/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Copyright by The HDF Group. * * Copyright by the Board of Trustees of the University of Illinois. * * 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 files COPYING and Copyright.html. COPYING can be found at the root * * of the source code distribution tree; Copyright.html can be found at the * * root level of an installed copy of the electronic HDF5 document set and * * is linked from the top-level documents page. It can also be found at * * http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have * * access to either file, you may request a copy from help@hdfgroup.org. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ #define H5F_PACKAGE /*suppress error about including H5Fpkg */ /* Interface initialization */ #define H5_INTERFACE_INIT_FUNC H5F_init_super_interface /* Packages needed by this file... */ #include "H5private.h" /* Generic Functions */ #include "H5Eprivate.h" /* Error handling */ #include "H5Fpkg.h" /* File access */ #include "H5FDprivate.h" /* File drivers */ #include "H5Iprivate.h" /* IDs */ #include "H5Pprivate.h" /* Property lists */ /* PRIVATE PROTOTYPES */ /*-------------------------------------------------------------------------- NAME H5F_init_super_interface -- Initialize interface-specific information USAGE herr_t H5T_init_super_interface() RETURNS Non-negative on success/Negative on failure DESCRIPTION Initializes any interface-specific data or routines. (Just calls H5F_init_iterface currently). --------------------------------------------------------------------------*/ static herr_t H5F_init_super_interface(void) { FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5F_init_super_interface) FUNC_LEAVE_NOAPI(H5F_init()) } /* H5F_init_super_interface() */ /*------------------------------------------------------------------------- * Function: H5F_read_superblock * * Purpose: Reads the superblock from the file or from the BUF. If * ADDR is a valid address, then it reads it from the file. * If not, then BUF must be non-NULL for it to read from the * BUF. * * Return: Success: SUCCEED * Failure: FAIL * * Programmer: Bill Wendling * wendling@ncsa.uiuc.edu * Sept 12, 2003 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5F_read_superblock(H5F_t *f, hid_t dxpl_id, H5G_entry_t *root_ent) { haddr_t stored_eoa; /*relative end-of-addr in file */ haddr_t eof; /*end of file address */ uint8_t *q; /*ptr into temp I/O buffer */ size_t sizeof_addr = 0; size_t sizeof_size = 0; const size_t fixed_size = 24; /*fixed sizeof superblock */ unsigned sym_leaf_k = 0; size_t variable_size; /*variable sizeof superblock */ unsigned btree_k[H5B_NUM_BTREE_ID]; /* B-tree internal node 'K' values */ H5F_file_t *shared = NULL; /* shared part of `file' */ H5FD_t *lf = NULL; /* file driver part of `shared' */ uint8_t *p; /* Temporary pointer into encoding buffers */ unsigned i; /* Index variable */ unsigned chksum; /* Checksum temporary variable */ size_t driver_size; /* Size of driver info block, in bytes */ char driver_name[9]; /* Name of driver, for driver info block */ unsigned super_vers; /* Super block version */ unsigned freespace_vers; /* Freespace info version */ unsigned obj_dir_vers; /* Object header info version */ unsigned share_head_vers; /* Shared header info version */ uint8_t buf[H5F_SUPERBLOCK_SIZE]; /* Local buffer */ H5P_genplist_t *c_plist; /* File creation property list */ herr_t ret_value = SUCCEED; /* Decoding */ FUNC_ENTER_NOAPI(H5F_read_superblock, FAIL) /* Short cuts */ shared = f->shared; lf = shared->lf; /* Get the shared file creation property list */ if (NULL == (c_plist = H5I_object(shared->fcpl_id))) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't get property list") /* Read the superblock if it hasn't been read before. */ if (HADDR_UNDEF == (shared->super_addr=H5F_locate_signature(lf,dxpl_id))) HGOTO_ERROR(H5E_FILE, H5E_NOTHDF5, FAIL, "unable to find file signature") if (H5FD_set_eoa(lf, shared->super_addr + fixed_size) < 0 || H5FD_read(lf, H5FD_MEM_SUPER, dxpl_id, shared->super_addr, fixed_size, buf) < 0) HGOTO_ERROR(H5E_FILE, H5E_READERROR, FAIL, "unable to read superblock") /* Signature, already checked */ p = buf + H5F_SIGNATURE_LEN; /* Superblock version */ super_vers = *p++; if (super_vers > HDF5_SUPERBLOCK_VERSION_MAX) HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "bad superblock version number") if (H5P_set(c_plist, H5F_CRT_SUPER_VERS_NAME, &super_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to set superblock version") /* Freespace version */ freespace_vers = *p++; if (HDF5_FREESPACE_VERSION != freespace_vers) HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "bad free space version number") if (H5P_set(c_plist, H5F_CRT_FREESPACE_VERS_NAME, &freespace_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to free space version") /* Root group version number */ obj_dir_vers = *p++; if (HDF5_OBJECTDIR_VERSION != obj_dir_vers) HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "bad object directory version number") if (H5P_set(c_plist, H5F_CRT_OBJ_DIR_VERS_NAME, &obj_dir_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to set object directory version") /* Skip over reserved byte */ p++; /* Shared header version number */ share_head_vers = *p++; if (HDF5_SHAREDHEADER_VERSION != share_head_vers) HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "bad shared-header format version number") if (H5P_set(c_plist, H5F_CRT_SHARE_HEAD_VERS_NAME, &share_head_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to set shared-header format version") /* Size of file addresses */ sizeof_addr = *p++; if (sizeof_addr != 2 && sizeof_addr != 4 && sizeof_addr != 8 && sizeof_addr != 16 && sizeof_addr != 32) HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "bad byte number in an address") if (H5P_set(c_plist, H5F_CRT_ADDR_BYTE_NUM_NAME,&sizeof_addr) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to set byte number in an address") shared->sizeof_addr = sizeof_addr; /* Keep a local copy also */ /* Size of file sizes */ sizeof_size = *p++; if (sizeof_size != 2 && sizeof_size != 4 && sizeof_size != 8 && sizeof_size != 16 && sizeof_size != 32) HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "bad byte number for object size") if (H5P_set(c_plist, H5F_CRT_OBJ_BYTE_NUM_NAME, &sizeof_size) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to set byte number for object size") shared->sizeof_size = sizeof_size; /* Keep a local copy also */ /* Skip over reserved byte */ p++; /* Various B-tree sizes */ UINT16DECODE(p, sym_leaf_k); if (sym_leaf_k == 0) HGOTO_ERROR(H5E_FILE, H5E_BADRANGE, FAIL, "bad symbol table leaf node 1/2 rank") if (H5P_set(c_plist, H5F_CRT_SYM_LEAF_NAME, &sym_leaf_k) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to set rank for symbol table leaf nodes") shared->sym_leaf_k = sym_leaf_k; /* Keep a local copy also */ /* Need 'get' call to set other array values */ if (H5P_get(c_plist, H5F_CRT_BTREE_RANK_NAME, btree_k) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "unable to get rank for btree internal nodes") UINT16DECODE(p, btree_k[H5B_SNODE_ID]); if (btree_k[H5B_SNODE_ID] == 0) HGOTO_ERROR(H5E_FILE, H5E_BADRANGE, FAIL, "bad 1/2 rank for btree internal nodes") /* * Delay setting the value in the property list until we've checked * for the indexed storage B-tree internal 'K' value later. */ /* File consistency flags. Not really used yet */ UINT32DECODE(p, shared->consist_flags); assert(((size_t)(p - buf)) == fixed_size); /* Decode the variable-length part of the superblock... */ variable_size = (super_vers>0 ? 4 : 0) + /* Potential indexed storage B-tree internal 'K' value */ H5F_SIZEOF_ADDR(f) + /*base addr*/ H5F_SIZEOF_ADDR(f) + /*global free list*/ H5F_SIZEOF_ADDR(f) + /*end-of-address*/ H5F_SIZEOF_ADDR(f) + /*reserved address*/ H5G_SIZEOF_ENTRY(f); /*root group ptr*/ assert(fixed_size + variable_size <= sizeof(buf)); if (H5FD_set_eoa(lf, shared->super_addr + fixed_size+variable_size) < 0 || H5FD_read(lf, H5FD_MEM_SUPER, dxpl_id, shared->super_addr + fixed_size, variable_size, p) < 0) HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to read superblock") /* * If the superblock version # is greater than 0, read in the indexed * storage B-tree internal 'K' value */ if (super_vers > 0) { UINT16DECODE(p, btree_k[H5B_ISTORE_ID]); p += 2; /* reserved */ } else btree_k[H5B_ISTORE_ID] = HDF5_BTREE_ISTORE_IK_DEF; /* Set the B-tree internal node values, etc */ if (H5P_set(c_plist, H5F_CRT_BTREE_RANK_NAME, btree_k) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to set rank for btree internal nodes") HDmemcpy(shared->btree_k, btree_k, sizeof(unsigned) * (size_t)H5B_NUM_BTREE_ID); /* Keep a local copy also */ H5F_addr_decode(f, (const uint8_t **)&p, &shared->base_addr/*out*/); H5F_addr_decode(f, (const uint8_t **)&p, &shared->freespace_addr/*out*/); H5F_addr_decode(f, (const uint8_t **)&p, &stored_eoa/*out*/); H5F_addr_decode(f, (const uint8_t **)&p, &shared->driver_addr/*out*/); if (H5G_ent_decode(f, (const uint8_t **)&p, root_ent/*out*/) < 0) HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to read root symbol entry") /* * Check if superblock address is different from base address and * adjust base address and "end of address" address if so. */ if (!H5F_addr_eq(shared->super_addr,shared->base_addr)) { /* Check if the superblock moved earlier in the file */ if (H5F_addr_lt(shared->super_addr, shared->base_addr)) stored_eoa -= (shared->base_addr - shared->super_addr); else /* The superblock moved later in the file */ stored_eoa += (shared->super_addr - shared->base_addr); shared->base_addr = shared->super_addr; } /* end if */ /* Compute super block checksum */ assert(sizeof(chksum) == sizeof(shared->super_chksum)); for (q = (uint8_t *)&chksum, chksum = 0, i = 0; i < fixed_size + variable_size; ++i) q[i % sizeof(shared->super_chksum)] ^= buf[i]; /* Set the super block checksum */ shared->super_chksum = chksum; /* Decode the optional driver information block */ if (H5F_addr_defined(shared->driver_addr)) { haddr_t drv_addr = shared->base_addr + shared->driver_addr; uint8_t dbuf[H5F_DRVINFOBLOCK_SIZE]; /* Local buffer */ if (H5FD_set_eoa(lf, drv_addr + 16) < 0 || H5FD_read(lf, H5FD_MEM_SUPER, dxpl_id, drv_addr, (size_t)16, dbuf) < 0) HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to read driver information block") p = dbuf; /* Version number */ if (HDF5_DRIVERINFO_VERSION != *p++) HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "bad driver information block version number") p += 3; /* reserved */ /* Driver info size */ UINT32DECODE(p, driver_size); /* Driver name and/or version */ HDstrncpy(driver_name, (const char *)p, (size_t)8); driver_name[8] = '\0'; p += 8; /* advance past name/version */ /* Read driver information and decode */ assert((driver_size + 16) <= sizeof(dbuf)); if (H5FD_set_eoa(lf, drv_addr + 16 + driver_size) < 0 || H5FD_read(lf, H5FD_MEM_SUPER, dxpl_id, drv_addr+16, driver_size, p) < 0) HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to read file driver information") if (H5FD_sb_decode(lf, driver_name, p) < 0) HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to decode driver information") /* Compute driver info block checksum */ assert(sizeof(chksum) == sizeof(shared->drvr_chksum)); for (q = (uint8_t *)&chksum, chksum = 0, i = 0; i < (driver_size + 16); ++i) q[i % sizeof(shared->drvr_chksum)] ^= dbuf[i]; /* Set the driver info block checksum */ shared->drvr_chksum = chksum; } /* end if */ /* * The user-defined data is the area of the file before the base * address. */ if (H5P_set(c_plist, H5F_CRT_USER_BLOCK_NAME, &shared->base_addr) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "unable to set usr block size") /* * Make sure that the data is not truncated. One case where this is * possible is if the first file of a family of files was opened * individually. */ if (HADDR_UNDEF == (eof = H5FD_get_eof(lf))) HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to determine file size") if (eof < stored_eoa) HGOTO_ERROR(H5E_FILE, H5E_TRUNCATED, FAIL, "truncated file") /* * Tell the file driver how much address space has already been * allocated so that it knows how to allocate additional memory. */ if (H5FD_set_eoa(lf, stored_eoa) < 0) HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to set end-of-address marker for file") done: FUNC_LEAVE_NOAPI(ret_value) } /*------------------------------------------------------------------------- * Function: H5F_init_superblock * * Purpose: Allocates the superblock for the file and initializes * information about the superblock in memory. Does not write * any superblock information to the file. * * Return: Success: SUCCEED * Failure: FAIL * * Programmer: Quincey Koziol * koziol@ncsa.uiuc.edu * Sept 15, 2003 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5F_init_superblock(const H5F_t *f, hid_t dxpl_id) { hsize_t userblock_size = 0; /* Size of userblock, in bytes */ size_t superblock_size; /* Size of superblock, in bytes */ size_t driver_size; /* Size of driver info block (bytes)*/ unsigned super_vers; /* Super block version */ haddr_t addr; /* Address of superblock */ H5P_genplist_t *plist; /* Property list */ herr_t ret_value=SUCCEED; /* Encoding */ FUNC_ENTER_NOAPI(H5F_init_superblock, FAIL) /* Get the shared file creation property list */ if (NULL == (plist = H5I_object(f->shared->fcpl_id))) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list") /* * The superblock starts immediately after the user-defined * header, which we have already insured is a proper size. The * base address is set to the same thing as the superblock for * now. */ if(H5P_get(plist, H5F_CRT_USER_BLOCK_NAME, &userblock_size) < 0) HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to get user block size") f->shared->super_addr = userblock_size; f->shared->base_addr = f->shared->super_addr; f->shared->consist_flags = 0x03; /* Grab superblock version from property list */ if (H5P_get(plist, H5F_CRT_SUPER_VERS_NAME, &super_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "unable to get super block version") /* Compute the size of the superblock */ superblock_size=H5F_SIGNATURE_LEN /* Signature length (8 bytes) */ + 16 /* Length of required fixed-size portion */ + ((super_vers>0) ? 4 : 0) /* Version specific fixed-size portion */ + 4 * H5F_sizeof_addr(f) /* Variable-sized addresses */ + H5G_SIZEOF_ENTRY(f); /* Size of root group symbol table entry */ /* Compute the size of the driver information block. */ H5_ASSIGN_OVERFLOW(driver_size, H5FD_sb_size(f->shared->lf), hsize_t, size_t); if (driver_size > 0) driver_size += 16; /* Driver block header */ /* * Allocate space for the userblock, superblock, and driver info * block. We do it with one allocation request because the * userblock and superblock need to be at the beginning of the * file and only the first allocation request is required to * return memory at format address zero. */ H5_CHECK_OVERFLOW(f->shared->base_addr, haddr_t, hsize_t); addr = H5FD_alloc(f->shared->lf, H5FD_MEM_SUPER, dxpl_id, ((hsize_t)f->shared->base_addr + superblock_size + driver_size)); if (HADDR_UNDEF == addr) HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to allocate file space for userblock and/or superblock") if (0 != addr) HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "file driver failed to allocate userblock and/or superblock at address zero") /* * The file driver information block begins immediately after the * superblock. */ if (driver_size > 0) f->shared->driver_addr = superblock_size; done: FUNC_LEAVE_NOAPI(ret_value) } /* end H5F_init_superblock() */ /*------------------------------------------------------------------------- * Function: H5F_write_superblock * * Purpose: Writes (and optionally allocates) the superblock for the file. * If BUF is non-NULL, then write the serialized superblock * information into it. It should be a buffer of size * H5F_SUPERBLOCK_SIZE + H5F_DRVINFOBLOCK_SIZE or larger. * * Return: Success: SUCCEED * Failure: FAIL * * Programmer: Bill Wendling * wendling@ncsa.uiuc.edu * Sept 12, 2003 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5F_write_superblock(H5F_t *f, hid_t dxpl_id) { uint8_t sbuf[H5F_SUPERBLOCK_SIZE]; /* Superblock encoding buffer */ uint8_t dbuf[H5F_DRVINFOBLOCK_SIZE];/* Driver info block encoding buffer*/ uint8_t *p = NULL; /* Ptr into encoding buffers */ unsigned i; /* Index variable */ unsigned chksum; /* Checksum temporary variable */ size_t superblock_size; /* Size of superblock, in bytes */ size_t driver_size; /* Size of driver info block (bytes)*/ char driver_name[9]; /* Name of driver, for driver info block */ unsigned super_vers; /* Super block version */ unsigned freespace_vers; /* Freespace info version */ unsigned obj_dir_vers; /* Object header info version */ unsigned share_head_vers; /* Shared header info version */ H5P_genplist_t *plist; /* Property list */ herr_t ret_value = SUCCEED; /* Encoding */ FUNC_ENTER_NOAPI(H5F_write_superblock, FAIL) /* Get the shared file creation property list */ if (NULL == (plist = H5I_object(f->shared->fcpl_id))) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list") /* Grab values from property list */ if (H5P_get(plist, H5F_CRT_SUPER_VERS_NAME, &super_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "unable to get super block version") if (H5P_get(plist, H5F_CRT_FREESPACE_VERS_NAME, &freespace_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "unable to get free space version") if (H5P_get(plist, H5F_CRT_OBJ_DIR_VERS_NAME, &obj_dir_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "unable to get object directory version") if (H5P_get(plist, H5F_CRT_SHARE_HEAD_VERS_NAME, &share_head_vers) < 0) HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "unable to get shared-header format version") /* Encode the file super block */ p = sbuf; HDmemcpy(p, H5F_SIGNATURE, (size_t)H5F_SIGNATURE_LEN); p += H5F_SIGNATURE_LEN; *p++ = (uint8_t)super_vers; *p++ = (uint8_t)freespace_vers; *p++ = (uint8_t)obj_dir_vers; *p++ = 0; /* reserved*/ *p++ = (uint8_t)share_head_vers; assert (H5F_SIZEOF_ADDR(f) <= 255); *p++ = (uint8_t)H5F_SIZEOF_ADDR(f); assert (H5F_SIZEOF_SIZE(f) <= 255); *p++ = (uint8_t)H5F_SIZEOF_SIZE(f); *p++ = 0; /* reserved */ UINT16ENCODE(p, f->shared->sym_leaf_k); UINT16ENCODE(p, f->shared->btree_k[H5B_SNODE_ID]); UINT32ENCODE(p, f->shared->consist_flags); /* * Versions of the superblock >0 have the indexed storage B-tree * internal 'K' value stored */ if (super_vers > 0) { UINT16ENCODE(p, f->shared->btree_k[H5B_ISTORE_ID]); *p++ = 0; /*reserved */ *p++ = 0; /*reserved */ } H5F_addr_encode(f, &p, f->shared->base_addr); H5F_addr_encode(f, &p, f->shared->freespace_addr); H5F_addr_encode(f, &p, H5FD_get_eoa(f->shared->lf)); H5F_addr_encode(f, &p, f->shared->driver_addr); if(H5G_ent_encode(f, &p, H5G_entof(f->shared->root_grp))<0) HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to encode root group information") H5_ASSIGN_OVERFLOW(superblock_size, p - sbuf, int, size_t); /* Double check we didn't overrun the block (unlikely) */ assert(superblock_size <= sizeof(sbuf)); /* Encode the driver information block. */ H5_ASSIGN_OVERFLOW(driver_size, H5FD_sb_size(f->shared->lf), hsize_t, size_t); if (driver_size > 0) { driver_size += 16; /* Driver block header */ /* Double check we didn't overrun the block (unlikely) */ assert(driver_size <= sizeof(dbuf)); /* Encode the driver information block */ p = dbuf; *p++ = HDF5_DRIVERINFO_VERSION; /* Version */ *p++ = 0; /* reserved */ *p++ = 0; /* reserved */ *p++ = 0; /* reserved */ /* Driver info size, excluding header */ UINT32ENCODE(p, driver_size - 16); /* Encode driver-specific data */ if (H5FD_sb_encode(f->shared->lf, driver_name, dbuf + 16) < 0) HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to encode driver information") /* Driver name */ HDmemcpy(dbuf + 8, driver_name, (size_t)8); } /* end if */ /* Compute super block checksum */ assert(sizeof(chksum) == sizeof(f->shared->super_chksum)); for (p = (uint8_t *)&chksum, chksum = 0, i = 0; i < superblock_size; ++i) p[i % sizeof(f->shared->super_chksum)] ^= sbuf[i]; /* Compare with current checksums */ if (chksum != f->shared->super_chksum) { /* Write superblock */ if (H5FD_write(f->shared->lf, H5FD_MEM_SUPER, dxpl_id, f->shared->super_addr, superblock_size, sbuf) < 0) HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to write superblock") /* Update checksum information if different */ f->shared->super_chksum = chksum; } /* end if */ /* Check for driver info block */ if (HADDR_UNDEF != f->shared->driver_addr) { /* Compute driver info block checksum */ assert(sizeof(chksum) == sizeof(f->shared->drvr_chksum)); for (p = (uint8_t *)&chksum, chksum = 0, i = 0; i < driver_size; ++i) p[i % sizeof(f->shared->drvr_chksum)] ^= dbuf[i]; /* Compare with current checksums */ if (chksum != f->shared->drvr_chksum) { /* Write driver information block */ if (H5FD_write(f->shared->lf, H5FD_MEM_SUPER, dxpl_id, f->shared->base_addr + f->shared->driver_addr, driver_size, dbuf) < 0) HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to write driver information block") /* Update checksum information if different */ f->shared->drvr_chksum = chksum; } /* end if */ } /* end if */ done: FUNC_LEAVE_NOAPI(ret_value) }