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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/****************/
/* Module Setup */
/****************/
#define H5G_FRIEND /*suppress error about including H5Gpkg */
#include "H5Lmodule.h" /* This source code file is part of the H5L module */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Fprivate.h" /* Files */
#include "H5Gpkg.h" /* Groups */
#include "H5Iprivate.h" /* IDs */
#include "H5Lpkg.h" /* Links */
#include "H5MMprivate.h" /* Memory management */
#include "H5Opublic.h" /* File objects */
#include "H5Pprivate.h" /* Property lists */
#include "H5VLprivate.h" /* Virtual Object Layer */
/****************/
/* Local Macros */
/****************/
/* Size of local link name buffer for traversing external links */
#define H5L_EXT_TRAVERSE_BUF_SIZE 256
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Local Prototypes */
/********************/
static hid_t H5L__extern_traverse(const char *link_name, hid_t cur_group, const void *udata,
size_t udata_size, hid_t lapl_id, hid_t dxpl_id);
static ssize_t H5L__extern_query(const char *link_name, const void *udata, size_t udata_size,
void *buf /*out*/, size_t buf_size);
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/* Default External Link link class */
static const H5L_class_t H5L_EXTERN_LINK_CLASS[1] = {{
H5L_LINK_CLASS_T_VERS, /* H5L_class_t version */
H5L_TYPE_EXTERNAL, /* Link type id number */
"external", /* Link name for debugging */
NULL, /* Creation callback */
NULL, /* Move callback */
NULL, /* Copy callback */
H5L__extern_traverse, /* The actual traversal function */
NULL, /* Deletion callback */
H5L__extern_query /* Query callback */
}};
/*-------------------------------------------------------------------------
* Function: H5L__extern_traverse
*
* Purpose: Default traversal function for external links. This can
* be overridden using H5Lregister().
*
* Given a filename and path packed into the link udata,
* attempts to open an object within an external file.
* If the H5L_ELINK_PREFIX_NAME property is set in the
* link access property list, appends that prefix to the
* filename being opened.
*
* Return: ID of the opened object on success/H5I_INVALID_HID on failure
*
*-------------------------------------------------------------------------
*/
static hid_t
H5L__extern_traverse(const char H5_ATTR_UNUSED *link_name, hid_t cur_group, const void *_udata,
size_t H5_ATTR_UNUSED udata_size, hid_t lapl_id, hid_t H5_ATTR_UNUSED dxpl_id)
{
H5P_genplist_t *plist; /* Property list pointer */
H5G_loc_t root_loc; /* Location of root group in external file */
H5G_loc_t loc; /* Location of object */
H5F_t *ext_file = NULL; /* File struct for external file */
const uint8_t *p = (const uint8_t *)_udata; /* Pointer into external link buffer */
const char *file_name; /* Name of file containing external link's object */
const char *obj_name; /* Name external link's object */
size_t fname_len; /* Length of external link file name */
unsigned intent; /* File access permissions */
H5L_elink_cb_t cb_info; /* Callback info struct */
hid_t fapl_id = H5I_INVALID_HID; /* File access property list for external link's file */
void *ext_obj = NULL; /* External link's object */
hid_t ext_obj_id = H5I_INVALID_HID; /* ID for external link's object */
H5I_type_t opened_type; /* ID type of external link's object */
char *parent_group_name = NULL; /* Temporary pointer to group name */
char local_group_name[H5L_EXT_TRAVERSE_BUF_SIZE]; /* Local buffer to hold group name */
H5P_genplist_t *fa_plist; /* File access property list pointer */
H5F_close_degree_t fc_degree = H5F_CLOSE_WEAK; /* File close degree for target file */
char *elink_prefix = NULL; /* Pointer to elink prefix */
hid_t ret_value = H5I_INVALID_HID; /* Return value */
FUNC_ENTER_PACKAGE
/* Sanity checks */
assert(p);
/* Check external link version & flags */
if (((*p >> 4) & 0x0F) > H5L_EXT_VERSION)
HGOTO_ERROR(H5E_LINK, H5E_CANTDECODE, H5I_INVALID_HID, "bad version number for external link");
if ((*p & 0x0F) & ~H5L_EXT_FLAGS_ALL)
HGOTO_ERROR(H5E_LINK, H5E_CANTDECODE, H5I_INVALID_HID, "bad flags for external link");
p++;
/* Gather some information from the external link's user data */
file_name = (const char *)p;
fname_len = strlen(file_name);
obj_name = (const char *)p + fname_len + 1;
/* Get the plist structure */
if (NULL == (plist = H5P_object_verify(lapl_id, H5P_LINK_ACCESS)))
HGOTO_ERROR(H5E_ID, H5E_BADID, H5I_INVALID_HID, "can't find object for ID");
/* Get the fapl_id set for lapl_id if any */
if (H5P_get(plist, H5L_ACS_ELINK_FAPL_NAME, &fapl_id) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, H5I_INVALID_HID, "can't get fapl for links");
/* Get the location for the group holding the external link */
if (H5G_loc(cur_group, &loc) < 0)
HGOTO_ERROR(H5E_LINK, H5E_CANTGET, H5I_INVALID_HID, "can't get object location");
/* get the access flags set for lapl_id if any */
if (H5P_get(plist, H5L_ACS_ELINK_FLAGS_NAME, &intent) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, H5I_INVALID_HID, "can't get elink file access flags");
/* get the file access mode flags for the parent file, if they were not set
* on lapl_id */
if (intent == H5F_ACC_DEFAULT)
intent = H5F_INTENT(loc.oloc->file);
if ((fapl_id == H5P_DEFAULT) && ((fapl_id = H5F_get_access_plist(loc.oloc->file, false)) < 0))
HGOTO_ERROR(H5E_LINK, H5E_CANTGET, H5I_INVALID_HID, "can't get parent's file access property list");
/* Get callback_info */
if (H5P_get(plist, H5L_ACS_ELINK_CB_NAME, &cb_info) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, H5I_INVALID_HID, "can't get elink callback info");
/* Get file access property list */
if (NULL == (fa_plist = H5P_object_verify(fapl_id, H5P_FILE_ACCESS)))
HGOTO_ERROR(H5E_ID, H5E_BADID, H5I_INVALID_HID, "can't find object for ID");
/* Make callback if it exists */
if (cb_info.func) {
const char *parent_file_name; /* Parent file name */
size_t group_name_len = 0; /* Length of parent group name */
/* Get parent file name */
parent_file_name = H5F_OPEN_NAME(loc.oloc->file);
/* Query length of parent group name */
if (H5G_get_name(&loc, NULL, (size_t)0, &group_name_len, NULL) < 0)
HGOTO_ERROR(H5E_LINK, H5E_CANTGET, H5I_INVALID_HID, "unable to retrieve length of group name");
/* Account for null terminator */
group_name_len++;
/* Check if we need to allocate larger buffer */
if (group_name_len > sizeof(local_group_name)) {
if (NULL == (parent_group_name = (char *)H5MM_malloc(group_name_len)))
HGOTO_ERROR(H5E_LINK, H5E_CANTALLOC, H5I_INVALID_HID,
"can't allocate buffer to hold group name, group_name_len = %zu", group_name_len);
} /* end if */
else
parent_group_name = local_group_name;
/* Get parent group name */
if (H5G_get_name(&loc, parent_group_name, group_name_len, NULL, NULL) < 0)
HGOTO_ERROR(H5E_LINK, H5E_CANTGET, H5I_INVALID_HID, "unable to retrieve group name");
/* Make callback */
if ((cb_info.func)(parent_file_name, parent_group_name, file_name, obj_name, &intent, fapl_id,
cb_info.user_data) < 0)
HGOTO_ERROR(H5E_LINK, H5E_CALLBACK, H5I_INVALID_HID, "traversal operator failed");
/* Check access flags */
if ((intent & H5F_ACC_TRUNC) || (intent & H5F_ACC_EXCL))
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, H5I_INVALID_HID, "invalid file open flags");
} /* end if */
/* Set file close degree for new file to "weak" */
if (H5P_set(fa_plist, H5F_ACS_CLOSE_DEGREE_NAME, &fc_degree) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, H5I_INVALID_HID, "can't set file close degree");
/* Get the current elink prefix */
if (H5P_peek(plist, H5L_ACS_ELINK_PREFIX_NAME, &elink_prefix) < 0)
HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, H5I_INVALID_HID, "can't get external link prefix");
/* Search for the target file */
if (NULL == (ext_file = H5F_prefix_open_file(loc.oloc->file, H5F_PREFIX_ELINK, elink_prefix, file_name,
intent, fapl_id)))
HGOTO_ERROR(H5E_LINK, H5E_CANTOPENFILE, H5I_INVALID_HID,
"unable to open external file, external link file name = '%s'", file_name);
/* Retrieve the "group location" for the file's root group */
if (H5G_root_loc(ext_file, &root_loc) < 0)
HGOTO_ERROR(H5E_LINK, H5E_BADVALUE, H5I_INVALID_HID, "unable to create location for file");
/* Open the object referenced in the external file */
if (NULL == (ext_obj = H5O_open_name(&root_loc, obj_name, &opened_type)))
HGOTO_ERROR(H5E_LINK, H5E_CANTOPENOBJ, H5I_INVALID_HID, "unable to open object");
/* Get an ID for the external link's object */
if ((ext_obj_id = H5VL_wrap_register(opened_type, ext_obj, true)) < 0)
HGOTO_ERROR(H5E_ID, H5E_CANTREGISTER, H5I_INVALID_HID, "unable to register external link object");
/* Set return value */
ret_value = ext_obj_id;
done:
/* XXX (VOL MERGE): Probably also want to consider closing ext_obj here on failures */
/* Release resources */
if (fapl_id > 0 && H5I_dec_ref(fapl_id) < 0)
HDONE_ERROR(H5E_ID, H5E_CANTRELEASE, H5I_INVALID_HID,
"unable to close ID for file access property list");
if (ext_file && H5F_efc_close(loc.oloc->file, ext_file) < 0)
HDONE_ERROR(H5E_LINK, H5E_CANTCLOSEFILE, H5I_INVALID_HID, "problem closing external file");
if (parent_group_name && parent_group_name != local_group_name)
parent_group_name = (char *)H5MM_xfree(parent_group_name);
if (ret_value < 0) {
/* Close object if it's open and something failed */
if (ext_obj_id >= 0 && H5I_dec_ref(ext_obj_id) < 0)
HDONE_ERROR(H5E_ID, H5E_CANTRELEASE, H5I_INVALID_HID, "unable to close ID for external object");
} /* end if */
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5L__extern_traverse() */
/*-------------------------------------------------------------------------
* Function: H5L__extern_query
*
* Purpose: Default query function for external links. This can
* be overridden using H5Lregister().
*
* Returns the size of the link's user data. If a buffer of
* is provided, copies at most buf_size bytes of the udata
* into it.
*
* Return: Size of buffer on success/Negative on failure
*
*-------------------------------------------------------------------------
*/
static ssize_t
H5L__extern_query(const char H5_ATTR_UNUSED *link_name, const void *_udata, size_t udata_size,
void *buf /*out*/, size_t buf_size)
{
const uint8_t *udata = (const uint8_t *)_udata; /* Pointer to external link buffer */
ssize_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_PACKAGE
/* Check external link version & flags */
if (((*udata >> 4) & 0x0F) != H5L_EXT_VERSION)
HGOTO_ERROR(H5E_LINK, H5E_CANTDECODE, FAIL, "bad version number for external link");
if ((*udata & 0x0F) & ~H5L_EXT_FLAGS_ALL)
HGOTO_ERROR(H5E_LINK, H5E_CANTDECODE, FAIL, "bad flags for external link");
/* If the buffer is NULL, skip writing anything in it and just return
* the size needed */
if (buf) {
if (udata_size < buf_size)
buf_size = udata_size;
/* Copy the udata verbatim up to buf_size */
H5MM_memcpy(buf, udata, buf_size);
} /* end if */
/* Set return value */
ret_value = (ssize_t)udata_size;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5L__extern_query() */
/*-------------------------------------------------------------------------
* Function: H5L_register_external
*
* Purpose: Registers default "External Link" link class.
* Use during library initialization or to restore the default
* after users change it.
*
* Return: Non-negative on success/ negative on failure
*
*-------------------------------------------------------------------------
*/
herr_t
H5L_register_external(void)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(FAIL)
if (H5L_register(H5L_EXTERN_LINK_CLASS) < 0)
HGOTO_ERROR(H5E_LINK, H5E_NOTREGISTERED, FAIL, "unable to register external link class");
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5L_register_external() */
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