mirror of
https://github.com/DaedalusX64/daedalus.git
synced 2025-04-02 10:21:48 -04:00
158 lines
3.7 KiB
C++
158 lines
3.7 KiB
C++
/*
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Copyright (C) 2006 StrmnNrmn
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "BuildOptions.h"
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#include "Base/Types.h"
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#include "Debug/DBGConsole.h"
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#include "RomFile/RomFile.h"
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#include "RomFile/RomFileCompressed.h"
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#include "RomFile/RomFileUncompressed.h"
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#include "Utility/Stream.h"
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#include "System/IO.h"
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#include <algorithm>
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#include <string.h>
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#include <filesystem>
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bool IsRomfilename( const char * rom_filename )
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{
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const char * last_period( strrchr( rom_filename, '.' ) );
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if(last_period == NULL)
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return false;
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return (strcasecmp(last_period, ".v64") == 0 ||
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strcasecmp(last_period, ".z64") == 0 ||
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strcasecmp(last_period, ".n64") == 0 ||
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strcasecmp(last_period, ".rom") == 0 ||
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strcasecmp(last_period, ".bin") == 0 ||
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strcasecmp(last_period, ".jap") == 0 ||
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strcasecmp(last_period, ".pal") == 0 ||
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strcasecmp(last_period, ".usa") == 0 ||
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strcasecmp(last_period, ".zip") == 0);
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}
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std::shared_ptr<ROMFile> ROMFile::Create( const std::filesystem::path filename )
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{
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const char * ext = IO::Path::FindExtension( filename.c_str() );
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if (ext && strcasecmp(ext, ".zip") == 0)
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{
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#ifdef DAEDALUS_COMPRESSED_ROM_SUPPORT
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return new ROMFileCompressed( filename.c_str() );
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#else
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return NULL;
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#endif
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}
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else
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{
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return std::make_shared<ROMFileUncompressed>( filename.c_str() );
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}
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}
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ROMFile::ROMFile( const std::filesystem::path filename )
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: mHeaderMagic( 0 )
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, mFilename ( filename )
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{
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}
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ROMFile::~ROMFile()
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{
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}
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bool ROMFile::LoadData( u32 bytes_to_read, u8 *p_bytes, COutputStream & messages )
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{
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if( !LoadRawData( bytes_to_read, p_bytes, messages ) )
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{
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messages << "Unable to get rom info from '" << mFilename.c_str() << "'";
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return false;
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}
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return true;
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}
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bool ROMFile::RequiresSwapping() const
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{
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DAEDALUS_ASSERT( mHeaderMagic != 0, "The header magic hasn't been set" );
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return mHeaderMagic != 0x80371240;
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}
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bool ROMFile::SetHeaderMagic( u32 magic )
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{
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mHeaderMagic = magic;
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switch (mHeaderMagic)
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{
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case 0x80371240:
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case 0x40123780:
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case 0x12408037:
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break;
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default:
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DAEDALUS_ERROR( "Unhandled swapping mode: %08x - ROM format is not supported for %s", mHeaderMagic, mFilename.c_str() );
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return false;
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}
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return true;
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}
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void ROMFile::CorrectSwap( u8 * p_bytes, u32 length )
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{
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switch (mHeaderMagic)
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{
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case 0x80371240:
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// Pre byteswapped - no need to do anything
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break;
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case 0x40123780:
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ByteSwap_3210( p_bytes, length );
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break;
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case 0x12408037:
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ByteSwap_2301( p_bytes, length );
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break;
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default:
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DAEDALUS_ERROR( "Unhandled swapping mode: %08x", mHeaderMagic );
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break;
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}
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}
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// Swap bytes from 37 80 40 12
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// to 40 12 37 80
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void ROMFile::ByteSwap_2301( void * p_bytes, u32 length )
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{
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u32* p = (u32*)p_bytes;
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u32* maxp = (u32*)((u8*)p_bytes + length);
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for(; p < maxp; p++)
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{
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std::swap(((u16*)p)[0], ((u16*)p)[1]);
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}
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}
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// Swap bytes from 80 37 12 40
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// to 40 12 37 80
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void ROMFile::ByteSwap_3210( void * p_bytes, u32 length )
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{
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u8* p = (u8*)p_bytes;
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u8* maxp = (u8*)(p + length);
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for(; p < maxp; p+=4)
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{
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std::swap(p[0], p[3]);
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std::swap(p[1], p[2]);
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}
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}
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