Fetching varchar(max) as a stream results in Fatal Error with Always Encrypted

[yitam]

Tested in Windows with the latest sqlsrv 5.1.2-preview

1. Connect with ColumnEncryption enabled
2. Create a table with one column of type varchar(max) with encryption
3. Insert one row and retrieve data from this table as stream
4. Fatal Error (seemingly stuck in an infinite loop).
5. Same problem with UTF-8 option (connection or retrieval)

The repro script:

sqlsrv_query($conn, "CREATE TABLE [test_max_fields] ( [varchar_max_col] varchar(max) COLLATE Latin1_General_BIN2 ENCRYPTED WITH (ENCRYPTION_TYPE = deterministic, ALGORITHM = 'AEAD_AES_256_CBC_HMAC_SHA_256', COLUMN_ENCRYPTION_KEY = AEColumnKey) )");

$inValue = str_repeat("ÃÜðßZZýA©", 1000);
$insertSql = "INSERT INTO [test_max_fields] (varchar_max_col) VALUES (?)";
$params = array($inValue);

$stmt = sqlsrv_prepare($conn, $insertSql, $params);
if ($stmt) {
    sqlsrv_execute($stmt);
} 

$query = "SELECT * FROM [test_max_fields]";
$stmt = sqlsrv_prepare($conn, $query);
if ($stmt) {
    sqlsrv_execute($stmt);
} 

 if (!sqlsrv_fetch($stmt)) { 
     fatalError("Failed to fetch row ");
 }

$stream = sqlsrv_get_field($stmt, 0, SQLSRV_PHPTYPE_STREAM(SQLSRV_ENC_CHAR));

if ($stream === false) {
    fatalError("Failed to read field");
} else {
    $value = '';
    if ($stream) {
        $num = 0;
        while (!feof($stream)) {
            $value .= fread($stream, 8192); // infinite loop?! 
        }
        fclose($stream);
        
        if (!checkData($value, $inValue)) {  // compare the data to see if they match!
            fatalError("Data corruption!\n");
        }
    } else {
        fatalError("Error in getting stream!");
    }
}

[yitam]

Resolved in 5.2.0-RC