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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Pdf\Build\Font; |
| 16 | |
| 17 | use Pop\Pdf\Build\PdfObject\StreamObject; |
| 18 | |
| 19 | /** |
| 20 | * Pdf font parser class |
| 21 | * |
| 22 | * @category Pop |
| 23 | * @package Pop\Pdf |
| 24 | * @author Nick Sagona, III <nick@popphp.org> |
| 25 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 26 | * @license https://www.popphp.org/license New BSD License |
| 27 | * @version 6.0.0 |
| 28 | */ |
| 29 | class Parser |
| 30 | { |
| 31 | |
| 32 | /** |
| 33 | * Font object |
| 34 | * @var Type1|TrueType|null |
| 35 | */ |
| 36 | protected Type1|TrueType|null $font = null; |
| 37 | |
| 38 | /** |
| 39 | * Font reference index |
| 40 | * @var ?int |
| 41 | */ |
| 42 | protected ?int $fontIndex = null; |
| 43 | |
| 44 | /** |
| 45 | * Font object index |
| 46 | * @var ?int |
| 47 | */ |
| 48 | protected ?int $fontObjectIndex = null; |
| 49 | |
| 50 | /** |
| 51 | * Font descriptor index |
| 52 | * @var ?int |
| 53 | */ |
| 54 | protected ?int $fontDescIndex = null; |
| 55 | |
| 56 | /** |
| 57 | * Font file index |
| 58 | * @var ?int |
| 59 | */ |
| 60 | protected ?int $fontFileIndex = null; |
| 61 | |
| 62 | /** |
| 63 | * CID (descendant) font object index |
| 64 | * @var ?int |
| 65 | */ |
| 66 | protected ?int $cidFontObjectIndex = null; |
| 67 | |
| 68 | /** |
| 69 | * ToUnicode CMap stream object index |
| 70 | * @var ?int |
| 71 | */ |
| 72 | protected ?int $toUnicodeIndex = null; |
| 73 | |
| 74 | /** |
| 75 | * Font objects |
| 76 | * @var array |
| 77 | */ |
| 78 | protected array $objects = []; |
| 79 | |
| 80 | /** |
| 81 | * Font compression flag |
| 82 | * @var bool |
| 83 | */ |
| 84 | protected bool $compression = false; |
| 85 | |
| 86 | /** |
| 87 | * Constructor |
| 88 | * |
| 89 | * Instantiate a font parser object |
| 90 | * |
| 91 | * @param string $fontFile |
| 92 | * @param bool $compression |
| 93 | * @throws Exception|\Pop\Utils\Exception |
| 94 | */ |
| 95 | public function __construct(string $fontFile, bool $compression = false) |
| 96 | { |
| 97 | $ext = strtolower(substr($fontFile, (strrpos($fontFile, '.') + 1))); |
| 98 | switch ($ext) { |
| 99 | case 'ttf': |
| 100 | $this->font = new TrueType($fontFile); |
| 101 | break; |
| 102 | case 'otf': |
| 103 | $this->font = new TrueType\OpenType($fontFile); |
| 104 | break; |
| 105 | case 'pfb': |
| 106 | $this->font = new Type1($fontFile); |
| 107 | if ($this->font->afmPath === null) { |
| 108 | throw new Exception('The AFM font file was not found.'); |
| 109 | } |
| 110 | break; |
| 111 | default: |
| 112 | throw new Exception('That font type is not supported.'); |
| 113 | } |
| 114 | |
| 115 | $this->setCompression($compression); |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Load font from stream |
| 120 | * |
| 121 | * @param string $stream |
| 122 | * @return void |
| 123 | */ |
| 124 | public static function loadFromStream(string $stream): void |
| 125 | { |
| 126 | // TO-DO |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Set the font index |
| 131 | * |
| 132 | * @param int $index |
| 133 | * @return Parser |
| 134 | */ |
| 135 | public function setFontIndex(int $index): Parser |
| 136 | { |
| 137 | $this->fontIndex = $index; |
| 138 | return $this; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Set the font object index |
| 143 | * |
| 144 | * @param int $index |
| 145 | * @return Parser |
| 146 | */ |
| 147 | public function setFontObjectIndex(int $index): Parser |
| 148 | { |
| 149 | $this->fontObjectIndex = $index; |
| 150 | return $this; |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Set the font descriptor index |
| 155 | * |
| 156 | * @param int $index |
| 157 | * @return Parser |
| 158 | */ |
| 159 | public function setFontDescIndex(int $index): Parser |
| 160 | { |
| 161 | $this->fontDescIndex = $index; |
| 162 | return $this; |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * Set the font file index |
| 167 | * |
| 168 | * @param int $index |
| 169 | * @return Parser |
| 170 | */ |
| 171 | public function setFontFileIndex(int $index): Parser |
| 172 | { |
| 173 | $this->fontFileIndex = $index; |
| 174 | return $this; |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Set the CID (descendant) font object index |
| 179 | * |
| 180 | * @param int $index |
| 181 | * @return Parser |
| 182 | */ |
| 183 | public function setCidFontObjectIndex(int $index): Parser |
| 184 | { |
| 185 | $this->cidFontObjectIndex = $index; |
| 186 | return $this; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Set the ToUnicode CMap stream object index |
| 191 | * |
| 192 | * @param int $index |
| 193 | * @return Parser |
| 194 | */ |
| 195 | public function setToUnicodeIndex(int $index): Parser |
| 196 | { |
| 197 | $this->toUnicodeIndex = $index; |
| 198 | return $this; |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Set the compression |
| 203 | * |
| 204 | * @param bool $compression |
| 205 | * @return Parser |
| 206 | */ |
| 207 | public function setCompression(bool $compression): Parser |
| 208 | { |
| 209 | $this->compression = $compression; |
| 210 | return $this; |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * Get the font object |
| 215 | * |
| 216 | * @return ?AbstractFont |
| 217 | */ |
| 218 | public function getFont(): ?AbstractFont |
| 219 | { |
| 220 | return $this->font; |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Get the font index |
| 225 | * |
| 226 | * @return ?int |
| 227 | */ |
| 228 | public function getFontIndex(): ?int |
| 229 | { |
| 230 | return $this->fontIndex; |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * Get the font object index |
| 235 | * |
| 236 | * @return ?int |
| 237 | */ |
| 238 | public function getFontObjectIndex(): ?int |
| 239 | { |
| 240 | return $this->fontObjectIndex; |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * Get the font descriptor index |
| 245 | * |
| 246 | * @return ?int |
| 247 | */ |
| 248 | public function getFontDescIndex(): ?int |
| 249 | { |
| 250 | return $this->fontDescIndex; |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Get the font file index |
| 255 | * |
| 256 | * @return ?int |
| 257 | */ |
| 258 | public function getFontFileIndex(): ?int |
| 259 | { |
| 260 | return $this->fontFileIndex; |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Get the CID (descendant) font object index |
| 265 | * |
| 266 | * @return ?int |
| 267 | */ |
| 268 | public function getCidFontObjectIndex(): ?int |
| 269 | { |
| 270 | return $this->cidFontObjectIndex; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * Get the ToUnicode CMap stream object index |
| 275 | * |
| 276 | * @return ?int |
| 277 | */ |
| 278 | public function getToUnicodeIndex(): ?int |
| 279 | { |
| 280 | return $this->toUnicodeIndex; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Get the font objects |
| 285 | * |
| 286 | * @return array |
| 287 | */ |
| 288 | public function getObjects(): array |
| 289 | { |
| 290 | if (count($this->objects) == 0) { |
| 291 | $this->parse(); |
| 292 | } |
| 293 | return $this->objects; |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * Method to get the font reference. |
| 298 | * |
| 299 | * @return string |
| 300 | */ |
| 301 | public function getFontReference(): string |
| 302 | { |
| 303 | return "/TT{$this->fontIndex} {$this->fontObjectIndex} 0 R"; |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * Method to get the font name. |
| 308 | * |
| 309 | * @return string |
| 310 | */ |
| 311 | public function getFontName(): string |
| 312 | { |
| 313 | if ($this->font instanceof Type1) { |
| 314 | return $this->font->info->postscriptName; |
| 315 | } elseif ($this->font instanceof TrueType) { |
| 316 | return $this->font->tables['name']->postscriptName; |
| 317 | } |
| 318 | |
| 319 | throw new Exception('Error: The font type is not supported.'); |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Method to get if the font is embeddable. |
| 324 | * |
| 325 | * @return bool |
| 326 | */ |
| 327 | public function isEmbeddable(): bool |
| 328 | { |
| 329 | return $this->font->embeddable; |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * Get whether or not the font objects are compressed |
| 334 | * |
| 335 | * @return bool |
| 336 | */ |
| 337 | public function isCompressed(): bool |
| 338 | { |
| 339 | return $this->compression; |
| 340 | } |
| 341 | |
| 342 | /** |
| 343 | * Parse the font data and create the font objects |
| 344 | * |
| 345 | * @throws Exception |
| 346 | * @return void |
| 347 | */ |
| 348 | public function parse(): void |
| 349 | { |
| 350 | if (($this->fontIndex === null) || ($this->fontObjectIndex === null) || |
| 351 | ($this->fontDescIndex === null) || ($this->fontFileIndex === null)) { |
| 352 | throw new Exception('Error: The font indices are not set'); |
| 353 | } |
| 354 | |
| 355 | if ($this->font instanceof Type1) { |
| 356 | $fontType = 'Type1'; |
| 357 | $fontName = $this->font->info->postscriptName; |
| 358 | $fontFile = 'FontFile'; |
| 359 | $glyphWidths = ['encoding' => 'StandardEncoding', 'widths' => $this->font->glyphWidths]; |
| 360 | $unCompStream = $this->font->fontData; |
| 361 | $length1 = $this->font->length1; |
| 362 | $length2 = " /Length2 " . $this->font->length2 . " /Length3 0"; |
| 363 | |
| 364 | $this->objects[$this->fontObjectIndex] = StreamObject::parse( |
| 365 | "{$this->fontObjectIndex} 0 obj\n<<\n /Type /Font\n /Subtype /{$fontType}\n /FontDescriptor " . |
| 366 | $this->fontDescIndex . " 0 R\n /Name /TT{$this->fontIndex}\n /BaseFont /" . $fontName . |
| 367 | "\n /FirstChar 32\n /LastChar 255\n /Widths [" . implode(' ', $glyphWidths['widths']) . |
| 368 | "]\n /Encoding /" . $glyphWidths['encoding'] . "\n>>\nendobj\n\n" |
| 369 | ); |
| 370 | } elseif ($this->font instanceof TrueType) { |
| 371 | if (($this->cidFontObjectIndex === null) || ($this->toUnicodeIndex === null)) { |
| 372 | throw new Exception('Error: The CID font indices are not set'); |
| 373 | } |
| 374 | |
| 375 | $fontName = $this->font->tables['name']->postscriptName; |
| 376 | $fontFile = 'FontFile2'; |
| 377 | $unCompStream = $this->font->read(); |
| 378 | $length1 = strlen($unCompStream); |
| 379 | $length2 = null; |
| 380 | |
| 381 | $this->objects[$this->fontObjectIndex] = StreamObject::parse( |
| 382 | "{$this->fontObjectIndex} 0 obj\n<<\n /Type /Font\n /Subtype /Type0\n /Name /TT{$this->fontIndex}\n /BaseFont /" . |
| 383 | $fontName . "\n /Encoding /Identity-H\n /DescendantFonts [" . $this->cidFontObjectIndex . |
| 384 | " 0 R]\n /ToUnicode " . $this->toUnicodeIndex . " 0 R\n>>\nendobj\n\n" |
| 385 | ); |
| 386 | |
| 387 | $this->objects[$this->cidFontObjectIndex] = StreamObject::parse( |
| 388 | "{$this->cidFontObjectIndex} 0 obj\n<<\n /Type /Font\n /Subtype /CIDFontType2\n /BaseFont /" . |
| 389 | $fontName . "\n /CIDSystemInfo <</Registry (Adobe) /Ordering (Identity) /Supplement 0>>\n /FontDescriptor " . |
| 390 | $this->fontDescIndex . " 0 R\n /CIDToGIDMap /Identity\n /DW " . $this->font->missingWidth . |
| 391 | "\n /W [" . $this->buildCidWidths($this->font) . "]\n>>\nendobj\n\n" |
| 392 | ); |
| 393 | |
| 394 | $this->objects[$this->toUnicodeIndex] = StreamObject::parse($this->buildToUnicodeCMap($this->font)); |
| 395 | } else { |
| 396 | throw new Exception('Error: The font type is not supported.'); |
| 397 | } |
| 398 | |
| 399 | $bBox = '[' . $this->font->bBox->xMin . ' ' . $this->font->bBox->yMin . ' ' . |
| 400 | $this->font->bBox->xMax . ' ' . $this->font->bBox->yMax . ']'; |
| 401 | |
| 402 | if (($this->compression) && function_exists('gzcompress')) { |
| 403 | $compStream = gzcompress($unCompStream, 9); |
| 404 | $fontFileObj = "{$this->fontFileIndex} 0 obj\n<</Length " . strlen($compStream) . |
| 405 | " /Filter /FlateDecode /Length1 " . $length1 . $length2 . ">>\nstream\n" . $compStream . "\nendstream\nendobj\n\n"; |
| 406 | } else { |
| 407 | $fontFileObj = "{$this->fontFileIndex} 0 obj\n<</Length " . strlen($unCompStream) . " /Length1 " . |
| 408 | $length1 . $length2 . ">>\nstream\n" . $unCompStream . "\nendstream\nendobj\n\n"; |
| 409 | } |
| 410 | |
| 411 | $this->objects[$this->fontDescIndex] = StreamObject::parse( |
| 412 | "{$this->fontDescIndex} 0 obj\n<<\n /Type /FontDescriptor\n /FontName /" . $fontName . |
| 413 | "\n /{$fontFile} {$this->fontFileIndex} 0 R\n /MissingWidth {$this->font->missingWidth}\n /StemV " . |
| 414 | $this->font->stemV . "\n /Flags " . $this->font->calcFlags() . "\n /FontBBox {$bBox}\n /Descent " . |
| 415 | $this->font->descent . "\n /Ascent {$this->font->ascent}\n /CapHeight " . $this->font->capHeight . |
| 416 | "\n /ItalicAngle {$this->font->italicAngle}\n>>\nendobj\n\n" |
| 417 | ); |
| 418 | |
| 419 | $this->objects[$this->fontFileIndex] = StreamObject::parse($fontFileObj); |
| 420 | } |
| 421 | |
| 422 | /** |
| 423 | * Build the /W (per-CID width) array for a CID font from GID-indexed glyph widths |
| 424 | * |
| 425 | * hmtx-derived glyph widths are already contiguous from GID 0, so this |
| 426 | * emits a single 'c [w1 w2 ... wn]' run rather than detecting ranges. |
| 427 | * |
| 428 | * @param TrueType $font |
| 429 | * @return string |
| 430 | */ |
| 431 | protected function buildCidWidths(TrueType $font): string |
| 432 | { |
| 433 | return '0 [' . implode(' ', $font->glyphWidths) . ']'; |
| 434 | } |
| 435 | |
| 436 | /** |
| 437 | * Build a /ToUnicode CMap stream mapping glyph IDs back to Unicode code units |
| 438 | * |
| 439 | * Inverts the font's own codepoint => GID cmap. The inversion is lossy: |
| 440 | * several codepoints can share one GID (e.g. times.ttf maps both U+0020 |
| 441 | * and U+00A1 to GID 3), but a /ToUnicode CMap can only name one of them. |
| 442 | * The LOWEST codepoint wins, which keeps the ASCII/Latin-1 member of any |
| 443 | * such collision - so a space extracts as a space rather than as whatever |
| 444 | * exotic codepoint happened to be iterated last. |
| 445 | * |
| 446 | * @param TrueType $font |
| 447 | * @return string |
| 448 | */ |
| 449 | protected function buildToUnicodeCMap(TrueType $font): string |
| 450 | { |
| 451 | $gidToCodeUnit = []; |
| 452 | foreach (($font->cmap['glyphNumbers'] ?? []) as $codeUnit => $gid) { |
| 453 | if (!isset($gidToCodeUnit[$gid]) || ($codeUnit < $gidToCodeUnit[$gid])) { |
| 454 | $gidToCodeUnit[$gid] = $codeUnit; |
| 455 | } |
| 456 | } |
| 457 | ksort($gidToCodeUnit); |
| 458 | |
| 459 | $body = ''; |
| 460 | foreach (array_chunk($gidToCodeUnit, 100, true) as $chunk) { |
| 461 | $body .= count($chunk) . " beginbfchar\n"; |
| 462 | foreach ($chunk as $gid => $codeUnit) { |
| 463 | $body .= sprintf("<%04X> <%04X>\n", $gid, $codeUnit); |
| 464 | } |
| 465 | $body .= "endbfchar\n"; |
| 466 | } |
| 467 | |
| 468 | $cmapProgram = "/CIDInit /ProcSet findresource begin\n12 dict begin\nbegincmap\n" . |
| 469 | "/CIDSystemInfo <</Registry (Adobe) /Ordering (UCS) /Supplement 0>> def\n" . |
| 470 | "/CMapName /Adobe-Identity-UCS def\n/CMapType 2 def\n" . |
| 471 | "1 begincodespacerange\n<0000> <FFFF>\nendcodespacerange\n" . $body . |
| 472 | "endcmap\nCMapName currentdict /CMap defineresource pop\nend\nend\n"; |
| 473 | |
| 474 | return "{$this->toUnicodeIndex} 0 obj\n<</Length " . strlen($cmapProgram) . ">>\nstream\n" . |
| 475 | $cmapProgram . "\nendstream\nendobj\n\n"; |
| 476 | } |
| 477 | |
| 478 | } |