer, zip_uint64_t i) {
263 zip_uint8_t *data = _zip_buffer_get(buffer, 8);
269 data[0] = (zip_uint8_t)(i & 0xff);
270 data[1] = (zip_uint8_t)((i >> 8) & 0xff);
271 data[2] = (zip_uint8_t)((i >> 16) & 0xff);
272 data[3] = (zip_uint8_t)((i >> 24) & 0xff);
273 data[4] = (zip_uint8_t)((i >> 32) & 0xff);
274 data[5] = (zip_uint8_t)((i >> 40) & 0xff);
275 data[6] = (zip_uint8_t)((i >> 48) & 0xff);
276 data[7] = (zip_uint8_t)((i >> 56) & 0xff);
283 _zip_buffer_put_8(zip_buffer_t *buffer, zip_uint8_t i) {
284 zip_uint8_t *data = _zip_buffer_get(buffer, 1);
297 _zip_buffer_set_offset(zip_buffer_t *buffer, zip_uint64_t offset) {
298 if (offset > buffer->size) {
304 buffer->offset = offset;
311 _zip_buffer_skip(zip_buffer_t *buffer, zip_uint64_t length) {
312 zip_uint64_t offset = buffer->offset + length;
314 if (offset < buffer->offset) {
318 return _zip_buffer_set_offset(buffer, offset);
322 _zip_buffer_size(zip_buffer_t *buffer) {