--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/extract/src/sys.c	Mon Sep 15 11:44:09 2025 +0200
@@ -0,0 +1,138 @@
+#include "mem.h"
+#include "outf.h"
+#include "sys.h"
+
+#include <errno.h>
+#include <stdarg.h>
+
+#include <sys/stat.h>
+
+
+/* Define extract_APPLE_IOS if we are on iOS. */
+#undef extract_APPLE_IOS
+#ifdef __APPLE__
+	#include "TargetConditionals.h"
+	#ifdef TARGET_OS_IPHONE
+		#define extract_APPLE_IOS
+	#elif TARGET_IPHONE_SIMULATOR
+		#define extract_APPLE_IOS
+	#endif
+#endif
+
+int extract_systemf(extract_alloc_t *alloc, const char *format, ...)
+{
+#ifdef extract_APPLE_IOS
+	/* system() not available on iOS. */
+	(void) alloc;
+	(void) format;
+	errno = ENOTSUP;
+	return -1;
+#else
+
+	int      e;
+	char    *command;
+	va_list  va;
+
+	va_start(va, format);
+	e = extract_vasprintf(alloc, &command, format, va);
+	va_end(va);
+	if (e < 0) return e;
+	outf("running: %s", command);
+	e = system(command);
+	extract_free(alloc, &command);
+	if (e > 0) {
+		errno = EIO;
+	}
+	return e;
+
+#endif
+}
+
+int  extract_read_all(extract_alloc_t *alloc, FILE *in, char **o_out)
+{
+	size_t  len = 0;
+	size_t  delta = 128;
+	for(;;) {
+		size_t n;
+		if (extract_realloc2(alloc, o_out, len, len + delta + 1)) {
+			extract_free(alloc, o_out);
+			return -1;
+		}
+		n = fread(*o_out + len, 1 /*size*/, delta /*nmemb*/, in);
+		len += n;
+		if (feof(in)) {
+			(*o_out)[len] = 0;
+			return 0;
+		}
+		if (ferror(in)) {
+			/* It's weird that fread() and ferror() don't set errno. */
+			errno = EIO;
+			extract_free(alloc, o_out);
+			return -1;
+		}
+	}
+}
+
+int  extract_read_all_path(extract_alloc_t *alloc, const char *path, char **o_text)
+{
+	int e = -1;
+	FILE *f = NULL;
+	f = fopen(path, "rb");
+	if (!f) goto end;
+	if (extract_read_all(alloc, f, o_text)) goto end;
+	e = 0;
+	end:
+	if (f) fclose(f);
+	if (e) extract_free(alloc, o_text);
+	return e;
+}
+
+int  extract_write_all(const void *data, size_t data_size, const char *path)
+{
+	int e = -1;
+	FILE *f = fopen(path, "w");
+	if (!f) goto end;
+	if (fwrite(data, data_size, 1 /*nmemb*/, f) != 1) goto end;
+	e = 0;
+	end:
+	if (f) fclose(f);
+	return e;
+}
+
+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. */
+{
+	if (0
+			|| strstr(path, "..")
+			|| strchr(path, '\'')
+			|| strchr(path, '"')
+			|| strchr(path, ' ')
+			) {
+		errno = EINVAL;
+		return -1;
+	}
+	return 0;
+}
+int extract_remove_directory(extract_alloc_t *alloc, const char *path)
+{
+	if (extract_check_path_shell_safe(path)) {
+		outf("path_out is unsafe: %s", path);
+		return -1;
+	}
+	return extract_systemf(alloc, "rm -r '%s'", path);
+}
+
+#ifdef _WIN32
+#include <direct.h>
+int extract_mkdir(const char *path, int mode)
+{
+	(void) mode;
+	return _mkdir(path);
+}
+#else
+int extract_mkdir(const char *path, int mode)
+{
+	return mkdir(path, mode);
+}
+#endif