1 /*
2 * Copyright © 2012,2013 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27 #include "hb-buffer-private.hh"
28
29
30 static const char *serialize_formats[] = {
31 "text",
32 "json",
33 NULL
34 };
35
36 const char **
hb_buffer_serialize_list_formats(void)37 hb_buffer_serialize_list_formats (void)
38 {
39 return serialize_formats;
40 }
41
42 hb_buffer_serialize_format_t
hb_buffer_serialize_format_from_string(const char * str,int len)43 hb_buffer_serialize_format_from_string (const char *str, int len)
44 {
45 /* Upper-case it. */
46 return (hb_buffer_serialize_format_t) (hb_tag_from_string (str, len) & ~0x20202020);
47 }
48
49 const char *
hb_buffer_serialize_format_to_string(hb_buffer_serialize_format_t format)50 hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format)
51 {
52 switch (format)
53 {
54 case HB_BUFFER_SERIALIZE_FORMAT_TEXT: return serialize_formats[0];
55 case HB_BUFFER_SERIALIZE_FORMAT_JSON: return serialize_formats[1];
56 default:
57 case HB_BUFFER_SERIALIZE_FORMAT_INVALID: return NULL;
58 }
59 }
60
61 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)62 _hb_buffer_serialize_glyphs_json (hb_buffer_t *buffer,
63 unsigned int start,
64 unsigned int end,
65 char *buf,
66 unsigned int buf_size,
67 unsigned int *buf_consumed,
68 hb_font_t *font,
69 hb_buffer_serialize_flags_t flags)
70 {
71 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
72 hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
73
74 *buf_consumed = 0;
75 for (unsigned int i = start; i < end; i++)
76 {
77 char b[1024];
78 char *p = b;
79
80 /* In the following code, we know b is large enough that no overflow can happen. */
81
82 #define APPEND(s) HB_STMT_START { strcpy (p, s); p += strlen (s); } HB_STMT_END
83
84 if (i)
85 *p++ = ',';
86
87 *p++ = '{';
88
89 APPEND ("\"g\":");
90 if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
91 {
92 char g[128];
93 hb_font_glyph_to_string (font, info[i].codepoint, g, sizeof (g));
94 *p++ = '"';
95 for (char *q = g; *q; q++) {
96 if (*q == '"')
97 *p++ = '\\';
98 *p++ = *q;
99 }
100 *p++ = '"';
101 }
102 else
103 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint);
104
105 if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
106 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"cl\":%u", info[i].cluster);
107 }
108
109 if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
110 {
111 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"dx\":%d,\"dy\":%d",
112 pos[i].x_offset, pos[i].y_offset);
113 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"ax\":%d,\"ay\":%d",
114 pos[i].x_advance, pos[i].y_advance);
115 }
116
117 *p++ = '}';
118
119 if (buf_size > (p - b))
120 {
121 unsigned int l = p - b;
122 memcpy (buf, b, l);
123 buf += l;
124 buf_size -= l;
125 *buf_consumed += l;
126 *buf = '\0';
127 } else
128 return i - start;
129 }
130
131 return end - start;
132 }
133
134 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)135 _hb_buffer_serialize_glyphs_text (hb_buffer_t *buffer,
136 unsigned int start,
137 unsigned int end,
138 char *buf,
139 unsigned int buf_size,
140 unsigned int *buf_consumed,
141 hb_font_t *font,
142 hb_buffer_serialize_flags_t flags)
143 {
144 hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
145 hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
146
147 *buf_consumed = 0;
148 for (unsigned int i = start; i < end; i++)
149 {
150 char b[1024];
151 char *p = b;
152
153 /* In the following code, we know b is large enough that no overflow can happen. */
154
155 if (i)
156 *p++ = '|';
157
158 if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
159 {
160 hb_font_glyph_to_string (font, info[i].codepoint, p, 128);
161 p += strlen (p);
162 }
163 else
164 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint);
165
166 if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
167 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "=%u", info[i].cluster);
168 }
169
170 if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
171 {
172 if (pos[i].x_offset || pos[i].y_offset)
173 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "@%d,%d", pos[i].x_offset, pos[i].y_offset);
174
175 *p++ = '+';
176 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%d", pos[i].x_advance);
177 if (pos->y_advance)
178 p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",%d", pos[i].y_advance);
179 }
180
181 if (buf_size > (p - b))
182 {
183 unsigned int l = p - b;
184 memcpy (buf, b, l);
185 buf += l;
186 buf_size -= l;
187 *buf_consumed += l;
188 *buf = '\0';
189 } else
190 return i - start;
191 }
192
193 return end - start;
194 }
195
196 /* Returns number of items, starting at start, that were serialized. */
197 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)198 hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
199 unsigned int start,
200 unsigned int end,
201 char *buf,
202 unsigned int buf_size,
203 unsigned int *buf_consumed, /* May be NULL */
204 hb_font_t *font, /* May be NULL */
205 hb_buffer_serialize_format_t format,
206 hb_buffer_serialize_flags_t flags)
207 {
208 assert (start <= end && end <= buffer->len);
209
210 unsigned int sconsumed;
211 if (!buf_consumed)
212 buf_consumed = &sconsumed;
213 *buf_consumed = 0;
214
215 assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
216 buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
217
218 if (unlikely (start == end))
219 return 0;
220
221 if (!font)
222 font = hb_font_get_empty ();
223
224 switch (format)
225 {
226 case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
227 return _hb_buffer_serialize_glyphs_text (buffer, start, end,
228 buf, buf_size, buf_consumed,
229 font, flags);
230
231 case HB_BUFFER_SERIALIZE_FORMAT_JSON:
232 return _hb_buffer_serialize_glyphs_json (buffer, start, end,
233 buf, buf_size, buf_consumed,
234 font, flags);
235
236 default:
237 case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
238 return 0;
239
240 }
241 }
242
243
244 static hb_bool_t
parse_uint(const char * pp,const char * end,uint32_t * pv)245 parse_uint (const char *pp, const char *end, uint32_t *pv)
246 {
247 char buf[32];
248 unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
249 strncpy (buf, pp, len);
250 buf[len] = '\0';
251
252 char *p = buf;
253 char *pend = p;
254 uint32_t v;
255
256 errno = 0;
257 v = strtol (p, &pend, 10);
258 if (errno || p == pend || pend - p != end - pp)
259 return false;
260
261 *pv = v;
262 return true;
263 }
264
265 static hb_bool_t
parse_int(const char * pp,const char * end,int32_t * pv)266 parse_int (const char *pp, const char *end, int32_t *pv)
267 {
268 char buf[32];
269 unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - pp));
270 strncpy (buf, pp, len);
271 buf[len] = '\0';
272
273 char *p = buf;
274 char *pend = p;
275 int32_t v;
276
277 errno = 0;
278 v = strtol (p, &pend, 10);
279 if (errno || p == pend || pend - p != end - pp)
280 return false;
281
282 *pv = v;
283 return true;
284 }
285
286 #include "hb-buffer-deserialize-json.hh"
287 #include "hb-buffer-deserialize-text.hh"
288
289 hb_bool_t
hb_buffer_deserialize_glyphs(hb_buffer_t * buffer,const char * buf,int buf_len,const char ** end_ptr,hb_font_t * font,hb_buffer_serialize_format_t format)290 hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
291 const char *buf,
292 int buf_len, /* -1 means nul-terminated */
293 const char **end_ptr, /* May be NULL */
294 hb_font_t *font, /* May be NULL */
295 hb_buffer_serialize_format_t format)
296 {
297 const char *end;
298 if (!end_ptr)
299 end_ptr = &end;
300 *end_ptr = buf;
301
302 assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
303 buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
304
305 if (buf_len == -1)
306 buf_len = strlen (buf);
307
308 if (!buf_len)
309 {
310 *end_ptr = buf;
311 return false;
312 }
313
314 hb_buffer_set_content_type (buffer, HB_BUFFER_CONTENT_TYPE_GLYPHS);
315
316 if (!font)
317 font = hb_font_get_empty ();
318
319 switch (format)
320 {
321 case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
322 return _hb_buffer_deserialize_glyphs_text (buffer,
323 buf, buf_len, end_ptr,
324 font);
325
326 case HB_BUFFER_SERIALIZE_FORMAT_JSON:
327 return _hb_buffer_deserialize_glyphs_json (buffer,
328 buf, buf_len, end_ptr,
329 font);
330
331 default:
332 case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
333 return false;
334
335 }
336 }
337