Initial checkin of gRPC to third_party/

third_party/grpc/src/core/json/json_writer.h

Index: third_party/grpc/src/core/json/json_writer.h
diff --git a/third_party/grpc/src/core/json/json_writer.h b/third_party/grpc/src/core/json/json_writer.h
new file mode 100644
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+++ b/third_party/grpc/src/core/json/json_writer.h
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+/*
+ *
+ * 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.
+ *
+ */
+
+/* The idea of the writer is basically symmetrical of the reader. While the
+ * reader emits various calls to your code, the writer takes basically the
+ * same calls and emit json out of it. It doesn't try to make any check on
+ * the order of the calls you do on it. Meaning you can theorically force
+ * it to generate invalid json.
+ *
+ * Also, unlike the reader, the writer expects UTF-8 encoded input strings.
+ * These strings will be UTF-8 validated, and any invalid character will
+ * cut the conversion short, before any invalid UTF-8 sequence, thus forming
+ * a valid UTF-8 string overall.
+ */
+
+#ifndef GRPC_INTERNAL_CORE_JSON_JSON_WRITER_H
+#define GRPC_INTERNAL_CORE_JSON_JSON_WRITER_H
+
+#include <stdlib.h>
+
+#include "src/core/json/json_common.h"
+
+typedef struct grpc_json_writer_vtable {
+  /* Adds a character to the output stream. */
+  void (*output_char)(void *userdata, char);
+  /* Adds a zero-terminated string to the output stream. */
+  void (*output_string)(void *userdata, const char *str);
+  /* Adds a fixed-length string to the output stream. */
+  void (*output_string_with_len)(void *userdata, const char *str, size_t len);
+
+} grpc_json_writer_vtable;
+
+typedef struct grpc_json_writer {
+  void *userdata;
+  grpc_json_writer_vtable *vtable;
+  int indent;
+  int depth;
+  int container_empty;
+  int got_key;
+} grpc_json_writer;
+
+/* Call this to initialize your writer structure. The indent parameter is
+ * specifying the number of spaces to use for indenting the output. If you
+ * use indent=0, then the output will not have any newlines either, thus
+ * emitting a condensed json output.
+ */
+void grpc_json_writer_init(grpc_json_writer *writer, int indent,
+                           grpc_json_writer_vtable *vtable, void *userdata);
+
+/* Signals the beginning of a container. */
+void grpc_json_writer_container_begins(grpc_json_writer *writer,
+                                       grpc_json_type type);
+/* Signals the end of a container. */
+void grpc_json_writer_container_ends(grpc_json_writer *writer,
+                                     grpc_json_type type);
+/* Writes down an object key for the next value. */
+void grpc_json_writer_object_key(grpc_json_writer *writer, const char *string);
+/* Sets a raw value. Useful for numbers. */
+void grpc_json_writer_value_raw(grpc_json_writer *writer, const char *string);
+/* Sets a raw value with its length. Useful for values like true or false. */
+void grpc_json_writer_value_raw_with_len(grpc_json_writer *writer,
+                                         const char *string, size_t len);
+/* Sets a string value. It'll be escaped, and utf-8 validated. */
+void grpc_json_writer_value_string(grpc_json_writer *writer,
+                                   const char *string);
+
+#endif /* GRPC_INTERNAL_CORE_JSON_JSON_WRITER_H */