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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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 COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5FDint.c
*
* Purpose: Internal routine for VFD operations
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#include "H5FDmodule.h" /* This source code file is part of the H5FD module */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5CXprivate.h" /* API Contexts */
#include "H5Eprivate.h" /* Error handling */
#include "H5Fprivate.h" /* File access */
#include "H5FDpkg.h" /* File Drivers */
#include "H5Iprivate.h" /* IDs */
/****************/
/* Local Macros */
/****************/
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/*-------------------------------------------------------------------------
* Function: H5FD_locate_signature
*
* Purpose: Finds the HDF5 superblock signature in a file. The
* signature can appear at address 0, or any power of two
* beginning with 512.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5FD_locate_signature(H5FD_t *file, haddr_t *sig_addr)
{
haddr_t addr = HADDR_UNDEF;
haddr_t eoa = HADDR_UNDEF;
haddr_t eof = HADDR_UNDEF;
uint8_t buf[H5F_SIGNATURE_LEN];
unsigned n;
unsigned maxpow;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT
/* Sanity checks */
HDassert(file);
HDassert(sig_addr);
/* Find the least N such that 2^N is larger than the file size */
eof = H5FD_get_eof(file, H5FD_MEM_SUPER);
eoa = H5FD_get_eoa(file, H5FD_MEM_SUPER);
addr = MAX(eof, eoa);
if(HADDR_UNDEF == addr)
HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "unable to obtain EOF/EOA value")
for(maxpow = 0; addr; maxpow++)
addr >>= 1;
maxpow = MAX(maxpow, 9);
/* Search for the file signature at format address zero followed by
* powers of two larger than 9.
*/
for(n = 8; n < maxpow; n++) {
addr = (8 == n) ? 0 : (haddr_t)1 << n;
if(H5FD_set_eoa(file, H5FD_MEM_SUPER, addr + H5F_SIGNATURE_LEN) < 0)
HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "unable to set EOA value for file signature")
if(H5FD_read(file, H5FD_MEM_SUPER, addr, (size_t)H5F_SIGNATURE_LEN, buf) < 0)
HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "unable to read file signature")
if(!HDmemcmp(buf, H5F_SIGNATURE, (size_t)H5F_SIGNATURE_LEN))
break;
}
/* If the signature was not found then reset the EOA value and return
* HADDR_UNDEF.
*/
if(n >= maxpow) {
if(H5FD_set_eoa(file, H5FD_MEM_SUPER, eoa) < 0)
HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "unable to reset EOA value")
*sig_addr = HADDR_UNDEF;
}
else
/* Set return value */
*sig_addr = addr;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_locate_signature() */
/*-------------------------------------------------------------------------
* Function: H5FD_read
*
* Purpose: Private version of H5FDread()
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5FD_read(H5FD_t *file, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/)
{
hid_t dxpl_id = H5I_INVALID_HID; /* DXPL for operation */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(FAIL)
/* Sanity checks */
HDassert(file);
HDassert(file->cls);
HDassert(buf);
/* Get proper DXPL for I/O */
dxpl_id = H5CX_get_dxpl();
#ifndef H5_HAVE_PARALLEL
/* The no-op case
*
* Do not return early for Parallel mode since the I/O could be a
* collective transfer.
*/
if(0 == size)
HGOTO_DONE(SUCCEED)
#endif /* H5_HAVE_PARALLEL */
/* If the file is open for SWMR read access, allow access to data past
* the end of the allocated space (the 'eoa'). This is done because the
* eoa stored in the file's superblock might be out of sync with the
* objects being written within the file by the application performing
* SWMR write operations.
*/
if(!(file->access_flags & H5F_ACC_SWMR_READ)) {
haddr_t eoa;
if(HADDR_UNDEF == (eoa = (file->cls->get_eoa)(file, type)))
HGOTO_ERROR(H5E_VFL, H5E_CANTINIT, FAIL, "driver get_eoa request failed")
if((addr + file->base_addr + size) > eoa)
HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow, addr = %llu, size = %llu, eoa = %llu", (unsigned long long)(addr + file->base_addr), (unsigned long long)size, (unsigned long long)eoa)
}
/* Dispatch to driver */
if((file->cls->read)(file, type, dxpl_id, addr + file->base_addr, size, buf) < 0)
HGOTO_ERROR(H5E_VFL, H5E_READERROR, FAIL, "driver read request failed")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_read() */
/*-------------------------------------------------------------------------
* Function: H5FD_write
*
* Purpose: Private version of H5FDwrite()
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5FD_write(H5FD_t *file, H5FD_mem_t type, haddr_t addr, size_t size, const void *buf)
{
hid_t dxpl_id; /* DXPL for operation */
haddr_t eoa = HADDR_UNDEF; /* EOA for file */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(FAIL)
/* Sanity checks */
HDassert(file);
HDassert(file->cls);
HDassert(buf);
/* Get proper DXPL for I/O */
dxpl_id = H5CX_get_dxpl();
#ifndef H5_HAVE_PARALLEL
/* The no-op case
*
* Do not return early for Parallel mode since the I/O could be a
* collective transfer.
*/
if(0 == size)
HGOTO_DONE(SUCCEED)
#endif /* H5_HAVE_PARALLEL */
if(HADDR_UNDEF == (eoa = (file->cls->get_eoa)(file, type)))
HGOTO_ERROR(H5E_VFL, H5E_CANTINIT, FAIL, "driver get_eoa request failed")
if((addr + file->base_addr + size) > eoa)
HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow, addr = %llu, size=%llu, eoa=%llu",
(unsigned long long)(addr+ file->base_addr), (unsigned long long)size, (unsigned long long)eoa)
/* Dispatch to driver */
if((file->cls->write)(file, type, dxpl_id, addr + file->base_addr, size, buf) < 0)
HGOTO_ERROR(H5E_VFL, H5E_WRITEERROR, FAIL, "driver write request failed")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_write() */
/*-------------------------------------------------------------------------
* Function: H5FD_set_eoa
*
* Purpose: Private version of H5FDset_eoa()
*
* This function expects the EOA is a RELATIVE address, i.e.
* relative to the base address. This is NOT the same as the
* EOA stored in the superblock, which is an absolute
* address. Object addresses are relative.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5FD_set_eoa(H5FD_t *file, H5FD_mem_t type, haddr_t addr)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(FAIL)
HDassert(file && file->cls);
HDassert(H5F_addr_defined(addr) && addr <= file->maxaddr);
/* Dispatch to driver, convert to absolute address */
if((file->cls->set_eoa)(file, type, addr + file->base_addr) < 0)
HGOTO_ERROR(H5E_VFL, H5E_CANTINIT, FAIL, "driver set_eoa request failed")
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_set_eoa() */
/*-------------------------------------------------------------------------
* Function: H5FD_get_eoa
*
* Purpose: Private version of H5FDget_eoa()
*
* This function returns the EOA as a RELATIVE address, i.e.
* relative to the base address. This is NOT the same as the
* EOA stored in the superblock, which is an absolute
* address. Object addresses are relative.
*
* Return: Success: First byte after allocated memory
*
* Failure: HADDR_UNDEF
*
*-------------------------------------------------------------------------
*/
haddr_t
H5FD_get_eoa(const H5FD_t *file, H5FD_mem_t type)
{
haddr_t ret_value = HADDR_UNDEF; /* Return value */
FUNC_ENTER_NOAPI(HADDR_UNDEF)
HDassert(file && file->cls);
/* Dispatch to driver */
if(HADDR_UNDEF == (ret_value = (file->cls->get_eoa)(file, type)))
HGOTO_ERROR(H5E_VFL, H5E_CANTINIT, HADDR_UNDEF, "driver get_eoa request failed")
/* Adjust for base address in file (convert to relative address) */
ret_value -= file->base_addr;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_get_eoa() */
/*-------------------------------------------------------------------------
* Function: H5FD_get_eof
*
* Purpose: Private version of H5FDget_eof()
*
* This function returns the EOF as a RELATIVE address, i.e.
* relative to the base address. This will be different
* from the end of the physical file if there is a user
* block.
*
* Return: Success: The EOF address.
*
* Failure: HADDR_UNDEF
*
*-------------------------------------------------------------------------
*/
haddr_t
H5FD_get_eof(const H5FD_t *file, H5FD_mem_t type)
{
haddr_t ret_value = HADDR_UNDEF; /* Return value */
FUNC_ENTER_NOAPI(HADDR_UNDEF)
HDassert(file && file->cls);
/* Dispatch to driver */
if(file->cls->get_eof) {
if(HADDR_UNDEF == (ret_value = (file->cls->get_eof)(file, type)))
HGOTO_ERROR(H5E_VFL, H5E_CANTGET, HADDR_UNDEF, "driver get_eof request failed")
}
else
ret_value = file->maxaddr;
/* Adjust for base address in file (convert to relative address) */
ret_value -= file->base_addr;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_get_eof() */
/*-------------------------------------------------------------------------
* Function: H5FD_driver_query
*
* Purpose: Similar to H5FD_query(), but intended for cases when we don't
* have a file available (e.g. before one is opened). Since we
* can't use the file to get the driver, the driver is passed in
* as a parameter.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5FD_driver_query(const H5FD_class_t *driver, unsigned long *flags/*out*/)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT_NOERR
HDassert(driver);
HDassert(flags);
/* Check for the driver to query and then query it */
if(driver->query)
ret_value = (driver->query)(NULL, flags);
else
*flags = 0;
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_driver_query() */
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