/*
 * This file has been modified for the cdrkit suite.
 *
 * The behaviour and appearence of the program code below can differ to a major
 * extent from the version distributed by the original author(s).
 *
 * For details, see Changelog file distributed with the cdrkit package. If you
 * received this file from another source then ask the distributing person for
 * a log of modifications.
 *
 */

/* @(#)cd_extra.c	1.8 02/11/21 Copyright 2000-2001 Heiko Eissfeldt */

/* This is an include file! */
/**************** CD-Extra special treatment *********************************/

#include <ctype.h>

static unsigned long Read_CD_Extra_File(unsigned char *Extra_buf, unsigned long sector);

static unsigned long
Read_CD_Extra_File(unsigned char *Extra_buf, unsigned long sector)
{
	unsigned long mysec;
	
	/* read PVD */
	ReadCdRomData(get_scsi_p(), Extra_buf, sector+16, 1);

	/* check ISO signature */
	if (memcmp(Extra_buf, "\001CD001", 6) != 0) return 0;

	/* get path_table */
	mysec = Extra_buf[148] << 24;
	mysec |= Extra_buf[149] << 16;
	mysec |= Extra_buf[150] << 8;
	mysec |= Extra_buf[151];

	if (mysec <= sector) return 0;

	/* read path table */
	ReadCdRomData(get_scsi_p(), Extra_buf, mysec, 1);

	/* find cdplus subdirectory */
	{ unsigned char * p = Extra_buf;
		while (p+8 < Extra_buf + CD_FRAMESIZE_RAW) {
			int namelength;
			
			namelength = p[0] | (p[1] << 8);
			if (namelength == 6 &&
			    !memcmp(p+8, "CDPLUS", 6)) break;
			
			p += 8 + namelength + (namelength & 1);
		}
		if (p+8 >= Extra_buf + CD_FRAMESIZE_RAW) return 0;

		/* get extent */
		mysec = p[2] << 24;
		mysec |= p[3] << 16;
		mysec |= p[4] << 8;
		mysec |= p[5];
	}

	if (mysec <= sector) return 0;

	ReadCdRomData(get_scsi_p(), Extra_buf, mysec, 1);

	/* find file info.cdp */
	{ unsigned char * p = Extra_buf;
		while (p+33 < Extra_buf + CD_FRAMESIZE_RAW) {
			int namelength;
			
			namelength = p[32];
			if (namelength == 10 &&
			    !memcmp(p+33, "INFO.CDP;1", 10)) break;
			
			p += p[0];
		}
		if (p+33 >= Extra_buf + CD_FRAMESIZE_RAW) return 0;

		/* get extent */
		mysec = p[6] << 24;
		mysec |= p[7] << 16;
		mysec |= p[8] << 8;
		mysec |= p[9];
	}

	if (mysec <= sector) return 0;

	/* read file info.cdp */
	ReadCdRomData(get_scsi_p(), Extra_buf, mysec, 1);
	
	return mysec - sector;
}

static unsigned char Extra_buffer[CD_FRAMESIZE_RAW];

/*
 * Read the file cdplus/info.cdp from the cd extra disc.
 * This file has to reside at exactly 75 sectors after start of
 * the last session (according to Blue Book).
 * Of course, there are a lot dubious cd extras, which don't care :-(((
 * As an alternative method, we try reading through the iso9660 file system...
 */
static int Read_CD_Extra_Info(unsigned long sector);
static int Read_CD_Extra_Info(unsigned long sector)
{
  unsigned i;
  static int offsets[] = {
     75 		/* this is what blue book says */
  };

  for (i = 0; i < sizeof(offsets)/sizeof(int); i++) {
#ifdef DEBUG_XTRA
    fprintf(stderr, "debug: Read_CD_Extra_Info at sector %lu\n", sector+offsets[i]);
#endif
    ReadCdRomData(get_scsi_p(), Extra_buffer, sector+offsets[i], 1);

    /* If we are unlucky the drive cannot handle XA sectors by default.
       We try to compensate by ignoring the first eight bytes.
       Of course then we lack the last 8 bytes of the sector...
     */

    if (Extra_buffer[0] == 0)
      memmove(Extra_buffer, Extra_buffer +8, CD_FRAMESIZE - 8);

    /* check for cd extra */
    if (Extra_buffer[0] == 'C' && Extra_buffer[1] == 'D')
	return sector+offsets[i];

    /*
     * CD is not conforming to BlueBook!
     * Read the file through ISO9660 file system.
     */
    {
    unsigned long offset = Read_CD_Extra_File(Extra_buffer, sector);

    if (offset == 0) return 0;

    if (Extra_buffer[0] == 0)
      memmove(Extra_buffer, Extra_buffer +8, CD_FRAMESIZE - 8);

    /* check for cd extra */
    if (Extra_buffer[0] == 'C' && Extra_buffer[1] == 'D')
	return sector+offset;
    }
  }

  return 0;
}

static void Read_Subinfo(unsigned pos, unsigned length);
static void Read_Subinfo(unsigned pos, unsigned length)
{
  unsigned num_infos, num;
  unsigned char *Subp, *orgSubp;
  unsigned this_track = 0xff;
#ifdef DEBUG_XTRA
  unsigned char *up;
  unsigned char *sp;
  unsigned u;
  unsigned short s;
#endif

  length += 8;
  length = (length + CD_FRAMESIZE_RAW-1) / CD_FRAMESIZE_RAW;
  length *= CD_FRAMESIZE_RAW;
  orgSubp = Subp = malloc(length);

  if (Subp == NULL) {
    fprintf(stderr, "Read_Subinfo no memory(%d)\n",length);
    goto errorout;
  }

  ReadCdRomData(get_scsi_p(), Subp, pos, 1);

  num_infos = Subp[45]+(Subp[44] << 8);
#ifdef DEBUG_XTRA
  fprintf(stderr, "subinfo version %c%c.%c%c, %d info packets\n",
	  Subp[8],
	  Subp[9],
	  Subp[10],
	  Subp[11],
	  num_infos);
#endif
  length -= 46;
  Subp += 46;
  for (num = 0; num < num_infos && length > 0; num++) {
    unsigned id = *Subp;
    unsigned len = *(Subp +1);
#define	INFOPACKETTYPES	0x44
#ifdef	INFOPACKETSTRINGS
    static const char *infopacketID[INFOPACKETTYPES] = { "0", 
			      "track identifier", 
			      "album title",
			      "universal product code", 
			      "international standard book number",
			      "copyright",
			      "track title",
			      "notes",
			      "main interpret",
			      "secondary interpret",
			      "composer",
			      "original composer",
			      "creation date",
			      "release  date",
			      "publisher",
			      "0f",
			      "isrc audio track",
			      "isrc lyrics",
			      "isrc pictures",
			      "isrc MIDI data",
			      "14", "15", "16", "17", "18", "19",
			      "copyright state SUB_INFO",
			      "copyright state intro lyrics",
			      "copyright state lyrics",
			      "copyright state MIDI data",
			      "1e", "1f",
			      "intro lyrics",
			      "pointer to lyrics text file and length", 
			      "22", "23", "24", "25", "26", "27", "28",
			      "29", "2a", "2b", "2c", "2d", "2e", "2f",
			      "still picture descriptor",
			      "31",
			      "32", "33", "34", "35", "36", "37", "38",
			      "39", "3a", "3b", "3c", "3d", "3e", "3f",
			      "MIDI file descriptor",
			      "genre code",
			      "tempo",
			      "key"
			     };
#endif

    if (id >= INFOPACKETTYPES) {
      fprintf(stderr, "Off=%4d, ind=%2d/%2d, unknown Id=%2u, len=%2u ",
		/* this pointer difference is assumed to be small enough for an int. */
		(int)(Subp - orgSubp)
		, num, num_infos, id, len);
      Subp += 2 + 1;
      length -= 2 + 1;
      break;
    }
#ifdef DEBUG_XTRA
  fprintf(stderr, "info packet %d\n", id);
#endif

    switch (id) {
    case 1:    /* track nummer or 0 */
      this_track = 10 * (*(Subp + 2) - '0') + (*(Subp + 3) - '0');
      break;

    case 0x02: /* album title */
	if (global.disctitle == NULL) {
	    global.disctitle = malloc(len + 1);
	    if (global.disctitle != NULL) {
               memcpy(global.disctitle, Subp + 2, len);
	       global.disctitle[len] = '\0';
            }
        }
      break;
    case 0x03: /* media catalog number */
	if (Get_MCN()[0] == '\0' && Subp[2] != '\0' && len >= 13) {
            Set_MCN( Subp + 2);
        }
      break;
    case 0x06: /* track title */
	if (this_track > 0 && this_track < 100
	    && global.tracktitle[this_track] == NULL) {
            global.tracktitle[this_track] = malloc(len + 1);
            if (global.tracktitle[this_track] != NULL) {
               memcpy(global.tracktitle[this_track], Subp + 2, len);
               global.tracktitle[this_track][len] = '\0';
            }
        }
      break;
    case 0x05: /* copyright message */
	if (global.copyright_message == NULL) {
	    global.copyright_message = malloc(len + 1);
	    if (global.copyright_message != NULL) {
               memcpy(global.copyright_message, Subp + 2, len);
	       global.copyright_message[len] = '\0';
            }
        }
      break;
    case 0x08: /* creator */
	if (global.creator == NULL) {
	    global.creator = malloc(len + 1);
	    if (global.creator != NULL) {
               memcpy(global.creator, Subp + 2, len);
	       global.creator[len] = '\0';
            }
        }
      break;
    case 0x10: /* isrc */
	if (this_track > 0 && this_track < 100
	    && Get_ISRC(this_track)[0] == '\0' && Subp[2] != '\0'
	    && len >= 15) {
	       Set_ISRC(this_track, Subp + 2);
	}
      break;
#if 0
    case 0x04:
    case 0x07:
    case 0x09:
    case 0x0a:
    case 0x0b:
    case 0x0c:
    case 0x0d:
    case 0x0e:
    case 0x0f:
#ifdef	INFOPACKETSTRINGS
      fprintf(stderr, "%s: %*.*s\n",infopacketID[id], (int) len, (int) len, (Subp +2));
#endif
      break;
#ifdef DEBUG_XTRA
    case 0x1a:
    case 0x1b:
    case 0x1c:
    case 0x1d:
#ifdef	INFOPACKETSTRINGS
	fprintf(stderr, "%s %scopyrighted\n", infopacketID[id], *(Subp + 2) == 0 ? "not " : "");
#endif
      break;

    case 0x21:
      fprintf(stderr, "lyrics file beginning at sector %u",
	      (unsigned) GET_BE_UINT_FROM_CHARP(Subp + 2));
      if (len == 8)
	fprintf(stderr, ", having length: %u\n", 
                (unsigned) GET_BE_UINT_FROM_CHARP(Subp + 6));
      else
	fputs("\n", stderr);
      break;

    case 0x30:
      sp = Subp + 2;
      while (sp < Subp + 2 + len) {
      /*while (len >= 10) {*/
        s = be16_to_cpu((*(sp)) | (*(sp) << 8));
        fprintf(stderr, "%04x, ", s);
	sp += 2;
        up = sp;
	switch (s) {
	case 0:
	break;
	case 4:
	break;
	case 5:
	break;
	case 6:
	break;
        }
        u = GET_BE_UINT_FROM_CHARP(up);
        fprintf(stderr, "%04lx, ", (long) u);
        up += 4;
        u = GET_BE_UINT_FROM_CHARP(up);
        fprintf(stderr, "%04lx, ", (long) u);
        up += 4;
	sp += 8;
      }
      fputs("\n", stderr);
      break;

    case 0x40:
      fprintf(stderr, "MIDI file beginning at sector %u",
	      (unsigned) GET_BE_UINT_FROM_CHARP(Subp + 2));
      if (len == 8)
	fprintf(stderr, ", having length: %u\n", 
		(unsigned) GET_BE_UINT_FROM_CHARP(Subp + 6));
      else
	fputs("\n", stderr);
      break;

#ifdef	INFOPACKETSTRINGS
    case 0x42:
      fprintf(stderr, "%s: %d beats per minute\n",infopacketID[id], *(Subp + 2));
      break;
    case 0x41:
      if (len == 8)
        fprintf(stderr, "%s: %x, %x, %x, %x, %x, %x, %x, %x\n",
		infopacketID[id],
		*(Subp + 2),
		*(Subp + 3),
		*(Subp + 4),
		*(Subp + 5),
		*(Subp + 6),
		*(Subp + 7),
		*(Subp + 8),
		*(Subp + 9)
	);
      else
        fprintf(stderr, "%s:\n",infopacketID[id]);
      break;
    case 0x43:
      fprintf(stderr, "%s: %x\n",infopacketID[id], *(Subp + 2));
      break;
    default:
      fprintf(stderr, "%s: %*.*s\n",infopacketID[id], (int) len, (int) len, (Subp +2));
#endif
#endif
#endif
    }

    if (len & 1) len++;
    Subp += 2 + len;
    length -= 2 + len;
  }

/* cleanup */

  free(orgSubp);

errorout:
  return;

}

