// license:BSD-3-Clause
// copyright-holders:R. Belmont
/***************************************************************************

	TOC parser for CHD compression frontend
	Handles CDRDAO .toc, CDRWIN .cue, Nero .nrg, and Sega GDROM .gdi

***************************************************************************/

#include "chdcd.h"

#include "chd.h"
#include "corefile.h"
#include "corestr.h"

#include "osdcore.h"

#include <cassert>
#include <cctype>
#include <cerrno>
#include <cstdlib>



/***************************************************************************
	CONSTANTS & DEFINES
***************************************************************************/

/**
 * @def TOKENIZE();
 *
 * @brief   A macro that defines tokenize.
 *
 * @param   linebuffer          The linebuffer.
 * @param   i                   Zero-based index of the.
 * @param   sizeof(linebuffer)  The sizeof(linebuffer)
 * @param   token               The token.
 * @param   sizeof(token)       The sizeof(token)
 */

#define TOKENIZE i = tokenize( linebuffer, i, sizeof(linebuffer), token, sizeof(token) );


enum gdi_area {
	SINGLE_DENSITY,
	HIGH_DENSITY
};

enum gdi_pattern {
	TYPE_UNKNOWN = 0,
	TYPE_I,
	TYPE_II,
	TYPE_III,
	TYPE_III_SPLIT
};


/***************************************************************************
	GLOBAL VARIABLES
***************************************************************************/

/** @brief  The linebuffer[ 512]. */
static char linebuffer[512];



/***************************************************************************
	IMPLEMENTATION
***************************************************************************/

/**
 * @fn  static std::string get_file_path(std::string &path)
 *
 * @brief   Gets file path.
 *
 * @param [in,out]  path    Full pathname of the file.
 *
 * @return  The file path.
 */

static std::string get_file_path(std::string& path)
{
	int pos = path.find_last_of('\\');
	if (pos != -1) {
		path = path.substr(0, pos + 1);
	}
	else {
		pos = path.find_last_of('/');
		path = path.substr(0, pos + 1);
	}
	return path;
}
/*-------------------------------------------------
	get_file_size - get the size of a file
-------------------------------------------------*/

/**
 * @fn  static uint64_t get_file_size(const char *filename)
 *
 * @brief   Gets file size.
 *
 * @param   filename    Filename of the file.
 *
 * @return  The file size.
 */

static uint64_t get_file_size(const char* filename)
{
	osd_file::ptr file;
	std::uint64_t filesize = 0;

	osd_file::open(filename, OPEN_FLAG_READ, file, filesize);

	return filesize;
}


/*-------------------------------------------------
	tokenize - get a token from the line buffer
-------------------------------------------------*/

/**
 * @fn  static int tokenize( const char *linebuffer, int i, int linebuffersize, char *token, int tokensize )
 *
 * @brief   Tokenizes.
 *
 * @param   linebuffer      The linebuffer.
 * @param   i               Zero-based index of the.
 * @param   linebuffersize  The linebuffersize.
 * @param [in,out]  token   If non-null, the token.
 * @param   tokensize       The tokensize.
 *
 * @return  An int.
 */

static int tokenize(const char* linebuffer, int i, int linebuffersize, char* token, int tokensize)
{
	int j = 0;
	int singlequote = 0;
	int doublequote = 0;

	while ((i < linebuffersize) && isspace((uint8_t)linebuffer[i]))
	{
		i++;
	}

	while ((i < linebuffersize) && (j < tokensize))
	{
		if (!singlequote && linebuffer[i] == '"')
		{
			doublequote = !doublequote;
		}
		else if (!doublequote && linebuffer[i] == '\'')
		{
			singlequote = !singlequote;
		}
		else if (!singlequote && !doublequote && isspace((uint8_t)linebuffer[i]))
		{
			break;
		}
		else
		{
			token[j] = linebuffer[i];
			j++;
		}

		i++;
	}

	token[j] = '\0';

	return i;
}


/*-------------------------------------------------
	msf_to_frames - convert m:s:f into a number of frames
-------------------------------------------------*/

/**
 * @fn  static int msf_to_frames( char *token )
 *
 * @brief   Msf to frames.
 *
 * @param [in,out]  token   If non-null, the token.
 *
 * @return  An int.
 */

static int msf_to_frames(char* token)
{
	int m = 0;
	int s = 0;
	int f = 0;

	if (sscanf(token, "%d:%d:%d", &m, &s, &f) == 1)
	{
		f = m;
	}
	else
	{
		/* convert to just frames */
		s += (m * 60);
		f += (s * 75);
	}

	return f;
}

/*-------------------------------------------------
	parse_wav_sample - takes a .WAV file, verifies
	that the file is 16 bits, and returns the
	length in bytes of the data and the offset in
	bytes to where the data starts in the file.
-------------------------------------------------*/

/**
 * @fn  static uint32_t parse_wav_sample(const char *filename, uint32_t *dataoffs)
 *
 * @brief   Parse WAV sample.
 *
 * @param   filename            Filename of the file.
 * @param [in,out]  dataoffs    If non-null, the dataoffs.
 *
 * @return  An uint32_t.
 */

static uint32_t parse_wav_sample(const char* filename, uint32_t* dataoffs)
{
	unsigned long offset = 0;
	uint32_t length, rate, filesize;
	uint16_t bits, temp16;
	char buf[32];
	osd_file::ptr file;
	uint64_t fsize = 0;
	std::uint32_t actual;

	std::error_condition const filerr = osd_file::open(filename, OPEN_FLAG_READ, file, fsize);
	if (filerr)
	{
		printf("ERROR: could not open (%s)\n", filename);
		return 0;
	}

	/* read the core header and make sure it's a WAVE file */
	file->read(buf, 0, 4, actual);
	offset += actual;
	if (offset < 4)
	{
		printf("ERROR: unexpected RIFF offset %lu (%s)\n", offset, filename);
		return 0;
	}
	if (memcmp(&buf[0], "RIFF", 4) != 0)
	{
		printf("ERROR: could not find RIFF header (%s)\n", filename);
		return 0;
	}

	/* get the total size */
	file->read(&filesize, offset, 4, actual);
	offset += actual;
	if (offset < 8)
	{
		printf("ERROR: unexpected size offset %lu (%s)\n", offset, filename);
		return 0;
	}
	filesize = little_endianize_int32(filesize);

	/* read the RIFF file type and make sure it's a WAVE file */
	file->read(buf, offset, 4, actual);
	offset += actual;
	if (offset < 12)
	{
		printf("ERROR: unexpected WAVE offset %lu (%s)\n", offset, filename);
		return 0;
	}
	if (memcmp(&buf[0], "WAVE", 4) != 0)
	{
		printf("ERROR: could not find WAVE header (%s)\n", filename);
		return 0;
	}

	/* seek until we find a format tag */
	while (true)
	{
		file->read(buf, offset, 4, actual);
		offset += actual;
		file->read(&length, offset, 4, actual);
		offset += actual;
		length = little_endianize_int32(length);
		if (memcmp(&buf[0], "fmt ", 4) == 0)
			break;

		/* seek to the next block */
		offset += length;
		if (offset >= filesize)
		{
			printf("ERROR: could not find fmt tag (%s)\n", filename);
			return 0;
		}
	}

	/* read the format -- make sure it is PCM */
	file->read(&temp16, offset, 2, actual);
	offset += actual;
	temp16 = little_endianize_int16(temp16);
	if (temp16 != 1)
	{
		printf("ERROR: unsupported format %u - only PCM is supported (%s)\n", temp16, filename);
		return 0;
	}

	/* number of channels -- only stereo is supported */
	file->read(&temp16, offset, 2, actual);
	offset += actual;
	temp16 = little_endianize_int16(temp16);
	if (temp16 != 2)
	{
		printf("ERROR: unsupported number of channels %u - only stereo is supported (%s)\n", temp16, filename);
		return 0;
	}

	/* sample rate */
	file->read(&rate, offset, 4, actual);
	offset += actual;
	rate = little_endianize_int32(rate);
	if (rate != 44100)
	{
		printf("ERROR: unsupported samplerate %u - only 44100 is supported (%s)\n", rate, filename);
		return 0;
	}

	/* bytes/second and block alignment are ignored */
	file->read(buf, offset, 6, actual);
	offset += actual;

	/* bits/sample */
	file->read(&bits, offset, 2, actual);
	offset += actual;
	bits = little_endianize_int16(bits);
	if (bits != 16)
	{
		printf("ERROR: unsupported bits/sample %u - only 16 is supported (%s)\n", bits, filename);
		return 0;
	}

	/* seek past any extra data */
	offset += length - 16;

	/* seek until we find a data tag */
	while (true)
	{
		file->read(buf, offset, 4, actual);
		offset += actual;
		file->read(&length, offset, 4, actual);
		offset += actual;
		length = little_endianize_int32(length);
		if (memcmp(&buf[0], "data", 4) == 0)
			break;

		/* seek to the next block */
		offset += length;
		if (offset >= filesize)
		{
			printf("ERROR: could not find data tag (%s)\n", filename);
			return 0;
		}
	}

	/* if there was a 0 length data block, we're done */
	if (length == 0)
	{
		printf("ERROR: empty data block (%s)\n", filename);
		return 0;
	}

	*dataoffs = offset;

	return length;
}

/**
 * @fn  uint16_t read_uint16(FILE *infile)
 *
 * @brief   Reads uint 16.
 *
 * @param [in,out]  infile  If non-null, the infile.
 *
 * @return  The uint 16.
 */

uint16_t read_uint16(FILE* infile)
{
	uint16_t res = 0;
	unsigned char buffer[2];

	fread(buffer, 2, 1, infile);

	res = buffer[1] | buffer[0] << 8;

	return res;
}

/**
 * @fn  uint32_t read_uint32(FILE *infile)
 *
 * @brief   Reads uint 32.
 *
 * @param [in,out]  infile  If non-null, the infile.
 *
 * @return  The uint 32.
 */

uint32_t read_uint32(FILE* infile)
{
	uint32_t res = 0;
	unsigned char buffer[4];

	fread(buffer, 4, 1, infile);

	res = buffer[3] | buffer[2] << 8 | buffer[1] << 16 | buffer[0] << 24;

	return res;
}

/**
 * @fn  uint64_t read_uint64(FILE *infile)
 *
 * @brief   Reads uint 64.
 *
 * @param [in,out]  infile  If non-null, the infile.
 *
 * @return  The uint 64.
 */

uint64_t read_uint64(FILE* infile)
{
	uint64_t res0(0), res1(0);
	uint64_t res;
	unsigned char buffer[8];

	fread(buffer, 8, 1, infile);

	res0 = buffer[3] | buffer[2] << 8 | buffer[1] << 16 | buffer[0] << 24;
	res1 = buffer[7] | buffer[6] << 8 | buffer[5] << 16 | buffer[4] << 24;

	res = res0 << 32 | res1;

	return res;
}

/*-------------------------------------------------
	chdcd_parse_nero - parse a Nero .NRG file
-------------------------------------------------*/

/**
 * @fn  std::error_condition chdcd_parse_nero(const char *tocfname, cdrom_toc &outtoc, chdcd_track_input_info &outinfo)
 *
 * @brief   Chdcd parse nero.
 *
 * @param   tocfname        The tocfname.
 * @param [in,out]  outtoc  The outtoc.
 * @param [in,out]  outinfo The outinfo.
 *
 * @return  A std::error_condition.
 */

std::error_condition chdcd_parse_nero(const char* tocfname, cdrom_toc& outtoc, chdcd_track_input_info& outinfo)
{
	unsigned char buffer[12];
	uint32_t chain_offs, chunk_size;
	int done = 0;

	std::string path = std::string(tocfname);

	FILE* infile = fopen(tocfname, "rb");
	if (!infile)
	{
		return std::error_condition(errno, std::generic_category());
	}

	path = get_file_path(path);

	/* clear structures */
	memset(&outtoc, 0, sizeof(outtoc));
	outinfo.reset();

	// seek to 12 bytes before the end
	fseek(infile, -12, SEEK_END);
	fread(buffer, 12, 1, infile);

	if (memcmp(buffer, "NER5", 4))
	{
		printf("ERROR: Not a Nero 5.5 or later image!\n");
		fclose(infile);
		return chd_file::error::UNSUPPORTED_FORMAT;
	}

	chain_offs = buffer[11] | (buffer[10] << 8) | (buffer[9] << 16) | (buffer[8] << 24);

	if ((buffer[7] != 0) || (buffer[6] != 0) || (buffer[5] != 0) || (buffer[4] != 0))
	{
		printf("ERROR: File size is > 4GB, this version of CHDMAN cannot handle it.");
		fclose(infile);
		return chd_file::error::UNSUPPORTED_FORMAT;
	}

	//  printf("NER5 detected, chain offset: %x\n", chain_offs);

	while (!done)
	{
		uint32_t offset;
		uint8_t start, end;
		int track;

		fseek(infile, chain_offs, SEEK_SET);
		fread(buffer, 8, 1, infile);

		chunk_size = (buffer[7] | buffer[6] << 8 | buffer[5] << 16 | buffer[4] << 24);

		//      printf("Chunk type: %c%c%c%c, size %x\n", buffer[0], buffer[1], buffer[2], buffer[3], chunk_size);

				// we want the DAOX chunk, which has the TOC information
		if (!memcmp(buffer, "DAOX", 4))
		{
			// skip second chunk size and UPC code
			fseek(infile, 20, SEEK_CUR);

			fread(&start, 1, 1, infile);
			fread(&end, 1, 1, infile);

			//          printf("Start track %d  End track: %d\n", start, end);

			outtoc.numtrks = (end - start) + 1;

			offset = 0;
			for (track = start; track <= end; track++)
			{
				uint32_t size, mode;
				uint64_t index0, index1, track_end;

				fseek(infile, 12, SEEK_CUR);    // skip ISRC code
				size = read_uint16(infile);
				mode = read_uint16(infile);
				fseek(infile, 2, SEEK_CUR);
				index0 = read_uint64(infile);
				index1 = read_uint64(infile);
				track_end = read_uint64(infile);

				//              printf("Track %d: sector size %d mode %x index0 %llx index1 %llx track_end %llx (pregap %d sectors, length %d sectors)\n", track, size, mode, index0, index1, track_end, (uint32_t)(index1-index0)/size, (uint32_t)(track_end-index1)/size);
				outinfo.track[track - 1].fname.assign(tocfname);
				outinfo.track[track - 1].offset = offset + (uint32_t)(index1 - index0);
				outinfo.track[track - 1].idx0offs = 0;
				outinfo.track[track - 1].idx1offs = 0;

				switch (mode)
				{
				case 0x0000:    // 2048 byte data
					outtoc.tracks[track - 1].trktype = CD_TRACK_MODE1;
					outinfo.track[track - 1].swap = false;
					break;

				case 0x0300:    // Mode 2 Form 1
					printf("ERROR: Mode 2 Form 1 tracks not supported\n");
					fclose(infile);
					return chd_file::error::UNSUPPORTED_FORMAT;

				case 0x0500:    // raw data
					printf("ERROR: Raw data tracks not supported\n");
					fclose(infile);
					return chd_file::error::UNSUPPORTED_FORMAT;

				case 0x0600:    // 2352 byte mode 2 raw
					outtoc.tracks[track - 1].trktype = CD_TRACK_MODE2_RAW;
					outinfo.track[track - 1].swap = false;
					break;

				case 0x0700:    // 2352 byte audio
					outtoc.tracks[track - 1].trktype = CD_TRACK_AUDIO;
					outinfo.track[track - 1].swap = true;
					break;

				case 0x0f00:    // raw data with sub-channel
					printf("ERROR: Raw data tracks with sub-channel not supported\n");
					fclose(infile);
					return chd_file::error::UNSUPPORTED_FORMAT;

				case 0x1000:    // audio with sub-channel
					printf("ERROR: Audio tracks with sub-channel not supported\n");
					fclose(infile);
					return chd_file::error::UNSUPPORTED_FORMAT;

				case 0x1100:    // raw Mode 2 Form 1 with sub-channel
					printf("ERROR: Raw Mode 2 Form 1 tracks with sub-channel not supported\n");
					fclose(infile);
					return chd_file::error::UNSUPPORTED_FORMAT;

				default:
					printf("ERROR: Unknown track type %x, contact MAMEDEV!\n", mode);
					fclose(infile);
					return chd_file::error::UNSUPPORTED_FORMAT;
				}

				outtoc.tracks[track - 1].datasize = size;

				outtoc.tracks[track - 1].subtype = CD_SUB_NONE;
				outtoc.tracks[track - 1].subsize = 0;

				outtoc.tracks[track - 1].pregap = (uint32_t)(index1 - index0) / size;
				outtoc.tracks[track - 1].frames = (uint32_t)(track_end - index1) / size;
				outtoc.tracks[track - 1].postgap = 0;
				outtoc.tracks[track - 1].pgtype = 0;
				outtoc.tracks[track - 1].pgsub = CD_SUB_NONE;
				outtoc.tracks[track - 1].pgdatasize = 0;
				outtoc.tracks[track - 1].pgsubsize = 0;
				outtoc.tracks[track - 1].padframes = 0;

				offset += (uint32_t)track_end - index1;
			}
		}

		if (!memcmp(buffer, "END!", 4))
		{
			done = 1;
		}
		else
		{
			chain_offs += chunk_size + 8;
		}
	}

	fclose(infile);

	return std::error_condition();
}

/*-------------------------------------------------
	chdcd_parse_iso - parse a .ISO file
-------------------------------------------------*/

/**
 * @fn  std::error_condition chdcd_parse_iso(const char *tocfname, cdrom_toc &outtoc, chdcd_track_input_info &outinfo)
 *
 * @brief   Chdcd parse ISO.
 *
 * @param   tocfname        The tocfname.
 * @param [in,out]  outtoc  The outtoc.
 * @param [in,out]  outinfo The outinfo.
 *
 * @return  A std::error_condition.
 */

std::error_condition chdcd_parse_iso(const char* tocfname, cdrom_toc& outtoc, chdcd_track_input_info& outinfo)
{
	std::string path = std::string(tocfname);

	FILE* infile = fopen(tocfname, "rb");
	if (!infile)
	{
		return std::error_condition(errno, std::generic_category());
	}

	path = get_file_path(path);

	/* clear structures */
	memset(&outtoc, 0, sizeof(outtoc));
	outinfo.reset();

	uint64_t size = get_file_size(tocfname);
	fclose(infile);


	outtoc.numtrks = 1;

	outinfo.track[0].fname = tocfname;
	outinfo.track[0].offset = 0;
	outinfo.track[0].idx0offs = 0;
	outinfo.track[0].idx1offs = 0;

	if ((size % 2048) == 0) {
		outtoc.tracks[0].trktype = CD_TRACK_MODE1;
		outtoc.tracks[0].frames = size / 2048;
		outtoc.tracks[0].datasize = 2048;
		outinfo.track[0].swap = false;
	}
	else if ((size % 2336) == 0) {
		// 2352 byte mode 2
		outtoc.tracks[0].trktype = CD_TRACK_MODE2;
		outtoc.tracks[0].frames = size / 2336;
		outtoc.tracks[0].datasize = 2336;
		outinfo.track[0].swap = false;
	}
	else if ((size % 2352) == 0) {
		// 2352 byte mode 2 raw
		outtoc.tracks[0].trktype = CD_TRACK_MODE2_RAW;
		outtoc.tracks[0].frames = size / 2352;
		outtoc.tracks[0].datasize = 2352;
		outinfo.track[0].swap = false;
	}
	else {
		printf("ERROR: Unrecognized track type\n");
		return chd_file::error::UNSUPPORTED_FORMAT;
	}

	outtoc.tracks[0].subtype = CD_SUB_NONE;
	outtoc.tracks[0].subsize = 0;

	outtoc.tracks[0].pregap = 0;

	outtoc.tracks[0].postgap = 0;
	outtoc.tracks[0].pgtype = 0;
	outtoc.tracks[0].pgsub = CD_SUB_NONE;
	outtoc.tracks[0].pgdatasize = 0;
	outtoc.tracks[0].pgsubsize = 0;
	outtoc.tracks[0].padframes = 0;


	return std::error_condition();
}

/*-------------------------------------------------
	chdcd_parse_gdi - parse a Sega GD-ROM rip
-------------------------------------------------*/

/**
 * @fn  static std::error_condition chdcd_parse_gdi(const char *tocfname, cdrom_toc &outtoc, chdcd_track_input_info &outinfo)
 *
 * @brief   Chdcd parse GDI.
 *
 * @param   tocfname        The tocfname.
 * @param [in,out]  outtoc  The outtoc.
 * @param [in,out]  outinfo The outinfo.
 *
 * @return  A std::error_condition.
 */

static std::error_condition chdcd_parse_gdi(const char* tocfname, cdrom_toc& outtoc, chdcd_track_input_info& outinfo)
{
	int i, numtracks;

	std::string path = std::string(tocfname);

	FILE* infile = fopen(tocfname, "rt");
	if (!infile)
	{
		return std::error_condition(errno, std::generic_category());
	}

	path = get_file_path(path);

	/* clear structures */
	memset(&outtoc, 0, sizeof(outtoc));
	outinfo.reset();

	outtoc.flags = CD_FLAG_GDROM;

	fgets(linebuffer, 511, infile);
	numtracks = atoi(linebuffer);

	for (i = 0; i < numtracks; ++i)
	{
		char* tok;
		int trknum;
		int trksize, trktype;
		int sz;

		fgets(linebuffer, 511, infile);

		tok = strtok(linebuffer, " ");

		trknum = atoi(tok) - 1;

		outinfo.track[trknum].swap = false;
		outinfo.track[trknum].offset = 0;

		outtoc.tracks[trknum].datasize = 0;
		outtoc.tracks[trknum].subtype = CD_SUB_NONE;
		outtoc.tracks[trknum].subsize = 0;
		outtoc.tracks[trknum].pgsub = CD_SUB_NONE;

		tok = strtok(nullptr, " ");
		outtoc.tracks[trknum].physframeofs = atoi(tok);

		tok = strtok(nullptr, " ");
		trktype = atoi(tok);

		tok = strtok(nullptr, " ");
		trksize = atoi(tok);

		if (trktype == 4 && trksize == 2352)
		{
			outtoc.tracks[trknum].trktype = CD_TRACK_MODE1_RAW;
			outtoc.tracks[trknum].datasize = 2352;
		}
		if (trktype == 4 && trksize == 2048)
		{
			outtoc.tracks[trknum].trktype = CD_TRACK_MODE1;
			outtoc.tracks[trknum].datasize = 2048;
		}
		if (trktype == 0)
		{
			outtoc.tracks[trknum].trktype = CD_TRACK_AUDIO;
			outtoc.tracks[trknum].datasize = 2352;
			outinfo.track[trknum].swap = true;
		}

		std::string name;

		tok = strtok(nullptr, " ");
		name = tok;
		if (tok[0] == '"') {
			do {
				tok = strtok(nullptr, " ");
				if (tok != nullptr) {
					name += " ";
					name += tok;
				}
			} while (tok != nullptr && (strrchr(tok, '"') - tok != (strlen(tok) - 1)));
			strdelchr(name, '"');
		}
		outinfo.track[trknum].fname.assign(path).append(name);

		sz = get_file_size(outinfo.track[trknum].fname.c_str());

		outtoc.tracks[trknum].frames = sz / trksize;
		outtoc.tracks[trknum].padframes = 0;

		if (trknum != 0)
		{
			int dif = outtoc.tracks[trknum].physframeofs - (outtoc.tracks[trknum - 1].frames + outtoc.tracks[trknum - 1].physframeofs);
			outtoc.tracks[trknum - 1].frames += dif;
			outtoc.tracks[trknum - 1].padframes = dif;
		}
	}

#if 0
	for (i = 0; i < numtracks; i++)
	{
		printf("%s %d %d %d (true %d)\n", outinfo.track[i].fname.c_str(), outtoc.tracks[i].frames, outtoc.tracks[i].padframes, outtoc.tracks[i].physframeofs, outtoc.tracks[i].frames - outtoc.tracks[i].padframes);
	}
#endif

	/* close the input TOC */
	fclose(infile);

	/* store the number of tracks found */
	outtoc.numtrks = numtracks;

	return std::error_condition();
}

/*-------------------------------------------------
	chdcd_parse_cue - parse a CDRWin format CUE file
-------------------------------------------------*/

/**
 * @fn  std::error_condition chdcd_parse_cue(const char *tocfname, cdrom_toc &outtoc, chdcd_track_input_info &outinfo)
 *
 * @brief   Chdcd parse cue.
 *
 * @param   tocfname        The tocfname.
 * @param [in,out]  outtoc  The outtoc.
 * @param [in,out]  outinfo The outinfo.
 *
 * @return  A std::error_condition.
 */

std::error_condition chdcd_parse_cue(const char* tocfname, cdrom_toc& outtoc, chdcd_track_input_info& outinfo)
{
	int i, trknum;
	static char token[512];
	std::string lastfname;
	uint32_t wavlen, wavoffs;
	std::string path = std::string(tocfname);

	FILE* infile = fopen(tocfname, "rt");
	if (!infile)
	{
		return std::error_condition(errno, std::generic_category());
	}

	path = get_file_path(path);

	/* clear structures */
	memset(&outtoc, 0, sizeof(outtoc));
	outinfo.reset();

	trknum = -1;
	wavoffs = wavlen = 0;

	while (!feof(infile))
	{
		/* get the next line */
		fgets(linebuffer, 511, infile);

		/* if EOF didn't hit, keep going */
		if (!feof(infile))
		{
			i = 0;

			TOKENIZE

				if (!strcmp(token, "FILE"))
				{
					/* found the data file for a track */
					TOKENIZE

						/* keep the filename */
						lastfname.assign(path).append(token);

					/* get the file type */
					TOKENIZE

						if (!strcmp(token, "BINARY"))
						{
							outinfo.track[trknum + 1].swap = false;
						}
						else if (!strcmp(token, "MOTOROLA"))
						{
							outinfo.track[trknum + 1].swap = true;
						}
						else if (!strcmp(token, "WAVE"))
						{
							wavlen = parse_wav_sample(lastfname.c_str(), &wavoffs);
							if (!wavlen)
							{
								fclose(infile);
								printf("ERROR: couldn't read [%s] or not a valid .WAV\n", lastfname.c_str());
								return chd_file::error::INVALID_DATA;
							}
						}
						else
						{
							fclose(infile);
							printf("ERROR: Unhandled track type %s\n", token);
							return chd_file::error::UNSUPPORTED_FORMAT;
						}
				}
				else if (!strcmp(token, "TRACK"))
				{
					/* get the track number */
					TOKENIZE
						trknum = strtoul(token, nullptr, 10) - 1;

					/* next token on the line is the track type */
					TOKENIZE

						if (wavlen != 0)
						{
							outtoc.tracks[trknum].trktype = CD_TRACK_AUDIO;
							outtoc.tracks[trknum].frames = wavlen / 2352;
							outinfo.track[trknum].offset = wavoffs;
							wavoffs = wavlen = 0;
						}
						else
						{
							outtoc.tracks[trknum].trktype = CD_TRACK_MODE1;
							outtoc.tracks[trknum].datasize = 0;
							outinfo.track[trknum].offset = 0;
						}
					outtoc.tracks[trknum].subtype = CD_SUB_NONE;
					outtoc.tracks[trknum].subsize = 0;
					outtoc.tracks[trknum].pgsub = CD_SUB_NONE;
					outtoc.tracks[trknum].pregap = 0;
					outtoc.tracks[trknum].padframes = 0;
					outinfo.track[trknum].idx0offs = -1;
					outinfo.track[trknum].idx1offs = 0;

					outinfo.track[trknum].fname.assign(lastfname); // default filename to the last one

	//              printf("trk %d: fname %s offset %d\n", trknum, outinfo.track[trknum].fname.c_str(), outinfo.track[trknum].offset);

					cdrom_convert_type_string_to_track_info(token, &outtoc.tracks[trknum]);
					if (outtoc.tracks[trknum].datasize == 0)
					{
						fclose(infile);
						printf("ERROR: Unknown track type [%s].  Contact MAMEDEV.\n", token);
						return chd_file::error::UNSUPPORTED_FORMAT;
					}

					/* next (optional) token on the line is the subcode type */
					TOKENIZE

						cdrom_convert_subtype_string_to_track_info(token, &outtoc.tracks[trknum]);
				}
				else if (!strcmp(token, "INDEX"))   /* only in bin/cue files */
				{
					int idx, frames;

					/* get index number */
					TOKENIZE
						idx = strtoul(token, nullptr, 10);

					/* get index */
					TOKENIZE
						frames = msf_to_frames(token);

					if (idx == 0)
					{
						outinfo.track[trknum].idx0offs = frames;
					}
					else if (idx == 1)
					{
						outinfo.track[trknum].idx1offs = frames;
						if ((outtoc.tracks[trknum].pregap == 0) && (outinfo.track[trknum].idx0offs != -1))
						{
							outtoc.tracks[trknum].pregap = frames - outinfo.track[trknum].idx0offs;
							outtoc.tracks[trknum].pgtype = outtoc.tracks[trknum].trktype;
							switch (outtoc.tracks[trknum].pgtype)
							{
							case CD_TRACK_MODE1:
							case CD_TRACK_MODE2_FORM1:
								outtoc.tracks[trknum].pgdatasize = 2048;
								break;

							case CD_TRACK_MODE1_RAW:
							case CD_TRACK_MODE2_RAW:
							case CD_TRACK_AUDIO:
								outtoc.tracks[trknum].pgdatasize = 2352;
								break;

							case CD_TRACK_MODE2:
							case CD_TRACK_MODE2_FORM_MIX:
								outtoc.tracks[trknum].pgdatasize = 2336;
								break;

							case CD_TRACK_MODE2_FORM2:
								outtoc.tracks[trknum].pgdatasize = 2324;
								break;
							}
						}
						else    // pregap sectors not in file, but we're always using idx0ofs for track length calc now
						{
							outinfo.track[trknum].idx0offs = frames;
						}
					}
				}
				else if (!strcmp(token, "PREGAP"))
				{
					int frames;

					/* get index */
					TOKENIZE
						frames = msf_to_frames(token);

					outtoc.tracks[trknum].pregap = frames;
				}
				else if (!strcmp(token, "POSTGAP"))
				{
					int frames;

					/* get index */
					TOKENIZE
						frames = msf_to_frames(token);

					outtoc.tracks[trknum].postgap = frames;
				}
		}
	}

	/* close the input CUE */
	fclose(infile);

	/* store the number of tracks found */
	outtoc.numtrks = trknum + 1;

	/* now go over the files again and set the lengths */
	for (trknum = 0; trknum < outtoc.numtrks; trknum++)
	{
		uint64_t tlen = 0;

		// this is true for cue/bin and cue/iso, and we need it for cue/wav since .WAV is little-endian
		if (outtoc.tracks[trknum].trktype == CD_TRACK_AUDIO)
		{
			outinfo.track[trknum].swap = true;
		}

		// don't do this for .WAV tracks, we already have their length and offset filled out
		if (outinfo.track[trknum].offset == 0)
		{
			// is this the last track?
			if (trknum == (outtoc.numtrks - 1))
			{
				/* if we have the same filename as the last track, do it that way */
				if (trknum != 0 && (outinfo.track[trknum].fname.compare(outinfo.track[trknum - 1].fname) == 0))
				{
					tlen = get_file_size(outinfo.track[trknum].fname.c_str());
					if (tlen == 0)
					{
						printf("ERROR: couldn't find bin file [%s]\n", outinfo.track[trknum - 1].fname.c_str());
						return std::errc::no_such_file_or_directory;
					}
					outinfo.track[trknum].offset = outinfo.track[trknum - 1].offset + outtoc.tracks[trknum - 1].frames * (outtoc.tracks[trknum - 1].datasize + outtoc.tracks[trknum - 1].subsize);
					outtoc.tracks[trknum].frames = (tlen - outinfo.track[trknum].offset) / (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);
				}
				else    /* data files are different */
				{
					tlen = get_file_size(outinfo.track[trknum].fname.c_str());
					if (tlen == 0)
					{
						printf("ERROR: couldn't find bin file [%s]\n", outinfo.track[trknum - 1].fname.c_str());
						return std::errc::no_such_file_or_directory;
					}
					tlen /= (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);
					outtoc.tracks[trknum].frames = tlen;
					outinfo.track[trknum].offset = 0;
				}
			}
			else
			{
				/* if we have the same filename as the next track, do it that way */
				if (outinfo.track[trknum].fname.compare(outinfo.track[trknum + 1].fname) == 0)
				{
					outtoc.tracks[trknum].frames = outinfo.track[trknum + 1].idx0offs - outinfo.track[trknum].idx0offs;

					if (trknum == 0)    // track 0 offset is 0
					{
						outinfo.track[trknum].offset = 0;
					}
					else
					{
						outinfo.track[trknum].offset = outinfo.track[trknum - 1].offset + outtoc.tracks[trknum - 1].frames * (outtoc.tracks[trknum - 1].datasize + outtoc.tracks[trknum - 1].subsize);
					}

					if (!outtoc.tracks[trknum].frames)
					{
						printf("ERROR: unable to determine size of track %d, missing INDEX 01 markers?\n", trknum + 1);
						return chd_file::error::INVALID_DATA;
					}
				}
				else    /* data files are different */
				{
					tlen = get_file_size(outinfo.track[trknum].fname.c_str());
					if (tlen == 0)
					{
						printf("ERROR: couldn't find bin file [%s]\n", outinfo.track[trknum].fname.c_str());
						return std::errc::no_such_file_or_directory;
					}
					tlen /= (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);
					outtoc.tracks[trknum].frames = tlen;
					outinfo.track[trknum].offset = 0;
				}
			}
		}
		//printf("trk %d: %d frames @ offset %d\n", trknum+1, outtoc.tracks[trknum].frames, outinfo.track[trknum].offset);
	}

	return std::error_condition();
}

/*---------------------------------------------------------------------------------------
	chdcd_is_gdicue - determine if CUE contains Redump multi-CUE format for Dreamcast GDI
----------------------------------------------------------------------------------------*/

/**
 * Dreamcast GDI has two images on one disc, SINGLE-DENSITY and HIGH-DENSITY.
 *
 * Redump stores both images in a single .cue with a REM comment separating the images.
 * This multi-cue format replaces the old flawed .gdi format.
 *
 *    http://forum.redump.org/topic/19969/done-sega-dreamcast-multicue-gdi/
 *
 * This function looks for strings "REM SINGLE-DENSITY AREA" & "REM HIGH-DENSITY AREA"
 * indicating the Redump multi-cue format and therefore a Dreamcast GDI disc.
 */

bool chdcd_is_gdicue(const char* tocfname)
{
	bool has_rem_singledensity = false;
	bool has_rem_highdensity = false;
	std::string path = std::string(tocfname);

	FILE* infile = fopen(tocfname, "rt");
	if (!infile)
	{
		return false;
	}

	path = get_file_path(path);

	while (!feof(infile))
	{
		fgets(linebuffer, 511, infile);

		/* if EOF didn't hit, keep going */
		if (!feof(infile))
		{
			has_rem_singledensity = has_rem_singledensity || !strncmp(linebuffer, "REM SINGLE-DENSITY AREA", 23);
			has_rem_highdensity = has_rem_highdensity || !strncmp(linebuffer, "REM HIGH-DENSITY AREA", 21);
		}
	}

	fclose(infile);

	return has_rem_singledensity && has_rem_highdensity;
}

/*-----------------------------------------------------------------
	chdcd_parse_gdicue - parse a Redump multi-CUE for Dreamcast GDI
------------------------------------------------------------------*/

/**
 * @fn  std::error_condition chdcd_parse_gdicue(const char *tocfname, cdrom_toc &outtoc, chdcd_track_input_info &outinfo)
 *
 * @brief   Chdcd parse cue.
 *
 * @param   tocfname        The tocfname.
 * @param [in,out]  outtoc  The outtoc.
 * @param [in,out]  outinfo The outinfo.
 *
 * @return  A std::error_condition.
 *
 * Dreamcast discs have two images on a single disc. The first image is SINGLE-DENSITY and the second image
 * is HIGH-DENSITY. The SINGLE-DENSITY area starts 0 LBA and HIGH-DENSITY area starts 45000 LBA.
 *
 * There are three Dreamcast disc patterns.
 *
 *   Pattern I - (SD) DATA + AUDIO, (HD) DATA
 *   Pattern II - (SD) DATA + AUDIO, (HD) DATA + ... + AUDIO
 *   Pattern III - (SD) DATA + AUDIO, (HD) DATA + ... + DATA
 *
 * TOSEC layout is preferred and this code adjusts the TOC and INFO generated by a Redump .cue to match the
 * layout from a TOSEC .gdi.
 */

std::error_condition chdcd_parse_gdicue(const char* tocfname, cdrom_toc& outtoc, chdcd_track_input_info& outinfo)
{
	int i, trknum;
	static char token[512];
	std::string lastfname;
	uint32_t wavlen, wavoffs;
	std::string path = std::string(tocfname);
	enum gdi_area current_area = SINGLE_DENSITY;
	enum gdi_pattern disc_pattern = TYPE_UNKNOWN;

	FILE* infile = fopen(tocfname, "rt");
	if (!infile)
	{
		return std::error_condition(errno, std::generic_category());
	}

	path = get_file_path(path);

	/* clear structures */
	memset(&outtoc, 0, sizeof(outtoc));
	outinfo.reset();

	trknum = -1;
	wavoffs = wavlen = 0;

	outtoc.flags = CD_FLAG_GDROM;

	while (!feof(infile))
	{
		/* get the next line */
		fgets(linebuffer, 511, infile);

		/* if EOF didn't hit, keep going */
		if (!feof(infile))
		{
			/* single-density area starts LBA = 0 */
			if (!strncmp(linebuffer, "REM SINGLE-DENSITY AREA", 23))
			{
				current_area = SINGLE_DENSITY;
				continue;
			}

			/* high-density area starts LBA = 45000 */
			if (!strncmp(linebuffer, "REM HIGH-DENSITY AREA", 21))
			{
				current_area = HIGH_DENSITY;
				continue;
			}

			i = 0;

			TOKENIZE

				if (!strcmp(token, "FILE"))
				{
					/* found the data file for a track */
					TOKENIZE

						/* keep the filename */
						lastfname.assign(path).append(token);

					/* get the file type */
					TOKENIZE

						if (!strcmp(token, "BINARY"))
						{
							outinfo.track[trknum + 1].swap = false;
						}
						else if (!strcmp(token, "MOTOROLA"))
						{
							outinfo.track[trknum + 1].swap = true;
						}
						else if (!strcmp(token, "WAVE"))
						{
							wavlen = parse_wav_sample(lastfname.c_str(), &wavoffs);
							if (!wavlen)
							{
								fclose(infile);
								printf("ERROR: couldn't read [%s] or not a valid .WAV\n", lastfname.c_str());
								return chd_file::error::INVALID_DATA;
							}
						}
						else
						{
							fclose(infile);
							printf("ERROR: Unhandled track type %s\n", token);
							return chd_file::error::UNSUPPORTED_FORMAT;
						}
				}
				else if (!strcmp(token, "TRACK"))
				{
					/* get the track number */
					TOKENIZE
						trknum = strtoul(token, nullptr, 10) - 1;

					/* next token on the line is the track type */
					TOKENIZE

						if (wavlen != 0)
						{
							outtoc.tracks[trknum].trktype = CD_TRACK_AUDIO;
							outtoc.tracks[trknum].frames = wavlen / 2352;
							outinfo.track[trknum].offset = wavoffs;
							wavoffs = wavlen = 0;
						}
						else
						{
							outtoc.tracks[trknum].trktype = CD_TRACK_MODE1;
							outtoc.tracks[trknum].datasize = 0;
							outinfo.track[trknum].offset = 0;
						}
					outtoc.tracks[trknum].subtype = CD_SUB_NONE;
					outtoc.tracks[trknum].subsize = 0;
					outtoc.tracks[trknum].pgsub = CD_SUB_NONE;
					outtoc.tracks[trknum].pregap = 0;
					outtoc.tracks[trknum].padframes = 0;
					outtoc.tracks[trknum].multicuearea = current_area;
					outinfo.track[trknum].idx0offs = -1;
					outinfo.track[trknum].idx1offs = 0;

					outinfo.track[trknum].fname.assign(lastfname); // default filename to the last one

#if 0
					printf("trk %d: fname %s offset %d area %d\n", trknum, outinfo.track[trknum].fname.c_str(), outinfo.track[trknum].offset, outtoc.tracks[trknum].multicuearea);
#endif

					cdrom_convert_type_string_to_track_info(token, &outtoc.tracks[trknum]);
					if (outtoc.tracks[trknum].datasize == 0)
					{
						fclose(infile);
						printf("ERROR: Unknown track type [%s].  Contact MAMEDEV.\n", token);
						return chd_file::error::UNSUPPORTED_FORMAT;
					}

					/* next (optional) token on the line is the subcode type */
					TOKENIZE

						cdrom_convert_subtype_string_to_track_info(token, &outtoc.tracks[trknum]);
				}
				else if (!strcmp(token, "INDEX"))   /* only in bin/cue files */
				{
					int idx, frames;

					/* get index number */
					TOKENIZE
						idx = strtoul(token, nullptr, 10);

					/* get index */
					TOKENIZE
						frames = msf_to_frames(token);

					if (idx == 0)
					{
						outinfo.track[trknum].idx0offs = frames;
					}
					else if (idx == 1)
					{
						outinfo.track[trknum].idx1offs = frames;
						if ((outtoc.tracks[trknum].pregap == 0) && (outinfo.track[trknum].idx0offs != -1))
						{
							outtoc.tracks[trknum].pregap = frames - outinfo.track[trknum].idx0offs;
							outtoc.tracks[trknum].pgtype = outtoc.tracks[trknum].trktype;
							switch (outtoc.tracks[trknum].pgtype)
							{
							case CD_TRACK_MODE1:
							case CD_TRACK_MODE2_FORM1:
								outtoc.tracks[trknum].pgdatasize = 2048;
								break;

							case CD_TRACK_MODE1_RAW:
							case CD_TRACK_MODE2_RAW:
							case CD_TRACK_AUDIO:
								outtoc.tracks[trknum].pgdatasize = 2352;
								break;

							case CD_TRACK_MODE2:
							case CD_TRACK_MODE2_FORM_MIX:
								outtoc.tracks[trknum].pgdatasize = 2336;
								break;

							case CD_TRACK_MODE2_FORM2:
								outtoc.tracks[trknum].pgdatasize = 2324;
								break;
							}
						}
						else    // pregap sectors not in file, but we're always using idx0ofs for track length calc now
						{
							outinfo.track[trknum].idx0offs = frames;
						}
					}
				}
				else if (!strcmp(token, "PREGAP"))
				{
					int frames;

					/* get index */
					TOKENIZE
						frames = msf_to_frames(token);

					outtoc.tracks[trknum].pregap = frames;
				}
				else if (!strcmp(token, "POSTGAP"))
				{
					int frames;

					/* get index */
					TOKENIZE
						frames = msf_to_frames(token);

					outtoc.tracks[trknum].postgap = frames;
				}
		}
	}

	/* close the input CUE */
	fclose(infile);

	/* store the number of tracks found */
	outtoc.numtrks = trknum + 1;

	/* now go over the files again and set the lengths */
	for (trknum = 0; trknum < outtoc.numtrks; trknum++)
	{
		uint64_t tlen = 0;

		// this is true for cue/bin and cue/iso, and we need it for cue/wav since .WAV is little-endian
		if (outtoc.tracks[trknum].trktype == CD_TRACK_AUDIO)
		{
			outinfo.track[trknum].swap = true;
		}

		// don't do this for .WAV tracks, we already have their length and offset filled out
		if (outinfo.track[trknum].offset == 0)
		{
			// is this the last track?
			if (trknum == (outtoc.numtrks - 1))
			{
				/* if we have the same filename as the last track, do it that way */
				if (trknum != 0 && (outinfo.track[trknum].fname.compare(outinfo.track[trknum - 1].fname) == 0))
				{
					tlen = get_file_size(outinfo.track[trknum].fname.c_str());
					if (tlen == 0)
					{
						printf("ERROR: couldn't find bin file [%s]\n", outinfo.track[trknum - 1].fname.c_str());
						return std::errc::no_such_file_or_directory;
					}
					outinfo.track[trknum].offset = outinfo.track[trknum - 1].offset + outtoc.tracks[trknum - 1].frames * (outtoc.tracks[trknum - 1].datasize + outtoc.tracks[trknum - 1].subsize);
					outtoc.tracks[trknum].frames = (tlen - outinfo.track[trknum].offset) / (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);
				}
				else    /* data files are different */
				{
					tlen = get_file_size(outinfo.track[trknum].fname.c_str());
					if (tlen == 0)
					{
						printf("ERROR: couldn't find bin file [%s]\n", outinfo.track[trknum - 1].fname.c_str());
						return std::errc::no_such_file_or_directory;
					}
					tlen /= (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);
					outtoc.tracks[trknum].frames = tlen;
					outinfo.track[trknum].offset = 0;
				}
			}
			else
			{
				/* if we have the same filename as the next track, do it that way */
				if (outinfo.track[trknum].fname.compare(outinfo.track[trknum + 1].fname) == 0)
				{
					outtoc.tracks[trknum].frames = outinfo.track[trknum + 1].idx0offs - outinfo.track[trknum].idx0offs;

					if (trknum == 0)    // track 0 offset is 0
					{
						outinfo.track[trknum].offset = 0;
					}
					else
					{
						outinfo.track[trknum].offset = outinfo.track[trknum - 1].offset + outtoc.tracks[trknum - 1].frames * (outtoc.tracks[trknum - 1].datasize + outtoc.tracks[trknum - 1].subsize);
					}

					if (!outtoc.tracks[trknum].frames)
					{
						printf("ERROR: unable to determine size of track %d, missing INDEX 01 markers?\n", trknum + 1);
						return chd_file::error::INVALID_DATA;
					}
				}
				else    /* data files are different */
				{
					tlen = get_file_size(outinfo.track[trknum].fname.c_str());
					if (tlen == 0)
					{
						printf("ERROR: couldn't find bin file [%s]\n", outinfo.track[trknum].fname.c_str());
						return std::errc::no_such_file_or_directory;
					}
					tlen /= (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);
					outtoc.tracks[trknum].frames = tlen;
					outinfo.track[trknum].offset = 0;
				}
			}
		}
	}

	/*
	 * Dreamcast patterns are identified by track types and number of tracks
	 */
	if (outtoc.numtrks > 4 && outtoc.tracks[outtoc.numtrks - 1].pgtype == CD_TRACK_MODE1_RAW)
	{
		if (outtoc.tracks[outtoc.numtrks - 2].pgtype == CD_TRACK_AUDIO)
			disc_pattern = TYPE_III_SPLIT;
		else
			disc_pattern = TYPE_III;
	}
	else if (outtoc.numtrks > 3)
	{
		if (outtoc.tracks[outtoc.numtrks - 1].pgtype == CD_TRACK_AUDIO)
			disc_pattern = TYPE_II;
		else
			disc_pattern = TYPE_III;
	}
	else if (outtoc.numtrks == 3)
	{
		disc_pattern = TYPE_I;
	}

	/*
	 * Strip pregaps from Redump tracks and adjust the LBA offset to match TOSEC layout
	 */
	for (trknum = 1; trknum < outtoc.numtrks; trknum++)
	{
		uint32_t prev_pregap = outtoc.tracks[trknum - 1].pregap;
		uint32_t prev_offset = prev_pregap * (outtoc.tracks[trknum - 1].datasize + outtoc.tracks[trknum - 1].subsize);
		uint32_t this_pregap = outtoc.tracks[trknum].pregap;
		uint32_t this_offset = this_pregap * (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);

		if (outtoc.tracks[trknum - 1].pgtype != CD_TRACK_AUDIO)
		{
			// pad previous DATA track to match TOSEC layout
			outtoc.tracks[trknum - 1].frames += this_pregap;
			outtoc.tracks[trknum - 1].padframes += this_pregap;
		}

		if (outtoc.tracks[trknum - 1].pgtype == CD_TRACK_AUDIO && outtoc.tracks[trknum].pgtype == CD_TRACK_AUDIO)
		{
			// shift previous AUDIO track to match TOSEC layout
			outinfo.track[trknum - 1].offset += prev_offset;
			outtoc.tracks[trknum - 1].splitframes += prev_pregap;
		}

		if (outtoc.tracks[trknum - 1].pgtype == CD_TRACK_AUDIO && outtoc.tracks[trknum].pgtype != CD_TRACK_AUDIO)
		{
			// shrink previous AUDIO track to match TOSEC layout
			outtoc.tracks[trknum - 1].frames -= prev_pregap;
			outinfo.track[trknum - 1].offset += prev_offset;
		}

		if (outtoc.tracks[trknum].pgtype == CD_TRACK_AUDIO && trknum == outtoc.numtrks - 1)
		{
			// shrink final AUDIO track to match TOSEC layout
			outtoc.tracks[trknum].frames -= this_pregap;
			outinfo.track[trknum].offset += this_offset;
		}
	}

	/*
	 * Special handling for TYPE_III_SPLIT, pregap in last track contains 75 frames audio and 150 frames data
	 */
	if (disc_pattern == TYPE_III_SPLIT)
	{
		assert(outtoc.tracks[outtoc.numtrks - 1].pregap == 225);

		// grow the AUDIO track into DATA track by 75 frames as per Pattern III
		outtoc.tracks[outtoc.numtrks - 2].frames += 225;
		outtoc.tracks[outtoc.numtrks - 2].padframes += 150;
		outinfo.track[outtoc.numtrks - 2].offset = 150 * (outtoc.tracks[outtoc.numtrks - 2].datasize + outtoc.tracks[outtoc.numtrks - 2].subsize);
		outtoc.tracks[outtoc.numtrks - 2].splitframes = 75;

		// skip the pregap when reading the DATA track
		outtoc.tracks[outtoc.numtrks - 1].frames -= 225;
		outinfo.track[outtoc.numtrks - 1].offset += 225 * (outtoc.tracks[outtoc.numtrks - 1].datasize + outtoc.tracks[outtoc.numtrks - 1].subsize);
	}

	/*
	 * TOC now matches TOSEC layout, set LBA for every track with HIGH-DENSITY area @ LBA 45000
	 */
	for (trknum = 1; trknum < outtoc.numtrks; trknum++)
	{
		if (outtoc.tracks[trknum].multicuearea == HIGH_DENSITY && outtoc.tracks[trknum - 1].multicuearea == SINGLE_DENSITY)
		{
			outtoc.tracks[trknum].physframeofs = 45000;
			int dif = outtoc.tracks[trknum].physframeofs - (outtoc.tracks[trknum - 1].frames + outtoc.tracks[trknum - 1].physframeofs);
			outtoc.tracks[trknum - 1].frames += dif;
			outtoc.tracks[trknum - 1].padframes = dif;
		}
		else
		{
			outtoc.tracks[trknum].physframeofs = outtoc.tracks[trknum - 1].physframeofs + outtoc.tracks[trknum - 1].frames;
		}

		// no longer need the pregap info, zeroed out to match TOSEC layout
		outtoc.tracks[trknum].pregap = 0;
		outtoc.tracks[trknum].pgtype = 0;
	}

#if 0
	for (trknum = 0; trknum < outtoc.numtrks; trknum++)
	{
		printf("trk %d: %d frames @ offset %d, pad=%d, split=%d, area=%d, phys=%d, pregap=%d, pgtype=%d, idx0=%d, idx1=%d, (true %d)\n",
			trknum + 1,
			outtoc.tracks[trknum].frames,
			outinfo.track[trknum].offset,
			outtoc.tracks[trknum].padframes,
			outtoc.tracks[trknum].splitframes,
			outtoc.tracks[trknum].multicuearea,
			outtoc.tracks[trknum].physframeofs,
			outtoc.tracks[trknum].pregap,
			outtoc.tracks[trknum].pgtype,
			outinfo.track[trknum].idx0offs,
			outinfo.track[trknum].idx1offs,
			outtoc.tracks[trknum].frames - outtoc.tracks[trknum].padframes);
	}
#endif

	return std::error_condition();
}

/*-------------------------------------------------
	chdcd_parse_toc - parse a CDRDAO format TOC file
-------------------------------------------------*/

/**
 * @fn  std::error_condition chdcd_parse_toc(const char *tocfname, cdrom_toc &outtoc, chdcd_track_input_info &outinfo)
 *
 * @brief   Chdcd parse TOC.
 *
 * @param   tocfname        The tocfname.
 * @param [in,out]  outtoc  The outtoc.
 * @param [in,out]  outinfo The outinfo.
 *
 * @return  A std::error_condition.
 */

std::error_condition chdcd_parse_toc(const char* tocfname, cdrom_toc& outtoc, chdcd_track_input_info& outinfo)
{
	int i, trknum;
	static char token[512];
	char tocftemp[512];

	strcpy(tocftemp, tocfname);
	for (i = 0; i < strlen(tocfname); i++)
	{
		tocftemp[i] = tolower(tocftemp[i]);
	}

	if (strstr(tocftemp, ".gdi"))
	{
		return chdcd_parse_gdi(tocfname, outtoc, outinfo);
	}

	if (strstr(tocftemp, ".cue"))
	{
		if (chdcd_is_gdicue(tocfname))
			return chdcd_parse_gdicue(tocfname, outtoc, outinfo);
		else
			return chdcd_parse_cue(tocfname, outtoc, outinfo);
	}

	if (strstr(tocftemp, ".nrg"))
	{
		return chdcd_parse_nero(tocfname, outtoc, outinfo);
	}

	if (strstr(tocftemp, ".iso") || strstr(tocftemp, ".cdr") || strstr(tocftemp, ".toast"))
	{
		return chdcd_parse_iso(tocfname, outtoc, outinfo);
	}

	std::string path = std::string(tocfname);

	FILE* infile = fopen(tocfname, "rt");
	if (!infile)
	{
		return std::error_condition(errno, std::generic_category());
	}

	path = get_file_path(path);

	/* clear structures */
	memset(&outtoc, 0, sizeof(outtoc));
	outinfo.reset();

	trknum = -1;

	while (!feof(infile))
	{
		/* get the next line */
		fgets(linebuffer, 511, infile);

		/* if EOF didn't hit, keep going */
		if (!feof(infile))
		{
			i = 0;

			TOKENIZE

				if ((!strcmp(token, "DATAFILE")) || (!strcmp(token, "AUDIOFILE")) || (!strcmp(token, "FILE")))
				{
					int f;

					/* found the data file for a track */
					TOKENIZE

						/* keep the filename */
						outinfo.track[trknum].fname.assign(path).append(token);

					/* get either the offset or the length */
					TOKENIZE

						if (!strcmp(token, "SWAP"))
						{
							TOKENIZE

								outinfo.track[trknum].swap = true;
						}
						else
						{
							outinfo.track[trknum].swap = false;
						}

					if (token[0] == '#')
					{
						/* it's a decimal offset, use it */
						f = strtoul(&token[1], nullptr, 10);
					}
					else if (isdigit((uint8_t)token[0]))
					{
						/* convert the time to an offset */
						f = msf_to_frames(token);

						f *= (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);
					}
					else
					{
						f = 0;
					}

					outinfo.track[trknum].offset = f;

					TOKENIZE

						if (isdigit((uint8_t)token[0]))
						{
							// this could be the length or an offset from the previous field.
							f = msf_to_frames(token);

							TOKENIZE

								if (isdigit((uint8_t)token[0]))
								{
									// it was an offset.
									f *= (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);

									outinfo.track[trknum].offset += f;

									// this is the length.
									f = msf_to_frames(token);
								}
						}
						else if (trknum == 0 && outinfo.track[trknum].offset != 0)
						{
							/* the 1st track might have a length with no offset */
							f = outinfo.track[trknum].offset / (outtoc.tracks[trknum].datasize + outtoc.tracks[trknum].subsize);
							outinfo.track[trknum].offset = 0;
						}
						else
						{
							/* guesstimate the track length? */
							f = 0;
						}

					outtoc.tracks[trknum].frames = f;
				}
				else if (!strcmp(token, "TRACK"))
				{
					trknum++;

					/* next token on the line is the track type */
					TOKENIZE

						outtoc.tracks[trknum].trktype = CD_TRACK_MODE1;
					outtoc.tracks[trknum].datasize = 0;
					outtoc.tracks[trknum].subtype = CD_SUB_NONE;
					outtoc.tracks[trknum].subsize = 0;
					outtoc.tracks[trknum].pgsub = CD_SUB_NONE;
					outtoc.tracks[trknum].padframes = 0;

					cdrom_convert_type_string_to_track_info(token, &outtoc.tracks[trknum]);
					if (outtoc.tracks[trknum].datasize == 0)
					{
						fclose(infile);
						printf("ERROR: Unknown track type [%s].  Contact MAMEDEV.\n", token);
						return chd_file::error::UNSUPPORTED_FORMAT;
					}

					/* next (optional) token on the line is the subcode type */
					TOKENIZE

						cdrom_convert_subtype_string_to_track_info(token, &outtoc.tracks[trknum]);
				}
				else if (!strcmp(token, "START"))
				{
					int frames;

					/* get index */
					TOKENIZE
						frames = msf_to_frames(token);

					outtoc.tracks[trknum].pregap = frames;
				}
		}
	}

	/* close the input TOC */
	fclose(infile);

	/* store the number of tracks found */
	outtoc.numtrks = trknum + 1;

	return std::error_condition();
}
