src/hb-buffer-serialize.cc - third_party/harfbuzz - Git at Google

 /*
  * Copyright © 2012,2013  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-buffer-private.hh"


 static const char *serialize_formats[] = {
   "text",
   "json",
   nullptr
 };

 /**
  * hb_buffer_serialize_list_formats:
  *
  * Returns a list of supported buffer serialization formats.
  *
  * Return value: (transfer none):
  * A string array of buffer serialization formats. Should not be freed.
  *
  * Since: 0.9.7
  **/
 const char **
 hb_buffer_serialize_list_formats (void)
 {
   return serialize_formats;
 }

 /**
  * hb_buffer_serialize_format_from_string:
  * @str: (array length=len) (element-type uint8_t): a string to parse
  * @len: length of @str, or -1 if string is %NULL terminated
  *
  * Parses a string into an #hb_buffer_serialize_format_t. Does not check if
  * @str is a valid buffer serialization format, use
  * hb_buffer_serialize_list_formats() to get the list of supported formats.
  *
  * Return value:
  * The parsed #hb_buffer_serialize_format_t.
  *
  * Since: 0.9.7
  **/
 hb_buffer_serialize_format_t
 hb_buffer_serialize_format_from_string (const char *str, int len)
 {
   /* Upper-case it. */
   return (hb_buffer_serialize_format_t) (hb_tag_from_string (str, len) & ~0x20202020u);
 }

 /**
  * hb_buffer_serialize_format_to_string:
  * @format: an #hb_buffer_serialize_format_t to convert.
  *
  * Converts @format to the string corresponding it, or %NULL if it is not a valid
  * #hb_buffer_serialize_format_t.
  *
  * Return value: (transfer none):
  * A %NULL terminated string corresponding to @format. Should not be freed.
  *
  * Since: 0.9.7
  **/
 const char *
 hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format)
 {
   switch (format)
   {
     case HB_BUFFER_SERIALIZE_FORMAT_TEXT:	return serialize_formats[0];
     case HB_BUFFER_SERIALIZE_FORMAT_JSON:	return serialize_formats[1];
     default:
     case HB_BUFFER_SERIALIZE_FORMAT_INVALID:	return nullptr;
   }
 }

 static unsigned int
 _hb_buffer_serialize_glyphs_json (hb_buffer_t *buffer,
 				  unsigned int start,
 				  unsigned int end,
 				  char *buf,
 				  unsigned int buf_size,
 				  unsigned int *buf_consumed,
 				  hb_font_t *font,
 				  hb_buffer_serialize_flags_t flags)
 {
   hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
   hb_glyph_position_t *pos = (flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS) ?
 			     nullptr : hb_buffer_get_glyph_positions (buffer, nullptr);

   *buf_consumed = 0;
   hb_position_t x = 0, y = 0;
   for (unsigned int i = start; i < end; i++)
   {
     char b[1024];
     char *p = b;

     /* In the following code, we know b is large enough that no overflow can happen. */

 #define APPEND(s) HB_STMT_START { strcpy (p, s); p += strlen (s); } HB_STMT_END

     if (i)
       *p++ = ',';

     *p++ = '{';

     APPEND ("\"g\":");
     if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
     {
       char g[128];
       hb_font_glyph_to_string (font, info[i].codepoint, g, sizeof (g));
       *p++ = '"';
       for (char *q = g; *q; q++) {
         if (*q == '"')
 	  *p++ = '\\';
 	*p++ = *q;
       }
       *p++ = '"';
     }
     else
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint));

     if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"cl\":%u", info[i].cluster));
     }

     if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
     {
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"dx\":%d,\"dy\":%d",
 			     x+pos[i].x_offset, y+pos[i].y_offset));
       if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
 	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"ax\":%d,\"ay\":%d",
 			       pos[i].x_advance, pos[i].y_advance));
     }

     if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS)
     {
       if (info[i].mask & HB_GLYPH_FLAG_DEFINED)
 	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"fl\":%u", info[i].mask & HB_GLYPH_FLAG_DEFINED));
     }

     if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS)
     {
       hb_glyph_extents_t extents;
       hb_font_get_glyph_extents(font, info[i].codepoint, &extents);
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"xb\":%d,\"yb\":%d",
 		extents.x_bearing, extents.y_bearing));
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"w\":%d,\"h\":%d",
 		extents.width, extents.height));
     }

     *p++ = '}';

     unsigned int l = p - b;
     if (buf_size > l)
     {
       memcpy (buf, b, l);
       buf += l;
       buf_size -= l;
       *buf_consumed += l;
       *buf = '\0';
     } else
       return i - start;

     if (pos && (flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
     {
       x += pos[i].x_advance;
       y += pos[i].y_advance;
     }
   }

   return end - start;
 }

 static unsigned int
 _hb_buffer_serialize_glyphs_text (hb_buffer_t *buffer,
 				  unsigned int start,
 				  unsigned int end,
 				  char *buf,
 				  unsigned int buf_size,
 				  unsigned int *buf_consumed,
 				  hb_font_t *font,
 				  hb_buffer_serialize_flags_t flags)
 {
   hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
   hb_glyph_position_t *pos = (flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS) ?
 			     nullptr : hb_buffer_get_glyph_positions (buffer, nullptr);

   *buf_consumed = 0;
   hb_position_t x = 0, y = 0;
   for (unsigned int i = start; i < end; i++)
   {
     char b[1024];
     char *p = b;

     /* In the following code, we know b is large enough that no overflow can happen. */

     if (i)
       *p++ = '|';

     if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
     {
       hb_font_glyph_to_string (font, info[i].codepoint, p, 128);
       p += strlen (p);
     }
     else
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint));

     if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "=%u", info[i].cluster));
     }

     if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
     {
       if (x+pos[i].x_offset || y+pos[i].y_offset)
 	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "@%d,%d", x+pos[i].x_offset, y+pos[i].y_offset));

       if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
       {
 	*p++ = '+';
 	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%d", pos[i].x_advance));
 	if (pos[i].y_advance)
 	  p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",%d", pos[i].y_advance));
       }
     }

     if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS)
     {
       if (info[i].mask &HB_GLYPH_FLAG_DEFINED)
 	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "#%X", info[i].mask &HB_GLYPH_FLAG_DEFINED));
     }

     if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS)
     {
       hb_glyph_extents_t extents;
       hb_font_get_glyph_extents(font, info[i].codepoint, &extents);
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "<%d,%d,%d,%d>", extents.x_bearing, extents.y_bearing, extents.width, extents.height));
     }

     unsigned int l = p - b;
     if (buf_size > l)
     {
       memcpy (buf, b, l);
       buf += l;
       buf_size -= l;
       *buf_consumed += l;
       *buf = '\0';
     } else
       return i - start;

     if (pos && (flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
     {
       x += pos[i].x_advance;
       y += pos[i].y_advance;
     }
   }

   return end - start;
 }

 /**
  * hb_buffer_serialize_glyphs:
  * @buffer: an #hb_buffer_t buffer.
  * @start: the first item in @buffer to serialize.
  * @end: the last item in @buffer to serialize.
  * @buf: (out) (array length=buf_size) (element-type uint8_t): output string to
  *       write serialized buffer into.
  * @buf_size: the size of @buf.
  * @buf_consumed: (out) (allow-none): if not %NULL, will be set to the number of byes written into @buf.
  * @font: (allow-none): the #hb_font_t used to shape this buffer, needed to
  *        read glyph names and extents. If %NULL, and empty font will be used.
  * @format: the #hb_buffer_serialize_format_t to use for formatting the output.
  * @flags: the #hb_buffer_serialize_flags_t that control what glyph properties
  *         to serialize.
  *
  * Serializes @buffer into a textual representation of its glyph content,
  * useful for showing the contents of the buffer, for example during debugging.
  * There are currently two supported serialization formats:
  *
  * ## text
  * A human-readable, plain text format.
  * The serialized glyphs will look something like:
  *
  * ```
  * [uni0651=0@518,0+0|uni0628=0+1897]
  * ```
  * - The serialized glyphs are delimited with `[` and `]`.
  * - Glyphs are separated with `|`
  * - Each glyph starts with glyph name, or glyph index if
  *   #HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES flag is set. Then,
  *   - If #HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS is not set, `=` then #hb_glyph_info_t.cluster.
  *   - If #HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS is not set, the #hb_glyph_position_t in the format:
  *     - If both #hb_glyph_position_t.x_offset and #hb_glyph_position_t.y_offset are not 0, `@x_offset,y_offset`. Then,
  *     - `+x_advance`, then `,y_advance` if #hb_glyph_position_t.y_advance is not 0. Then,
  *   - If #HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS is set, the
  *     #hb_glyph_extents_t in the format
  *     `&lt;x_bearing,y_bearing,width,height&gt;`
  *
  * ## json
  * TODO.
  *
  * Return value:
  * The number of serialized items.
  *
  * Since: 0.9.7
  **/
 unsigned int
 hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
 			    unsigned int start,
 			    unsigned int end,
 			    char *buf,
 			    unsigned int buf_size,
 			    unsigned int *buf_consumed,
 			    hb_font_t *font,
 			    hb_buffer_serialize_format_t format,
 			    hb_buffer_serialize_flags_t flags)
 {
   assert (start <= end && end <= buffer->len);

   unsigned int sconsumed;
   if (!buf_consumed)
     buf_consumed = &sconsumed;
   *buf_consumed = 0;
   if (buf_size)
     *buf = '\0';

   assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
 	  buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);

   if (!buffer->have_positions)
     flags |= HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS;

   if (unlikely (start == end))
     return 0;

   if (!font)
     font = hb_font_get_empty ();

   switch (format)
   {
     case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
       return _hb_buffer_serialize_glyphs_text (buffer, start, end,
 					       buf, buf_size, buf_consumed,
 					       font, flags);

     case HB_BUFFER_SERIALIZE_FORMAT_JSON:
       return _hb_buffer_serialize_glyphs_json (buffer, start, end,
 					       buf, buf_size, buf_consumed,
 					       font, flags);

     default:
     case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
       return 0;

   }
 }


 static hb_bool_t
 parse_uint (const char *pp, const char *end, uint32_t *pv)
 {
   char buf[32];
   unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
   strncpy (buf, pp, len);
   buf[len] = '\0';

   char *p = buf;
   char *pend = p;
   uint32_t v;

   errno = 0;
   v = strtol (p, &pend, 10);
   if (errno || p == pend || pend - p != end - pp)
     return false;

   *pv = v;
   return true;
 }

 static hb_bool_t
 parse_int (const char *pp, const char *end, int32_t *pv)
 {
   char buf[32];
   unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
   strncpy (buf, pp, len);
   buf[len] = '\0';

   char *p = buf;
   char *pend = p;
   int32_t v;

   errno = 0;
   v = strtol (p, &pend, 10);
   if (errno || p == pend || pend - p != end - pp)
     return false;

   *pv = v;
   return true;
 }

 #include "hb-buffer-deserialize-json.hh"
 #include "hb-buffer-deserialize-text.hh"

 /**
  * hb_buffer_deserialize_glyphs:
  * @buffer: an #hb_buffer_t buffer.
  * @buf: (array length=buf_len):
  * @buf_len:
  * @end_ptr: (out):
  * @font:
  * @format:
  *
  *
  *
  * Return value:
  *
  * Since: 0.9.7
  **/
 hb_bool_t
 hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
 			      const char *buf,
 			      int buf_len, /* -1 means nul-terminated */
 			      const char **end_ptr, /* May be nullptr */
 			      hb_font_t *font, /* May be nullptr */
 			      hb_buffer_serialize_format_t format)
 {
   const char *end;
   if (!end_ptr)
     end_ptr = &end;
   *end_ptr = buf;

   assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
 	  buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);

   if (buf_len == -1)
     buf_len = strlen (buf);

   if (!buf_len)
   {
     *end_ptr = buf;
     return false;
   }

   hb_buffer_set_content_type (buffer, HB_BUFFER_CONTENT_TYPE_GLYPHS);

   if (!font)
     font = hb_font_get_empty ();

   switch (format)
   {
     case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
       return _hb_buffer_deserialize_glyphs_text (buffer,
 						 buf, buf_len, end_ptr,
 						 font);

     case HB_BUFFER_SERIALIZE_FORMAT_JSON:
       return _hb_buffer_deserialize_glyphs_json (buffer,
 						 buf, buf_len, end_ptr,
 						 font);

     default:
     case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
       return false;

   }
 }
	/*
	* Copyright © 2012,2013 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-buffer-private.hh"


	static const char *serialize_formats[] = {
	"text",
	"json",
	nullptr
	};

	/**
	* hb_buffer_serialize_list_formats:
	*
	* Returns a list of supported buffer serialization formats.
	*
	* Return value: (transfer none):
	* A string array of buffer serialization formats. Should not be freed.
	*
	* Since: 0.9.7
	**/
	const char **
	hb_buffer_serialize_list_formats (void)
	{
	return serialize_formats;
	}

	/**
	* hb_buffer_serialize_format_from_string:
	* @str: (array length=len) (element-type uint8_t): a string to parse
	* @len: length of @str, or -1 if string is %NULL terminated
	*
	* Parses a string into an #hb_buffer_serialize_format_t. Does not check if
	* @str is a valid buffer serialization format, use
	* hb_buffer_serialize_list_formats() to get the list of supported formats.
	*
	* Return value:
	* The parsed #hb_buffer_serialize_format_t.
	*
	* Since: 0.9.7
	**/
	hb_buffer_serialize_format_t
	hb_buffer_serialize_format_from_string (const char *str, int len)
	{
	/* Upper-case it. */
	return (hb_buffer_serialize_format_t) (hb_tag_from_string (str, len) & ~0x20202020u);
	}

	/**
	* hb_buffer_serialize_format_to_string:
	* @format: an #hb_buffer_serialize_format_t to convert.
	*
	* Converts @format to the string corresponding it, or %NULL if it is not a valid
	* #hb_buffer_serialize_format_t.
	*
	* Return value: (transfer none):
	* A %NULL terminated string corresponding to @format. Should not be freed.
	*
	* Since: 0.9.7
	**/
	const char *
	hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format)
	{
	switch (format)
	{
	case HB_BUFFER_SERIALIZE_FORMAT_TEXT: return serialize_formats[0];
	case HB_BUFFER_SERIALIZE_FORMAT_JSON: return serialize_formats[1];
	default:
	case HB_BUFFER_SERIALIZE_FORMAT_INVALID: return nullptr;
	}
	}

	static unsigned int
	_hb_buffer_serialize_glyphs_json (hb_buffer_t *buffer,
	unsigned int start,
	unsigned int end,
	char *buf,
	unsigned int buf_size,
	unsigned int *buf_consumed,
	hb_font_t *font,
	hb_buffer_serialize_flags_t flags)
	{
	hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
	hb_glyph_position_t *pos = (flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS) ?
	nullptr : hb_buffer_get_glyph_positions (buffer, nullptr);

	*buf_consumed = 0;
	hb_position_t x = 0, y = 0;
	for (unsigned int i = start; i < end; i++)
	{
	char b[1024];
	char *p = b;

	/* In the following code, we know b is large enough that no overflow can happen. */

	#define APPEND(s) HB_STMT_START { strcpy (p, s); p += strlen (s); } HB_STMT_END

	if (i)
	*p++ = ',';

	*p++ = '{';

	APPEND ("\"g\":");
	if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
	{
	char g[128];
	hb_font_glyph_to_string (font, info[i].codepoint, g, sizeof (g));
	*p++ = '"';
	for (char q = g; q; q++) {
	if (*q == '"')
	*p++ = '\\';
	p++ = q;
	}
	*p++ = '"';
	}
	else
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint));

	if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"cl\":%u", info[i].cluster));
	}

	if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
	{
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"dx\":%d,\"dy\":%d",
	x+pos[i].x_offset, y+pos[i].y_offset));
	if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"ax\":%d,\"ay\":%d",
	pos[i].x_advance, pos[i].y_advance));
	}

	if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS)
	{
	if (info[i].mask & HB_GLYPH_FLAG_DEFINED)
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"fl\":%u", info[i].mask & HB_GLYPH_FLAG_DEFINED));
	}

	if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS)
	{
	hb_glyph_extents_t extents;
	hb_font_get_glyph_extents(font, info[i].codepoint, &extents);
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"xb\":%d,\"yb\":%d",
	extents.x_bearing, extents.y_bearing));
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"w\":%d,\"h\":%d",
	extents.width, extents.height));
	}

	*p++ = '}';

	unsigned int l = p - b;
	if (buf_size > l)
	{
	memcpy (buf, b, l);
	buf += l;
	buf_size -= l;
	*buf_consumed += l;
	*buf = '\0';
	} else
	return i - start;

	if (pos && (flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
	{
	x += pos[i].x_advance;
	y += pos[i].y_advance;
	}
	}

	return end - start;
	}

	static unsigned int
	_hb_buffer_serialize_glyphs_text (hb_buffer_t *buffer,
	unsigned int start,
	unsigned int end,
	char *buf,
	unsigned int buf_size,
	unsigned int *buf_consumed,
	hb_font_t *font,
	hb_buffer_serialize_flags_t flags)
	{
	hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, nullptr);
	hb_glyph_position_t *pos = (flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS) ?
	nullptr : hb_buffer_get_glyph_positions (buffer, nullptr);

	*buf_consumed = 0;
	hb_position_t x = 0, y = 0;
	for (unsigned int i = start; i < end; i++)
	{
	char b[1024];
	char *p = b;

	/* In the following code, we know b is large enough that no overflow can happen. */

	if (i)
	*p++ = '\|';

	if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
	{
	hb_font_glyph_to_string (font, info[i].codepoint, p, 128);
	p += strlen (p);
	}
	else
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint));

	if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "=%u", info[i].cluster));
	}

	if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
	{
	if (x+pos[i].x_offset \|\| y+pos[i].y_offset)
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "@%d,%d", x+pos[i].x_offset, y+pos[i].y_offset));

	if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
	{
	*p++ = '+';
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%d", pos[i].x_advance));
	if (pos[i].y_advance)
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",%d", pos[i].y_advance));
	}
	}

	if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS)
	{
	if (info[i].mask &HB_GLYPH_FLAG_DEFINED)
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "#%X", info[i].mask &HB_GLYPH_FLAG_DEFINED));
	}

	if (flags & HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS)
	{
	hb_glyph_extents_t extents;
	hb_font_get_glyph_extents(font, info[i].codepoint, &extents);
	p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "<%d,%d,%d,%d>", extents.x_bearing, extents.y_bearing, extents.width, extents.height));
	}

	unsigned int l = p - b;
	if (buf_size > l)
	{
	memcpy (buf, b, l);
	buf += l;
	buf_size -= l;
	*buf_consumed += l;
	*buf = '\0';
	} else
	return i - start;

	if (pos && (flags & HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES))
	{
	x += pos[i].x_advance;
	y += pos[i].y_advance;
	}
	}

	return end - start;
	}

	/**
	* hb_buffer_serialize_glyphs:
	* @buffer: an #hb_buffer_t buffer.
	* @start: the first item in @buffer to serialize.
	* @end: the last item in @buffer to serialize.
	* @buf: (out) (array length=buf_size) (element-type uint8_t): output string to
	* write serialized buffer into.
	* @buf_size: the size of @buf.
	* @buf_consumed: (out) (allow-none): if not %NULL, will be set to the number of byes written into @buf.
	* @font: (allow-none): the #hb_font_t used to shape this buffer, needed to
	* read glyph names and extents. If %NULL, and empty font will be used.
	* @format: the #hb_buffer_serialize_format_t to use for formatting the output.
	* @flags: the #hb_buffer_serialize_flags_t that control what glyph properties
	* to serialize.
	*
	* Serializes @buffer into a textual representation of its glyph content,
	* useful for showing the contents of the buffer, for example during debugging.
	* There are currently two supported serialization formats:
	*
	* ## text
	* A human-readable, plain text format.
	* The serialized glyphs will look something like:
	*
	* ```
	* [uni0651=0@518,0+0\|uni0628=0+1897]
	* ```
	* - The serialized glyphs are delimited with `[` and `]`.
	* - Glyphs are separated with `\|`
	* - Each glyph starts with glyph name, or glyph index if
	* #HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES flag is set. Then,
	* - If #HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS is not set, `=` then #hb_glyph_info_t.cluster.
	* - If #HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS is not set, the #hb_glyph_position_t in the format:
	* - If both #hb_glyph_position_t.x_offset and #hb_glyph_position_t.y_offset are not 0, `@x_offset,y_offset`. Then,
	* - `+x_advance`, then `,y_advance` if #hb_glyph_position_t.y_advance is not 0. Then,
	* - If #HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS is set, the
	* #hb_glyph_extents_t in the format
	* `<x_bearing,y_bearing,width,height>`
	*
	* ## json
	* TODO.
	*
	* Return value:
	* The number of serialized items.
	*
	* Since: 0.9.7
	**/
	unsigned int
	hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
	unsigned int start,
	unsigned int end,
	char *buf,
	unsigned int buf_size,
	unsigned int *buf_consumed,
	hb_font_t *font,
	hb_buffer_serialize_format_t format,
	hb_buffer_serialize_flags_t flags)
	{
	assert (start <= end && end <= buffer->len);

	unsigned int sconsumed;
	if (!buf_consumed)
	buf_consumed = &sconsumed;
	*buf_consumed = 0;
	if (buf_size)
	*buf = '\0';

	assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) \|\|
	buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);

	if (!buffer->have_positions)
	flags \|= HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS;

	if (unlikely (start == end))
	return 0;

	if (!font)
	font = hb_font_get_empty ();

	switch (format)
	{
	case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
	return _hb_buffer_serialize_glyphs_text (buffer, start, end,
	buf, buf_size, buf_consumed,
	font, flags);

	case HB_BUFFER_SERIALIZE_FORMAT_JSON:
	return _hb_buffer_serialize_glyphs_json (buffer, start, end,
	buf, buf_size, buf_consumed,
	font, flags);

	default:
	case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
	return 0;

	}
	}


	static hb_bool_t
	parse_uint (const char pp, const char end, uint32_t *pv)
	{
	char buf[32];
	unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
	strncpy (buf, pp, len);
	buf[len] = '\0';

	char *p = buf;
	char *pend = p;
	uint32_t v;

	errno = 0;
	v = strtol (p, &pend, 10);
	if (errno \|\| p == pend \|\| pend - p != end - pp)
	return false;

	*pv = v;
	return true;
	}

	static hb_bool_t
	parse_int (const char pp, const char end, int32_t *pv)
	{
	char buf[32];
	unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
	strncpy (buf, pp, len);
	buf[len] = '\0';

	char *p = buf;
	char *pend = p;
	int32_t v;

	errno = 0;
	v = strtol (p, &pend, 10);
	if (errno \|\| p == pend \|\| pend - p != end - pp)
	return false;

	*pv = v;
	return true;
	}

	#include "hb-buffer-deserialize-json.hh"
	#include "hb-buffer-deserialize-text.hh"

	/**
	* hb_buffer_deserialize_glyphs:
	* @buffer: an #hb_buffer_t buffer.
	* @buf: (array length=buf_len):
	* @buf_len:
	* @end_ptr: (out):
	* @font:
	* @format:
	*
	*
	*
	* Return value:
	*
	* Since: 0.9.7
	**/
	hb_bool_t
	hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
	const char *buf,
	int buf_len, /* -1 means nul-terminated */
	const char *end_ptr, / May be nullptr */
	hb_font_t font, / May be nullptr */
	hb_buffer_serialize_format_t format)
	{
	const char *end;
	if (!end_ptr)
	end_ptr = &end;
	*end_ptr = buf;

	assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) \|\|
	buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);

	if (buf_len == -1)
	buf_len = strlen (buf);

	if (!buf_len)
	{
	*end_ptr = buf;
	return false;
	}

	hb_buffer_set_content_type (buffer, HB_BUFFER_CONTENT_TYPE_GLYPHS);

	if (!font)
	font = hb_font_get_empty ();

	switch (format)
	{
	case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
	return _hb_buffer_deserialize_glyphs_text (buffer,
	buf, buf_len, end_ptr,
	font);

	case HB_BUFFER_SERIALIZE_FORMAT_JSON:
	return _hb_buffer_deserialize_glyphs_json (buffer,
	buf, buf_len, end_ptr,
	font);

	default:
	case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
	return false;

	}
	}