/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.

    Copyright (C) 2002-2019 by Jin-Hwan Cho and Shunsaku Hirata,
    the dvipdfmx project team.

    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.
*/

#include "dpx-tt_table.h"

#include <stdio.h>

#include "tectonic_bridge_core.h"
#include "dpx-error.h"
#include "dpx-mem.h"
#include "dpx-sfnt.h"

/*
  tables contains information refered by other tables
  maxp->numGlyphs, etc --> loca, etc
  hhea->numOfLongHorMetrics --> hmtx
  head->indexToLocFormat --> loca
  head->glyphDataFormat --> glyf
*/

char *tt_pack_head_table (struct tt_head_table *table)
{
  int i;
  char *p, *data;

  if (table == NULL)
    _tt_abort("passed NULL pointer\n");

  p = data = NEW(TT_HEAD_TABLE_SIZE, char);
  p += sfnt_put_ulong(p, table->version);
  p += sfnt_put_ulong(p, table->fontRevision);
  p += sfnt_put_ulong(p, table->checkSumAdjustment);
  p += sfnt_put_ulong(p, table->magicNumber);
  p += sfnt_put_ushort(p, table->flags);
  p += sfnt_put_ushort(p, table->unitsPerEm);
  for (i=0; i<8; i++) {
    *(p++) = (table->created)[i];
  }
  for (i=0; i<8; i++) {
    *(p++) = (table->modified)[i];
  }
  p += sfnt_put_short(p, table->xMin);
  p += sfnt_put_short(p, table->yMin);
  p += sfnt_put_short(p, table->xMax);
  p += sfnt_put_short(p, table->yMax);
  p += sfnt_put_ushort(p, table->macStyle);
  p += sfnt_put_ushort(p, table->lowestRecPPEM);
  p += sfnt_put_short(p, table->fontDirectionHint);
  p += sfnt_put_short(p, table->indexToLocFormat);
  p += sfnt_put_short(p, table->glyphDataFormat);

  return data;
}

struct tt_head_table *tt_read_head_table (sfnt *sfont)
{
  int i;
  struct tt_head_table *table = NEW(1, struct tt_head_table);

  sfnt_locate_table(sfont, "head");

  table->version = sfnt_get_ulong(sfont);
  table->fontRevision = sfnt_get_ulong(sfont);
  table->checkSumAdjustment = sfnt_get_ulong(sfont);
  table->magicNumber = sfnt_get_ulong(sfont);
  table->flags = sfnt_get_ushort(sfont);
  table->unitsPerEm = sfnt_get_ushort(sfont);
  for (i=0; i<8; i++) {
    (table->created)[i] = sfnt_get_byte (sfont);
  }
  for (i=0; i<8; i++) {
    (table->modified)[i] = sfnt_get_byte (sfont);
  }
  table->xMin = sfnt_get_short(sfont);
  table->yMin = sfnt_get_short(sfont);
  table->xMax = sfnt_get_short(sfont);
  table->yMax = sfnt_get_short(sfont);
  table->macStyle = sfnt_get_short(sfont);
  table->lowestRecPPEM = sfnt_get_short(sfont);
  table->fontDirectionHint = sfnt_get_short(sfont);
  table->indexToLocFormat = sfnt_get_short(sfont);
  table->glyphDataFormat = sfnt_get_short(sfont);

  return table;
}

char *tt_pack_maxp_table (struct tt_maxp_table *table)
{
  char *p, *data;

  p = data = NEW(TT_MAXP_TABLE_SIZE, char);
  p += sfnt_put_ulong(p, table->version);
  p += sfnt_put_ushort(p, table->numGlyphs);
  p += sfnt_put_ushort(p, table->maxPoints);
  p += sfnt_put_ushort(p, table->maxContours);
  p += sfnt_put_ushort(p, table->maxComponentPoints);
  p += sfnt_put_ushort(p, table->maxComponentContours);
  p += sfnt_put_ushort(p, table->maxZones);
  p += sfnt_put_ushort(p, table->maxTwilightPoints);
  p += sfnt_put_ushort(p, table->maxStorage);
  p += sfnt_put_ushort(p, table->maxFunctionDefs);
  p += sfnt_put_ushort(p, table->maxInstructionDefs);
  p += sfnt_put_ushort(p, table->maxStackElements);
  p += sfnt_put_ushort(p, table->maxSizeOfInstructions);
  p += sfnt_put_ushort(p, table->maxComponentElements);
  p += sfnt_put_ushort(p, table->maxComponentDepth);

  return data;
}

struct tt_maxp_table *tt_read_maxp_table (sfnt *sfont)
{
  struct tt_maxp_table *table = NEW(1, struct tt_maxp_table);

  sfnt_locate_table(sfont, "maxp");

  table->version = sfnt_get_ulong(sfont);
  table->numGlyphs = sfnt_get_ushort(sfont);
  table->maxPoints = sfnt_get_ushort(sfont);
  table->maxContours = sfnt_get_ushort(sfont);
  table->maxComponentPoints = sfnt_get_ushort(sfont);
  table->maxComponentContours = sfnt_get_ushort(sfont);
  table->maxZones = sfnt_get_ushort(sfont);
  table->maxTwilightPoints = sfnt_get_ushort(sfont);
  table->maxStorage = sfnt_get_ushort(sfont);
  table->maxFunctionDefs = sfnt_get_ushort(sfont);
  table->maxInstructionDefs = sfnt_get_ushort(sfont);
  table->maxStackElements = sfnt_get_ushort(sfont);
  table->maxSizeOfInstructions = sfnt_get_ushort(sfont);
  table->maxComponentElements = sfnt_get_ushort(sfont);
  table->maxComponentDepth = sfnt_get_ushort(sfont);

  return table;
}

char *tt_pack_hhea_table (struct tt_hhea_table *table)
{
  int   i;
  char *p, *data;

  p  = data = NEW(TT_HHEA_TABLE_SIZE, char);
  p += sfnt_put_ulong(p, table->version);
  p += sfnt_put_short(p, table->ascent);
  p += sfnt_put_short(p, table->descent);
  p += sfnt_put_short(p, table->lineGap);
  p += sfnt_put_ushort(p, table->advanceWidthMax);
  p += sfnt_put_short(p, table->minLeftSideBearing);
  p += sfnt_put_short(p, table->minRightSideBearing);
  p += sfnt_put_short(p, table->xMaxExtent);
  p += sfnt_put_short(p, table->caretSlopeRise);
  p += sfnt_put_short(p, table->caretSlopeRun);
  p += sfnt_put_short(p, table->caretOffset);
  for (i = 0; i < 4; i++) {
    p += sfnt_put_short(p, table->reserved[i]);
  }
  p += sfnt_put_short(p, table->metricDataFormat);
  p += sfnt_put_ushort(p, table->numOfLongHorMetrics);

  return data;
}

struct tt_hhea_table *
tt_read_hhea_table (sfnt *sfont)
{
  int    i;
  ULONG  len;
  struct tt_hhea_table *table = NEW(1, struct tt_hhea_table);

  sfnt_locate_table(sfont, "hhea");

  table->version = sfnt_get_ulong(sfont);
  table->ascent  = sfnt_get_short (sfont);
  table->descent = sfnt_get_short(sfont);
  table->lineGap = sfnt_get_short(sfont);
  table->advanceWidthMax     = sfnt_get_ushort(sfont);
  table->minLeftSideBearing  = sfnt_get_short(sfont);
  table->minRightSideBearing = sfnt_get_short(sfont);
  table->xMaxExtent     = sfnt_get_short(sfont);
  table->caretSlopeRise = sfnt_get_short(sfont);
  table->caretSlopeRun  = sfnt_get_short(sfont);
  table->caretOffset    = sfnt_get_short(sfont);
  for(i = 0; i < 4; i++) {
    table->reserved[i] = sfnt_get_short(sfont);
  }
  table->metricDataFormat = sfnt_get_short(sfont);
  if (table->metricDataFormat != 0)
    _tt_abort("unknown metricDataFormat");
  table->numOfLongHorMetrics = sfnt_get_ushort(sfont);

  len = sfnt_find_table_len(sfont, "hmtx");
  table->numOfExSideBearings = (USHORT)((len - table->numOfLongHorMetrics * 4) / 2);

  return table;
}

/* vhea */
struct tt_vhea_table *tt_read_vhea_table (sfnt *sfont)
{
  int   i;
  ULONG len;
  struct tt_vhea_table *table = NEW(1, struct tt_vhea_table);

  sfnt_locate_table(sfont, "vhea");

  table->version = sfnt_get_ulong(sfont);
  table->vertTypoAscender = sfnt_get_short (sfont);
  table->vertTypoDescender = sfnt_get_short(sfont);
  table->vertTypoLineGap = sfnt_get_short(sfont);
  table->advanceHeightMax = sfnt_get_short(sfont); /* ushort ? */
  table->minTopSideBearing = sfnt_get_short(sfont);
  table->minBottomSideBearing = sfnt_get_short(sfont);
  table->yMaxExtent = sfnt_get_short(sfont);
  table->caretSlopeRise = sfnt_get_short(sfont);
  table->caretSlopeRun = sfnt_get_short(sfont);
  table->caretOffset = sfnt_get_short(sfont);
  for(i = 0; i < 4; i++) {
    (table->reserved)[i] = sfnt_get_short(sfont);
  }
  table->metricDataFormat = sfnt_get_short(sfont);
  table->numOfLongVerMetrics = sfnt_get_ushort(sfont);

  len = sfnt_find_table_len(sfont, "vmtx");
  table->numOfExSideBearings = (USHORT)((len - table->numOfLongVerMetrics * 4) / 2);

  return table;
}


struct tt_VORG_table *
tt_read_VORG_table (sfnt *sfont)
{
  struct tt_VORG_table *vorg;
  ULONG  offset;
  USHORT i;

  offset = sfnt_find_table_pos(sfont, "VORG");

  if (offset > 0) {
    vorg = NEW(1, struct tt_VORG_table);

    sfnt_locate_table(sfont, "VORG");
    if (sfnt_get_ushort(sfont) != 1 ||
        sfnt_get_ushort(sfont) != 0)
      _tt_abort("Unsupported VORG version.");

    vorg->defaultVertOriginY    = sfnt_get_short(sfont);
    vorg->numVertOriginYMetrics = sfnt_get_ushort(sfont);
    vorg->vertOriginYMetrics    = NEW(vorg->numVertOriginYMetrics,
                                      struct tt_vertOriginYMetrics);
    /*
     * The vertOriginYMetrics array must be sorted in increasing
     * glyphIndex order.
     */
    for (i = 0;
         i < vorg->numVertOriginYMetrics; i++) {
      vorg->vertOriginYMetrics[i].glyphIndex  = sfnt_get_ushort(sfont);
      vorg->vertOriginYMetrics[i].vertOriginY = sfnt_get_short(sfont);
    }
  } else {
    vorg = NULL;
  }

  return vorg;
}

/*
 * hmtx and vmtx
 *
 *  Reading/writing hmtx and vmtx depend on other tables, maxp and hhea/vhea.
 */

struct tt_longMetrics *
tt_read_longMetrics (sfnt *sfont, USHORT numGlyphs, USHORT numLongMetrics, USHORT numExSideBearings)
{
  struct tt_longMetrics *m;
  USHORT gid, last_adv = 0;
  SHORT  last_esb = 0;

  m = NEW(numGlyphs, struct tt_longMetrics);
  for (gid = 0; gid < numGlyphs; gid++) {
    if (gid < numLongMetrics)
      last_adv = sfnt_get_ushort(sfont);
    if (gid < numLongMetrics + numExSideBearings)
      last_esb = sfnt_get_short(sfont);
    m[gid].advance     = last_adv;
    m[gid].sideBearing = last_esb;
  }

  return m;
}

/* OS/2 table */
/* this table may not exist */
struct tt_os2__table *
tt_read_os2__table (sfnt *sfont)
{
  struct tt_os2__table *table = NULL;
  int    i;

  table = NEW(1, struct tt_os2__table);

  if (sfnt_find_table_pos(sfont, "OS/2") > 0) {
    sfnt_locate_table(sfont, "OS/2");
    table->version       = sfnt_get_ushort(sfont);
    table->xAvgCharWidth = sfnt_get_short(sfont);
    table->usWeightClass = sfnt_get_ushort(sfont);
    table->usWidthClass  = sfnt_get_ushort(sfont);
    table->fsType        = sfnt_get_short(sfont);
    table->ySubscriptXSize   = sfnt_get_short(sfont);
    table->ySubscriptYSize   = sfnt_get_short(sfont);
    table->ySubscriptXOffset = sfnt_get_short(sfont);
    table->ySubscriptYOffset = sfnt_get_short(sfont);
    table->ySuperscriptXSize = sfnt_get_short(sfont);
    table->ySuperscriptYSize = sfnt_get_short(sfont);
    table->ySuperscriptXOffset = sfnt_get_short(sfont);
    table->ySuperscriptYOffset = sfnt_get_short(sfont);
    table->yStrikeoutSize      = sfnt_get_short(sfont);
    table->yStrikeoutPosition  = sfnt_get_short(sfont);
    table->sFamilyClass        = sfnt_get_short(sfont);
    for (i = 0; i < 10; i++) {
      table->panose[i] = sfnt_get_byte(sfont);
    }
    table->ulUnicodeRange1 = sfnt_get_ulong(sfont);
    table->ulUnicodeRange2 = sfnt_get_ulong(sfont);
    table->ulUnicodeRange3 = sfnt_get_ulong(sfont);
    table->ulUnicodeRange4 = sfnt_get_ulong(sfont);
    for (i = 0; i < 4; i++) {
      table->achVendID[i] = sfnt_get_char(sfont);
    }
    table->fsSelection      = sfnt_get_ushort(sfont);
    table->usFirstCharIndex = sfnt_get_ushort(sfont);
    table->usLastCharIndex  = sfnt_get_ushort(sfont);
    if (sfnt_find_table_len(sfont, "OS/2") >= 78) {
      /* these fields are not present in the original Apple spec (68-byte table),
         but Microsoft's version of "format 0" does include them... grr! */
      table->sTypoAscender    = sfnt_get_short(sfont);
      table->sTypoDescender   = sfnt_get_short(sfont);
      table->sTypoLineGap     = sfnt_get_short(sfont);
      table->usWinAscent      = sfnt_get_ushort(sfont);
      table->usWinDescent     = sfnt_get_ushort(sfont);
      if (table->version > 0) {
        /* format 1 adds the following 2 fields */
        table->ulCodePageRange1 = sfnt_get_ulong(sfont);
        table->ulCodePageRange2 = sfnt_get_ulong(sfont);
        if (table->version > 1) {
          /* and formats 2 and 3 (current) include 5 more.... these share the
             same fields, only the precise definition of some was changed */
          table->sxHeight      = sfnt_get_short(sfont);
          table->sCapHeight    = sfnt_get_short(sfont);
          table->usDefaultChar = sfnt_get_ushort(sfont);
          table->usBreakChar   = sfnt_get_ushort(sfont);
          table->usMaxContext  = sfnt_get_ushort(sfont);
        }
      }
    }
  } else {

    /* used in add_CIDVMetrics() of cidtype0.c */
    table->sTypoAscender  = 880;
    table->sTypoDescender = -120;
    /* used in tt_get_fontdesc() of tt_aux.c */
    table->usWeightClass = 400U; /* Normal(Regular) */
    table->xAvgCharWidth = 0; /* ignore */
    table->version = 0; /* TrueType rev 1.5 */
    table->fsType = 0; /* Installable Embedding */
    table->fsSelection = 0U; /* All undefined */
    table->sFamilyClass = 0; /* No Classification */
    for (i = 0; i < 10; i++) {
      table->panose[i] = 0; /* All Any */
    }
  }

  return table;
}

static USHORT
tt_get_name (sfnt *sfont, char *dest, USHORT destlen,
             USHORT plat_id, USHORT enco_id,
             USHORT lang_id, USHORT name_id)
{
  USHORT length = 0;
  USHORT num_names, string_offset;
  ULONG  name_offset;
  int    i, j;
  int    is_utf16_be;

  name_offset = sfnt_locate_table (sfont, "name");
  is_utf16_be = (plat_id == 3) && (enco_id == 1) &&
                (lang_id == 0x0409u) && (name_id == 6);

  if (sfnt_get_ushort(sfont))
    _tt_abort("Expecting zero");

  num_names = sfnt_get_ushort(sfont);
  string_offset = sfnt_get_ushort(sfont);
  for (i=0;i<num_names;i++) {
    USHORT p_id, e_id, n_id, l_id;
    USHORT offset;

    p_id = sfnt_get_ushort(sfont);
    e_id = sfnt_get_ushort(sfont);
    l_id = sfnt_get_ushort(sfont);
    n_id = sfnt_get_ushort(sfont);
    length = sfnt_get_ushort(sfont);
    offset = sfnt_get_ushort(sfont);
    /* language ID value 0xffffu for `accept any language ID' */
    if ((p_id == plat_id) && (e_id == enco_id) &&
        (lang_id == 0xffffu || l_id == lang_id) && (n_id == name_id)) {
      if (is_utf16_be) {
         length /= 2;
      }
      if (length > destlen - 1) {
        dpx_warning("Name string too long (%u), truncating to %u", length, destlen);
        length = destlen - 1;
      }
      sfnt_seek_set (sfont, name_offset+string_offset+offset);
      if (is_utf16_be) {
        for (j=0;j<length;j++) {
          dest[j] = (unsigned char)(sfnt_get_ushort(sfont) & 0x00FF);
        }
      }
      else {
        sfnt_read((unsigned char*)dest, length, sfont);
      }
      dest[length] = '\0';
      break;
    }
  }
  if (i == num_names) {
    length = 0;
  }

  return length;
}

USHORT
tt_get_ps_fontname (sfnt *sfont, char *dest, USHORT destlen)
{
  USHORT namelen = 0;

  /* First try Mac-Roman PS name and then Win-Unicode PS name */
  if ((namelen = tt_get_name(sfont, dest, destlen, 1, 0, 0, 6)) != 0 ||
      (namelen = tt_get_name(sfont, dest, destlen, 3, 1, 0x409u, 6)) != 0 ||
      (namelen = tt_get_name(sfont, dest, destlen, 3, 5, 0x412u, 6)) != 0)
    return namelen;

  dpx_warning("No valid PostScript name available");
  /*
    Workaround for some bad TTfonts:
    Language ID value 0xffffu for `accept any language ID'
  */
  if ((namelen = tt_get_name(sfont, dest, destlen, 1, 0, 0xffffu, 6)) == 0) {
    /*
      Finally falling back to Mac Roman name field.
      Warning: Some bad Japanese TTfonts using SJIS encoded string in the
      Mac Roman name field.
    */
    namelen = tt_get_name(sfont, dest, destlen, 1, 0, 0, 1);
  }

  return namelen;
}