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/*
* /home/ms/files/source/libsidtune/RCS/PSID.cpp,v
*
* PlaySID one-file format support.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "SidTuneCfg.h"
#include "SidTune.h"
#include "sidendian.h"
#define PSID_ID 0x50534944
#define RSID_ID 0x52534944
// Header has been extended for 'RSID' format
// The following changes are present:
// id = 'RSID'
// version = 2 only
// play, load and speed reserved 0
// psidspecific flag reserved 0
// init cannot be under ROMS/IO
// load cannot be less than 0x0801 (start of basic)
struct psidHeader // all values big-endian
{
char id[4]; // 'PSID' (ASCII)
uint8_t version[2]; // 0x0001 or 0x0002
uint8_t data[2]; // 16-bit offset to binary data in file
uint8_t load[2]; // 16-bit C64 address to load file to
uint8_t init[2]; // 16-bit C64 address of init subroutine
uint8_t play[2]; // 16-bit C64 address of play subroutine
uint8_t songs[2]; // number of songs
uint8_t start[2]; // start song out of [1..256]
uint8_t speed[4]; // 32-bit speed info
// bit: 0=50 Hz, 1=CIA 1 Timer A (default: 60 Hz)
char name[32]; // ASCII strings, 31 characters long and
char author[32]; // terminated by a trailing zero
char released[32]; //
uint8_t flags[2]; // only version 0x0002
uint8_t relocStartPage; // only version 0x0002B
uint8_t relocPages; // only version 0x0002B
uint8_t reserved[2]; // only version 0x0002
};
enum
{
PSID_MUS = 1 << 0,
PSID_SPECIFIC = 1 << 1,
PSID_CLOCK = 3 << 2,
PSID_SIDMODEL = 3 << 4
};
enum
{
PSID_CLOCK_UNKNOWN = 0,
PSID_CLOCK_PAL = 1 << 2,
PSID_CLOCK_NTSC = 1 << 3,
PSID_CLOCK_ANY = PSID_CLOCK_PAL | PSID_CLOCK_NTSC
};
enum
{
PSID_SIDMODEL_UNKNOWN = 0,
PSID_SIDMODEL_6581 = 1 << 4,
PSID_SIDMODEL_8580 = 1 << 5,
PSID_SIDMODEL_ANY = PSID_SIDMODEL_6581 | PSID_SIDMODEL_8580
};
static const char _sidtune_format_psid[] = "PlaySID one-file format (PSID)";
static const char _sidtune_format_rsid[] = "Real C64 one-file format (RSID)";
static const char _sidtune_unknown_psid[] = "Unsupported PSID version";
static const char _sidtune_unknown_rsid[] = "Unsupported RSID version";
static const char _sidtune_truncated[] = "ERROR: File is most likely truncated";
static const char _sidtune_invalid[] = "ERROR: File contains invalid data";
const int _sidtune_psid_maxStrLen = 31;
bool SidTune::PSID_fileSupport(const void* buffer, const uint_least32_t bufLen)
{
int clock, compatibility;
uint_least32_t speed;
#ifdef SIDTUNE_PSID2NG
clock = SIDTUNE_CLOCK_UNKNOWN;
#else
clock = info.clockSpeed;
#endif
compatibility = SIDTUNE_COMPATIBILITY_C64;
// Require minimum size to allow access to the first few bytes.
// Require a valid ID and version number.
const psidHeader* pHeader = (const psidHeader*)buffer;
// File format check
if (bufLen<6)
return false;
if (endian_big32((const uint_least8_t*)pHeader->id)==PSID_ID)
{
if (endian_big16(pHeader->version) >= 3)
{
info.formatString = _sidtune_unknown_psid;
return false;
}
info.formatString = _sidtune_format_psid;
}
else if (endian_big32((const uint_least8_t*)pHeader->id)==RSID_ID)
{
if (endian_big16(pHeader->version) != 2)
{
info.formatString = _sidtune_unknown_rsid;
return false;
}
info.formatString = _sidtune_format_rsid;
compatibility = SIDTUNE_COMPATIBILITY_R64;
}
else
{
return false;
}
// Due to security concerns, input must be at least as long as version 1
// header plus 16-bit C64 load address. That is the area which will be
// accessed.
if ( bufLen < (sizeof(psidHeader)+2) )
{
info.formatString = _sidtune_truncated;
return false;
}
fileOffset = endian_big16(pHeader->data);
info.loadAddr = endian_big16(pHeader->load);
info.initAddr = endian_big16(pHeader->init);
info.playAddr = endian_big16(pHeader->play);
info.songs = endian_big16(pHeader->songs);
info.startSong = endian_big16(pHeader->start);
info.sidChipBase1 = 0xd400;
info.sidChipBase2 = 0;
info.compatibility = compatibility;
speed = endian_big32(pHeader->speed);
if (info.songs > SIDTUNE_MAX_SONGS)
{
info.songs = SIDTUNE_MAX_SONGS;
}
info.musPlayer = false;
info.sidModel = SIDTUNE_SIDMODEL_UNKNOWN;
info.relocPages = 0;
info.relocStartPage = 0;
if ( endian_big16(pHeader->version) >= 2 )
{
uint_least16_t flags = endian_big16(pHeader->flags);
if (flags & PSID_MUS)
{ // MUS tunes run at any speed
clock = SIDTUNE_CLOCK_ANY;
info.musPlayer = true;
}
#ifdef SIDTUNE_PSID2NG
if (flags & PSID_SPECIFIC)
info.compatibility = SIDTUNE_COMPATIBILITY_PSID;
if (flags & PSID_CLOCK_PAL)
clock |= SIDTUNE_CLOCK_PAL;
if (flags & PSID_CLOCK_NTSC)
clock |= SIDTUNE_CLOCK_NTSC;
info.clockSpeed = clock;
info.sidModel = SIDTUNE_SIDMODEL_UNKNOWN;
if (flags & PSID_SIDMODEL_6581)
info.sidModel |= SIDTUNE_SIDMODEL_6581;
if (flags & PSID_SIDMODEL_8580)
info.sidModel |= SIDTUNE_SIDMODEL_8580;
info.relocStartPage = pHeader->relocStartPage;
info.relocPages = pHeader->relocPages;
#endif // SIDTUNE_PSID2NG
}
// Reserved meaning for possible future use
if ( info.playAddr == 0xffff )
info.playAddr = 0;
// Check reserved fields to force real c64 compliance
if (compatibility == SIDTUNE_COMPATIBILITY_R64)
{
if (checkRealC64Info (speed) == false)
{
info.formatString = _sidtune_invalid;
return false;
}
// Real C64 tunes appear as CIA
speed = ~0;
}
// Create the speed/clock setting table.
convertOldStyleSpeedToTables(speed, clock);
if ( info.loadAddr == 0 )
{
uint_least8_t* pData = (uint_least8_t*)buffer + fileOffset;
info.loadAddr = endian_16( *(pData+1), *pData );
fileOffset += 2;
}
info.c64dataLen = bufLen - fileOffset;
if ( resolveAddrs((uint_least8_t*)buffer + fileOffset) == false )
return false;
if ( checkRelocInfo() == false )
return false;
// Copy info strings, so they will not get lost.
info.numberOfInfoStrings = 3;
// Name
strncpy(&infoString[0][0],pHeader->name,_sidtune_psid_maxStrLen);
info.infoString[0] = &infoString[0][0];
// Author
strncpy(&infoString[1][0],pHeader->author,_sidtune_psid_maxStrLen);
info.infoString[1] = &infoString[1][0];
// Released
strncpy(&infoString[2][0],pHeader->released,_sidtune_psid_maxStrLen);
info.infoString[2] = &infoString[2][0];
return true;
}
#if 0
bool SidTune::PSID_fileSupportSave(std::ofstream& fMyOut, const uint_least8_t* dataBuffer)
{
psidHeader myHeader;
endian_big32((uint_least8_t*)myHeader.id,PSID_ID);
endian_big16(myHeader.version,2);
endian_big16(myHeader.data,sizeof(psidHeader));
endian_big16(myHeader.load,0);
endian_big16(myHeader.init,info.initAddr);
endian_big16(myHeader.play,info.playAddr);
endian_big16(myHeader.songs,info.songs);
endian_big16(myHeader.start,info.startSong);
uint_least32_t speed = 0, check = 0;
uint_least32_t maxBugSongs = ((info.songs <= 32) ? info.songs : 32);
for (uint_least32_t s = 0; s < maxBugSongs; s++)
{
if (songSpeed[s] == SIDTUNE_SPEED_CIA_1A)
speed |= (1<<s);
check |= (1<<s);
}
endian_big32(myHeader.speed,speed);
uint_least16_t tmpFlags = 0;
if ( info.musPlayer )
tmpFlags |= PSID_MUS;
if (info.compatibility == SIDTUNE_COMPATIBILITY_PSID)
tmpFlags |= PSID_SPECIFIC;
tmpFlags |= (info.clockSpeed << 2);
tmpFlags |= (info.sidModel << 4);
endian_big16(myHeader.flags,tmpFlags);
endian_big16(myHeader.reserved,0);
myHeader.relocStartPage = info.relocStartPage;
myHeader.relocPages = info.relocPages;
for ( uint i = 0; i < 32; i++ )
{
myHeader.name[i] = 0;
myHeader.author[i] = 0;
myHeader.released[i] = 0;
}
strncpy( myHeader.name, info.infoString[0], _sidtune_psid_maxStrLen);
strncpy( myHeader.author, info.infoString[1], _sidtune_psid_maxStrLen);
strncpy( myHeader.released, info.infoString[2], _sidtune_psid_maxStrLen);
if (info.compatibility == SIDTUNE_COMPATIBILITY_R64)
{
endian_big32((uint_least8_t*)myHeader.id,RSID_ID);
endian_big16(myHeader.play,0);
endian_big32(myHeader.speed,0);
}
fMyOut.write( (char*)&myHeader, sizeof(psidHeader) );
// Save C64 lo/hi load address (little-endian).
uint_least8_t saveAddr[2];
saveAddr[0] = info.loadAddr & 255;
saveAddr[1] = info.loadAddr >> 8;
fMyOut.write( (char*)saveAddr, 2 ); // !cast!
// Data starts at: bufferaddr + fileoffset
// Data length: datafilelen - fileoffset
fMyOut.write( (const char*)dataBuffer + fileOffset, info.dataFileLen - fileOffset ); // !cast!
if ( !fMyOut )
return false;
else
return true;
}
#endif
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