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426 lines
8.2 KiB
C++
426 lines
8.2 KiB
C++
// Game_Music_Emu 0.6.0. http://www.slack.net/~ant/
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#include "M3u_Playlist.h"
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#include "Music_Emu.h"
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#include <string.h>
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/* Copyright (C) 2006 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "blargg_source.h"
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// gme functions defined here to avoid linking in m3u code unless it's used
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blargg_err_t Gme_File::load_m3u_( blargg_err_t err )
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{
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require( raw_track_count_ ); // file must be loaded first
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if ( !err )
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{
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if ( playlist.size() )
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track_count_ = playlist.size();
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int line = playlist.first_error();
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if ( line )
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{
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// avoid using bloated printf()
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char* out = &playlist_warning [sizeof playlist_warning];
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*--out = 0;
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do {
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*--out = line % 10 + '0';
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} while ( (line /= 10) > 0 );
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static const char str [] = "Problem in m3u at line ";
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out -= sizeof str - 1;
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memcpy( out, str, sizeof str - 1 );
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set_warning( out );
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}
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}
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return err;
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}
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blargg_err_t Gme_File::load_m3u( const char* path ) { return load_m3u_( playlist.load( path ) ); }
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blargg_err_t Gme_File::load_m3u( Data_Reader& in ) { return load_m3u_( playlist.load( in ) ); }
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BLARGG_EXPORT gme_err_t gme_load_m3u( Music_Emu* me, const char* path ) { return me->load_m3u( path ); }
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BLARGG_EXPORT gme_err_t gme_load_m3u_data( Music_Emu* me, const void* data, long size )
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{
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Mem_File_Reader in( data, size );
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return me->load_m3u( in );
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}
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static char* skip_white( char* in )
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{
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while ( *in == ' ' )
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in++;
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return in;
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}
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inline unsigned from_dec( unsigned n ) { return n - '0'; }
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static char* parse_filename( char* in, M3u_Playlist::entry_t& entry )
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{
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entry.file = in;
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entry.type = "";
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char* out = in;
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while ( 1 )
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{
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int c = *in;
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if ( !c ) break;
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in++;
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if ( c == ',' ) // commas in filename
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{
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char* p = skip_white( in );
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if ( *p == '$' || from_dec( *p ) <= 9 )
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{
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in = p;
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break;
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}
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}
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if ( c == ':' && in [0] == ':' && in [1] && in [2] != ',' ) // ::type suffix
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{
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entry.type = ++in;
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while ( (c = *in) != 0 && c != ',' )
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in++;
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if ( c == ',' )
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{
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*in++ = 0; // terminate type
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in = skip_white( in );
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}
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break;
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}
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if ( c == '\\' ) // \ prefix for special characters
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{
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c = *in;
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if ( !c ) break;
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in++;
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}
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*out++ = (char) c;
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}
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*out = 0; // terminate string
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return in;
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}
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static char* next_field( char* in, int* result )
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{
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while ( 1 )
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{
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in = skip_white( in );
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if ( !*in )
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break;
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if ( *in == ',' )
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{
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in++;
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break;
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}
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*result = 1;
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in++;
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}
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return skip_white( in );
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}
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static char* parse_int_( char* in, int* out )
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{
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int n = 0;
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while ( 1 )
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{
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unsigned d = from_dec( *in );
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if ( d > 9 )
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break;
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in++;
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n = n * 10 + d;
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*out = n;
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}
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return in;
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}
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static char* parse_int( char* in, int* out, int* result )
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{
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return next_field( parse_int_( in, out ), result );
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}
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// Returns 16 or greater if not hex
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inline int from_hex_char( int h )
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{
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h -= 0x30;
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if ( (unsigned) h > 9 )
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h = ((h - 0x11) & 0xDF) + 10;
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return h;
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}
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static char* parse_track( char* in, M3u_Playlist::entry_t& entry, int* result )
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{
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if ( *in == '$' )
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{
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in++;
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int n = 0;
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while ( 1 )
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{
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int h = from_hex_char( *in );
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if ( h > 15 )
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break;
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in++;
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n = n * 16 + h;
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entry.track = n;
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}
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}
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else
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{
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in = parse_int_( in, &entry.track );
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if ( entry.track >= 0 )
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entry.decimal_track = 1;
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}
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return next_field( in, result );
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}
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static char* parse_time_( char* in, int* out )
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{
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*out = -1;
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int n = -1;
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in = parse_int_( in, &n );
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if ( n >= 0 )
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{
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*out = n;
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if ( *in == ':' )
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{
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n = -1;
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in = parse_int_( in + 1, &n );
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if ( n >= 0 )
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*out = *out * 60 + n;
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}
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}
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return in;
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}
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static char* parse_time( char* in, int* out, int* result )
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{
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return next_field( parse_time_( in, out ), result );
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}
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static char* parse_name( char* in )
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{
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char* out = in;
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while ( 1 )
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{
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int c = *in;
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if ( !c ) break;
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in++;
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if ( c == ',' ) // commas in string
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{
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char* p = skip_white( in );
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if ( *p == ',' || *p == '-' || from_dec( *p ) <= 9 )
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{
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in = p;
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break;
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}
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}
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if ( c == '\\' ) // \ prefix for special characters
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{
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c = *in;
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if ( !c ) break;
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in++;
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}
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*out++ = (char) c;
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}
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*out = 0; // terminate string
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return in;
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}
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static int parse_line( char* in, M3u_Playlist::entry_t& entry )
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{
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int result = 0;
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// file
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entry.file = in;
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entry.type = "";
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in = parse_filename( in, entry );
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// track
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entry.track = -1;
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entry.decimal_track = 0;
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in = parse_track( in, entry, &result );
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// name
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entry.name = in;
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in = parse_name( in );
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// time
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entry.length = -1;
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in = parse_time( in, &entry.length, &result );
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// loop
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entry.intro = -1;
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entry.loop = -1;
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if ( *in == '-' )
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{
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entry.loop = entry.length;
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in++;
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}
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else
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{
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in = parse_time_( in, &entry.loop );
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if ( entry.loop >= 0 )
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{
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entry.intro = 0;
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if ( *in == '-' ) // trailing '-' means that intro length was specified
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{
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in++;
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entry.intro = entry.loop;
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entry.loop = entry.length - entry.intro;
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}
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}
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}
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in = next_field( in, &result );
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// fade
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entry.fade = -1;
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in = parse_time( in, &entry.fade, &result );
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// repeat
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entry.repeat = -1;
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in = parse_int( in, &entry.repeat, &result );
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return result;
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}
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static void parse_comment( char* in, M3u_Playlist::info_t& info, bool first )
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{
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in = skip_white( in + 1 );
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const char* field = in;
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while ( *in && *in != ':' )
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in++;
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if ( *in == ':' )
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{
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const char* text = skip_white( in + 1 );
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if ( *text )
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{
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*in = 0;
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if ( !strcmp( "Composer", field ) ) info.composer = text;
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else if ( !strcmp( "Engineer", field ) ) info.engineer = text;
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else if ( !strcmp( "Ripping" , field ) ) info.ripping = text;
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else if ( !strcmp( "Tagging" , field ) ) info.tagging = text;
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else
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text = 0;
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if ( text )
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return;
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*in = ':';
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}
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}
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if ( first )
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info.title = field;
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}
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blargg_err_t M3u_Playlist::parse_()
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{
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info_.title = "";
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info_.composer = "";
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info_.engineer = "";
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info_.ripping = "";
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info_.tagging = "";
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int const CR = 13;
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int const LF = 10;
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data.end() [-1] = LF; // terminate input
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first_error_ = 0;
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bool first_comment = true;
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int line = 0;
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int count = 0;
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char* in = data.begin();
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while ( in < data.end() )
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{
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// find end of line and terminate it
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line++;
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char* begin = in;
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while ( *in != CR && *in != LF )
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{
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if ( !*in )
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return "Not an m3u playlist";
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in++;
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}
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if ( in [0] == CR && in [1] == LF ) // treat CR,LF as a single line
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*in++ = 0;
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*in++ = 0;
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// parse line
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if ( *begin == '#' )
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{
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parse_comment( begin, info_, first_comment );
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first_comment = false;
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}
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else if ( *begin )
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{
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if ( (int) entries.size() <= count )
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RETURN_ERR( entries.resize( count * 2 + 64 ) );
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if ( !parse_line( begin, entries [count] ) )
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count++;
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else if ( !first_error_ )
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first_error_ = line;
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first_comment = false;
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}
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}
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if ( count <= 0 )
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return "Not an m3u playlist";
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if ( !(info_.composer [0] | info_.engineer [0] | info_.ripping [0] | info_.tagging [0]) )
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info_.title = "";
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return entries.resize( count );
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}
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blargg_err_t M3u_Playlist::parse()
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{
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blargg_err_t err = parse_();
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if ( err )
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{
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entries.clear();
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data.clear();
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}
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return err;
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}
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blargg_err_t M3u_Playlist::load( Data_Reader& in )
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{
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RETURN_ERR( data.resize( in.remain() + 1 ) );
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RETURN_ERR( in.read( data.begin(), data.size() - 1 ) );
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return parse();
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}
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blargg_err_t M3u_Playlist::load( const char* path )
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{
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GME_FILE_READER in;
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RETURN_ERR( in.open( path ) );
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return load( in );
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}
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blargg_err_t M3u_Playlist::load( void const* in, long size )
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{
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RETURN_ERR( data.resize( size + 1 ) );
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memcpy( data.begin(), in, size );
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return parse();
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}
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