/**************************************************************************** * NCSA HDF * * Software Development Group * * National Center for Supercomputing Applications * * University of Illinois at Urbana-Champaign * * 605 E. Springfield, Champaign IL 61820 * * * * For conditions of distribution and use, see the accompanying * * hdf/COPYING file. * * * ****************************************************************************/ #ifdef RCSID static char RcsId[] = "$Revision$"; #endif /* $Id$ */ #define H5A_PACKAGE /*suppress error about including H5Apkg */ /* Private header files */ #include /* Generic Functions */ #include /* IDs */ #include /* B-tree subclass names */ #include /* Datasets */ #include /* Groups */ #include /* Datatypes */ #include /* Error handling */ #include /* Memory management */ #include /* Property lists */ #include /* Object Headers */ #include /* Attributes */ #define PABLO_MASK H5A_mask /* Is the interface initialized? */ static hbool_t interface_initialize_g = FALSE; #define INTERFACE_INIT H5A_init_interface static herr_t H5A_init_interface(void); /* PRIVATE PROTOTYPES */ static void H5A_term_interface(void); static hid_t H5A_create(const H5G_entry_t *ent, const char *name, const H5T_t *type, const H5S_t *space); static hid_t H5A_open(H5G_entry_t *ent, unsigned idx); static herr_t H5A_write(H5A_t *attr, const H5T_t *mem_type, void *buf); static herr_t H5A_read(H5A_t *attr, const H5T_t *mem_type, void *buf); static int H5A_get_index(H5G_entry_t *ent, const char *name); /*-------------------------------------------------------------------------- NAME H5A_init_interface -- Initialize interface-specific information USAGE herr_t H5A_init_interface() RETURNS SUCCEED/FAIL DESCRIPTION Initializes any interface-specific data or routines. --------------------------------------------------------------------------*/ static herr_t H5A_init_interface(void) { herr_t ret_value = SUCCEED; FUNC_ENTER(H5A_init_interface, FAIL); /* * Register cleanup function. */ if ((ret_value = H5I_init_group(H5_ATTR, H5I_ATTRID_HASHSIZE, H5A_RESERVED_ATOMS, (herr_t (*)(void *)) H5A_close)) == FAIL) { HRETURN_ERROR(H5E_INTERNAL, H5E_CANTINIT, FAIL, "unable to initialize attribute group"); } if (H5_add_exit(H5A_term_interface) < 0) { HRETURN_ERROR(H5E_INTERNAL, H5E_CANTINIT, FAIL, "unable to install atexit function"); } FUNC_LEAVE(ret_value); } /*-------------------------------------------------------------------------- NAME H5A_term_interface PURPOSE Terminate various H5A objects USAGE void H5A_term_interface() RETURNS SUCCEED/FAIL DESCRIPTION Release any other resources allocated. GLOBAL VARIABLES COMMENTS, BUGS, ASSUMPTIONS Can't report errors... EXAMPLES REVISION LOG --------------------------------------------------------------------------*/ static void H5A_term_interface(void) { H5I_destroy_group(H5_ATTR); } /*-------------------------------------------------------------------------- NAME H5Acreate PURPOSE Creates a dataset as an attribute of another dataset or group USAGE hid_t H5Acreate (loc_id, name, type_id, space_id, plist_id) hid_t loc_id; IN: Object (dataset or group) to be attached to const char *name; IN: Name of attribute to create hid_t type_id; IN: ID of datatype for attribute hid_t space_id; IN: ID of dataspace for attribute hid_t plist_id; IN: ID of creation property list (currently not used) RETURNS SUCCEED/FAIL ERRORS DESCRIPTION This function creates an attribute which is attached to the object specified with 'location_id'. The name specified with 'name' for each attribute for an object must be unique for that object. The 'type_id' and 'space_id' are created with the H5T and H5S interfaces respectively. Currently only simple dataspaces are allowed for attribute dataspaces. The 'plist_id' property list is currently un-used, but will be used int the future for optional properties of attributes. The attribute ID returned from this function must be released with H5Aclose or resource leaks will develop. The link created (see H5G API documentation for more information on link types) is a hard link, so the attribute may be shared among datasets and will not be removed from the file until the reference count for the attribute is reduced to zero. The location object may be either a group or a dataset, both of which may have any sort of attribute. * * Modifications: * Robb Matzke, 5 Jun 1998 * The LOC_ID can also be a committed data type. * --------------------------------------------------------------------------*/ hid_t H5Acreate (hid_t loc_id, const char *name, hid_t type_id, hid_t space_id, hid_t plist_id) { void *obj = NULL; H5G_entry_t *ent = NULL; H5T_t *type = NULL; H5S_t *space = NULL; hid_t ret_value = FAIL; FUNC_ENTER(H5Acreate, FAIL); H5TRACE5("i","isiii",loc_id,name,type_id,space_id,plist_id); /* check arguments */ if (NULL==(obj=H5I_object (loc_id))) { HRETURN_ERROR (H5E_ARGS, H5E_BADATOM, FAIL, "illegal object atom"); } switch (H5I_group (loc_id)) { case H5_DATASET: ent = H5D_entof ((H5D_t*)obj); break; case H5_DATATYPE: if (NULL==(ent=H5T_entof ((H5T_t*)obj))) { HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "target data type is not committed"); } break; case H5_GROUP: ent = H5G_entof ((H5G_t*)obj); break; default: HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "inappropriate attribute target"); } if (!name || !*name) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name"); } if (H5_DATATYPE != H5I_group(type_id) || NULL == (type = H5I_object(type_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a type"); } if (H5_DATASPACE != H5I_group(space_id) || NULL == (space = H5I_object(space_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space"); } if (H5P_DEFAULT!=plist_id && (H5P_DATASET_CREATE != H5P_get_class(plist_id) || NULL == H5I_object(plist_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list"); } /* Go do the real work for attaching the attribute to the dataset */ if ((ret_value=H5A_create(ent,name,type,space))<0) { HRETURN_ERROR (H5E_ATTR, H5E_CANTINIT, FAIL, "unable to create attribute"); } FUNC_LEAVE(ret_value); } /* H5Acreate() */ /*------------------------------------------------------------------------- * Function: H5A_create * * Purpose: * This is the guts of the H5Acreate function. * Usage: * hid_t H5A_create (ent, name, type, space) * const H5G_entry_t *ent; IN: Pointer to symbol table entry for object to attribute * const char *name; IN: Name of attribute * H5T_t *type; IN: Datatype of attribute * H5S_t *space; IN: Dataspace of attribute * * Return: SUCCEED/FAIL * * Programmer: Quincey Koziol * April 2, 1998 * * Modifications: *------------------------------------------------------------------------- */ static hid_t H5A_create(const H5G_entry_t *ent, const char *name, const H5T_t *type, const H5S_t *space) { H5A_t *attr = NULL; H5A_t found_attr; intn seq=0; hid_t ret_value = FAIL; FUNC_ENTER(H5A_create, FAIL); /* check args */ assert(ent); assert(name); assert(type); assert(space); /* Build the attribute information */ if((attr = H5MM_calloc(sizeof(H5A_t)))==NULL) HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for attribute info"); attr->name=HDstrdup(name); attr->dt=H5T_copy(type, H5T_COPY_ALL); attr->ds=H5S_copy(space); attr->initialized = TRUE; /*for now, set to false later*/ /* Copy the symbol table entry */ attr->ent=*ent; /* Compute the internal sizes */ attr->dt_size=(H5O_DTYPE[0].raw_size)(attr->ent.file,type); attr->ds_size=(H5O_SDSPACE[0].raw_size)(attr->ent.file, &(space->extent.u.simple)); attr->data_size=H5S_extent_npoints(space)*H5T_get_size(type); /* Hold the symbol table entry (and file) open */ if (H5O_open(&(attr->ent)) < 0) { HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to open"); } attr->ent_opened=1; /* Read in the existing attributes to check for duplicates */ seq=0; while(H5O_read(&(attr->ent), H5O_ATTR, seq, &found_attr)!=NULL) { /* * Compare found attribute name to new attribute name reject creation * if names are the same. */ if(HDstrcmp(found_attr.name,attr->name)==0) { H5O_reset (H5O_ATTR, &found_attr); HGOTO_ERROR(H5E_ATTR, H5E_CANTCREATE, FAIL, "attribute already exists"); } H5O_reset (H5O_ATTR, &found_attr); seq++; } H5E_clear (); /* Create the attribute message and save the attribute index */ if (H5O_modify(&(attr->ent), H5O_ATTR, H5O_NEW_MESG, 0, attr) < 0) HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to update attribute header messages"); /* Register the new attribute and get an ID for it */ if ((ret_value = H5I_register(H5_ATTR, attr)) < 0) { HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register attribute for ID"); } /* Now it's safe to say it's uninitialized */ attr->initialized = FALSE; done: if (ret_value < 0) { if(attr) H5A_close(attr); } FUNC_LEAVE(ret_value); } /* H5A_create() */ /*-------------------------------------------------------------------------- NAME H5A_get_index PURPOSE Determine the index of an attribute in an object header USAGE int H5A_get_index (ent, name) H5G_entry_t *ent; IN: Symbol table entry of object const char *name; IN: Name of dataset to find RETURNS non-negative on success, negative on failure ERRORS DESCRIPTION This function determines the index of the attribute within an object header. This is not stored in the attribute structure because it is only a subjective measure and can change if attributes are deleted from the object header. --------------------------------------------------------------------------*/ static int H5A_get_index(H5G_entry_t *ent, const char *name) { H5A_t found_attr; int ret_value=FAIL, i; FUNC_ENTER(H5A_get_index, FAIL); assert(ent); assert(name); /* Look up the attribute for the object */ i=0; while(H5O_read(ent, H5O_ATTR, i, &found_attr)!=NULL) { /* * Compare found attribute name to new attribute name reject creation * if names are the same. */ if(HDstrcmp(found_attr.name,name)==0) { H5O_reset (H5O_ATTR, &found_attr); ret_value = i; break; } H5O_reset (H5O_ATTR, &found_attr); i++; } H5E_clear (); if(ret_value<0) { HRETURN_ERROR(H5E_ATTR, H5E_NOTFOUND, FAIL, "attribute not found"); } FUNC_LEAVE(ret_value); } /* H5A_get_index() */ /*-------------------------------------------------------------------------- NAME H5Aopen_name PURPOSE Opens an attribute for an object by looking up the attribute name USAGE hid_t H5Aopen_name (loc_id, name) hid_t loc_id; IN: Object (dataset or group) to be attached to const char *name; IN: Name of attribute to locate and open RETURNS ID of attribute on success, negative on failure ERRORS DESCRIPTION This function opens an existing attribute for access. The attribute name specified is used to look up the corresponding attribute for the object. The attribute ID returned from this function must be released with H5Aclose or resource leaks will develop. The location object may be either a group or a dataset, both of which may have any sort of attribute. * * Modifications: * Robb Matzke, 5 Jun 1998 * The LOC_ID can also be a named (committed) data type. --------------------------------------------------------------------------*/ hid_t H5Aopen_name (hid_t loc_id, const char *name) { H5G_entry_t *ent = NULL; /*Symtab entry of object to attribute*/ void *obj = NULL; intn idx=0; hid_t ret_value = FAIL; FUNC_ENTER(H5Aopen_name, FAIL); H5TRACE2("i","is",loc_id,name); /* check arguments */ if(NULL == (obj = H5I_object(loc_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADATOM, FAIL, "illegal object atom"); } switch (H5I_group (loc_id)) { case H5_DATASET: ent = H5D_entof ((H5D_t*)obj); break; case H5_DATATYPE: if (NULL==(ent=H5T_entof ((H5T_t*)obj))) { HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "target data type is not committed"); } break; case H5_GROUP: ent = H5G_entof ((H5G_t*)obj); break; default: HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "inappropriate attribute target"); } if (!name || !*name) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name"); } /* Look up the attribute for the object */ if((idx=H5A_get_index(ent,name))<0) HRETURN_ERROR(H5E_ATTR, H5E_BADVALUE, FAIL, "attribute not found"); /* Go do the real work for opening the attribute */ if ((ret_value=H5A_open(ent, (unsigned)idx))<0) { HRETURN_ERROR (H5E_ATTR, H5E_CANTINIT, FAIL, "unable to open attribute"); } FUNC_LEAVE(ret_value); } /* H5Aopen_name() */ /*-------------------------------------------------------------------------- NAME H5Aopen_idx PURPOSE Opens the n'th attribute for an object USAGE hid_t H5Aopen_idx (loc_id, idx) hid_t loc_id; IN: Object (dataset or group) to be attached to unsigned idx; IN: Index (0-based) attribute to open RETURNS ID of attribute on success, negative on failure ERRORS DESCRIPTION This function opens an existing attribute for access. The attribute index specified is used to look up the corresponding attribute for the object. The attribute ID returned from this function must be released with H5Aclose or resource leaks will develop. The location object may be either a group or a dataset, both of which may have any sort of attribute. * * Modifications: * Robb Matzke, 5 Jun 1998 * The LOC_ID can also be a named (committed) data type. * --------------------------------------------------------------------------*/ hid_t H5Aopen_idx (hid_t loc_id, unsigned idx) { H5G_entry_t *ent = NULL; /*Symtab entry of object to attribute */ void *obj = NULL; hid_t ret_value = FAIL; FUNC_ENTER(H5Aopen_idx, FAIL); H5TRACE2("i","iIu",loc_id,idx); /* check arguments */ if(NULL == (obj = H5I_object(loc_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADATOM, FAIL, "illegal object atom"); } switch (H5I_group (loc_id)) { case H5_DATASET: ent = H5D_entof ((H5D_t*)obj); break; case H5_DATATYPE: if (NULL==(ent=H5T_entof ((H5T_t*)obj))) { HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "target data type is not committed"); } break; case H5_GROUP: ent = H5G_entof ((H5G_t*)obj); break; default: HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "inappropriate attribute target"); } /* Go do the real work for opening the attribute */ if ((ret_value=H5A_open(ent, idx))<0) { HRETURN_ERROR (H5E_ATTR, H5E_CANTINIT, FAIL, "unable to open attribute"); } FUNC_LEAVE(ret_value); } /* H5Aopen_idx() */ /*------------------------------------------------------------------------- * Function: H5A_open * * Purpose: * This is the guts of the H5Aopen_xxx functions * Usage: * herr_t H5A_open (ent, idx) * const H5G_entry_t *ent; IN: Pointer to symbol table entry for object to attribute * unsigned idx; IN: index of attribute to open (0-based) * * Return: SUCCEED/FAIL * * Programmer: Quincey Koziol * April 2, 1998 * * Modifications: * *------------------------------------------------------------------------- */ static hid_t H5A_open(H5G_entry_t *ent, unsigned idx) { H5A_t *attr = NULL; hid_t ret_value = FAIL; FUNC_ENTER(H5A_open, FAIL); /* check args */ assert(ent); /* Read in attribute with H5O_read() */ if (NULL==(attr=H5O_read(ent, H5O_ATTR, idx, attr))) { HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to load attribute info from dataset header"); } /* Copy the symbol table entry */ attr->ent=*ent; /* Hold the symbol table entry (and file) open */ if (H5O_open(&(attr->ent)) < 0) { HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to open"); } attr->ent_opened=1; /* Register the new attribute and get an ID for it */ if ((ret_value = H5I_register(H5_ATTR, attr)) < 0) { HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register attribute for ID"); } done: if (ret_value < 0) { if(attr) H5A_close(attr); } FUNC_LEAVE(ret_value); } /* H5A_open() */ /*-------------------------------------------------------------------------- NAME H5Awrite PURPOSE Write out data to an attribute USAGE herr_t H5Awrite (attr_id, type_id, buf) hid_t attr_id; IN: Attribute to write hid_t type_id; IN: Memory datatype of buffer void *buf; IN: Buffer of data to write RETURNS SUCCEED/FAIL ERRORS DESCRIPTION This function writes a complete attribute to disk. --------------------------------------------------------------------------*/ herr_t H5Awrite (hid_t attr_id, hid_t type_id, void *buf) { H5A_t *attr = NULL; const H5T_t *mem_type = NULL; herr_t ret_value = FAIL; FUNC_ENTER(H5Awrite, FAIL); H5TRACE3("e","iix",attr_id,type_id,buf); /* check arguments */ if (H5_ATTR != H5I_group(attr_id) || (NULL == (attr = H5I_object(attr_id)))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute"); } if (H5_DATATYPE != H5I_group(type_id) || NULL == (mem_type = H5I_object(type_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type"); } if (NULL == buf) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "null attribute buffer"); } /* Go write the actual data to the attribute */ if ((ret_value=H5A_write(attr,mem_type,buf))<0) { HRETURN_ERROR(H5E_ATTR, H5E_WRITEERROR, FAIL, "unable to write attribute"); } FUNC_LEAVE(ret_value); } /* H5Awrite() */ /*-------------------------------------------------------------------------- NAME H5A_write PURPOSE Actually write out data to an attribute USAGE herr_t H5A_write (attr, mem_type, buf) H5A_t *attr; IN: Attribute to write const H5T_t *mem_type; IN: Memory datatype of buffer void *buf; IN: Buffer of data to write RETURNS SUCCEED/FAIL ERRORS DESCRIPTION This function writes a complete attribute to disk. --------------------------------------------------------------------------*/ static herr_t H5A_write(H5A_t *attr, const H5T_t *mem_type, void *buf) { uint8 *tconv_buf = NULL; /* data type conv buffer */ size_t nelmts; /* elements in attribute */ H5T_conv_t tconv_func = NULL; /* conversion function */ H5T_cdata_t *cdata = NULL; /* type conversion data */ hid_t src_id = -1, dst_id = -1;/* temporary type atoms */ size_t src_type_size; /* size of source type */ size_t dst_type_size; /* size of destination type*/ size_t buf_size; /* desired buffer size */ int idx; /* index of attribute in object header */ herr_t ret_value = FAIL; #ifdef H5T_DEBUG H5_timer_t timer; #endif FUNC_ENTER(H5A_write, FAIL); assert(attr); assert(mem_type); assert(buf); /* Create buffer for data to store on disk */ nelmts=H5S_extent_npoints (attr->ds); /* Get the memory and file datatype sizes */ src_type_size = H5T_get_size(mem_type); dst_type_size = H5T_get_size(attr->dt); /* Get the maximum buffer size needed and allocate it */ buf_size = nelmts*MAX(src_type_size,dst_type_size); if (NULL==(tconv_buf = H5MM_malloc (buf_size))) { HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed"); } /* Copy the user's data into the buffer for conversion */ HDmemcpy(tconv_buf,buf,src_type_size*nelmts); /* Convert memory buffer into disk buffer */ /* Set up type conversion function */ if (NULL == (tconv_func = H5T_find(mem_type, attr->dt, H5T_BKG_NO, &cdata))) { HGOTO_ERROR(H5E_ATTR, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dest data types"); } else if (H5T_conv_noop!=tconv_func) { if ((src_id = H5I_register(H5_DATATYPE, H5T_copy(mem_type, H5T_COPY_ALL)))<0 || (dst_id = H5I_register(H5_DATATYPE, H5T_copy(attr->dt, H5T_COPY_ALL)))<0) { HGOTO_ERROR(H5E_ATTR, H5E_CANTREGISTER, FAIL, "unable to register types for conversion"); } } /* Perform data type conversion. */ #ifdef H5T_DEBUG H5T_timer_begin (&timer, cdata); #endif cdata->command = H5T_CONV_CONV; if ((tconv_func) (src_id, dst_id, cdata, nelmts, tconv_buf, NULL)<0) { HGOTO_ERROR(H5E_ATTR, H5E_CANTENCODE, FAIL, "data type conversion failed"); } #ifdef H5T_DEBUG H5T_timer_end (&timer, cdata, nelmts); #endif /* Free the previous attribute data buffer, if there is one */ if(attr->data) H5MM_xfree(attr->data); /* Look up the attribute for the object */ if((idx=H5A_get_index(&(attr->ent),attr->name))<0) HGOTO_ERROR(H5E_ATTR, H5E_BADVALUE, FAIL, "attribute not found"); /* Modify the attribute data */ attr->data=tconv_buf; /* Set the data pointer temporarily */ if (H5O_modify(&(attr->ent), H5O_ATTR, idx, 0, attr) < 0) HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to update attribute header messages"); attr->data=NULL; /* un-do the data pointer */ /* Indicate the the attribute doesn't need fill-values */ attr->initialized=TRUE; ret_value=SUCCEED; done: /* Release resources */ if (src_id >= 0) H5I_dec_ref(src_id); if (dst_id >= 0) H5I_dec_ref(dst_id); if (tconv_buf) H5MM_xfree(tconv_buf); FUNC_LEAVE(ret_value); } /* H5A_write() */ /*-------------------------------------------------------------------------- NAME H5Aread PURPOSE Read in data from an attribute USAGE herr_t H5Aread (attr_id, type_id, buf) hid_t attr_id; IN: Attribute to read hid_t type_id; IN: Memory datatype of buffer void *buf; IN: Buffer for data to read RETURNS SUCCEED/FAIL ERRORS DESCRIPTION This function reads a complete attribute from disk. --------------------------------------------------------------------------*/ herr_t H5Aread (hid_t attr_id, hid_t type_id, void *buf) { H5A_t *attr = NULL; const H5T_t *mem_type = NULL; herr_t ret_value = FAIL; FUNC_ENTER(H5Aread, FAIL); H5TRACE3("e","iix",attr_id,type_id,buf); /* check arguments */ if (H5_ATTR != H5I_group(attr_id) || (NULL == (attr = H5I_object(attr_id)))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute"); } if (H5_DATATYPE != H5I_group(type_id) || NULL == (mem_type = H5I_object(type_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type"); } if (NULL == buf) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "null attribute buffer"); } /* Go write the actual data to the attribute */ if ((ret_value=H5A_read(attr,mem_type,buf))<0) { HRETURN_ERROR(H5E_ATTR, H5E_READERROR, FAIL, "unable to read attribute"); } FUNC_LEAVE(ret_value); } /* H5Aread() */ /*-------------------------------------------------------------------------- NAME H5A_read PURPOSE Actually read in data from an attribute USAGE herr_t H5A_read (attr, mem_type, buf) H5A_t *attr; IN: Attribute to read const H5T_t *mem_type; IN: Memory datatype of buffer void *buf; IN: Buffer for data to read RETURNS SUCCEED/FAIL ERRORS DESCRIPTION This function read a complete attribute to disk. --------------------------------------------------------------------------*/ static herr_t H5A_read(H5A_t *attr, const H5T_t *mem_type, void *buf) { uint8 *tconv_buf = NULL; /* data type conv buffer*/ size_t nelmts; /* elements in attribute*/ H5T_conv_t tconv_func = NULL; /* conversion function */ H5T_cdata_t *cdata = NULL; /* type conversion data */ hid_t src_id = -1, dst_id = -1;/* temporary type atoms*/ size_t src_type_size; /* size of source type */ size_t dst_type_size; /* size of destination type */ size_t buf_size; /* desired buffer size */ herr_t ret_value = FAIL; #ifdef H5T_DEBUG H5_timer_t timer; #endif FUNC_ENTER(H5A_read, FAIL); assert(attr); assert(mem_type); assert(buf); /* Create buffer for data to store on disk */ nelmts=H5S_extent_npoints (attr->ds); /* Get the memory and file datatype sizes */ src_type_size = H5T_get_size(attr->dt); dst_type_size = H5T_get_size(mem_type); /* Get the maximum buffer size needed and allocate it */ buf_size = nelmts*MAX(src_type_size,dst_type_size); if (NULL==(tconv_buf = H5MM_malloc (buf_size))) { HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed"); } /* Copy the attribute data into the buffer for conversion */ HDmemcpy(tconv_buf,attr->data,src_type_size*nelmts); /* Convert memory buffer into disk buffer */ /* Set up type conversion function */ if (NULL == (tconv_func = H5T_find(attr->dt, mem_type, H5T_BKG_NO, &cdata))) { HGOTO_ERROR(H5E_ATTR, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dest data types"); } else if (H5T_conv_noop!=tconv_func) { if ((src_id = H5I_register(H5_DATATYPE, H5T_copy(attr->dt, H5T_COPY_ALL)))<0 || (dst_id = H5I_register(H5_DATATYPE, H5T_copy(mem_type, H5T_COPY_ALL)))<0) { HGOTO_ERROR(H5E_ATTR, H5E_CANTREGISTER, FAIL, "unable to register types for conversion"); } } /* Perform data type conversion. */ #ifdef H5T_DEBUG H5T_timer_begin (&timer, cdata); #endif cdata->command = H5T_CONV_CONV; if ((tconv_func) (src_id, dst_id, cdata, nelmts, tconv_buf, NULL)<0) { HGOTO_ERROR(H5E_ATTR, H5E_CANTENCODE, FAIL, "data type conversion failed"); } #ifdef H5T_DEBUG H5T_timer_end (&timer, cdata, nelmts); #endif /* Copy the converted data into the user's buffer */ HDmemcpy(buf,tconv_buf,dst_type_size*nelmts); ret_value=SUCCEED; done: /* Release resources */ if (src_id >= 0) H5I_dec_ref(src_id); if (dst_id >= 0) H5I_dec_ref(dst_id); if (tconv_buf) H5MM_xfree(tconv_buf); FUNC_LEAVE(ret_value); } /* H5A_read() */ /*-------------------------------------------------------------------------- NAME H5Aget_space PURPOSE Gets a copy of the dataspace for an attribute USAGE hid_t H5Aget_space (attr_id) hid_t attr_id; IN: Attribute to get dataspace of RETURNS A dataspace ID on success, negative on failure ERRORS DESCRIPTION This function retrieves a copy of the dataspace for an attribute. The dataspace ID returned from this function must be released with H5Sclose or resource leaks will develop. --------------------------------------------------------------------------*/ hid_t H5Aget_space (hid_t attr_id) { H5A_t *attr = NULL; H5S_t *dst = NULL; hid_t ret_value = FAIL; FUNC_ENTER(H5Aget_space, FAIL); H5TRACE1("i","i",attr_id); /* check arguments */ if (H5_ATTR != H5I_group(attr_id) || (NULL == (attr = H5I_object(attr_id)))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute"); } /* Copy the attribute's dataspace */ if (NULL==(dst=H5S_copy (attr->ds))) { HRETURN_ERROR (H5E_ATTR, H5E_CANTINIT, FAIL, "unable to copy dataspace"); } /* Atomize */ if ((ret_value=H5I_register (H5_DATASPACE, dst))<0) { HRETURN_ERROR (H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register dataspace atom"); } FUNC_LEAVE(ret_value); } /* H5Aget_space() */ /*-------------------------------------------------------------------------- NAME H5Aget_type PURPOSE Gets a copy of the datatype for an attribute USAGE hid_t H5Aget_type (attr_id) hid_t attr_id; IN: Attribute to get datatype of RETURNS A datatype ID on success, negative on failure ERRORS DESCRIPTION This function retrieves a copy of the datatype for an attribute. The datatype ID returned from this function must be released with H5Tclose or resource leaks will develop. * * Modifications: * Robb Matzke, 4 Jun 1998 * The data type is reopened if it's a named type before returning it to * the application. The data types returned by this function are always * read-only. If an error occurs when atomizing the return data type * then the data type is closed. --------------------------------------------------------------------------*/ hid_t H5Aget_type (hid_t attr_id) { H5A_t *attr = NULL; H5T_t *dst = NULL; hid_t ret_value = FAIL; FUNC_ENTER(H5Aget_type, FAIL); H5TRACE1("i","i",attr_id); /* check arguments */ if (H5_ATTR != H5I_group(attr_id) || (NULL == (attr = H5I_object(attr_id)))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute"); } /* * Copy the attribute's data type. If the type is a named type then * reopen the type before returning it to the user. Make the type * read-only. */ if (NULL==(dst=H5T_copy (attr->dt, H5T_COPY_REOPEN))) { HRETURN_ERROR (H5E_ATTR, H5E_CANTINIT, FAIL, "unable to copy datatype"); } if (H5T_lock (dst, FALSE)<0) { H5T_close (dst); HRETURN_ERROR (H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to lock transient data type"); } /* Atomize */ if ((ret_value=H5I_register (H5_DATATYPE, dst))<0) { H5T_close (dst); HRETURN_ERROR (H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register datatype atom"); } FUNC_LEAVE(ret_value); } /* H5Aget_type() */ /*-------------------------------------------------------------------------- NAME H5Aget_name PURPOSE Gets a copy of the name for an attribute USAGE size_t H5Aget_name (attr_id, buf, buf_size) hid_t attr_id; IN: Attribute to get name of char *buf; IN: Buffer to store name in size_t buf_size; IN: The size of the buffer to store the string in. RETURNS This function returns the length of the attribute's name (which may be longer than 'buf_size') on success or negative for failure. ERRORS DESCRIPTION This function retrieves the name of an attribute for an attribute ID. Up to 'buf_size' characters are stored in 'buf' followed by a '\0' string terminator. If the name of the attribute is longer than 'buf_size'-1, the string terminator is stored in the last position of the buffer to properly terminate the string. --------------------------------------------------------------------------*/ size_t H5Aget_name (hid_t attr_id, char *buf, size_t buf_size) { H5A_t *attr = NULL; size_t copy_len=0; size_t ret_value = FAIL; FUNC_ENTER(H5Aget_name, FAIL); H5TRACE3("z","isz",attr_id,buf,buf_size); /* check arguments */ if (H5_ATTR != H5I_group(attr_id) || (NULL == (attr = H5I_object(attr_id)))) { HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute"); } if (!buf || buf_size==0) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid buffer"); } /* get the real attribute length */ ret_value=HDstrlen(attr->name); /* compute the string length which will fit into the user's buffer */ copy_len=MIN(buf_size-1,ret_value); /* Copy all/some of the name */ HDmemcpy(buf,attr->name,copy_len); /* Terminate the string */ buf[copy_len]='\0'; FUNC_LEAVE(ret_value); } /* H5Aget_type() */ /*-------------------------------------------------------------------------- NAME H5Anum_attrs PURPOSE Determines the number of attributes attached to an object USAGE int H5Anum_attrs (loc_id) hid_t loc_id; IN: Object (dataset or group) to be queried RETURNS Number of attributes on success, negative on failure ERRORS DESCRIPTION This function returns the number of attributes attached to a dataset or group, 'location_id'. * * Modifications: * Robb Matzke, 5 Jun 1998 * The LOC_ID can also be a named (committed) data type. --------------------------------------------------------------------------*/ int H5Anum_attrs (hid_t loc_id) { H5G_entry_t *ent = NULL; /*symtab ent of object to attribute */ void *obj = NULL; int ret_value = 0; FUNC_ENTER(H5Anum_attrs, FAIL); H5TRACE1("Is","i",loc_id); /* check arguments */ if(NULL == (obj = H5I_object(loc_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADATOM, FAIL, "illegal object atom"); } switch (H5I_group (loc_id)) { case H5_DATASET: ent = H5D_entof ((H5D_t*)obj); break; case H5_DATATYPE: if (NULL==(ent=H5T_entof ((H5T_t*)obj))) { HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "target data type is not committed"); } break; case H5_GROUP: ent = H5G_entof ((H5G_t*)obj); break; default: HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "inappropriate attribute target"); } /* Look up the attribute for the object */ ret_value=H5O_count(ent, H5O_ATTR); FUNC_LEAVE(ret_value); } /* H5Anum_attrs() */ /*-------------------------------------------------------------------------- NAME H5Aiterate PURPOSE Calls a user's function for each attribute on an object USAGE herr_t H5Aiterate (loc_id, attr_num, op, data) hid_t loc_id; IN: Object (dataset or group) to be iterated over unsigned *attr_num; IN/OUT: Starting (IN) & Ending (OUT) attribute number H5A_operator_t op; IN: User's function to pass each attribute to void *op_data; IN/OUT: User's data to pass through to iterator operator function RETURNS Returns a negative value if something is wrong, the return value of the last operator if it was non-zero, or zero if all attributes were processed. ERRORS DESCRIPTION This function interates over the attributes of dataset or group specified with 'loc_id'. For each attribute of the object, the 'op_data' and some additional information (specified below) are passed to the 'op' function. The iteration begins with the '*attr_number' object in the group and the next attribute to be processed by the operator is returned in '*attr_number'. The operation receives the ID for the group or dataset being iterated over ('loc_id'), the name of the current attribute about the object ('attr_name') and the pointer to the operator data passed in to H5Aiterate ('op_data'). The return values from an operator are: A. Zero causes the iterator to continue, returning zero when all attributes have been processed. B. Positive causes the iterator to immediately return that positive value, indicating short-circuit success. The iterator can be restarted at the next attribute. C. Negative causes the iterator to immediately return that value, indicating failure. The iterator can be restarted at the next attribute. * * Modifications: * Robb Matzke, 5 Jun 1998 * The LOC_ID can also be a named (committed) data type. * * Robb Matzke, 5 Jun 1998 * Like the group iterator, if ATTR_NUM is the null pointer then all * attributes are processed. * --------------------------------------------------------------------------*/ int H5Aiterate (hid_t loc_id, unsigned *attr_num, H5A_operator_t op, void *op_data) { H5G_entry_t *ent = NULL; /*symtab ent of object to attribute */ void *obj = NULL; H5A_t found_attr; intn ret_value = 0; intn idx; FUNC_ENTER(H5Aiterate, FAIL); H5TRACE4("Is","i*Iuxx",loc_id,attr_num,op,op_data); /* check arguments */ if(NULL == (obj = H5I_object(loc_id))) { HRETURN_ERROR(H5E_ARGS, H5E_BADATOM, FAIL, "illegal object atom"); } switch (H5I_group (loc_id)) { case H5_DATASET: ent = H5D_entof ((H5D_t*)obj); break; case H5_DATATYPE: if (NULL==(ent=H5T_entof ((H5T_t*)obj))) { HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "target data type is not committed"); } break; case H5_GROUP: ent = H5G_entof ((H5G_t*)obj); break; default: HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "inappropriate attribute target"); } if (!op) { HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid operator"); } /* * Look up the attribute for the object. Make certain the start point is * reasonable. */ idx = attr_num ? (intn)*attr_num : 0; if(idxent_opened=0; /* Copy the guts of the attribute */ new_attr->name=HDstrdup(old_attr->name); new_attr->dt=H5T_copy(old_attr->dt, H5T_COPY_ALL); new_attr->ds=H5S_copy(old_attr->ds); if(old_attr->data) { if (NULL==(new_attr->data=H5MM_malloc(old_attr->data_size))) { HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed"); } HDmemcpy(new_attr->data,old_attr->data,old_attr->data_size); } /* end if */ #ifndef LATER /* Copy the share info? */ #endif FUNC_LEAVE(new_attr); } /*------------------------------------------------------------------------- * Function: H5A_close * * Purpose: Frees a attribute and all associated memory. * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: Robb Matzke * Monday, December 8, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5A_close(H5A_t *attr) { FUNC_ENTER(H5A_close, FAIL); assert(attr); /* Check if the attribute has any data yet, if not, fill with zeroes */ if(attr->ent_opened && !attr->initialized) { uint8 *tmp_buf=H5MM_calloc(attr->data_size); if (NULL == tmp_buf) { HRETURN_ERROR(H5E_ATTR, H5E_NOSPACE, FAIL, "memory allocation failed for attribute fill-value"); } /* Go write the fill data to the attribute */ if (H5A_write(attr,attr->dt,tmp_buf)<0) { HRETURN_ERROR(H5E_ATTR, H5E_WRITEERROR, FAIL, "unable to write attribute"); } /* Free temporary buffer */ H5MM_xfree(tmp_buf); } /* end if */ /* Free dynamicly allocated items */ if(attr->name) H5MM_xfree(attr->name); if(attr->dt) H5T_close(attr->dt); if(attr->ds) H5S_close(attr->ds); if(attr->data) H5MM_xfree(attr->data); /* Close the object's symbol-table entry */ if(attr->ent_opened) H5O_close(&(attr->ent)); #ifndef LATER /* Do something with the shared information? */ #endif H5MM_xfree(attr); FUNC_LEAVE(SUCCEED); }