02be089f0c
New Feature
Description:
Added support for the lock and unlock function calls for file
drivers. Only FPHDF5 uses this feature. All of these drivers don't
define lock or unlock methods.
Platforms tested:
Linux, Modi4, Sol
Misc. update:
820 lines
25 KiB
C
820 lines
25 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the files COPYING and Copyright.html. COPYING can be found at the root *
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* of the source code distribution tree; Copyright.html can be found at the *
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* root level of an installed copy of the electronic HDF5 document set and *
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* is linked from the top-level documents page. It can also be found at *
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* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
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* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/*
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* Programmer: Saurabh Bagchi (bagchi@uiuc.edu)
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* Thursday, August 12 -Tuesday, August 17, 1999
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*
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* Purpose: This is the GASS I/O driver.
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*
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*/
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#include "H5private.h" /*library functions */
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#include "H5Eprivate.h" /*error handling */
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#include "H5Fprivate.h" /*files */
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#include "H5FDprivate.h" /*file driver */
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#include "H5FDgass.h" /* Core file driver */
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#include "H5Iprivate.h" /*object IDs */
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#include "H5MMprivate.h" /* Memory allocation */
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#include "H5Pprivate.h" /*property lists */
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#ifdef H5_HAVE_GASS
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/* The driver identification number, initialized at runtime */
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static hid_t H5FD_GASS_g = 0;
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/* File operations */
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#define OP_UNKNOWN 0
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#define OP_READ 1
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#define OP_WRITE 2
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/*
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* The description of a file belonging to this driver. The `eoa' and `eof'
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* determine the amount of hdf5 address space in use and the high-water mark
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* of the file (the current size of the underlying Unix file). The `pos'
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* value is used to eliminate file position updates when they would be a
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* no-op. Unfortunately we've found systems that use separate file position
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* indicators for reading and writing so the lseek can only be eliminated if
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* the current operation is the same as the previous operation. When opening
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* a file the `eof' will be set to the current file size, `eoa' will be set
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* to zero, `pos' will be set to H5F_ADDR_UNDEF (as it is when an error
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* occurs), and `op' will be set to H5F_OP_UNKNOWN.
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*/
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typedef struct H5FD_gass_t {
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H5FD_t pub; /*public stuff, must be first */
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int fd; /*the unix file */
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GASS_Info info; /*file information */
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haddr_t eoa; /*end of allocated region */
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haddr_t eof; /*end of file; current file size*/
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haddr_t pos; /*current file I/O position */
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int op; /*last operation */
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} H5FD_gass_t;
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/*
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* This driver supports systems that have the lseek64() function by defining
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* some macros here so we don't have to have conditional compilations later
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* throughout the code.
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*
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* file_offset_t: The datatype for file offsets, the second argument of
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* the lseek() or lseek64() call.
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*
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* file_seek: The function which adjusts the current file position,
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* either lseek() or lseek64().
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*/
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/* adding for windows NT file system support. */
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#ifdef H5_HAVE_LSEEK64
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# define file_offset_t off64_t
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# define file_seek lseek64
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#elif defined (WIN32)
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# ifdef __MWERKS__
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# define file_offset_t off_t
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# define file_seek lseek
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# else /*MSVC*/
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# define file_offset_t __int64
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# define file_seek _lseeki64
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# endif
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#else
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# define file_offset_t off_t
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# define file_seek lseek
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#endif
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/*
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* These macros check for overflow of various quantities. These macros
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* assume that file_offset_t is signed and haddr_t and size_t are unsigned.
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*
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* ADDR_OVERFLOW: Checks whether a file address of type `haddr_t'
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* is too large to be represented by the second argument
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* of the file seek function.
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*
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* SIZE_OVERFLOW: Checks whether a buffer size of type `hsize_t' is too
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* large to be represented by the `size_t' type.
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*
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* REGION_OVERFLOW: Checks whether an address and size pair describe data
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* which can be addressed entirely by the second
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* argument of the file seek function.
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*/
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#define MAXADDR (((haddr_t)1<<(8*sizeof(file_offset_t)-1))-1)
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#define ADDR_OVERFLOW(A) (HADDR_UNDEF==(A) || \
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((A) & ~(haddr_t)MAXADDR))
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#define SIZE_OVERFLOW(Z) ((Z) & ~(hsize_t)MAXADDR)
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#define REGION_OVERFLOW(A,Z) (ADDR_OVERFLOW(A) || SIZE_OVERFLOW(Z) || \
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sizeof(file_offset_t)<sizeof(size_t) || \
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HADDR_UNDEF==(A)+(Z) || \
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(file_offset_t)((A)+(Z))<(file_offset_t)(A))
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/* Prototypes */
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static H5FD_t *H5FD_gass_open(const char *name, unsigned flags, hid_t fapl_id,
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haddr_t maxaddr);
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static herr_t H5FD_gass_close(H5FD_t *_file);
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static herr_t H5FD_gass_query(const H5FD_t *_f1, unsigned long *flags);
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static haddr_t H5FD_gass_get_eoa(H5FD_t *_file);
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static herr_t H5FD_gass_set_eoa(H5FD_t *_file, haddr_t addr);
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static haddr_t H5FD_gass_get_eof(H5FD_t *_file);
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static herr_t H5FD_gass_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle);
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static herr_t H5FD_gass_read(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
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size_t size, void *buf);
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static herr_t H5FD_gass_write(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
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size_t size, const void *buf);
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/* GASS I/O-specific file access properties */
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typedef struct H5FD_gass_fapl_t {
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GASS_Info info; /* access property parameters */
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} H5FD_gass_fapl_t;
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/* The GASS IO driver information */
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static const H5FD_class_t H5FD_gass_g = {
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"gass", /*name */
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MAXADDR, /*maxaddr */
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H5F_CLOSE_WEAK, /* fc_degree */
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NULL, /*sb_size */
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NULL, /*sb_encode */
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NULL, /*sb_decode */
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sizeof(H5FD_gass_fapl_t), /*fapl_size */
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NULL, /*fapl_get */
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NULL, /*fapl_copy */
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NULL, /*fapl_free */
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0, /*dxpl_size */
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NULL, /*dxpl_copy */
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NULL, /*dxpl_free */
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H5FD_gass_open, /*open */
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H5FD_gass_close, /*close */
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NULL, /*cmp */
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H5FD_gass_query, /*query */
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NULL, /*alloc */
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NULL, /*free */
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H5FD_gass_get_eoa, /*get_eoa */
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H5FD_gass_set_eoa, /*set_eoa */
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H5FD_gass_get_eof, /*get_eof */
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H5FD_gass_get_handle, /*get_handle */
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H5FD_gass_read, /*read */
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H5FD_gass_write, /*write */
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NULL, /*flush */
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NULL, /*lock */
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NULL, /*unlock */
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H5FD_FLMAP_SINGLE /*fl_map */
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};
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/* Interface initialization */
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#define PABLO_MASK H5FD_gass_mask
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#define INTERFACE_INIT H5FD_gass_init
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static int interface_initialize_g = 0;
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/*-------------------------------------------------------------------------
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* Function: H5FD_gass_init
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*
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* Purpose: Initialize this driver by registering the driver with the
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* library.
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*
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* Return: Success: The driver ID for the gass driver.
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*
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* Failure: Negative.
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*
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* Programmer: Saurabh Bagchi
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* Friday, August 13, 1999
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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hid_t
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H5FD_gass_init(void)
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{
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hid_t ret_value=H5FD_GASS_g; /* Return value */
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FUNC_ENTER_NOAPI(H5FD_gass_init, FAIL);
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if (!H5FD_GASS_g)
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H5FD_GASS_g = H5FDregister(&H5FD_gass_g);
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globus_module_activate (GLOBUS_COMMON_MODULE);
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globus_module_activate (GLOBUS_GASS_FILE_MODULE);
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/* Set return value */
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ret_value=H5FD_GASS_g;
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done:
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FUNC_LEAVE_NOAPI(ret_value);
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}
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/*-------------------------------------------------------------------------
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* Function: H5Pset_fapl_gass
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*
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* Purpose: Store the user supplied GASS INFO in
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* the file access property list FAPL_ID which can then be used
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* to create and/or open the file.
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*
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* GASS info object to be used for file open using GASS.
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* Any modification to info after
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* this function call returns may have undetermined effect
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* to the access property list. Users should call this
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* function again to setup the property list.
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*
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*
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* Return: Success: Non-negative
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*
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* Failure: Negative
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*
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* Programmer: Saurabh Bagchi
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* Friday, August 13, 1999
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*
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* Modifications:
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*
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* Raymond Lu, 2001-10-25
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* Changed the file access list to the new generic property list.
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*
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*-------------------------------------------------------------------------
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*/
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herr_t
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H5Pset_fapl_gass(hid_t fapl_id, GASS_Info info)
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{
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H5FD_gass_fapl_t fa;
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H5P_genplist_t *plist; /* Property list pointer */
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herr_t ret_value;
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FUNC_ENTER_API(H5Pset_fapl_gass, FAIL);
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/*NO TRACE*/
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/* Check arguments */
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if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
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HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list");
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#ifdef LATER
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#warning "We need to verify that INFO contain sensible information."
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#endif
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/* Initialize driver specific properties */
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fa.info = info;
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ret_value= H5P_set_driver(plist, H5FD_GASS, &fa);
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done:
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FUNC_LEAVE_API(ret_value);
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}
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/*-------------------------------------------------------------------------
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* Function: H5Pget_fapl_gass
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*
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* Purpose: If the file access property list is set to the H5FD_GASS
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* driver then this function returns the GASS info object
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* through the INFO pointer.
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*
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* Return: Success: Non-negative with the info object returned
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* through the INFO arguments if non-null.
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* The information is copied and it is therefore
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* valid only until the file access property
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* list is modified or closed.
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*
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* Failure: Negative
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*
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* Programmer: Saurabh Bagchi
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* Friday, August 13, 1999
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*
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* Modifications:
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*
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* Raymond Lu, 2001-10-25
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* Changed the file access list to the new generic property list.
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*
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*-------------------------------------------------------------------------
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*/
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herr_t
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H5Pget_fapl_gass(hid_t fapl_id, GASS_Info *info/*out*/)
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{
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H5FD_gass_fapl_t *fa;
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H5P_genplist_t *plist; /* Property list pointer */
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herr_t ret_value=SUCCEED; /* Return value */
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FUNC_ENTER_API(H5Pget_fapl_gass, FAIL);
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H5TRACE2("e","ix",fapl_id,info);
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if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
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HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list");
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if (H5FD_GASS!=H5P_get_driver(plist))
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HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "incorrect VFL driver");
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if (NULL==(fa=H5P_get_driver_info(plist)))
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HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "bad VFL driver info");
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if (info)
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*info = fa->info;
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done:
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FUNC_LEAVE_API(ret_value);
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}
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/*-------------------------------------------------------------------------
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* Function: H5FD_gass_open
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*
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* Purpose: Opens a file with name NAME. The FLAGS are a bit field with
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* purpose similar to the second argument of open(2) and which
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* are defined in H5Fpublic.h. The file access property list
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* FAPL_ID contains the driver properties and MAXADDR
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* is the largest address which this file will be expected to
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* access.
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*
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* Return: Success: A pointer to a new file data structure. The
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* public fields will be initialized by the
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* caller, which is always H5FD_open().
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*
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* Failure: NULL
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*
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* Programmer: Saurabh Bagchi
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* Friday, August 13, 1999
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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static H5FD_t *
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H5FD_gass_open(const char *name, unsigned flags, hid_t fapl_id,
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haddr_t maxaddr)
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{
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int fd;
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H5FD_gass_t *file=NULL;
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const H5FD_gass_fapl_t *fa=NULL;
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H5FD_gass_fapl_t _fa;
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char *filename = (char *) H5MM_malloc(80 * sizeof(char));
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H5P_genplist_t *plist; /* Property list pointer */
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h5_stat_t sb;
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H5FD_t *ret_value;
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FUNC_ENTER_NOAPI(H5FD_gass_open, NULL);
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/* fprintf(stdout, "Entering H5FD_gass_open name=%s flags=0x%x\n", name, flags); */
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/* Check arguments */
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if (!name || !*name)
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HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid file name");
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if (0==maxaddr || HADDR_UNDEF==maxaddr)
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HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr");
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if (ADDR_OVERFLOW(maxaddr))
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HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr");
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strcpy (filename, name);
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/* Obtain a pointer to gass-specific file access properties */
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if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
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HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file access property list");
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if (H5P_FILE_ACCESS_DEFAULT==fapl_id || H5FD_GASS!=H5P_get_driver(plist)) {
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GASS_INFO_NULL (_fa.info);
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/* _fa.info = GASS_INFO_NULL; */
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/* _fa.info = {0,0}; */ /*default*/
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fa = &_fa;
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} else {
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fa = H5P_get_driver_info(plist);
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assert(fa);
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}
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/* When I come down here, the possible flag values and the correct
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responses are given here :-
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1. H5F_ACC_CREAT | H5F_ACC_RDWR | H5F_ACC_EXCL : The file is
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a new one. Go ahead and open it in O_RDWR.
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2. H5F_ACC_CREAT | H5F_ACC_RDWR | H5F_ACC_TRUNC : Use
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O_RDWR | O_TRUNC with gass_open.
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3. H5F_ACC_RDWR | H5F_ACC_TRUNC : File already exists. Truncate it.
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4. H5F_ACC_RDWR : Use O_RDWR with gass_open
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5. H5F_ACC_RDWR is not set : Use O_RDONLY with gass_open
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One reason why we cannot simply pass on the flags to gass_open
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is that gass_open does not support many of them (e.g., O_CREAT)
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*/
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if ((flags & H5F_ACC_CREAT) && (flags & H5F_ACC_RDWR) && (flags & H5F_ACC_EXCL)) {
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if ((fd = globus_gass_open (filename, O_RDWR|O_TRUNC)) < 0)
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HGOTO_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed");
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}
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else if ((flags & H5F_ACC_CREAT) && (flags & H5F_ACC_RDWR) && (flags & H5F_ACC_TRUNC)) {
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if ((fd = globus_gass_open (filename, O_RDWR|O_TRUNC)) < 0)
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HGOTO_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed");
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}
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else if ((flags & H5F_ACC_RDWR) && (flags & H5F_ACC_TRUNC)) {
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if ((fd = globus_gass_open (filename, O_RDWR|O_TRUNC)) < 0)
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HGOTO_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed");
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}
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else if (flags & H5F_ACC_RDWR) {
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if ((fd = globus_gass_open (filename, O_RDWR)) < 0)
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HGOTO_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed");
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}
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else { /* This is case where H5F_ACC_RDWR is not set */
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if ((fd = globus_gass_open (filename, O_RDONLY)) < 0)
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HGOTO_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed");
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}
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if (HDfstat(fd, &sb)<0) {
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close(fd);
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HGOTO_ERROR(H5E_IO, H5E_BADFILE, NULL, "fstat failed");
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}
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/* Create the new file struct */
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if (NULL==(file=H5MM_calloc(sizeof(H5FD_gass_t))))
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HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "can't allocate file struct");
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file->fd = fd;
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file->eof = sb.st_size;
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file->pos = HADDR_UNDEF;
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file->op = OP_UNKNOWN;
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file->info = fa->info;
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/* Set return value */
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ret_value=(H5FD_t*)file;
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done:
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FUNC_LEAVE_NOAPI(ret_value);
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}
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/*-------------------------------------------------------------------------
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||
* Function: H5FD_gass_close
|
||
*
|
||
* Purpose: Closes a GASS file.
|
||
*
|
||
* Return: Success: 0
|
||
*
|
||
* Failure: -1, file not closed.
|
||
*
|
||
* Programmer: Saurabh Bagchi
|
||
* Monday, August 16, 1999
|
||
*
|
||
* Modifications:
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
static herr_t
|
||
H5FD_gass_close (H5FD_t *_file)
|
||
{
|
||
H5FD_gass_t *file = (H5FD_gass_t *)_file;
|
||
herr_t ret_value=SUCCEED; /* Return value */
|
||
|
||
FUNC_ENTER_NOAPI(H5FD_gass_close, FAIL);
|
||
|
||
if (file == NULL)
|
||
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid file handle");
|
||
|
||
if (globus_gass_close (file->fd) < 0)
|
||
HGOTO_ERROR(H5E_IO, H5E_CANTCLOSEFILE, FAIL, "can't close GASS file");
|
||
|
||
H5MM_xfree(file);
|
||
|
||
done:
|
||
FUNC_LEAVE_NOAPI(ret_value);
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
* Function: H5FD_gass_query
|
||
*
|
||
* Purpose: Set the flags that this VFL driver is capable of supporting.
|
||
* (listed in H5FDpublic.h)
|
||
*
|
||
* Return: Success: non-negative
|
||
*
|
||
* Failure: negative
|
||
*
|
||
* Programmer: Quincey Koziol
|
||
* Tuesday, September 26, 2000
|
||
*
|
||
* Modifications:
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
static herr_t
|
||
H5FD_gass_query(const UNUSED H5FD_t *_f, unsigned long *flags /* out */)
|
||
{
|
||
herr_t ret_value=SUCCEED;
|
||
|
||
FUNC_ENTER_NOAPI(H5FD_gass_query, FAIL);
|
||
|
||
/* Set the VFL feature flags that this driver supports */
|
||
if(flags) {
|
||
*flags = 0;
|
||
*flags|=H5FD_FEAT_DATA_SIEVE; /* OK to perform data sieving for faster raw data reads & writes */
|
||
*flags|=H5FD_FEAT_AGGREGATE_SMALLDATA; /* OK to aggregate "small" raw data allocations */
|
||
}
|
||
|
||
done:
|
||
FUNC_LEAVE_NOAPI(ret_value);
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
* Function: H5FD_gass_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: Saurabh Bagchi
|
||
* Monday, August 16, 1999
|
||
*
|
||
* Modifications:
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
static haddr_t
|
||
H5FD_gass_get_eoa(H5FD_t *_file)
|
||
{
|
||
H5FD_gass_t *file = (H5FD_gass_t *)_file;
|
||
haddr_t ret_value; /* Return value */
|
||
|
||
FUNC_ENTER_NOAPI(H5FD_gass_get_eoa, HADDR_UNDEF);
|
||
|
||
/* Set return value */
|
||
ret_value=file->eoa;
|
||
|
||
done:
|
||
FUNC_LEAVE_NOAPI(ret_value);
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
* Function: H5FD_gass_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
|
||
*
|
||
* Programmer: Saurabh Bagchi
|
||
* Monday, August 16, 1999
|
||
*
|
||
* Modifications:
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
static herr_t
|
||
H5FD_gass_set_eoa(H5FD_t *_file, haddr_t addr)
|
||
{
|
||
H5FD_gass_t *file = (H5FD_gass_t *)_file;
|
||
herr_t ret_value=SUCCEED; /* Return value */
|
||
|
||
FUNC_ENTER_NOAPI(H5FD_gass_set_eoa, FAIL);
|
||
|
||
file->eoa = addr;
|
||
|
||
done:
|
||
FUNC_LEAVE_NOAPI(ret_value);
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
* Function: H5FD_gass_get_eof
|
||
*
|
||
* Purpose: Returns the end-of-file marker, which is the greater of
|
||
* either the Unix end-of-file or the HDF5 end-of-address
|
||
* markers.
|
||
*
|
||
* Return: Success: End of file address, the first address past
|
||
* the end of the "file", either the Unix file
|
||
* or the HDF5 file.
|
||
*
|
||
* Failure: HADDR_UNDEF
|
||
*
|
||
* Programmer: Saurabh Bagchi
|
||
* Monday, August 16, 1999
|
||
*
|
||
* Modifications:
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
static haddr_t
|
||
H5FD_gass_get_eof(H5FD_t *_file)
|
||
{
|
||
H5FD_gass_t *file = (H5FD_gass_t*)_file;
|
||
haddr_t ret_value; /* Return value */
|
||
|
||
FUNC_ENTER_NOAPI(H5FD_gass_get_eof, HADDR_UNDEF);
|
||
|
||
/* Set return value */
|
||
ret_value=MAX(file->eof, file->eoa);
|
||
|
||
done:
|
||
FUNC_LEAVE_NOAPI(ret_value);
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
* Function: H5FD_gass_get_handle
|
||
*
|
||
* Purpose: Returns the file handle of GASS file driver.
|
||
*
|
||
* Returns: Non-negative if succeed or negative if fails.
|
||
*
|
||
* Programmer: Raymond Lu
|
||
* Sept. 16, 2002
|
||
*
|
||
* Modifications:
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
static herr_t
|
||
H5FD_gass_get_handle(H5FD_t *_file, hid_t UNUSED fapl, void** file_handle)
|
||
{
|
||
H5FD_gass_t *file = (H5FD_gass_t *)_file;
|
||
herr_t ret_value = SUCCEED;
|
||
|
||
FUNC_ENTER_NOAPI(H5FD_gass_get_handle, FAIL);
|
||
|
||
if(!file_handle)
|
||
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "file handle not valid");
|
||
|
||
*file_handle = &(file->fd);
|
||
|
||
done:
|
||
FUNC_LEAVE_NOAPI(ret_value);
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
* Function: H5FD_gass_read
|
||
*
|
||
* Purpose: Reads SIZE bytes of data from FILE beginning at address ADDR
|
||
* into buffer BUF.
|
||
*
|
||
* Return: Success: Zero. Result is stored in caller-supplied
|
||
* buffer BUF.
|
||
*
|
||
* Failure: -1, Contents of buffer BUF are undefined.
|
||
*
|
||
* Programmer: Saurabh Bagchi
|
||
* Monday, August 16, 1999
|
||
*
|
||
* Modifications:
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
static herr_t
|
||
H5FD_gass_read(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t dxpl_id/*unused*/, haddr_t addr,
|
||
size_t size, void *buf/*out*/)
|
||
{
|
||
H5FD_gass_t *file = (H5FD_gass_t*)_file;
|
||
ssize_t nbytes;
|
||
herr_t ret_value=SUCCEED; /* Return value */
|
||
|
||
FUNC_ENTER_NOAPI(H5FD_gass_read, FAIL);
|
||
|
||
assert(file && file->pub.cls);
|
||
assert(buf);
|
||
|
||
/* Check for overflow conditions */
|
||
if (HADDR_UNDEF==addr)
|
||
HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "addr undefined");
|
||
if (REGION_OVERFLOW(addr, size))
|
||
HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr too large");
|
||
if (addr+size>file->eoa)
|
||
HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr too large");
|
||
|
||
/* Seek to the correct location */
|
||
if ((addr!=file->pos || OP_READ!=file->op) &&
|
||
file_seek(file->fd, (file_offset_t)addr, SEEK_SET)<0) {
|
||
file->pos = HADDR_UNDEF;
|
||
file->op = OP_UNKNOWN;
|
||
HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "gass file seek failed");
|
||
}
|
||
|
||
/*
|
||
* Read data, being careful of interrupted system calls, partial results,
|
||
* and the end of the file.
|
||
*/
|
||
while (size>0) {
|
||
do
|
||
nbytes = read(file->fd, buf, size);
|
||
while (-1==nbytes && EINTR==errno);
|
||
|
||
if (-1==nbytes) {
|
||
/* error */
|
||
file->pos = HADDR_UNDEF;
|
||
file->op = OP_UNKNOWN;
|
||
HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "gass file read failed");
|
||
}
|
||
if (0==nbytes) {
|
||
/* end of file but not end of format address space */
|
||
memset(buf, 0, size);
|
||
size = 0;
|
||
}
|
||
assert(nbytes>=0);
|
||
assert(nbytes<=size);
|
||
size -= (hsize_t)nbytes;
|
||
addr += (haddr_t)nbytes;
|
||
buf = (char*)buf + nbytes;
|
||
}
|
||
|
||
/* Update current position */
|
||
file->pos = addr;
|
||
file->op = OP_READ;
|
||
|
||
done:
|
||
FUNC_LEAVE_NOAPI(ret_value);
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
* Function: H5FD_gass_write
|
||
*
|
||
* Purpose: Writes SIZE bytes of data to FILE beginning at address ADDR
|
||
* from buffer BUF.
|
||
*
|
||
* Return: Success: Zero
|
||
*
|
||
* Failure: -1
|
||
*
|
||
* Programmer: Saurabh Bagchi
|
||
* Tuesday, August 17, 1999
|
||
*
|
||
* Modifications:
|
||
*
|
||
*-------------------------------------------------------------------------
|
||
*/
|
||
static herr_t
|
||
H5FD_gass_write(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id/*unused*/, haddr_t addr,
|
||
size_t size, const void *buf)
|
||
{
|
||
H5FD_gass_t *file = (H5FD_gass_t*)_file;
|
||
ssize_t nbytes;
|
||
herr_t ret_value=SUCCEED; /* Return value */
|
||
|
||
FUNC_ENTER_NOAPI(H5FD_gass_write, FAIL);
|
||
|
||
assert(file && file->pub.cls);
|
||
assert(buf);
|
||
|
||
/* Check for overflow conditions */
|
||
if (HADDR_UNDEF==addr)
|
||
HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "addr undefined");
|
||
if (REGION_OVERFLOW(addr, size))
|
||
HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr too large");
|
||
if (addr+size>file->eoa)
|
||
HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr too large");
|
||
|
||
/* Seek to the correct location */
|
||
if ((addr!=file->pos || OP_WRITE!=file->op) &&
|
||
file_seek(file->fd, (file_offset_t)addr, SEEK_SET)<0) {
|
||
file->pos = HADDR_UNDEF;
|
||
file->op = OP_UNKNOWN;
|
||
HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "gass file seek failed");
|
||
}
|
||
|
||
/*
|
||
* Write the data, being careful of interrupted system calls and partial
|
||
* results
|
||
*/
|
||
while (size>0) {
|
||
do
|
||
nbytes = write(file->fd, buf, size);
|
||
while (-1==nbytes && EINTR==errno);
|
||
|
||
if (-1==nbytes) {
|
||
/* error */
|
||
file->pos = HADDR_UNDEF;
|
||
file->op = OP_UNKNOWN;
|
||
HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "gass file write failed");
|
||
}
|
||
assert(nbytes>0);
|
||
assert(nbytes<=size);
|
||
size -= (hsize_t)nbytes;
|
||
addr += (haddr_t)nbytes;
|
||
buf = (const char*)buf + nbytes;
|
||
}
|
||
|
||
/* Update current position and eof */
|
||
file->pos = addr;
|
||
file->op = OP_WRITE;
|
||
if (file->pos>file->eof)
|
||
file->eof = file->pos;
|
||
|
||
done:
|
||
FUNC_LEAVE_NOAPI(ret_value);
|
||
}
|
||
|
||
#endif /* H5_HAVE_GASS */
|