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|
/*
* Copyright (C) 1997 NCSA
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@viper.llnl.gov>
* Wednesday, October 22, 1997
*
* Purpose: This file contains virtual functions for the H5F_low
* class. These are functions that operate on various kinds
* of files at a level where the file is just a one-dimensional
* array of bytes.
*/
#include <H5private.h>
#include <H5Eprivate.h>
#include <H5Fprivate.h>
#include <H5MMprivate.h>
#define addr_defined(X) (((uint64_t)(-1)!=(X)->offset) ? TRUE : FALSE)
#define PABLO_MASK H5F_low
static intn interface_initialize_g = 0;
#define INTERFACE_INIT NULL
/*-------------------------------------------------------------------------
* Function: H5F_low_class
*
* Purpose: Given a driver identifier return the class pointer for that
* low-level driver.
*
* Return: Success: A low-level driver class pointer.
*
* Failure: NULL
*
* Programmer: Robb Matzke
* Wednesday, February 18, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
const H5F_low_class_t *
H5F_low_class (H5F_driver_t driver)
{
const H5F_low_class_t *type = NULL;
FUNC_ENTER (H5F_low_class, NULL);
switch (driver) {
case H5F_LOW_STDIO:
type = H5F_LOW_STDIO_g;
break;
case H5F_LOW_SEC2:
type = H5F_LOW_SEC2_g;
break;
case H5F_LOW_CORE:
type = H5F_LOW_CORE_g;
break;
#ifdef HAVE_PARALLEL
case H5F_LOW_MPIO:
type = H5F_LOW_MPIO_g;
break;
#endif
case H5F_LOW_SPLIT:
type = H5F_LOW_SPLIT_g;
break;
case H5F_LOW_FAMILY:
type = H5F_LOW_FAMILY_g;
break;
default:
HRETURN_ERROR (H5E_IO, H5E_UNSUPPORTED, NULL,
"unknown low-level driver");
}
FUNC_LEAVE (type);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_open
*
* Purpose: Opens a file of type TYPE with name NAME according to the
* field of bit flags FLAGS which are:
*
* H5F_ACC_WRITE: The file is open for read/write access.
* Without this bit set, the file would be open
* for read-only access.
*
* H5F_ACC_CREAT: The file is created if it doesn't already
* exist. On unix, the file permissions are set
* to 0666 modified by the umask.
*
* H5F_ACC_EXCL: This function will fail if the file already
* exists.
*
* H5F_ACC_TRUNC: Truncate the file to a zero-length file as it
* is opened. This allows existing files to be
* overwritten.
*
* The KEY argument is initialized with data which is unique to
* this file. Opening the same file (even by a different name)
* should return the same key.
*
* This is a virtual function only; the actual open operation is
* performed by the subclass. This function will fail if the
* subclass hasn't defined an open method.
*
* Errors:
* IO CANTOPENFILE Open failed.
*
* Return: Success: Pointer to the new file descriptor.
*
* Failure: NULL
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
H5F_low_t *
H5F_low_open(const H5F_low_class_t *type, const char *name,
const H5F_access_t *access_parms, uintn flags,
H5F_search_t *key/*out*/)
{
H5F_low_t *lf = NULL;
FUNC_ENTER(H5F_low_open, NULL);
assert(type && type->open);
assert(name && *name);
if (NULL == (lf = (type->open) (name, access_parms, flags, key))) {
HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed");
}
lf->type = type;
FUNC_LEAVE(lf);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_close
*
* Purpose: Closes a low-level file. The subclass should free all
* resources used by the file descriptor but should not free the
* file descriptor itself. The close method in the subclass is
* optional; lack of a close method results in only the file
* descriptor being freed.
*
* It is safe to call this function with a null pointer for the
* file descriptor. This function returns a null pointer that
* the caller can assign to the file descriptor pointer as it's
* closed like `desc=H5F_low_close(desc)'.
*
* Errors:
* IO CLOSEERROR Close failed.
*
* Return: Success: NULL
*
* Failure: NULL
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
H5F_low_t *
H5F_low_close(H5F_low_t *lf, const H5F_access_t *access_parms)
{
FUNC_ENTER(H5F_low_close, NULL);
if (lf) {
if ((lf->type->close) (lf, access_parms) < 0) {
H5MM_xfree(lf);
HRETURN_ERROR(H5E_IO, H5E_CLOSEERROR, NULL, "close failed");
}
H5MM_xfree(lf);
}
FUNC_LEAVE(NULL);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_read
*
* Purpose: Reads SIZE bytes of data beginning at address ADDR of the
* file LF and puts the result in BUF. Behavior when reading
* past the logical or physical end of file is to return zeros
* for that part of the request.
*
* This is only a virtual function; the subclass must define a
* read method or this function will fail.
*
* Errors:
* IO READERROR Read failed.
* IO UNSUPPORTED No read method.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
* June 2, 1998 Albert Cheng
* Added xfer_mode argument
*
*-------------------------------------------------------------------------
*/
herr_t
H5F_low_read(H5F_low_t *lf, const H5F_access_t *access_parms,
const H5D_transfer_t xfer_mode,
const haddr_t *addr, size_t size, uint8_t *buf/*out*/)
{
herr_t ret_value = FAIL;
FUNC_ENTER(H5F_low_read, FAIL);
assert(lf && lf->type);
assert(addr && addr_defined(addr));
assert(buf);
if (lf->type->read) {
if ((ret_value = (lf->type->read) (lf, access_parms, xfer_mode,
addr, size, buf)) < 0) {
HRETURN_ERROR(H5E_IO, H5E_READERROR, ret_value, "read failed");
}
} else {
HRETURN_ERROR(H5E_IO, H5E_UNSUPPORTED, FAIL, "no read method");
}
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_write
*
* Purpose: Writes SIZE bytes of data from BUF into the file LF beginning
* at address ADDR of the file. Writing past the logical or
* physical end of file causes the file to be extended.
*
* This is a virtual function only; if the subclass doesn't
* define a write method then this function will fail.
*
* Errors:
* IO UNSUPPORTED No write method.
* IO WRITEERROR Write failed.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
* June 2, 1998 Albert Cheng
* Added xfer_mode argument
*
* rky 980816
* Accommodate fancy MPI derived datatype writes.
*
* rky 980902
* For non-block parallel writes, don't change value of lf->eof.
*-------------------------------------------------------------------------
*/
herr_t
H5F_low_write(H5F_low_t *lf, const H5F_access_t *access_parms,
const H5D_transfer_t xfer_mode,
const haddr_t *addr, size_t size, const uint8_t *buf)
{
herr_t ret_value = FAIL;
haddr_t tmp_addr;
FUNC_ENTER(H5F_low_write, FAIL);
assert(lf && lf->type);
assert(addr && addr_defined(addr));
assert(buf);
/* check for writing past the end of file marker */
#ifdef HAVE_PARALLEL
if (H5F_LOW_MPIO==access_parms->driver &&
access_parms->u.mpio.use_types) {
/* rky 090902 KLUGE
* In the case of fancy use of MPI datatypes, the addr and size
* parameters have a very peculiar interpretation.
* It is logically possible, but quite complex, to calculate
* the physical offset that the last byte to be written will have
* (assuming the write doesn't fail partway thru, which it may).
* I don't yet fully understand the relationship between
* the lf->eof processor-local variable and the file's true eof.
* But presumably lf->eof has the correct value at this point,
* and we should _not_ change it,
* even if the file's true eof differs from the value of lf->eof.
* So for now we DO NOTHING!
* (Eventually, perhaps we should at least calculate the address
* of the last byte of this write, and compare it to lf->eof.) */
} else {
#endif /* HAVE_PARALLEL */
/* writing a simple block of bytes; can check for writing beyond eof */
tmp_addr = *addr;
H5F_addr_inc(&tmp_addr, (hsize_t)size);
if (H5F_addr_gt(&tmp_addr, &(lf->eof))) {
#ifdef H5F_DEBUG
if (H5DEBUG(F)) {
fprintf(H5DEBUG(F), "H5F: extending file w/o allocation\n");
}
#endif
lf->eof = tmp_addr;
}
#ifdef HAVE_PARALLEL
} /* end else */
#endif /* HAVE_PARALLEL */
/* Write the data */
if (lf->type->write) {
if ((ret_value = (lf->type->write) (lf, access_parms, xfer_mode,
addr, size, buf)) < 0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, ret_value, "write failed");
}
} else {
HRETURN_ERROR(H5E_IO, H5E_UNSUPPORTED, FAIL, "no write method");
}
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_flush
*
* Purpose: Flushes file buffers to disk. For instance, the stdio.h
* driver would call fflush(). Flushing also insures that the
* file exists to the current logical EOF (the library maintains
* a notion of EOF which is independent of the physical EOF) by
* reading and writing the last byte. On some systems, this
* allocates a single block at the end of the file while on
* other systems it allocates all blocks up to the end of the
* file. Extending the physical file is necessary because
* H5F_open() checks for truncated files.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Monday, November 10, 1997
*
* Modifications:
* rky 980828 Only p0 writes metadata to disk.
*
*-------------------------------------------------------------------------
*/
herr_t
H5F_low_flush(H5F_low_t *lf, const H5F_access_t *access_parms)
{
haddr_t last_byte;
uint8_t buf[1];
FUNC_ENTER(H5F_low_flush, FAIL);
assert(lf && lf->type);
/* Make sure the last block of the file has been allocated on disk */
/* rky 980828 NOTE
* Is this really necessary? Could this be eliminated for MPI-IO files? */
H5F_addr_reset(&last_byte);
if (addr_defined(&(lf->eof)) && H5F_addr_gt(&(lf->eof), &last_byte)) {
last_byte = lf->eof;
last_byte.offset -= 1;
if (H5F_low_read(lf, access_parms, H5D_XFER_DFLT, &last_byte,
1, buf) >= 0) {
#ifdef HAVE_PARALLEL
H5F_mpio_tas_allsame( lf, TRUE ); /* only p0 will write */
#endif /* HAVE_PARALLEL */
H5F_low_write(lf, access_parms, H5D_XFER_DFLT, &last_byte, 1, buf);
}
}
/* Invoke the subclass the flush method */
if (lf->type->flush) {
if ((lf->type->flush) (lf, access_parms) < 0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"low level flush failed");
}
}
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_size
*
* Purpose: Returns the current logical size of the file in bytes. This
* may differ from the physical size of the file (most
* subclasses extend the physical file size during the write
* operation instead of the alloc operation).
*
* The next absolute file address is returned through the
* EOF argument. This is the address of the logical end of
* file (that is, the address of the first byte past the last
* byte which is logically in the file).
*
* Warning: The return value type may not be large enough to represent
* the true size of the file. In such cases, the maximum
* possible size is returned. It is better to look at the EOF
* output argument to determine the total size.
*
* Errors:
* IO UNSUPPORTED No size method.
*
* Return: Success: Current size of file
*
* Failure: 0
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
hsize_t
H5F_low_size(H5F_low_t *lf, haddr_t *eof/*out*/)
{
hsize_t size = (hsize_t)(-1); /*max possible size */
FUNC_ENTER(H5F_low_size, 0);
assert(lf && lf->type);
assert(eof);
*eof = lf->eof;
if (eof->offset < size) size = eof->offset;
FUNC_LEAVE(size);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_access
*
* Purpose: Determines if a file can be accessed in a particular way by a
* particular subclass. The access modes for a file are the
* same as those of access(2), namely
*
* F_OK: determines if the file (or all parts of a multi-part
* file) exists.
*
* R_OK: determines if the file (or all parts of a multi-part
* file) are readable.
*
* W_OK: determines if the file (or all parts of a multi-part
* file) are writable.
*
* If a subclass doesn't define an access method, then we treat
* the name as if it were a local Unix file and test
* accessibility with the access(2) function. The KEY is
* returned as a device number and i-node pair.
*
* Return: Success: TRUE or FALSE. If TRUE, then KEY is
* initialized with data that makes this file
* unique (same value as H5F_low_open).
*
* Failure: FAIL, KEY is undefined.
*
* Programmer: Robb Matzke
* Friday, October 24, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
htri_t
H5F_low_access(const H5F_low_class_t *type, const char *name,
const H5F_access_t *access_parms, int mode,
H5F_search_t *key/*out*/)
{
htri_t ret_value;
struct stat sb;
FUNC_ENTER(H5F_low_size, FAIL);
assert(type);
if (type->access) {
ret_value = (type->access) (name, access_parms, mode, key /*out*/);
#ifdef WIN32
/*
this extra block is needed because windows sets the st_dev member of sb
to be 0 if it is a file which makes the comparison below wrong
*/
int fid;
fid=open(name,mode|_O_BINARY);
HDfstat(fid,&sb);
close(fid);
#else
HDstat(name, &sb);
#endif
} else {
ret_value = (0 == HDaccess(name, mode) ? TRUE : FALSE);
if (key) {
HDstat(name, &sb);
key->dev = sb.st_dev;
key->ino = sb.st_ino;
}
}
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_extend
*
* Purpose: Increases the logical size of a file by moving the logical
* end of file marker. A subclass can override this function by
* providing its own allocation method.
*
* Return: Success: Non-negative. The address of the old
* end-of-file is returned through the ADDR
* argument and the logical size of the file has
* been extended by SIZE bytes.
*
* Failure: Negative.
*
* Programmer: Robb Matzke
* Thursday, November 13, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5F_low_extend(H5F_low_t *lf, const H5F_access_t *access_parms, intn op,
hsize_t size, haddr_t *addr/*out*/)
{
FUNC_ENTER(H5F_low_alloc, FAIL);
assert(lf);
assert(size > 0);
assert(addr);
if (lf->type->extend) {
if ((lf->type->extend) (lf, access_parms, op, size, addr/*out*/) < 0) {
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
"unable to extend file");
}
} else {
*addr = lf->eof;
H5F_addr_inc(&(lf->eof), size);
}
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_alloc
*
* Purpose: Determines if a free block BLK can satisfy a request for SIZE
* bytes of memory from file F. If SIZE >= THRESH then the
* memory must be aligned on an ALIGN-byte boundary. Alignment
* is wrt the relative file addresses (that is, the size of the
* user-defined block at the beginning of the file is subtracted
* from the addresses before aligning them).
*
* Return: Success: Positive if the free block exactly satisfies
* the request; zero if the free block
* over-satisfies the request. In either case,
* ADDR will be the address within the free
* block where the request can be satisfied.
*
* Failure: Negative with the output value of ADDR undefined.
*
* Programmer: Robb Matzke
* Tuesday, June 9, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
intn
H5F_low_alloc (H5F_low_t *lf, intn op, hsize_t alignment, hsize_t threshold,
hsize_t size, H5MF_free_t *blk, haddr_t *addr/*out*/)
{
intn ret_value = FAIL;
hsize_t wasted;
FUNC_ENTER (H5F_low_alloc, FAIL);
assert (lf);
assert (alignment>0);
assert (size>0);
assert (blk);
assert (addr);
if (lf->type->alloc) {
ret_value = (lf->type->alloc)(lf, op, alignment, threshold, size, blk,
addr/*out*/);
} else {
if (size>=threshold) {
wasted = blk->addr.offset % alignment;
} else {
wasted = 0;
}
if (0==wasted && size==blk->size) {
/* exact match */
*addr = blk->addr;
ret_value = 1;
} else if (blk->size>wasted && blk->size-wasted>=size) {
/* over-satisfied */
*addr = blk->addr;
H5F_addr_inc (addr, wasted);
ret_value = 0;
}
}
FUNC_LEAVE (ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5F_low_seteof
*
* Purpose: Sets the logical end-of-file to the specified address.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Thursday, November 13, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5F_low_seteof(H5F_low_t *lf, const haddr_t *addr)
{
FUNC_ENTER(H5F_low_seteof, FAIL);
assert(lf);
assert(addr && addr_defined(addr));
lf->eof = *addr;
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_cmp
*
* Purpose: Compares two addresses.
*
* Return: Success: <0 if A1<A2
* =0 if A1=A2
* >0 if A1>A2
*
* Failure: never fails
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
intn
H5F_addr_cmp(const haddr_t *a1, const haddr_t *a2)
{
FUNC_ENTER(H5F_addr_cmp, FAIL);
assert(a1 && addr_defined(a1));
assert(a2 && addr_defined(a2));
if (a1->offset < a2->offset)
HRETURN(-1);
if (a1->offset > a2->offset)
HRETURN(1);
FUNC_LEAVE(0);
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_undef
*
* Purpose: Cause an address to become undefined.
*
* Return: void
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_undef(haddr_t *addr/*out*/)
{
assert(addr);
addr->offset = (uint64_t)(-1);
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_defined
*
* Purpose: Determines if an address has a defined value.
*
* Return: Success: TRUE or FALSE
*
* Failure: FAIL
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
htri_t
H5F_addr_defined(const haddr_t *addr)
{
FUNC_ENTER(H5F_addr_defined, FAIL);
FUNC_LEAVE(addr_defined(addr));
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_reset
*
* Purpose: Reset the address to zero.
*
* Return: void
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_reset(haddr_t *addr/*out*/)
{
assert(addr);
addr->offset = 0;
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_zerop
*
* Purpose: Determines if an address is zero.
*
* Return: Success: TRUE or FALSE
*
* Failure: FAIL
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
htri_t
H5F_addr_zerop(const haddr_t *addr)
{
FUNC_ENTER(H5F_addr_zerop, FAIL);
FUNC_LEAVE(0 == addr->offset ? TRUE : FALSE);
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_encode
*
* Purpose: Encodes an address into the buffer pointed to by *PP and
* then increments the pointer to the first byte after the
* address. An undefined value is stored as all 1's.
*
* Return: void
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_encode(H5F_t *f, uint8_t **pp, const haddr_t *addr)
{
uintn i;
haddr_t tmp;
assert(f);
assert(pp && *pp);
assert(addr);
if (addr_defined(addr)) {
tmp = *addr;
for (i=0; i<H5F_SIZEOF_ADDR(f); i++) {
*(*pp)++ = (uint8_t)(tmp.offset & 0xff);
tmp.offset >>= 8;
}
assert("overflow" && 0 == tmp.offset);
} else {
for (i=0; i<H5F_SIZEOF_ADDR(f); i++) {
*(*pp)++ = 0xff;
}
}
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_decode
*
* Purpose: Decodes an address from the buffer pointed to by *PP and
* updates the pointer to point to the next byte after the
* address.
*
* If the value read is all 1's then the address is returned
* with an undefined value.
*
* Return: void
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_decode(H5F_t *f, const uint8_t **pp, haddr_t *addr/*out*/)
{
uintn i;
haddr_t tmp;
uint8_t c;
hbool_t all_zero = TRUE;
assert(f);
assert(pp && *pp);
assert(addr);
addr->offset = 0;
for (i=0; i<H5F_SIZEOF_ADDR(f); i++) {
c = *(*pp)++;
if (c != 0xff) all_zero = FALSE;
if (i<sizeof(addr->offset)) {
tmp.offset = c;
tmp.offset <<= i * 8; /*use tmp to get casting right */
addr->offset |= tmp.offset;
} else if (!all_zero) {
assert(0 == **pp); /*overflow */
}
}
if (all_zero) H5F_addr_undef(addr);
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_print
*
* Purpose: Print an address
*
* Return: void
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_print(FILE *stream, const haddr_t *addr)
{
assert(stream);
assert(addr);
HDfprintf(stream, "%a", addr);
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_pow2
*
* Purpose: Returns an address which is a power of two.
*
* Return: void
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_pow2(uintn n, haddr_t *addr /*out */ )
{
assert(addr);
assert(n < 8 * sizeof(addr->offset));
addr->offset = 1;
addr->offset <<= n;
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_inc
*
* Purpose: Increments an address by some number of bytes.
*
* Return: void
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_inc(haddr_t *addr/*in,out*/, hsize_t inc)
{
assert(addr && addr_defined(addr));
assert(addr->offset <= addr->offset + inc);
addr->offset += inc;
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_adj
*
* Purpose: Adjusts an address by adding or subtracting some amount.
*
* Return: void
*
* Programmer: Robb Matzke
* Monday, April 6, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_adj(haddr_t *addr/*in,out */, hssize_t adj)
{
#ifndef NDEBUG
assert(addr && addr_defined(addr));
if (adj>=0) {
assert(addr->offset <= addr->offset + adj);
} else {
assert (addr->offset > addr->offset + adj);
}
#endif
addr->offset += adj;
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_add
*
* Purpose: Adds two addresses and puts the result in the first argument.
*
* Return: void
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
void
H5F_addr_add(haddr_t *a1 /*in,out */ , const haddr_t *a2)
{
assert(a1 && addr_defined(a1));
assert(a2 && addr_defined(a2));
a1->offset += a2->offset;
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_hash
*
* Purpose: Computes a hash value of an address between 0 and MOD-1,
* inclusive.
*
* Return: Success: The hash value
*
* Failure: never fails
*
* Programmer: Robb Matzke
* Friday, November 7, 1997
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
uintn
H5F_addr_hash(const haddr_t *addr, uintn mod)
{
assert(addr && addr_defined(addr));
assert(mod > 0);
return (unsigned)(addr->offset % mod); /*ignore file number */
}
/*-------------------------------------------------------------------------
* Function: H5F_addr_pack
*
* Purpose: Converts a long[2] array (usually returned from H5G_get_objinfo)
* back into a haddr_t
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* Tuesday, October 23, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5F_addr_pack(H5F_t __unused__ *f, haddr_t *addr, const long objno[2])
{
assert(f);
assert(objno);
assert(addr);
addr->offset=objno[0];
addr->offset|=((uint64_t)objno[1])<<(8*sizeof(long));
return(SUCCEED);
}
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