journal/compress: return early in uncompress_startswith

[thirdparty/systemd.git] / src / journal / compress.h

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

#pragma once

/***
  This file is part of systemd.

  Copyright 2011 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <inttypes.h>
#include <stdbool.h>
#include <unistd.h>

bool compress_blob(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size);

bool uncompress_blob(const void *src, uint64_t src_size,
                     void **dst, uint64_t *dst_alloc_size, uint64_t* dst_size, uint64_t dst_max);

bool uncompress_startswith(const void *src, uint64_t src_size,
                           void **buffer, uint64_t *buffer_size,
                           const void *prefix, uint64_t prefix_len,
                           uint8_t extra);

int compress_stream(int fdf, int fdt, uint32_t preset, off_t max_size);
int decompress_stream(int fdf, int fdt, off_t max_size);