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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
cdrom.c
Generic MAME CD-ROM utilties - build IDE and SCSI CD-ROMs on top of this
****************************************************************************
IMPORTANT:
"physical" block addresses are the actual addresses on the emulated CD.
"chd" block addresses are the block addresses in the CHD file.
Because we pad each track to a 4-frame boundary, these addressing
schemes will differ after track 1!
***************************************************************************/
#include <assert.h>
#include "cdrom.h"
#include <stdlib.h>
#include "chdcd.h"
/***************************************************************************
DEBUGGING
***************************************************************************/
/** @brief The verbose. */
#define VERBOSE (0)
#if VERBOSE
/**
* @def LOG(x) do
*
* @brief A macro that defines log.
*
* @param x The void to process.
*/
#define LOG(x) do { if (VERBOSE) logerror x; } while (0)
/**
* @fn void CLIB_DECL logerror(const char *text, ...) ATTR_PRINTF(1,2);
*
* @brief Logerrors the given text.
*
* @param text The text.
*
* @return A CLIB_DECL.
*/
void CLIB_DECL logerror(const char *text, ...) ATTR_PRINTF(1,2);
#else
/**
* @def LOG(x);
*
* @brief A macro that defines log.
*
* @param x The void to process.
*/
#define LOG(x)
#endif
/***************************************************************************
CONSTANTS
***************************************************************************/
/** @brief offset within sector. */
const int SYNC_OFFSET = 0x000;
/** @brief 12 bytes. */
const int SYNC_NUM_BYTES = 12;
/** @brief offset within sector. */
const int MODE_OFFSET = 0x00f;
/** @brief offset within sector. */
const int ECC_P_OFFSET = 0x81c;
/** @brief 2 lots of 86. */
const int ECC_P_NUM_BYTES = 86;
/** @brief 24 bytes each. */
const int ECC_P_COMP = 24;
/** @brief The ECC q offset. */
const int ECC_Q_OFFSET = ECC_P_OFFSET + 2 * ECC_P_NUM_BYTES;
/** @brief 2 lots of 52. */
const int ECC_Q_NUM_BYTES = 52;
/** @brief 43 bytes each. */
const int ECC_Q_COMP = 43;
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
/**
* @struct cdrom_file
*
* @brief A cdrom file.
*/
struct cdrom_file
{
/** @brief The chd. */
chd_file * chd; /* CHD file */
/** @brief The cdtoc. */
cdrom_toc cdtoc; /* TOC for the CD */
/** @brief Information describing the track. */
chdcd_track_input_info track_info; /* track info */
/** @brief The fhandle[ CD maximum tracks]. */
util::core_file::ptr fhandle[CD_MAX_TRACKS];/* file handle */
};
/***************************************************************************
INLINE FUNCTIONS
***************************************************************************/
/*-------------------------------------------------
physical_to_chd_lba - find the CHD LBA
and the track number
-------------------------------------------------*/
/**
* @fn static inline uint32_t physical_to_chd_lba(cdrom_file *file, uint32_t physlba, uint32_t &tracknum)
*
* @brief Physical to chd lba.
*
* @param [in,out] file If non-null, the file.
* @param physlba The physlba.
* @param [in,out] tracknum The tracknum.
*
* @return An uint32_t.
*/
static inline uint32_t physical_to_chd_lba(cdrom_file *file, uint32_t physlba, uint32_t &tracknum)
{
uint32_t chdlba;
int track;
/* loop until our current LBA is less than the start LBA of the next track */
for (track = 0; track < file->cdtoc.numtrks; track++)
if (physlba < file->cdtoc.tracks[track + 1].physframeofs)
{
chdlba = physlba - file->cdtoc.tracks[track].physframeofs + file->cdtoc.tracks[track].chdframeofs;
tracknum = track;
return chdlba;
}
return physlba;
}
/*-------------------------------------------------
logical_to_chd_lba - find the CHD LBA
and the track number
-------------------------------------------------*/
/**
* @fn static inline uint32_t logical_to_chd_lba(cdrom_file *file, uint32_t loglba, uint32_t &tracknum)
*
* @brief Logical to chd lba.
*
* @param [in,out] file If non-null, the file.
* @param loglba The loglba.
* @param [in,out] tracknum The tracknum.
*
* @return An uint32_t.
*/
static inline uint32_t logical_to_chd_lba(cdrom_file *file, uint32_t loglba, uint32_t &tracknum)
{
uint32_t chdlba, physlba;
int track;
/* loop until our current LBA is less than the start LBA of the next track */
for (track = 0; track < file->cdtoc.numtrks; track++)
{
if (loglba < file->cdtoc.tracks[track + 1].logframeofs)
{
// is this a no-pregap-data track? compensate for the logical offset pointing to the "wrong" sector.
if ((file->cdtoc.tracks[track].pgdatasize == 0) && (loglba > file->cdtoc.tracks[track].pregap))
{
loglba -= file->cdtoc.tracks[track].pregap;
}
// convert to physical and proceed
physlba = file->cdtoc.tracks[track].physframeofs + (loglba - file->cdtoc.tracks[track].logframeofs);
chdlba = physlba - file->cdtoc.tracks[track].physframeofs + file->cdtoc.tracks[track].chdframeofs;
tracknum = track;
return chdlba;
}
}
return loglba;
}
/***************************************************************************
BASE FUNCTIONALITY
***************************************************************************/
/**
* @fn cdrom_file *cdrom_open(const char *inputfile)
*
* @brief Queries if a given cdrom open.
*
* @param inputfile The inputfile.
*
* @return null if it fails, else a cdrom_file*.
*/
cdrom_file *cdrom_open(const char *inputfile)
{
int i;
cdrom_file *file;
uint32_t physofs, logofs;
/* allocate memory for the CD-ROM file */
file = new (std::nothrow) cdrom_file();
if (file == nullptr)
return nullptr;
/* setup the CDROM module and get the disc info */
chd_error err = chdcd_parse_toc(inputfile, file->cdtoc, file->track_info);
if (err != CHDERR_NONE)
{
fprintf(stderr, "Error reading input file: %s\n", chd_file::error_string(err));
delete file;
return nullptr;
}
/* fill in the data */
file->chd = nullptr;
LOG(("CD has %d tracks\n", file->cdtoc.numtrks));
for (i = 0; i < file->cdtoc.numtrks; i++)
{
osd_file::error filerr = util::core_file::open(file->track_info.track[i].fname, OPEN_FLAG_READ, file->fhandle[i]);
if (filerr != osd_file::error::NONE)
{
fprintf(stderr, "Unable to open file: %s\n", file->track_info.track[i].fname.c_str());
cdrom_close(file);
return nullptr;
}
}
/* calculate the starting frame for each track, keeping in mind that CHDMAN
pads tracks out with extra frames to fit 4-frame size boundries
*/
physofs = logofs = 0;
for (i = 0; i < file->cdtoc.numtrks; i++)
{
file->cdtoc.tracks[i].physframeofs = physofs;
file->cdtoc.tracks[i].chdframeofs = 0;
file->cdtoc.tracks[i].logframeofs = logofs;
// if the pregap sectors aren't in the track, add them to the track's logical length
if (file->cdtoc.tracks[i].pgdatasize == 0)
{
logofs += file->cdtoc.tracks[i].pregap;
}
// postgap adds to the track length
logofs += file->cdtoc.tracks[i].postgap;
physofs += file->cdtoc.tracks[i].frames;
logofs += file->cdtoc.tracks[i].frames;
/* printf("Track %02d is format %d subtype %d datasize %d subsize %d frames %d extraframes %d pregap %d pgmode %d presize %d postgap %d logofs %d physofs %d chdofs %d\n", i+1,
file->cdtoc.tracks[i].trktype,
file->cdtoc.tracks[i].subtype,
file->cdtoc.tracks[i].datasize,
file->cdtoc.tracks[i].subsize,
file->cdtoc.tracks[i].frames,
file->cdtoc.tracks[i].extraframes,
file->cdtoc.tracks[i].pregap,
file->cdtoc.tracks[i].pgtype,
file->cdtoc.tracks[i].pgdatasize,
file->cdtoc.tracks[i].postgap,
file->cdtoc.tracks[i].logframeofs,
file->cdtoc.tracks[i].physframeofs,
file->cdtoc.tracks[i].chdframeofs);*/
}
/* fill out dummy entries for the last track to help our search */
file->cdtoc.tracks[i].physframeofs = physofs;
file->cdtoc.tracks[i].logframeofs = logofs;
file->cdtoc.tracks[i].chdframeofs = 0;
return file;
}
/*-------------------------------------------------
cdrom_open - "open" a CD-ROM file from an
already-opened CHD file
-------------------------------------------------*/
/**
* @fn cdrom_file *cdrom_open(chd_file *chd)
*
* @brief Queries if a given cdrom open.
*
* @param [in,out] chd If non-null, the chd.
*
* @return null if it fails, else a cdrom_file*.
*/
cdrom_file *cdrom_open(chd_file *chd)
{
int i;
cdrom_file *file;
uint32_t physofs, chdofs, logofs;
chd_error err;
/* punt if no CHD */
if (!chd)
return nullptr;
/* validate the CHD information */
if (chd->hunk_bytes() % CD_FRAME_SIZE != 0)
return nullptr;
if (chd->unit_bytes() != CD_FRAME_SIZE)
return nullptr;
/* allocate memory for the CD-ROM file */
file = new (std::nothrow) cdrom_file();
if (file == nullptr)
return nullptr;
/* fill in the data */
file->chd = chd;
/* read the CD-ROM metadata */
err = cdrom_parse_metadata(chd, &file->cdtoc);
if (err != CHDERR_NONE)
{
delete file;
return nullptr;
}
LOG(("CD has %d tracks\n", file->cdtoc.numtrks));
/* calculate the starting frame for each track, keeping in mind that CHDMAN
pads tracks out with extra frames to fit 4-frame size boundries
*/
physofs = chdofs = logofs = 0;
for (i = 0; i < file->cdtoc.numtrks; i++)
{
file->cdtoc.tracks[i].physframeofs = physofs;
file->cdtoc.tracks[i].chdframeofs = chdofs;
file->cdtoc.tracks[i].logframeofs = logofs;
// if the pregap sectors aren't in the track, add them to the track's logical length
if (file->cdtoc.tracks[i].pgdatasize == 0)
{
logofs += file->cdtoc.tracks[i].pregap;
}
// postgap counts against the next track
logofs += file->cdtoc.tracks[i].postgap;
physofs += file->cdtoc.tracks[i].frames;
chdofs += file->cdtoc.tracks[i].frames;
chdofs += file->cdtoc.tracks[i].extraframes;
logofs += file->cdtoc.tracks[i].frames;
/*
printf("Track %02d is format %d subtype %d datasize %d subsize %d frames %d extraframes %d pregap %d pgmode %d presize %d postgap %d logofs %d physofs %d chdofs %d\n", i+1,
file->cdtoc.tracks[i].trktype,
file->cdtoc.tracks[i].subtype,
file->cdtoc.tracks[i].datasize,
file->cdtoc.tracks[i].subsize,
file->cdtoc.tracks[i].frames,
file->cdtoc.tracks[i].extraframes,
file->cdtoc.tracks[i].pregap,
file->cdtoc.tracks[i].pgtype,
file->cdtoc.tracks[i].pgdatasize,
file->cdtoc.tracks[i].postgap,
file->cdtoc.tracks[i].logframeofs,
file->cdtoc.tracks[i].physframeofs,
file->cdtoc.tracks[i].chdframeofs);*/
}
/* fill out dummy entries for the last track to help our search */
file->cdtoc.tracks[i].physframeofs = physofs;
file->cdtoc.tracks[i].logframeofs = logofs;
file->cdtoc.tracks[i].chdframeofs = chdofs;
return file;
}
/*-------------------------------------------------
cdrom_close - "close" a CD-ROM file
-------------------------------------------------*/
/**
* @fn void cdrom_close(cdrom_file *file)
*
* @brief Cdrom close.
*
* @param [in,out] file If non-null, the file.
*/
void cdrom_close(cdrom_file *file)
{
if (file == nullptr)
return;
if (file->chd == nullptr)
{
for (int i = 0; i < file->cdtoc.numtrks; i++)
{
file->fhandle[i].reset();
}
}
delete file;
}
/***************************************************************************
CORE READ ACCESS
***************************************************************************/
/**
* @fn chd_error read_partial_sector(cdrom_file *file, void *dest, uint32_t lbasector, uint32_t chdsector, uint32_t tracknum, uint32_t startoffs, uint32_t length)
*
* @brief Reads partial sector.
*
* @param [in,out] file If non-null, the file.
* @param [in,out] dest If non-null, destination for the.
* @param lbasector The lbasector.
* @param chdsector The chdsector.
* @param tracknum The tracknum.
* @param startoffs The startoffs.
* @param length The length.
*
* @return The partial sector.
*/
chd_error read_partial_sector(cdrom_file *file, void *dest, uint32_t lbasector, uint32_t chdsector, uint32_t tracknum, uint32_t startoffs, uint32_t length, bool phys=false)
{
chd_error result = CHDERR_NONE;
bool needswap = false;
// if this is pregap info that isn't actually in the file, just return blank data
if (!phys)
{
if ((file->cdtoc.tracks[tracknum].pgdatasize == 0) && (lbasector < (file->cdtoc.tracks[tracknum].logframeofs + file->cdtoc.tracks[tracknum].pregap)))
{
//printf("PG missing sector: LBA %d, trklog %d\n", lbasector, file->cdtoc.tracks[tracknum].logframeofs);
memset(dest, 0, length);
return result;
}
}
// if a CHD, just read
if (file->chd != nullptr)
{
result = file->chd->read_bytes(uint64_t(chdsector) * uint64_t(CD_FRAME_SIZE) + startoffs, dest, length);
/* swap CDDA in the case of LE GDROMs */
if ((file->cdtoc.flags & CD_FLAG_GDROMLE) && (file->cdtoc.tracks[tracknum].trktype == CD_TRACK_AUDIO))
needswap = true;
}
else
{
// else read from the appropriate file
util::core_file &srcfile = *file->fhandle[tracknum];
uint64_t sourcefileoffset = file->track_info.track[tracknum].offset;
int bytespersector = file->cdtoc.tracks[tracknum].datasize + file->cdtoc.tracks[tracknum].subsize;
sourcefileoffset += chdsector * bytespersector + startoffs;
// printf("Reading sector %d from track %d at offset %lld\n", chdsector, tracknum, sourcefileoffset);
srcfile.seek(sourcefileoffset, SEEK_SET);
srcfile.read(dest, length);
needswap = file->track_info.track[tracknum].swap;
}
if (needswap)
{
uint8_t *buffer = (uint8_t *)dest - startoffs;
for (int swapindex = startoffs; swapindex < 2352; swapindex += 2 )
{
int swaptemp = buffer[ swapindex ];
buffer[ swapindex ] = buffer[ swapindex + 1 ];
buffer[ swapindex + 1 ] = swaptemp;
}
}
return result;
}
/*-------------------------------------------------
cdrom_read_data - read one or more sectors
from a CD-ROM
-------------------------------------------------*/
/**
* @fn uint32_t cdrom_read_data(cdrom_file *file, uint32_t lbasector, void *buffer, uint32_t datatype, bool phys)
*
* @brief Cdrom read data.
*
* @param [in,out] file If non-null, the file.
* @param lbasector The lbasector.
* @param [in,out] buffer If non-null, the buffer.
* @param datatype The datatype.
* @param phys true to physical.
*
* @return An uint32_t.
*/
uint32_t cdrom_read_data(cdrom_file *file, uint32_t lbasector, void *buffer, uint32_t datatype, bool phys)
{
if (file == nullptr)
return 0;
// compute CHD sector and tracknumber
uint32_t tracknum = 0;
uint32_t chdsector;
if (phys)
{
chdsector = physical_to_chd_lba(file, lbasector, tracknum);
}
else
{
chdsector = logical_to_chd_lba(file, lbasector, tracknum);
}
/* copy out the requested sector */
uint32_t tracktype = file->cdtoc.tracks[tracknum].trktype;
if ((datatype == tracktype) || (datatype == CD_TRACK_RAW_DONTCARE))
{
return (read_partial_sector(file, buffer, lbasector, chdsector, tracknum, 0, file->cdtoc.tracks[tracknum].datasize, phys) == CHDERR_NONE);
}
else
{
/* return 2048 bytes of mode 1 data from a 2352 byte mode 1 raw sector */
if ((datatype == CD_TRACK_MODE1) && (tracktype == CD_TRACK_MODE1_RAW))
{
return (read_partial_sector(file, buffer, lbasector, chdsector, tracknum, 16, 2048, phys) == CHDERR_NONE);
}
/* return 2352 byte mode 1 raw sector from 2048 bytes of mode 1 data */
if ((datatype == CD_TRACK_MODE1_RAW) && (tracktype == CD_TRACK_MODE1))
{
uint8_t *bufptr = (uint8_t *)buffer;
uint32_t msf = lba_to_msf(lbasector);
static const uint8_t syncbytes[12] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00};
memcpy(bufptr, syncbytes, 12);
bufptr[12] = msf>>16;
bufptr[13] = msf>>8;
bufptr[14] = msf&0xff;
bufptr[15] = 1; // mode 1
LOG(("CDROM: promotion of mode1/form1 sector to mode1 raw is not complete!\n"));
return (read_partial_sector(file, bufptr+16, lbasector, chdsector, tracknum, 0, 2048, phys) == CHDERR_NONE);
}
/* return 2048 bytes of mode 1 data from a mode2 form1 or raw sector */
if ((datatype == CD_TRACK_MODE1) && ((tracktype == CD_TRACK_MODE2_FORM1)||(tracktype == CD_TRACK_MODE2_RAW)))
{
return (read_partial_sector(file, buffer, lbasector, chdsector, tracknum, 24, 2048, phys) == CHDERR_NONE);
}
/* return 2048 bytes of mode 1 data from a mode2 form2 or XA sector */
if ((datatype == CD_TRACK_MODE1) && (tracktype == CD_TRACK_MODE2_FORM_MIX))
{
return (read_partial_sector(file, buffer, lbasector, chdsector, tracknum, 8, 2048, phys) == CHDERR_NONE);
}
/* return mode 2 2336 byte data from a 2352 byte mode 1 or 2 raw sector (skip the header) */
if ((datatype == CD_TRACK_MODE2) && ((tracktype == CD_TRACK_MODE1_RAW) || (tracktype == CD_TRACK_MODE2_RAW)))
{
return (read_partial_sector(file, buffer, lbasector, chdsector, tracknum, 16, 2336, phys) == CHDERR_NONE);
}
LOG(("CDROM: Conversion from type %d to type %d not supported!\n", tracktype, datatype));
return 0;
}
}
/*-------------------------------------------------
cdrom_read_subcode - read subcode data for
a sector
-------------------------------------------------*/
/**
* @fn uint32_t cdrom_read_subcode(cdrom_file *file, uint32_t lbasector, void *buffer, bool phys)
*
* @brief Cdrom read subcode.
*
* @param [in,out] file If non-null, the file.
* @param lbasector The lbasector.
* @param [in,out] buffer If non-null, the buffer.
* @param phys true to physical.
*
* @return An uint32_t.
*/
uint32_t cdrom_read_subcode(cdrom_file *file, uint32_t lbasector, void *buffer, bool phys)
{
if (file == nullptr)
return ~0;
// compute CHD sector and tracknumber
uint32_t tracknum = 0;
uint32_t chdsector;
if (phys)
{
chdsector = physical_to_chd_lba(file, lbasector, tracknum);
}
else
{
chdsector = logical_to_chd_lba(file, lbasector, tracknum);
}
if (file->cdtoc.tracks[tracknum].subsize == 0)
return 0;
// read the data
chd_error err = read_partial_sector(file, buffer, lbasector, chdsector, tracknum, file->cdtoc.tracks[tracknum].datasize, file->cdtoc.tracks[tracknum].subsize);
return (err == CHDERR_NONE);
}
/***************************************************************************
HANDY UTILITIES
***************************************************************************/
/*-------------------------------------------------
cdrom_get_track - get the track number
for a physical frame number
-------------------------------------------------*/
/**
* @fn uint32_t cdrom_get_track(cdrom_file *file, uint32_t frame)
*
* @brief Cdrom get track.
*
* @param [in,out] file If non-null, the file.
* @param frame The frame.
*
* @return An uint32_t.
*/
uint32_t cdrom_get_track(cdrom_file *file, uint32_t frame)
{
uint32_t track = 0;
if (file == nullptr)
return ~0;
/* convert to a CHD sector offset and get track information */
logical_to_chd_lba(file, frame, track);
return track;
}
/*-------------------------------------------------
cdrom_get_track_start - get the frame number
that a track starts at
-------------------------------------------------*/
/**
* @fn uint32_t cdrom_get_track_start(cdrom_file *file, uint32_t track)
*
* @brief Cdrom get track start.
*
* @param [in,out] file If non-null, the file.
* @param track The track.
*
* @return An uint32_t.
*/
uint32_t cdrom_get_track_start(cdrom_file *file, uint32_t track)
{
if (file == nullptr)
return ~0;
/* handle lead-out specially */
if (track == 0xaa)
track = file->cdtoc.numtrks;
return file->cdtoc.tracks[track].logframeofs;
}
/*-------------------------------------------------
cdrom_get_track_start_phys - get the
physical frame number that a track starts at
-------------------------------------------------*/
/**
* @fn uint32_t cdrom_get_track_start_phys(cdrom_file *file, uint32_t track)
*
* @brief Cdrom get track start physical.
*
* @param [in,out] file If non-null, the file.
* @param track The track.
*
* @return An uint32_t.
*/
uint32_t cdrom_get_track_start_phys(cdrom_file *file, uint32_t track)
{
if (file == nullptr)
return ~0;
/* handle lead-out specially */
if (track == 0xaa)
track = file->cdtoc.numtrks;
return file->cdtoc.tracks[track].physframeofs;
}
/*-------------------------------------------------
cdrom_get_chd - get a handle to a CHD
from a cdrom
-------------------------------------------------*/
chd_file *cdrom_get_chd(cdrom_file *file)
{
return file->chd;
}
/***************************************************************************
TOC UTILITIES
***************************************************************************/
/*-------------------------------------------------
cdrom_get_last_track - returns the last track
number
-------------------------------------------------*/
/**
* @fn int cdrom_get_last_track(cdrom_file *file)
*
* @brief Cdrom get last track.
*
* @param [in,out] file If non-null, the file.
*
* @return An int.
*/
int cdrom_get_last_track(cdrom_file *file)
{
if (file == nullptr)
return -1;
return file->cdtoc.numtrks;
}
/*-------------------------------------------------
cdrom_get_adr_control - get the ADR | CONTROL
for a track
-------------------------------------------------*/
/**
* @fn int cdrom_get_adr_control(cdrom_file *file, int track)
*
* @brief Cdrom get address control.
*
* @param [in,out] file If non-null, the file.
* @param track The track.
*
* @return An int.
*/
int cdrom_get_adr_control(cdrom_file *file, int track)
{
if (file == nullptr)
return -1;
if (track == 0xaa || file->cdtoc.tracks[track].trktype == CD_TRACK_AUDIO)
{
return 0x10; // audio track, subchannel is position
}
return 0x14; // data track, subchannel is position
}
/*-------------------------------------------------
cdrom_get_track_type - return the track type
-------------------------------------------------*/
/**
* @fn int cdrom_get_track_type(cdrom_file *file, int track)
*
* @brief Cdrom get track type.
*
* @param [in,out] file If non-null, the file.
* @param track The track.
*
* @return An int.
*/
int cdrom_get_track_type(cdrom_file *file, int track)
{
if (file == nullptr)
return -1;
return file->cdtoc.tracks[track].trktype;
}
/*-------------------------------------------------
cdrom_get_toc - return the TOC data for a
CD-ROM
-------------------------------------------------*/
/**
* @fn const cdrom_toc *cdrom_get_toc(cdrom_file *file)
*
* @brief Cdrom get TOC.
*
* @param [in,out] file If non-null, the file.
*
* @return null if it fails, else a cdrom_toc*.
*/
const cdrom_toc *cdrom_get_toc(cdrom_file *file)
{
if (file == nullptr)
return nullptr;
return &file->cdtoc;
}
/***************************************************************************
EXTRA UTILITIES
***************************************************************************/
/*-------------------------------------------------
cdrom_get_info_from_type_string
take a string and convert it into track type
and track data size
-------------------------------------------------*/
/**
* @fn static void cdrom_get_info_from_type_string(const char *typestring, uint32_t *trktype, uint32_t *datasize)
*
* @brief Cdrom get information from type string.
*
* @param typestring The typestring.
* @param [in,out] trktype If non-null, the trktype.
* @param [in,out] datasize If non-null, the datasize.
*/
static void cdrom_get_info_from_type_string(const char *typestring, uint32_t *trktype, uint32_t *datasize)
{
if (!strcmp(typestring, "MODE1"))
{
*trktype = CD_TRACK_MODE1;
*datasize = 2048;
}
else if (!strcmp(typestring, "MODE1/2048"))
{
*trktype = CD_TRACK_MODE1;
*datasize = 2048;
}
else if (!strcmp(typestring, "MODE1_RAW"))
{
*trktype = CD_TRACK_MODE1_RAW;
*datasize = 2352;
}
else if (!strcmp(typestring, "MODE1/2352"))
{
*trktype = CD_TRACK_MODE1_RAW;
*datasize = 2352;
}
else if (!strcmp(typestring, "MODE2"))
{
*trktype = CD_TRACK_MODE2;
*datasize = 2336;
}
else if (!strcmp(typestring, "MODE2/2336"))
{
*trktype = CD_TRACK_MODE2;
*datasize = 2336;
}
else if (!strcmp(typestring, "MODE2_FORM1"))
{
*trktype = CD_TRACK_MODE2_FORM1;
*datasize = 2048;
}
else if (!strcmp(typestring, "MODE2/2048"))
{
*trktype = CD_TRACK_MODE2_FORM1;
*datasize = 2048;
}
else if (!strcmp(typestring, "MODE2_FORM2"))
{
*trktype = CD_TRACK_MODE2_FORM2;
*datasize = 2324;
}
else if (!strcmp(typestring, "MODE2/2324"))
{
*trktype = CD_TRACK_MODE2_FORM2;
*datasize = 2324;
}
else if (!strcmp(typestring, "MODE2_FORM_MIX"))
{
*trktype = CD_TRACK_MODE2_FORM_MIX;
*datasize = 2336;
}
else if (!strcmp(typestring, "MODE2/2336"))
{
*trktype = CD_TRACK_MODE2_FORM_MIX;
*datasize = 2336;
}
else if (!strcmp(typestring, "MODE2_RAW"))
{
*trktype = CD_TRACK_MODE2_RAW;
*datasize = 2352;
}
else if (!strcmp(typestring, "MODE2/2352"))
{
*trktype = CD_TRACK_MODE2_RAW;
*datasize = 2352;
}
else if (!strcmp(typestring, "AUDIO"))
{
*trktype = CD_TRACK_AUDIO;
*datasize = 2352;
}
}
/*-------------------------------------------------
cdrom_convert_type_string_to_track_info -
take a string and convert it into track type
and track data size
-------------------------------------------------*/
/**
* @fn void cdrom_convert_type_string_to_track_info(const char *typestring, cdrom_track_info *info)
*
* @brief Cdrom convert type string to track information.
*
* @param typestring The typestring.
* @param [in,out] info If non-null, the information.
*/
void cdrom_convert_type_string_to_track_info(const char *typestring, cdrom_track_info *info)
{
cdrom_get_info_from_type_string(typestring, &info->trktype, &info->datasize);
}
/*-------------------------------------------------
cdrom_convert_type_string_to_pregap_info -
take a string and convert it into pregap type
and pregap data size
-------------------------------------------------*/
/**
* @fn void cdrom_convert_type_string_to_pregap_info(const char *typestring, cdrom_track_info *info)
*
* @brief Cdrom convert type string to pregap information.
*
* @param typestring The typestring.
* @param [in,out] info If non-null, the information.
*/
void cdrom_convert_type_string_to_pregap_info(const char *typestring, cdrom_track_info *info)
{
cdrom_get_info_from_type_string(typestring, &info->pgtype, &info->pgdatasize);
}
/*-------------------------------------------------
cdrom_convert_subtype_string_to_track_info -
take a string and convert it into track subtype
and track subcode data size
-------------------------------------------------*/
/**
* @fn void cdrom_convert_subtype_string_to_track_info(const char *typestring, cdrom_track_info *info)
*
* @brief Cdrom convert subtype string to track information.
*
* @param typestring The typestring.
* @param [in,out] info If non-null, the information.
*/
void cdrom_convert_subtype_string_to_track_info(const char *typestring, cdrom_track_info *info)
{
if (!strcmp(typestring, "RW"))
{
info->subtype = CD_SUB_NORMAL;
info->subsize = 96;
}
else if (!strcmp(typestring, "RW_RAW"))
{
info->subtype = CD_SUB_RAW;
info->subsize = 96;
}
}
/*-------------------------------------------------
cdrom_convert_subtype_string_to_pregap_info -
take a string and convert it into track subtype
and track subcode data size
-------------------------------------------------*/
/**
* @fn void cdrom_convert_subtype_string_to_pregap_info(const char *typestring, cdrom_track_info *info)
*
* @brief Cdrom convert subtype string to pregap information.
*
* @param typestring The typestring.
* @param [in,out] info If non-null, the information.
*/
void cdrom_convert_subtype_string_to_pregap_info(const char *typestring, cdrom_track_info *info)
{
if (!strcmp(typestring, "RW"))
{
info->pgsub = CD_SUB_NORMAL;
info->pgsubsize = 96;
}
else if (!strcmp(typestring, "RW_RAW"))
{
info->pgsub = CD_SUB_RAW;
info->pgsubsize = 96;
}
}
/*-------------------------------------------------
cdrom_get_type_string - get the string
associated with the given type
-------------------------------------------------*/
/**
* @fn const char *cdrom_get_type_string(uint32_t trktype)
*
* @brief Cdrom get type string.
*
* @param trktype The trktype.
*
* @return null if it fails, else a char*.
*/
const char *cdrom_get_type_string(uint32_t trktype)
{
switch (trktype)
{
case CD_TRACK_MODE1: return "MODE1";
case CD_TRACK_MODE1_RAW: return "MODE1_RAW";
case CD_TRACK_MODE2: return "MODE2";
case CD_TRACK_MODE2_FORM1: return "MODE2_FORM1";
case CD_TRACK_MODE2_FORM2: return "MODE2_FORM2";
case CD_TRACK_MODE2_FORM_MIX: return "MODE2_FORM_MIX";
case CD_TRACK_MODE2_RAW: return "MODE2_RAW";
case CD_TRACK_AUDIO: return "AUDIO";
default: return "UNKNOWN";
}
}
/*-------------------------------------------------
cdrom_get_subtype_string - get the string
associated with the given subcode type
-------------------------------------------------*/
/**
* @fn const char *cdrom_get_subtype_string(uint32_t subtype)
*
* @brief Cdrom get subtype string.
*
* @param subtype The subtype.
*
* @return null if it fails, else a char*.
*/
const char *cdrom_get_subtype_string(uint32_t subtype)
{
switch (subtype)
{
case CD_SUB_NORMAL: return "RW";
case CD_SUB_RAW: return "RW_RAW";
default: return "NONE";
}
}
/***************************************************************************
INTERNAL UTILITIES
***************************************************************************/
/*-------------------------------------------------
cdrom_parse_metadata - parse metadata into the
TOC structure
-------------------------------------------------*/
/**
* @fn chd_error cdrom_parse_metadata(chd_file *chd, cdrom_toc *toc)
*
* @brief Cdrom parse metadata.
*
* @param [in,out] chd If non-null, the chd.
* @param [in,out] toc If non-null, the TOC.
*
* @return A chd_error.
*/
chd_error cdrom_parse_metadata(chd_file *chd, cdrom_toc *toc)
{
std::string metadata;
chd_error err;
int i;
toc->flags = 0;
/* start with no tracks */
for (toc->numtrks = 0; toc->numtrks < CD_MAX_TRACKS; toc->numtrks++)
{
int tracknum = -1, frames = 0, pregap, postgap, padframes;
char type[16], subtype[16], pgtype[16], pgsub[16];
cdrom_track_info *track;
pregap = postgap = padframes = 0;
/* fetch the metadata for this track */
err = chd->read_metadata(CDROM_TRACK_METADATA_TAG, toc->numtrks, metadata);
if (err == CHDERR_NONE)
{
/* parse the metadata */
type[0] = subtype[0] = 0;
pgtype[0] = pgsub[0] = 0;
if (sscanf(metadata.c_str(), CDROM_TRACK_METADATA_FORMAT, &tracknum, type, subtype, &frames) != 4)
return CHDERR_INVALID_DATA;
if (tracknum == 0 || tracknum > CD_MAX_TRACKS)
return CHDERR_INVALID_DATA;
track = &toc->tracks[tracknum - 1];
}
else
{
err = chd->read_metadata(CDROM_TRACK_METADATA2_TAG, toc->numtrks, metadata);
if (err == CHDERR_NONE)
{
/* parse the metadata */
type[0] = subtype[0] = 0;
pregap = postgap = 0;
if (sscanf(metadata.c_str(), CDROM_TRACK_METADATA2_FORMAT, &tracknum, type, subtype, &frames, &pregap, pgtype, pgsub, &postgap) != 8)
return CHDERR_INVALID_DATA;
if (tracknum == 0 || tracknum > CD_MAX_TRACKS)
return CHDERR_INVALID_DATA;
track = &toc->tracks[tracknum - 1];
}
else
{
err = chd->read_metadata(GDROM_OLD_METADATA_TAG, toc->numtrks, metadata);
if (err == CHDERR_NONE)
/* legacy GDROM track was detected */
toc->flags |= CD_FLAG_GDROMLE;
else
err = chd->read_metadata(GDROM_TRACK_METADATA_TAG, toc->numtrks, metadata);
if (err == CHDERR_NONE)
{
/* parse the metadata */
type[0] = subtype[0] = 0;
pregap = postgap = 0;
if (sscanf(metadata.c_str(), GDROM_TRACK_METADATA_FORMAT, &tracknum, type, subtype, &frames, &padframes, &pregap, pgtype, pgsub, &postgap) != 9)
return CHDERR_INVALID_DATA;
if (tracknum == 0 || tracknum > CD_MAX_TRACKS)
return CHDERR_INVALID_DATA;
track = &toc->tracks[tracknum - 1];
toc->flags |= CD_FLAG_GDROM;
}
else
{
break;
}
}
}
/* extract the track type and determine the data size */
track->trktype = CD_TRACK_MODE1;
track->datasize = 0;
cdrom_convert_type_string_to_track_info(type, track);
if (track->datasize == 0)
return CHDERR_INVALID_DATA;
/* extract the subtype and determine the subcode data size */
track->subtype = CD_SUB_NONE;
track->subsize = 0;
cdrom_convert_subtype_string_to_track_info(subtype, track);
/* set the frames and extra frames data */
track->frames = frames;
track->padframes = padframes;
int padded = (frames + CD_TRACK_PADDING - 1) / CD_TRACK_PADDING;
track->extraframes = padded * CD_TRACK_PADDING - frames;
/* set the pregap info */
track->pregap = pregap;
track->pgtype = CD_TRACK_MODE1;
track->pgsub = CD_SUB_NONE;
track->pgdatasize = 0;
track->pgsubsize = 0;
if (track->pregap > 0)
{
if (pgtype[0] == 'V')
{
cdrom_convert_type_string_to_pregap_info(&pgtype[1], track);
}
cdrom_convert_subtype_string_to_pregap_info(pgsub, track);
}
/* set the postgap info */
track->postgap = postgap;
}
/* if we got any tracks this way, we're done */
if (toc->numtrks > 0)
return CHDERR_NONE;
printf("toc->numtrks = %u?!\n", toc->numtrks);
/* look for old-style metadata */
std::vector<uint8_t> oldmetadata;
err = chd->read_metadata(CDROM_OLD_METADATA_TAG, 0, oldmetadata);
if (err != CHDERR_NONE)
return err;
/* reconstruct the TOC from it */
uint32_t *mrp = reinterpret_cast<uint32_t *>(&oldmetadata[0]);
toc->numtrks = *mrp++;
for (i = 0; i < CD_MAX_TRACKS; i++)
{
toc->tracks[i].trktype = *mrp++;
toc->tracks[i].subtype = *mrp++;
toc->tracks[i].datasize = *mrp++;
toc->tracks[i].subsize = *mrp++;
toc->tracks[i].frames = *mrp++;
toc->tracks[i].extraframes = *mrp++;
toc->tracks[i].pregap = 0;
toc->tracks[i].postgap = 0;
toc->tracks[i].pgtype = 0;
toc->tracks[i].pgsub = 0;
toc->tracks[i].pgdatasize = 0;
toc->tracks[i].pgsubsize = 0;
}
/* TODO: I don't know why sometimes the data is one endian and sometimes another */
if (toc->numtrks > CD_MAX_TRACKS)
{
toc->numtrks = swapendian_int32(toc->numtrks);
for (i = 0; i < CD_MAX_TRACKS; i++)
{
toc->tracks[i].trktype = swapendian_int32(toc->tracks[i].trktype);
toc->tracks[i].subtype = swapendian_int32(toc->tracks[i].subtype);
toc->tracks[i].datasize = swapendian_int32(toc->tracks[i].datasize);
toc->tracks[i].subsize = swapendian_int32(toc->tracks[i].subsize);
toc->tracks[i].frames = swapendian_int32(toc->tracks[i].frames);
toc->tracks[i].padframes = swapendian_int32(toc->tracks[i].padframes);
toc->tracks[i].extraframes = swapendian_int32(toc->tracks[i].extraframes);
}
}
return CHDERR_NONE;
}
/*-------------------------------------------------
cdrom_write_metadata - write metadata
-------------------------------------------------*/
/**
* @fn chd_error cdrom_write_metadata(chd_file *chd, const cdrom_toc *toc)
*
* @brief Cdrom write metadata.
*
* @param [in,out] chd If non-null, the chd.
* @param toc The TOC.
*
* @return A chd_error.
*/
chd_error cdrom_write_metadata(chd_file *chd, const cdrom_toc *toc)
{
chd_error err;
/* write the metadata */
for (int i = 0; i < toc->numtrks; i++)
{
std::string metadata;
if (!(toc->flags & CD_FLAG_GDROM))
{
char submode[32];
if (toc->tracks[i].pgdatasize > 0)
{
strcpy(&submode[1], cdrom_get_type_string(toc->tracks[i].pgtype));
submode[0] = 'V'; // indicate valid submode
}
else
{
strcpy(submode, cdrom_get_type_string(toc->tracks[i].pgtype));
}
metadata = string_format(CDROM_TRACK_METADATA2_FORMAT, i + 1, cdrom_get_type_string(toc->tracks[i].trktype),
cdrom_get_subtype_string(toc->tracks[i].subtype), toc->tracks[i].frames, toc->tracks[i].pregap,
submode, cdrom_get_subtype_string(toc->tracks[i].pgsub),
toc->tracks[i].postgap);
err = chd->write_metadata(CDROM_TRACK_METADATA2_TAG, i, metadata);
}
else
{
metadata = string_format(GDROM_TRACK_METADATA_FORMAT, i + 1, cdrom_get_type_string(toc->tracks[i].trktype),
cdrom_get_subtype_string(toc->tracks[i].subtype), toc->tracks[i].frames, toc->tracks[i].padframes,
toc->tracks[i].pregap, cdrom_get_type_string(toc->tracks[i].pgtype),
cdrom_get_subtype_string(toc->tracks[i].pgsub), toc->tracks[i].postgap);
err = chd->write_metadata(GDROM_TRACK_METADATA_TAG, i, metadata);
}
if (err != CHDERR_NONE)
return err;
}
return CHDERR_NONE;
}
/**
* @brief -------------------------------------------------
* ECC lookup tables pre-calculated tables for ECC data calcs
* -------------------------------------------------.
*/
static const uint8_t ecclow[256] =
{
0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e,
0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e,
0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e,
0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e,
0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e,
0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe,
0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde,
0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe,
0x1d, 0x1f, 0x19, 0x1b, 0x15, 0x17, 0x11, 0x13, 0x0d, 0x0f, 0x09, 0x0b, 0x05, 0x07, 0x01, 0x03,
0x3d, 0x3f, 0x39, 0x3b, 0x35, 0x37, 0x31, 0x33, 0x2d, 0x2f, 0x29, 0x2b, 0x25, 0x27, 0x21, 0x23,
0x5d, 0x5f, 0x59, 0x5b, 0x55, 0x57, 0x51, 0x53, 0x4d, 0x4f, 0x49, 0x4b, 0x45, 0x47, 0x41, 0x43,
0x7d, 0x7f, 0x79, 0x7b, 0x75, 0x77, 0x71, 0x73, 0x6d, 0x6f, 0x69, 0x6b, 0x65, 0x67, 0x61, 0x63,
0x9d, 0x9f, 0x99, 0x9b, 0x95, 0x97, 0x91, 0x93, 0x8d, 0x8f, 0x89, 0x8b, 0x85, 0x87, 0x81, 0x83,
0xbd, 0xbf, 0xb9, 0xbb, 0xb5, 0xb7, 0xb1, 0xb3, 0xad, 0xaf, 0xa9, 0xab, 0xa5, 0xa7, 0xa1, 0xa3,
0xdd, 0xdf, 0xd9, 0xdb, 0xd5, 0xd7, 0xd1, 0xd3, 0xcd, 0xcf, 0xc9, 0xcb, 0xc5, 0xc7, 0xc1, 0xc3,
0xfd, 0xff, 0xf9, 0xfb, 0xf5, 0xf7, 0xf1, 0xf3, 0xed, 0xef, 0xe9, 0xeb, 0xe5, 0xe7, 0xe1, 0xe3
};
/** @brief The ecchigh[ 256]. */
static const uint8_t ecchigh[256] =
{
0x00, 0xf4, 0xf5, 0x01, 0xf7, 0x03, 0x02, 0xf6, 0xf3, 0x07, 0x06, 0xf2, 0x04, 0xf0, 0xf1, 0x05,
0xfb, 0x0f, 0x0e, 0xfa, 0x0c, 0xf8, 0xf9, 0x0d, 0x08, 0xfc, 0xfd, 0x09, 0xff, 0x0b, 0x0a, 0xfe,
0xeb, 0x1f, 0x1e, 0xea, 0x1c, 0xe8, 0xe9, 0x1d, 0x18, 0xec, 0xed, 0x19, 0xef, 0x1b, 0x1a, 0xee,
0x10, 0xe4, 0xe5, 0x11, 0xe7, 0x13, 0x12, 0xe6, 0xe3, 0x17, 0x16, 0xe2, 0x14, 0xe0, 0xe1, 0x15,
0xcb, 0x3f, 0x3e, 0xca, 0x3c, 0xc8, 0xc9, 0x3d, 0x38, 0xcc, 0xcd, 0x39, 0xcf, 0x3b, 0x3a, 0xce,
0x30, 0xc4, 0xc5, 0x31, 0xc7, 0x33, 0x32, 0xc6, 0xc3, 0x37, 0x36, 0xc2, 0x34, 0xc0, 0xc1, 0x35,
0x20, 0xd4, 0xd5, 0x21, 0xd7, 0x23, 0x22, 0xd6, 0xd3, 0x27, 0x26, 0xd2, 0x24, 0xd0, 0xd1, 0x25,
0xdb, 0x2f, 0x2e, 0xda, 0x2c, 0xd8, 0xd9, 0x2d, 0x28, 0xdc, 0xdd, 0x29, 0xdf, 0x2b, 0x2a, 0xde,
0x8b, 0x7f, 0x7e, 0x8a, 0x7c, 0x88, 0x89, 0x7d, 0x78, 0x8c, 0x8d, 0x79, 0x8f, 0x7b, 0x7a, 0x8e,
0x70, 0x84, 0x85, 0x71, 0x87, 0x73, 0x72, 0x86, 0x83, 0x77, 0x76, 0x82, 0x74, 0x80, 0x81, 0x75,
0x60, 0x94, 0x95, 0x61, 0x97, 0x63, 0x62, 0x96, 0x93, 0x67, 0x66, 0x92, 0x64, 0x90, 0x91, 0x65,
0x9b, 0x6f, 0x6e, 0x9a, 0x6c, 0x98, 0x99, 0x6d, 0x68, 0x9c, 0x9d, 0x69, 0x9f, 0x6b, 0x6a, 0x9e,
0x40, 0xb4, 0xb5, 0x41, 0xb7, 0x43, 0x42, 0xb6, 0xb3, 0x47, 0x46, 0xb2, 0x44, 0xb0, 0xb1, 0x45,
0xbb, 0x4f, 0x4e, 0xba, 0x4c, 0xb8, 0xb9, 0x4d, 0x48, 0xbc, 0xbd, 0x49, 0xbf, 0x4b, 0x4a, 0xbe,
0xab, 0x5f, 0x5e, 0xaa, 0x5c, 0xa8, 0xa9, 0x5d, 0x58, 0xac, 0xad, 0x59, 0xaf, 0x5b, 0x5a, 0xae,
0x50, 0xa4, 0xa5, 0x51, 0xa7, 0x53, 0x52, 0xa6, 0xa3, 0x57, 0x56, 0xa2, 0x54, 0xa0, 0xa1, 0x55
};
/**
* @brief -------------------------------------------------
* poffsets - each row represents the addresses used to calculate a byte of the ECC P
* data 86 (*2) ECC P bytes, 24 values represented by each
* -------------------------------------------------.
*/
static const uint16_t poffsets[ECC_P_NUM_BYTES][ECC_P_COMP] =
{
{ 0x000,0x056,0x0ac,0x102,0x158,0x1ae,0x204,0x25a,0x2b0,0x306,0x35c,0x3b2,0x408,0x45e,0x4b4,0x50a,0x560,0x5b6,0x60c,0x662,0x6b8,0x70e,0x764,0x7ba },
{ 0x001,0x057,0x0ad,0x103,0x159,0x1af,0x205,0x25b,0x2b1,0x307,0x35d,0x3b3,0x409,0x45f,0x4b5,0x50b,0x561,0x5b7,0x60d,0x663,0x6b9,0x70f,0x765,0x7bb },
{ 0x002,0x058,0x0ae,0x104,0x15a,0x1b0,0x206,0x25c,0x2b2,0x308,0x35e,0x3b4,0x40a,0x460,0x4b6,0x50c,0x562,0x5b8,0x60e,0x664,0x6ba,0x710,0x766,0x7bc },
{ 0x003,0x059,0x0af,0x105,0x15b,0x1b1,0x207,0x25d,0x2b3,0x309,0x35f,0x3b5,0x40b,0x461,0x4b7,0x50d,0x563,0x5b9,0x60f,0x665,0x6bb,0x711,0x767,0x7bd },
{ 0x004,0x05a,0x0b0,0x106,0x15c,0x1b2,0x208,0x25e,0x2b4,0x30a,0x360,0x3b6,0x40c,0x462,0x4b8,0x50e,0x564,0x5ba,0x610,0x666,0x6bc,0x712,0x768,0x7be },
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{ 0x045,0x09b,0x0f1,0x147,0x19d,0x1f3,0x249,0x29f,0x2f5,0x34b,0x3a1,0x3f7,0x44d,0x4a3,0x4f9,0x54f,0x5a5,0x5fb,0x651,0x6a7,0x6fd,0x753,0x7a9,0x7ff },
{ 0x046,0x09c,0x0f2,0x148,0x19e,0x1f4,0x24a,0x2a0,0x2f6,0x34c,0x3a2,0x3f8,0x44e,0x4a4,0x4fa,0x550,0x5a6,0x5fc,0x652,0x6a8,0x6fe,0x754,0x7aa,0x800 },
{ 0x047,0x09d,0x0f3,0x149,0x19f,0x1f5,0x24b,0x2a1,0x2f7,0x34d,0x3a3,0x3f9,0x44f,0x4a5,0x4fb,0x551,0x5a7,0x5fd,0x653,0x6a9,0x6ff,0x755,0x7ab,0x801 },
{ 0x048,0x09e,0x0f4,0x14a,0x1a0,0x1f6,0x24c,0x2a2,0x2f8,0x34e,0x3a4,0x3fa,0x450,0x4a6,0x4fc,0x552,0x5a8,0x5fe,0x654,0x6aa,0x700,0x756,0x7ac,0x802 },
{ 0x049,0x09f,0x0f5,0x14b,0x1a1,0x1f7,0x24d,0x2a3,0x2f9,0x34f,0x3a5,0x3fb,0x451,0x4a7,0x4fd,0x553,0x5a9,0x5ff,0x655,0x6ab,0x701,0x757,0x7ad,0x803 },
{ 0x04a,0x0a0,0x0f6,0x14c,0x1a2,0x1f8,0x24e,0x2a4,0x2fa,0x350,0x3a6,0x3fc,0x452,0x4a8,0x4fe,0x554,0x5aa,0x600,0x656,0x6ac,0x702,0x758,0x7ae,0x804 },
{ 0x04b,0x0a1,0x0f7,0x14d,0x1a3,0x1f9,0x24f,0x2a5,0x2fb,0x351,0x3a7,0x3fd,0x453,0x4a9,0x4ff,0x555,0x5ab,0x601,0x657,0x6ad,0x703,0x759,0x7af,0x805 },
{ 0x04c,0x0a2,0x0f8,0x14e,0x1a4,0x1fa,0x250,0x2a6,0x2fc,0x352,0x3a8,0x3fe,0x454,0x4aa,0x500,0x556,0x5ac,0x602,0x658,0x6ae,0x704,0x75a,0x7b0,0x806 },
{ 0x04d,0x0a3,0x0f9,0x14f,0x1a5,0x1fb,0x251,0x2a7,0x2fd,0x353,0x3a9,0x3ff,0x455,0x4ab,0x501,0x557,0x5ad,0x603,0x659,0x6af,0x705,0x75b,0x7b1,0x807 },
{ 0x04e,0x0a4,0x0fa,0x150,0x1a6,0x1fc,0x252,0x2a8,0x2fe,0x354,0x3aa,0x400,0x456,0x4ac,0x502,0x558,0x5ae,0x604,0x65a,0x6b0,0x706,0x75c,0x7b2,0x808 },
{ 0x04f,0x0a5,0x0fb,0x151,0x1a7,0x1fd,0x253,0x2a9,0x2ff,0x355,0x3ab,0x401,0x457,0x4ad,0x503,0x559,0x5af,0x605,0x65b,0x6b1,0x707,0x75d,0x7b3,0x809 },
{ 0x050,0x0a6,0x0fc,0x152,0x1a8,0x1fe,0x254,0x2aa,0x300,0x356,0x3ac,0x402,0x458,0x4ae,0x504,0x55a,0x5b0,0x606,0x65c,0x6b2,0x708,0x75e,0x7b4,0x80a },
{ 0x051,0x0a7,0x0fd,0x153,0x1a9,0x1ff,0x255,0x2ab,0x301,0x357,0x3ad,0x403,0x459,0x4af,0x505,0x55b,0x5b1,0x607,0x65d,0x6b3,0x709,0x75f,0x7b5,0x80b },
{ 0x052,0x0a8,0x0fe,0x154,0x1aa,0x200,0x256,0x2ac,0x302,0x358,0x3ae,0x404,0x45a,0x4b0,0x506,0x55c,0x5b2,0x608,0x65e,0x6b4,0x70a,0x760,0x7b6,0x80c },
{ 0x053,0x0a9,0x0ff,0x155,0x1ab,0x201,0x257,0x2ad,0x303,0x359,0x3af,0x405,0x45b,0x4b1,0x507,0x55d,0x5b3,0x609,0x65f,0x6b5,0x70b,0x761,0x7b7,0x80d },
{ 0x054,0x0aa,0x100,0x156,0x1ac,0x202,0x258,0x2ae,0x304,0x35a,0x3b0,0x406,0x45c,0x4b2,0x508,0x55e,0x5b4,0x60a,0x660,0x6b6,0x70c,0x762,0x7b8,0x80e },
{ 0x055,0x0ab,0x101,0x157,0x1ad,0x203,0x259,0x2af,0x305,0x35b,0x3b1,0x407,0x45d,0x4b3,0x509,0x55f,0x5b5,0x60b,0x661,0x6b7,0x70d,0x763,0x7b9,0x80f }
};
/**
* @brief -------------------------------------------------
* qoffsets - each row represents the addresses used to calculate a byte of the ECC Q
* data 52 (*2) ECC Q bytes, 43 values represented by each
* -------------------------------------------------.
*/
static const uint16_t qoffsets[ECC_Q_NUM_BYTES][ECC_Q_COMP] =
{
{ 0x000,0x058,0x0b0,0x108,0x160,0x1b8,0x210,0x268,0x2c0,0x318,0x370,0x3c8,0x420,0x478,0x4d0,0x528,0x580,0x5d8,0x630,0x688,0x6e0,0x738,0x790,0x7e8,0x840,0x898,0x034,0x08c,0x0e4,0x13c,0x194,0x1ec,0x244,0x29c,0x2f4,0x34c,0x3a4,0x3fc,0x454,0x4ac,0x504,0x55c,0x5b4 },
{ 0x001,0x059,0x0b1,0x109,0x161,0x1b9,0x211,0x269,0x2c1,0x319,0x371,0x3c9,0x421,0x479,0x4d1,0x529,0x581,0x5d9,0x631,0x689,0x6e1,0x739,0x791,0x7e9,0x841,0x899,0x035,0x08d,0x0e5,0x13d,0x195,0x1ed,0x245,0x29d,0x2f5,0x34d,0x3a5,0x3fd,0x455,0x4ad,0x505,0x55d,0x5b5 },
{ 0x056,0x0ae,0x106,0x15e,0x1b6,0x20e,0x266,0x2be,0x316,0x36e,0x3c6,0x41e,0x476,0x4ce,0x526,0x57e,0x5d6,0x62e,0x686,0x6de,0x736,0x78e,0x7e6,0x83e,0x896,0x032,0x08a,0x0e2,0x13a,0x192,0x1ea,0x242,0x29a,0x2f2,0x34a,0x3a2,0x3fa,0x452,0x4aa,0x502,0x55a,0x5b2,0x60a },
{ 0x057,0x0af,0x107,0x15f,0x1b7,0x20f,0x267,0x2bf,0x317,0x36f,0x3c7,0x41f,0x477,0x4cf,0x527,0x57f,0x5d7,0x62f,0x687,0x6df,0x737,0x78f,0x7e7,0x83f,0x897,0x033,0x08b,0x0e3,0x13b,0x193,0x1eb,0x243,0x29b,0x2f3,0x34b,0x3a3,0x3fb,0x453,0x4ab,0x503,0x55b,0x5b3,0x60b },
{ 0x0ac,0x104,0x15c,0x1b4,0x20c,0x264,0x2bc,0x314,0x36c,0x3c4,0x41c,0x474,0x4cc,0x524,0x57c,0x5d4,0x62c,0x684,0x6dc,0x734,0x78c,0x7e4,0x83c,0x894,0x030,0x088,0x0e0,0x138,0x190,0x1e8,0x240,0x298,0x2f0,0x348,0x3a0,0x3f8,0x450,0x4a8,0x500,0x558,0x5b0,0x608,0x660 },
{ 0x0ad,0x105,0x15d,0x1b5,0x20d,0x265,0x2bd,0x315,0x36d,0x3c5,0x41d,0x475,0x4cd,0x525,0x57d,0x5d5,0x62d,0x685,0x6dd,0x735,0x78d,0x7e5,0x83d,0x895,0x031,0x089,0x0e1,0x139,0x191,0x1e9,0x241,0x299,0x2f1,0x349,0x3a1,0x3f9,0x451,0x4a9,0x501,0x559,0x5b1,0x609,0x661 },
{ 0x102,0x15a,0x1b2,0x20a,0x262,0x2ba,0x312,0x36a,0x3c2,0x41a,0x472,0x4ca,0x522,0x57a,0x5d2,0x62a,0x682,0x6da,0x732,0x78a,0x7e2,0x83a,0x892,0x02e,0x086,0x0de,0x136,0x18e,0x1e6,0x23e,0x296,0x2ee,0x346,0x39e,0x3f6,0x44e,0x4a6,0x4fe,0x556,0x5ae,0x606,0x65e,0x6b6 },
{ 0x103,0x15b,0x1b3,0x20b,0x263,0x2bb,0x313,0x36b,0x3c3,0x41b,0x473,0x4cb,0x523,0x57b,0x5d3,0x62b,0x683,0x6db,0x733,0x78b,0x7e3,0x83b,0x893,0x02f,0x087,0x0df,0x137,0x18f,0x1e7,0x23f,0x297,0x2ef,0x347,0x39f,0x3f7,0x44f,0x4a7,0x4ff,0x557,0x5af,0x607,0x65f,0x6b7 },
{ 0x158,0x1b0,0x208,0x260,0x2b8,0x310,0x368,0x3c0,0x418,0x470,0x4c8,0x520,0x578,0x5d0,0x628,0x680,0x6d8,0x730,0x788,0x7e0,0x838,0x890,0x02c,0x084,0x0dc,0x134,0x18c,0x1e4,0x23c,0x294,0x2ec,0x344,0x39c,0x3f4,0x44c,0x4a4,0x4fc,0x554,0x5ac,0x604,0x65c,0x6b4,0x70c },
{ 0x159,0x1b1,0x209,0x261,0x2b9,0x311,0x369,0x3c1,0x419,0x471,0x4c9,0x521,0x579,0x5d1,0x629,0x681,0x6d9,0x731,0x789,0x7e1,0x839,0x891,0x02d,0x085,0x0dd,0x135,0x18d,0x1e5,0x23d,0x295,0x2ed,0x345,0x39d,0x3f5,0x44d,0x4a5,0x4fd,0x555,0x5ad,0x605,0x65d,0x6b5,0x70d },
{ 0x1ae,0x206,0x25e,0x2b6,0x30e,0x366,0x3be,0x416,0x46e,0x4c6,0x51e,0x576,0x5ce,0x626,0x67e,0x6d6,0x72e,0x786,0x7de,0x836,0x88e,0x02a,0x082,0x0da,0x132,0x18a,0x1e2,0x23a,0x292,0x2ea,0x342,0x39a,0x3f2,0x44a,0x4a2,0x4fa,0x552,0x5aa,0x602,0x65a,0x6b2,0x70a,0x762 },
{ 0x1af,0x207,0x25f,0x2b7,0x30f,0x367,0x3bf,0x417,0x46f,0x4c7,0x51f,0x577,0x5cf,0x627,0x67f,0x6d7,0x72f,0x787,0x7df,0x837,0x88f,0x02b,0x083,0x0db,0x133,0x18b,0x1e3,0x23b,0x293,0x2eb,0x343,0x39b,0x3f3,0x44b,0x4a3,0x4fb,0x553,0x5ab,0x603,0x65b,0x6b3,0x70b,0x763 },
{ 0x204,0x25c,0x2b4,0x30c,0x364,0x3bc,0x414,0x46c,0x4c4,0x51c,0x574,0x5cc,0x624,0x67c,0x6d4,0x72c,0x784,0x7dc,0x834,0x88c,0x028,0x080,0x0d8,0x130,0x188,0x1e0,0x238,0x290,0x2e8,0x340,0x398,0x3f0,0x448,0x4a0,0x4f8,0x550,0x5a8,0x600,0x658,0x6b0,0x708,0x760,0x7b8 },
{ 0x205,0x25d,0x2b5,0x30d,0x365,0x3bd,0x415,0x46d,0x4c5,0x51d,0x575,0x5cd,0x625,0x67d,0x6d5,0x72d,0x785,0x7dd,0x835,0x88d,0x029,0x081,0x0d9,0x131,0x189,0x1e1,0x239,0x291,0x2e9,0x341,0x399,0x3f1,0x449,0x4a1,0x4f9,0x551,0x5a9,0x601,0x659,0x6b1,0x709,0x761,0x7b9 },
{ 0x25a,0x2b2,0x30a,0x362,0x3ba,0x412,0x46a,0x4c2,0x51a,0x572,0x5ca,0x622,0x67a,0x6d2,0x72a,0x782,0x7da,0x832,0x88a,0x026,0x07e,0x0d6,0x12e,0x186,0x1de,0x236,0x28e,0x2e6,0x33e,0x396,0x3ee,0x446,0x49e,0x4f6,0x54e,0x5a6,0x5fe,0x656,0x6ae,0x706,0x75e,0x7b6,0x80e },
{ 0x25b,0x2b3,0x30b,0x363,0x3bb,0x413,0x46b,0x4c3,0x51b,0x573,0x5cb,0x623,0x67b,0x6d3,0x72b,0x783,0x7db,0x833,0x88b,0x027,0x07f,0x0d7,0x12f,0x187,0x1df,0x237,0x28f,0x2e7,0x33f,0x397,0x3ef,0x447,0x49f,0x4f7,0x54f,0x5a7,0x5ff,0x657,0x6af,0x707,0x75f,0x7b7,0x80f },
{ 0x2b0,0x308,0x360,0x3b8,0x410,0x468,0x4c0,0x518,0x570,0x5c8,0x620,0x678,0x6d0,0x728,0x780,0x7d8,0x830,0x888,0x024,0x07c,0x0d4,0x12c,0x184,0x1dc,0x234,0x28c,0x2e4,0x33c,0x394,0x3ec,0x444,0x49c,0x4f4,0x54c,0x5a4,0x5fc,0x654,0x6ac,0x704,0x75c,0x7b4,0x80c,0x864 },
{ 0x2b1,0x309,0x361,0x3b9,0x411,0x469,0x4c1,0x519,0x571,0x5c9,0x621,0x679,0x6d1,0x729,0x781,0x7d9,0x831,0x889,0x025,0x07d,0x0d5,0x12d,0x185,0x1dd,0x235,0x28d,0x2e5,0x33d,0x395,0x3ed,0x445,0x49d,0x4f5,0x54d,0x5a5,0x5fd,0x655,0x6ad,0x705,0x75d,0x7b5,0x80d,0x865 },
{ 0x306,0x35e,0x3b6,0x40e,0x466,0x4be,0x516,0x56e,0x5c6,0x61e,0x676,0x6ce,0x726,0x77e,0x7d6,0x82e,0x886,0x022,0x07a,0x0d2,0x12a,0x182,0x1da,0x232,0x28a,0x2e2,0x33a,0x392,0x3ea,0x442,0x49a,0x4f2,0x54a,0x5a2,0x5fa,0x652,0x6aa,0x702,0x75a,0x7b2,0x80a,0x862,0x8ba },
{ 0x307,0x35f,0x3b7,0x40f,0x467,0x4bf,0x517,0x56f,0x5c7,0x61f,0x677,0x6cf,0x727,0x77f,0x7d7,0x82f,0x887,0x023,0x07b,0x0d3,0x12b,0x183,0x1db,0x233,0x28b,0x2e3,0x33b,0x393,0x3eb,0x443,0x49b,0x4f3,0x54b,0x5a3,0x5fb,0x653,0x6ab,0x703,0x75b,0x7b3,0x80b,0x863,0x8bb },
{ 0x35c,0x3b4,0x40c,0x464,0x4bc,0x514,0x56c,0x5c4,0x61c,0x674,0x6cc,0x724,0x77c,0x7d4,0x82c,0x884,0x020,0x078,0x0d0,0x128,0x180,0x1d8,0x230,0x288,0x2e0,0x338,0x390,0x3e8,0x440,0x498,0x4f0,0x548,0x5a0,0x5f8,0x650,0x6a8,0x700,0x758,0x7b0,0x808,0x860,0x8b8,0x054 },
{ 0x35d,0x3b5,0x40d,0x465,0x4bd,0x515,0x56d,0x5c5,0x61d,0x675,0x6cd,0x725,0x77d,0x7d5,0x82d,0x885,0x021,0x079,0x0d1,0x129,0x181,0x1d9,0x231,0x289,0x2e1,0x339,0x391,0x3e9,0x441,0x499,0x4f1,0x549,0x5a1,0x5f9,0x651,0x6a9,0x701,0x759,0x7b1,0x809,0x861,0x8b9,0x055 },
{ 0x3b2,0x40a,0x462,0x4ba,0x512,0x56a,0x5c2,0x61a,0x672,0x6ca,0x722,0x77a,0x7d2,0x82a,0x882,0x01e,0x076,0x0ce,0x126,0x17e,0x1d6,0x22e,0x286,0x2de,0x336,0x38e,0x3e6,0x43e,0x496,0x4ee,0x546,0x59e,0x5f6,0x64e,0x6a6,0x6fe,0x756,0x7ae,0x806,0x85e,0x8b6,0x052,0x0aa },
{ 0x3b3,0x40b,0x463,0x4bb,0x513,0x56b,0x5c3,0x61b,0x673,0x6cb,0x723,0x77b,0x7d3,0x82b,0x883,0x01f,0x077,0x0cf,0x127,0x17f,0x1d7,0x22f,0x287,0x2df,0x337,0x38f,0x3e7,0x43f,0x497,0x4ef,0x547,0x59f,0x5f7,0x64f,0x6a7,0x6ff,0x757,0x7af,0x807,0x85f,0x8b7,0x053,0x0ab },
{ 0x408,0x460,0x4b8,0x510,0x568,0x5c0,0x618,0x670,0x6c8,0x720,0x778,0x7d0,0x828,0x880,0x01c,0x074,0x0cc,0x124,0x17c,0x1d4,0x22c,0x284,0x2dc,0x334,0x38c,0x3e4,0x43c,0x494,0x4ec,0x544,0x59c,0x5f4,0x64c,0x6a4,0x6fc,0x754,0x7ac,0x804,0x85c,0x8b4,0x050,0x0a8,0x100 },
{ 0x409,0x461,0x4b9,0x511,0x569,0x5c1,0x619,0x671,0x6c9,0x721,0x779,0x7d1,0x829,0x881,0x01d,0x075,0x0cd,0x125,0x17d,0x1d5,0x22d,0x285,0x2dd,0x335,0x38d,0x3e5,0x43d,0x495,0x4ed,0x545,0x59d,0x5f5,0x64d,0x6a5,0x6fd,0x755,0x7ad,0x805,0x85d,0x8b5,0x051,0x0a9,0x101 },
{ 0x45e,0x4b6,0x50e,0x566,0x5be,0x616,0x66e,0x6c6,0x71e,0x776,0x7ce,0x826,0x87e,0x01a,0x072,0x0ca,0x122,0x17a,0x1d2,0x22a,0x282,0x2da,0x332,0x38a,0x3e2,0x43a,0x492,0x4ea,0x542,0x59a,0x5f2,0x64a,0x6a2,0x6fa,0x752,0x7aa,0x802,0x85a,0x8b2,0x04e,0x0a6,0x0fe,0x156 },
{ 0x45f,0x4b7,0x50f,0x567,0x5bf,0x617,0x66f,0x6c7,0x71f,0x777,0x7cf,0x827,0x87f,0x01b,0x073,0x0cb,0x123,0x17b,0x1d3,0x22b,0x283,0x2db,0x333,0x38b,0x3e3,0x43b,0x493,0x4eb,0x543,0x59b,0x5f3,0x64b,0x6a3,0x6fb,0x753,0x7ab,0x803,0x85b,0x8b3,0x04f,0x0a7,0x0ff,0x157 },
{ 0x4b4,0x50c,0x564,0x5bc,0x614,0x66c,0x6c4,0x71c,0x774,0x7cc,0x824,0x87c,0x018,0x070,0x0c8,0x120,0x178,0x1d0,0x228,0x280,0x2d8,0x330,0x388,0x3e0,0x438,0x490,0x4e8,0x540,0x598,0x5f0,0x648,0x6a0,0x6f8,0x750,0x7a8,0x800,0x858,0x8b0,0x04c,0x0a4,0x0fc,0x154,0x1ac },
{ 0x4b5,0x50d,0x565,0x5bd,0x615,0x66d,0x6c5,0x71d,0x775,0x7cd,0x825,0x87d,0x019,0x071,0x0c9,0x121,0x179,0x1d1,0x229,0x281,0x2d9,0x331,0x389,0x3e1,0x439,0x491,0x4e9,0x541,0x599,0x5f1,0x649,0x6a1,0x6f9,0x751,0x7a9,0x801,0x859,0x8b1,0x04d,0x0a5,0x0fd,0x155,0x1ad },
{ 0x50a,0x562,0x5ba,0x612,0x66a,0x6c2,0x71a,0x772,0x7ca,0x822,0x87a,0x016,0x06e,0x0c6,0x11e,0x176,0x1ce,0x226,0x27e,0x2d6,0x32e,0x386,0x3de,0x436,0x48e,0x4e6,0x53e,0x596,0x5ee,0x646,0x69e,0x6f6,0x74e,0x7a6,0x7fe,0x856,0x8ae,0x04a,0x0a2,0x0fa,0x152,0x1aa,0x202 },
{ 0x50b,0x563,0x5bb,0x613,0x66b,0x6c3,0x71b,0x773,0x7cb,0x823,0x87b,0x017,0x06f,0x0c7,0x11f,0x177,0x1cf,0x227,0x27f,0x2d7,0x32f,0x387,0x3df,0x437,0x48f,0x4e7,0x53f,0x597,0x5ef,0x647,0x69f,0x6f7,0x74f,0x7a7,0x7ff,0x857,0x8af,0x04b,0x0a3,0x0fb,0x153,0x1ab,0x203 },
{ 0x560,0x5b8,0x610,0x668,0x6c0,0x718,0x770,0x7c8,0x820,0x878,0x014,0x06c,0x0c4,0x11c,0x174,0x1cc,0x224,0x27c,0x2d4,0x32c,0x384,0x3dc,0x434,0x48c,0x4e4,0x53c,0x594,0x5ec,0x644,0x69c,0x6f4,0x74c,0x7a4,0x7fc,0x854,0x8ac,0x048,0x0a0,0x0f8,0x150,0x1a8,0x200,0x258 },
{ 0x561,0x5b9,0x611,0x669,0x6c1,0x719,0x771,0x7c9,0x821,0x879,0x015,0x06d,0x0c5,0x11d,0x175,0x1cd,0x225,0x27d,0x2d5,0x32d,0x385,0x3dd,0x435,0x48d,0x4e5,0x53d,0x595,0x5ed,0x645,0x69d,0x6f5,0x74d,0x7a5,0x7fd,0x855,0x8ad,0x049,0x0a1,0x0f9,0x151,0x1a9,0x201,0x259 },
{ 0x5b6,0x60e,0x666,0x6be,0x716,0x76e,0x7c6,0x81e,0x876,0x012,0x06a,0x0c2,0x11a,0x172,0x1ca,0x222,0x27a,0x2d2,0x32a,0x382,0x3da,0x432,0x48a,0x4e2,0x53a,0x592,0x5ea,0x642,0x69a,0x6f2,0x74a,0x7a2,0x7fa,0x852,0x8aa,0x046,0x09e,0x0f6,0x14e,0x1a6,0x1fe,0x256,0x2ae },
{ 0x5b7,0x60f,0x667,0x6bf,0x717,0x76f,0x7c7,0x81f,0x877,0x013,0x06b,0x0c3,0x11b,0x173,0x1cb,0x223,0x27b,0x2d3,0x32b,0x383,0x3db,0x433,0x48b,0x4e3,0x53b,0x593,0x5eb,0x643,0x69b,0x6f3,0x74b,0x7a3,0x7fb,0x853,0x8ab,0x047,0x09f,0x0f7,0x14f,0x1a7,0x1ff,0x257,0x2af },
{ 0x60c,0x664,0x6bc,0x714,0x76c,0x7c4,0x81c,0x874,0x010,0x068,0x0c0,0x118,0x170,0x1c8,0x220,0x278,0x2d0,0x328,0x380,0x3d8,0x430,0x488,0x4e0,0x538,0x590,0x5e8,0x640,0x698,0x6f0,0x748,0x7a0,0x7f8,0x850,0x8a8,0x044,0x09c,0x0f4,0x14c,0x1a4,0x1fc,0x254,0x2ac,0x304 },
{ 0x60d,0x665,0x6bd,0x715,0x76d,0x7c5,0x81d,0x875,0x011,0x069,0x0c1,0x119,0x171,0x1c9,0x221,0x279,0x2d1,0x329,0x381,0x3d9,0x431,0x489,0x4e1,0x539,0x591,0x5e9,0x641,0x699,0x6f1,0x749,0x7a1,0x7f9,0x851,0x8a9,0x045,0x09d,0x0f5,0x14d,0x1a5,0x1fd,0x255,0x2ad,0x305 },
{ 0x662,0x6ba,0x712,0x76a,0x7c2,0x81a,0x872,0x00e,0x066,0x0be,0x116,0x16e,0x1c6,0x21e,0x276,0x2ce,0x326,0x37e,0x3d6,0x42e,0x486,0x4de,0x536,0x58e,0x5e6,0x63e,0x696,0x6ee,0x746,0x79e,0x7f6,0x84e,0x8a6,0x042,0x09a,0x0f2,0x14a,0x1a2,0x1fa,0x252,0x2aa,0x302,0x35a },
{ 0x663,0x6bb,0x713,0x76b,0x7c3,0x81b,0x873,0x00f,0x067,0x0bf,0x117,0x16f,0x1c7,0x21f,0x277,0x2cf,0x327,0x37f,0x3d7,0x42f,0x487,0x4df,0x537,0x58f,0x5e7,0x63f,0x697,0x6ef,0x747,0x79f,0x7f7,0x84f,0x8a7,0x043,0x09b,0x0f3,0x14b,0x1a3,0x1fb,0x253,0x2ab,0x303,0x35b },
{ 0x6b8,0x710,0x768,0x7c0,0x818,0x870,0x00c,0x064,0x0bc,0x114,0x16c,0x1c4,0x21c,0x274,0x2cc,0x324,0x37c,0x3d4,0x42c,0x484,0x4dc,0x534,0x58c,0x5e4,0x63c,0x694,0x6ec,0x744,0x79c,0x7f4,0x84c,0x8a4,0x040,0x098,0x0f0,0x148,0x1a0,0x1f8,0x250,0x2a8,0x300,0x358,0x3b0 },
{ 0x6b9,0x711,0x769,0x7c1,0x819,0x871,0x00d,0x065,0x0bd,0x115,0x16d,0x1c5,0x21d,0x275,0x2cd,0x325,0x37d,0x3d5,0x42d,0x485,0x4dd,0x535,0x58d,0x5e5,0x63d,0x695,0x6ed,0x745,0x79d,0x7f5,0x84d,0x8a5,0x041,0x099,0x0f1,0x149,0x1a1,0x1f9,0x251,0x2a9,0x301,0x359,0x3b1 },
{ 0x70e,0x766,0x7be,0x816,0x86e,0x00a,0x062,0x0ba,0x112,0x16a,0x1c2,0x21a,0x272,0x2ca,0x322,0x37a,0x3d2,0x42a,0x482,0x4da,0x532,0x58a,0x5e2,0x63a,0x692,0x6ea,0x742,0x79a,0x7f2,0x84a,0x8a2,0x03e,0x096,0x0ee,0x146,0x19e,0x1f6,0x24e,0x2a6,0x2fe,0x356,0x3ae,0x406 },
{ 0x70f,0x767,0x7bf,0x817,0x86f,0x00b,0x063,0x0bb,0x113,0x16b,0x1c3,0x21b,0x273,0x2cb,0x323,0x37b,0x3d3,0x42b,0x483,0x4db,0x533,0x58b,0x5e3,0x63b,0x693,0x6eb,0x743,0x79b,0x7f3,0x84b,0x8a3,0x03f,0x097,0x0ef,0x147,0x19f,0x1f7,0x24f,0x2a7,0x2ff,0x357,0x3af,0x407 },
{ 0x764,0x7bc,0x814,0x86c,0x008,0x060,0x0b8,0x110,0x168,0x1c0,0x218,0x270,0x2c8,0x320,0x378,0x3d0,0x428,0x480,0x4d8,0x530,0x588,0x5e0,0x638,0x690,0x6e8,0x740,0x798,0x7f0,0x848,0x8a0,0x03c,0x094,0x0ec,0x144,0x19c,0x1f4,0x24c,0x2a4,0x2fc,0x354,0x3ac,0x404,0x45c },
{ 0x765,0x7bd,0x815,0x86d,0x009,0x061,0x0b9,0x111,0x169,0x1c1,0x219,0x271,0x2c9,0x321,0x379,0x3d1,0x429,0x481,0x4d9,0x531,0x589,0x5e1,0x639,0x691,0x6e9,0x741,0x799,0x7f1,0x849,0x8a1,0x03d,0x095,0x0ed,0x145,0x19d,0x1f5,0x24d,0x2a5,0x2fd,0x355,0x3ad,0x405,0x45d },
{ 0x7ba,0x812,0x86a,0x006,0x05e,0x0b6,0x10e,0x166,0x1be,0x216,0x26e,0x2c6,0x31e,0x376,0x3ce,0x426,0x47e,0x4d6,0x52e,0x586,0x5de,0x636,0x68e,0x6e6,0x73e,0x796,0x7ee,0x846,0x89e,0x03a,0x092,0x0ea,0x142,0x19a,0x1f2,0x24a,0x2a2,0x2fa,0x352,0x3aa,0x402,0x45a,0x4b2 },
{ 0x7bb,0x813,0x86b,0x007,0x05f,0x0b7,0x10f,0x167,0x1bf,0x217,0x26f,0x2c7,0x31f,0x377,0x3cf,0x427,0x47f,0x4d7,0x52f,0x587,0x5df,0x637,0x68f,0x6e7,0x73f,0x797,0x7ef,0x847,0x89f,0x03b,0x093,0x0eb,0x143,0x19b,0x1f3,0x24b,0x2a3,0x2fb,0x353,0x3ab,0x403,0x45b,0x4b3 },
{ 0x810,0x868,0x004,0x05c,0x0b4,0x10c,0x164,0x1bc,0x214,0x26c,0x2c4,0x31c,0x374,0x3cc,0x424,0x47c,0x4d4,0x52c,0x584,0x5dc,0x634,0x68c,0x6e4,0x73c,0x794,0x7ec,0x844,0x89c,0x038,0x090,0x0e8,0x140,0x198,0x1f0,0x248,0x2a0,0x2f8,0x350,0x3a8,0x400,0x458,0x4b0,0x508 },
{ 0x811,0x869,0x005,0x05d,0x0b5,0x10d,0x165,0x1bd,0x215,0x26d,0x2c5,0x31d,0x375,0x3cd,0x425,0x47d,0x4d5,0x52d,0x585,0x5dd,0x635,0x68d,0x6e5,0x73d,0x795,0x7ed,0x845,0x89d,0x039,0x091,0x0e9,0x141,0x199,0x1f1,0x249,0x2a1,0x2f9,0x351,0x3a9,0x401,0x459,0x4b1,0x509 },
{ 0x866,0x002,0x05a,0x0b2,0x10a,0x162,0x1ba,0x212,0x26a,0x2c2,0x31a,0x372,0x3ca,0x422,0x47a,0x4d2,0x52a,0x582,0x5da,0x632,0x68a,0x6e2,0x73a,0x792,0x7ea,0x842,0x89a,0x036,0x08e,0x0e6,0x13e,0x196,0x1ee,0x246,0x29e,0x2f6,0x34e,0x3a6,0x3fe,0x456,0x4ae,0x506,0x55e },
{ 0x867,0x003,0x05b,0x0b3,0x10b,0x163,0x1bb,0x213,0x26b,0x2c3,0x31b,0x373,0x3cb,0x423,0x47b,0x4d3,0x52b,0x583,0x5db,0x633,0x68b,0x6e3,0x73b,0x793,0x7eb,0x843,0x89b,0x037,0x08f,0x0e7,0x13f,0x197,0x1ef,0x247,0x29f,0x2f7,0x34f,0x3a7,0x3ff,0x457,0x4af,0x507,0x55f }
};
//-------------------------------------------------
// ecc_source_byte - return data from the sector
// at the given offset, masking anything
// particular to a mode
//-------------------------------------------------
inline uint8_t ecc_source_byte(const uint8_t *sector, uint32_t offset)
{
// in mode 2 always treat these as 0 bytes
return (sector[MODE_OFFSET] == 2 && offset < 4) ? 0x00 : sector[SYNC_OFFSET + SYNC_NUM_BYTES + offset];
}
/**
* @fn void ecc_compute_bytes(const uint8_t *sector, const uint16_t *row, int rowlen, uint8_t &val1, uint8_t &val2)
*
* @brief -------------------------------------------------
* ecc_compute_bytes - calculate an ECC value (P or Q)
* -------------------------------------------------.
*
* @param sector The sector.
* @param row The row.
* @param rowlen The rowlen.
* @param [in,out] val1 The first value.
* @param [in,out] val2 The second value.
*/
void ecc_compute_bytes(const uint8_t *sector, const uint16_t *row, int rowlen, uint8_t &val1, uint8_t &val2)
{
val1 = val2 = 0;
for (int component = 0; component < rowlen; component++)
{
val1 ^= ecc_source_byte(sector, row[component]);
val2 ^= ecc_source_byte(sector, row[component]);
val1 = ecclow[val1];
}
val1 = ecchigh[ecclow[val1] ^ val2];
val2 ^= val1;
}
/**
* @fn bool ecc_verify(const uint8_t *sector)
*
* @brief -------------------------------------------------
* ecc_verify - verify the P and Q ECC codes in a sector
* -------------------------------------------------.
*
* @param sector The sector.
*
* @return true if it succeeds, false if it fails.
*/
bool ecc_verify(const uint8_t *sector)
{
// first verify P bytes
for (int byte = 0; byte < ECC_P_NUM_BYTES; byte++)
{
uint8_t val1, val2;
ecc_compute_bytes(sector, poffsets[byte], ECC_P_COMP, val1, val2);
if (sector[ECC_P_OFFSET + byte] != val1 || sector[ECC_P_OFFSET + ECC_P_NUM_BYTES + byte] != val2)
return false;
}
// then verify Q bytes
for (int byte = 0; byte < ECC_Q_NUM_BYTES; byte++)
{
uint8_t val1, val2;
ecc_compute_bytes(sector, qoffsets[byte], ECC_Q_COMP, val1, val2);
if (sector[ECC_Q_OFFSET + byte] != val1 || sector[ECC_Q_OFFSET + ECC_Q_NUM_BYTES + byte] != val2)
return false;
}
return true;
}
/**
* @fn void ecc_generate(uint8_t *sector)
*
* @brief -------------------------------------------------
* ecc_generate - generate the P and Q ECC codes for a sector, overwriting any
* existing codes
* -------------------------------------------------.
*
* @param [in,out] sector If non-null, the sector.
*/
void ecc_generate(uint8_t *sector)
{
// first verify P bytes
for (int byte = 0; byte < ECC_P_NUM_BYTES; byte++)
ecc_compute_bytes(sector, poffsets[byte], ECC_P_COMP, sector[ECC_P_OFFSET + byte], sector[ECC_P_OFFSET + ECC_P_NUM_BYTES + byte]);
// then verify Q bytes
for (int byte = 0; byte < ECC_Q_NUM_BYTES; byte++)
ecc_compute_bytes(sector, qoffsets[byte], ECC_Q_COMP, sector[ECC_Q_OFFSET + byte], sector[ECC_Q_OFFSET + ECC_Q_NUM_BYTES + byte]);
}
/**
* @fn void ecc_clear(uint8_t *sector)
*
* @brief -------------------------------------------------
* ecc_clear - erase the ECC P and Q cods to 0 within a sector
* -------------------------------------------------.
*
* @param [in,out] sector If non-null, the sector.
*/
void ecc_clear(uint8_t *sector)
{
memset(&sector[ECC_P_OFFSET], 0, 2 * ECC_P_NUM_BYTES);
memset(&sector[ECC_Q_OFFSET], 0, 2 * ECC_Q_NUM_BYTES);
}
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