libsqfs: Add a sqfs_block_processor_create_ex function

This function creates a block processor from a structure describing it.
A stub implementation for the old sqfs_block_processor_create is added
that simply sets up such a struct and forwards the call.

The current version of the description struct only contains the exact
same parameters and a size field at the beginning.

This approach is supposed to make extending the range of parameters
easier without breaking ABI compatibillity.

Currently already planned are:
 - Adding a sqfs_file_t pointer to double-check when deduplicating
   fragments.
 - When the scanning code reaches a usable state, add the abillity
   to pass scanned fragment data, so the block processor can be used
   for appending to an existing image.

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

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/sqfs/block_processor/internal.h b/lib/sqfs/block_processor/internal.h
index 883385b..efea3d4 100644
--- a/lib/sqfs/block_processor/internal.h
+++ b/lib/sqfs/block_processor/internal.h
@@ -81,6 +81,9 @@ struct sqfs_block_processor_t {
 
 	bool begin_called;
 
+	sqfs_file_t *file;
+	sqfs_compressor_t *uncmp;
+
 	int (*process_completed_block)(sqfs_block_processor_t *proc,
 				       sqfs_block_t *block);
 
@@ -100,9 +103,6 @@ struct sqfs_block_processor_t {
 SQFS_INTERNAL void block_processor_cleanup(sqfs_block_processor_t *base);
 
 SQFS_INTERNAL int block_processor_init(sqfs_block_processor_t *base,
-				       size_t max_block_size,
-				       sqfs_compressor_t *cmp,
-				       sqfs_block_writer_t *wr,
-				       sqfs_frag_table_t *tbl);
+				       const sqfs_block_processor_desc_t *desc);
 
 #endif /* INTERNAL_H */