1 files changed, 99 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Rom_Data.cpp b/plugins/gme/game-music-emu-0.6pre/gme/Rom_Data.cpp
new file mode 100644
index 00000000..55d53d33
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6pre/gme/Rom_Data.cpp
@@ -0,0 +1,99 @@
+// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
+
+#include "Rom_Data.h"
+
+/* Copyright (C) 2003-2009 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"
+
+void Rom_Data::clear()
+{
+	file_size_ = 0;
+	rom_addr   = 0;
+	mask       = 0;
+	rom.clear();
+}
+
+Rom_Data::Rom_Data( int page_size ) :
+	pad_size( page_size + pad_extra )
+{
+	// page_size should be power of 2
+	check( (page_size & (page_size - 1)) == 0 );
+	
+	clear();
+}
+
+Rom_Data::~Rom_Data()
+{ }
+
+// Reads file into array, placing file_offset bytes of padding before the beginning, and pad_size after the end
+blargg_err_t Rom_Data::load_( Data_Reader& in, int header_size, int file_offset )
+{
+	clear();
+	file_size_ = in.remain();
+	if ( file_size_ <= header_size ) // <= because there must be data after header
+		return blargg_err_file_type;
+	
+	RETURN_ERR( rom.resize( file_offset + file_size_ + pad_size ) );
+	
+	return in.read( rom.begin() + file_offset, file_size_ );
+}
+
+blargg_err_t Rom_Data::load( Data_Reader& in, int header_size,
+		void* header_out, int fill )
+{
+	int file_offset = pad_size - header_size;
+	blargg_err_t err = load_( in, header_size, file_offset );
+	if ( err )
+	{
+		clear();
+		return err;
+	}
+	
+	file_size_ -= header_size;
+	memcpy( header_out, &rom [file_offset], header_size );
+	
+	memset( rom.begin()         , fill, pad_size );
+	memset( rom.end() - pad_size, fill, pad_size );
+	
+	return blargg_ok;
+}
+
+void Rom_Data::set_addr( int addr )
+{
+	int const page_size = pad_size - pad_extra;
+	
+	// Minimum size that contains all bytes and is a multiple of page_size
+	int const size = (addr + file_size_ + page_size - 1) / page_size * page_size;
+	
+	// Find lowest power of 2 that is >= size
+	int power2 = 1;
+	while ( power2 < size )
+		power2 *= 2;
+	
+	mask = power2 - 1;
+	
+	// Address of first byte of ROM (possibly negative)
+	rom_addr = addr - page_size - pad_extra;
+
+	if ( rom.resize( size - rom_addr + pad_extra ) ) { } // OK if shrink fails
+}
+
+byte* Rom_Data::at_addr( int addr )
+{
+	int offset = mask_addr( addr ) - rom_addr;
+	
+	if ( (unsigned) offset > (unsigned) (rom.size() - pad_size) )
+		offset = 0; // unmapped
+	
+	return &rom [offset];
+}