/*
  AdPlug - Replayer for many OPL2/OPL3 audio file formats.
  Copyright (C) 1999 - 2008 Simon Peter <dn.tlp@gmx.net>, et al.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

  cff.cpp - BoomTracker loader by Riven the Mage <riven@ok.ru>
*/
/*
  NOTE: Conversion of slides is not 100% accurate. Original volume slides
  have effect on carrier volume only. Also, original arpeggio, frequency & volume
  slides use previous effect data instead of current.
*/

#include <cstring>
#include <stdlib.h>
#include <string.h>

#include "cff.h"

/* -------- Public Methods -------------------------------- */

CPlayer *CcffLoader::factory(Copl *newopl)
{
  return new CcffLoader(newopl);
}

bool CcffLoader::load(const std::string &filename, const CFileProvider &fp)
{
  binistream *f = fp.open(filename); if(!f) return false;
  const unsigned char conv_inst[11] = { 2,1,10,9,4,3,6,5,0,8,7 };
  const unsigned short conv_note[12] = { 0x16B, 0x181, 0x198, 0x1B0, 0x1CA, 0x1E5, 0x202, 0x220, 0x241, 0x263, 0x287, 0x2AE };

  int i,j,k,t=0;

  // '<CUD-FM-File>' - signed ?
  f->readString(header.id, 16);
  header.version = f->readInt(1); header.size = f->readInt(2);
  header.packed = f->readInt(1); f->readString((char *)header.reserved, 12);
  if (memcmp(header.id,"<CUD-FM-File>""\x1A\xDE\xE0",16))
    { fp.close(f); return false; }

  unsigned char *module = new unsigned char [0x10000];

  // packed ?
  if (header.packed)
    {
      cff_unpacker *unpacker = new cff_unpacker;

      unsigned char *packed_module = new unsigned char [header.size + 4];

      memset(packed_module,0,header.size + 4);

      f->readString((char *)packed_module, header.size);
      fp.close(f);

      if (!unpacker->unpack(packed_module,module))
	{
	  delete unpacker;
	  delete [] packed_module;
	  delete [] module;
	  return false;
	}

      delete unpacker;
      delete [] packed_module;

      if (memcmp(&module[0x5E1],"CUD-FM-File - SEND A POSTCARD -",31))
	{
	  delete [] module;
	  return false;
	}
    }
  else
    {
      f->readString((char *)module, header.size);
      fp.close(f);
    }

  // init CmodPlayer
  realloc_instruments(47);
  realloc_order(64);
  realloc_patterns(36,64,9);
  init_notetable(conv_note);
  init_trackord();

  // load instruments
  for (i=0;i<47;i++)
    {
      memcpy(&instruments[i],&module[i*32],sizeof(cff_instrument));

      for (j=0;j<11;j++)
	inst[i].data[conv_inst[j]] = instruments[i].data[j];

      instruments[i].name[20] = 0;
    }

  // number of patterns
  nop = module[0x5E0];

  // load title & author
  memcpy(song_title,&module[0x614],20);
  memcpy(song_author,&module[0x600],20);

  // load order
  memcpy(order,&module[0x628],64);

  // load tracks
  for (i=0;i<nop;i++)
    {
      unsigned char old_event_byte2[9];

      memset(old_event_byte2,0,9);

      for (j=0;j<9;j++)
	{
	  for (k=0;k<64;k++)
	    {
	      cff_event *event = (cff_event *)&module[0x669 + ((i*64+k)*9+j)*3];

	      // convert note
	      if (event->byte0 == 0x6D)
		tracks[t][k].note = 127;
	      else
		if (event->byte0)
		  tracks[t][k].note = event->byte0;

	      if (event->byte2)
		old_event_byte2[j] = event->byte2;

	      // convert effect
	      switch (event->byte1)
		{
		case 'I': // set instrument
		  tracks[t][k].inst = event->byte2 + 1;
		  tracks[t][k].param1 = tracks[t][k].param2 = 0;
		  break;

		case 'H': // set tempo
		  tracks[t][k].command = 7;
		  if (event->byte2 < 16)
		    {
		      tracks[t][k].param1 = 0x07;
		      tracks[t][k].param2 = 0x0D;
		    }
		  break;

		case 'A': // set speed
		  tracks[t][k].command = 19;
		  tracks[t][k].param1  = event->byte2 >> 4;
		  tracks[t][k].param2  = event->byte2 & 15;
		  break;

		case 'L': // pattern break
		  tracks[t][k].command = 13;
		  tracks[t][k].param1  = event->byte2 >> 4;
		  tracks[t][k].param2  = event->byte2 & 15;
		  break;

		case 'K': // order jump
		  tracks[t][k].command = 11;
		  tracks[t][k].param1  = event->byte2 >> 4;
		  tracks[t][k].param2  = event->byte2 & 15;
		  break;

		case 'M': // set vibrato/tremolo
		  tracks[t][k].command = 27;
		  tracks[t][k].param1  = event->byte2 >> 4;
		  tracks[t][k].param2  = event->byte2 & 15;
		  break;

		case 'C': // set modulator volume
		  tracks[t][k].command = 21;
		  tracks[t][k].param1 = (0x3F - event->byte2) >> 4;
		  tracks[t][k].param2 = (0x3F - event->byte2) & 15;
		  break;

		case 'G': // set carrier volume
		  tracks[t][k].command = 22;
		  tracks[t][k].param1 = (0x3F - event->byte2) >> 4;
		  tracks[t][k].param2 = (0x3F - event->byte2) & 15;
		  break;

		case 'B': // set carrier waveform
		  tracks[t][k].command = 25;
		  tracks[t][k].param1  = event->byte2;
		  tracks[t][k].param2  = 0x0F;
		  break;

		case 'E': // fine frequency slide down
		  tracks[t][k].command = 24;
		  tracks[t][k].param1  = old_event_byte2[j] >> 4;
		  tracks[t][k].param2  = old_event_byte2[j] & 15;
		  break;

		case 'F': // fine frequency slide up
		  tracks[t][k].command = 23;
		  tracks[t][k].param1  = old_event_byte2[j] >> 4;
		  tracks[t][k].param2  = old_event_byte2[j] & 15;
		  break;

		case 'D': // fine volume slide
		  tracks[t][k].command = 14;
		  if (old_event_byte2[j] & 15)
		    {
		      // slide down
		      tracks[t][k].param1 = 5;
		      tracks[t][k].param2 = old_event_byte2[j] & 15;
		    }
		  else
		    {
		      // slide up
		      tracks[t][k].param1 = 4;
		      tracks[t][k].param2 = old_event_byte2[j] >> 4;
		    }
		  break;

		case 'J': // arpeggio
		  tracks[t][k].param1  = old_event_byte2[j] >> 4;
		  tracks[t][k].param2  = old_event_byte2[j] & 15;
		  break;
		}
	    }

	  t++;
	}
    }

  delete [] module;

  // order loop
  restartpos = 0;

  // order length
  for (i=0;i<64;i++)
    {
      if (order[i] >= 0x80)
	{
	  length = i;
	  break;
	}
    }

  // default tempo
  bpm = 0x7D;

  rewind(0);

  return true;	
}

void CcffLoader::rewind(int subsong)
{
  CmodPlayer::rewind(subsong);

  // default instruments
  for (int i=0;i<9;i++)
    {
      channel[i].inst = i;

      channel[i].vol1 = 63 - (inst[i].data[10] & 63);
      channel[i].vol2 = 63 - (inst[i].data[9] & 63);
    }
}

std::string CcffLoader::gettype()
{
  if (header.packed)
    return std::string("BoomTracker 4, packed");
  else
    return std::string("BoomTracker 4");
}

std::string CcffLoader::gettitle()
{
  return std::string(song_title,20);
}

std::string CcffLoader::getauthor()
{
  return std::string(song_author,20);
}

std::string CcffLoader::getinstrument(unsigned int n)
{
  return std::string(instruments[n].name);
}

unsigned int CcffLoader::getinstruments()
{
  return 47;
}

/* -------- Private Methods ------------------------------- */

#ifdef _WIN32
#pragma warning(disable:4244)
#pragma warning(disable:4018)
#endif

/*
  Lempel-Ziv-Tyr ;-)
*/
long CcffLoader::cff_unpacker::unpack(unsigned char *ibuf, unsigned char *obuf)
{
  if (memcmp(ibuf,"YsComp""\x07""CUD1997""\x1A\x04",16))
    return 0;

  input = ibuf + 16;
  output = obuf;

  output_length = 0;

  heap = (unsigned char *)malloc(0x10000);
  dictionary = (unsigned char **)malloc(sizeof(unsigned char *)*0x8000);

  memset(heap,0,0x10000);
  memset(dictionary,0,0x8000);

  cleanup();
  if(!startup())
    goto out;

  // LZW
  while (1)
    {
      new_code = get_code();

      // 0x00: end of data
      if (new_code == 0)
	break;

      // 0x01: end of block
      if (new_code == 1)
	{
	  cleanup();
	  if(!startup())
	    goto out;

	  continue;
	}

      // 0x02: expand code length
      if (new_code == 2)
	{
	  code_length++;

	  continue;
	}

      // 0x03: RLE
      if (new_code == 3)
	{
	  unsigned char old_code_length = code_length;

	  code_length = 2;

	  unsigned char repeat_length = get_code() + 1;

	  code_length = 4 << get_code();

	  unsigned long repeat_counter = get_code();

	  if(output_length + repeat_counter * repeat_length > 0x10000) {
	    output_length = 0;
	    goto out;
	  }

	  for (unsigned int i=0;i<repeat_counter*repeat_length;i++)
	  {
	    output[output_length] = output[output_length - repeat_length];
	    output_length++;
	  }

	  code_length = old_code_length;

	  if(!startup())
	    goto out;

	  continue;
	}

      if (new_code >= (0x104 + dictionary_length))
	{
	  // dictionary <- old.code.string + old.code.char
	  the_string[++the_string[0]] = the_string[1];
	}
      else
	{
	  // dictionary <- old.code.string + new.code.char
	  unsigned char temp_string[256];

	  translate_code(new_code,temp_string);

	  the_string[++the_string[0]] = temp_string[1];
	}

      expand_dictionary(the_string);

      // output <- new.code.string
      translate_code(new_code,the_string);

      if(output_length + the_string[0] > 0x10000) {
	output_length = 0;
	goto out;
      }

      for (int i=0;i<the_string[0];i++)
	output[output_length++] = the_string[i+1];

      old_code = new_code;
    }

 out:
  free(heap);
  free(dictionary);
  return output_length;
}

unsigned long CcffLoader::cff_unpacker::get_code()
{
  unsigned long code;

  while (bits_left < code_length)
    {
      bits_buffer |= ((*input++) << bits_left);
      bits_left += 8;
    }

  code = bits_buffer & ((1 << code_length) - 1);

  bits_buffer >>= code_length;
  bits_left -= code_length;

  return code;
}

void CcffLoader::cff_unpacker::translate_code(unsigned long code, unsigned char *string)
{
  unsigned char translated_string[256];

  if (code >= 0x104)
    {
      memcpy(translated_string,dictionary[code - 0x104],(*(dictionary[code - 0x104])) + 1);
    }
  else
    {
      translated_string[0] = 1;
      translated_string[1] = (code - 4) & 0xFF;
    }

  memcpy(string,translated_string,256);
}

void CcffLoader::cff_unpacker::cleanup()
{
  code_length = 9;

  bits_buffer = 0;
  bits_left = 0;

  heap_length = 0;
  dictionary_length = 0;
}

int CcffLoader::cff_unpacker::startup()
{
  old_code = get_code();

  translate_code(old_code,the_string);

  if(output_length + the_string[0] > 0x10000) {
    output_length = 0;
    return 0;
  }

  for (int i=0;i<the_string[0];i++)
    output[output_length++] = the_string[i+1];

  return 1;
}

void CcffLoader::cff_unpacker::expand_dictionary(unsigned char *string)
{
  if (string[0] >= 0xF0)
    return;

  memcpy(&heap[heap_length],string,string[0] + 1);

  dictionary[dictionary_length] = &heap[heap_length];

  dictionary_length++;

  heap_length += (string[0] + 1);
}

#ifdef _WIN32
#pragma warning(default:4244)
#pragma warning(default:4018)
#endif
