1 files changed, 113 insertions, 0 deletions
diff --git a/src/core/lib/transport/chttp2/frame_window_update.c b/src/core/lib/transport/chttp2/frame_window_update.c
new file mode 100644
index 0000000000..62d9bac117
--- /dev/null
+++ b/src/core/lib/transport/chttp2/frame_window_update.c
@@ -0,0 +1,113 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/transport/chttp2/frame_window_update.h"
+#include "src/core/transport/chttp2/internal.h"
+
+#include <grpc/support/log.h>
+
+gpr_slice grpc_chttp2_window_update_create(uint32_t id,
+                                           uint32_t window_update) {
+  gpr_slice slice = gpr_slice_malloc(13);
+  uint8_t *p = GPR_SLICE_START_PTR(slice);
+
+  GPR_ASSERT(window_update);
+
+  *p++ = 0;
+  *p++ = 0;
+  *p++ = 4;
+  *p++ = GRPC_CHTTP2_FRAME_WINDOW_UPDATE;
+  *p++ = 0;
+  *p++ = (uint8_t)(id >> 24);
+  *p++ = (uint8_t)(id >> 16);
+  *p++ = (uint8_t)(id >> 8);
+  *p++ = (uint8_t)(id);
+  *p++ = (uint8_t)(window_update >> 24);
+  *p++ = (uint8_t)(window_update >> 16);
+  *p++ = (uint8_t)(window_update >> 8);
+  *p++ = (uint8_t)(window_update);
+
+  return slice;
+}
+
+grpc_chttp2_parse_error grpc_chttp2_window_update_parser_begin_frame(
+    grpc_chttp2_window_update_parser *parser, uint32_t length, uint8_t flags) {
+  if (flags || length != 4) {
+    gpr_log(GPR_ERROR, "invalid window update: length=%d, flags=%02x", length,
+            flags);
+    return GRPC_CHTTP2_CONNECTION_ERROR;
+  }
+  parser->byte = 0;
+  parser->amount = 0;
+  return GRPC_CHTTP2_PARSE_OK;
+}
+
+grpc_chttp2_parse_error grpc_chttp2_window_update_parser_parse(
+    grpc_exec_ctx *exec_ctx, void *parser,
+    grpc_chttp2_transport_parsing *transport_parsing,
+    grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last) {
+  uint8_t *const beg = GPR_SLICE_START_PTR(slice);
+  uint8_t *const end = GPR_SLICE_END_PTR(slice);
+  uint8_t *cur = beg;
+  grpc_chttp2_window_update_parser *p = parser;
+
+  while (p->byte != 4 && cur != end) {
+    p->amount |= ((uint32_t)*cur) << (8 * (3 - p->byte));
+    cur++;
+    p->byte++;
+  }
+
+  if (p->byte == 4) {
+    uint32_t received_update = p->amount;
+    if (received_update == 0 || (received_update & 0x80000000u)) {
+      gpr_log(GPR_ERROR, "invalid window update bytes: %d", p->amount);
+      return GRPC_CHTTP2_CONNECTION_ERROR;
+    }
+    GPR_ASSERT(is_last);
+
+    if (transport_parsing->incoming_stream_id != 0) {
+      if (stream_parsing != NULL) {
+        GRPC_CHTTP2_FLOW_CREDIT_STREAM("parse", transport_parsing,
+                                       stream_parsing, outgoing_window,
+                                       received_update);
+        grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
+                                                 stream_parsing);
+      }
+    } else {
+      GRPC_CHTTP2_FLOW_CREDIT_TRANSPORT("parse", transport_parsing,
+                                        outgoing_window, received_update);
+    }
+  }
+
+  return GRPC_CHTTP2_PARSE_OK;
+}