initial import

base64config.php

@@ -0,0 +1,69 @@
+<?php
+/*
+ * Shared configuration for maximum base64 payload sizes.
+ */
+
+define('BASE64_CHUNK_CONFIG_FILE', __DIR__ . '/config/base64-chunks.php');
+
+function base64_chunk_defaults()
+{
+    return array(
+        'racket_zip_max_base64_kb' => 8192,
+        'package_zip_max_base64_kb' => 2048,
+    );
+}
+
+function load_base64_chunk_config()
+{
+    $defaults = base64_chunk_defaults();
+    $config = is_file(BASE64_CHUNK_CONFIG_FILE)
+        ? require BASE64_CHUNK_CONFIG_FILE
+        : array();
+
+    if (!is_array($config)) {
+        $config = array();
+    }
+
+    foreach ($defaults as $key => $default) {
+        $value = (int)($config[$key] ?? $default);
+        $config[$key] = $value > 0 ? $value : $default;
+    }
+
+    return array_intersect_key($config, $defaults);
+}
+
+function save_base64_chunk_config($config)
+{
+    $defaults = base64_chunk_defaults();
+    $clean = array();
+
+    foreach ($defaults as $key => $default) {
+        $value = (int)($config[$key] ?? $default);
+
+        if ($value < 1) {
+            throw new InvalidArgumentException('Base64 chunk size must be at least 1 KiB.');
+        }
+
+        $clean[$key] = $value;
+    }
+
+    $php = "<?php\n" .
+        "/*\n" .
+        " * Maximale grootte van base64-payloads, in KiB.\n" .
+        " *\n" .
+        " * 1 KiB = 1024 bytes. De splitter rondt intern waar nodig naar beneden af\n" .
+        " * zodat de binaire chunks netjes naar base64 omgezet kunnen worden.\n" .
+        " */\n\n" .
+        "return " . var_export($clean, true) . ";\n";
+
+    $tmp = BASE64_CHUNK_CONFIG_FILE . '.tmp';
+
+    if (file_put_contents($tmp, $php, LOCK_EX) === false) {
+        throw new RuntimeException('Could not write temporary base64 chunk config.');
+    }
+
+    if (!rename($tmp, BASE64_CHUNK_CONFIG_FILE)) {
+        @unlink($tmp);
+        throw new RuntimeException('Could not replace base64 chunk config.');
+    }
+}