1 /*
2 * Copyright © 2018 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.hh"
28
29 #include "hb-ot-name-table.hh"
30
31 #include "hb-ot-face.hh"
32 #include "hb-utf.hh"
33
34
35 /**
36 * SECTION:hb-ot-name
37 * @title: hb-ot-name
38 * @short_description: OpenType font name information
39 * @include: hb-ot.h
40 *
41 * Functions for fetching name strings from OpenType fonts.
42 **/
43
44
45 /**
46 * hb_ot_name_list_names:
47 * @face: font face.
48 * @num_entries: (out) (allow-none): number of returned entries.
49 *
50 * Enumerates all available name IDs and language combinations. Returned
51 * array is owned by the @face and should not be modified. It can be
52 * used as long as @face is alive.
53 *
54 * Returns: (out) (transfer none) (array length=num_entries): Array of available name entries.
55 * Since: 2.1.0
56 **/
57 const hb_ot_name_entry_t *
58 hb_ot_name_list_names (hb_face_t *face,
59 unsigned int *num_entries /* OUT */)
60 {
61 const OT::name_accelerator_t &name = *face->table.name;
62 if (num_entries) *num_entries = name.names.length;
63 return (const hb_ot_name_entry_t *) name.names;
64 }
65
66
67 template <typename in_utf_t, typename out_utf_t>
68 static inline unsigned int
69 hb_ot_name_convert_utf (hb_bytes_t bytes,
70 unsigned int *text_size /* IN/OUT */,
71 typename out_utf_t::codepoint_t *text /* OUT */)
72 {
73 unsigned int src_len = bytes.length / sizeof (typename in_utf_t::codepoint_t);
74 const typename in_utf_t::codepoint_t *src = (const typename in_utf_t::codepoint_t *) bytes.arrayZ;
75 const typename in_utf_t::codepoint_t *src_end = src + src_len;
76
77 typename out_utf_t::codepoint_t *dst = text;
78
79 hb_codepoint_t unicode;
80 const hb_codepoint_t replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
81
82 if (text_size && *text_size)
83 {
84 (*text_size)--; /* Same room for NUL-termination. */
85 const typename out_utf_t::codepoint_t *dst_end = text + *text_size;
86
87 while (src < src_end && dst < dst_end)
88 {
89 const typename in_utf_t::codepoint_t *src_next = in_utf_t::next (src, src_end, &unicode, replacement);
90 typename out_utf_t::codepoint_t *dst_next = out_utf_t::encode (dst, dst_end, unicode);
91 if (dst_next == dst)
92 break; /* Out-of-room. */
93
94 dst = dst_next;
95 src = src_next;
96 };
97
98 *text_size = dst - text;
99 *dst = 0; /* NUL-terminate. */
100 }
101
102 /* Accumulate length of rest. */
103 unsigned int dst_len = dst - text;
104 while (src < src_end)
105 {
106 src = in_utf_t::next (src, src_end, &unicode, replacement);
107 dst_len += out_utf_t::encode_len (unicode);
108 };
109 return dst_len;
110 }
111
112 template <typename utf_t>
113 static inline unsigned int
114 hb_ot_name_get_utf (hb_face_t *face,
115 hb_ot_name_id_t name_id,
116 hb_language_t language,
117 unsigned int *text_size /* IN/OUT */,
118 typename utf_t::codepoint_t *text /* OUT */)
119 {
120 const OT::name_accelerator_t &name = *face->table.name;
121
122 if (!language)
123 language = hb_language_from_string ("en", 2);
124
125 unsigned int width;
126 int idx = name.get_index (name_id, language, &width);
127 if (idx != -1)
128 {
129 hb_bytes_t bytes = name.get_name (idx);
130
131 if (width == 2) /* UTF16-BE */
132 return hb_ot_name_convert_utf<hb_utf16_be_t, utf_t> (bytes, text_size, text);
133
134 if (width == 1) /* ASCII */
135 return hb_ot_name_convert_utf<hb_ascii_t, utf_t> (bytes, text_size, text);
136 }
137
138 if (text_size)
139 {
140 if (*text_size)
141 *text = 0;
142 *text_size = 0;
143 }
144 return 0;
145 }
146
147 /**
148 * hb_ot_name_get_utf8:
149 * @face: font face.
150 * @name_id: OpenType name identifier to fetch.
151 * @language: language to fetch the name for.
152 * @text_size: (inout) (allow-none): input size of @text buffer, and output size of
153 * text written to buffer.
154 * @text: (out caller-allocates) (array length=text_size): buffer to write fetched name into.
155 *
156 * Fetches a font name from the OpenType 'name' table.
157 * If @language is #HB_LANGUAGE_INVALID, English ("en") is assumed.
158 * Returns string in UTF-8 encoding.
159 *
160 * Returns: full length of the requested string, or 0 if not found.
161 * Since: 2.1.0
162 **/
163 unsigned int
164 hb_ot_name_get_utf8 (hb_face_t *face,
165 hb_ot_name_id_t name_id,
166 hb_language_t language,
167 unsigned int *text_size /* IN/OUT */,
168 char *text /* OUT */)
169 {
170 return hb_ot_name_get_utf<hb_utf8_t> (face, name_id, language, text_size,
171 (hb_utf8_t::codepoint_t *) text);
172 }
173
174 /**
175 * hb_ot_name_get_utf16:
176 * @face: font face.
177 * @name_id: OpenType name identifier to fetch.
178 * @language: language to fetch the name for.
179 * @text_size: (inout) (allow-none): input size of @text buffer, and output size of
180 * text written to buffer.
181 * @text: (out caller-allocates) (array length=text_size): buffer to write fetched name into.
182 *
183 * Fetches a font name from the OpenType 'name' table.
184 * If @language is #HB_LANGUAGE_INVALID, English ("en") is assumed.
185 * Returns string in UTF-16 encoding.
186 *
187 * Returns: full length of the requested string, or 0 if not found.
188 * Since: 2.1.0
189 **/
190 unsigned int
191 hb_ot_name_get_utf16 (hb_face_t *face,
192 hb_ot_name_id_t name_id,
193 hb_language_t language,
194 unsigned int *text_size /* IN/OUT */,
195 uint16_t *text /* OUT */)
196 {
197 return hb_ot_name_get_utf<hb_utf16_t> (face, name_id, language, text_size, text);
198 }
199
200 /**
201 * hb_ot_name_get_utf32:
202 * @face: font face.
203 * @name_id: OpenType name identifier to fetch.
204 * @language: language to fetch the name for.
205 * @text_size: (inout) (allow-none): input size of @text buffer, and output size of
206 * text written to buffer.
207 * @text: (out caller-allocates) (array length=text_size): buffer to write fetched name into.
208 *
209 * Fetches a font name from the OpenType 'name' table.
210 * If @language is #HB_LANGUAGE_INVALID, English ("en") is assumed.
211 * Returns string in UTF-32 encoding.
212 *
213 * Returns: full length of the requested string, or 0 if not found.
214 * Since: 2.1.0
215 **/
216 unsigned int
217 hb_ot_name_get_utf32 (hb_face_t *face,
218 hb_ot_name_id_t name_id,
219 hb_language_t language,
220 unsigned int *text_size /* IN/OUT */,
221 uint32_t *text /* OUT */)
222 {
223 return hb_ot_name_get_utf<hb_utf32_t> (face, name_id, language, text_size, text);
224 }