hb-ot-name.cc

Go to the documentation of this file.

/*
 * Copyright © 2018  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): Behdad Esfahbod
 */
 
#include "hb.hh"
 
#ifndef HB_NO_NAME
 
#include "hb-ot-name-table.hh"
 
#include "hb-utf.hh"
 
 
const hb_ot_name_entry_t *
hb_ot_name_list_names (hb_face_t    *face,
               unsigned int *num_entries /* OUT */)
{
  const OT::name_accelerator_t &name = *face->table.name;
  if (num_entries) *num_entries = name.names.length;
  return (const hb_ot_name_entry_t *) name.names;
}
 
 
template <typename in_utf_t, typename out_utf_t>
static inline unsigned int
hb_ot_name_convert_utf (hb_bytes_t                       bytes,
            unsigned int                    *text_size /* IN/OUT */,
            typename out_utf_t::codepoint_t *text /* OUT */)
{
  unsigned int src_len = bytes.length / sizeof (typename in_utf_t::codepoint_t);
  const typename in_utf_t::codepoint_t *src = (const typename in_utf_t::codepoint_t *) bytes.arrayZ;
  const typename in_utf_t::codepoint_t *src_end = src + src_len;
 
  typename out_utf_t::codepoint_t *dst = text;
 
  hb_codepoint_t unicode;
  const hb_codepoint_t replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
 
  if (text_size && *text_size)
  {
    (*text_size)--; /* Same room for NUL-termination. */
    const typename out_utf_t::codepoint_t *dst_end = text + *text_size;
 
    while (src < src_end && dst < dst_end)
    {
      const typename in_utf_t::codepoint_t *src_next = in_utf_t::next (src, src_end, &unicode, replacement);
      typename out_utf_t::codepoint_t *dst_next = out_utf_t::encode (dst, dst_end, unicode);
      if (dst_next == dst)
    break; /* Out-of-room. */
 
      dst = dst_next;
      src = src_next;
    }
 
    *text_size = dst - text;
    *dst = 0; /* NUL-terminate. */
  }
 
  /* Accumulate length of rest. */
  unsigned int dst_len = dst - text;
  while (src < src_end)
  {
    src = in_utf_t::next (src, src_end, &unicode, replacement);
    dst_len += out_utf_t::encode_len (unicode);
  }
  return dst_len;
}
 
template <typename utf_t>
static inline unsigned int
hb_ot_name_get_utf (hb_face_t       *face,
            hb_ot_name_id_t  name_id,
            hb_language_t    language,
            unsigned int    *text_size /* IN/OUT */,
            typename utf_t::codepoint_t *text /* OUT */)
{
  const OT::name_accelerator_t &name = *face->table.name;
 
  if (!language)
    language = hb_language_from_string ("en", 2);
 
  unsigned int width;
  int idx = name.get_index (name_id, language, &width);
  if (idx != -1)
  {
    hb_bytes_t bytes = name.get_name (idx);
 
    if (width == 2) /* UTF16-BE */
      return hb_ot_name_convert_utf<hb_utf16_be_t, utf_t> (bytes, text_size, text);
 
    if (width == 1) /* ASCII */
      return hb_ot_name_convert_utf<hb_ascii_t, utf_t> (bytes, text_size, text);
  }
 
  if (text_size)
  {
    if (*text_size)
      *text = 0;
    *text_size = 0;
  }
  return 0;
}
 
unsigned int
hb_ot_name_get_utf8 (hb_face_t       *face,
             hb_ot_name_id_t  name_id,
             hb_language_t    language,
             unsigned int    *text_size /* IN/OUT */,
             char            *text      /* OUT */)
{
  return hb_ot_name_get_utf<hb_utf8_t> (face, name_id, language, text_size,
                    (hb_utf8_t::codepoint_t *) text);
}
 
unsigned int
hb_ot_name_get_utf16 (hb_face_t       *face,
              hb_ot_name_id_t  name_id,
              hb_language_t    language,
              unsigned int    *text_size /* IN/OUT */,
              uint16_t        *text      /* OUT */)
{
  return hb_ot_name_get_utf<hb_utf16_t> (face, name_id, language, text_size, text);
}
 
unsigned int
hb_ot_name_get_utf32 (hb_face_t       *face,
              hb_ot_name_id_t  name_id,
              hb_language_t    language,
              unsigned int    *text_size /* IN/OUT */,
              uint32_t        *text      /* OUT */)
{
  return hb_ot_name_get_utf<hb_utf32_t> (face, name_id, language, text_size, text);
}
 
 
#endif