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diff --git a/3rdparty/gumbo-parser/src/string_buffer.h b/3rdparty/gumbo-parser/src/string_buffer.h
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+// Copyright 2010 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Author: jdtang@google.com (Jonathan Tang)
+//
+#ifndef GUMBO_STRING_BUFFER_H_
+#define GUMBO_STRING_BUFFER_H_
+
+#include <stdbool.h>
+#include <stddef.h>
+
+#include "gumbo.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct GumboInternalParser;
+
+// A struct representing a mutable, growable string.  This consists of a
+// heap-allocated buffer that may grow (by doubling) as necessary.  When
+// converting to a string, this allocates a new buffer that is only as long as
+// it needs to be.  Note that the internal buffer here is *not* nul-terminated,
+// so be sure not to use ordinary string manipulation functions on it.
+typedef struct {
+  // A pointer to the beginning of the string.  NULL iff length == 0.
+  char* data;
+
+  // The length of the string fragment, in bytes.  May be zero.
+  size_t length;
+
+  // The capacity of the buffer, in bytes.
+  size_t capacity;
+} GumboStringBuffer;
+
+// Initializes a new GumboStringBuffer.
+void gumbo_string_buffer_init(
+    struct GumboInternalParser* parser, GumboStringBuffer* output);
+
+// Ensures that the buffer contains at least a certain amount of space.  Most
+// useful with snprintf and the other length-delimited string functions, which
+// may want to write directly into the buffer.
+void gumbo_string_buffer_reserve(struct GumboInternalParser* parser,
+    size_t min_capacity, GumboStringBuffer* output);
+
+// Appends a single Unicode codepoint onto the end of the GumboStringBuffer.
+// This is essentially a UTF-8 encoder, and may add 1-4 bytes depending on the
+// value of the codepoint.
+void gumbo_string_buffer_append_codepoint(
+    struct GumboInternalParser* parser, int c, GumboStringBuffer* output);
+
+// Appends a string onto the end of the GumboStringBuffer.
+void gumbo_string_buffer_append_string(struct GumboInternalParser* parser,
+    GumboStringPiece* str, GumboStringBuffer* output);
+
+// Converts this string buffer to const char*, alloctaing a new buffer for it.
+char* gumbo_string_buffer_to_string(
+    struct GumboInternalParser* parser, GumboStringBuffer* input);
+
+// Reinitialize this string buffer.  This clears it by setting length=0.  It
+// does not zero out the buffer itself.
+void gumbo_string_buffer_clear(
+    struct GumboInternalParser* parser, GumboStringBuffer* input);
+
+// Deallocates this GumboStringBuffer.
+void gumbo_string_buffer_destroy(
+    struct GumboInternalParser* parser, GumboStringBuffer* buffer);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // GUMBO_STRING_BUFFER_H_