resize the buffers if they are not the correct size

Author: Jake Champion

runtime/js-compute-runtime/fastly-world/fastly_world_adapter.cpp

@@ -188,16 +188,26 @@ bool fastly_http_req_downstream_client_ip_addr(fastly_world_list_u8_t *ret, fast
 
 bool fastly_http_req_downstream_tls_cipher_openssl_name(fastly_world_string_t *ret,
                                                         fastly_error_t *err) {
-  ret->ptr = static_cast<char *>(cabi_malloc(128, 1));
-  return convert_result(fastly::req_downstream_tls_cipher_openssl_name(
-                            reinterpret_cast<char *>(ret->ptr), 128, &ret->len),
-                        err);
+  auto default_size = 128;
+  ret->ptr = static_cast<char *>(cabi_malloc(default_size, 1));
+  auto status = fastly::req_downstream_tls_cipher_openssl_name(
+                            reinterpret_cast<char *>(ret->ptr), default_size, &ret->len);
+  if (status == FASTLY_ERROR_BUFFER_LEN) {
+    cabi_realloc(ret->ptr, default_size, 4, ret->len);
+    status = fastly::req_downstream_tls_cipher_openssl_name(reinterpret_cast<char *>(ret->ptr), ret->len, &ret->len);
+  }
+  return convert_result(status, err);
 }
 
 bool fastly_http_req_downstream_tls_protocol(fastly_world_string_t *ret, fastly_error_t *err) {
-  ret->ptr = static_cast<char *>(cabi_malloc(32, 1));
-  return convert_result(
-      fastly::req_downstream_tls_protocol(reinterpret_cast<char *>(ret->ptr), 32, &ret->len), err);
+  auto default_size = 32;
+  ret->ptr = static_cast<char *>(cabi_malloc(default_size, 1));
+  auto status = fastly::req_downstream_tls_protocol(reinterpret_cast<char *>(ret->ptr), default_size, &ret->len);
+  if (status == FASTLY_ERROR_BUFFER_LEN) {
+    cabi_realloc(ret->ptr, default_size, 4, ret->len);
+    status = fastly::req_downstream_tls_protocol(reinterpret_cast<char *>(ret->ptr), ret->len, &ret->len);
+  }
+  return convert_result(status, err);
 }
 
 bool fastly_http_req_downstream_tls_raw_client_certificate(fastly_world_list_u8_t *ret,
@@ -215,9 +225,14 @@ bool fastly_http_req_downstream_tls_raw_client_certificate(fastly_world_list_u8_
 }
 
 bool fastly_http_req_downstream_tls_ja3_md5(fastly_world_list_u8_t *ret, fastly_error_t *err) {
-  ret->ptr = static_cast<uint8_t *>(cabi_malloc(16, 1));
-  return convert_result(
-      fastly::req_downstream_tls_ja3_md5(reinterpret_cast<char *>(ret->ptr), &ret->len), err);
+  auto default_size = 16;
+  ret->ptr = static_cast<uint8_t *>(cabi_malloc(default_size, 1));
+  auto status = fastly::req_downstream_tls_ja3_md5(reinterpret_cast<char *>(ret->ptr), &ret->len);
+  if (status == FASTLY_ERROR_BUFFER_LEN) {
+    cabi_realloc(ret->ptr, default_size, 4, ret->len);
+    status = fastly::req_downstream_tls_ja3_md5(reinterpret_cast<char *>(ret->ptr, &ret->len);
+  }
+  return convert_result(status, err);
 }
 bool fastly_http_req_downstream_tls_client_hello(fastly_world_list_u8_t *ret, fastly_error_t *err) {
   auto default_size = 512;