Initial checkin of gRPC to third_party/

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

Index: third_party/grpc/src/core/transport/chttp2/frame_data.c
diff --git a/third_party/grpc/src/core/transport/chttp2/frame_data.c b/third_party/grpc/src/core/transport/chttp2/frame_data.c
new file mode 100644
index 0000000000000000000000000000000000000000..f9a1af88736239d3597213a3278116f5a46c1237
--- /dev/null
+++ b/third_party/grpc/src/core/transport/chttp2/frame_data.c
@@ -0,0 +1,248 @@
+/*
+ *
+ * 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_data.h"
+
+#include <string.h>
+
+#include "src/core/transport/chttp2/internal.h"
+#include "src/core/support/string.h"
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/useful.h>
+#include "src/core/transport/transport.h"
+
+grpc_chttp2_parse_error grpc_chttp2_data_parser_init(
+    grpc_chttp2_data_parser *parser) {
+  parser->state = GRPC_CHTTP2_DATA_FH_0;
+  parser->parsing_frame = NULL;
+  return GRPC_CHTTP2_PARSE_OK;
+}
+
+void grpc_chttp2_data_parser_destroy(grpc_exec_ctx *exec_ctx,
+                                     grpc_chttp2_data_parser *parser) {
+  grpc_byte_stream *bs;
+  if (parser->parsing_frame) {
+    grpc_chttp2_incoming_byte_stream_finished(exec_ctx, parser->parsing_frame,
+                                              0, 1);
+  }
+  while (
+      (bs = grpc_chttp2_incoming_frame_queue_pop(&parser->incoming_frames))) {
+    grpc_byte_stream_destroy(exec_ctx, bs);
+  }
+}
+
+grpc_chttp2_parse_error grpc_chttp2_data_parser_begin_frame(
+    grpc_chttp2_data_parser *parser, uint8_t flags) {
+  if (flags & ~GRPC_CHTTP2_DATA_FLAG_END_STREAM) {
+    gpr_log(GPR_ERROR, "unsupported data flags: 0x%02x", flags);
+    return GRPC_CHTTP2_STREAM_ERROR;
+  }
+
+  if (flags & GRPC_CHTTP2_DATA_FLAG_END_STREAM) {
+    parser->is_last_frame = 1;
+  } else {
+    parser->is_last_frame = 0;
+  }
+
+  return GRPC_CHTTP2_PARSE_OK;
+}
+
+void grpc_chttp2_incoming_frame_queue_merge(
+    grpc_chttp2_incoming_frame_queue *head_dst,
+    grpc_chttp2_incoming_frame_queue *tail_src) {
+  if (tail_src->head == NULL) {
+    return;
+  }
+
+  if (head_dst->head == NULL) {
+    *head_dst = *tail_src;
+    memset(tail_src, 0, sizeof(*tail_src));
+    return;
+  }
+
+  head_dst->tail->next_message = tail_src->head;
+  head_dst->tail = tail_src->tail;
+  memset(tail_src, 0, sizeof(*tail_src));
+}
+
+grpc_byte_stream *grpc_chttp2_incoming_frame_queue_pop(
+    grpc_chttp2_incoming_frame_queue *q) {
+  grpc_byte_stream *out;
+  if (q->head == NULL) {
+    return NULL;
+  }
+  out = &q->head->base;
+  if (q->head == q->tail) {
+    memset(q, 0, sizeof(*q));
+  } else {
+    q->head = q->head->next_message;
+  }
+  return out;
+}
+
+void grpc_chttp2_encode_data(uint32_t id, gpr_slice_buffer *inbuf,
+                             uint32_t write_bytes, int is_eof,
+                             gpr_slice_buffer *outbuf) {
+  gpr_slice hdr;
+  uint8_t *p;
+
+  hdr = gpr_slice_malloc(9);
+  p = GPR_SLICE_START_PTR(hdr);
+  GPR_ASSERT(write_bytes < (1 << 24));
+  *p++ = (uint8_t)(write_bytes >> 16);
+  *p++ = (uint8_t)(write_bytes >> 8);
+  *p++ = (uint8_t)(write_bytes);
+  *p++ = GRPC_CHTTP2_FRAME_DATA;
+  *p++ = is_eof ? GRPC_CHTTP2_DATA_FLAG_END_STREAM : 0;
+  *p++ = (uint8_t)(id >> 24);
+  *p++ = (uint8_t)(id >> 16);
+  *p++ = (uint8_t)(id >> 8);
+  *p++ = (uint8_t)(id);
+  gpr_slice_buffer_add(outbuf, hdr);
+
+  gpr_slice_buffer_move_first(inbuf, write_bytes, outbuf);
+}
+
+grpc_chttp2_parse_error grpc_chttp2_data_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_data_parser *p = parser;
+  uint32_t message_flags;
+  grpc_chttp2_incoming_byte_stream *incoming_byte_stream;
+
+  if (is_last && p->is_last_frame) {
+    stream_parsing->received_close = 1;
+  }
+
+  if (cur == end) {
+    return GRPC_CHTTP2_PARSE_OK;
+  }
+
+  switch (p->state) {
+  fh_0:
+    case GRPC_CHTTP2_DATA_FH_0:
+      p->frame_type = *cur;
+      switch (p->frame_type) {
+        case 0:
+          p->is_frame_compressed = 0; /* GPR_FALSE */
+          break;
+        case 1:
+          p->is_frame_compressed = 1; /* GPR_TRUE */
+          break;
+        default:
+          gpr_log(GPR_ERROR, "Bad GRPC frame type 0x%02x", p->frame_type);
+          return GRPC_CHTTP2_STREAM_ERROR;
+      }
+      if (++cur == end) {
+        p->state = GRPC_CHTTP2_DATA_FH_1;
+        return GRPC_CHTTP2_PARSE_OK;
+      }
+    /* fallthrough */
+    case GRPC_CHTTP2_DATA_FH_1:
+      p->frame_size = ((uint32_t)*cur) << 24;
+      if (++cur == end) {
+        p->state = GRPC_CHTTP2_DATA_FH_2;
+        return GRPC_CHTTP2_PARSE_OK;
+      }
+    /* fallthrough */
+    case GRPC_CHTTP2_DATA_FH_2:
+      p->frame_size |= ((uint32_t)*cur) << 16;
+      if (++cur == end) {
+        p->state = GRPC_CHTTP2_DATA_FH_3;
+        return GRPC_CHTTP2_PARSE_OK;
+      }
+    /* fallthrough */
+    case GRPC_CHTTP2_DATA_FH_3:
+      p->frame_size |= ((uint32_t)*cur) << 8;
+      if (++cur == end) {
+        p->state = GRPC_CHTTP2_DATA_FH_4;
+        return GRPC_CHTTP2_PARSE_OK;
+      }
+    /* fallthrough */
+    case GRPC_CHTTP2_DATA_FH_4:
+      p->frame_size |= ((uint32_t)*cur);
+      p->state = GRPC_CHTTP2_DATA_FRAME;
+      ++cur;
+      message_flags = 0;
+      if (p->is_frame_compressed) {
+        message_flags |= GRPC_WRITE_INTERNAL_COMPRESS;
+      }
+      p->parsing_frame = incoming_byte_stream =
+          grpc_chttp2_incoming_byte_stream_create(
+              exec_ctx, transport_parsing, stream_parsing, p->frame_size,
+              message_flags, &p->incoming_frames);
+    /* fallthrough */
+    case GRPC_CHTTP2_DATA_FRAME:
+      if (cur == end) {
+        grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
+                                                 stream_parsing);
+        return GRPC_CHTTP2_PARSE_OK;
+      }
+      grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
+                                               stream_parsing);
+      if ((uint32_t)(end - cur) == p->frame_size) {
+        grpc_chttp2_incoming_byte_stream_push(
+            exec_ctx, p->parsing_frame,
+            gpr_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
+        grpc_chttp2_incoming_byte_stream_finished(exec_ctx, p->parsing_frame, 1,
+                                                  1);
+        p->parsing_frame = NULL;
+        p->state = GRPC_CHTTP2_DATA_FH_0;
+        return GRPC_CHTTP2_PARSE_OK;
+      } else if ((uint32_t)(end - cur) > p->frame_size) {
+        grpc_chttp2_incoming_byte_stream_push(
+            exec_ctx, p->parsing_frame,
+            gpr_slice_sub(slice, (size_t)(cur - beg),
+                          (size_t)(cur + p->frame_size - beg)));
+        grpc_chttp2_incoming_byte_stream_finished(exec_ctx, p->parsing_frame, 1,
+                                                  1);
+        p->parsing_frame = NULL;
+        cur += p->frame_size;
+        goto fh_0; /* loop */
+      } else {
+        grpc_chttp2_incoming_byte_stream_push(
+            exec_ctx, p->parsing_frame,
+            gpr_slice_sub(slice, (size_t)(cur - beg), (size_t)(end - beg)));
+        GPR_ASSERT((size_t)(end - cur) <= p->frame_size);
+        p->frame_size -= (uint32_t)(end - cur);
+        return GRPC_CHTTP2_PARSE_OK;
+      }
+  }
+
+  GPR_UNREACHABLE_CODE(return GRPC_CHTTP2_CONNECTION_ERROR);
+}