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<?php /** * Invoice Ninja (https://invoiceninja.com). * * @link https://github.com/invoiceninja/invoiceninja source repository * * @copyright Copyright (c) 2025. Invoice Ninja LLC (https://invoiceninja.com) * * @license https://www.elastic.co/licensing/elastic-license */ namespace App\Utils; class Encode { /** * Convert string content to UTF-8 * Safe for emojis, file content, and any encoding issues */ public static function convert(string $contents): string { // Check for different UTF BOMs and handle accordingly $bomResult = self::detectAndHandleUTFEncoding($contents); if ($bomResult !== null) { return $bomResult; } // Remove BOM if present (for UTF-8 BOM) $contents = self::removeBOM($contents); // Check if it's clean UTF-8 first (no conversion needed) // This handles emojis, accented characters, and any valid UTF-8 content if (mb_check_encoding($contents, 'UTF-8') && self::isValidConversion($contents)) { return $contents; } // Method 1: Try Windows-1252 conversion $contextContents = $contents; if ($contextContents !== false) { $contextContents = self::removeBOM($contextContents); $converted = mb_convert_encoding($contextContents, 'UTF-8', 'WINDOWS-1252'); if (self::isValidConversion($converted)) { return $converted; } } // Method 2: Binary conversion $binaryContents = $contents; $binaryContents = self::removeBOM($binaryContents); // Check if this looks like Windows-1252 by looking for problem bytes if (self::containsWindows1252Bytes($binaryContents)) { $converted = mb_convert_encoding($binaryContents, 'UTF-8', 'WINDOWS-1252'); if (self::isValidConversion($converted)) { return $converted; } } // Method 3: Fix corrupted UTF-8 replacement characters if ($contents !== false) { $fixed = self::fixCorruptedWindows1252($contents); if (self::isValidConversion($fixed)) { return $fixed; } } // Method 4: Try different encoding auto-detection with broader list if ($contents !== false) { $encodings = ['WINDOWS-1252', 'ISO-8859-1', 'ISO-8859-15', 'CP1252']; foreach ($encodings as $encoding) { $converted = mb_convert_encoding($contents, 'UTF-8', $encoding); if (self::isValidConversion($converted)) { return $converted; } } } // Fallback: return original contents return $contents ?: ''; } /** * Detect and handle UTF-16 and UTF-32 encodings based on BOM */ private static function detectAndHandleUTFEncoding(string $data): ?string { // UTF-32 BE BOM if (substr($data, 0, 4) === "\x00\x00\xFE\xFF") { $withoutBOM = substr($data, 4); return mb_convert_encoding($withoutBOM, 'UTF-8', 'UTF-32BE'); } // UTF-32 LE BOM if (substr($data, 0, 4) === "\xFF\xFE\x00\x00") { $withoutBOM = substr($data, 4); return mb_convert_encoding($withoutBOM, 'UTF-8', 'UTF-32LE'); } // UTF-16 BE BOM if (substr($data, 0, 2) === "\xFE\xFF") { $withoutBOM = substr($data, 2); return mb_convert_encoding($withoutBOM, 'UTF-8', 'UTF-16BE'); } // UTF-16 LE BOM if (substr($data, 0, 2) === "\xFF\xFE") { $withoutBOM = substr($data, 2); return mb_convert_encoding($withoutBOM, 'UTF-8', 'UTF-16LE'); } // Try to detect UTF-16/32 without BOM (heuristic approach) $length = strlen($data); // UTF-32 detection (every 4th byte pattern) if ($length >= 8 && $length % 4 === 0) { $nullCount = 0; for ($i = 0; $i < min(100, $length); $i += 4) { if ($data[$i] === "\x00" && $data[$i + 1] === "\x00" && $data[$i + 2] === "\x00") { $nullCount++; } } if ($nullCount > 5) { // Likely UTF-32LE return mb_convert_encoding($data, 'UTF-8', 'UTF-32LE'); } } // UTF-16 detection (every 2nd byte pattern) if ($length >= 4 && $length % 2 === 0) { $nullCount = 0; for ($i = 0; $i < min(100, $length); $i += 2) { if ($data[$i + 1] === "\x00") { $nullCount++; } } if ($nullCount > 10) { // Likely UTF-16LE return mb_convert_encoding($data, 'UTF-8', 'UTF-16LE'); } // Check for UTF-16BE $nullCount = 0; for ($i = 0; $i < min(100, $length); $i += 2) { if ($data[$i] === "\x00") { $nullCount++; } } if ($nullCount > 10) { // Likely UTF-16BE return mb_convert_encoding($data, 'UTF-8', 'UTF-16BE'); } } return null; } /** * Remove BOM (Byte Order Mark) from the beginning of a string */ private static function removeBOM(string $data): string { // UTF-8 BOM if (substr($data, 0, 3) === "\xEF\xBB\xBF") { return substr($data, 3); } // UTF-16 BE BOM if (substr($data, 0, 2) === "\xFE\xFF") { return substr($data, 2); } // UTF-16 LE BOM if (substr($data, 0, 2) === "\xFF\xFE") { return substr($data, 2); } // UTF-32 BE BOM if (substr($data, 0, 4) === "\x00\x00\xFE\xFF") { return substr($data, 4); } // UTF-32 LE BOM if (substr($data, 0, 4) === "\xFF\xFE\x00\x00") { return substr($data, 4); } return $data; } private static function containsWindows1252Bytes(string $data): bool { // Check for Windows-1252 specific bytes in 0x80-0x9F range $windows1252Bytes = [0x80, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8E, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9E, 0x9F]; foreach ($windows1252Bytes as $byte) { if (strpos($data, chr($byte)) !== false) { return true; } } return false; } private static function fixCorruptedWindows1252(string $data): string { // Map of UTF-8 replacement sequences back to proper characters $replacements = [ "\xEF\xBF\xBD" => "\u{2019}", // Most common: right single quote (0x92) - use smart quote // Add more mappings as needed based on your data ]; return str_replace(array_keys($replacements), array_values($replacements), $data); } private static function isValidConversion(string $data): bool { // Check if conversion was successful: // 1. Must be valid UTF-8 // 2. Must NOT contain replacement characters (indicating corruption) // 3. Additional check for double-encoded replacement return mb_check_encoding($data, 'UTF-8') && !str_contains($data, "\xEF\xBF\xBD") && // UTF-8 replacement character bytes !str_contains($data, '�'); // Double-encoded replacement character } }
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