kc3-lang/harfbuzz/util/options-subset.cc

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• Hash : b2a965df
  Author :
  Date : 2020-04-22T15:58:41
  

  [subset] Add support for "--gids" option
  cmap subsetting now retains entries associated with any glyph ids explicitly requested
  

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• util/options-subset.cc

• /*
   * Copyright © 2019  Google, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Google Author(s): Garret Rieger
   */
  
  #include "options.hh"
  
  #include "hb-subset-input.hh"
  
  static gboolean
  parse_gids (const char *name G_GNUC_UNUSED,
  	    const char *arg,
  	    gpointer    data,
  	    GError    **error G_GNUC_UNUSED)
  {
    subset_options_t *subset_opts = (subset_options_t *) data;
    hb_set_t *gids = subset_opts->input->glyphs;
  
    char *s = (char *) arg;
    char *p;
  
    while (s && *s)
    {
      while (*s && strchr (", ", *s))
        s++;
      if (!*s)
        break;
  
      errno = 0;
      hb_codepoint_t start_code = strtoul (s, &p, 10);
      if (s[0] == '-' || errno || s == p)
      {
        hb_set_destroy (gids);
        g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
                     "Failed parsing gids values at: '%s'", s);
        return false;
      }
  
      if (p && p[0] == '-') //gid ranges
      {
        s = ++p;
        hb_codepoint_t end_code = strtoul (s, &p, 10);
        if (s[0] == '-' || errno || s == p)
        {
          hb_set_destroy (gids);
          g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
                       "Failed parsing gids values at: '%s'", s);
          return false;
        }
  
        if (end_code < start_code)
        {
          hb_set_destroy (gids);
          g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
                       "Invalid gids range value %u-%u", start_code, end_code);
          return false;
        }
        hb_set_add_range (gids, start_code, end_code);
      }
      else
      {
        hb_set_add (gids, start_code);
      }
      s = p;
    }
  
    return true;
  }
  
  static gboolean
  parse_nameids (const char *name,
  	       const char *arg,
  	       gpointer    data,
  	       GError    **error G_GNUC_UNUSED)
  {
    subset_options_t *subset_opts = (subset_options_t *) data;
    hb_set_t *name_ids = subset_opts->input->name_ids;
  
    char last_name_char = name[strlen (name) - 1];
  
    if (last_name_char != '+' && last_name_char != '-')
      hb_set_clear (name_ids);
  
    if (0 == strcmp (arg, "*"))
    {
      if (last_name_char == '-')
        hb_set_del_range (name_ids, 0, 0x7FFF);
      else
        hb_set_add_range (name_ids, 0, 0x7FFF);
      return true;
    }
  
    char *s = (char *) arg;
    char *p;
  
    while (s && *s)
    {
      while (*s && strchr (", ", *s))
        s++;
      if (!*s)
        break;
  
      errno = 0;
      hb_codepoint_t u = strtoul (s, &p, 10);
      if (errno || s == p)
      {
        hb_set_destroy (name_ids);
        g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
  		   "Failed parsing nameID values at: '%s'", s);
        return false;
      }
  
      if (last_name_char != '-')
      {
        hb_set_add (name_ids, u);
      } else {
        hb_set_del (name_ids, u);
      }
  
      s = p;
    }
  
    return true;
  }
  
  static gboolean
  parse_name_languages (const char *name,
  		      const char *arg,
  		      gpointer    data,
  		      GError    **error G_GNUC_UNUSED)
  {
    subset_options_t *subset_opts = (subset_options_t *) data;
    hb_set_t *name_languages = subset_opts->input->name_languages;
  
    char last_name_char = name[strlen (name) - 1];
  
    if (last_name_char != '+' && last_name_char != '-')
      hb_set_clear (name_languages);
  
    if (0 == strcmp (arg, "*"))
    {
      if (last_name_char == '-')
        hb_set_del_range (name_languages, 0, 0x5FFF);
      else
        hb_set_add_range (name_languages, 0, 0x5FFF);
      return true;
    }
  
    char *s = (char *) arg;
    char *p;
  
    while (s && *s)
    {
      while (*s && strchr (", ", *s))
        s++;
      if (!*s)
        break;
  
      errno = 0;
      hb_codepoint_t u = strtoul (s, &p, 10);
      if (errno || s == p)
      {
        hb_set_destroy (name_languages);
        g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
  		   "Failed parsing name_languages values at: '%s'", s);
        return false;
      }
  
      if (last_name_char != '-')
      {
        hb_set_add (name_languages, u);
      } else {
        hb_set_del (name_languages, u);
      }
  
      s = p;
    }
  
    return true;
  }
  
  static gboolean
  parse_drop_tables (const char *name,
  		   const char *arg,
  		   gpointer    data,
  		   GError    **error G_GNUC_UNUSED)
  {
    subset_options_t *subset_opts = (subset_options_t *) data;
    hb_set_t *drop_tables = subset_opts->input->drop_tables;
  
    char last_name_char = name[strlen (name) - 1];
  
    if (last_name_char != '+' && last_name_char != '-')
      hb_set_clear (drop_tables);
  
    char *s = strtok((char *) arg, ", ");
    while (s)
    {
      if (strlen (s) > 4) // Table tags are at most 4 bytes.
      {
        g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
  		   "Failed parsing table tag values at: '%s'", s);
        return false;
      }
  
      hb_tag_t tag = hb_tag_from_string (s, strlen (s));
  
      if (last_name_char != '-')
        hb_set_add (drop_tables, tag);
      else
        hb_set_del (drop_tables, tag);
  
      s = strtok(nullptr, ", ");
    }
  
    return true;
  }
  
  void
  subset_options_t::add_options (option_parser_t *parser)
  {
    GOptionEntry entries[] =
    {
      {"no-hinting", 0, 0, G_OPTION_ARG_NONE,  &this->input->drop_hints,   "Whether to drop hints",   nullptr},
      {"retain-gids", 0, 0, G_OPTION_ARG_NONE,  &this->input->retain_gids,   "If set don't renumber glyph ids in the subset.",   nullptr},
      {"gids", 0, 0, G_OPTION_ARG_CALLBACK,  (gpointer) &parse_gids,  "Specify glyph IDs or ranges to include in the subset", "list of comma/whitespace-separated int numbers or ranges"},
      {"desubroutinize", 0, 0, G_OPTION_ARG_NONE,  &this->input->desubroutinize,   "Remove CFF/CFF2 use of subroutines",   nullptr},
      {"name-IDs", 0, 0, G_OPTION_ARG_CALLBACK,  (gpointer) &parse_nameids,  "Subset specified nameids", "list of int numbers"},
      {"name-legacy", 0, 0, G_OPTION_ARG_NONE,  &this->input->name_legacy,   "Keep legacy (non-Unicode) 'name' table entries",   nullptr},
      {"name-languages", 0, 0, G_OPTION_ARG_CALLBACK,  (gpointer) &parse_name_languages,  "Subset nameRecords with specified language IDs", "list of int numbers"},
      {"drop-tables", 0, 0, G_OPTION_ARG_CALLBACK,  (gpointer) &parse_drop_tables,  "Drop the specified tables.", "list of string table tags."},
      {"drop-tables+", 0, 0, G_OPTION_ARG_CALLBACK,  (gpointer) &parse_drop_tables,  "Drop the specified tables.", "list of string table tags."},
      {"drop-tables-", 0, 0, G_OPTION_ARG_CALLBACK,  (gpointer) &parse_drop_tables,  "Drop the specified tables.", "list of string table tags."},
  
      {nullptr}
    };
    parser->add_group (entries,
  	 "subset",
  	 "Subset options:",
  	 "Options subsetting",
  	 this);
  }
  

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