diff options
Diffstat (limited to 'src/H5O.c')
| -rw-r--r-- | src/H5O.c | 26 |
1 files changed, 26 insertions, 0 deletions
@@ -677,6 +677,8 @@ H5O_create(H5F_t *f, hid_t dxpl_id, size_t size_hint, hid_t ocpl_id, /* Initialize version-specific fields */ if(oh->version > H5O_VERSION_1) { + size_t tent_oh_size; /* Tentative size of object header */ + /* Initialize all time fields with current time, if we are storing them */ if(oh->flags & H5O_HDR_STORE_TIMES) oh->atime = oh->mtime = oh->ctime = oh->btime = H5_now(); @@ -698,6 +700,30 @@ H5O_create(H5F_t *f, hid_t dxpl_id, size_t size_hint, hid_t ocpl_id, /* Check for non-default attribute storage phase change values */ if(oh->max_compact != H5O_CRT_ATTR_MAX_COMPACT_DEF || oh->min_dense != H5O_CRT_ATTR_MIN_DENSE_DEF) oh->flags |= H5O_HDR_ATTR_STORE_PHASE_CHANGE; + + /* Determine correct value for chunk #0 size bits */ + + /* See if only 1 byte is enough */ + tent_oh_size = H5O_SIZEOF_HDR(oh) + size_hint; + if(tent_oh_size > 255) { + uint8_t old_oh_flags = oh->flags; /* Temporary object header flags */ + + /* Need more than 1 byte, see if 2 bytes is enough */ + oh->flags |= H5O_HDR_CHUNK0_2; + tent_oh_size = H5O_SIZEOF_HDR(oh) + size_hint; + if(tent_oh_size > 65535) { + /* Need more than 2 bytes, see if 4 bytes is enough */ + oh->flags = old_oh_flags; + oh->flags |= H5O_HDR_CHUNK0_4; + tent_oh_size = H5O_SIZEOF_HDR(oh) + size_hint; + if(tent_oh_size > 4294967295) { + /* Use 8 bytes */ + /* (Should probably have check for using more than 8 bytes... :-) */ + oh->flags = old_oh_flags; + oh->flags |= H5O_HDR_CHUNK0_8; + } /* end if */ + } /* end if */ + } /* end if */ } /* end if */ else { /* Reset unused time fields */ |