--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/extract/src/astring.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,60 @@
+#ifndef ARTIFEX_EXTRACT_AUTOSTRING_XML
+#define ARTIFEX_EXTRACT_AUTOSTRING_XML
+
+#include "extract/alloc.h"
+
+/* Only for internal use by extract code.  */
+
+/* A simple string struct that reallocs as required. */
+typedef struct
+{
+	char   *chars;      /* NULL or zero-terminated. */
+	size_t  chars_num;  /* Length of string pointed to by .chars. */
+} extract_astring_t;
+
+/* Initialises <string> so it is ready for use. */
+void extract_astring_init(extract_astring_t *string);
+
+/* Frees any existing data and returns with <string> ready for use as if by
+extract_astring_init(). */
+void extract_astring_free(extract_alloc_t *alloc, extract_astring_t *string);
+
+int extract_astring_catl(extract_alloc_t *alloc, extract_astring_t *string, const char *s, size_t s_len);
+
+int extract_astring_catc(extract_alloc_t *alloc, extract_astring_t *string, char c);
+
+int extract_astring_cat(extract_alloc_t *alloc, extract_astring_t *string, const char *s);
+int extract_astring_catf(extract_alloc_t *alloc, extract_astring_t *string, const char *format, ...);
+
+/* Removes last <len> chars. */
+int extract_astring_truncate(extract_astring_t *content, int len);
+
+/* Removes last char if it is <c>. */
+int extract_astring_char_truncate_if(extract_astring_t *content, char c);
+
+/* Appends specified character using XML escapes as necessary. */
+int extract_astring_cat_xmlc(extract_alloc_t *alloc, extract_astring_t *string, int c);
+
+/* Appends unicode character <c> to <string>.
+	xml:
+		If true, we use XML escape sequences for special characters
+		such as '<' and unicode values above 127. Otherwise we encode
+		as utf8.
+	ascii_ligatures: if true we expand ligatures to "fl", "fi" etc.
+	ascii_dash:
+		If true we replace unicode dash characters with '-'.
+	ascii_apostrophe:
+		If true we replace unicode apostrophe with ascii single-quote "'".
+*/
+int extract_astring_catc_unicode(extract_alloc_t   *alloc,
+				extract_astring_t *string,
+				int c,
+				int xml,
+				int ascii_ligatures,
+				int ascii_dash,
+				int ascii_apostrophe);
+
+/* Appends specific unicode character, using XML escape sequences as required. */
+int extract_astring_catc_unicode_xml(extract_alloc_t *alloc, extract_astring_t *string, int c);
+
+#endif