hb-wasm-api-buffer.hh

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/*

 * Copyright © 2023  Behdad Esfahbod

 *  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.

*/

#ifndef HB_WASM_API_BUFFER_HH

#define HB_WASM_API_BUFFER_HH

#include "hb-wasm-api.hh"

#include "hb-buffer.hh"

namespace hb {

namespace wasm {

static_assert (sizeof (glyph_info_t) == sizeof (hb_glyph_info_t), "");

static_assert (sizeof (glyph_position_t) == sizeof (hb_glyph_position_t), "");

HB_WASM_API (bool_t, buffer_contents_realloc) (HB_WASM_EXEC_ENV

					       ptr_d(buffer_contents_t, contents),

					       uint32_t size)

  HB_PTR_PARAM (buffer_contents_t, contents);

  if (unlikely (!contents))

    return false;

  if (size <= contents->length)

    return true;

  unsigned bytes;

  if (hb_unsigned_mul_overflows (size, sizeof (glyph_info_t), &bytes))

    return false;

  glyph_info_t *info = HB_ARRAY_APP2NATIVE (glyph_info_t, contents->info, contents->length);

  glyph_position_t *pos = HB_ARRAY_APP2NATIVE (glyph_position_t, contents->pos, contents->length);

  if (unlikely (!info || !pos))

    return false;

  glyph_info_t *new_info = nullptr;

  uint32_t new_inforef = module_malloc (bytes, (void **) &new_info);

  glyph_position_t *new_pos = nullptr;

  uint32_t new_posref = module_malloc (bytes, (void **) &new_pos);

  unsigned old_bytes = contents->length * sizeof (glyph_info_t);

  if (likely (new_inforef))

    hb_memcpy (new_info, info, old_bytes);

    module_free (contents->info);

    contents->info = new_inforef;

  if (likely (new_posref))

    hb_memcpy (new_pos, pos, old_bytes);

    module_free (contents->pos);

    contents->pos = new_posref;

  if (likely (new_info && new_pos))

    contents->length = size;

    return true;

  return false;

HB_WASM_API (void, buffer_contents_free) (HB_WASM_EXEC_ENV

					  ptr_d(buffer_contents_t, contents))

  HB_PTR_PARAM (buffer_contents_t, contents);

  if (unlikely (!contents))

    return;

  module_free (contents->info);

  module_free (contents->pos);

  contents->info = nullref;

  contents->pos = nullref;

  contents->length = 0;

HB_WASM_API (bool_t, buffer_copy_contents) (HB_WASM_EXEC_ENV

					    ptr_d(buffer_t, buffer),

					    ptr_d(buffer_contents_t, contents))

  HB_REF2OBJ (buffer);

  HB_PTR_PARAM (buffer_contents_t, contents);

  if (unlikely (!contents))

    return false;

  if (buffer->have_output)

    buffer->sync ();

  if (!buffer->have_positions)

    buffer->clear_positions ();

  unsigned length = buffer->len;

  if (length <= contents->length)

    glyph_info_t *info = HB_ARRAY_APP2NATIVE (glyph_info_t, contents->info, length);

    glyph_position_t *pos = HB_ARRAY_APP2NATIVE (glyph_position_t, contents->pos, length);

    if (unlikely (!info || !pos))

      contents->length = 0;

      return false;

    unsigned bytes = length * sizeof (hb_glyph_info_t);

    hb_memcpy (info, buffer->info, bytes);

    hb_memcpy (pos, buffer->pos, bytes);

    return true;

  module_free (contents->info);

  module_free (contents->pos);

  contents->length = length;

  unsigned bytes = length * sizeof (hb_glyph_info_t);

  contents->info = wasm_runtime_module_dup_data (module_inst, (const char *) buffer->info, bytes);

  contents->pos = wasm_runtime_module_dup_data (module_inst, (const char *) buffer->pos, bytes);

  if (length && (!contents->info || !contents->pos))

    contents->length = 0;

    return false;

  return true;

HB_WASM_API (bool_t, buffer_set_contents) (HB_WASM_EXEC_ENV

					   ptr_d(buffer_t, buffer),

					   ptr_d(const buffer_contents_t, contents))

  HB_REF2OBJ (buffer);

  HB_PTR_PARAM (buffer_contents_t, contents);

  if (unlikely (!contents))

    return false;

  unsigned length = contents->length;

  unsigned bytes;

  if (unlikely (hb_unsigned_mul_overflows (length, sizeof (buffer->info[0]), &bytes)))

    return false;

  if (unlikely (!buffer->resize (length)))

    return false;

  glyph_info_t *info = (glyph_info_t *) (validate_app_addr (contents->info, bytes) ? addr_app_to_native (contents->info) : nullptr);

  glyph_position_t *pos = (glyph_position_t *) (validate_app_addr (contents->pos, bytes) ? addr_app_to_native (contents->pos) : nullptr);

  if (!buffer->have_positions)

    buffer->clear_positions (); /* This is wasteful. */

  hb_memcpy (buffer->info, info, bytes);

  hb_memcpy (buffer->pos, pos, bytes);

  buffer->len = length;

  return true;

HB_WASM_API (direction_t, buffer_get_direction) (HB_WASM_EXEC_ENV

						 ptr_d(buffer_t, buffer))

  HB_REF2OBJ (buffer);

  return (direction_t) hb_buffer_get_direction (buffer);

HB_WASM_API (script_t, buffer_get_script) (HB_WASM_EXEC_ENV

					   ptr_d(buffer_t, buffer))

  HB_REF2OBJ (buffer);

  return hb_script_to_iso15924_tag (hb_buffer_get_script (buffer));

HB_WASM_API (void, buffer_reverse) (HB_WASM_EXEC_ENV

				    ptr_d(buffer_t, buffer))

  HB_REF2OBJ (buffer);

  hb_buffer_reverse (buffer);

HB_WASM_API (void, buffer_reverse_clusters) (HB_WASM_EXEC_ENV

					     ptr_d(buffer_t, buffer))

  HB_REF2OBJ (buffer);

  hb_buffer_reverse_clusters (buffer);

}}

#endif /* HB_WASM_API_BUFFER_HH */