Initial checkin of gRPC to third_party/

third_party/grpc/src/core/transport/chttp2/frame_ping.c

Index: third_party/grpc/src/core/transport/chttp2/frame_ping.c
diff --git a/third_party/grpc/src/core/transport/chttp2/frame_ping.c b/third_party/grpc/src/core/transport/chttp2/frame_ping.c
new file mode 100644
index 0000000000000000000000000000000000000000..c6ab522283d689166e98041c4252bf1936d23e86
--- /dev/null
+++ b/third_party/grpc/src/core/transport/chttp2/frame_ping.c
@@ -0,0 +1,97 @@
+/*
+ *
+ * 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_ping.h"
+#include "src/core/transport/chttp2/internal.h"
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+gpr_slice grpc_chttp2_ping_create(uint8_t ack, uint8_t *opaque_8bytes) {
+  gpr_slice slice = gpr_slice_malloc(9 + 8);
+  uint8_t *p = GPR_SLICE_START_PTR(slice);
+
+  *p++ = 0;
+  *p++ = 0;
+  *p++ = 8;
+  *p++ = GRPC_CHTTP2_FRAME_PING;
+  *p++ = ack ? 1 : 0;
+  *p++ = 0;
+  *p++ = 0;
+  *p++ = 0;
+  *p++ = 0;
+  memcpy(p, opaque_8bytes, 8);
+
+  return slice;
+}
+
+grpc_chttp2_parse_error grpc_chttp2_ping_parser_begin_frame(
+    grpc_chttp2_ping_parser *parser, uint32_t length, uint8_t flags) {
+  if (flags & 0xfe || length != 8) {
+    gpr_log(GPR_ERROR, "invalid ping: length=%d, flags=%02x", length, flags);
+    return GRPC_CHTTP2_CONNECTION_ERROR;
+  }
+  parser->byte = 0;
+  parser->is_ack = flags;
+  return GRPC_CHTTP2_PARSE_OK;
+}
+
+grpc_chttp2_parse_error grpc_chttp2_ping_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_ping_parser *p = parser;
+
+  while (p->byte != 8 && cur != end) {
+    p->opaque_8bytes[p->byte] = *cur;
+    cur++;
+    p->byte++;
+  }
+
+  if (p->byte == 8) {
+    GPR_ASSERT(is_last);
+    if (p->is_ack) {
+      grpc_chttp2_ack_ping(exec_ctx, transport_parsing, p->opaque_8bytes);
+    } else {
+      gpr_slice_buffer_add(&transport_parsing->qbuf,
+                           grpc_chttp2_ping_create(1, p->opaque_8bytes));
+    }
+  }
+
+  return GRPC_CHTTP2_PARSE_OK;
+}