1 /* 2 * Wrappers for zlib 3 * Copyright (C) 2022 Andreas Rheinhardt 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22 #ifndef AVCODEC_ZLIB_WRAPPER_H 23 #define AVCODEC_ZLIB_WRAPPER_H 24 25 #include <zlib.h> 26 27 typedef struct FFZStream { 28 z_stream zstream; 29 int inited; 30 } FFZStream; 31 32 /** 33 * Wrapper around inflateInit(). It initializes the fields that zlib 34 * requires to be initialized before inflateInit(). 35 * In case of error it also returns an error message to the provided logctx; 36 * in any case, it sets zstream->inited to indicate whether inflateInit() 37 * succeeded. 38 * @return Returns 0 on success or a negative error code on failure 39 */ 40 int ff_inflate_init(FFZStream *zstream, void *logctx); 41 42 /** 43 * Wrapper around inflateEnd(). It calls inflateEnd() iff 44 * zstream->inited is set and resets zstream->inited. 45 * It is therefore safe to be called even if 46 * ff_inflate_init() has never been called on it (or errored out) 47 * provided that the FFZStream (or just FFZStream.inited) has been zeroed. 48 */ 49 void ff_inflate_end(FFZStream *zstream); 50 51 /** 52 * Wrapper around deflateInit(). It works analogously to ff_inflate_init(). 53 */ 54 int ff_deflate_init(FFZStream *zstream, int level, void *logctx); 55 56 /** 57 * Wrapper around deflateEnd(). It works analogously to ff_inflate_end(). 58 */ 59 void ff_deflate_end(FFZStream *zstream); 60 61 #endif /* AVCODEC_ZLIB_WRAPPER_H */ 62