diff options
Diffstat (limited to 'plugins/gme/game-music-emu-0.6.0/gme/Nsfe_Emu.cpp')
-rw-r--r-- | plugins/gme/game-music-emu-0.6.0/gme/Nsfe_Emu.cpp | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Nsfe_Emu.cpp b/plugins/gme/game-music-emu-0.6.0/gme/Nsfe_Emu.cpp new file mode 100644 index 00000000..eb8cdadf --- /dev/null +++ b/plugins/gme/game-music-emu-0.6.0/gme/Nsfe_Emu.cpp @@ -0,0 +1,332 @@ +// Game_Music_Emu 0.5.5. http://www.slack.net/~ant/ + +#include "Nsfe_Emu.h" + +#include "blargg_endian.h" +#include <string.h> +#include <ctype.h> + +/* Copyright (C) 2005-2006 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" + +Nsfe_Info::Nsfe_Info() { playlist_disabled = false; } + +Nsfe_Info::~Nsfe_Info() { } + +inline void Nsfe_Info::unload() +{ + track_name_data.clear(); + track_names.clear(); + playlist.clear(); + track_times.clear(); +} + +// TODO: if no playlist, treat as if there is a playlist that is just 1,2,3,4,5... ? +void Nsfe_Info::disable_playlist( bool b ) +{ + playlist_disabled = b; + info.track_count = playlist.size(); + if ( !info.track_count || playlist_disabled ) + info.track_count = actual_track_count_; +} + +int Nsfe_Info::remap_track( int track ) const +{ + if ( !playlist_disabled && (unsigned) track < playlist.size() ) + track = playlist [track]; + return track; +} + +// Read multiple strings and separate into individual strings +static blargg_err_t read_strs( Data_Reader& in, long size, blargg_vector<char>& chars, + blargg_vector<const char*>& strs ) +{ + RETURN_ERR( chars.resize( size + 1 ) ); + chars [size] = 0; // in case last string doesn't have terminator + RETURN_ERR( in.read( &chars [0], size ) ); + + RETURN_ERR( strs.resize( 128 ) ); + int count = 0; + for ( int i = 0; i < size; i++ ) + { + if ( (int) strs.size() <= count ) + RETURN_ERR( strs.resize( count * 2 ) ); + strs [count++] = &chars [i]; + while ( i < size && chars [i] ) + i++; + } + + return strs.resize( count ); +} + +// Copy in to out, where out has out_max characters allocated. Truncate to +// out_max - 1 characters. +static void copy_str( const char* in, char* out, int out_max ) +{ + out [out_max - 1] = 0; + strncpy( out, in, out_max - 1 ); +} + +struct nsfe_info_t +{ + byte load_addr [2]; + byte init_addr [2]; + byte play_addr [2]; + byte speed_flags; + byte chip_flags; + byte track_count; + byte first_track; + byte unused [6]; +}; + +blargg_err_t Nsfe_Info::load( Data_Reader& in, Nsf_Emu* nsf_emu ) +{ + int const nsfe_info_size = 16; + assert( offsetof (nsfe_info_t,unused [6]) == nsfe_info_size ); + + // check header + byte signature [4]; + blargg_err_t err = in.read( signature, sizeof signature ); + if ( err ) + return (err == in.eof_error ? gme_wrong_file_type : err); + if ( memcmp( signature, "NSFE", 4 ) ) + return gme_wrong_file_type; + + // free previous info + track_name_data.clear(); + track_names.clear(); + playlist.clear(); + track_times.clear(); + + // default nsf header + static const Nsf_Emu::header_t base_header = + { + {'N','E','S','M','\x1A'},// tag + 1, // version + 1, 1, // track count, first track + {0,0},{0,0},{0,0}, // addresses + "","","", // strings + {0x1A, 0x41}, // NTSC rate + {0,0,0,0,0,0,0,0}, // banks + {0x20, 0x4E}, // PAL rate + 0, 0, // flags + {0,0,0,0} // unused + }; + Nsf_Emu::header_t& header = info; + header = base_header; + + // parse tags + int phase = 0; + while ( phase != 3 ) + { + // read size and tag + byte block_header [2] [4]; + RETURN_ERR( in.read( block_header, sizeof block_header ) ); + blargg_long size = get_le32( block_header [0] ); + blargg_long tag = get_le32( block_header [1] ); + + //debug_printf( "tag: %c%c%c%c\n", char(tag), char(tag>>8), char(tag>>16), char(tag>>24) ); + + switch ( tag ) + { + case BLARGG_4CHAR('O','F','N','I'): { + check( phase == 0 ); + if ( size < 8 ) + return "Corrupt file"; + + nsfe_info_t finfo; + finfo.track_count = 1; + finfo.first_track = 0; + + RETURN_ERR( in.read( &finfo, min( size, (blargg_long) nsfe_info_size ) ) ); + if ( size > nsfe_info_size ) + RETURN_ERR( in.skip( size - nsfe_info_size ) ); + phase = 1; + info.speed_flags = finfo.speed_flags; + info.chip_flags = finfo.chip_flags; + info.track_count = finfo.track_count; + this->actual_track_count_ = finfo.track_count; + info.first_track = finfo.first_track; + memcpy( info.load_addr, finfo.load_addr, 2 * 3 ); + break; + } + + case BLARGG_4CHAR('K','N','A','B'): + if ( size > (int) sizeof info.banks ) + return "Corrupt file"; + RETURN_ERR( in.read( info.banks, size ) ); + break; + + case BLARGG_4CHAR('h','t','u','a'): { + blargg_vector<char> chars; + blargg_vector<const char*> strs; + RETURN_ERR( read_strs( in, size, chars, strs ) ); + int n = strs.size(); + + if ( n > 3 ) + copy_str( strs [3], info.dumper, sizeof info.dumper ); + + if ( n > 2 ) + copy_str( strs [2], info.copyright, sizeof info.copyright ); + + if ( n > 1 ) + copy_str( strs [1], info.author, sizeof info.author ); + + if ( n > 0 ) + copy_str( strs [0], info.game, sizeof info.game ); + + break; + } + + case BLARGG_4CHAR('e','m','i','t'): + RETURN_ERR( track_times.resize( size / 4 ) ); + RETURN_ERR( in.read( track_times.begin(), track_times.size() * 4 ) ); + break; + + case BLARGG_4CHAR('l','b','l','t'): + RETURN_ERR( read_strs( in, size, track_name_data, track_names ) ); + break; + + case BLARGG_4CHAR('t','s','l','p'): + RETURN_ERR( playlist.resize( size ) ); + RETURN_ERR( in.read( &playlist [0], size ) ); + break; + + case BLARGG_4CHAR('A','T','A','D'): { + check( phase == 1 ); + phase = 2; + if ( !nsf_emu ) + { + RETURN_ERR( in.skip( size ) ); + } + else + { + Subset_Reader sub( &in, size ); // limit emu to nsf data + Remaining_Reader rem( &header, Nsf_Emu::header_size, &sub ); + RETURN_ERR( nsf_emu->load( rem ) ); + check( rem.remain() == 0 ); + } + break; + } + + case BLARGG_4CHAR('D','N','E','N'): + check( phase == 2 ); + phase = 3; + break; + + default: + // tags that can be skipped start with a lowercase character + check( islower( (tag >> 24) & 0xFF ) ); + RETURN_ERR( in.skip( size ) ); + break; + } + } + + return 0; +} + +blargg_err_t Nsfe_Info::track_info_( track_info_t* out, int track ) const +{ + int remapped = remap_track( track ); + if ( (unsigned) remapped < track_times.size() ) + { + long length = (BOOST::int32_t) get_le32( track_times [remapped] ); + if ( length > 0 ) + out->length = length; + } + if ( (unsigned) remapped < track_names.size() ) + Gme_File::copy_field_( out->song, track_names [remapped] ); + + GME_COPY_FIELD( info, out, game ); + GME_COPY_FIELD( info, out, author ); + GME_COPY_FIELD( info, out, copyright ); + GME_COPY_FIELD( info, out, dumper ); + return 0; +} + +Nsfe_Emu::Nsfe_Emu() +{ + loading = false; + set_type( gme_nsfe_type ); +} + +Nsfe_Emu::~Nsfe_Emu() { } + +void Nsfe_Emu::unload() +{ + if ( !loading ) + info.unload(); // TODO: extremely hacky! + Nsf_Emu::unload(); +} + +blargg_err_t Nsfe_Emu::track_info_( track_info_t* out, int track ) const +{ + return info.track_info_( out, track ); +} + +struct Nsfe_File : Gme_Info_ +{ + Nsfe_Info info; + + Nsfe_File() { set_type( gme_nsfe_type ); } + + blargg_err_t load_( Data_Reader& in ) + { + RETURN_ERR( info.load( in, 0 ) ); + info.disable_playlist( false ); + set_track_count( info.info.track_count ); + return 0; + } + + blargg_err_t track_info_( track_info_t* out, int track ) const + { + return info.track_info_( out, track ); + } +}; + +static Music_Emu* new_nsfe_emu () { return BLARGG_NEW Nsfe_Emu ; } +static Music_Emu* new_nsfe_file() { return BLARGG_NEW Nsfe_File; } + +static gme_type_t_ const gme_nsfe_type_ = { "Nintendo NES", 0, &new_nsfe_emu, &new_nsfe_file, "NSFE", 1 }; +gme_type_t const gme_nsfe_type = &gme_nsfe_type_; + + +blargg_err_t Nsfe_Emu::load_( Data_Reader& in ) +{ + if ( loading ) + return Nsf_Emu::load_( in ); + + // TODO: this hacky recursion-avoidance could have subtle problems + loading = true; + blargg_err_t err = info.load( in, this ); + loading = false; + disable_playlist( false ); + return err; +} + +void Nsfe_Emu::disable_playlist( bool b ) +{ + info.disable_playlist( b ); + set_track_count( info.info.track_count ); +} + +void Nsfe_Emu::clear_playlist_() +{ + disable_playlist(); + Nsf_Emu::clear_playlist_(); +} + +blargg_err_t Nsfe_Emu::start_track_( int track ) +{ + return Nsf_Emu::start_track_( info.remap_track( track ) ); +} |