src/import/import-compress.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2015 Lennart Poettering
   8
   9   systemd is free software; you can redistribute it and/or modify it
  10   under the terms of the GNU Lesser General Public License as published by
  11   the Free Software Foundation; either version 2.1 of the License, or
  12   (at your option) any later version.
  13
  14   systemd is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   Lesser General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  21 ***/
  22
  23 #include <bzlib.h>
  24 #include <lzma.h>
  25 #include <sys/types.h>
  26 #include <zlib.h>
  27
  28 #include "macro.h"
  29
  30 typedef enum ImportCompressType {
  31         IMPORT_COMPRESS_UNKNOWN,
  32         IMPORT_COMPRESS_UNCOMPRESSED,
  33         IMPORT_COMPRESS_XZ,
  34         IMPORT_COMPRESS_GZIP,
  35         IMPORT_COMPRESS_BZIP2,
  36         _IMPORT_COMPRESS_TYPE_MAX,
  37         _IMPORT_COMPRESS_TYPE_INVALID = -1,
  38 } ImportCompressType;
  39
  40 typedef struct ImportCompress {
  41         ImportCompressType type;
  42         bool encoding;
  43         union {
  44                 lzma_stream xz;
  45                 z_stream gzip;
  46                 bz_stream bzip2;
  47         };
  48 } ImportCompress;
  49
  50 typedef int (*ImportCompressCallback)(const void *data, size_t size, void *userdata);
  51
  52 void import_compress_free(ImportCompress *c);
  53
  54 int import_uncompress_detect(ImportCompress *c, const void *data, size_t size);
  55 int import_uncompress(ImportCompress *c, const void *data, size_t size, ImportCompressCallback callback, void *userdata);
  56
  57 int import_compress_init(ImportCompress *c, ImportCompressType t);
  58 int import_compress(ImportCompress *c, const void *data, size_t size, void **buffer, size_t *buffer_size, size_t *buffer_allocated);
  59 int import_compress_finish(ImportCompress *c, void **buffer, size_t *buffer_size, size_t *buffer_allocated);
  60
  61 const char* import_compress_type_to_string(ImportCompressType t) _const_;
  62 ImportCompressType import_compress_type_from_string(const char *s) _pure_;