99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
// File_Extractor 1.0.0. http://www.slack.net/~ant/
|
|
|
|
#include "Gzip_Extractor.h"
|
|
|
|
/* Copyright (C) 2005-2009 Shay Green. This module is free software; you
|
|
can redistribute it and/or modify it under the terms of the GNU Lesser
|
|
General Public License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version. This
|
|
module is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
|
|
details. You should have received a copy of the GNU Lesser General Public
|
|
License along with this module; if not, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
|
|
|
|
#include "blargg_source.h"
|
|
|
|
// TODO: could close file once data has been read into memory
|
|
|
|
static blargg_err_t init_gzip_file()
|
|
{
|
|
get_crc_table(); // initialize zlib's CRC-32 tables
|
|
return blargg_ok;
|
|
}
|
|
|
|
static File_Extractor* new_gzip()
|
|
{
|
|
return BLARGG_NEW Gzip_Extractor;
|
|
}
|
|
|
|
fex_type_t_ const fex_gz_type [1] = {{
|
|
".gz",
|
|
&new_gzip,
|
|
"gzipped file",
|
|
&init_gzip_file
|
|
}};
|
|
|
|
Gzip_Extractor::Gzip_Extractor() :
|
|
File_Extractor( fex_gz_type )
|
|
{ }
|
|
|
|
Gzip_Extractor::~Gzip_Extractor()
|
|
{
|
|
close();
|
|
}
|
|
|
|
blargg_err_t Gzip_Extractor::open_path_v()
|
|
{
|
|
// skip opening file
|
|
return open_v();
|
|
}
|
|
|
|
blargg_err_t Gzip_Extractor::stat_v()
|
|
{
|
|
RETURN_ERR( open_arc_file( true ) );
|
|
if ( !gr.opened() || gr.tell() != 0 )
|
|
RETURN_ERR( gr.open( &arc() ) );
|
|
|
|
set_info( gr.remain(), 0, gr.crc32() );
|
|
return blargg_ok;
|
|
}
|
|
|
|
blargg_err_t Gzip_Extractor::open_v()
|
|
{
|
|
// Remove .gz suffix
|
|
size_t len = strlen( arc_path() );
|
|
if ( fex_has_extension( arc_path(), ".gz" ) )
|
|
len -= 3;
|
|
|
|
RETURN_ERR( name.resize( len + 1 ) );
|
|
memcpy( name.begin(), arc_path(), name.size() );
|
|
name [name.size() - 1] = '\0';
|
|
|
|
set_name( name.begin() );
|
|
return blargg_ok;
|
|
}
|
|
|
|
void Gzip_Extractor::close_v()
|
|
{
|
|
name.clear();
|
|
gr.close();
|
|
}
|
|
|
|
blargg_err_t Gzip_Extractor::next_v()
|
|
{
|
|
return blargg_ok;
|
|
}
|
|
|
|
blargg_err_t Gzip_Extractor::rewind_v()
|
|
{
|
|
set_name( name.begin() );
|
|
return blargg_ok;
|
|
}
|
|
|
|
blargg_err_t Gzip_Extractor::extract_v( void* p, long n )
|
|
{
|
|
return gr.read( p, n );
|
|
}
|