summaryrefslogtreecommitdiff
path: root/lib/sqfs/data_reader.c
diff options
context:
space:
mode:
authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-03-03 19:43:54 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-03-04 00:58:53 +0100
commit44c81eeffe9c8820b1009a7a5c728782aa5ebf40 (patch)
tree544eceb6dc5633018e5147c88ca9b07dd0fb54d9 /lib/sqfs/data_reader.c
parent6f47796dc0761fac359ec59ce26c7af5154e538d (diff)
Add a generic copying mechanism to sqfs_object_t
This patch adds a deep-copy callback to sqfs_object_t and removes the copying mechanism from sqfs_compressor_t. This is also interesting for other types. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/sqfs/data_reader.c')
-rw-r--r--lib/sqfs/data_reader.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/sqfs/data_reader.c b/lib/sqfs/data_reader.c
index 5e985e0..cd9ad68 100644
--- a/lib/sqfs/data_reader.c
+++ b/lib/sqfs/data_reader.c
@@ -137,6 +137,51 @@ static void data_reader_destroy(sqfs_object_t *obj)
free(data);
}
+static sqfs_object_t *data_reader_copy(const sqfs_object_t *obj)
+{
+ const sqfs_data_reader_t *data = (const sqfs_data_reader_t *)obj;
+ sqfs_data_reader_t *copy;
+
+ copy = alloc_flex(sizeof(*data), 1, data->block_size);
+ if (copy == NULL)
+ return NULL;
+
+ memcpy(copy, data, sizeof(*data) + data->block_size);
+
+ copy->frag_tbl = sqfs_copy(data->frag_tbl);
+ if (copy->frag_tbl == NULL)
+ goto fail_ftbl;
+
+ if (data->data_block != NULL) {
+ copy->data_block = malloc(data->data_blk_size);
+ if (copy->data_block == NULL)
+ goto fail_dblk;
+
+ memcpy(copy->data_block, data->data_block,
+ data->data_blk_size);
+ }
+
+ if (copy->frag_block != NULL) {
+ copy->frag_block = malloc(copy->frag_blk_size);
+ if (copy->frag_block == NULL)
+ goto fail_fblk;
+
+ memcpy(copy->frag_block, data->frag_block,
+ data->frag_blk_size);
+ }
+
+ /* XXX: file and cmp aren't deep-copied becaues data
+ doesn't own them either. */
+ return (sqfs_object_t *)copy;
+fail_fblk:
+ free(copy->data_block);
+fail_dblk:
+ sqfs_destroy(copy->frag_tbl);
+fail_ftbl:
+ free(copy);
+ return NULL;
+}
+
sqfs_data_reader_t *sqfs_data_reader_create(sqfs_file_t *file,
size_t block_size,
sqfs_compressor_t *cmp)
@@ -153,6 +198,7 @@ sqfs_data_reader_t *sqfs_data_reader_create(sqfs_file_t *file,
}
((sqfs_object_t *)data)->destroy = data_reader_destroy;
+ ((sqfs_object_t *)data)->copy = data_reader_copy;
data->file = file;
data->block_size = block_size;
data->cmp = cmp;