diff options
Diffstat (limited to 'lib/sqfs/data_reader.c')
| -rw-r--r-- | lib/sqfs/data_reader.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/lib/sqfs/data_reader.c b/lib/sqfs/data_reader.c index 421d914..f8c80af 100644 --- a/lib/sqfs/data_reader.c +++ b/lib/sqfs/data_reader.c @@ -59,7 +59,8 @@ void data_reader_destroy(data_reader_t *data) free(data); } -int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd) +int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd, + bool allow_sparse) { size_t i, count, fragsz; bool compressed; @@ -82,6 +83,14 @@ int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd) if (bs > data->block_size) goto fail_bs; + if (bs == 0 && allow_sparse) { + if (ftruncate(outfd, i * data->block_size)) + goto fail_sparse; + if (lseek(outfd, 0, SEEK_END) == (off_t)-1) + goto fail_sparse; + continue; + } + if (bs == 0) { bs = data->block_size; memset(data->buffer, 0, bs); @@ -123,6 +132,12 @@ int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd) if (fragsz > 0) { if (fi->fragment == 0xFFFFFFFF || fi->fragment_offset == 0xFFFFFFFF) { + if (allow_sparse) { + if (ftruncate(outfd, fragsz)) + goto fail_sparse; + return 0; + } + memset(data->buffer, 0, fragsz); } else { if (data->frag == NULL) @@ -144,6 +159,9 @@ int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd) } return 0; +fail_sparse: + perror("creating sparse output file"); + return -1; fail_seek: perror("seek on squashfs"); return -1; |