--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/extract/src/mem.c	Mon Sep 15 11:44:09 2025 +0200
@@ -0,0 +1,66 @@
+#include "extract/alloc.h"
+
+#include "mem.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "compat_va_copy.h"
+
+
+void extract_bzero(void *b, size_t len)
+{
+	memset(b, 0, len);
+}
+
+int extract_vasprintf(extract_alloc_t *alloc, char **out, const char *format, va_list va)
+{
+	int n;
+	int ret;
+	va_list va2;
+
+	va_copy(va2, va);
+	n = vsnprintf(NULL, 0, format, va);
+	if (n < 0)
+	{
+		ret = n;
+		goto end;
+	}
+	if (extract_malloc(alloc, out, n + 1))
+	{
+		ret = -1;
+		goto end;
+	}
+	vsnprintf(*out, n + 1, format, va2);
+
+	ret = 0;
+end:
+
+	va_end(va2);
+
+	return ret;
+}
+
+
+int extract_asprintf(extract_alloc_t *alloc, char **out, const char *format, ...)
+{
+	va_list va;
+	int     ret;
+
+	va_start(va, format);
+	ret = extract_vasprintf(alloc, out, format, va);
+	va_end(va);
+
+	return ret;
+}
+
+int extract_strdup(extract_alloc_t *alloc, const char *s, char **o_out)
+{
+	size_t l = strlen(s) + 1;
+
+	if (extract_malloc(alloc, o_out, l)) return -1;
+	memcpy(*o_out, s, l);
+
+	return 0;
+}