/* wvWare
 * Copyright (C) Caolan McNamara, Dom Lachowicz, and others
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "wv.h"
#include <glib.h>

/*modify this to handle cbSTSHI < the current size*/
void
wvGetSTSHI (STSHI * item, U16 cbSTSHI, wvStream * fd)
{
    U16 temp16;
    int i;
    U16 count = 0;


    wvInitSTSHI (item);		/* zero any new fields that might not exist in the file */

    item->cstd = read_16ubit (fd);
    count += 2;
    wvTrace (("there are %d std\n", item->cstd));
    item->cbSTDBaseInFile = read_16ubit (fd);
    count += 2;
    temp16 = read_16ubit (fd);
    count += 2;
    item->fStdStylenamesWritten = temp16 & 0x01;
    item->reserved = (temp16 & 0xfe) >> 1;
    item->stiMaxWhenSaved = read_16ubit (fd);
    count += 2;
    item->istdMaxFixedWhenSaved = read_16ubit (fd);
    count += 2;
    item->nVerBuiltInNamesWhenSaved = read_16ubit (fd);
    count += 2;
    for (i = 0; i < 3; i++)
      {
	  item->rgftcStandardChpStsh[i] = read_16ubit (fd);
	  count += 2;
	  if (count >= cbSTSHI)
	      break;
      }

    while (count < cbSTSHI)
      {
	  read_8ubit (fd);
	  count++;
      }
}

void
wvInitSTSHI (STSHI * item)
{
    int i;

    item->cstd = 0;
    item->cbSTDBaseInFile = 0;
    item->fStdStylenamesWritten = 0;
    item->reserved = 0;
    item->stiMaxWhenSaved = 0;
    item->istdMaxFixedWhenSaved = 0;
    item->nVerBuiltInNamesWhenSaved = 0;
    for (i = 0; i < 3; i++)
	item->rgftcStandardChpStsh[i] = 0;
}

void
wvReleaseSTD (STD * item)
{
    U8 i;
    if (!item)
	return;
    wvFree (item->xstzName);

    for (i = 0; i < item->cupx; i++)
      {
	  if (item->grupxf[i].cbUPX == 0)
	      continue;

	  if ((item->cupx == 1) || ((item->cupx == 2) && (i == 1)))
	      wvFree (item->grupxf[i].upx.chpx.grpprl);
	  else if ((item->cupx == 2) && (i == 0))
	      wvFree (item->grupxf[i].upx.papx.grpprl);
      }

    if (item->sgc == sgcChp)
	if (item->grupe)
	    wvReleaseCHPX (&(item->grupe[0].chpx));
    wvFree (item->grupxf);
    wvFree (item->grupe);
}

void
wvInitSTD (STD * item)
{
    item->sti = 0;
    item->fScratch = 0;
    item->fInvalHeight = 0;
    item->fHasUpe = 0;
    item->fMassCopy = 0;
    item->sgc = 0;
    item->istdBase = istdNil;
    item->cupx = 0;
    item->istdNext = 0;
    item->bchUpe = 0;
    item->fAutoRedef = 0;
    item->fHidden = 0;
    item->reserved = 0;
    item->xstzName = NULL;
    item->grupxf = NULL;
    item->grupe = NULL;
}

static const char * wvGetUCS2LEName(void)
{
  char ** p;

  static char * szUCS2LENames[] = {
    "UCS-2LE",			/* preferred */
    "UCS-2-LE",			/* older libiconv */
    "UNICODELITTLE",	        /* older glibc */
    "UTF-16LE",			/* superset */
    "UTF-16-LE",		/* my guess */
    NULL };

  for (p = szUCS2LENames; *p; ++p)
    {
      GIConv g_iconv_handle;
      if ((g_iconv_handle = g_iconv_open("UTF-8",*p)) != (GIConv)-1)
	{
	  g_iconv_close(g_iconv_handle);
	  return *p;
	}
    }

  return NULL;
}

int
wvGetSTD (STD * item, U16 baselen, U16 fixedlen, wvStream * fd)
{
    U16 temp16;
    U16 len, i, j;
    int pos;
    int ret = 0;
    U16 count = 0;
    U32 allocName = 0;		/* length allocated for xstzName */
    GIConv conv = NULL;
	U32 b = 0;

    wvInitSTD (item);		/* zero any new fields that might not exist in the file */

    wvTrace (("baselen set to %d fixed part len is %d\n", baselen, fixedlen));

    temp16 = read_16ubit (fd);
    count += 2;
    item->sti = temp16 & 0x0fff;
    item->fScratch = (temp16 & 0x1000) >> 12;
    item->fInvalHeight = (temp16 & 0x2000) >> 13;
    item->fHasUpe = (temp16 & 0x4000) >> 14;
    item->fMassCopy = (temp16 & 0x8000) >> 15;
    temp16 = read_16ubit (fd);
    count += 2;
    item->sgc = temp16 & 0x000f;
    item->istdBase = (temp16 & 0xfff0) >> 4;
    temp16 = read_16ubit (fd);
    count += 2;
    item->cupx = temp16 & 0x000f;
    item->istdNext = (temp16 & 0xfff0) >> 4;
    item->bchUpe = read_16ubit (fd);
    count += 2;
    if (count < baselen)	/* word 6 has only a count of 8 */
      {
	  temp16 = read_16ubit (fd);
	  count += 2;
	  item->fAutoRedef = temp16 & 0x0001;
	  item->fHidden = (temp16 & 0x0002) >> 1;
	  item->reserved = (temp16 & 0xfffc) >> 2;

	  while (count < baselen)	/* eat any new fields we might know about ourselves */
	    {
		read_8ubit (fd);
		count++;
	    }
      }
    wvTrace (("count is %d, baselen is %d\n", count, baselen));


    pos = 10;


    if (count < 10)
      {
	  ret = 1;
	  len = read_8ubit (fd);
	  pos++;
      }
    else
      {
	  len = read_16ubit (fd);
	  pos += 2;
	  wvTrace (
		   ("%x %x %x %x\n", fixedlen, baselen, fixedlen - baselen,
		    len));
	  if (fixedlen - baselen < len)
	    {
		wvWarning
		    ("The names of the styles are not stored in unicode as is usual for this version, going to 8 bit\n");
		wvStream_offset (fd, -2);
		len = read_8ubit (fd);
		count = 9;	/* to fake the later char reader code */
		pos--;
	    }
      }

    wvTrace (("doing a std, str len is %d\n", len + 1));
    allocName = (len + 1) * sizeof (char);
    item->xstzName = (char *) wvMalloc (allocName);
	*(item->xstzName) = 0;
	b = 0;

    conv = g_iconv_open("utf-8", wvGetUCS2LEName ());

    for (i = 0; i < len + 1; i++)
      {
	  if (count < 10)
	    {
		/* Hub: IMHO we should perform a conversion here */
		item->xstzName[i] = read_8ubit (fd);
		pos++;
	    }
	  else
	    {
		char buf[16];
		char buf2[4];
		char  * tmp;
		char * tmp2;
		size_t insz, sz;
		temp16 = read_16ubit (fd);
		buf2[0] =  temp16 & 0x00ff;
		buf2[1] = (temp16 & 0xff00) >> 8;
		tmp2 = buf2;
		insz = 2 * sizeof(char);
		tmp = buf;
		sz =  sizeof(buf);
		if ((size_t) -1 != g_iconv (conv, &tmp2, &insz, &tmp, &sz)) {
		  while ((b + sizeof(buf) - sz + 1) >= allocName) {
		    allocName *=  2;
		    item->xstzName = (char *) realloc(item->xstzName, allocName);
		  }
		  if (sz) {
		    *tmp = 0;
		  }
		  strncat (item->xstzName, buf, sizeof(buf) - sz);
		  b += (sizeof(buf) - sz);
		  pos += 2;
		}
	    }

	  wvTrace (("sample letter is %c\n", item->xstzName[i]));
      }
    g_iconv_close(conv);
    wvTrace (("string ended\n"));


    wvTrace (("cupx is %d\n", item->cupx));
    if (item->cupx == 0)
      {
	  item->grupxf = NULL;
	  item->grupe = NULL;
	  return (0);
      }

    item->grupxf = (UPXF *) wvMalloc (sizeof (UPXF) * item->cupx);
    if (item->grupxf == NULL)
      {
	  wvError (
		   ("Couuldn't alloc %d bytes for UPXF\n",
		    sizeof (UPXF) * item->cupx));
	  return (0);
      }
    memset (item->grupxf, 0, sizeof (UPXF) * item->cupx);

    item->grupe = (UPE *) wvMalloc (sizeof (UPE) * item->cupx);
    if (item->grupe == NULL)
      {
	  wvError (
		   ("Couuldn't alloc %d bytes for UPE\n",
		    sizeof (UPE) * item->cupx));
	  return (0);
      }
    memset (item->grupe, 0, sizeof (UPE) * item->cupx);

    for (i = 0; i < item->cupx; i++)
      {
	  if ((pos + 1) / 2 != pos / 2)
	    {
		/*eat odd bytes */
		wvStream_offset (fd, 1);
		pos++;
	    }

	  item->grupxf[i].cbUPX = read_16ubit (fd);
	  wvTrace (("cbUPX is %d\n", item->grupxf[i].cbUPX));
	  pos += 2;

	  if (item->grupxf[i].cbUPX == 0)
	      continue;

	  if ((item->cupx == 1) || ((item->cupx == 2) && (i == 1)))
	    {
		item->grupxf[i].upx.chpx.grpprl =
		    (U8 *) wvMalloc (item->grupxf[i].cbUPX);
		for (j = 0; j < item->grupxf[i].cbUPX; j++)
		  {
		      item->grupxf[i].upx.chpx.grpprl[j] = read_8ubit (fd);
		      pos++;
		  }
	    }
	  else if ((item->cupx == 2) && (i == 0))
	    {
		item->grupxf[i].upx.papx.istd = read_16ubit (fd);
		pos += 2;
		if (item->grupxf[i].cbUPX - 2)
		    item->grupxf[i].upx.papx.grpprl =
			(U8 *) wvMalloc (item->grupxf[i].cbUPX - 2);
		else
		    item->grupxf[i].upx.papx.grpprl = NULL;
		for (j = 0; j < item->grupxf[i].cbUPX - 2; j++)
		  {
		      item->grupxf[i].upx.papx.grpprl[j] = read_8ubit (fd);
		      pos++;
		  }
	    }
	  else
	    {
		wvTrace (("Strange cupx option\n"));
		wvStream_offset (fd, item->grupxf[i].cbUPX);
		pos += item->grupxf[i].cbUPX;
	    }
      }



    /*eat odd bytes */
    if ((pos + 1) / 2 != pos / 2)
	wvStream_offset (fd, 1);
    return (ret);
}

void
wvReleaseSTSH (STSH * item)
{
    int i;
    for (i = 0; i < item->Stshi.cstd; i++)
      {
	  wvTrace (("Releasing %d std\n", i));
	  wvReleaseSTD (&(item->std[i]));
      }
    wvFree (item->std);
}

void
wvGetSTSH (STSH * item, U32 offset, U32 len, wvStream * fd)
{
    U16 cbStshi, cbStd, i, word6 = 0, j;
    U16 *chains1;
    U16 *chains2;
    if (len == 0)
      {
	  item->Stshi.cstd = 0;
	  item->std = NULL;
	  return;
      }
    wvTrace (("stsh offset len is %x %d\n", offset, len));
    wvStream_goto (fd, offset);
    cbStshi = read_16ubit (fd);
    wvGetSTSHI (&(item->Stshi), cbStshi, fd);

    if (item->Stshi.cstd == 0)
      {
	  item->std = NULL;
	  return;
      }
    chains1 = (U16 *) wvMalloc (sizeof (U16) * item->Stshi.cstd);
    chains2 = (U16 *) wvMalloc (sizeof (U16) * item->Stshi.cstd);

    item->std = (STD *) wvMalloc (sizeof (STD) * item->Stshi.cstd);
    if (item->std == NULL)
      {
	  wvError (
		   ("No mem for STD list, of size %d\n",
		    sizeof (STD) * item->Stshi.cstd));
	  return;
      }

    for (i = 0; i < item->Stshi.cstd; i++)
	wvInitSTD (&(item->std[i]));

    for (i = 0; i < item->Stshi.cstd; i++)
      {
	  cbStd = read_16ubit (fd);
	  wvTrace (
		   ("index is %d,cbStd is %d, should end on %x\n", i, cbStd,
		    wvStream_tell (fd) + cbStd));
	  if (cbStd != 0)
	    {
		word6 =
		    wvGetSTD (&(item->std[i]), item->Stshi.cbSTDBaseInFile,
			      cbStd, fd);
		wvTrace (
			 ("istdBase is %d, type is %d, 6|8 version is %d\n",
			  item->std[i].istdBase, item->std[i].sgc, word6));
	    }
	  wvTrace (("actually ended on %x\n", wvStream_tell (fd)));
	  chains1[i] = item->std[i].istdBase;
      }


    /* 
       we will do number 10, (standard character style) first if possible, 
       some evil word docs attempt illegally to use sprmCBold etc with a 
       128 and 129 argument, which is supposedly not allowed, but happens
       anyway. In all examples so far it has been character style no 10 that
       they have attempted to access
     */
    if (item->std[10].istdBase == istdNil)
      {
	  wvTrace (("Generating istd no %d\n", i));
	  wvGenerateStyle (item, 10, word6);
      }
    for (i = 0; i < item->Stshi.cstd; i++)
      {
	  if ((item->std[i].istdBase == istdNil) && (i != 10))
	    {
		wvTrace (("Generating istd no %d\n", i));
		wvGenerateStyle (item, i, word6);
	    }
	  wvTrace (("1: No %d,Base is %d\n", i, chains1[i]));
      }

    j = 0;
    while (j < 11)
      {
	  int finished = 1;
	  for (i = 0; i < item->Stshi.cstd; i++)
	    {
		if ((chains1[i] != istdNil) && (chains1[chains1[i]] == istdNil))
		  {
		      chains2[i] = istdNil;
		      wvTrace (("Generating istd no %d\n", i));
		      wvGenerateStyle (item, i, word6);
		      finished = 0;
		  }
		else
		    chains2[i] = chains1[i];
		wvTrace (("%d: No %d, Base is %d\n", j, i, chains2[i]));
	    }
	  for (i = 0; i < item->Stshi.cstd; i++)
	      chains1[i] = chains2[i];
	  if (finished)
	      break;
	  j++;
      }

    wvFree (chains1);
    wvFree (chains2);
}


void
wvGenerateStyle (STSH * item, U16 i, U16 word6)
{
    if (item->std[i].cupx == 0)
      {
	  wvTrace (("Empty Slot %d\n", i));
	  return;
      }

    switch (item->std[i].sgc)
      {
      case sgcPara:
	  wvTrace (
		   ("doing paragraph, len is %d\n",
		    item->std[i].grupxf[0].cbUPX));
	  
	  if (item->std[i].cupx > 1) 
	  {
	    wvTrace (
		   ("doing paragraph, len is %d\n",
		    item->std[i].grupxf[1].cbUPX));
	  }
	  
	  wvInitPAPFromIstd (&(item->std[i].grupe[0].apap),
			     (U16) item->std[i].istdBase, item);
	  if (word6)
	      wvAddPAPXFromBucket6 (&(item->std[i].grupe[0].apap),
				    &(item->std[i].grupxf[0]), item);
	  else
	      wvAddPAPXFromBucket (&(item->std[i].grupe[0].apap),
				   &(item->std[i].grupxf[0]), item, NULL);
	  /* data is NULL because HugePAPX cannot occur in this circumstance, according to the
	     docs */

	  /* if cupx <=1, there is not grupe[1] or grupxf[1] to access */
	  if (item->std[i].cupx <= 1)
	    { 
	      wvWarning("cupx <=1. we better stop here."); 
	      break;
	    }

	  wvInitCHPFromIstd (&(item->std[i].grupe[1].achp),
			     (U16) item->std[i].istdBase, item);

	  wvTrace (("here1\n"));

	  if (word6)
	      wvAddCHPXFromBucket6 (&(item->std[i].grupe[1].achp),
				    &(item->std[i].grupxf[1]), item);
	  else
	      wvAddCHPXFromBucket (&(item->std[i].grupe[1].achp),
				   &(item->std[i].grupxf[1]), item);

	  wvTrace (("here2\n"));

	  if (item->std[i].grupe[1].achp.istd != istdNormalChar)
	    {
		wvWarning
		    ("chp should have had istd set to istdNormalChar, doing it manually\n");
		item->std[i].grupe[1].achp.istd = istdNormalChar;
	    }

	  break;
      case sgcChp:
	  wvInitCHPXFromIstd (&(item->std[i].grupe[0].chpx),
			      (U16) item->std[i].istdBase, item);

	  if (word6)
	      wvUpdateCHPXBucket (&(item->std[i].grupxf[0]));

	  wvMergeCHPXFromBucket (&(item->std[i].grupe[0].chpx),
				 &(item->std[i].grupxf[0]));
	  /* UPE.chpx.istd is set to the style's istd */
	  item->std[i].grupe[0].chpx.istd = i;	/*? */
	  break;
      default:
	  wvWarning ("New document type\n");
	  break;
      }
}