1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /***************************************************************************
4 *
5 * Copyright (C) 1998-2014, International Business Machines
6 * Corporation and others. All Rights Reserved.
7 *
8 ************************************************************************/
9
10 #include "layout/LETypes.h"
11 #include "layout/LESwaps.h"
12
13 #include "sfnt.h"
14 #include "cmaps.h"
15 #include <stdio.h>
16
17 #define SWAPU16(code) ((LEUnicode16) SWAPW(code))
18 #define SWAPU32(code) ((LEUnicode32) SWAPL(code))
19
20 //
21 // Finds the high bit by binary searching
22 // through the bits in value.
23 //
highBit(le_uint32 value)24 le_int8 highBit(le_uint32 value)
25 {
26 le_uint8 bit = 0;
27
28 if (value >= 1 << 16) {
29 value >>= 16;
30 bit += 16;
31 }
32
33 if (value >= 1 << 8) {
34 value >>= 8;
35 bit += 8;
36 }
37
38 if (value >= 1 << 4) {
39 value >>= 4;
40 bit += 4;
41 }
42
43 if (value >= 1 << 2) {
44 value >>= 2;
45 bit += 2;
46 }
47
48 if (value >= 1 << 1) {
49 value >>= 1;
50 bit += 1;
51 }
52
53 return bit;
54 }
55
createUnicodeMapper(const CMAPTable * cmap)56 CMAPMapper *CMAPMapper::createUnicodeMapper(const CMAPTable *cmap)
57 {
58 le_uint16 i;
59 le_uint16 nSubtables = SWAPW(cmap->numberSubtables);
60 const CMAPEncodingSubtable *subtable = NULL;
61 le_bool found = FALSE;
62 le_uint16 foundPlatformID = 0xFFFF;
63 le_uint16 foundPlatformSpecificID = 0xFFFF;
64 le_uint32 foundOffset = 0;
65 le_uint16 foundTable = 0xFFFF;
66 // first pass, look for MS table. (preferred?)
67 for (i = 0; i < nSubtables && !found; i += 1) {
68 const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
69
70 le_uint16 platformID = SWAPW(esh->platformID);
71 le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
72 if (platformID == 3) { // microsoft
73 switch (platformSpecificID) {
74 case 1: // Unicode BMP (UCS-2)
75 case 10: // Unicode UCS-4
76 foundOffset = SWAPL(esh->encodingOffset);
77 foundPlatformID = platformID;
78 foundPlatformSpecificID = platformSpecificID;
79 found = TRUE;
80 foundTable = i;
81 break;
82
83 //default:
84 // printf("%s:%d: microsoft (3) platform specific ID %d (wanted 1 or 10) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformSpecificID)), i, nSubtables);
85 }
86 } else {
87 //printf("%s:%d: platform ID %d (wanted 3, microsoft) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformID)), i, nSubtables);
88 }
89 }
90
91 // second pass, allow non MS table
92 // first pass, look for MS table. (preferred?)
93 for (i = 0; i < nSubtables && !found; i += 1) {
94 const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
95 le_uint16 platformID = SWAPW(esh->platformID);
96 le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
97 //printf("%s:%d: table %d/%d has platform:specific %d:%d\n", __FILE__, __LINE__, i, nSubtables, platformID, platformSpecificID);
98 switch(platformID) {
99 case 0: // Unicode platform
100 switch(platformSpecificID) {
101 case 0:
102 case 1:
103 case 2:
104 case 3:
105 foundOffset = SWAPL(esh->encodingOffset);
106 foundPlatformID = platformID;
107 foundPlatformSpecificID = platformSpecificID;
108 foundTable = i;
109 found = TRUE;
110 break;
111
112 default: printf("Error: table %d (psid %d) is unknown. Skipping.\n", i, platformSpecificID); break;
113 }
114 break;
115
116 //default:
117 //printf("Skipping platform id %d\n", platformID);
118 }
119 }
120
121
122 if (found)
123 {
124 subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + foundOffset);
125 //printf("%s:%d: using subtable #%d/%d type %d:%d\n", __FILE__, __LINE__, foundTable, nSubtables, foundPlatformID, foundPlatformSpecificID);
126 (void)foundPlatformID; // Suppress unused variable compiler warnings.
127 (void)foundTable;
128 (void)foundPlatformSpecificID;
129 } else {
130 printf("%s:%d: could not find subtable.\n", __FILE__, __LINE__);
131 return NULL;
132 }
133
134 le_uint16 tableFormat = SWAPW(subtable->format);
135 //printf("%s:%d: table format %d\n", __FILE__, __LINE__, tableFormat);
136
137 switch (tableFormat) {
138 case 4:
139 return new CMAPFormat4Mapper(cmap, (const CMAPFormat4Encoding *) subtable);
140
141 case 12:
142 {
143 const CMAPFormat12Encoding *encoding = (const CMAPFormat12Encoding *) subtable;
144
145 return new CMAPGroupMapper(cmap, encoding->groups, SWAPL(encoding->nGroups));
146 }
147
148 default:
149 break;
150 }
151
152 printf("%s:%d: Unknown format %x.\n", __FILE__, __LINE__, (SWAPW(subtable->format)));
153 return NULL;
154 }
155
CMAPFormat4Mapper(const CMAPTable * cmap,const CMAPFormat4Encoding * header)156 CMAPFormat4Mapper::CMAPFormat4Mapper(const CMAPTable *cmap, const CMAPFormat4Encoding *header)
157 : CMAPMapper(cmap)
158 {
159 le_uint16 segCount = SWAPW(header->segCountX2) / 2;
160
161 fEntrySelector = SWAPW(header->entrySelector);
162 fRangeShift = SWAPW(header->rangeShift) / 2;
163 fEndCodes = &header->endCodes[0];
164 fStartCodes = &header->endCodes[segCount + 1]; // + 1 for reservedPad...
165 fIdDelta = &fStartCodes[segCount];
166 fIdRangeOffset = &fIdDelta[segCount];
167 }
168
unicodeToGlyph(LEUnicode32 unicode32) const169 LEGlyphID CMAPFormat4Mapper::unicodeToGlyph(LEUnicode32 unicode32) const
170 {
171 if (unicode32 >= 0x10000) {
172 return 0;
173 }
174
175 LEUnicode16 unicode = (LEUnicode16) unicode32;
176 le_uint16 index = 0;
177 le_uint16 probe = 1 << fEntrySelector;
178 TTGlyphID result = 0;
179
180 if (SWAPU16(fStartCodes[fRangeShift]) <= unicode) {
181 index = fRangeShift;
182 }
183
184 while (probe > (1 << 0)) {
185 probe >>= 1;
186
187 if (SWAPU16(fStartCodes[index + probe]) <= unicode) {
188 index += probe;
189 }
190 }
191
192 if (unicode >= SWAPU16(fStartCodes[index]) && unicode <= SWAPU16(fEndCodes[index])) {
193 if (fIdRangeOffset[index] == 0) {
194 result = (TTGlyphID) unicode;
195 } else {
196 le_uint16 offset = unicode - SWAPU16(fStartCodes[index]);
197 le_uint16 rangeOffset = SWAPW(fIdRangeOffset[index]);
198 le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &fIdRangeOffset[index] + rangeOffset);
199
200 result = SWAPW(glyphIndexTable[offset]);
201 }
202
203 result += SWAPW(fIdDelta[index]);
204 } else {
205 result = 0;
206 }
207
208 return LE_SET_GLYPH(0, result);
209 }
210
~CMAPFormat4Mapper()211 CMAPFormat4Mapper::~CMAPFormat4Mapper()
212 {
213 // parent destructor does it all
214 }
215
CMAPGroupMapper(const CMAPTable * cmap,const CMAPGroup * groups,le_uint32 nGroups)216 CMAPGroupMapper::CMAPGroupMapper(const CMAPTable *cmap, const CMAPGroup *groups, le_uint32 nGroups)
217 : CMAPMapper(cmap), fGroups(groups)
218 {
219 le_uint8 bit = highBit(nGroups);
220 fPower = 1 << bit;
221 fRangeOffset = nGroups - fPower;
222 }
223
unicodeToGlyph(LEUnicode32 unicode32) const224 LEGlyphID CMAPGroupMapper::unicodeToGlyph(LEUnicode32 unicode32) const
225 {
226 le_int32 probe = fPower;
227 le_int32 range = 0;
228
229 if (SWAPU32(fGroups[fRangeOffset].startCharCode) <= unicode32) {
230 range = fRangeOffset;
231 }
232
233 while (probe > (1 << 0)) {
234 probe >>= 1;
235
236 if (SWAPU32(fGroups[range + probe].startCharCode) <= unicode32) {
237 range += probe;
238 }
239 }
240
241 if (SWAPU32(fGroups[range].startCharCode) <= unicode32 && SWAPU32(fGroups[range].endCharCode) >= unicode32) {
242 return (LEGlyphID) (SWAPU32(fGroups[range].startGlyphCode) + unicode32 - SWAPU32(fGroups[range].startCharCode));
243 }
244
245 return 0;
246 }
247
~CMAPGroupMapper()248 CMAPGroupMapper::~CMAPGroupMapper()
249 {
250 // parent destructor does it all
251 }
252
253