1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size) {
30 lzma_stream s = LZMA_STREAM_INIT;
39 /* Returns false if we couldn't compress the data or the
40 * compressed result is longer than the original */
42 ret = lzma_easy_encoder(&s, LZMA_PRESET_DEFAULT, LZMA_CHECK_NONE);
47 s.avail_in = src_size;
49 s.avail_out = src_size;
52 if (lzma_code(&s, LZMA_FINISH) != LZMA_STREAM_END)
55 /* Is it actually shorter? */
59 *dst_size = src_size - s.avail_out;
68 bool uncompress_blob(const void *src, uint64_t src_size,
69 void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size) {
71 lzma_stream s = LZMA_STREAM_INIT;
78 assert(dst_alloc_size);
80 assert(*dst_alloc_size == 0 || *dst);
82 ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
86 if (*dst_alloc_size <= src_size) {
89 p = realloc(*dst, src_size*2);
94 *dst_alloc_size = src_size*2;
98 s.avail_in = src_size;
101 s.avail_out = *dst_alloc_size;
106 ret = lzma_code(&s, LZMA_FINISH);
108 if (ret == LZMA_STREAM_END)
114 p = realloc(*dst, *dst_alloc_size*2);
118 s.next_out = (uint8_t*) p + ((uint8_t*) s.next_out - (uint8_t*) *dst);
119 s.avail_out += *dst_alloc_size;
122 *dst_alloc_size *= 2;
125 *dst_size = *dst_alloc_size - s.avail_out;
134 bool uncompress_startswith(const void *src, uint64_t src_size,
135 void **buffer, uint64_t *buffer_size,
136 const void *prefix, uint64_t prefix_len,
139 lzma_stream s = LZMA_STREAM_INIT;
143 /* Checks whether the uncompressed blob starts with the
144 * mentioned prefix. The byte extra needs to follow the
148 assert(src_size > 0);
152 assert(*buffer_size == 0 || *buffer);
154 ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
158 if (*buffer_size <= prefix_len) {
161 p = realloc(*buffer, prefix_len*2);
166 *buffer_size = prefix_len*2;
170 s.avail_in = src_size;
172 s.next_out = *buffer;
173 s.avail_out = *buffer_size;
178 ret = lzma_code(&s, LZMA_FINISH);
180 if (ret != LZMA_STREAM_END && ret != LZMA_OK)
183 if ((*buffer_size - s.avail_out > prefix_len) &&
184 memcmp(*buffer, prefix, prefix_len) == 0 &&
185 ((const uint8_t*) *buffer)[prefix_len] == extra)
188 if (ret == LZMA_STREAM_END)
191 p = realloc(*buffer, *buffer_size*2);
195 s.next_out = (uint8_t*) p + ((uint8_t*) s.next_out - (uint8_t*) *buffer);
196 s.avail_out += *buffer_size;