--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/gumbo-parser/src/gumbo.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,673 @@
+// 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)
+//
+// We use Gumbo as a prefix for types, gumbo_ as a prefix for functions, and
+// GUMBO_ as a prefix for enum constants (static constants get the Google-style
+// kGumbo prefix).
+
+/**
+ * @file
+ * @mainpage Gumbo HTML Parser
+ *
+ * This provides a conformant, no-dependencies implementation of the HTML5
+ * parsing algorithm.  It supports only UTF8; if you need to parse a different
+ * encoding, run a preprocessing step to convert to UTF8.  It returns a parse
+ * tree made of the structs in this file.
+ *
+ * Example:
+ * @code
+ *    GumboOutput* output = gumbo_parse(input);
+ *    do_something_with_doctype(output->document);
+ *    do_something_with_html_tree(output->root);
+ *    gumbo_destroy_output(&options, output);
+ * @endcode
+ * HTML5 Spec:
+ *
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/syntax.html
+ */
+
+#ifndef GUMBO_GUMBO_H_
+#define GUMBO_GUMBO_H_
+
+#ifdef _MSC_VER
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+#define fileno _fileno
+#endif
+
+#include <stdbool.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * A struct representing a character position within the original text buffer.
+ * Line and column numbers are 1-based and offsets are 0-based, which matches
+ * how most editors and command-line tools work.  Also, columns measure
+ * positions in terms of characters while offsets measure by bytes; this is
+ * because the offset field is often used to pull out a particular region of
+ * text (which in most languages that bind to C implies pointer arithmetic on a
+ * buffer of bytes), while the column field is often used to reference a
+ * particular column on a printable display, which nowadays is usually UTF-8.
+ */
+typedef struct {
+  unsigned int line;
+  unsigned int column;
+  unsigned int offset;
+} GumboSourcePosition;
+
+/**
+ * A SourcePosition used for elements that have no source position, i.e.
+ * parser-inserted elements.
+ */
+extern const GumboSourcePosition kGumboEmptySourcePosition;
+
+/**
+ * A struct representing a string or part of a string.  Strings within the
+ * parser are represented by a char* and a length; the char* points into
+ * an existing data buffer owned by some other code (often the original input).
+ * GumboStringPieces are assumed (by convention) to be immutable, because they
+ * may share data.  Use GumboStringBuffer if you need to construct a string.
+ * Clients should assume that it is not NUL-terminated, and should always use
+ * explicit lengths when manipulating them.
+ */
+typedef struct {
+  /** A pointer to the beginning of the string.  NULL iff length == 0. */
+  const char* data;
+
+  /** The length of the string fragment, in bytes.  May be zero. */
+  size_t length;
+} GumboStringPiece;
+
+/** A constant to represent a 0-length null string. */
+extern const GumboStringPiece kGumboEmptyString;
+
+/**
+ * Compares two GumboStringPieces, and returns true if they're equal or false
+ * otherwise.
+ */
+bool gumbo_string_equals(
+    const GumboStringPiece* str1, const GumboStringPiece* str2);
+
+/**
+ * Compares two GumboStringPieces ignoring case, and returns true if they're
+ * equal or false otherwise.
+ */
+bool gumbo_string_equals_ignore_case(
+    const GumboStringPiece* str1, const GumboStringPiece* str2);
+
+/**
+ * A simple vector implementation.  This stores a pointer to a data array and a
+ * length.  All elements are stored as void*; client code must cast to the
+ * appropriate type.  Overflows upon addition result in reallocation of the data
+ * array, with the size doubling to maintain O(1) amortized cost.  There is no
+ * removal function, as this isn't needed for any of the operations within this
+ * library.  Iteration can be done through inspecting the structure directly in
+ * a for-loop.
+ */
+typedef struct {
+  /** Data elements.  This points to a dynamically-allocated array of capacity
+   * elements, each a void* to the element itself.
+   */
+  void** data;
+
+  /** Number of elements currently in the vector. */
+  unsigned int length;
+
+  /** Current array capacity. */
+  unsigned int capacity;
+} GumboVector;
+
+/** An empty (0-length, 0-capacity) GumboVector. */
+extern const GumboVector kGumboEmptyVector;
+
+/**
+ * Returns the first index at which an element appears in this vector (testing
+ * by pointer equality), or -1 if it never does.
+ */
+int gumbo_vector_index_of(GumboVector* vector, const void* element);
+
+/**
+ * An enum for all the tags defined in the HTML5 standard.  These correspond to
+ * the tag names themselves.  Enum constants exist only for tags which appear in
+ * the spec itself (or for tags with special handling in the SVG and MathML
+ * namespaces); any other tags appear as GUMBO_TAG_UNKNOWN and the actual tag
+ * name can be obtained through original_tag.
+ *
+ * This is mostly for API convenience, so that clients of this library don't
+ * need to perform a strcasecmp to find the normalized tag name.  It also has
+ * efficiency benefits, by letting the parser work with enums instead of
+ * strings.
+ */
+typedef enum {
+// Load all the tags from an external source, generated from tag.in.
+#include "tag_enum.h"
+  // Used for all tags that don't have special handling in HTML.  Add new tags
+  // to the end of tag.in so as to preserve backwards-compatibility.
+  GUMBO_TAG_UNKNOWN,
+  // A marker value to indicate the end of the enum, for iterating over it.
+  // Also used as the terminator for varargs functions that take tags.
+  GUMBO_TAG_LAST,
+} GumboTag;
+
+/**
+ * Returns the normalized (usually all-lowercased, except for foreign content)
+ * tag name for an GumboTag enum.  Return value is static data owned by the
+ * library.
+ */
+const char* gumbo_normalized_tagname(GumboTag tag);
+
+/**
+ * Extracts the tag name from the original_text field of an element or token by
+ * stripping off </> characters and attributes and adjusting the passed-in
+ * GumboStringPiece appropriately.  The tag name is in the original case and
+ * shares a buffer with the original text, to simplify memory management.
+ * Behavior is undefined if a string-piece that doesn't represent an HTML tag
+ * (<tagname> or </tagname>) is passed in.  If the string piece is completely
+ * empty (NULL data pointer), then this function will exit successfully as a
+ * no-op.
+ */
+void gumbo_tag_from_original_text(GumboStringPiece* text);
+
+/**
+ * Fixes the case of SVG elements that are not all lowercase.
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/tree-construction.html#parsing-main-inforeign
+ * This is not done at parse time because there's no place to store a mutated
+ * tag name.  tag_name is an enum (which will be TAG_UNKNOWN for most SVG tags
+ * without special handling), while original_tag_name is a pointer into the
+ * original buffer.  Instead, we provide this helper function that clients can
+ * use to rename SVG tags as appropriate.
+ * Returns the case-normalized SVG tagname if a replacement is found, or NULL if
+ * no normalization is called for.  The return value is static data and owned by
+ * the library.
+ */
+const char* gumbo_normalize_svg_tagname(const GumboStringPiece* tagname);
+
+/**
+ * Converts a tag name string (which may be in upper or mixed case) to a tag
+ * enum. The `tag` version expects `tagname` to be NULL-terminated
+ */
+GumboTag gumbo_tag_enum(const char* tagname);
+GumboTag gumbo_tagn_enum(const char* tagname, size_t length);
+
+/**
+ * Attribute namespaces.
+ * HTML includes special handling for XLink, XML, and XMLNS namespaces on
+ * attributes.  Everything else goes in the generic "NONE" namespace.
+ */
+typedef enum {
+  GUMBO_ATTR_NAMESPACE_NONE,
+  GUMBO_ATTR_NAMESPACE_XLINK,
+  GUMBO_ATTR_NAMESPACE_XML,
+  GUMBO_ATTR_NAMESPACE_XMLNS,
+} GumboAttributeNamespaceEnum;
+
+/**
+ * A struct representing a single attribute on an HTML tag.  This is a
+ * name-value pair, but also includes information about source locations and
+ * original source text.
+ */
+typedef struct {
+  /**
+   * The namespace for the attribute.  This will usually be
+   * GUMBO_ATTR_NAMESPACE_NONE, but some XLink/XMLNS/XML attributes take special
+   * values, per:
+   * http://www.whatwg.org/specs/web-apps/current-work/multipage/tree-construction.html#adjust-foreign-attributes
+   */
+  GumboAttributeNamespaceEnum attr_namespace;
+
+  /**
+   * The name of the attribute.  This is in a freshly-allocated buffer to deal
+   * with case-normalization, and is null-terminated.
+   */
+  const char* name;
+
+  /**
+   * The original text of the attribute name, as a pointer into the original
+   * source buffer.
+   */
+  GumboStringPiece original_name;
+
+  /**
+   * The value of the attribute.  This is in a freshly-allocated buffer to deal
+   * with unescaping, and is null-terminated.  It does not include any quotes
+   * that surround the attribute.  If the attribute has no value (for example,
+   * 'selected' on a checkbox), this will be an empty string.
+   */
+  const char* value;
+
+  /**
+   * The original text of the value of the attribute.  This points into the
+   * original source buffer.  It includes any quotes that surround the
+   * attribute, and you can look at original_value.data[0] and
+   * original_value.data[original_value.length - 1] to determine what the quote
+   * characters were.  If the attribute has no value, this will be a 0-length
+   * string.
+   */
+  GumboStringPiece original_value;
+
+  /** The starting position of the attribute name. */
+  GumboSourcePosition name_start;
+
+  /**
+   * The ending position of the attribute name.  This is not always derivable
+   * from the starting position of the value because of the possibility of
+   * whitespace around the = sign.
+   */
+  GumboSourcePosition name_end;
+
+  /** The starting position of the attribute value. */
+  GumboSourcePosition value_start;
+
+  /** The ending position of the attribute value. */
+  GumboSourcePosition value_end;
+} GumboAttribute;
+
+/**
+ * Given a vector of GumboAttributes, look up the one with the specified name
+ * and return it, or NULL if no such attribute exists.  This uses a
+ * case-insensitive match, as HTML is case-insensitive.
+ */
+GumboAttribute* gumbo_get_attribute(const GumboVector* attrs, const char* name);
+
+/**
+ * Enum denoting the type of node.  This determines the type of the node.v
+ * union.
+ */
+typedef enum {
+  /** Document node.  v will be a GumboDocument. */
+  GUMBO_NODE_DOCUMENT,
+  /** Element node.  v will be a GumboElement. */
+  GUMBO_NODE_ELEMENT,
+  /** Text node.  v will be a GumboText. */
+  GUMBO_NODE_TEXT,
+  /** CDATA node. v will be a GumboText. */
+  GUMBO_NODE_CDATA,
+  /** Comment node.  v will be a GumboText, excluding comment delimiters. */
+  GUMBO_NODE_COMMENT,
+  /** Text node, where all contents is whitespace.  v will be a GumboText. */
+  GUMBO_NODE_WHITESPACE,
+  /** Template node.  This is separate from GUMBO_NODE_ELEMENT because many
+   * client libraries will want to ignore the contents of template nodes, as
+   * the spec suggests.  Recursing on GUMBO_NODE_ELEMENT will do the right thing
+   * here, while clients that want to include template contents should also
+   * check for GUMBO_NODE_TEMPLATE.  v will be a GumboElement.  */
+  GUMBO_NODE_TEMPLATE
+} GumboNodeType;
+
+/**
+ * Forward declaration of GumboNode so it can be used recursively in
+ * GumboNode.parent.
+ */
+typedef struct GumboInternalNode GumboNode;
+
+/**
+ * http://www.whatwg.org/specs/web-apps/current-work/complete/dom.html#quirks-mode
+ */
+typedef enum {
+  GUMBO_DOCTYPE_NO_QUIRKS,
+  GUMBO_DOCTYPE_QUIRKS,
+  GUMBO_DOCTYPE_LIMITED_QUIRKS
+} GumboQuirksModeEnum;
+
+/**
+ * Namespaces.
+ * Unlike in X(HT)ML, namespaces in HTML5 are not denoted by a prefix.  Rather,
+ * anything inside an <svg> tag is in the SVG namespace, anything inside the
+ * <math> tag is in the MathML namespace, and anything else is inside the HTML
+ * namespace.  No other namespaces are supported, so this can be an enum only.
+ */
+typedef enum {
+  GUMBO_NAMESPACE_HTML,
+  GUMBO_NAMESPACE_SVG,
+  GUMBO_NAMESPACE_MATHML
+} GumboNamespaceEnum;
+
+/**
+ * Parse flags.
+ * We track the reasons for parser insertion of nodes and store them in a
+ * bitvector in the node itself.  This lets client code optimize out nodes that
+ * are implied by the HTML structure of the document, or flag constructs that
+ * may not be allowed by a style guide, or track the prevalence of incorrect or
+ * tricky HTML code.
+ */
+typedef enum {
+  /**
+   * A normal node - both start and end tags appear in the source, nothing has
+   * been reparented.
+   */
+  GUMBO_INSERTION_NORMAL = 0,
+
+  /**
+   * A node inserted by the parser to fulfill some implicit insertion rule.
+   * This is usually set in addition to some other flag giving a more specific
+   * insertion reason; it's a generic catch-all term meaning "The start tag for
+   * this node did not appear in the document source".
+   */
+  GUMBO_INSERTION_BY_PARSER = 1 << 0,
+
+  /**
+   * A flag indicating that the end tag for this node did not appear in the
+   * document source.  Note that in some cases, you can still have
+   * parser-inserted nodes with an explicit end tag: for example, "Text</html>"
+   * has GUMBO_INSERTED_BY_PARSER set on the <html> node, but
+   * GUMBO_INSERTED_END_TAG_IMPLICITLY is unset, as the </html> tag actually
+   * exists.  This flag will be set only if the end tag is completely missing;
+   * in some cases, the end tag may be misplaced (eg. a </body> tag with text
+   * afterwards), which will leave this flag unset and require clients to
+   * inspect the parse errors for that case.
+   */
+  GUMBO_INSERTION_IMPLICIT_END_TAG = 1 << 1,
+
+  // Value 1 << 2 was for a flag that has since been removed.
+
+  /**
+   * A flag for nodes that are inserted because their presence is implied by
+   * other tags, eg. <html>, <head>, <body>, <tbody>, etc.
+   */
+  GUMBO_INSERTION_IMPLIED = 1 << 3,
+
+  /**
+   * A flag for nodes that are converted from their end tag equivalents.  For
+   * example, </p> when no paragraph is open implies that the parser should
+   * create a <p> tag and immediately close it, while </br> means the same thing
+   * as <br>.
+   */
+  GUMBO_INSERTION_CONVERTED_FROM_END_TAG = 1 << 4,
+
+  /** A flag for nodes that are converted from the parse of an <isindex> tag. */
+  GUMBO_INSERTION_FROM_ISINDEX = 1 << 5,
+
+  /** A flag for <image> tags that are rewritten as <img>. */
+  GUMBO_INSERTION_FROM_IMAGE = 1 << 6,
+
+  /**
+   * A flag for nodes that are cloned as a result of the reconstruction of
+   * active formatting elements.  This is set only on the clone; the initial
+   * portion of the formatting run is a NORMAL node with an IMPLICIT_END_TAG.
+   */
+  GUMBO_INSERTION_RECONSTRUCTED_FORMATTING_ELEMENT = 1 << 7,
+
+  /** A flag for nodes that are cloned by the adoption agency algorithm. */
+  GUMBO_INSERTION_ADOPTION_AGENCY_CLONED = 1 << 8,
+
+  /** A flag for nodes that are moved by the adoption agency algorithm. */
+  GUMBO_INSERTION_ADOPTION_AGENCY_MOVED = 1 << 9,
+
+  /**
+   * A flag for nodes that have been foster-parented out of a table (or
+   * should've been foster-parented, if verbatim mode is set).
+   */
+  GUMBO_INSERTION_FOSTER_PARENTED = 1 << 10,
+} GumboParseFlags;
+
+/**
+ * Information specific to document nodes.
+ */
+typedef struct {
+  /**
+   * An array of GumboNodes, containing the children of this element.  This will
+   * normally consist of the <html> element and any comment nodes found.
+   * Pointers are owned.
+   */
+  GumboVector /* GumboNode* */ children;
+
+  // True if there was an explicit doctype token as opposed to it being omitted.
+  bool has_doctype;
+
+  // Fields from the doctype token, copied verbatim.
+  const char* name;
+  const char* public_identifier;
+  const char* system_identifier;
+
+  /**
+   * Whether or not the document is in QuirksMode, as determined by the values
+   * in the GumboTokenDocType template.
+   */
+  GumboQuirksModeEnum doc_type_quirks_mode;
+} GumboDocument;
+
+/**
+ * The struct used to represent TEXT, CDATA, COMMENT, and WHITESPACE elements.
+ * This contains just a block of text and its position.
+ */
+typedef struct {
+  /**
+   * The text of this node, after entities have been parsed and decoded.  For
+   * comment/cdata nodes, this does not include the comment delimiters.
+   */
+  const char* text;
+
+  /**
+   * The original text of this node, as a pointer into the original buffer.  For
+   * comment/cdata nodes, this includes the comment delimiters.
+   */
+  GumboStringPiece original_text;
+
+  /**
+   * The starting position of this node.  This corresponds to the position of
+   * original_text, before entities are decoded.
+   * */
+  GumboSourcePosition start_pos;
+} GumboText;
+
+/**
+ * The struct used to represent all HTML elements.  This contains information
+ * about the tag, attributes, and child nodes.
+ */
+typedef struct {
+  /**
+   * An array of GumboNodes, containing the children of this element.  Pointers
+   * are owned.
+   */
+  GumboVector /* GumboNode* */ children;
+
+  /** The GumboTag enum for this element. */
+  GumboTag tag;
+
+  /** The GumboNamespaceEnum for this element. */
+  GumboNamespaceEnum tag_namespace;
+
+  /**
+   * A GumboStringPiece pointing to the original tag text for this element,
+   * pointing directly into the source buffer.  If the tag was inserted
+   * algorithmically (for example, <head> or <tbody> insertion), this will be a
+   * zero-length string.
+   */
+  GumboStringPiece original_tag;
+
+  /**
+   * A GumboStringPiece pointing to the original end tag text for this element.
+   * If the end tag was inserted algorithmically, (for example, closing a
+   * self-closing tag), this will be a zero-length string.
+   */
+  GumboStringPiece original_end_tag;
+
+  /** The source position for the start of the start tag. */
+  GumboSourcePosition start_pos;
+
+  /** The source position for the start of the end tag. */
+  GumboSourcePosition end_pos;
+
+  /**
+   * An array of GumboAttributes, containing the attributes for this tag in the
+   * order that they were parsed.  Pointers are owned.
+   */
+  GumboVector /* GumboAttribute* */ attributes;
+} GumboElement;
+
+/**
+ * A supertype for GumboElement and GumboText, so that we can include one
+ * generic type in lists of children and cast as necessary to subtypes.
+ */
+struct GumboInternalNode {
+  /** The type of node that this is. */
+  GumboNodeType type;
+
+  /** Pointer back to parent node.  Not owned. */
+  GumboNode* parent;
+
+  /** The index within the parent's children vector of this node. */
+  size_t index_within_parent;
+
+  /**
+   * A bitvector of flags containing information about why this element was
+   * inserted into the parse tree, including a variety of special parse
+   * situations.
+   */
+  GumboParseFlags parse_flags;
+
+  /** The actual node data. */
+  union {
+    GumboDocument document;  // For GUMBO_NODE_DOCUMENT.
+    GumboElement element;    // For GUMBO_NODE_ELEMENT.
+    GumboText text;          // For everything else.
+  } v;
+};
+
+/**
+ * The type for an allocator function.  Takes the 'userdata' member of the
+ * GumboParser struct as its first argument.  Semantics should be the same as
+ * malloc, i.e. return a block of size_t bytes on success or NULL on failure.
+ * Allocating a block of 0 bytes behaves as per malloc.
+ */
+// TODO(jdtang): Add checks throughout the codebase for out-of-memory condition.
+typedef void* (*GumboAllocatorFunction)(void* userdata, size_t size);
+
+/**
+ * The type for a deallocator function.  Takes the 'userdata' member of the
+ * GumboParser struct as its first argument.
+ */
+typedef void (*GumboDeallocatorFunction)(void* userdata, void* ptr);
+
+/**
+ * Input struct containing configuration options for the parser.
+ * These let you specify alternate memory managers, provide different error
+ * handling, etc.
+ * Use kGumboDefaultOptions for sensible defaults, and only set what you need.
+ */
+typedef struct GumboInternalOptions {
+  /** A memory allocator function.  Default: malloc. */
+  GumboAllocatorFunction allocator;
+
+  /** A memory deallocator function. Default: free. */
+  GumboDeallocatorFunction deallocator;
+
+  /**
+   * An opaque object that's passed in as the first argument to all callbacks
+   * used by this library.  Default: NULL.
+   */
+  void* userdata;
+
+  /**
+   * The tab-stop size, for computing positions in source code that uses tabs.
+   * Default: 8.
+   */
+  int tab_stop;
+
+  /**
+   * Whether or not to stop parsing when the first error is encountered.
+   * Default: false.
+   */
+  bool stop_on_first_error;
+
+  /**
+   * The maximum number of errors before the parser stops recording them.  This
+   * is provided so that if the page is totally borked, we don't completely fill
+   * up the errors vector and exhaust memory with useless redundant errors.  Set
+   * to -1 to disable the limit.
+   * Default: -1
+   */
+  int max_errors;
+
+  /**
+   * The fragment context for parsing:
+   * https://html.spec.whatwg.org/multipage/syntax.html#parsing-html-fragments
+   *
+   * If GUMBO_TAG_LAST is passed here, it is assumed to be "no fragment", i.e.
+   * the regular parsing algorithm.  Otherwise, pass the tag enum for the
+   * intended parent of the parsed fragment.  We use just the tag enum rather
+   * than a full node because that's enough to set all the parsing context we
+   * need, and it provides some additional flexibility for client code to act as
+   * if parsing a fragment even when a full HTML tree isn't available.
+   *
+   * Default: GUMBO_TAG_LAST
+   */
+  GumboTag fragment_context;
+
+  /**
+   * The namespace for the fragment context.  This lets client code
+   * differentiate between, say, parsing a <title> tag in SVG vs. parsing it in
+   * HTML.
+   * Default: GUMBO_NAMESPACE_HTML
+   */
+  GumboNamespaceEnum fragment_namespace;
+} GumboOptions;
+
+/** Default options struct; use this with gumbo_parse_with_options. */
+extern const GumboOptions kGumboDefaultOptions;
+
+/** The output struct containing the results of the parse. */
+typedef struct GumboInternalOutput {
+  /**
+   * Pointer to the document node.  This is a GumboNode of type NODE_DOCUMENT
+   * that contains the entire document as its child.
+   */
+  GumboNode* document;
+
+  /**
+   * Pointer to the root node.  This the <html> tag that forms the root of the
+   * document.
+   */
+  GumboNode* root;
+
+  /**
+   * A list of errors that occurred during the parse.
+   * NOTE: In version 1.0 of this library, the API for errors hasn't been fully
+   * fleshed out and may change in the future.  For this reason, the GumboError
+   * header isn't part of the public API.  Contact us if you need errors
+   * reported so we can work out something appropriate for your use-case.
+   */
+  GumboVector /* GumboError */ errors;
+} GumboOutput;
+
+/**
+ * Parses a buffer of UTF8 text into an GumboNode parse tree.  The buffer must
+ * live at least as long as the parse tree, as some fields (eg. original_text)
+ * point directly into the original buffer.
+ *
+ * This doesn't support buffers longer than 4 gigabytes.
+ */
+GumboOutput* gumbo_parse(const char* buffer);
+
+/**
+ * Extended version of gumbo_parse that takes an explicit options structure,
+ * buffer, and length.
+ */
+GumboOutput* gumbo_parse_with_options(
+    const GumboOptions* options, const char* buffer, size_t buffer_length);
+
+/** Release the memory used for the parse tree & parse errors. */
+void gumbo_destroy_output(const GumboOptions* options, GumboOutput* output);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // GUMBO_GUMBO_H_