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netcdf-c/libhdf5/H5FDhttp.c
Dennis Heimbigner ac2e6f9a10 typo5
2019-01-02 21:37:31 -07:00

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/*********************************************************************
* Copyright 2018, UCAR/Unidata
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
* ********************************************************************/
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Programmer: Dennis Heimbigner dmh@ucar.edu
*
* Purpose: Access remote datasets using byte range requests.
* Derived from the HDF5 H5FDstdio.c file.
*
* NOTE: This driver is not as well tested as the standard SEC2 driver
* and is not intended for production use!
*/
#include "config.h"
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <hdf5.h>
#include <curl/curl.h>
#ifdef H5_HAVE_FLOCK
/* Needed for lock type definitions (e.g., LOCK_EX) */
#include <sys/file.h>
#endif /* H5_HAVE_FLOCK */
#ifdef H5_HAVE_UNISTD_H
#include <unistd.h>
#endif
/*
Define a simple #ifdef test for the version of H5FD_class_t we are using
*/
#if H5_VERS_MAJOR == 1
#if H5_VERS_MINOR < 10
#define H5FDCLASS1 1
#endif
#else
#error "Cannot determine version of H5FD_class_t"
#endif
#ifdef H5_HAVE_WIN32_API
/* The following two defines must be before any windows headers are included */
#define WIN32_LEAN_AND_MEAN /* Exclude rarely-used stuff from Windows headers */
#define NOGDI /* Exclude Graphic Display Interface macros */
#include <windows.h>
#include <io.h>
#endif /* H5_HAVE_WIN32_API */
#include "netcdf.h"
#include "ncbytes.h"
#include "nchttp.h"
#include "H5FDhttp.h"
typedef off_t file_offset_t;
/* The driver identification number, initialized at runtime */
static hid_t H5FD_HTTP_g = 0;
/* File operations */
typedef enum {
H5FD_HTTP_OP_UNKNOWN=0,
H5FD_HTTP_OP_READ=1,
H5FD_HTTP_OP_WRITE=2,
H5FD_HTTP_OP_SEEK=3
} H5FD_http_file_op;
/* 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 Unix file). The 'pos'
* value is used to eliminate file position updates when they would be a
* no-op. Unfortunately we've found systems that use separate file position
* indicators for reading and writing so the lseek can only be eliminated if
* the current operation is the same as the previous operation. When opening
* a file the 'eof' will be set to the current file size, 'eoa' will be set
* to zero, 'pos' will be set to H5F_ADDR_UNDEF (as it is when an error
* occurs), and 'op' will be set to H5F_OP_UNKNOWN.
*/
typedef struct H5FD_http_t {
H5FD_t pub; /* public stuff, must be first */
haddr_t eoa; /* end of allocated region */
haddr_t eof; /* end of file; current file size */
haddr_t pos; /* current file I/O position */
unsigned write_access; /* Flag to indicate the file was opened with write access */
H5FD_http_file_op op; /* last operation */
CURL* curl; /* Curl handle */
char* url; /* The URL (minus any fragment) for the dataset */
} H5FD_http_t;
/* 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 by the second
* argument of the file seek function.
*/
/* adding for windows NT filesystem support. */
#define MAXADDR (((haddr_t)1<<(8*sizeof(file_offset_t)-1))-1)
#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) || (file_offset_t)((A)+(Z))<(file_offset_t)(A))
/* Prototypes */
static H5FD_t *H5FD_http_open(const char *name, unsigned flags,
hid_t fapl_id, haddr_t maxaddr);
static herr_t H5FD_http_close(H5FD_t *lf);
static int H5FD_http_cmp(const H5FD_t *_f1, const H5FD_t *_f2);
static herr_t H5FD_http_query(const H5FD_t *_f1, unsigned long *flags);
static haddr_t H5FD_http_alloc(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, hsize_t size);
static haddr_t H5FD_http_get_eoa(const H5FD_t *_file, H5FD_mem_t type);
static herr_t H5FD_http_set_eoa(H5FD_t *_file, H5FD_mem_t type, haddr_t addr);
static herr_t H5FD_http_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle);
static herr_t H5FD_http_read(H5FD_t *lf, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
size_t size, void *buf);
static herr_t H5FD_http_write(H5FD_t *lf, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
size_t size, const void *buf);
/* The H5FD_class_t structure has different versions */
#ifdef H5FDCLASS1
static haddr_t H5FD_http_get_eof(const H5FD_t *_file);
static herr_t H5FD_http_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing);
static herr_t H5FD_http_lock(H5FD_t *_file, unsigned char* old, unsigned lock_type, hbool_t last);
static herr_t H5FD_http_unlock(H5FD_t *file, unsigned char *oid, hbool_t last);
#else
static herr_t H5FD_http_term(void);
static haddr_t H5FD_http_get_eof(const H5FD_t *_file, H5FD_mem_t type);
static herr_t H5FD_http_flush(H5FD_t *_file, hid_t dxpl_id, hbool_t closing);
static herr_t H5FD_http_lock(H5FD_t *_file, hbool_t rw);
static herr_t H5FD_http_unlock(H5FD_t *_file);
#endif
/* Beware, not same as H5FD_HTTP_g */
static const H5FD_class_t H5FD_http_g = {
"http", /* name */
MAXADDR, /* maxaddr */
H5F_CLOSE_WEAK, /* fc_degree */
#ifndef H5FDCLASS1
H5FD_http_term, /* terminate */
#endif
NULL, /* sb_size */
NULL, /* sb_encode */
NULL, /* sb_decode */
0, /* fapl_size */
NULL, /* fapl_get */
NULL, /* fapl_copy */
NULL, /* fapl_free */
0, /* dxpl_size */
NULL, /* dxpl_copy */
NULL, /* dxpl_free */
H5FD_http_open, /* open */
H5FD_http_close, /* close */
H5FD_http_cmp, /* cmp */
H5FD_http_query, /* query */
NULL, /* get_type_map */
H5FD_http_alloc, /* alloc */
NULL, /* free */
H5FD_http_get_eoa, /* get_eoa */
H5FD_http_set_eoa, /* set_eoa */
H5FD_http_get_eof, /* get_eof */
H5FD_http_get_handle, /* get_handle */
H5FD_http_read, /* read */
H5FD_http_write, /* write */
H5FD_http_flush, /* flush */
NULL, /* truncate */
H5FD_http_lock, /* lock */
H5FD_http_unlock, /* unlock */
H5FD_FLMAP_DICHOTOMY /* fl_map */
};
/*-------------------------------------------------------------------------
* Function: H5FD_http_init
*
* Purpose: Initialize this driver by registering the driver with the
* library.
*
* Return: Success: The driver ID for the driver.
*
* Failure: Negative.
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
*-------------------------------------------------------------------------
*/
EXTERNL hid_t
H5FD_http_init(void)
{
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
if (H5I_VFL!=H5Iget_type(H5FD_HTTP_g))
H5FD_HTTP_g = H5FDregister(&H5FD_http_g);
return H5FD_HTTP_g;
} /* end H5FD_http_init() */
/*---------------------------------------------------------------------------
* Function: H5FD_http_term
*
* Purpose: Shut down the VFD
*
* Returns: Non-negative on success or negative on failure
*
* Programmer: Quincey Koziol
* Friday, Jan 30, 2004
*
*---------------------------------------------------------------------------
*/
#ifndef H5FDCLASS1
static herr_t
H5FD_http_term(void)
{
/* Reset VFL ID */
H5FD_HTTP_g = 0;
return 0;
} /* end H5FD_http_term() */
#endif
/*-------------------------------------------------------------------------
* Function: H5Pset_fapl_http
*
* Purpose: Modify the file access property list to use the H5FD_HTTP
* driver defined in this source file. There are no driver
* specific properties.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Thursday, February 19, 1998
*
*-------------------------------------------------------------------------
*/
EXTERNL herr_t
H5Pset_fapl_http(hid_t fapl_id)
{
static const char *func = "H5FDset_fapl_http"; /*for error reporting*/
/*NO TRACE*/
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
if(0 == H5Pisa_class(fapl_id, H5P_FILE_ACCESS))
H5Epush_ret(func, H5E_ERR_CLS, H5E_PLIST, H5E_BADTYPE, "not a file access property list", -1)
return H5Pset_driver(fapl_id, H5FD_HTTP, NULL);
} /* end H5Pset_fapl_http() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_open
*
* Purpose: Opens a remote Object as an HDF5 file.
*
* Errors:
* IO CANTOPENFILE File doesn't exist and CREAT wasn't
* specified.
*
* 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: Dennis Heimbigner
*
*-------------------------------------------------------------------------
*/
static H5FD_t *
H5FD_http_open( const char *name, unsigned flags, hid_t /*UNUSED*/ fapl_id,
haddr_t maxaddr)
{
unsigned write_access = 0; /* File opened with write access? */
H5FD_http_t *file = NULL;
static const char *func = "H5FD_http_open"; /* Function Name for error reporting */
CURL* curl = NULL;
long long len = -1;
int ncstat = NC_NOERR;
/* Sanity check on file offsets */
assert(sizeof(file_offset_t) >= sizeof(size_t));
/* Quiet compiler */
fapl_id = fapl_id;
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
/* Check arguments */
if (!name || !*name)
H5Epush_ret(func, H5E_ERR_CLS, H5E_ARGS, H5E_BADVALUE, "invalid URL", NULL)
if (0 == maxaddr || HADDR_UNDEF == maxaddr)
H5Epush_ret(func, H5E_ERR_CLS, H5E_ARGS, H5E_BADRANGE, "bogus maxaddr", NULL)
if (ADDR_OVERFLOW(maxaddr))
H5Epush_ret(func, H5E_ERR_CLS, H5E_ARGS, H5E_OVERFLOW, "maxaddr too large", NULL)
/* Always read-only */
write_access = 0;
/* Open file in read-only mode, to check for existence and get length */
if((ncstat = nc_http_open(name,&curl,&len))) {
H5Epush_ret(func, H5E_ERR_CLS, H5E_IO, H5E_CANTOPENFILE, "cannot access object", NULL)
}
/* Build the return value */
if(NULL == (file = (H5FD_http_t *)H5allocate_memory(sizeof(H5FD_http_t),0))) {
nc_http_close(curl);
H5Epush_ret(func, H5E_ERR_CLS, H5E_RESOURCE, H5E_NOSPACE, "memory allocation failed", NULL)
} /* end if */
memset(file,0,sizeof(H5FD_http_t));
file->op = H5FD_HTTP_OP_SEEK;
file->pos = HADDR_UNDEF;
file->write_access = write_access; /* Note the write_access for later */
file->eof = (haddr_t)len;
file->curl = curl; curl = NULL;
file->url = H5allocate_memory(strlen(name+1),0);
if(file->url == NULL) {
nc_http_close(curl);
H5Epush_ret(func, H5E_ERR_CLS, H5E_RESOURCE, H5E_NOSPACE, "memory allocation failed", NULL)
}
memcpy(file->url,name,strlen(name)+1);
return((H5FD_t*)file);
} /* end H5FD_HTTP_OPen() */
/*-------------------------------------------------------------------------
* Function: H5F_http_close
*
* Purpose: Closes a file.
*
* Errors:
* IO CLOSEERROR Fclose failed.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Dennis Heimbigner
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_http_close(H5FD_t *_file)
{
H5FD_http_t *file = (H5FD_http_t*)_file;
#if 0
static const char *func = "H5FD_http_close"; /* Function Name for error reporting */
#endif
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
/* Close the underlying curl handle*/
if(file->curl) nc_http_close(file->curl);
if(file->url) H5free_memory(file->url);
H5free_memory(file);
return 0;
} /* end H5FD_http_close() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_cmp
*
* Purpose: Compares two files belonging to this driver using an
* arbitrary (but consistent) ordering.
*
* Return:
* Success: A value like strcmp()
*
* Failure: never fails (arguments were checked by the caller).
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
*-------------------------------------------------------------------------
*/
static int
H5FD_http_cmp(const H5FD_t *_f1, const H5FD_t *_f2)
{
const H5FD_http_t *f1 = (const H5FD_http_t*)_f1;
const H5FD_http_t *f2 = (const H5FD_http_t*)_f2;
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
if(strcmp(f1->url,f2->url) < 0) return -1;
if(strcmp(f1->url,f2->url) > 0) return 1;
return 0;
} /* H5FD_http_cmp() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_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
* Friday, August 25, 2000
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_http_query(const H5FD_t *_f, unsigned long /*OUT*/ *flags)
{
/* Quiet the compiler */
_f=_f;
/* Set the VFL feature flags that this driver supports.
*
* Note that this VFD does not support SWMR due to the unpredictable
* nature of the buffering layer.
*/
if(flags) {
*flags = 0;
*flags |= H5FD_FEAT_AGGREGATE_METADATA; /* OK to aggregate metadata allocations */
*flags |= H5FD_FEAT_ACCUMULATE_METADATA; /* OK to accumulate metadata for faster writes */
*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 */
#ifndef H5FDCLASS1
*flags |= H5FD_FEAT_DEFAULT_VFD_COMPATIBLE; /* VFD creates a file which can be opened with the default VFD */
#endif
}
return 0;
} /* end H5FD_http_query() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_alloc
*
* Purpose: Allocates file memory. If fseeko isn't available, makes
* sure the file size isn't bigger than 2GB because the
* parameter OFFSET of fseek is of the type LONG INT, limiting
* the file size to 2GB.
*
* Return:
* Success: Address of new memory
*
* Failure: HADDR_UNDEF
*
* Programmer: Raymond Lu
* 30 March 2007
*
*-------------------------------------------------------------------------
*/
static haddr_t
H5FD_http_alloc(H5FD_t *_file, H5FD_mem_t /*UNUSED*/ type, hid_t /*UNUSED*/ dxpl_id, hsize_t size)
{
H5FD_http_t *file = (H5FD_http_t*)_file;
haddr_t addr;
/* Quiet compiler */
type = type;
dxpl_id = dxpl_id;
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
/* Compute the address for the block to allocate */
addr = file->eoa;
file->eoa = addr + size;
return addr;
} /* end H5FD_http_alloc() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_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
*
*-------------------------------------------------------------------------
*/
static haddr_t
H5FD_http_get_eoa(const H5FD_t *_file, H5FD_mem_t /*UNUSED*/ type)
{
const H5FD_http_t *file = (const H5FD_http_t *)_file;
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
/* Quiet compiler */
type = type;
return file->eoa;
} /* end H5FD_http_get_eoa() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_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: Does not fail
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_http_set_eoa(H5FD_t *_file, H5FD_mem_t /*UNUSED*/ type, haddr_t addr)
{
H5FD_http_t *file = (H5FD_http_t*)_file;
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
/* Quiet the compiler */
type = type;
file->eoa = addr;
return 0;
}
/*-------------------------------------------------------------------------
* Function: H5FD_http_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: Robb Matzke
* Thursday, July 29, 1999
*
*-------------------------------------------------------------------------
*/
static haddr_t
#ifdef H5FDCLASS1
H5FD_http_get_eof(const H5FD_t *_file)
#else
H5FD_http_get_eof(const H5FD_t *_file, H5FD_mem_t /*UNUSED*/ type)
#endif
{
const H5FD_http_t *file = (const H5FD_http_t *)_file;
#ifndef H5FDCLASS1
/* Quiet the compiler */
type = type;
#endif
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
return(file->eof);
} /* end H5FD_http_get_eof() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_get_handle
*
* Purpose: Returns the file handle of file driver.
*
* Returns: Non-negative if succeed or negative if fails.
*
* Programmer: Raymond Lu
* Sept. 16, 2002
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_http_get_handle(H5FD_t *_file, hid_t /*UNUSED*/ fapl, void **file_handle)
{
H5FD_http_t *file = (H5FD_http_t *)_file;
static const char *func = "H5FD_http_get_handle"; /* Function Name for error reporting */
/* Quiet the compiler */
fapl = fapl;
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
*file_handle = file->curl;
if(*file_handle == NULL)
H5Epush_ret(func, H5E_ERR_CLS, H5E_IO, H5E_WRITEERROR, "get handle failed", -1)
return 0;
} /* end H5FD_http_get_handle() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_read
*
* Purpose: Reads SIZE bytes beginning at address ADDR in file LF and
* places them in buffer BUF. Reading past the logical or
* physical end of file returns zeros instead of failing.
*
* Errors:
* IO READERROR fread failed.
* IO SEEKERROR fseek failed.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_http_read(H5FD_t *_file, H5FD_mem_t /*UNUSED*/ type, hid_t /*UNUSED*/ dxpl_id,
haddr_t addr, size_t size, void /*OUT*/ *buf)
{
H5FD_http_t *file = (H5FD_http_t*)_file;
static const char *func = "H5FD_http_read"; /* Function Name for error reporting */
int ncstat = NC_NOERR;
/* Quiet the compiler */
type = type;
dxpl_id = dxpl_id;
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
/* Check for overflow */
if (HADDR_UNDEF==addr)
H5Epush_ret (func, H5E_ERR_CLS, H5E_IO, H5E_OVERFLOW, "file address overflowed", -1)
if (REGION_OVERFLOW(addr, size))
H5Epush_ret (func, H5E_ERR_CLS, H5E_IO, H5E_OVERFLOW, "file address overflowed", -1)
/* Check easy cases */
if (0 == size)
return 0;
if ((haddr_t)addr >= file->eof) {
memset(buf, 0, size);
return 0;
}
/* Seek to the correct file position. */
if (!(file->op == H5FD_HTTP_OP_READ || file->op == H5FD_HTTP_OP_SEEK) ||
file->pos != addr) {
#if 0
if (file_fseek(file->fp, (file_offset_t)addr, SEEK_SET) < 0) {
file->op = H5FD_HTTP_OP_UNKNOWN;
file->pos = HADDR_UNDEF;
H5Epush_ret(func, H5E_ERR_CLS, H5E_IO, H5E_SEEKERROR, "fseek failed", -1)
}
#endif
file->pos = addr;
}
/* Read zeros past the logical end of file (physical is handled below) */
if (addr + size > file->eof) {
size_t nbytes = (size_t) (addr + size - file->eof);
memset((unsigned char *)buf + size - nbytes, 0, nbytes);
size -= nbytes;
}
{
NCbytes* bbuf = ncbytesnew();
if((ncstat = nc_http_read(file->curl,file->url,addr,size,bbuf))) {
file->op = H5FD_HTTP_OP_UNKNOWN;
file->pos = HADDR_UNDEF;
ncbytesfree(bbuf); bbuf = NULL;
H5Epush_ret(func, H5E_ERR_CLS, H5E_IO, H5E_READERROR, "HTTP byte-range read failed", -1)
} /* end if */
/* Check that proper number of bytes was read */
if(ncbyteslength(bbuf) != size) {
ncbytesfree(bbuf); bbuf = NULL;
H5Epush_ret(func, H5E_ERR_CLS, H5E_IO, H5E_READERROR, "HTTP byte-range read mismatch ", -1)
}
/* Extract the data from buf */
memcpy(buf,ncbytescontents(bbuf),size);
ncbytesfree(bbuf);
}
/* Update the file position data. */
file->op = H5FD_HTTP_OP_READ;
file->pos = addr;
return 0;
}
/*-------------------------------------------------------------------------
* Function: H5FD_http_write
*
* Purpose: Writes SIZE bytes from the beginning of BUF into file LF at
* file address ADDR.
*
* Errors:
* IO SEEKERROR fseek failed.
* IO WRITEERROR fwrite failed.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Dennis Heimbigner
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_http_write(H5FD_t *_file, H5FD_mem_t /*UNUSED*/ type, hid_t /*UNUSED*/ dxpl_id,
haddr_t addr, size_t size, const void *buf)
{
static const char *func = "H5FD_http_write"; /* Function Name for error reporting */
/* Quiet the compiler */
dxpl_id = dxpl_id;
type = type;
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
/* Always Fails */
H5Epush_ret (func, H5E_ERR_CLS, H5E_IO, H5E_WRITEERROR, "file is read-only", -1)
return 0;
}
/*-------------------------------------------------------------------------
* Function: H5FD_http_flush
*
* Purpose: Makes sure that all data is on disk.
*
* Errors:
* IO SEEKERROR fseek failed.
* IO WRITEERROR fflush or fwrite failed.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Wednesday, October 22, 1997
*
*-------------------------------------------------------------------------
*/
static herr_t
#ifdef H5FDCLASS1
H5FD_http_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing)
#else
H5FD_http_flush(H5FD_t *_file, hid_t /*UNUSED*/ dxpl_id, hbool_t closing)
#endif
{
#ifndef H5FDCLASS1
/* Quiet the compiler */
dxpl_id = dxpl_id;
#endif
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
return 0;
} /* end H5FD_http_flush() */
/*-------------------------------------------------------------------------
* Function: H5FD_http_lock
*
* Purpose: Lock a file via flock
* NOTE: This function is a no-op if flock() is not present.
*
* Errors:
* IO FCNTL flock failed.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Vailin Choi; March 2015
*
*-------------------------------------------------------------------------
*/
static herr_t
#ifdef H5FDCLASS1
H5FD_http_lock(H5FD_t *_file, unsigned char* old, unsigned lock_type, hbool_t last)
#else
H5FD_http_lock(H5FD_t *_file, hbool_t rw)
#endif
{
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
#ifdef H5FDCLASS1
/* Quiet the compiler */
lock_type = lock_type;
last = last;
#else
rw = rw;
#endif
return 0;
} /* end H5FD_http_lock() */
/*-------------------------------------------------------------------------
* Function: H5F_http_unlock
*
* Purpose: Unlock a file via flock
* NOTE: This function is a no-op if flock() is not present.
*
* Errors:
* IO FCNTL flock failed.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Vailin Choi; March 2015
*
*-------------------------------------------------------------------------
*/
static herr_t
#ifdef H5FDCLASS1
H5FD_http_unlock(H5FD_t *file, /*UNUSED*/unsigned char *oid, /*UNUSED*/ hbool_t last)
#else
H5FD_http_unlock(H5FD_t *_file)
#endif
{
/* Clear the error stack */
H5Eclear2(H5E_DEFAULT);
/* Quiet the compiler */
#ifdef H5FDCLASS1
oid = oid;
last = last;
#endif
return 0;
} /* end H5FD_http_unlock() */
#ifdef _H5private_H
/*
* This is not related to the functionality of the driver code.
* It is added here to trigger warning if HDF5 private definitions are included
* by mistake. The code should use only HDF5 public API and definitions.
*/
#error "Do not use HDF5 private definitions"
#endif
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