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|
/*
* Copyright © 1999-2001 NCSA
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Tuesday, August 10, 1999
*
* Purpose: A driver which stores the HDF5 data in main memory using
* only the HDF5 public API. This driver is useful for fast
* access to small, temporary hdf5 files.
*/
#include "H5private.h" /*library functions */
#include "H5Eprivate.h" /*error handling */
#include "H5Fprivate.h" /*files */
#include "H5FDprivate.h" /*file driver */
#include "H5FDcore.h" /* Core file driver */
#include "H5MMprivate.h" /* Memory allocation */
#include "H5Pprivate.h" /*property lists */
#undef MAX
#define MAX(X,Y) ((X)>(Y)?(X):(Y))
#undef MIN
#define MIN(X,Y) ((X)<(Y)?(X):(Y))
/* The driver identification number, initialized at runtime */
static hid_t H5FD_CORE_g = 0;
/*
* The description of a file belonging to this driver. The `eoa' and `eof'
* determine the amount of hdf5 address space in use and the high-water mark
* of the file (the current size of the underlying memory).
*/
typedef struct H5FD_core_t {
H5FD_t pub; /*public stuff, must be first */
char *name; /*for equivalence testing */
unsigned char *mem; /*the underlying memory */
haddr_t eoa; /*end of allocated region */
haddr_t eof; /*current allocated size */
size_t increment; /*multiples for mem allocation */
int fd; /*backing store file descriptor */
hbool_t dirty; /*changes not saved? */
} H5FD_core_t;
/* Driver-specific file access properties */
typedef struct H5FD_core_fapl_t {
size_t increment; /*how much to grow memory */
hbool_t backing_store; /*write to file name on flush */
} H5FD_core_fapl_t;
/* Allocate memory in multiples of this size by default */
#define H5FD_CORE_INCREMENT 8192
/*
* These macros check for overflow of various quantities. These macros
* assume that file_offset_t is signed and haddr_t and size_t are unsigned.
*
* ADDR_OVERFLOW: Checks whether a file address of type `haddr_t'
* is too large to be represented by the second argument
* of the file seek function.
*
* SIZE_OVERFLOW: Checks whether a buffer size of type `hsize_t' is too
* large to be represented by the `size_t' type.
*
* REGION_OVERFLOW: Checks whether an address and size pair describe data
* which can be addressed entirely in memory.
*/
#define MAXADDR ((haddr_t)~(size_t)0)
#define ADDR_OVERFLOW(A) (HADDR_UNDEF==(A) || \
((A) & ~(haddr_t)MAXADDR))
#define SIZE_OVERFLOW(Z) ((Z) & ~(hsize_t)MAXADDR)
#define REGION_OVERFLOW(A,Z) (ADDR_OVERFLOW(A) || SIZE_OVERFLOW(Z) || \
HADDR_UNDEF==(A)+(Z) || \
(size_t)((A)+(Z))<(size_t)(A))
/* Prototypes */
static void *H5FD_core_fapl_get(H5FD_t *_file);
static H5FD_t *H5FD_core_open(const char *name, unsigned flags, hid_t fapl_id,
haddr_t maxaddr);
static herr_t H5FD_core_flush(H5FD_t *_file);
static herr_t H5FD_core_close(H5FD_t *_file);
static int H5FD_core_cmp(const H5FD_t *_f1, const H5FD_t *_f2);
static haddr_t H5FD_core_get_eoa(H5FD_t *_file);
static herr_t H5FD_core_set_eoa(H5FD_t *_file, haddr_t addr);
static haddr_t H5FD_core_get_eof(H5FD_t *_file);
static herr_t H5FD_core_read(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
size_t size, void *buf);
static herr_t H5FD_core_write(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
size_t size, const void *buf);
static const H5FD_class_t H5FD_core_g = {
"core", /*name */
MAXADDR, /*maxaddr */
NULL, /*sb_size */
NULL, /*sb_encode */
NULL, /*sb_decode */
sizeof(H5FD_core_fapl_t), /*fapl_size */
H5FD_core_fapl_get, /*fapl_get */
NULL, /*fapl_copy */
NULL, /*fapl_free */
0, /*dxpl_size */
NULL, /*dxpl_copy */
NULL, /*dxpl_free */
H5FD_core_open, /*open */
H5FD_core_close, /*close */
H5FD_core_cmp, /*cmp */
NULL, /*query */
NULL, /*alloc */
NULL, /*free */
H5FD_core_get_eoa, /*get_eoa */
H5FD_core_set_eoa, /*set_eoa */
H5FD_core_get_eof, /*get_eof */
H5FD_core_read, /*read */
H5FD_core_write, /*write */
H5FD_core_flush, /*flush */
H5FD_FLMAP_SINGLE, /*fl_map */
};
/* Interface initialization */
#define PABLO_MASK H5FD_core_mask
#define INTERFACE_INIT H5FD_core_init
static int interface_initialize_g = 0;
/*-------------------------------------------------------------------------
* Function: H5FD_core_init
*
* Purpose: Initialize this driver by registering the driver with the
* library.
*
* Return: Success: The driver ID for the core driver.
*
* Failure: Negative.
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
hid_t
H5FD_core_init(void)
{
FUNC_ENTER(H5FD_core_init, FAIL);
if (H5I_VFL!=H5Iget_type(H5FD_CORE_g))
H5FD_CORE_g = H5FDregister(&H5FD_core_g);
FUNC_LEAVE(H5FD_CORE_g);
}
/*-------------------------------------------------------------------------
* Function: H5Pset_fapl_core
*
* Purpose: Modify the file access property list to use the H5FD_CORE
* driver defined in this source file. The INCREMENT specifies
* how much to grow the memory each time we need more.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Thursday, February 19, 1998
*
* Modifications:
* Robb Matzke, 1999-10-19
* Added the BACKING_STORE argument. If set then the entire file
* contents are flushed to a file with the same name as this
* core file.
*
* Raymond Lu, 2001-10-25
* Changed the file access list to the new generic list.
*
*-------------------------------------------------------------------------
*/
herr_t
H5Pset_fapl_core(hid_t fapl_id, size_t increment, hbool_t backing_store)
{
herr_t ret_value=FAIL;
H5FD_core_fapl_t fa;
FUNC_ENTER(H5FD_set_fapl_core, FAIL);
H5TRACE3("e","izb",fapl_id,increment,backing_store);
/* Check argument */
if(H5I_GENPROP_LST != H5I_get_type(fapl_id) ||
TRUE != H5Pisa_class(fapl_id, H5P_FILE_ACCESS))
HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL,
"not a file access property list");
fa.increment = increment;
fa.backing_store = backing_store;
ret_value= H5Pset_driver(fapl_id, H5FD_CORE, &fa);
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5Pget_fapl_core
*
* Purpose: Queries properties set by the H5Pset_fapl_core() function.
*
* Return: Success: Non-negative
*
* Failure: Negative
*
* Programmer: Robb Matzke
* Tuesday, August 10, 1999
*
* Modifications:
* Robb Matzke, 1999-10-19
* Added the BACKING_STORE argument.
*
* Raymond Lu
* 2001-10-25
* Changed file access list to the new generic property list.
*
*-------------------------------------------------------------------------
*/
herr_t
H5Pget_fapl_core(hid_t fapl_id, size_t *increment/*out*/,
hbool_t *backing_store/*out*/)
{
H5FD_core_fapl_t *fa;
FUNC_ENTER(H5Pget_fapl_core, FAIL);
H5TRACE3("e","ixx",fapl_id,increment,backing_store);
if(H5I_GENPROP_LST != H5I_get_type(fapl_id) ||
TRUE != H5Pisa_class(fapl_id, H5P_FILE_ACCESS))
HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL,
"not a file access property list");
if (H5FD_CORE!=H5P_get_driver(fapl_id))
HRETURN_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "incorrect VFL driver");
if (NULL==(fa=H5Pget_driver_info(fapl_id)))
HRETURN_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "bad VFL driver info");
if (increment) *increment = fa->increment;
if (backing_store) *backing_store = fa->backing_store;
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_fapl_get
*
* Purpose: Returns a copy of the file access properties.
*
* Return: Success: Ptr to new file access properties.
*
* Failure: NULL
*
* Programmer: Robb Matzke
* Friday, August 13, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static void *
H5FD_core_fapl_get(H5FD_t *_file)
{
H5FD_core_t *file = (H5FD_core_t*)_file;
H5FD_core_fapl_t *fa = NULL;
FUNC_ENTER(H5FD_core_fapl_get, NULL);
if (NULL==(fa=H5MM_calloc(sizeof(H5FD_core_fapl_t))))
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
"memory allocation failed");
fa->increment = file->increment;
fa->backing_store = (file->fd>=0);
FUNC_LEAVE(fa);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_open
*
* Purpose: Create memory as an HDF5 file.
*
* Return: Success: A pointer to a new file data structure. The
* public fields will be initialized by the
* caller, which is always H5FD_open().
*
* Failure: NULL
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
* Robb Matzke, 1999-10-19
* The backing store file is created and opened if specified.
*-------------------------------------------------------------------------
*/
static H5FD_t *
H5FD_core_open(const char *name, unsigned UNUSED flags, hid_t fapl_id,
haddr_t maxaddr)
{
H5FD_core_t *file=NULL;
H5FD_core_fapl_t *fa=NULL;
int fd=-1;
FUNC_ENTER(H5FD_init_interface, NULL);
/* Check arguments */
if (0==maxaddr || HADDR_UNDEF==maxaddr)
HRETURN_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr");
if (ADDR_OVERFLOW(maxaddr))
HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, NULL, "maxaddr overflow");
if (H5P_DEFAULT!=fapl_id) fa = H5Pget_driver_info(fapl_id);
/* Open backing store */
if (fa && fa->backing_store && name &&
(fd=HDopen(name, O_CREAT|O_TRUNC|O_RDWR, 0666))<0) {
HRETURN_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL,
"unable to open backing store");
}
/* Create the new file struct */
if (NULL==(file=H5MM_calloc(sizeof(H5FD_core_t))))
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
"unable to allocate file struct");
file->fd = fd;
if (name && *name) {
file->name = HDstrdup(name);
}
/*
* The increment comes from either the file access property list or the
* default value. But if the file access property list was zero then use
* the default value instead.
*/
file->increment = (fa && fa->increment>0) ?
fa->increment : H5FD_CORE_INCREMENT;
FUNC_LEAVE((H5FD_t*)file);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_flush
*
* Purpose: Flushes the file to backing store if there is any and if the
* dirty flag is set.
*
* Return: Success: 0
*
* Failure: -1
*
* Programmer: Robb Matzke
* Friday, October 15, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_core_flush(H5FD_t *_file)
{
H5FD_core_t *file = (H5FD_core_t*)_file;
FUNC_ENTER(H5FD_core_flush, FAIL);
/* Write to backing store */
if (file->dirty && file->fd>=0) {
haddr_t size = file->eof;
unsigned char *ptr = file->mem;
if (0!=HDlseek(file->fd, (off_t)0, SEEK_SET))
HRETURN_ERROR(H5E_IO, H5E_SEEKERROR, FAIL,
"error seeking in backing store");
while (size) {
ssize_t n;
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
n = HDwrite(file->fd, ptr, (size_t)size);
if (n<0 && EINTR==errno) continue;
if (n<0)
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"error writing backing store");
ptr += (size_t)n;
size -= (size_t)n;
}
file->dirty = FALSE;
}
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_close
*
* Purpose: Closes the file.
*
* Return: Success: 0
*
* Failure: -1
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
* Robb Matzke, 1999-10-19
* The contents of memory are written to the backing store if
* one is open.
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_core_close(H5FD_t *_file)
{
H5FD_core_t *file = (H5FD_core_t*)_file;
FUNC_ENTER(H5FD_core_close, FAIL);
/* Flush */
if (H5FD_core_flush(_file)<0)
HRETURN_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to flush file");
/* Release resources */
if (file->fd>=0) HDclose(file->fd);
if (file->name) H5MM_xfree(file->name);
if (file->mem) H5MM_xfree(file->mem);
HDmemset(file, 0, sizeof(H5FD_core_t));
H5MM_xfree(file);
FUNC_LEAVE(0);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_cmp
*
* Purpose: Compares two files belonging to this driver by name. If one
* file doesn't have a name then it is less than the other file.
* If neither file has a name then the comparison is by file
* address.
*
* Return: Success: A value like strcmp()
*
* Failure: never fails (arguments were checked by the
* caller).
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static int
H5FD_core_cmp(const H5FD_t *_f1, const H5FD_t *_f2)
{
const H5FD_core_t *f1 = (const H5FD_core_t*)_f1;
const H5FD_core_t *f2 = (const H5FD_core_t*)_f2;
int ret_value;
FUNC_ENTER(H5FD_core_cmp, FAIL);
if (NULL==f1->name && NULL==f2->name) {
if (f1<f2) HRETURN(-1);
if (f1>f2) HRETURN(1);
HRETURN(0);
}
if (NULL==f1->name) HRETURN(-1);
if (NULL==f2->name) HRETURN(1);
ret_value = HDstrcmp(f1->name, f2->name);
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_get_eoa
*
* Purpose: Gets the end-of-address marker for the file. The EOA marker
* is the first address past the last byte allocated in the
* format address space.
*
* Return: Success: The end-of-address marker.
*
* Failure: HADDR_UNDEF
*
* Programmer: Robb Matzke
* Monday, August 2, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static haddr_t
H5FD_core_get_eoa(H5FD_t *_file)
{
H5FD_core_t *file = (H5FD_core_t*)_file;
FUNC_ENTER(H5FD_core_get_eoa, HADDR_UNDEF);
FUNC_LEAVE(file->eoa);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_set_eoa
*
* Purpose: Set the end-of-address marker for the file. This function is
* called shortly after an existing HDF5 file is opened in order
* to tell the driver where the end of the HDF5 data is located.
*
* Return: Success: 0
*
* Failure: -1
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_core_set_eoa(H5FD_t *_file, haddr_t addr)
{
H5FD_core_t *file = (H5FD_core_t*)_file;
FUNC_ENTER(H5FD_core_set_eoa, FAIL);
if (ADDR_OVERFLOW(addr))
HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "address overflow");
file->eoa = addr;
FUNC_LEAVE(0);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_get_eof
*
* Purpose: Returns the end-of-file marker, which is the greater of
* either the size of the underlying memory or the HDF5
* end-of-address markers.
*
* Return: Success: End of file address, the first address past
* the end of the "file", either the memory
* or the HDF5 file.
*
* Failure: HADDR_UNDEF
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static haddr_t
H5FD_core_get_eof(H5FD_t *_file)
{
H5FD_core_t *file = (H5FD_core_t*)_file;
FUNC_ENTER(H5FD_core_get_eof, HADDR_UNDEF);
FUNC_LEAVE(MAX(file->eof, file->eoa));
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_read
*
* Purpose: Reads SIZE bytes of data from FILE beginning at address ADDR
* into buffer BUF according to data transfer properties in
* DXPL_ID.
*
* Return: Success: Zero. Result is stored in caller-supplied
* buffer BUF.
*
* Failure: -1, Contents of buffer BUF are undefined.
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_core_read(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t UNUSED dxpl_id, haddr_t addr,
size_t size, void *buf/*out*/)
{
H5FD_core_t *file = (H5FD_core_t*)_file;
FUNC_ENTER(H5FD_core_read, FAIL);
assert(file && file->pub.cls);
assert(buf);
/* Check for overflow conditions */
if (HADDR_UNDEF == addr)
HRETURN_ERROR(H5E_IO, H5E_OVERFLOW, FAIL, "file address overflowed");
if (REGION_OVERFLOW(addr, size))
HRETURN_ERROR(H5E_IO, H5E_OVERFLOW, FAIL, "file address overflowed");
if (addr + size > file->eoa)
HRETURN_ERROR(H5E_IO, H5E_OVERFLOW, FAIL, "file address overflowed");
/* Read the part which is before the EOF marker */
if (addr < file->eof) {
size_t nbytes = MIN(size, file->eof-addr);
HDmemcpy(buf, file->mem + addr, nbytes);
size -= nbytes;
addr += nbytes;
buf = (char *)buf + nbytes;
}
/* Read zeros for the part which is after the EOF markers */
if (size > 0) {
HDmemset(buf, 0, size);
}
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5FD_core_write
*
* Purpose: Writes SIZE bytes of data to FILE beginning at address ADDR
* from buffer BUF according to data transfer properties in
* DXPL_ID.
*
* Return: Success: Zero
*
* Failure: -1
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_core_write(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t UNUSED dxpl_id, haddr_t addr,
size_t size, const void *buf)
{
H5FD_core_t *file = (H5FD_core_t*)_file;
FUNC_ENTER(H5FD_core_write, FAIL);
assert(file && file->pub.cls);
assert(buf);
/* Check for overflow conditions */
if (REGION_OVERFLOW(addr, size))
HRETURN_ERROR(H5E_IO, H5E_OVERFLOW, FAIL, "file address overflowed");
if (addr+size>file->eoa)
HRETURN_ERROR(H5E_IO, H5E_OVERFLOW, FAIL, "file address overflowed");
/*
* Allocate more memory if necessary, careful of overflow. Also, if the
* allocation fails then the file should remain in a usable state. Be
* careful of non-Posix realloc() that doesn't understand what to do when
* the first argument is null.
*/
if (addr+size>file->eof) {
unsigned char *x;
size_t new_eof = file->increment * ((addr+size)/file->increment);
if ((addr+size) % file->increment)
new_eof += file->increment;
if (NULL==file->mem)
x = H5MM_malloc(new_eof);
else
x = H5MM_realloc(file->mem, new_eof);
if (!x)
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
"unable to allocate memory block");
file->mem = x;
file->eof = new_eof;
}
/* Write from BUF to memory */
HDmemcpy(file->mem+addr, buf, size);
file->dirty = TRUE;
FUNC_LEAVE(SUCCEED);
}
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