1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/harfbuzz/src/hb-buffer-serialize.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,399 @@
1.4 +/*
1.5 + * Copyright © 2012,2013 Google, Inc.
1.6 + *
1.7 + * This is part of HarfBuzz, a text shaping library.
1.8 + *
1.9 + * Permission is hereby granted, without written agreement and without
1.10 + * license or royalty fees, to use, copy, modify, and distribute this
1.11 + * software and its documentation for any purpose, provided that the
1.12 + * above copyright notice and the following two paragraphs appear in
1.13 + * all copies of this software.
1.14 + *
1.15 + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
1.16 + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
1.17 + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
1.18 + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
1.19 + * DAMAGE.
1.20 + *
1.21 + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
1.22 + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.23 + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
1.24 + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
1.25 + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
1.26 + *
1.27 + * Google Author(s): Behdad Esfahbod
1.28 + */
1.29 +
1.30 +#include "hb-buffer-private.hh"
1.31 +
1.32 +
1.33 +static const char *serialize_formats[] = {
1.34 + "text",
1.35 + "json",
1.36 + NULL
1.37 +};
1.38 +
1.39 +/**
1.40 + * hb_buffer_serialize_list_formats:
1.41 + *
1.42 + *
1.43 + *
1.44 + * Return value: (transfer none):
1.45 + *
1.46 + * Since: 1.0
1.47 + **/
1.48 +const char **
1.49 +hb_buffer_serialize_list_formats (void)
1.50 +{
1.51 + return serialize_formats;
1.52 +}
1.53 +
1.54 +/**
1.55 + * hb_buffer_serialize_format_from_string:
1.56 + * @str:
1.57 + * @len:
1.58 + *
1.59 + *
1.60 + *
1.61 + * Return value:
1.62 + *
1.63 + * Since: 1.0
1.64 + **/
1.65 +hb_buffer_serialize_format_t
1.66 +hb_buffer_serialize_format_from_string (const char *str, int len)
1.67 +{
1.68 + /* Upper-case it. */
1.69 + return (hb_buffer_serialize_format_t) (hb_tag_from_string (str, len) & ~0x20202020);
1.70 +}
1.71 +
1.72 +/**
1.73 + * hb_buffer_serialize_format_to_string:
1.74 + * @format:
1.75 + *
1.76 + *
1.77 + *
1.78 + * Return value:
1.79 + *
1.80 + * Since: 1.0
1.81 + **/
1.82 +const char *
1.83 +hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format)
1.84 +{
1.85 + switch (format)
1.86 + {
1.87 + case HB_BUFFER_SERIALIZE_FORMAT_TEXT: return serialize_formats[0];
1.88 + case HB_BUFFER_SERIALIZE_FORMAT_JSON: return serialize_formats[1];
1.89 + default:
1.90 + case HB_BUFFER_SERIALIZE_FORMAT_INVALID: return NULL;
1.91 + }
1.92 +}
1.93 +
1.94 +static unsigned int
1.95 +_hb_buffer_serialize_glyphs_json (hb_buffer_t *buffer,
1.96 + unsigned int start,
1.97 + unsigned int end,
1.98 + char *buf,
1.99 + unsigned int buf_size,
1.100 + unsigned int *buf_consumed,
1.101 + hb_font_t *font,
1.102 + hb_buffer_serialize_flags_t flags)
1.103 +{
1.104 + hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
1.105 + hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
1.106 +
1.107 + *buf_consumed = 0;
1.108 + for (unsigned int i = start; i < end; i++)
1.109 + {
1.110 + char b[1024];
1.111 + char *p = b;
1.112 +
1.113 + /* In the following code, we know b is large enough that no overflow can happen. */
1.114 +
1.115 +#define APPEND(s) HB_STMT_START { strcpy (p, s); p += strlen (s); } HB_STMT_END
1.116 +
1.117 + if (i)
1.118 + *p++ = ',';
1.119 +
1.120 + *p++ = '{';
1.121 +
1.122 + APPEND ("\"g\":");
1.123 + if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
1.124 + {
1.125 + char g[128];
1.126 + hb_font_glyph_to_string (font, info[i].codepoint, g, sizeof (g));
1.127 + *p++ = '"';
1.128 + for (char *q = g; *q; q++) {
1.129 + if (*q == '"')
1.130 + *p++ = '\\';
1.131 + *p++ = *q;
1.132 + }
1.133 + *p++ = '"';
1.134 + }
1.135 + else
1.136 + p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint));
1.137 +
1.138 + if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
1.139 + p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"cl\":%u", info[i].cluster));
1.140 + }
1.141 +
1.142 + if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
1.143 + {
1.144 + p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"dx\":%d,\"dy\":%d",
1.145 + pos[i].x_offset, pos[i].y_offset);
1.146 + p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"ax\":%d,\"ay\":%d",
1.147 + pos[i].x_advance, pos[i].y_advance);
1.148 + }
1.149 +
1.150 + *p++ = '}';
1.151 +
1.152 + unsigned int l = p - b;
1.153 + if (buf_size > l)
1.154 + {
1.155 + memcpy (buf, b, l);
1.156 + buf += l;
1.157 + buf_size -= l;
1.158 + *buf_consumed += l;
1.159 + *buf = '\0';
1.160 + } else
1.161 + return i - start;
1.162 + }
1.163 +
1.164 + return end - start;
1.165 +}
1.166 +
1.167 +static unsigned int
1.168 +_hb_buffer_serialize_glyphs_text (hb_buffer_t *buffer,
1.169 + unsigned int start,
1.170 + unsigned int end,
1.171 + char *buf,
1.172 + unsigned int buf_size,
1.173 + unsigned int *buf_consumed,
1.174 + hb_font_t *font,
1.175 + hb_buffer_serialize_flags_t flags)
1.176 +{
1.177 + hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
1.178 + hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
1.179 +
1.180 + *buf_consumed = 0;
1.181 + for (unsigned int i = start; i < end; i++)
1.182 + {
1.183 + char b[1024];
1.184 + char *p = b;
1.185 +
1.186 + /* In the following code, we know b is large enough that no overflow can happen. */
1.187 +
1.188 + if (i)
1.189 + *p++ = '|';
1.190 +
1.191 + if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
1.192 + {
1.193 + hb_font_glyph_to_string (font, info[i].codepoint, p, 128);
1.194 + p += strlen (p);
1.195 + }
1.196 + else
1.197 + p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint));
1.198 +
1.199 + if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
1.200 + p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "=%u", info[i].cluster));
1.201 + }
1.202 +
1.203 + if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
1.204 + {
1.205 + if (pos[i].x_offset || pos[i].y_offset)
1.206 + p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "@%d,%d", pos[i].x_offset, pos[i].y_offset));
1.207 +
1.208 + *p++ = '+';
1.209 + p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%d", pos[i].x_advance));
1.210 + if (pos[i].y_advance)
1.211 + p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",%d", pos[i].y_advance));
1.212 + }
1.213 +
1.214 + unsigned int l = p - b;
1.215 + if (buf_size > l)
1.216 + {
1.217 + memcpy (buf, b, l);
1.218 + buf += l;
1.219 + buf_size -= l;
1.220 + *buf_consumed += l;
1.221 + *buf = '\0';
1.222 + } else
1.223 + return i - start;
1.224 + }
1.225 +
1.226 + return end - start;
1.227 +}
1.228 +
1.229 +/* Returns number of items, starting at start, that were serialized. */
1.230 +/**
1.231 + * hb_buffer_serialize_glyphs:
1.232 + * @buffer: a buffer.
1.233 + * @start:
1.234 + * @end:
1.235 + * @buf: (array length=buf_size):
1.236 + * @buf_size:
1.237 + * @buf_consumed: (out):
1.238 + * @font:
1.239 + * @format:
1.240 + * @flags:
1.241 + *
1.242 + *
1.243 + *
1.244 + * Return value:
1.245 + *
1.246 + * Since: 1.0
1.247 + **/
1.248 +unsigned int
1.249 +hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
1.250 + unsigned int start,
1.251 + unsigned int end,
1.252 + char *buf,
1.253 + unsigned int buf_size,
1.254 + unsigned int *buf_consumed, /* May be NULL */
1.255 + hb_font_t *font, /* May be NULL */
1.256 + hb_buffer_serialize_format_t format,
1.257 + hb_buffer_serialize_flags_t flags)
1.258 +{
1.259 + assert (start <= end && end <= buffer->len);
1.260 +
1.261 + unsigned int sconsumed;
1.262 + if (!buf_consumed)
1.263 + buf_consumed = &sconsumed;
1.264 + *buf_consumed = 0;
1.265 +
1.266 + assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
1.267 + buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
1.268 +
1.269 + if (unlikely (start == end))
1.270 + return 0;
1.271 +
1.272 + if (!font)
1.273 + font = hb_font_get_empty ();
1.274 +
1.275 + switch (format)
1.276 + {
1.277 + case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
1.278 + return _hb_buffer_serialize_glyphs_text (buffer, start, end,
1.279 + buf, buf_size, buf_consumed,
1.280 + font, flags);
1.281 +
1.282 + case HB_BUFFER_SERIALIZE_FORMAT_JSON:
1.283 + return _hb_buffer_serialize_glyphs_json (buffer, start, end,
1.284 + buf, buf_size, buf_consumed,
1.285 + font, flags);
1.286 +
1.287 + default:
1.288 + case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
1.289 + return 0;
1.290 +
1.291 + }
1.292 +}
1.293 +
1.294 +
1.295 +static hb_bool_t
1.296 +parse_uint (const char *pp, const char *end, uint32_t *pv)
1.297 +{
1.298 + char buf[32];
1.299 + unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
1.300 + strncpy (buf, pp, len);
1.301 + buf[len] = '\0';
1.302 +
1.303 + char *p = buf;
1.304 + char *pend = p;
1.305 + uint32_t v;
1.306 +
1.307 + errno = 0;
1.308 + v = strtol (p, &pend, 10);
1.309 + if (errno || p == pend || pend - p != end - pp)
1.310 + return false;
1.311 +
1.312 + *pv = v;
1.313 + return true;
1.314 +}
1.315 +
1.316 +static hb_bool_t
1.317 +parse_int (const char *pp, const char *end, int32_t *pv)
1.318 +{
1.319 + char buf[32];
1.320 + unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
1.321 + strncpy (buf, pp, len);
1.322 + buf[len] = '\0';
1.323 +
1.324 + char *p = buf;
1.325 + char *pend = p;
1.326 + int32_t v;
1.327 +
1.328 + errno = 0;
1.329 + v = strtol (p, &pend, 10);
1.330 + if (errno || p == pend || pend - p != end - pp)
1.331 + return false;
1.332 +
1.333 + *pv = v;
1.334 + return true;
1.335 +}
1.336 +
1.337 +#include "hb-buffer-deserialize-json.hh"
1.338 +#include "hb-buffer-deserialize-text.hh"
1.339 +
1.340 +/**
1.341 + * hb_buffer_deserialize_glyphs:
1.342 + * @buffer: a buffer.
1.343 + * @buf: (array length=buf_len):
1.344 + * @buf_len:
1.345 + * @end_ptr: (out):
1.346 + * @font:
1.347 + * @format:
1.348 + *
1.349 + *
1.350 + *
1.351 + * Return value:
1.352 + *
1.353 + * Since: 1.0
1.354 + **/
1.355 +hb_bool_t
1.356 +hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
1.357 + const char *buf,
1.358 + int buf_len, /* -1 means nul-terminated */
1.359 + const char **end_ptr, /* May be NULL */
1.360 + hb_font_t *font, /* May be NULL */
1.361 + hb_buffer_serialize_format_t format)
1.362 +{
1.363 + const char *end;
1.364 + if (!end_ptr)
1.365 + end_ptr = &end;
1.366 + *end_ptr = buf;
1.367 +
1.368 + assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
1.369 + buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
1.370 +
1.371 + if (buf_len == -1)
1.372 + buf_len = strlen (buf);
1.373 +
1.374 + if (!buf_len)
1.375 + {
1.376 + *end_ptr = buf;
1.377 + return false;
1.378 + }
1.379 +
1.380 + hb_buffer_set_content_type (buffer, HB_BUFFER_CONTENT_TYPE_GLYPHS);
1.381 +
1.382 + if (!font)
1.383 + font = hb_font_get_empty ();
1.384 +
1.385 + switch (format)
1.386 + {
1.387 + case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
1.388 + return _hb_buffer_deserialize_glyphs_text (buffer,
1.389 + buf, buf_len, end_ptr,
1.390 + font);
1.391 +
1.392 + case HB_BUFFER_SERIALIZE_FORMAT_JSON:
1.393 + return _hb_buffer_deserialize_glyphs_json (buffer,
1.394 + buf, buf_len, end_ptr,
1.395 + font);
1.396 +
1.397 + default:
1.398 + case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
1.399 + return false;
1.400 +
1.401 + }
1.402 +}
