diff options
Diffstat (limited to 'lib/sqfs/data_writer.c')
| -rw-r--r-- | lib/sqfs/data_writer.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/sqfs/data_writer.c b/lib/sqfs/data_writer.c index 753e5d4..70fe884 100644 --- a/lib/sqfs/data_writer.c +++ b/lib/sqfs/data_writer.c @@ -78,6 +78,11 @@ static int grow_fragment_table(data_writer_t *data) return 0; } +static bool is_zero_block(unsigned char *ptr, size_t size) +{ + return ptr[0] == 0 && memcmp(ptr, ptr + 1, size - 1) == 0; +} + int data_writer_flush_fragments(data_writer_t *data) { uint64_t offset; @@ -115,6 +120,7 @@ int write_data_from_fd(data_writer_t *data, file_info_t *fi, int infd) size_t diff; fi->startblock = data->super->bytes_used; + fi->sparse = 0; while (count != 0) { diff = count > (uint64_t)data->super->block_size ? @@ -126,6 +132,18 @@ int write_data_from_fd(data_writer_t *data, file_info_t *fi, int infd) if ((size_t)ret < diff) goto fail_trunc; + if (is_zero_block(data->block, diff)) { + if (diff < data->super->block_size) { + fi->fragment_offset = 0xFFFFFFFF; + fi->fragment = 0xFFFFFFFF; + } else { + fi->blocksizes[blk_idx++] = 0; + } + fi->sparse += diff; + count -= diff; + continue; + } + if (diff < data->super->block_size) { if (data->frag_offset + diff > data->super->block_size) { if (data_writer_flush_fragments(data)) |