--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/extract/src/sys.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,35 @@
+#ifndef EXTRACT_SYS_H
+#define EXTRACT_SYS_H
+
+#include "extract/alloc.h"
+
+#include <stdio.h>
+
+
+int extract_systemf(extract_alloc_t* alloc, const char* format, ...);
+/* Like system() but takes printf-style format and args. Also, if we return +ve
+we set errno to EIO.
+
+On iOS we always -1:ENOTSUP because the system() function is not available. */
+
+int  extract_read_all(extract_alloc_t* alloc, FILE* in, char** o_out);
+/* Reads until eof into zero-terminated malloc'd buffer. */
+
+int  extract_read_all_path(extract_alloc_t* alloc, const char* path, char** o_text);
+/* Reads entire file into zero-terminated malloc'd buffer. */
+
+int  extract_write_all(const void* data, size_t data_size, const char* path);
+
+int extract_check_path_shell_safe(const char* path);
+/* Returns -1 with errno=EINVAL if <path> contains sequences that could make it
+unsafe in shell commands. */
+
+int extract_remove_directory(extract_alloc_t* alloc, const char* path);
+/* Internally calls extract_systemf(); returns error if
+extract_check_path_shell_safe(path) returns an error, but this is probably not
+to be relied on. */
+
+int extract_mkdir(const char* path, int mode);
+/* Compatibility wrapper to cope on Windows. */
+
+#endif