--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/extract/src/text.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,96 @@
+#include "text.h"
+
+#include "astring.h"
+#include "outf.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+
+int
+extract_content_insert(
+		extract_alloc_t    *alloc,
+		const char         *original,
+		const char         *single_name,
+		const char         *mid_begin_name,
+		const char         *mid_end_name,
+		extract_astring_t  *contentss,
+		int                 contentss_num,
+		char              **o_out)
+{
+	int                e         = -1;
+	const char        *mid_begin = NULL;
+	const char        *mid_end   = NULL;
+	const char        *single    = NULL;
+	extract_astring_t  out;
+	extract_astring_init(&out);
+
+	assert(single_name || mid_begin_name || mid_end_name);
+
+	if (single_name) single = strstr(original, single_name);
+
+	if (single)
+	{
+		outf("Have found single_name='%s', using in preference to mid_begin_name=%s mid_end_name=%s",
+			 single_name,
+			 mid_begin_name,
+			 mid_end_name);
+		mid_begin = single;
+		mid_end = single + strlen(single_name);
+	}
+	else
+	{
+		if (mid_begin_name) {
+			mid_begin = strstr(original, mid_begin_name);
+			if (!mid_begin) {
+				outf("error: could not find '%s' in odt content", mid_begin_name);
+				errno = ESRCH;
+				goto end;
+			}
+			mid_begin += strlen(mid_begin_name);
+		}
+		if (mid_end_name) {
+			mid_end = strstr(mid_begin ? mid_begin : original, mid_end_name);
+			if (!mid_end) {
+				outf("error: could not find '%s' in odt content", mid_end_name);
+				e = -1;
+				errno = ESRCH;
+				goto end;
+			}
+		}
+		if (!mid_begin) {
+			mid_begin = mid_end;
+		}
+		if (!mid_end) {
+			mid_end = mid_begin;
+		}
+	}
+
+	if (extract_astring_catl(alloc, &out, original, mid_begin - original)) goto end;
+	{
+		int i;
+		for (i=0; i<contentss_num; ++i) {
+			if (extract_astring_catl(alloc, &out, contentss[i].chars, contentss[i].chars_num)) goto end;
+		}
+	}
+	assert( mid_end);
+	/* As per docs, at least one of <single_name>, <mid_begin_name> and
+	<mid_end_name> is non-null, and this ensures that mid_end must not be null.
+	*/
+	/* coverity[var_deref_model] */
+	if (extract_astring_cat(alloc, &out, mid_end)) goto end;
+
+	*o_out = out.chars;
+	out.chars = NULL;
+
+	e = 0;
+end:
+
+	if (e) {
+		extract_astring_free(alloc, &out);
+		*o_out = NULL;
+	}
+
+	return e;
+}