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fdi2raw.cpp
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fdi2raw.cpp
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/*
FDI to raw bit stream converter
Copyright (c) 2001 by Toni Wilen <twilen@arabuusimiehet.com>
FDI 2.0 support
Copyright (c) 2003-2004 by Toni Wilen <twilen@arabuusimiehet.com>
and Vincent Joguin
FDI format created by Vincent "ApH" Joguin
Tiny changes - function type fixes, multiple drives, addition of
get_last_head and C++ callability - by Thomas Harte, 2001,
T.Harte@excite.co.uk
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>
/* IF UAE */
#include "sysconfig.h"
#include "sysdeps.h"
#include "zfile.h"
#include "uae.h"
/* ELSE */
//#include "types.h"
#include "fdi2raw.h"
#include "crc32.h"
#undef DEBUG
#define VERBOSE
#include <assert.h>
#ifdef DEBUG
static TCHAR *datalog (uae_u8 *src, int len)
{
static TCHAR buf[1000];
static int offset;
int i = 0, offset2;
offset2 = offset;
buf[offset++]='\'';
while (len--) {
_stprintf (buf + offset, "%02X", src[i]);
offset += 2;
i++;
if (i > 10) break;
}
buf[offset++]='\'';
buf[offset++] = 0;
if (offset >= 900) offset = 0;
return buf + offset2;
}
#else
static TCHAR *datalog (uae_u8 *src, int len) { return L""; }
#endif
#ifdef DEBUG
#define debuglog write_log
#else
#define debuglog
#endif
#ifdef VERBOSE
#define outlog write_log
#else
#define outlog
#endif
static int fdi_allocated;
#ifdef DEBUG
static void fdi_free (void *p)
{
int size;
if (!p)
return;
size = ((int*)p)[-1];
fdi_allocated -= size;
write_log (L"%d freed (%d)\n", size, fdi_allocated);
free ((int*)p - 1);
}
static void *fdi_malloc (int size)
{
void *p = xmalloc (size + sizeof (int));
((int*)p)[0] = size;
fdi_allocated += size;
write_log (L"%d allocated (%d)\n", size, fdi_allocated);
return (int*)p + 1;
}
#else
#define fdi_free xfree
#define fdi_malloc xmalloc
#endif
#define MAX_SRC_BUFFER 4194304
#define MAX_DST_BUFFER 40000
#define MAX_MFM_SYNC_BUFFER 60000
#define MAX_TIMING_BUFFER 400000
#define MAX_TRACKS 168
struct fdi_cache {
uae_u32 *avgp, *minp, *maxp;
uae_u8 *idxp;
int avg_free, idx_free, min_free, max_free;
uae_u32 totalavg, pulses, maxidx, indexoffset;
int weakbits;
int lowlevel;
};
struct fdi {
uae_u8 *track_src_buffer;
uae_u8 *track_src;
int track_src_len;
uae_u8 *track_dst_buffer;
uae_u8 *track_dst;
uae_u16 *track_dst_buffer_timing;
uae_u8 track_len;
uae_u8 track_type;
int current_track;
int last_track;
int last_head;
int rotation_speed;
int bit_rate;
int disk_type;
int write_protect;
int reversed_side;
int err;
uae_u8 header[2048];
int track_offsets[MAX_TRACKS];
struct zfile *file;
int out;
int mfmsync_offset;
int *mfmsync_buffer;
/* sector described only */
int index_offset;
int encoding_type;
/* bit handling */
int nextdrop;
struct fdi_cache cache[MAX_TRACKS];
};
#define get_u32(x) ((((x)[0])<<24)|(((x)[1])<<16)|(((x)[2])<<8)|((x)[3]))
#define get_u24(x) ((((x)[0])<<16)|(((x)[1])<<8)|((x)[2]))
STATIC_INLINE void put_u32 (uae_u8 *d, uae_u32 v)
{
d[0] = v >> 24;
d[1] = v >> 16;
d[2] = v >> 8;
d[3] = v;
}
struct node {
uae_u16 v;
struct node *left;
struct node *right;
};
typedef struct node NODE;
static uae_u8 temp, temp2;
static uae_u8 *expand_tree (uae_u8 *stream, NODE *node)
{
if (temp & temp2) {
fdi_free (node->left);
node->left = 0;
fdi_free (node->right);
node->right = 0;
temp2 >>= 1;
if (!temp2) {
temp = *stream++;
temp2 = 0x80;
}
return stream;
} else {
uae_u8 *stream_temp;
temp2 >>= 1;
if (!temp2) {
temp = *stream++;
temp2 = 0x80;
}
node->left = fdi_malloc (NODE, 1);
memset (node->left, 0, sizeof (NODE));
stream_temp = expand_tree (stream, node->left);
node->right = fdi_malloc (NODE ,1);
memset (node->right, 0, sizeof (NODE));
return expand_tree (stream_temp, node->right);
}
}
static uae_u8 *values_tree8 (uae_u8 *stream, NODE *node)
{
if (node->left == 0) {
node->v = *stream++;
return stream;
} else {
uae_u8 *stream_temp = values_tree8 (stream, node->left);
return values_tree8 (stream_temp, node->right);
}
}
static uae_u8 *values_tree16 (uae_u8 *stream, NODE *node)
{
if (node->left == 0) {
uae_u16 high_8_bits = (*stream++) << 8;
node->v = high_8_bits | (*stream++);
return stream;
} else {
uae_u8 *stream_temp = values_tree16 (stream, node->left);
return values_tree16 (stream_temp, node->right);
}
}
static void free_nodes (NODE *node)
{
if (node) {
free_nodes (node->left);
free_nodes (node->right);
fdi_free (node);
}
}
static uae_u32 sign_extend16 (uae_u32 v)
{
if (v & 0x8000)
v |= 0xffff0000;
return v;
}
static uae_u32 sign_extend8 (uae_u32 v)
{
if (v & 0x80)
v |= 0xffffff00;
return v;
}
static void fdi_decode (uae_u8 *stream, int size, uae_u8 *out)
{
int i;
uae_u8 sign_extend, sixteen_bit, sub_stream_shift;
NODE root;
NODE *current_node;
memset (out, 0, size * 4);
sub_stream_shift = 1;
while (sub_stream_shift) {
//sub-stream header decode
sign_extend = *stream++;
sub_stream_shift = sign_extend & 0x7f;
sign_extend &= 0x80;
sixteen_bit = (*stream++) & 0x80;
//huffman tree architecture decode
temp = *stream++;
temp2 = 0x80;
stream = expand_tree (stream, &root);
if (temp2 == 0x80)
stream--;
//huffman output values decode
if (sixteen_bit)
stream = values_tree16 (stream, &root);
else
stream = values_tree8 (stream, &root);
//sub-stream data decode
temp2 = 0;
for (i = 0; i < size; i++) {
uae_u32 v;
uae_u8 decode = 1;
current_node = &root;
while (decode) {
if (current_node->left == 0) {
decode = 0;
} else {
temp2 >>= 1;
if (!temp2) {
temp2 = 0x80;
temp = *stream++;
}
if (temp & temp2)
current_node = current_node->right;
else
current_node = current_node->left;
}
}
v = ((uae_u32*)out)[i];
if (sign_extend) {
if (sixteen_bit)
v |= sign_extend16 (current_node->v) << sub_stream_shift;
else
v |= sign_extend8 (current_node->v) << sub_stream_shift;
} else {
v |= current_node->v << sub_stream_shift;
}
((uae_u32*)out)[i] = v;
}
free_nodes (root.left);
free_nodes (root.right);
}
}
static int decode_raw_track (FDI *fdi)
{
int size = get_u32(fdi->track_src);
memcpy (fdi->track_dst, fdi->track_src, (size + 7) >> 3);
fdi->track_src += (size + 7) >> 3;
return size;
}
/* unknown track */
static void zxx (FDI *fdi)
{
outlog (L"track %d: unknown track type 0x%02X\n", fdi->current_track, fdi->track_type);
// return -1;
}
/* unsupported track */
static void zyy (FDI *fdi)
{
outlog (L"track %d: unsupported track type 0x%02X\n", fdi->current_track, fdi->track_type);
// return -1;
}
/* empty track */
static void track_empty (FDI *fdi)
{
// return 0;
}
/* unknown sector described type */
static void dxx (FDI *fdi)
{
outlog (L"\ntrack %d: unknown sector described type 0x%02X\n", fdi->current_track, fdi->track_type);
fdi->err = 1;
}
/* unsupported sector described type */
static void dyy (FDI *fdi)
{
outlog (L"\ntrack %d: unsupported sector described 0x%02X\n", fdi->current_track, fdi->track_type);
fdi->err = 1;
}
/* add position of mfm sync bit */
static void add_mfm_sync_bit (FDI *fdi)
{
if (fdi->nextdrop) {
fdi->nextdrop = 0;
return;
}
fdi->mfmsync_buffer[fdi->mfmsync_offset++] = fdi->out;
if (fdi->out == 0) {
outlog (L"illegal position for mfm sync bit, offset=%d\n",fdi->out);
fdi->err = 1;
}
if (fdi->mfmsync_offset >= MAX_MFM_SYNC_BUFFER) {
fdi->mfmsync_offset = 0;
outlog (L"mfmsync buffer overflow\n");
fdi->err = 1;
}
fdi->out++;
}
#define BIT_BYTEOFFSET ((fdi->out) >> 3)
#define BIT_BITOFFSET (7-((fdi->out)&7))
/* add one bit */
static void bit_add (FDI *fdi, int bit)
{
if (fdi->nextdrop) {
fdi->nextdrop = 0;
return;
}
fdi->track_dst[BIT_BYTEOFFSET] &= ~(1 << BIT_BITOFFSET);
if (bit)
fdi->track_dst[BIT_BYTEOFFSET] |= (1 << BIT_BITOFFSET);
fdi->out++;
if (fdi->out >= MAX_DST_BUFFER * 8) {
outlog (L"destination buffer overflow\n");
fdi->err = 1;
fdi->out = 1;
}
}
/* add bit and mfm sync bit */
static void bit_mfm_add (FDI *fdi, int bit)
{
add_mfm_sync_bit (fdi);
bit_add (fdi, bit);
}
/* remove following bit */
static void bit_drop_next (FDI *fdi)
{
if (fdi->nextdrop > 0) {
outlog (L"multiple bit_drop_next() called");
} else if (fdi->nextdrop < 0) {
fdi->nextdrop = 0;
debuglog (":DNN:");
return;
}
debuglog (":DN:");
fdi->nextdrop = 1;
}
/* ignore next bit_drop_next() */
static void bit_dedrop (FDI *fdi)
{
if (fdi->nextdrop) {
outlog (L"bit_drop_next called before bit_dedrop");
}
fdi->nextdrop = -1;
debuglog (":BDD:");
}
/* add one byte */
static void byte_add (FDI *fdi, uae_u8 v)
{
int i;
for (i = 7; i >= 0; i--)
bit_add (fdi, v & (1 << i));
}
/* add one word */
static void word_add (FDI *fdi, uae_u16 v)
{
byte_add (fdi, (uae_u8)(v >> 8));
byte_add (fdi, (uae_u8)v);
}
/* add one byte and mfm encode it */
static void byte_mfm_add (FDI *fdi, uae_u8 v)
{
int i;
for (i = 7; i >= 0; i--)
bit_mfm_add (fdi, v & (1 << i));
}
/* add multiple bytes and mfm encode them */
static void bytes_mfm_add (FDI *fdi, uae_u8 v, int len)
{
int i;
for (i = 0; i < len; i++) byte_mfm_add (fdi, v);
}
/* add one mfm encoded word and re-mfm encode it */
static void word_post_mfm_add (FDI *fdi, uae_u16 v)
{
int i;
for (i = 14; i >= 0; i -= 2)
bit_mfm_add (fdi, v & (1 << i));
}
/* bit 0 */
static void s00(FDI *fdi) { bit_add (fdi, 0); }
/* bit 1*/
static void s01(FDI *fdi) { bit_add (fdi, 1); }
/* 4489 */
static void s02(FDI *fdi) { word_add (fdi, 0x4489); }
/* 5224 */
static void s03(FDI *fdi) { word_add (fdi, 0x5224); }
/* mfm sync bit */
static void s04(FDI *fdi) { add_mfm_sync_bit (fdi); }
/* RLE MFM-encoded data */
static void s08(FDI *fdi)
{
int bytes = *fdi->track_src++;
uae_u8 byte = *fdi->track_src++;
if (bytes == 0) bytes = 256;
debuglog ("s08:len=%d,data=%02X",bytes,byte);
while(bytes--) byte_add (fdi, byte);
}
/* RLE MFM-decoded data */
static void s09(FDI *fdi)
{
int bytes = *fdi->track_src++;
uae_u8 byte = *fdi->track_src++;
if (bytes == 0) bytes = 256;
bit_drop_next (fdi);
debuglog ("s09:len=%d,data=%02X",bytes,byte);
while(bytes--) byte_mfm_add (fdi, byte);
}
/* MFM-encoded data */
static void s0a(FDI *fdi)
{
int i, bits = (fdi->track_src[0] << 8) | fdi->track_src[1];
uae_u8 b;
fdi->track_src += 2;
debuglog ("s0a:bits=%d,data=%s", bits, datalog (fdi->track_src, (bits + 7) / 8));
while (bits >= 8) {
byte_add (fdi, *fdi->track_src++);
bits -= 8;
}
if (bits > 0) {
i = 7;
b = *fdi->track_src++;
while (bits--) {
bit_add (fdi, b & (1 << i));
i--;
}
}
}
/* MFM-encoded data */
static void s0b(FDI *fdi)
{
int i, bits = ((fdi->track_src[0] << 8) | fdi->track_src[1]) + 65536;
uae_u8 b;
fdi->track_src += 2;
debuglog ("s0b:bits=%d,data=%s", bits, datalog (fdi->track_src, (bits + 7) / 8));
while (bits >= 8) {
byte_add (fdi, *fdi->track_src++);
bits -= 8;
}
if (bits > 0) {
i = 7;
b = *fdi->track_src++;
while (bits--) {
bit_add (fdi, b & (1 << i));
i--;
}
}
}
/* MFM-decoded data */
static void s0c(FDI *fdi)
{
int i, bits = (fdi->track_src[0] << 8) | fdi->track_src[1];
uae_u8 b;
fdi->track_src += 2;
bit_drop_next (fdi);
debuglog ("s0c:bits=%d,data=%s", bits, datalog (fdi->track_src, (bits + 7) / 8));
while (bits >= 8) {
byte_mfm_add (fdi, *fdi->track_src++);
bits -= 8;
}
if (bits > 0) {
i = 7;
b = *fdi->track_src++;
while(bits--) {
bit_mfm_add (fdi, b & (1 << i));
i--;
}
}
}
/* MFM-decoded data */
static void s0d(FDI *fdi)
{
int i, bits = ((fdi->track_src[0] << 8) | fdi->track_src[1]) + 65536;
uae_u8 b;
fdi->track_src += 2;
bit_drop_next (fdi);
debuglog ("s0d:bits=%d,data=%s", bits, datalog (fdi->track_src, (bits + 7) / 8));
while (bits >= 8) {
byte_mfm_add (fdi, *fdi->track_src++);
bits -= 8;
}
if (bits > 0) {
i = 7;
b = *fdi->track_src++;
while(bits--) {
bit_mfm_add (fdi, b & (1 << i));
i--;
}
}
}
/* ***** */
/* AMIGA */
/* ***** */
/* just for testing integrity of Amiga sectors */
static void rotateonebit (uae_u8 *start, uae_u8 *end, int shift)
{
if (shift == 0)
return;
while (start <= end) {
start[0] <<= shift;
start[0] |= start[1] >> (8 - shift);
start++;
}
}
static int check_offset;
static uae_u16 getmfmword (uae_u8 *mbuf)
{
uae_u32 v;
v = (mbuf[0] << 8) | (mbuf[1] << 0);
if (check_offset == 0)
return v;
v <<= 8;
v |= mbuf[2];
v >>= check_offset;
return v;
}
#define MFMMASK 0x55555555
static uae_u32 getmfmlong (uae_u8 * mbuf)
{
return ((getmfmword (mbuf) << 16) | getmfmword (mbuf + 2)) & MFMMASK;
}
static int amiga_check_track (FDI *fdi)
{
int i, j, secwritten = 0;
int fwlen = fdi->out / 8;
int length = 2 * fwlen;
int drvsec = 11;
uae_u32 odd, even, chksum, id, dlong;
uae_u8 *secdata;
uae_u8 secbuf[544];
uae_u8 bigmfmbuf[60000];
uae_u8 *mbuf, *mbuf2, *mend;
TCHAR sectable[22];
uae_u8 *raw = fdi->track_dst_buffer;
int slabel, off;
int ok = 1;
memset (bigmfmbuf, 0, sizeof (bigmfmbuf));
mbuf = bigmfmbuf;
check_offset = 0;
for (i = 0; i < (fdi->out + 7) / 8; i++)
*mbuf++ = raw[i];
off = fdi->out & 7;
#if 1
if (off > 0) {
mbuf--;
*mbuf &= ~((1 << (8 - off)) - 1);
}
j = 0;
while (i < (fdi->out + 7) / 8 + 600) {
*mbuf++ |= (raw[j] >> off) | ((raw[j + 1]) << (8 - off));
j++;
i++;
}
#endif
mbuf = bigmfmbuf;
memset (sectable, 0, sizeof (sectable));
//memcpy (mbuf + fwlen, mbuf, fwlen * sizeof (uae_u16));
mend = bigmfmbuf + length;
mend -= (4 + 16 + 8 + 512);
while (secwritten < drvsec) {
int trackoffs;
for (;;) {
rotateonebit (bigmfmbuf, mend, 1);
if (getmfmword (mbuf) == 0)
break;
if (secwritten == 10) {
mbuf[0] = 0x44;
mbuf[1] = 0x89;
}
// check_offset++;
if (check_offset > 7) {
check_offset = 0;
mbuf++;
if (mbuf >= mend || *mbuf == 0)
break;
}
if (getmfmword (mbuf) == 0x4489)
break;
}
if (mbuf >= mend || *mbuf == 0)
break;
rotateonebit (bigmfmbuf, mend, check_offset);
check_offset = 0;
while (getmfmword (mbuf) == 0x4489)
mbuf+= 1 * 2;
mbuf2 = mbuf + 8;
odd = getmfmlong (mbuf);
even = getmfmlong (mbuf + 2 * 2);
mbuf += 4 * 2;
id = (odd << 1) | even;
trackoffs = (id & 0xff00) >> 8;
if (trackoffs + 1 > drvsec) {
outlog (L"illegal sector offset %d\n",trackoffs);
ok = 0;
mbuf = mbuf2;
continue;
}
if ((id >> 24) != 0xff) {
outlog (L"sector %d format type %02X?\n", trackoffs, id >> 24);
ok = 0;
}
chksum = odd ^ even;
slabel = 0;
for (i = 0; i < 4; i++) {
odd = getmfmlong (mbuf);
even = getmfmlong (mbuf + 8 * 2);
mbuf += 2* 2;
dlong = (odd << 1) | even;
if (dlong) slabel = 1;
chksum ^= odd ^ even;
}
mbuf += 8 * 2;
odd = getmfmlong (mbuf);
even = getmfmlong (mbuf + 2 * 2);
mbuf += 4 * 2;
if (((odd << 1) | even) != chksum) {
outlog (L"sector %d header crc error\n", trackoffs);
ok = 0;
mbuf = mbuf2;
continue;
}
outlog (L"sector %d header crc ok\n", trackoffs);
if (((id & 0x00ff0000) >> 16) != (uae_u32)fdi->current_track) {
outlog (L"illegal track number %d <> %d\n",fdi->current_track,(id & 0x00ff0000) >> 16);
ok++;
mbuf = mbuf2;
continue;
}
odd = getmfmlong (mbuf);
even = getmfmlong (mbuf + 2 * 2);
mbuf += 4 * 2;
chksum = (odd << 1) | even;
secdata = secbuf + 32;
for (i = 0; i < 128; i++) {
odd = getmfmlong (mbuf);
even = getmfmlong (mbuf + 256 * 2);
mbuf += 2 * 2;
dlong = (odd << 1) | even;
*secdata++ = (uae_u8) (dlong >> 24);
*secdata++ = (uae_u8) (dlong >> 16);
*secdata++ = (uae_u8) (dlong >> 8);
*secdata++ = (uae_u8) dlong;
chksum ^= odd ^ even;
}
mbuf += 256 * 2;
if (chksum) {
outlog (L"sector %d data checksum error\n",trackoffs);
ok = 0;
} else if (sectable[trackoffs]) {
outlog (L"sector %d already found?\n", trackoffs);
mbuf = mbuf2;
} else {
outlog (L"sector %d ok\n",trackoffs);
if (slabel) outlog (L"(non-empty sector header)\n");
sectable[trackoffs] = 1;
secwritten++;
if (trackoffs == 9)
mbuf += 0x228;
}
}
for (i = 0; i < drvsec; i++) {
if (!sectable[i]) {
outlog (L"sector %d missing\n", i);
ok = 0;
}
}
return ok;
}
static void amiga_data_raw (FDI *fdi, uae_u8 *secbuf, uae_u8 *crc, int len)
{
int i;
uae_u8 crcbuf[4];
if (!crc) {
memset (crcbuf, 0, 4);
} else {
memcpy (crcbuf, crc ,4);
}
for (i = 0; i < 4; i++)
byte_mfm_add (fdi, crcbuf[i]);
for (i = 0; i < len; i++)
byte_mfm_add (fdi, secbuf[i]);
}
static void amiga_data (FDI *fdi, uae_u8 *secbuf)
{
uae_u16 mfmbuf[4 + 512];
uae_u32 dodd, deven, dck;
int i;
for (i = 0; i < 512; i += 4) {
deven = ((secbuf[i + 0] << 24) | (secbuf[i + 1] << 16)
| (secbuf[i + 2] << 8) | (secbuf[i + 3]));
dodd = deven >> 1;
deven &= 0x55555555;
dodd &= 0x55555555;
mfmbuf[(i >> 1) + 4] = (uae_u16) (dodd >> 16);
mfmbuf[(i >> 1) + 5] = (uae_u16) dodd;
mfmbuf[(i >> 1) + 256 + 4] = (uae_u16) (deven >> 16);
mfmbuf[(i >> 1) + 256 + 5] = (uae_u16) deven;
}
dck = 0;
for (i = 4; i < 4 + 512; i += 2)
dck ^= (mfmbuf[i] << 16) | mfmbuf[i + 1];
deven = dodd = dck;
dodd >>= 1;
deven &= 0x55555555;
dodd &= 0x55555555;
mfmbuf[0] = (uae_u16) (dodd >> 16);
mfmbuf[1] = (uae_u16) dodd;
mfmbuf[2] = (uae_u16) (deven >> 16);
mfmbuf[3] = (uae_u16) deven;
for (i = 0; i < 4 + 512; i ++)
word_post_mfm_add (fdi, mfmbuf[i]);
}
static void amiga_sector_header (FDI *fdi, uae_u8 *header, uae_u8 *data, int sector, int untilgap)
{
uae_u8 headerbuf[4], databuf[16];
uae_u32 deven, dodd, hck;
uae_u16 mfmbuf[24];
int i;
byte_mfm_add (fdi, 0);
byte_mfm_add (fdi, 0);
word_add (fdi, 0x4489);
word_add (fdi, 0x4489);
if (header) {
memcpy (headerbuf, header, 4);
} else {
headerbuf[0] = 0xff;
headerbuf[1] = (uae_u8)fdi->current_track;
headerbuf[2] = (uae_u8)sector;
headerbuf[3] = (uae_u8)untilgap;
}
if (data)
memcpy (databuf, data, 16);
else
memset (databuf, 0, 16);
deven = ((headerbuf[0] << 24) | (headerbuf[1] << 16)
| (headerbuf[2] << 8) | (headerbuf[3]));
dodd = deven >> 1;
deven &= 0x55555555;
dodd &= 0x55555555;
mfmbuf[0] = (uae_u16) (dodd >> 16);
mfmbuf[1] = (uae_u16) dodd;
mfmbuf[2] = (uae_u16) (deven >> 16);
mfmbuf[3] = (uae_u16) deven;
for (i = 0; i < 16; i += 4) {
deven = ((databuf[i] << 24) | (databuf[i + 1] << 16)
| (databuf[i + 2] << 8) | (databuf[i + 3]));
dodd = deven >> 1;
deven &= 0x55555555;
dodd &= 0x55555555;
mfmbuf[(i >> 1) + 0 + 4] = (uae_u16) (dodd >> 16);
mfmbuf[(i >> 1) + 0 + 5] = (uae_u16) dodd;
mfmbuf[(i >> 1) + 8 + 4] = (uae_u16) (deven >> 16);
mfmbuf[(i >> 1) + 8 + 5] = (uae_u16) deven;
}
hck = 0;
for (i = 0; i < 4 + 16; i += 2)
hck ^= (mfmbuf[i] << 16) | mfmbuf[i + 1];
deven = dodd = hck;
dodd >>= 1;
deven &= 0x55555555;
dodd &= 0x55555555;
mfmbuf[20] = (uae_u16) (dodd >> 16);
mfmbuf[21] = (uae_u16) dodd;
mfmbuf[22] = (uae_u16) (deven >> 16);
mfmbuf[23] = (uae_u16) deven;
for (i = 0; i < 4 + 16 + 4; i ++)
word_post_mfm_add (fdi, mfmbuf[i]);
}
/* standard super-extended Amiga sector header */
static void s20 (FDI *fdi)
{
bit_drop_next (fdi);
debuglog ("s20:header=%s,data=%s", datalog (fdi->track_src, 4), datalog (fdi->track_src + 4, 16));
amiga_sector_header (fdi, fdi->track_src, fdi->track_src + 4, 0, 0);
fdi->track_src += 4 + 16;
}
/* standard extended Amiga sector header */
static void s21 (FDI *fdi)
{
bit_drop_next (fdi);
debuglog ("s21:header=%s", datalog (fdi->track_src, 4));
amiga_sector_header (fdi, fdi->track_src, 0, 0, 0);
fdi->track_src += 4;
}
/* standard Amiga sector header */
static void s22 (FDI *fdi)
{
bit_drop_next (fdi);
debuglog ("s22:sector=%d,untilgap=%d", fdi->track_src[0], fdi->track_src[1]);
amiga_sector_header (fdi, 0, 0, fdi->track_src[0], fdi->track_src[1]);
fdi->track_src += 2;
}
/* standard 512-byte, CRC-correct Amiga data */
static void s23 (FDI *fdi)
{
debuglog ("s23:data=%s", datalog (fdi->track_src, 512));
amiga_data (fdi, fdi->track_src);
fdi->track_src += 512;
}
/* not-decoded, 128*2^x-byte, CRC-correct Amiga data */
static void s24 (FDI *fdi)
{
int shift = *fdi->track_src++;
debuglog ("s24:shift=%d,data=%s", shift, datalog (fdi->track_src, 128 << shift));
amiga_data_raw (fdi, fdi->track_src, 0, 128 << shift);
fdi->track_src += 128 << shift;
}
/* not-decoded, 128*2^x-byte, CRC-incorrect Amiga data */
static void s25 (FDI *fdi)
{
int shift = *fdi->track_src++;
debuglog ("s25:shift=%d,crc=%s,data=%s", shift, datalog (fdi->track_src, 4), datalog (fdi->track_src + 4, 128 << shift));
amiga_data_raw (fdi, fdi->track_src + 4, fdi->track_src, 128 << shift);
fdi->track_src += 4 + (128 << shift);
}
/* standard extended Amiga sector */
static void s26 (FDI *fdi)
{
s21 (fdi);
debuglog ("s26:data=%s", datalog (fdi->track_src, 512));
amiga_data (fdi, fdi->track_src);
fdi->track_src += 512;
}
/* standard short Amiga sector */
static void s27 (FDI *fdi)
{
s22 (fdi);
debuglog ("s27:data=%s", datalog (fdi->track_src, 512));
amiga_data (fdi, fdi->track_src);
fdi->track_src += 512;
}
/* *** */
/* IBM */
/* *** */
static uae_u16 ibm_crc (uae_u8 byte, int reset)
{
static uae_u16 crc;
int i;
if (reset) crc = 0xcdb4;
for (i = 0; i < 8; i++) {
if (crc & 0x8000) {
crc <<= 1;
if (!(byte & 0x80)) crc ^= 0x1021;
} else {
crc <<= 1;
if (byte & 0x80) crc ^= 0x1021;
}
byte <<= 1;
}
return crc;
}
static void ibm_data (FDI *fdi, uae_u8 *data, uae_u8 *crc, int len)
{
int i;
uae_u8 crcbuf[2];
uae_u16 crcv;
word_add (fdi, 0x4489);
word_add (fdi, 0x4489);
word_add (fdi, 0x4489);
byte_mfm_add (fdi, 0xfb);
ibm_crc (0xfb, 1);
for (i = 0; i < len; i++) {
byte_mfm_add (fdi, data[i]);
crcv = ibm_crc (data[i], 0);
}
if (!crc) {
crc = crcbuf;
crc[0] = (uae_u8)(crcv >> 8);
crc[1] = (uae_u8)crcv;
}
byte_mfm_add (fdi, crc[0]);
byte_mfm_add (fdi, crc[1]);
}
static void ibm_sector_header (FDI *fdi, uae_u8 *data, uae_u8 *crc, int secnum, int pre)
{
uae_u8 secbuf[5];
uae_u8 crcbuf[2];
uae_u16 crcv;
int i;
if (pre)
bytes_mfm_add (fdi, 0, 12);
word_add (fdi, 0x4489);
word_add (fdi, 0x4489);
word_add (fdi, 0x4489);