--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/gumbo-parser/src/vector.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,123 @@
+// 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)
+
+#include "vector.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
+#include "util.h"
+
+struct GumboInternalParser;
+
+const GumboVector kGumboEmptyVector = {NULL, 0, 0};
+
+void gumbo_vector_init(struct GumboInternalParser* parser,
+    size_t initial_capacity, GumboVector* vector) {
+  vector->length = 0;
+  vector->capacity = initial_capacity;
+  if (initial_capacity > 0) {
+    vector->data =
+        gumbo_parser_allocate(parser, sizeof(void*) * initial_capacity);
+  } else {
+    vector->data = NULL;
+  }
+}
+
+void gumbo_vector_destroy(
+    struct GumboInternalParser* parser, GumboVector* vector) {
+  if (vector->capacity > 0) {
+    gumbo_parser_deallocate(parser, vector->data);
+  }
+}
+
+static void enlarge_vector_if_full(
+    struct GumboInternalParser* parser, GumboVector* vector) {
+  if (vector->length >= vector->capacity) {
+    if (vector->capacity) {
+      size_t old_num_bytes = sizeof(void*) * vector->capacity;
+      vector->capacity *= 2;
+      size_t num_bytes = sizeof(void*) * vector->capacity;
+      void** temp = gumbo_parser_allocate(parser, num_bytes);
+      memcpy(temp, vector->data, old_num_bytes);
+      gumbo_parser_deallocate(parser, vector->data);
+      vector->data = temp;
+    } else {
+      // 0-capacity vector; no previous array to deallocate.
+      vector->capacity = 2;
+      vector->data =
+          gumbo_parser_allocate(parser, sizeof(void*) * vector->capacity);
+    }
+  }
+}
+
+void gumbo_vector_add(
+    struct GumboInternalParser* parser, void* element, GumboVector* vector) {
+  enlarge_vector_if_full(parser, vector);
+  assert(vector->data);
+  assert(vector->length < vector->capacity);
+  vector->data[vector->length++] = element;
+}
+
+void* gumbo_vector_pop(
+    struct GumboInternalParser* parser, GumboVector* vector) {
+  if (vector->length == 0) {
+    return NULL;
+  }
+  return vector->data[--vector->length];
+}
+
+int gumbo_vector_index_of(GumboVector* vector, const void* element) {
+  for (unsigned int i = 0; i < vector->length; ++i) {
+    if (vector->data[i] == element) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+void gumbo_vector_insert_at(struct GumboInternalParser* parser, void* element,
+    unsigned int index, GumboVector* vector) {
+  assert(index >= 0);
+  assert(index <= vector->length);
+  enlarge_vector_if_full(parser, vector);
+  ++vector->length;
+  memmove(&vector->data[index + 1], &vector->data[index],
+      sizeof(void*) * (vector->length - index - 1));
+  vector->data[index] = element;
+}
+
+void gumbo_vector_remove(
+    struct GumboInternalParser* parser, void* node, GumboVector* vector) {
+  int index = gumbo_vector_index_of(vector, node);
+  if (index == -1) {
+    return;
+  }
+  gumbo_vector_remove_at(parser, index, vector);
+}
+
+void* gumbo_vector_remove_at(struct GumboInternalParser* parser,
+    unsigned int index, GumboVector* vector) {
+  assert(index >= 0);
+  assert(index < vector->length);
+  void* result = vector->data[index];
+  memmove(&vector->data[index], &vector->data[index + 1],
+      sizeof(void*) * (vector->length - index - 1));
+  --vector->length;
+  return result;
+}