Move data writer to libsqfs.a

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 49 insertions, 0 deletions

diff --git a/include/data_writer.h b/include/data_writer.h
new file mode 100644
index 0000000..cafe61e
--- /dev/null
+++ b/include/data_writer.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#ifndef DATA_WRITER_H
+#define DATA_WRITER_H
+
+#include "squashfs.h"
+#include "compress.h"
+#include "fstree.h"
+
+typedef struct data_writer_t data_writer_t;
+
+/*
+  Create a data writer. The pointer to the super block is kept internally and
+  used to automatically update various counters when writing data.
+
+  Returns NULL on failure and prints errors to stderr.
+ */
+data_writer_t *data_writer_create(sqfs_super_t *super, compressor_t *cmp,
+				  int outfd);
+
+void data_writer_destroy(data_writer_t *data);
+
+/*
+  Write the finalfragment table to the underlying file.
+
+  Returns 0 on success, prints errors to stderr.
+*/
+int data_writer_write_fragment_table(data_writer_t *data);
+
+/*
+  Compress and flush the current fragment buffer even if it is not full yet.
+
+  Returns 0 on success, prints errors to stderr.
+*/
+int data_writer_flush_fragments(data_writer_t *data);
+
+/*
+  Read data from the given file descriptor, partition it into blocks and
+  write them out (possibly compressed) to the underlying file. If the size
+  is not a multiple of the block size, the last bit is kept in an internal
+  fragment buffer which is written out if full.
+
+  The file_info_t object is updated accordingly and used to determine the
+  number of bytes to write and the input file name to report errors.
+
+  Returns 0 on success, prints errors to stderr.
+*/
+int write_data_from_fd(data_writer_t *data, file_info_t *fi, int infd);
+
+#endif /* DATA_WRITER_H */