libavcodec/zlib_wrapper.c

   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 #include <zlib.h>
  23
  24 #include "config.h"
  25 #include "libavutil/error.h"
  26 #include "libavutil/log.h"
  27 #include "libavutil/mem.h"
  28 #include "zlib_wrapper.h"
  29
  30 static void *alloc_wrapper(void *opaque, uInt items, uInt size)
  31 {
  32     return av_malloc_array(items, size);
  33 }
  34
  35 static void free_wrapper(void *opaque, void *ptr)
  36 {
  37     av_free(ptr);
  38 }
  39
  40 #if CONFIG_INFLATE_WRAPPER
  41 int ff_inflate_init(FFZStream *z, void *logctx)
  42 {
  43     z_stream *const zstream = &z->zstream;
  44     int zret;
  45
  46     z->inited = 0;
  47     zstream->next_in  = Z_NULL;
  48     zstream->avail_in = 0;
  49     zstream->zalloc   = alloc_wrapper;
  50     zstream->zfree    = free_wrapper;
  51     zstream->opaque   = Z_NULL;
  52
  53     zret = inflateInit(zstream);
  54     if (zret == Z_OK) {
  55         z->inited = 1;
  56     } else {
  57         av_log(logctx, AV_LOG_ERROR, "inflateInit error %d, message: %s\n",
  58                zret, zstream->msg ? zstream->msg : "");
  59         return AVERROR_EXTERNAL;
  60     }
  61     return 0;
  62 }
  63
  64 void ff_inflate_end(FFZStream *z)
  65 {
  66     if (z->inited) {
  67         z->inited = 0;
  68         inflateEnd(&z->zstream);
  69     }
  70 }
  71 #endif
  72
  73 #if CONFIG_DEFLATE_WRAPPER
  74 int ff_deflate_init(FFZStream *z, int level, void *logctx)
  75 {
  76     z_stream *const zstream = &z->zstream;
  77     int zret;
  78
  79     z->inited = 0;
  80     zstream->zalloc = alloc_wrapper;
  81     zstream->zfree  = free_wrapper;
  82     zstream->opaque = Z_NULL;
  83
  84     zret = deflateInit(zstream, level);
  85     if (zret == Z_OK) {
  86         z->inited = 1;
  87     } else {
  88         av_log(logctx, AV_LOG_ERROR, "deflateInit error %d, message: %s\n",
  89                zret, zstream->msg ? zstream->msg : "");
  90         return AVERROR_EXTERNAL;
  91     }
  92     return 0;
  93 }
  94
  95 void ff_deflate_end(FFZStream *z)
  96 {
  97     if (z->inited) {
  98         z->inited = 0;
  99         deflateEnd(&z->zstream);
 100     }
 101 }
 102 #endif