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, 1 insertions, 0 deletions

diff --git a/include/sqfs/predef.h b/include/sqfs/predef.h
index e0afac4..55ccc86 100644
--- a/include/sqfs/predef.h
+++ b/include/sqfs/predef.h
@@ -91,6 +91,7 @@ typedef struct sqfs_frag_table_t sqfs_frag_table_t;
 typedef struct sqfs_block_writer_t sqfs_block_writer_t;
 typedef struct sqfs_block_writer_stats_t sqfs_block_writer_stats_t;
 typedef struct sqfs_block_processor_stats_t sqfs_block_processor_stats_t;
+typedef struct sqfs_block_processor_desc_t sqfs_block_processor_desc_t;
 
 typedef struct sqfs_fragment_t sqfs_fragment_t;
 typedef struct sqfs_dir_header_t sqfs_dir_header_t;