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mame/src/lib/formats/thom_cas.cpp
Miodrag Milanovic 5a2f80dcde clang-modernize part 5
2015-12-04 07:06:18 +01:00

789 lines
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// license:BSD-3-Clause
// copyright-holders:Antoine Mine
/**********************************************************************
Copyright (C) Antoine Mine' 2006
Thomson 8-bit computers
**********************************************************************/
#include <math.h>
#include <assert.h>
#include "pool.h"
#include "cassimg.h"
#include "thom_cas.h"
/***************************** configuration **************************/
#define K7_SPEED_HACK 0
/* When set to 1, bits extracted from k7 files are not transformed into a
raw wave. It saves some time & memory but disables the ability to "hear" the
cassette.
This does not affect raw wave files.
Also, we do not do this for k5 files because the corresponding wave
files are more compact anyway. */
/* It must be set accordingly in machine/thomson.c */
#define VERBOSE 0 /* 0, 1 or 2 */
/***************************** utilities **************************/
#define PRINT(x) printf x
#define LOG(x) do { if (VERBOSE > 0) printf x; } while (0)
#define VLOG(x) do { if (VERBOSE > 1) printf x; } while (0)
#define TO7_BIT_LENGTH 0.001114
#define TO7_FREQ_CASS_0 4500.
#define TO7_FREQ_CASS_1 6300.
#define TO7_PERIOD_CASS_0 ( 1. / TO7_FREQ_CASS_0 )
#define TO7_PERIOD_CASS_1 ( 1. / TO7_FREQ_CASS_1 )
static UINT32 to7_k7_bitsize;
static UINT8* to7_k7_bits;
#define MO5_BIT_LENGTH 0.000833
#define MO5_HBIT_LENGTH (MO5_BIT_LENGTH / 2.)
/************************* k7 format *************************/
/* The k7 format is widespread among existing Thomson emulators.
It represents the stream of bytes returned by the BIOS cassette routine,
and so, is used by emulators that bypass the BIOS routine.
It is generally hacked from the raw image more or less by hand
(in particular, to by-pass special loaders and copy-protection schemes).
As we run the original BIOS routine, we need to hack back the k7 file
into the original stream.
In theory, the byte stream is a sequence of blocks of the form:
- 2-byte header: 01 3C
- 1-byte type
00 = start of file, the block contains the filename
01 = chunk of file data
FF = end of file
- 1-byte size
- size bytes of data
- one byte of CRC
These are separated by 0xff fillers.
There are also a variety of non-standard blocks, and we try to handle them.
Our main problem is to guess where the places where the motor will be
cut-off and introduce there sequences of 1 bit for synchronization.
Note: as a nice effect, if our routine succeeds, it constructs a wave
file that should be usable on a real computer.
*/
static const struct CassetteModulation to7_k7_modulation =
{
CASSETTE_MODULATION_SQUAREWAVE,
4000.0, 4500.0, 5000.0,
5500.0, 6300.0, 7500.0
};
static casserr_t to7_k7_identify ( cassette_image *cass, struct CassetteOptions *opts )
{
casserr_t e = cassette_modulation_identify( cass, &to7_k7_modulation, opts );
return e;
}
static casserr_t to7_k7_load( cassette_image *cass )
{
#if ! K7_SPEED_HACK
static const INT8 square_wave[] = { -128, 127 };
double time = 0.;
#endif
size_t size = cassette_image_size( cass ), pos = 0;
int i, sz, sz2, bitmax = 1024, invalid = 0;
UINT8 in, typ, block[264];
LOG (( "to7_k7_load: start conversion, size=%li\n", (long)size ));
PRINT (( "to7_k7_load: open cassette, length: %li bytes\n", (long) size ));
if ( to7_k7_bits )
{
free( to7_k7_bits );
to7_k7_bits = nullptr;
}
to7_k7_bitsize = 0;
to7_k7_bits = (UINT8*)malloc(bitmax );
/* store one period */
#if K7_SPEED_HACK
#define K7_PUT( PERIOD )
#else
#define K7_PUT( PERIOD ) \
do \
{ \
casserr_t err; \
err = cassette_put_samples( cass, 0, time, (PERIOD), 2, 1, \
square_wave, CASSETTE_WAVEFORM_8BIT ); \
if ( err ) \
return err; \
time += (PERIOD); \
} while (0)
#endif
/* store one bit */
#define K7_PUT_BIT( BIT ) \
do \
{ \
int b; \
if ( BIT ) \
{ \
for ( b = 0; b < 7; b++ ) \
K7_PUT( TO7_PERIOD_CASS_1 ); \
} \
else \
{ \
for ( b = 0; b < 5; b++ ) \
K7_PUT( TO7_PERIOD_CASS_0 ); \
} \
if ( to7_k7_bitsize + 1 >= bitmax ) \
{ \
UINT8* a = (UINT8*)malloc(bitmax * 2); \
memcpy ( a, to7_k7_bits, bitmax ); \
bitmax *= 2; \
to7_k7_bits = a; \
} \
to7_k7_bits[ to7_k7_bitsize++ ] = (BIT); \
} while (0)
/* store one byte, with start / stop bits */
#define K7_PUT_BYTE( BYTE ) \
do \
{ \
UINT8 x; \
K7_PUT_BIT( 0 ); \
for ( x = 0; x < 8; x++ ) \
K7_PUT_BIT( ( (BYTE) >> x ) & 1 ); \
K7_PUT_BIT( 1 ); \
K7_PUT_BIT( 1 ); \
} while (0)
#define K7_FILL_1( SIZE ) \
do \
{ \
if ( (SIZE) > 0 ) { \
int ii; \
LOG (( "to7_k7_load: 1-filler size=%i bitstart=%i\n", \
(SIZE), to7_k7_bitsize )); \
for ( ii = 0; ii < (SIZE); ii++ ) K7_PUT_BIT( 1 ); \
} \
} while (0)
#define K7_FILL_ff( SIZE ) \
do \
{ \
if ( (SIZE) > 0 ) \
{ \
int ii; \
LOG (( "to7_k7_load: 0xff filler size=%i bitstart=%i\n", (SIZE), to7_k7_bitsize )); \
for ( ii = 0; ii < (SIZE); ii++ ) \
K7_PUT_BYTE( 0xff ); \
} \
} while (0)
/* check format */
cassette_image_read( cass, block, 0, 64 );
for ( i = 3; ; i++ )
{
if ( ( i >= size ) || ( i >= 64 ) )
{
/* ? */
PRINT (( "to7_k7_load: WARNING: this does not look like a MO or TO cassette.\n" ));
break;
}
else if ( ( block[i-3] == 0x01 ) && ( block[i-2] == 0x3c ) && ( block[i-1] == 0x5a ) && ! block[i] )
{
/* MO */
PRINT (( "to7_k7_load: WARNING: this looks like a MO cassette, not a TO one.\n" ));
break;
}
else if ( ( block[i-3] == 0xff ) && ( block[i-2] == 0x01 ) && ( block[i-1] == 0x3c ) && ! block[i] )
{
/* TO */
break;
}
}
/* skip to first 0xff filler */
for ( sz = 0; pos < size; pos++, sz++ )
{
cassette_image_read( cass, &in, pos, 1 );
if ( in == 0xff )
break;
}
if ( sz > 0 )
LOG (( "to7_k7_load: skip %i trash bytes\n", sz ));
/* loop over regular blocks */
while ( pos < size )
{
rebounce:
/* skip 0xff filler */
for ( sz = 0; pos < size; pos++, sz++ )
{
cassette_image_read( cass, &in, pos, 1 );
/* actually, we are bit laxist and treat as 0xff bytes with at least
5 bits out of 8 set to 1
*/
for ( i = 0; in; in >>= 1 )
i += (in & 1);
if ( i < 5 )
break;
}
/* get block header */
if ( pos + 4 > size )
{
pos -= sz;
break;
}
cassette_image_read( cass, block, pos, 4 );
typ = block[2];
sz2 = block[3]+1;
if ( block[0] != 0x01 || block[1] != 0x3c || ( typ != 0x00 && typ != 0x01 && typ != 0xff ) )
{
pos -= sz;
break;
}
pos += 4;
/* get block */
cassette_image_read( cass, block+4, pos, sz2 );
pos += sz2;
/* 1-filler and 0xff-filler */
if ( typ == 0 || typ == 0xff )
K7_FILL_1( 1000 );
K7_FILL_ff( sz );
/* put block */
LOG (( "to7_k7_load: block off=$%x type=$%02X size=%i bitstart=%i\n", (int) pos-sz2-4, typ, sz2, to7_k7_bitsize ));
VLOG (( "to7_k7_load: data:" ));
for ( i = 0; i < sz2 + 4; i ++)
{
VLOG (( " $%02X", block[i] ));
K7_PUT_BYTE( block[i] );
}
VLOG (( "\n" ));
/* if it is a directory enty, says so to the user */
if ( typ == 0 )
{
char name[] = "01234567.ABC";
UINT8 t = block[15];
UINT8 u = block[16];
int p = (to7_k7_bitsize - sz2 - 4 - sz) * TO7_BIT_LENGTH;
memcpy( name, block+4, 8 );
memcpy( name+9, block+12, 3 );
for ( i = 0; name[i]; i++)
{
if ( name[i] < ' ' || name[i] >= 127 )
name[i] = '?';
}
PRINT (( "to7_k7_load: file \"%s\" type=%s,%s at %imn %is\n",
name,
(t==0) ? "bas" : (t==1) ? "dat" : (t==2) ? "bin" : "???",
(u == 0) ? "a" : (u == 0xff) ? "b" : "?",
p / 60, p % 60 ));
}
/* extra 1-fillers */
if ( typ == 0 || typ == 0xff )
K7_FILL_1( 1000 );
}
/* trailing data with invalid block structure
=> dump it in a raw form, but stay alert for hidden block starts
*/
if ( pos < size )
{
invalid++;
LOG (( "to7_k7_load: trailing raw bytes off=$%x bitstart=%i\n", (int) pos, to7_k7_bitsize ));
/* put block */
for (; pos < size; pos++ )
{
cassette_image_read( cass, &in, pos, 1 );
for ( sz = 0; pos < size && in == 0xff; sz++ )
{
pos++;
cassette_image_read( cass, &in, pos, 1 );
}
if ( invalid < 10 && sz > 4 && in == 0x01 && pos + 4 <= size )
{
UINT8 in1,in2;
cassette_image_read( cass, &in1, pos+1, 1 );
cassette_image_read( cass, &in2, pos+2, 1 );
if ( (in1 == 0x3c) && ((in2 == 0x00) || (in2 == 0x01) ) )
{
/* seems we have a regular block hidden in raw data => rebounce */
LOG (( "to7_k7_load: hidden regular block found\n" ));
pos -= sz;
goto rebounce;
}
if ( ( ( in1 == 0x3d ) && ( in2 == 0 ) ) || ( ( in1 == 0x57 ) && ( in2 == 0x49 ) ) )
{
/* special block (Infogrames) => just prepend filler */
K7_FILL_1 ( 500 );
LOG (( "to7_k7_load: special $%02X $%02X $%02X block found off=$%x bitstart=%i\n", in, in1, in2, (int) pos, to7_k7_bitsize ));
}
}
for ( i = 0; i < sz; i++ )
K7_PUT_BYTE( 0xff );
K7_PUT_BYTE( in );
}
}
if ( invalid )
PRINT (( "to7_k7_load: WARNING: the k7 has an unknown structure and may not work\n" ));
sz = to7_k7_bitsize * TO7_BIT_LENGTH;
PRINT (( "to7_k7_load: cassette length: %imn %is (%i samples)\n", sz / 60, sz % 60, to7_k7_bitsize ));
return CASSETTE_ERROR_SUCCESS;
}
static const struct CassetteFormat to7_k7 =
{ "k7", to7_k7_identify, to7_k7_load, nullptr /* no save */ };
/********************* TO7 WAV format ************************/
static casserr_t to7_wav_identify ( cassette_image *cass,
struct CassetteOptions *opts )
{
casserr_t e = wavfile_format.identify( cass, opts );
return e;
}
static casserr_t to7_wav_load ( cassette_image *cass )
{
casserr_t e = wavfile_format.load( cass );
struct CassetteInfo info;
double len;
if ( to7_k7_bits )
{
free( to7_k7_bits );
to7_k7_bits = nullptr;
}
if ( e != CASSETTE_ERROR_SUCCESS )
return e;
cassette_get_info( cass, &info );
len = (double) info.sample_count / info.sample_frequency;
PRINT (( "to7_wav_load: loading cassette, length %imn %is, %i Hz, %i bps, %i bits\n",
(int) len / 60, (int) len % 60,
info.sample_frequency, info.bits_per_sample,
(int) (len / TO7_BIT_LENGTH) ));
return CASSETTE_ERROR_SUCCESS;
}
static casserr_t to7_wav_save ( cassette_image *cass, const struct CassetteInfo *info )
{
int len = info->sample_count / info->sample_frequency;
PRINT (( "to7_wav_save: saving cassette, length %imn %is, %i Hz, %i bps\n", len / 60, len % 60, info->sample_frequency, info->bits_per_sample ));
return wavfile_format.save( cass, info );
}
/* overloaded wav: dump info */
static const struct CassetteFormat to7_wav =
{ "wav", to7_wav_identify, to7_wav_load, to7_wav_save };
/************************* k5 format *************************/
static casserr_t mo5_k5_identify ( cassette_image *cass,
struct CassetteOptions *opts )
{
opts -> bits_per_sample = 8;
opts -> channels = 1;
opts -> sample_frequency = 22100;//11050;
return CASSETTE_ERROR_SUCCESS;
}
/* As the k7 format, the k5 format represents the stream of bytes returned by
the BIOS cassette routine and need to be hacked back into the original
cassette wave.
The format of blocks is a bit different from that of TO7 cassettes:
- 2-byte header is: 3C 5A
- 1-byte type
00 = start of file, the block contains the filename
01 = chunk of file data
FF = end of file
- 1-byte size
- size - 1 bytes of data (255 bytes of data if size = 0)
- one byte of CRC: sum from (and including) header up to (and including)
CRC byte should be 0 modulo 256
They are separated by 0x01 filler bytes (generally 10 of them),
for synchronisation. There are also extra 0 filler bits between certain
kinds of blocks, when the motor is supposed to go off and back on.
*/
static casserr_t mo5_k5_load( cassette_image *cass )
{
size_t size = cassette_image_size( cass ), pos = 0;
int i, sz, sz2, hbit = 0;
UINT8 in, in2, in3, typ, block[264], sum;
int invalid = 0, hbitsize = 0, dcmoto = 0;
LOG (( "mo5_k5_load: start conversion, size=%li\n", (long)size ));
PRINT (( "mo5_k5_load: open cassette, length: %li bytes\n", (long) size ));
/* store a half-bit */
#define K5_PUT_HBIT \
do \
{ \
cassette_put_sample ( cass, 0, hbitsize * MO5_HBIT_LENGTH, MO5_HBIT_LENGTH, (hbit ? 1 : -1) << 30 ); \
hbitsize++; \
} while ( 0 )
/* store one bit */
#define K5_PUT_BIT( BIT ) \
do \
{ \
if ( BIT ) \
{ \
K5_PUT_HBIT; \
hbit = !hbit; \
K5_PUT_HBIT; \
} \
else \
{ \
K5_PUT_HBIT; \
K5_PUT_HBIT; \
} \
hbit = !hbit; \
} while (0)
/* store one byte, no start / stop bit, converse order from TO7 */
#define K5_PUT_BYTE( BYTE ) \
do \
{ \
UINT8 b = BYTE; \
int x; \
for ( x = 0; x < 8; x++ ) \
K5_PUT_BIT( (b >> (7 - x)) & 1 ); \
} while (0)
/* store filler */
#define K5_FILL_0( SIZE ) \
do \
{ \
if ( (SIZE) > 0 ) \
{ \
int j; \
LOG (( "mo5_k5_load: 0-filler size=%i hbitstart=%i\n", (SIZE), hbitsize )); \
for ( j = 0; j < (SIZE); j++ ) \
K5_PUT_BIT( 0 ); \
} \
} while (0)
#define K5_FILL_01( SIZE ) \
do \
{ \
if ( (SIZE) > 0 ) \
{ \
int j; \
LOG (( "mo5_k5_load: 0x01 filler size=%i bitstart=%i\n", (SIZE), hbitsize )); \
for ( j = 0; j < (SIZE); j++ ) \
K5_PUT_BYTE( 0x01 ); \
} \
} while (0)
/* check format */
cassette_image_read( cass, block, 0, 64 );
for ( i = 3; ; i++ )
{
if ( ( i >= size ) || ( i >= 64 ) )
{
/* ? */
PRINT (( "to5_k5_load: WARNING: this does not look like a MO or TO cassette.\n" ));
break;
}
else if ( ( block[i-3] == 0x01 ) && ( block[i-2] == 0x3c ) && ( block[i-1] == 0x5a ) && ! block[i] )
{
/* MO */
break;
}
else if ( ( block[i-3] == 0xff ) && ( block[i-2] == 0x01 ) && ( block[i-1] == 0x3c ) && ! block[i] )
{
/* TO */
PRINT (( "to5_k5_load: WARNING: this looks like a TO cassette, not a MO one.\n" ));
break;
}
}
cassette_image_read( cass, block, pos, 6 );
if ( ! memcmp( block, "DCMOTO", 6 ) || ! memcmp( block, "DCMO5", 5 ) || ! memcmp( block, "DCMO6", 5 ) )
dcmoto = 1;
/* loop over regular blocks */
while ( pos < size )
{
rebounce:
/* skip DCMOTO header*/
if ( dcmoto )
{
cassette_image_read( cass, block, pos, 6 );
if ( ! memcmp( block, "DCMOTO", 6 ) )
{
LOG (( "mo5_k5_load: DCMOTO signature found at off=$%x\n", (int)pos ));
pos += 6;
}
else if ( ! memcmp( block, "DCMO", 4 ) )
{
LOG (( "mo5_k5_load: DCMO* signature found at off=$%x\n", (int)pos ));
pos += 5;
}
}
/* skip 0x01 filler */
for ( sz = 0; pos < size; pos++, sz++ )
{
cassette_image_read( cass, &in, pos, 1 );
if ( in != 0x01 )
break;
}
/* get block header */
if ( pos + 4 > size )
{
pos -= sz;
break;
}
cassette_image_read( cass, block, pos, 4 );
typ = block[2];
sz2 = (UINT8) (block[3]-1);
if ( block[0] != 0x3c || block[1] != 0x5a || ( typ != 0x00 && typ != 0x01 && typ != 0xff ) || pos+sz2 > size )
{
pos -= sz;
break;
}
pos += 4;
/* get block */
cassette_image_read( cass, block+4, pos, sz2 );
pos += sz2;
/* 0-fillers and 0x01-fillers */
if ( typ == 0 || typ == 0xff )
K5_FILL_0( 1200 );
else
K5_FILL_0( 300 ); /* for MO6 */
K5_FILL_01( sz < 10 ? 10 : sz );
/* put block */
LOG (( "mo5_k5_load: block off=$%x type=$%02X size=%i hbitstart=%i\n", (int) pos-sz2-4, typ, sz2, hbitsize ));
VLOG (( "mo5_k5_load: data:" ));
for ( i = 0; i < sz2 + 4; i ++)
{
VLOG (( " $%02X", block[i] ));
K5_PUT_BYTE( block[i] );
}
VLOG (( "\n" ));
/* checksum */
for ( i = 0, sum = 0; i < sz2; i++ )
sum += block[i+4];
if ( sum )
LOG(( "mo5_k5_load: invalid checksum $%02X (should be 0)\n", sum ));
/* if it is a directory enty, says so to the user */
if ( typ == 0 )
{
char name[] = "01234567.ABC";
UINT8 t = block[15];
UINT8 u = block[16];
int p = (hbitsize - sz2 - 4 - sz) * MO5_HBIT_LENGTH;
memcpy( name, block+4, 8 );
memcpy( name+9, block+12, 3 );
for ( i = 0; name[i]; i++)
{
if ( name[i] < ' ' || name[i] >= 127 )
name[i] = '?';
}
PRINT (( "mo5_k5_load: file \"%s\" type=%s,%s at %imn %is\n",
name,
(t==0) ? "bas" : (t==1) ? "dat" : (t==2) ? "bin" : "???",
(u == 0) ? "a" : (u == 0xff) ? "b" : "?",
p / 60, p % 60 ));
}
/* 0-fillers */
if ( typ == 0xff || typ == 0x00 )
K5_FILL_0( 1800 );
}
/* dump trailing bytes, but also look for beginnings of blocks */
if ( pos < size )
{
invalid++;
K5_FILL_0( 1200 );
LOG (( "mo5_k5_load: trailing trash off=$%x size=%i hbitstart=%i\n", (int) pos, (int) (size-pos), hbitsize ));
for ( ; pos < size; pos++ )
{
cassette_image_read( cass, &in, pos, 1 );
if ( dcmoto && in=='D' )
{
/* skip DCMOTO header*/
cassette_image_read( cass, block, pos, 6 );
if ( ! memcmp( block, "DCMOTO", 6 ) )
{
LOG (( "mo5_k5_load: DCMOTO signature found at off=$%x\n", (int)pos ));
pos += 6;
cassette_image_read( cass, &in, pos, 1 );
}
else if ( ! memcmp( block, "DCMO", 4 ) )
{
LOG (( "mo5_k5_load: DCMO* signature found at off=$%x\n", (int)pos ));
pos += 5;
cassette_image_read( cass, &in, pos, 1 );
}
}
for ( sz = 0; pos < size && in == 0x01; sz++ )
{
pos++;
cassette_image_read( cass, &in, pos, 1 );
}
if ( sz > 6 )
{
cassette_image_read( cass, &in2, pos+1, 1 );
cassette_image_read( cass, &in3, pos+2, 1 );
if ( invalid < 10 && in == 0x3c && in2 == 0x5a && (in3 == 0x00 || in3 == 0x01 || in3 == 0xff ) )
{
/* regular block found */
LOG (( "mo5_k5_load: hidden regular block found\n" ));
pos -= sz;
goto rebounce;
}
if ( invalid < 10 && sz > 6 && ( (in == 0x3c && in2 == 0x5a) || (in == 0xc3 && in2 == 0x5a) || (in == 0xc3 && in2 == 0x3c) || (in == 0x87 && in2 == 0x4a) ) )
{
/* special block found */
K5_FILL_0( 1200 );
LOG (( "mo5_k5_load: special block $%02X $%02X found off=$%x hbitstart=%i\n", in, in2, (int) pos-sz, hbitsize ));
}
}
VLOG (( "mo5_k5_load: special data:" ));
for ( i = 0; i < sz; i++ )
{
K5_PUT_BYTE( 0x01 );
VLOG (( " $01" ));
}
K5_PUT_BYTE( in );
VLOG (( " $%02X\n", in ));
}
}
if ( invalid )
PRINT (( "mo5_k5_load: WARNING: the k5 has an unknown structure and may not work\n" ));
sz = hbitsize * MO5_HBIT_LENGTH;
PRINT (( "mo5_k5_load: cassette length: %imn %is (%i half-bits)\n", sz / 60, sz % 60, hbitsize ));
return CASSETTE_ERROR_SUCCESS;
}
static const struct CassetteFormat mo5_k5 =
{ "k5,k7", mo5_k5_identify, mo5_k5_load, nullptr /* no save */ };
/********************* MO5 WAV format ************************/
static casserr_t mo5_wav_identify ( cassette_image *cass,
struct CassetteOptions *opts )
{
casserr_t e = wavfile_format.identify( cass, opts );
return e;
}
static casserr_t mo5_wav_load ( cassette_image *cass )
{
casserr_t e = wavfile_format.load( cass );
struct CassetteInfo info;
int len;
if ( e == CASSETTE_ERROR_SUCCESS )
{
cassette_get_info( cass, &info );
len = info.sample_count / info.sample_frequency;
PRINT (( "mo5_wav_load: loading cassette, length %imn %is, %i Hz, %i bps\n", len / 60, len % 60, info.sample_frequency, info.bits_per_sample ));
}
return e;
}
static casserr_t mo5_wav_save ( cassette_image *cass, const struct CassetteInfo *info )
{
int len = info->sample_count / info->sample_frequency;
PRINT (( "mo5_wav_save: saving cassette, length %imn %is, %i Hz, %i bps\n", len / 60, len % 60, info->sample_frequency, info->bits_per_sample ));
return wavfile_format.save( cass, info );
}
/* overloaded wav: dump info */
static const struct CassetteFormat mo5_wav =
{ "wav", mo5_wav_identify, mo5_wav_load, mo5_wav_save };
/********************* formats ************************/
const struct CassetteFormat *const to7_cassette_formats[] =
{ &to7_wav, &to7_k7, nullptr };
const struct CassetteFormat *const mo5_cassette_formats[] =
{ &mo5_wav, &mo5_k5, nullptr };
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