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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size) {
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lzma_stream s = LZMA_STREAM_INIT;
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/* Returns false if we couldn't compress the data or the
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* compressed result is longer than the original */
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ret = lzma_easy_encoder(&s, LZMA_PRESET_DEFAULT, LZMA_CHECK_NONE);
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s.avail_in = src_size;
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s.avail_out = src_size;
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if (lzma_code(&s, LZMA_FINISH) != LZMA_STREAM_END)
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/* Is it actually shorter? */
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*dst_size = src_size - s.avail_out;
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bool uncompress_blob(const void *src, uint64_t src_size,
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void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size) {
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lzma_stream s = LZMA_STREAM_INIT;
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assert(dst_alloc_size);
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assert(*dst_alloc_size == 0 || *dst);
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ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
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if (*dst_alloc_size <= src_size) {
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p = realloc(*dst, src_size*2);
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*dst_alloc_size = src_size*2;
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s.avail_in = src_size;
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s.avail_out = *dst_alloc_size;
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ret = lzma_code(&s, LZMA_FINISH);
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if (ret == LZMA_STREAM_END)
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p = realloc(*dst, *dst_alloc_size*2);
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s.next_out = (uint8_t*) p + ((uint8_t*) s.next_out - (uint8_t*) *dst);
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s.avail_out += *dst_alloc_size;
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*dst_alloc_size *= 2;
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*dst_size = *dst_alloc_size - s.avail_out;
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bool uncompress_startswith(const void *src, uint64_t src_size,
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void **buffer, uint64_t *buffer_size,
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const void *prefix, uint64_t prefix_len,
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lzma_stream s = LZMA_STREAM_INIT;
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/* Checks whether the uncompressed blob starts with the
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* mentioned prefix. The byte extra needs to follow the
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assert(src_size > 0);
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assert(*buffer_size == 0 || *buffer);
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ret = lzma_stream_decoder(&s, UINT64_MAX, 0);
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if (*buffer_size <= prefix_len) {
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p = realloc(*buffer, prefix_len*2);
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*buffer_size = prefix_len*2;
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s.avail_in = src_size;
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s.next_out = *buffer;
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s.avail_out = *buffer_size;
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ret = lzma_code(&s, LZMA_FINISH);
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if (ret != LZMA_STREAM_END && ret != LZMA_OK)
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if ((*buffer_size - s.avail_out > prefix_len) &&
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memcmp(*buffer, prefix, prefix_len) == 0 &&
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((const uint8_t*) *buffer)[prefix_len] == extra)
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if (ret == LZMA_STREAM_END)
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p = realloc(*buffer, *buffer_size*2);
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s.next_out = (uint8_t*) p + ((uint8_t*) s.next_out - (uint8_t*) *buffer);
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s.avail_out += *buffer_size;