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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Filters; |
| 6 | |
| 7 | /** |
| 8 | * ASCIIHexDecode — hex encoding for binary data (ISO 32000-2 §7.4.2). |
| 9 | * |
| 10 | * Simplest PDF filter: each byte becomes two hex digits. Doubles the |
| 11 | * size but produces fully human-readable output, useful for debugging. |
| 12 | * Terminated by '>'. |
| 13 | */ |
| 14 | final class AsciiHexFilter implements FilterInterface |
| 15 | { |
| 16 | public function encode(string $data): string |
| 17 | { |
| 18 | return bin2hex($data) . '>'; |
| 19 | } |
| 20 | |
| 21 | public function decode(string $data): string |
| 22 | { |
| 23 | // Strip whitespace |
| 24 | $data = preg_replace('/\s+/', '', $data); |
| 25 | // Strip trailing > |
| 26 | $data = rtrim($data, '>'); |
| 27 | if (!ctype_xdigit($data) && $data !== '') { |
| 28 | throw new \RuntimeException('AsciiHexFilter: invalid hex data'); |
| 29 | } |
| 30 | // If odd number of hex chars, pad with trailing zero |
| 31 | if (strlen($data) % 2 !== 0) { |
| 32 | $data .= '0'; |
| 33 | } |
| 34 | return hex2bin($data); |
| 35 | } |
| 36 | } |