218 lines
5.9 KiB
C++
218 lines
5.9 KiB
C++
/*
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* Copyright © 2023 Behdad Esfahbod
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef HB_WASM_API_BUFFER_HH
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#define HB_WASM_API_BUFFER_HH
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#include "hb-wasm-api.hh"
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#include "hb-buffer.hh"
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namespace hb {
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namespace wasm {
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static_assert (sizeof (glyph_info_t) == sizeof (hb_glyph_info_t), "");
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static_assert (sizeof (glyph_position_t) == sizeof (hb_glyph_position_t), "");
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HB_WASM_API (bool_t, buffer_contents_realloc) (HB_WASM_EXEC_ENV
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ptr_d(buffer_contents_t, contents),
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uint32_t size)
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{
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HB_PTR_PARAM (buffer_contents_t, contents);
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if (unlikely (!contents))
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return false;
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if (size <= contents->length)
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return true;
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unsigned bytes;
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if (hb_unsigned_mul_overflows (size, sizeof (glyph_info_t), &bytes))
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return false;
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glyph_info_t *info = HB_ARRAY_APP2NATIVE (glyph_info_t, contents->info, contents->length);
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glyph_position_t *pos = HB_ARRAY_APP2NATIVE (glyph_position_t, contents->pos, contents->length);
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if (unlikely (!info || !pos))
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return false;
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glyph_info_t *new_info = nullptr;
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uint32_t new_inforef = module_malloc (bytes, (void **) &new_info);
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glyph_position_t *new_pos = nullptr;
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uint32_t new_posref = module_malloc (bytes, (void **) &new_pos);
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unsigned old_bytes = contents->length * sizeof (glyph_info_t);
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if (likely (new_inforef))
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{
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memcpy (new_info, info, old_bytes);
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module_free (contents->info);
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contents->info = new_inforef;
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}
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if (likely (new_posref))
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{
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memcpy (new_pos, pos, old_bytes);
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module_free (contents->pos);
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contents->pos = new_posref;
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}
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if (likely (new_info && new_pos))
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{
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contents->length = size;
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return true;
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}
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return false;
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}
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HB_WASM_API (void, buffer_contents_free) (HB_WASM_EXEC_ENV
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ptr_d(buffer_contents_t, contents))
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{
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HB_PTR_PARAM (buffer_contents_t, contents);
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if (unlikely (!contents))
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return;
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module_free (contents->info);
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module_free (contents->pos);
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contents->info = nullref;
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contents->pos = nullref;
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contents->length = 0;
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}
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HB_WASM_API (bool_t, buffer_copy_contents) (HB_WASM_EXEC_ENV
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ptr_d(buffer_t, buffer),
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ptr_d(buffer_contents_t, contents))
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{
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HB_REF2OBJ (buffer);
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HB_PTR_PARAM (buffer_contents_t, contents);
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if (unlikely (!contents))
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return false;
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if (buffer->have_output)
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buffer->sync ();
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if (!buffer->have_positions)
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buffer->clear_positions ();
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unsigned length = buffer->len;
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if (length <= contents->length)
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{
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glyph_info_t *info = HB_ARRAY_APP2NATIVE (glyph_info_t, contents->info, length);
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glyph_position_t *pos = HB_ARRAY_APP2NATIVE (glyph_position_t, contents->pos, length);
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if (unlikely (!info || !pos))
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{
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contents->length = 0;
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return false;
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}
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unsigned bytes = length * sizeof (hb_glyph_info_t);
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memcpy (info, buffer->info, bytes);
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memcpy (pos, buffer->pos, bytes);
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return true;
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}
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module_free (contents->info);
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module_free (contents->pos);
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contents->length = length;
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unsigned bytes = length * sizeof (hb_glyph_info_t);
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contents->info = wasm_runtime_module_dup_data (module_inst, (const char *) buffer->info, bytes);
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contents->pos = wasm_runtime_module_dup_data (module_inst, (const char *) buffer->pos, bytes);
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if (length && (!contents->info || !contents->pos))
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{
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contents->length = 0;
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return false;
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}
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return true;
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}
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HB_WASM_API (bool_t, buffer_set_contents) (HB_WASM_EXEC_ENV
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ptr_d(buffer_t, buffer),
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ptr_d(const buffer_contents_t, contents))
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{
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HB_REF2OBJ (buffer);
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HB_PTR_PARAM (buffer_contents_t, contents);
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if (unlikely (!contents))
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return false;
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unsigned length = contents->length;
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unsigned bytes;
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if (unlikely (hb_unsigned_mul_overflows (length, sizeof (buffer->info[0]), &bytes)))
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return false;
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if (unlikely (!buffer->resize (length)))
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return false;
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glyph_info_t *info = (glyph_info_t *) (validate_app_addr (contents->info, bytes) ? addr_app_to_native (contents->info) : nullptr);
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glyph_position_t *pos = (glyph_position_t *) (validate_app_addr (contents->pos, bytes) ? addr_app_to_native (contents->pos) : nullptr);
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if (!buffer->have_positions)
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buffer->clear_positions (); /* This is wasteful. */
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memcpy (buffer->info, info, bytes);
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memcpy (buffer->pos, pos, bytes);
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buffer->len = length;
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return true;
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}
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HB_WASM_API (direction_t, buffer_get_direction) (HB_WASM_EXEC_ENV
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ptr_d(buffer_t, buffer))
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{
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HB_REF2OBJ (buffer);
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return (direction_t) hb_buffer_get_direction (buffer);
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}
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HB_WASM_API (script_t, buffer_get_script) (HB_WASM_EXEC_ENV
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ptr_d(buffer_t, buffer))
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{
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HB_REF2OBJ (buffer);
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return hb_script_to_iso15924_tag (hb_buffer_get_script (buffer));
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}
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HB_WASM_API (void, buffer_reverse) (HB_WASM_EXEC_ENV
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ptr_d(buffer_t, buffer))
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{
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HB_REF2OBJ (buffer);
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hb_buffer_reverse (buffer);
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}
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HB_WASM_API (void, buffer_reverse_clusters) (HB_WASM_EXEC_ENV
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ptr_d(buffer_t, buffer))
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{
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HB_REF2OBJ (buffer);
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hb_buffer_reverse_clusters (buffer);
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}
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}}
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#endif /* HB_WASM_API_BUFFER_HH */
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