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-rw-r--r--include/sqfs/data_writer.h9
-rw-r--r--lib/sqfs/data_writer/block.c3
2 files changed, 12 insertions, 0 deletions
diff --git a/include/sqfs/data_writer.h b/include/sqfs/data_writer.h
index a895b7a..210a08d 100644
--- a/include/sqfs/data_writer.h
+++ b/include/sqfs/data_writer.h
@@ -125,6 +125,15 @@ struct sqfs_block_hooks_t {
* fragment block.
*/
void (*notify_fragment_discard)(void *user, const sqfs_block_t *block);
+
+ /**
+ * @brief Gets called before writing a block of padding bytes to disk.
+ *
+ * @param user A user pointer.
+ * @param block The padding bytes that are about to be written.
+ * @param count The number of padding bytes in the block.
+ */
+ void (*prepare_padding)(void *user, sqfs_u8 *block, size_t count);
};
#ifdef __cplusplus
diff --git a/lib/sqfs/data_writer/block.c b/lib/sqfs/data_writer/block.c
index 7c52bb4..01e1387 100644
--- a/lib/sqfs/data_writer/block.c
+++ b/lib/sqfs/data_writer/block.c
@@ -70,6 +70,9 @@ static int allign_file(sqfs_data_writer_t *proc, sqfs_block_t *blk)
if (padding == 0)
return SQFS_ERROR_ALLOC;
+ if (proc->hooks != NULL && proc->hooks->prepare_padding != NULL)
+ proc->hooks->prepare_padding(proc->user_ptr, padding, diff);
+
chksum = crc32(0, padding, diff);
ret = proc->file->write_at(proc->file, size, padding, diff);