1 files changed, 87 insertions, 0 deletions
diff --git a/lib/sqfs/src/io/unix.c b/lib/sqfs/src/io/unix.c
new file mode 100644
index 0000000..45af2ce
--- /dev/null
+++ b/lib/sqfs/src/io/unix.c
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * unix.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "config.h"
+
+#include "sqfs/io.h"
+#include "sqfs/error.h"
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+int sqfs_open_native_file(sqfs_file_handle_t *out, const char *filename,
+			  sqfs_u32 flags)
+{
+	int open_mode;
+
+	*out = -1;
+
+	if (flags & ~SQFS_FILE_OPEN_ALL_FLAGS)
+		return SQFS_ERROR_UNSUPPORTED;
+
+	if (flags & SQFS_FILE_OPEN_READ_ONLY) {
+		open_mode = O_RDONLY;
+	} else {
+		open_mode = O_CREAT | O_RDWR;
+
+		if (flags & SQFS_FILE_OPEN_OVERWRITE) {
+			open_mode |= O_TRUNC;
+		} else {
+			open_mode |= O_EXCL;
+		}
+	}
+
+	*out = open(filename, open_mode, 0644);
+
+	return (*out < 0) ? SQFS_ERROR_IO : 0;
+}
+
+void sqfs_close_native_file(sqfs_file_handle_t fd)
+{
+	while (close(fd) != 0 && errno == EINTR)
+		;
+}
+
+int sqfs_duplicate_native_file(sqfs_file_handle_t in, sqfs_file_handle_t *out)
+{
+	*out = dup(in);
+	return (*out < 0) ? SQFS_ERROR_IO : 0;
+}
+
+int sqfs_seek_native_file(sqfs_file_handle_t fd,
+			  sqfs_s64 offset, sqfs_u32 flags)
+{
+	int whence;
+	off_t off;
+
+	switch (flags & SQFS_FILE_SEEK_TYPE_MASK) {
+	case SQFS_FILE_SEEK_START:   whence = SEEK_SET; break;
+	case SQFS_FILE_SEEK_CURRENT: whence = SEEK_CUR; break;
+	case SQFS_FILE_SEEK_END:     whence = SEEK_END; break;
+	default:                     return SQFS_ERROR_UNSUPPORTED;
+	}
+
+	if (flags & ~(SQFS_FILE_SEEK_FLAG_MASK | SQFS_FILE_SEEK_TYPE_MASK))
+		return SQFS_ERROR_UNSUPPORTED;
+
+	off = lseek(fd, offset, whence);
+	if (off == ((off_t)-1)) {
+		if (errno == ESPIPE)
+			return SQFS_ERROR_UNSUPPORTED;
+		return SQFS_ERROR_IO;
+	}
+
+	if (flags & SQFS_FILE_SEEK_TRUNCATE) {
+		while (ftruncate(fd, off) != 0) {
+			if (errno != EINTR)
+				return SQFS_ERROR_IO;
+		}
+	}
+
+	return 0;
+}