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/*
* Copyright (C) 2000-2001 NCSA
* All rights reserved.
*
* Programmer: Quincey Koziol <koziol@ncsa.uiuc.edu>
* Thursday, September 28, 2000
*
* Purpose: Contiguous dataset I/O functions. These routines are similar
* to the H5F_istore_* routines and really only abstract away dealing
* with the data sieve buffer from the H5F_arr_read/write and
* H5F_seg_read/write.
*
*/
#define H5F_PACKAGE /*suppress error about including H5Fpkg */
#include "H5private.h"
#include "H5Eprivate.h"
#include "H5Fpkg.h"
#include "H5FDprivate.h" /*file driver */
#include "H5MMprivate.h"
/* Interface initialization */
#define PABLO_MASK H5Fcontig_mask
static intn interface_initialize_g = 0;
#define INTERFACE_INIT NULL
/*-------------------------------------------------------------------------
* Function: H5F_contig_read
*
* Purpose: Reads some data from a dataset into a buffer.
* The data is contiguous. The address is relative to the base
* address for the file.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* Thursday, September 28, 2000
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5F_contig_read(H5F_t *f, hsize_t max_data, H5FD_mem_t type, haddr_t addr, hsize_t size, hid_t dxpl_id,
void *buf/*out*/)
{
haddr_t abs_eoa; /* Absolute end of file address */
haddr_t rel_eoa; /* Relative end of file address */
FUNC_ENTER(H5F_contig_read, FAIL);
/* Check args */
assert(f);
assert(size<SIZET_MAX);
assert(buf);
/* Check if data sieving is enabled */
if(f->shared->lf->feature_flags&H5FD_FEAT_DATA_SIEVE) {
/* Try reading from the data sieve buffer */
if(f->shared->sieve_buf) {
haddr_t sieve_start, sieve_end; /* Start & end locations of sieve buffer */
haddr_t contig_end; /* End locations of block to write */
hsize_t sieve_size; /* size of sieve buffer */
/* Stash local copies of these value */
sieve_start=f->shared->sieve_loc;
sieve_size=f->shared->sieve_size;
sieve_end=sieve_start+sieve_size;
contig_end=addr+size-1;
/* If entire read is within the sieve buffer, read it from the buffer */
if(addr>=sieve_start && contig_end<sieve_end) {
/* Grab the data out of the buffer */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemcpy(buf,f->shared->sieve_buf+(addr-sieve_start),(size_t)size);
} /* end if */
/* Entire request is not within this data sieve buffer */
else {
/* Check if we can actually hold the I/O request in the sieve buffer */
if(size>f->shared->sieve_buf_size) {
/* Check for any overlap with the current sieve buffer */
if((sieve_start>=addr && sieve_start<(contig_end+1))
|| ((sieve_end-1)>=addr && (sieve_end-1)<(contig_end+1))) {
/* Flush the sieve buffer, if it's dirty */
if(f->shared->sieve_dirty) {
/* Write to file */
if (H5F_block_write(f, H5FD_MEM_DRAW, sieve_start, sieve_size, dxpl_id, f->shared->sieve_buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"block write failed");
}
/* Reset sieve buffer dirty flag */
f->shared->sieve_dirty=0;
} /* end if */
} /* end if */
/* Read directly into the user's buffer */
if (H5F_block_read(f, type, addr, size, dxpl_id, buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL,
"block read failed");
}
} /* end if */
/* Element size fits within the buffer size */
else {
/* Flush the sieve buffer if it's dirty */
if(f->shared->sieve_dirty) {
/* Write to file */
if (H5F_block_write(f, H5FD_MEM_DRAW, sieve_start, sieve_size, dxpl_id, f->shared->sieve_buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"block write failed");
}
/* Reset sieve buffer dirty flag */
f->shared->sieve_dirty=0;
} /* end if */
/* Determine the new sieve buffer size & location */
f->shared->sieve_loc=addr;
/* Make certain we don't read off the end of the file */
if (HADDR_UNDEF==(abs_eoa=H5FD_get_eoa(f->shared->lf))) {
HRETURN_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL,
"unable to determine file size");
}
/* Adjust absolute EOA address to relative EOA address */
rel_eoa=abs_eoa-f->shared->base_addr;
/* Compute the size of the sieve buffer */
f->shared->sieve_size=MIN(rel_eoa-addr,MIN(max_data,f->shared->sieve_buf_size));
/* Read the new sieve buffer */
if (H5F_block_read(f, type, f->shared->sieve_loc, f->shared->sieve_size, dxpl_id, f->shared->sieve_buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL,
"block read failed");
}
/* Reset sieve buffer dirty flag */
f->shared->sieve_dirty=0;
/* Grab the data out of the buffer (must be first piece of data in buffer ) */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemcpy(buf,f->shared->sieve_buf,(size_t)size);
} /* end else */
} /* end else */
} /* end if */
/* No data sieve buffer yet, go allocate one */
else {
/* Check if we can actually hold the I/O request in the sieve buffer */
if(size>f->shared->sieve_buf_size) {
if (H5F_block_read(f, type, addr, size, dxpl_id, buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL,
"block read failed");
}
} /* end if */
else {
/* Allocate room for the data sieve buffer */
assert(f->shared->sieve_buf_size==(hsize_t)((size_t)f->shared->sieve_buf_size)); /*check for overflow*/
if (NULL==(f->shared->sieve_buf=H5MM_malloc((size_t)f->shared->sieve_buf_size))) {
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
"memory allocation failed");
}
/* Determine the new sieve buffer size & location */
f->shared->sieve_loc=addr;
/* Make certain we don't read off the end of the file */
if (HADDR_UNDEF==(abs_eoa=H5FD_get_eoa(f->shared->lf))) {
HRETURN_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL,
"unable to determine file size");
}
/* Adjust absolute EOA address to relative EOA address */
rel_eoa=abs_eoa-f->shared->base_addr;
/* Compute the size of the sieve buffer */
f->shared->sieve_size=MIN(rel_eoa-addr,MIN(max_data,f->shared->sieve_buf_size));
/* Read the new sieve buffer */
if (H5F_block_read(f, type, f->shared->sieve_loc, f->shared->sieve_size, dxpl_id, f->shared->sieve_buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL,
"block read failed");
}
/* Reset sieve buffer dirty flag */
f->shared->sieve_dirty=0;
/* Grab the data out of the buffer (must be first piece of data in buffer ) */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemcpy(buf,f->shared->sieve_buf,(size_t)size);
} /* end else */
} /* end else */
} /* end if */
else {
if (H5F_block_read(f, type, addr, size, dxpl_id, buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL,
"block read failed");
}
} /* end else */
FUNC_LEAVE(SUCCEED);
} /* End H5F_contig_read() */
/*-------------------------------------------------------------------------
* Function: H5F_contig_write
*
* Purpose: Writes some data from a dataset into a buffer.
* The data is contiguous. The address is relative to the base
* address for the file.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* Thursday, September 28, 2000
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5F_contig_write(H5F_t *f, hsize_t max_data, H5FD_mem_t type, haddr_t addr, hsize_t size,
hid_t dxpl_id, const void *buf)
{
haddr_t abs_eoa; /* Absolute end of file address */
haddr_t rel_eoa; /* Relative end of file address */
FUNC_ENTER(H5F_contig_write, FAIL);
assert (f);
assert (size<SIZET_MAX);
assert (buf);
/* Check if data sieving is enabled */
if(f->shared->lf->feature_flags&H5FD_FEAT_DATA_SIEVE) {
/* Try writing to the data sieve buffer */
if(f->shared->sieve_buf) {
haddr_t sieve_start, sieve_end; /* Start & end locations of sieve buffer */
haddr_t contig_end; /* End locations of block to write */
hsize_t sieve_size; /* size of sieve buffer */
/* Stash local copies of these value */
sieve_start=f->shared->sieve_loc;
sieve_size=f->shared->sieve_size;
sieve_end=sieve_start+sieve_size;
contig_end=addr+size-1;
/* If entire write is within the sieve buffer, write it to the buffer */
if(addr>=sieve_start && contig_end<sieve_end) {
/* Grab the data out of the buffer */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemcpy(f->shared->sieve_buf+(addr-sieve_start),buf,(size_t)size);
/* Set sieve buffer dirty flag */
f->shared->sieve_dirty=1;
} /* end if */
/* Entire request is not within this data sieve buffer */
else {
/* Check if we can actually hold the I/O request in the sieve buffer */
if(size>f->shared->sieve_buf_size) {
/* Check for any overlap with the current sieve buffer */
if((sieve_start>=addr && sieve_start<(contig_end+1))
|| ((sieve_end-1)>=addr && (sieve_end-1)<(contig_end+1))) {
/* Flush the sieve buffer, if it's dirty */
if(f->shared->sieve_dirty) {
/* Write to file */
if (H5F_block_write(f, H5FD_MEM_DRAW, sieve_start, sieve_size, dxpl_id, f->shared->sieve_buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"block write failed");
}
/* Reset sieve buffer dirty flag */
f->shared->sieve_dirty=0;
} /* end if */
/* Force the sieve buffer to be re-read the next time */
f->shared->sieve_loc=HADDR_UNDEF;
f->shared->sieve_size=0;
} /* end if */
/* Write directly to the user's buffer */
if (H5F_block_write(f, type, addr, size, dxpl_id, buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"block write failed");
} /* end if */
} /* end if */
/* Element size fits within the buffer size */
else {
/* Check if it is possible to (exactly) prepend or append to existing (dirty) sieve buffer */
if(((addr+size)==sieve_start || addr==sieve_end) &&
(size+sieve_size)<=f->shared->sieve_buf_size &&
f->shared->sieve_dirty) {
/* Prepend to existing sieve buffer */
if((addr+size)==sieve_start) {
/* Move existing sieve information to correct location */
assert(sieve_size==(hsize_t)((size_t)sieve_size)); /*check for overflow*/
HDmemmove(f->shared->sieve_buf+size,f->shared->sieve_buf,(size_t)sieve_size);
/* Copy in new information (must be first in sieve buffer) */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemcpy(f->shared->sieve_buf,buf,(size_t)size);
/* Adjust sieve location */
f->shared->sieve_loc=addr;
} /* end if */
/* Append to existing sieve buffer */
else {
/* Copy in new information */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemcpy(f->shared->sieve_buf+sieve_size,buf,(size_t)size);
} /* end else */
/* Adjust sieve size */
f->shared->sieve_size += size;
} /* end if */
/* Can't add the new data onto the existing sieve buffer */
else {
/* Flush the sieve buffer if it's dirty */
if(f->shared->sieve_dirty) {
/* Write to file */
if (H5F_block_write(f, H5FD_MEM_DRAW, sieve_start, sieve_size, dxpl_id, f->shared->sieve_buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"block write failed");
} /* end if */
/* Reset sieve buffer dirty flag */
f->shared->sieve_dirty=0;
} /* end if */
/* Determine the new sieve buffer size & location */
f->shared->sieve_loc=addr;
/* Make certain we don't read off the end of the file */
if (HADDR_UNDEF==(abs_eoa=H5FD_get_eoa(f->shared->lf))) {
HRETURN_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL,
"unable to determine file size");
} /* end if */
/* Adjust absolute EOA address to relative EOA address */
rel_eoa=abs_eoa-f->shared->base_addr;
/* Compute the size of the sieve buffer */
f->shared->sieve_size=MIN(rel_eoa-addr,MIN(max_data,f->shared->sieve_buf_size));
/* Check if there is any point in reading the data from the file */
if(f->shared->sieve_size>size) {
/* Read the new sieve buffer */
if (H5F_block_read(f, type, f->shared->sieve_loc, f->shared->sieve_size, dxpl_id, f->shared->sieve_buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL,
"block read failed");
} /* end if */
} /* end if */
/* Grab the data out of the buffer (must be first piece of data in buffer) */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemcpy(f->shared->sieve_buf,buf,(size_t)size);
/* Set sieve buffer dirty flag */
f->shared->sieve_dirty=1;
} /* end else */
} /* end else */
} /* end else */
} /* end if */
/* No data sieve buffer yet, go allocate one */
else {
/* Check if we can actually hold the I/O request in the sieve buffer */
if(size>f->shared->sieve_buf_size) {
if (H5F_block_write(f, type, addr, size, dxpl_id, buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"block write failed");
}
} /* end if */
else {
/* Allocate room for the data sieve buffer */
assert(f->shared->sieve_buf_size==(hsize_t)((size_t)f->shared->sieve_buf_size)); /*check for overflow*/
if (NULL==(f->shared->sieve_buf=H5MM_malloc((size_t)f->shared->sieve_buf_size))) {
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
"memory allocation failed");
} /* end if */
/* Determine the new sieve buffer size & location */
f->shared->sieve_loc=addr;
/* Make certain we don't read off the end of the file */
if (HADDR_UNDEF==(abs_eoa=H5FD_get_eoa(f->shared->lf))) {
HRETURN_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL,
"unable to determine file size");
} /* end if */
/* Adjust absolute EOA address to relative EOA address */
rel_eoa=abs_eoa-f->shared->base_addr;
/* Compute the size of the sieve buffer */
f->shared->sieve_size=MIN(rel_eoa-addr,MIN(max_data,f->shared->sieve_buf_size));
/* Check if there is any point in reading the data from the file */
if(f->shared->sieve_size>size) {
/* Read the new sieve buffer */
if (H5F_block_read(f, type, f->shared->sieve_loc, f->shared->sieve_size, dxpl_id, f->shared->sieve_buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL,
"block read failed");
} /* end if */
} /* end if */
/* Grab the data out of the buffer (must be first piece of data in buffer) */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemcpy(f->shared->sieve_buf,buf,(size_t)size);
/* Set sieve buffer dirty flag */
f->shared->sieve_dirty=1;
} /* end else */
} /* end else */
} /* end if */
else {
if (H5F_block_write(f, type, addr, size, dxpl_id, buf)<0) {
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"block write failed");
} /* end if */
} /* end else */
FUNC_LEAVE(SUCCEED);
} /* End H5F_contig_write() */
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