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Member "xorriso-1.5.4/libisofs/filter.c" (30 Jan 2021, 1624 Bytes) of package /linux/misc/xorriso-1.5.4.pl02.tar.gz:

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    1 /*
    2  * Copyright (c) 2008 Vreixo Formoso
    3  * Copyright (c) 2009 Thomas Schmitt
    4  * 
    5  * This file is part of the libisofs project; you can redistribute it and/or 
    6  * modify it under the terms of the GNU General Public License version 2 
    7  * or later as published by the Free Software Foundation. 
    8  * See COPYING file for details.
    9  */
   10 
   11 #ifdef HAVE_CONFIG_H
   12 #include "../config.h"
   13 #endif
   14 
   15 #include "libisofs.h"
   16 #include "filter.h"
   17 #include "node.h"
   18 
   19 
   20 void iso_filter_ref(FilterContext *filter)
   21 {
   22     ++filter->refcount;
   23 }
   24 
   25 void iso_filter_unref(FilterContext *filter)
   26 {
   27     if (--filter->refcount == 0) {
   28         filter->free(filter);
   29         free(filter);
   30     }
   31 }
   32 
   33 int iso_file_add_filter(IsoFile *file, FilterContext *filter, int flag)
   34 {
   35     int ret;
   36     IsoStream *original, *filtered;
   37     if (file == NULL || filter == NULL) {
   38         return ISO_NULL_POINTER;
   39     }
   40     
   41     original = file->stream;
   42 
   43     if (!iso_stream_is_repeatable(original)) {
   44         /* TODO use custom error */
   45         return ISO_WRONG_ARG_VALUE;
   46     }
   47     
   48     ret = filter->get_filter(filter, original, &filtered);
   49     if (ret < 0) {
   50         return ret;
   51     }
   52     iso_stream_unref(original);
   53     file->stream = filtered;
   54     return ISO_SUCCESS;
   55 }
   56 
   57 
   58 int iso_file_remove_filter(IsoFile *file, int flag)
   59 {
   60     IsoStream *file_stream, *input_stream;
   61 
   62     file_stream = file->stream;
   63     input_stream = iso_stream_get_input_stream(file_stream, 0);
   64     if (input_stream == NULL)
   65         return 0;
   66     file->stream = input_stream;
   67     iso_stream_ref(input_stream); /* Protect against _unref(file_stream) */
   68     iso_stream_unref(file_stream);
   69     return 1;
   70 }
   71