compress.h revision 5d6f46b6bf7804af8c1ba780f72a37dc37193428
/*-*- 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 <unistd.h>
#include "journal-def.h"
const char* object_compressed_to_string(int compression);
int object_compressed_from_string(const char *compression);
int compress_blob_xz(const void *src, uint64_t src_size,
void *dst, size_t dst_alloc_size, size_t *dst_size);
int compress_blob_lz4(const void *src, uint64_t src_size,
void *dst, size_t dst_alloc_size, size_t *dst_size);
static inline int compress_blob(const void *src, uint64_t src_size,
void *dst, size_t dst_alloc_size, size_t *dst_size) {
int r;
#ifdef HAVE_LZ4
r = compress_blob_lz4(src, src_size, dst, dst_alloc_size, dst_size);
if (r == 0)
return OBJECT_COMPRESSED_LZ4;
#else
r = compress_blob_xz(src, src_size, dst, dst_alloc_size, dst_size);
if (r == 0)
return OBJECT_COMPRESSED_XZ;
#endif
return r;
}
int decompress_blob_xz(const void *src, uint64_t src_size,
void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max);
int decompress_blob_lz4(const void *src, uint64_t src_size,
void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max);
int decompress_blob(int compression,
const void *src, uint64_t src_size,
void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max);
int decompress_startswith_xz(const void *src, uint64_t src_size,
void **buffer, size_t *buffer_size,
const void *prefix, size_t prefix_len,
uint8_t extra);
int decompress_startswith_lz4(const void *src, uint64_t src_size,
void **buffer, size_t *buffer_size,
const void *prefix, size_t prefix_len,
uint8_t extra);
int decompress_startswith(int compression,
const void *src, uint64_t src_size,
void **buffer, size_t *buffer_size,
const void *prefix, size_t prefix_len,
uint8_t extra);
int compress_stream_xz(int fdf, int fdt, uint64_t max_bytes);
int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes);
int decompress_stream_xz(int fdf, int fdt, uint64_t max_size);
int decompress_stream_lz4(int fdf, int fdt, uint64_t max_size);
#ifdef HAVE_LZ4
# define compress_stream compress_stream_lz4
# define COMPRESSED_EXT ".lz4"
#else
# define compress_stream compress_stream_xz
# define COMPRESSED_EXT ".xz"
#endif
int decompress_stream(const char *filename, int fdf, int fdt, uint64_t max_bytes);