static int cloop_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { BDRVCloopState *s = bs->opaque; uint32_t offsets_size, max_compressed_block_size = 1, i; int ret; bs->read_only = 1; /* read header */ ret = bdrv_pread(bs->file, 128, &s->block_size, 4); if (ret < 0) { return ret; s->block_size = be32_to_cpu(s->block_size); ret = bdrv_pread(bs->file, 128 + 4, &s->n_blocks, 4); if (ret < 0) { return ret; s->n_blocks = be32_to_cpu(s->n_blocks); /* read offsets */ offsets_size = s->n_blocks * sizeof(uint64_t); s->offsets = g_malloc(offsets_size); ret = bdrv_pread(bs->file, 128 + 4 + 4, s->offsets, offsets_size); if (ret < 0) { goto fail; for(i=0;i<s->n_blocks;i++) { s->offsets[i] = be64_to_cpu(s->offsets[i]); if (i > 0) { uint32_t size = s->offsets[i] - s->offsets[i - 1]; if (size > max_compressed_block_size) { max_compressed_block_size = size; /* initialize zlib engine */ s->compressed_block = g_malloc(max_compressed_block_size + 1); s->uncompressed_block = g_malloc(s->block_size); if (inflateInit(&s->zstream) != Z_OK) { ret = -EINVAL; goto fail; s->current_block = s->n_blocks; s->sectors_per_block = s->block_size/512; bs->total_sectors = s->n_blocks * s->sectors_per_block; qemu_co_mutex_init(&s->lock); return 0; fail: g_free(s->offsets); g_free(s->compressed_block); g_free(s->uncompressed_block); return ret;