diff options
Diffstat (limited to 'src/H5FDcore.c')
| -rw-r--r-- | src/H5FDcore.c | 63 |
1 files changed, 54 insertions, 9 deletions
diff --git a/src/H5FDcore.c b/src/H5FDcore.c index cbbda53..b27949b 100644 --- a/src/H5FDcore.c +++ b/src/H5FDcore.c @@ -49,6 +49,7 @@ typedef struct H5FD_core_t { haddr_t eoa; /*end of allocated region */ haddr_t eof; /*current allocated size */ size_t increment; /*multiples for mem allocation */ + hbool_t backing_store; /*write to file name on flush */ int fd; /*backing store file descriptor */ hbool_t dirty; /*changes not saved? */ } H5FD_core_t; @@ -368,23 +369,29 @@ done: * Modifications: * Robb Matzke, 1999-10-19 * The backing store file is created and opened if specified. + * + * Raymond Lu, 2006-11-30 + * Enabled the driver to read an existing file depending on + * the setting of the backing_store and file open flags. *------------------------------------------------------------------------- */ static H5FD_t * -H5FD_core_open(const char *name, unsigned UNUSED flags, hid_t fapl_id, +H5FD_core_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr) { + int o_flags; H5FD_core_t *file=NULL; H5FD_core_fapl_t *fa=NULL; H5P_genplist_t *plist; /* Property list pointer */ + h5_stat_t sb; int fd=-1; H5FD_t *ret_value; FUNC_ENTER_NOAPI(H5FD_core_open, NULL) /* Check arguments */ - if (!(H5F_ACC_CREAT & flags)) - HGOTO_ERROR(H5E_ARGS, H5E_UNSUPPORTED, NULL, "must create core files, not open them") + if (!name || !*name) + HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid file name") if (0==maxaddr || HADDR_UNDEF==maxaddr) HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr") if (ADDR_OVERFLOW(maxaddr)) @@ -395,10 +402,18 @@ H5FD_core_open(const char *name, unsigned UNUSED flags, hid_t fapl_id, fa = H5P_get_driver_info(plist); } /* end if */ - /* Open backing store */ - if (fa && fa->backing_store && name && - (fd=HDopen(name, (O_CREAT|O_TRUNC|O_RDWR), 0666))<0) - HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open backing store") + /* Build the open flags */ + o_flags = (H5F_ACC_RDWR & flags) ? O_RDWR : O_RDONLY; + if (H5F_ACC_TRUNC & flags) o_flags |= O_TRUNC; + if (H5F_ACC_CREAT & flags) o_flags |= O_CREAT; + if (H5F_ACC_EXCL & flags) o_flags |= O_EXCL; + + /* Open backing store. The only case that backing store is off is when + * the backing_store flag is off and H5F_ACC_CREAT is on. */ + if(fa->backing_store || !(H5F_ACC_CREAT & flags)) { + if (fa && (fd=HDopen(name, o_flags, 0666))<0) + HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open file") + } /* Create the new file struct */ if (NULL==(file=H5MM_calloc(sizeof(H5FD_core_t)))) @@ -414,6 +429,34 @@ H5FD_core_open(const char *name, unsigned UNUSED flags, hid_t fapl_id, */ file->increment = (fa && fa->increment>0) ? fa->increment : H5FD_CORE_INCREMENT; + /* If save data in backing store. */ + file->backing_store = fa->backing_store; + + /* If an existing file is opened, load the whole file into memory. */ + if(!(H5F_ACC_CREAT & flags)) { + unsigned char *x; + size_t size; + + if (HDfstat(file->fd, &sb)<0) + HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, NULL, "unable to fstat file") + + size = (size_t)sb.st_size; + + if(size) { + if (NULL==file->mem) + x = (unsigned char*)H5MM_malloc(size); + + if (!x) + HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "unable to allocate memory block") + + file->mem = x; + file->eof = size; + + if(HDread(file->fd, file->mem, size)<0) + HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to read file") + } + } + /* Set return value */ ret_value=(H5FD_t *)file; @@ -808,7 +851,9 @@ done: * Friday, October 15, 1999 * * Modifications: - * + * Raymond Lu, 2006-11-30 + * Added a condition check for backing store flag, for an + * existing file can be opened for read and write now. *------------------------------------------------------------------------- */ /* ARGSUSED */ @@ -821,7 +866,7 @@ H5FD_core_flush(H5FD_t *_file, hid_t UNUSED dxpl_id, unsigned UNUSED closing) FUNC_ENTER_NOAPI(H5FD_core_flush, FAIL) /* Write to backing store */ - if (file->dirty && file->fd>=0) { + if (file->dirty && file->fd>=0 && file->backing_store) { haddr_t size = file->eof; unsigned char *ptr = file->mem; |