1 /* ***** BEGIN LICENSE BLOCK *****
5 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
7 * The contents of this file are subject to the Mozilla Public License
8 * Version 1.1 (the "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 * http://www.mozilla.org/MPL/
12 * Software distributed under the License is distributed on an "AS IS" basis,
13 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
14 * the specific language governing rights and limitations under the License.
16 * The Original Code is BBC Research code.
18 * The Initial Developer of the Original Code is the British Broadcasting
20 * Portions created by the Initial Developer are Copyright (C) 2007.
21 * All Rights Reserved.
23 * Contributor(s): Andrea Gabriellini (Original Author)
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26 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
27 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
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36 * ***** END LICENSE BLOCK ***** */
42 #include <decoder/FileReader.hpp>
44 using namespace ::dirac::decoder
;
46 FileReaderException::FileReaderException ( std::string
const& message
)
47 : std::runtime_error ( message
) {}
49 std::string
FileReader::error_message_
= "";
51 FileReader::FileReader ( std::string
const& filename
)
52 : IInput ( true ), str_ ( 0 )
54 if ( !filename
.compare ( "-" ) ) { // pipe, can't rewind
56 str_
= fopen ("/dev/stdin", "rb" );
59 str_
= fopen ( filename
.c_str(), "rb" );
63 error_message_
= "Error while opening " + filename
;
64 throw FileReaderException ( error_message_
);
68 FileReader::~FileReader()
70 if ( str_
) fclose ( str_
);
74 FileReader::available() const
76 return str_
&& !ferror ( str_
) && !feof ( str_
);
80 FileReader::readInput ( pointer begin
, size_type count
)
82 const size_type NO_DATA
= 0;
83 if ( !available() ) return NO_DATA
;
84 size_type bytesread
= NO_DATA
;
85 bytesread
= fread ( static_cast<void*> ( begin
)
86 , sizeof ( value_type
), count
, str_
);
87 if ( ferror ( str_
) ) return NO_DATA
;
93 FileReader::rewindStream ( size_type count
)
95 if ( !str_
|| ferror ( str_
) ) return false;
96 long pos
= ftell ( str_
);
97 if ( count
> static_cast<size_type
> ( pos
) ) return false;
98 if ( fseek ( str_
, -count
, SEEK_CUR
) ) return false;
103 FileReader::fullRewind()
105 if ( !str_
|| ferror ( str_
) ) return false;
106 return ( !fseek ( str_
, 0, SEEK_SET
) );