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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\Extract; |
| 16 | |
| 17 | use Pop\Pdf\Extract\Filter\Budget; |
| 18 | use Pop\Pdf\Extract\Filter\Registry; |
| 19 | |
| 20 | /** |
| 21 | * Pdf extract object stream class |
| 22 | * |
| 23 | * @category Pop |
| 24 | * @package Pop\Pdf |
| 25 | * @author Nick Sagona, III <nick@popphp.org> |
| 26 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 27 | * @license https://www.popphp.org/license New BSD License |
| 28 | * @version 6.0.0 |
| 29 | */ |
| 30 | class ObjectStream |
| 31 | { |
| 32 | |
| 33 | /** |
| 34 | * Expand an object stream into its map of object number to parsed object value |
| 35 | * |
| 36 | * @param Value\Stream $stream |
| 37 | * @param ?Budget $budget |
| 38 | * @return array |
| 39 | */ |
| 40 | public static function expand(Value\Stream $stream, ?Budget $budget = null): array |
| 41 | { |
| 42 | $dict = $stream->dict; |
| 43 | $raw = Registry::decode($stream->raw, $dict['Filter'] ?? null, $dict['DecodeParms'] ?? null, $budget); |
| 44 | |
| 45 | $n = $dict['N'] ?? 0; |
| 46 | $first = $dict['First'] ?? 0; |
| 47 | |
| 48 | // /N and /First come straight out of a producer-controlled dict and |
| 49 | // may resolve to a non-numeric Value (a Reference, a Name, ...) |
| 50 | // rather than an int/float - casting one of those directly to int |
| 51 | // emits a PHP warning that a strict error handler (common in real |
| 52 | // apps embedding this library) turns into an uncaught \Throwable, |
| 53 | // escaping every catch(Exception) guard this codebase relies on. |
| 54 | // Falling back to 0 for a non-numeric value degrades to "no pairs |
| 55 | // found", matching how a malformed/unresolvable stream is already |
| 56 | // handled elsewhere. |
| 57 | $n = (is_int($n) || is_float($n)) ? (int) $n : 0; |
| 58 | $first = (is_int($first) || is_float($first)) ? max(0, (int) $first) : 0; |
| 59 | |
| 60 | // Tokenize only the header region (bytes before /First) rather than |
| 61 | // the whole raw stream - otherwise, once a huge /N outruns the real |
| 62 | // header pairs, the tokenizer keeps reading into the object data |
| 63 | // that follows and misinterprets it as further bogus pairs instead |
| 64 | // of ever reaching EOF where the header actually ends. |
| 65 | $headerData = substr($raw, 0, $first); |
| 66 | $headerTokenizer = new Tokenizer($headerData, 0); |
| 67 | $pairs = []; |
| 68 | |
| 69 | for ($i = 0; $i < $n; $i++) { |
| 70 | $objNumToken = $headerTokenizer->next(); |
| 71 | if ($objNumToken['type'] === 'eof') { |
| 72 | break; |
| 73 | } |
| 74 | $offsetToken = $headerTokenizer->next(); |
| 75 | if ($offsetToken['type'] === 'eof') { |
| 76 | break; |
| 77 | } |
| 78 | $pairs[] = [(int) $objNumToken['value'], (int) $offsetToken['value']]; |
| 79 | } |
| 80 | |
| 81 | $objects = []; |
| 82 | |
| 83 | foreach ($pairs as [$objNum, $offset]) { |
| 84 | $tokenizer = new Tokenizer($raw, $first + $offset); |
| 85 | $parser = new ObjectParser($tokenizer); |
| 86 | $objects[$objNum] = $parser->parseValue(); |
| 87 | } |
| 88 | |
| 89 | return $objects; |
| 90 | } |
| 91 | |
| 92 | } |