/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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 files COPYING and Copyright.html. COPYING can be found at the root * * of the source code distribution tree; Copyright.html can be found at the * * root level of an installed copy of the electronic HDF5 document set and * * is linked from the top-level documents page. It can also be found at * * http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have * * access to either file, you may request a copy from help@hdfgroup.org. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /* * Programmer: Robb Matzke * Wednesday, October 22, 1997 * * Purpose: This is the Posix stdio.h I/O subclass of H5Flow. * It also serves as an example of coding a simple file driver, * therefore, it should not use any non-public definitions. * * Notes: Ported to the new H5FD architecture on 10/18/99 - QAK * */ #include #include #include /* Disable certain warnings in PC-Lint: */ /*lint --emacro( {534, 830}, H5P_FILE_ACCESS) */ /*lint --emacro( {534, 830}, H5F_ACC_RDWR, H5F_ACC_EXCL) */ /*lint -esym( 534, H5Eclear, H5Epush) */ #include "hdf5.h" #ifdef H5_HAVE_STDIO_H #include #endif #ifdef H5_HAVE_UNISTD_H #include #endif #ifdef WIN32 #include #include /* This is not defined in the Windows header files */ #ifndef F_OK #define F_OK 00 #endif #endif #ifdef MAX #undef MAX #endif /* MAX */ #define MAX(X,Y) ((X)>(Y)?(X):(Y)) /* The driver identification number, initialized at runtime */ static hid_t H5FD_STDIO_g = 0; /* File operations */ typedef enum { H5FD_STDIO_OP_UNKNOWN=0, H5FD_STDIO_OP_READ=1, H5FD_STDIO_OP_WRITE=2, H5FD_STDIO_OP_SEEK=3 } H5FD_stdio_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_stdio_t { H5FD_t pub; /*public stuff, must be first */ FILE * fp; /*the file handle */ haddr_t eoa; /*end of allocated region */ haddr_t eof; /*end of file; current file size*/ haddr_t pos; /*current file I/O position */ H5FD_stdio_file_op op; /*last operation */ unsigned write_access; /* Flag to indicate the file was opened with write access */ #ifndef WIN32 /* * On most systems the combination of device and i-node number uniquely * identify a file. */ dev_t device; /*file device number */ ino_t inode; /*file i-node number */ #else /* * On WIN32 the low-order word of a unique identifier associated with the * file and the volume serial number uniquely identify a file. This number * (which, both? -rpm) may change when the system is restarted or when the * file is opened. After a process opens a file, the identifier is * constant until the file is closed. An application can use this * identifier and the volume serial number to determine whether two * handles refer to the same file. */ DWORD fileindexlo; DWORD fileindexhi; #endif } H5FD_stdio_t; #ifdef H5_HAVE_LSEEK64 # define file_offset_t off64_t # define file_truncate ftruncate64 #elif defined (WIN32) && !defined(__MWERKS__) # /*MSVC*/ # define file_offset_t __int64 # define file_truncate _chsize #else # define file_offset_t off_t # define file_truncate ftruncate #endif /* * 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)) /* Define big file as 2GB */ #define BIG_FILE 0x80000000UL /* Prototypes */ static H5FD_t *H5FD_stdio_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr); static herr_t H5FD_stdio_close(H5FD_t *lf); static int H5FD_stdio_cmp(const H5FD_t *_f1, const H5FD_t *_f2); static herr_t H5FD_stdio_query(const H5FD_t *_f1, unsigned long *flags); static haddr_t H5FD_stdio_alloc(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, hsize_t size); static haddr_t H5FD_stdio_get_eoa(H5FD_t *_file); static herr_t H5FD_stdio_set_eoa(H5FD_t *_file, haddr_t addr); static haddr_t H5FD_stdio_get_eof(H5FD_t *_file); static herr_t H5FD_stdio_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle); static herr_t H5FD_stdio_read(H5FD_t *lf, H5FD_mem_t type, hid_t fapl_id, haddr_t addr, size_t size, void *buf); static herr_t H5FD_stdio_write(H5FD_t *lf, H5FD_mem_t type, hid_t fapl_id, haddr_t addr, size_t size, const void *buf); static herr_t H5FD_stdio_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing); static const H5FD_class_t H5FD_stdio_g = { "stdio", /*name */ MAXADDR, /*maxaddr */ H5F_CLOSE_WEAK, /* fc_degree */ 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_stdio_open, /*open */ H5FD_stdio_close, /*close */ H5FD_stdio_cmp, /*cmp */ H5FD_stdio_query, /*query */ H5FD_stdio_alloc, /*alloc */ NULL, /*free */ H5FD_stdio_get_eoa, /*get_eoa */ H5FD_stdio_set_eoa, /*set_eoa */ H5FD_stdio_get_eof, /*get_eof */ H5FD_stdio_get_handle, /*get_handle */ H5FD_stdio_read, /*read */ H5FD_stdio_write, /*write */ H5FD_stdio_flush, /*flush */ NULL, /*lock */ NULL, /*unlock */ H5FD_FLMAP_SINGLE /*fl_map */ }; /*------------------------------------------------------------------------- * Function: H5FD_stdio_init * * Purpose: Initialize this driver by registering the driver with the * library. * * Return: Success: The driver ID for the stdio driver. * * Failure: Negative. * * Programmer: Robb Matzke * Thursday, July 29, 1999 * * Modifications: * Stolen from the sec2 driver - QAK, 10/18/99 * *------------------------------------------------------------------------- */ hid_t H5FD_stdio_init(void) { /* Clear the error stack */ H5Eclear(); if (H5I_VFL!=H5Iget_type(H5FD_STDIO_g)) H5FD_STDIO_g = H5FDregister(&H5FD_stdio_g); return(H5FD_STDIO_g); } /*--------------------------------------------------------------------------- * Function: H5FD_stdio_term * * Purpose: Shut down the VFD * * Return: * * Programmer: Quincey Koziol * Friday, Jan 30, 2004 * * Modification: * *--------------------------------------------------------------------------- */ void H5FD_stdio_term(void) { /* Reset VFL ID */ H5FD_STDIO_g=0; } /* end H5FD_stdio_term() */ /*------------------------------------------------------------------------- * Function: H5Pset_fapl_stdio * * Purpose: Modify the file access property list to use the H5FD_STDIO * 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 * * Modifications: * Stolen from the sec2 driver - QAK, 10/18/99 * *------------------------------------------------------------------------- */ herr_t H5Pset_fapl_stdio(hid_t fapl_id) { static const char *func="H5FDset_fapl_stdio"; /*for error reporting*/ /*NO TRACE*/ /* Clear the error stack */ H5Eclear(); if(0 == H5Pisa_class(fapl_id, H5P_FILE_ACCESS)) H5Epush_ret(func, H5E_PLIST, H5E_BADTYPE, "not a file access property list", -1) return H5Pset_driver(fapl_id, H5FD_STDIO, NULL); } /*------------------------------------------------------------------------- * Function: H5FD_stdio_open * * Purpose: Create and/or opens a Standard C file as an HDF5 file. * * Bugs: H5F_ACC_EXCL has a race condition. (? -QAK) * * Errors: * IO CANTOPENFILE File doesn't exist and CREAT wasn't * specified. * IO CANTOPENFILE Fopen failed. * IO FILEEXISTS File exists but CREAT and EXCL were * 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: Robb Matzke * Wednesday, October 22, 1997 * * Modifications: * Ported to VFL/H5FD layer - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static H5FD_t * H5FD_stdio_open( const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr) { FILE *f = NULL; unsigned write_access=0; /* File opened with write access? */ H5FD_stdio_t *file=NULL; static const char *func="H5FD_stdio_open"; /* Function Name for error reporting */ #ifdef WIN32 HFILE filehandle; struct _BY_HANDLE_FILE_INFORMATION fileinfo; int fd; #else /* WIN32 */ struct stat sb; #endif /* WIN32 */ /* Sanity check on file offsets */ assert(sizeof(file_offset_t)>=sizeof(size_t)); /* Shut compiler up */ fapl_id=fapl_id; /* Clear the error stack */ H5Eclear(); /* Check arguments */ if (!name || !*name) H5Epush_ret(func, H5E_ARGS, H5E_BADVALUE, "invalid file name", NULL) if (0==maxaddr || HADDR_UNDEF==maxaddr) H5Epush_ret(func, H5E_ARGS, H5E_BADRANGE, "bogus maxaddr", NULL) if (ADDR_OVERFLOW(maxaddr)) H5Epush_ret(func, H5E_ARGS, H5E_OVERFLOW, "maxaddr too large", NULL) if (access(name, F_OK) < 0) { if ((flags & H5F_ACC_CREAT) && (flags & H5F_ACC_RDWR)) { f = fopen(name, "wb+"); write_access=1; /* Note the write access */ } else H5Epush_ret(func, H5E_IO, H5E_CANTOPENFILE, "file doesn't exist and CREAT wasn't specified", NULL) } else if ((flags & H5F_ACC_CREAT) && (flags & H5F_ACC_EXCL)) { H5Epush_ret(func, H5E_IO, H5E_FILEEXISTS, "file exists but CREAT and EXCL were specified", NULL) } else if (flags & H5F_ACC_RDWR) { if (flags & H5F_ACC_TRUNC) f = fopen(name, "wb+"); else f = fopen(name, "rb+"); write_access=1; /* Note the write access */ } else { f = fopen(name, "rb"); } if (!f) H5Epush_ret(func, H5E_IO, H5E_CANTOPENFILE, "fopen failed", NULL) /* Build the return value */ if (NULL==(file = calloc(1,sizeof(H5FD_stdio_t)))) H5Epush_ret(func, H5E_RESOURCE, H5E_NOSPACE, "memory allocation failed", NULL) file->fp = f; file->op = H5FD_STDIO_OP_SEEK; file->pos = HADDR_UNDEF; file->write_access=write_access; /* Note the write_access for later */ #ifdef H5_HAVE_FSEEKO if(fseeko(file->fp, (off_t)0, SEEK_END) < 0) { #else if(fseek(file->fp, (long)0L, SEEK_END) < 0) { #endif file->op = H5FD_STDIO_OP_UNKNOWN; } else { #ifdef H5_HAVE_FTELLO off_t x = ftello (file->fp); #else long x = ftell (file->fp); #endif assert (x>=0); file->eof = (haddr_t)x; } /* The unique key */ #ifdef WIN32 /*#error "Needs correct fileindexhi & fileindexlo, code below is from sec2 driver"*/ fd = _fileno(f); filehandle = _get_osfhandle(fd); (void)GetFileInformationByHandle((HANDLE)filehandle, &fileinfo); file->fileindexhi = fileinfo.nFileIndexHigh; file->fileindexlo = fileinfo.nFileIndexLow; #else fstat(fileno(file->fp), &sb); file->device = sb.st_dev; file->inode = sb.st_ino; #endif return((H5FD_t*)file); } /* end H5FD_stdio_open() */ /*------------------------------------------------------------------------- * Function: H5F_stdio_close * * Purpose: Closes a file. * * Errors: * IO CLOSEERROR Fclose failed. * * Return: Non-negative on success/Negative on failure * * Programmer: Robb Matzke * Wednesday, October 22, 1997 * * Modifications: * Ported to VFL/H5FD layer - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static herr_t H5FD_stdio_close(H5FD_t *_file) { H5FD_stdio_t *file = (H5FD_stdio_t*)_file; static const char *func="H5FD_stdio_close"; /* Function Name for error reporting */ /* Clear the error stack */ H5Eclear(); if (fclose(file->fp) < 0) H5Epush_ret(func, H5E_IO, H5E_CLOSEERROR, "fclose failed", -1) free(file); return(0); } /*------------------------------------------------------------------------- * Function: H5FD_stdio_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 * * Modifications: * Stolen from the sec2 driver - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static int H5FD_stdio_cmp(const H5FD_t *_f1, const H5FD_t *_f2) { const H5FD_stdio_t *f1 = (const H5FD_stdio_t*)_f1; const H5FD_stdio_t *f2 = (const H5FD_stdio_t*)_f2; /* Clear the error stack */ H5Eclear(); #ifdef WIN32 if (f1->fileindexhi < f2->fileindexhi) return -1; if (f1->fileindexhi > f2->fileindexhi) return 1; if (f1->fileindexlo < f2->fileindexlo) return -1; if (f1->fileindexlo > f2->fileindexlo) return 1; #else #ifdef H5_DEV_T_IS_SCALAR if (f1->device < f2->device) return -1; if (f1->device > f2->device) return 1; #else /* H5_DEV_T_IS_SCALAR */ /* If dev_t isn't a scalar value on this system, just use memcmp to * determine if the values are the same or not. The actual return value * shouldn't really matter... */ if(memcmp(&(f1->device),&(f2->device),sizeof(dev_t))<0) return -1; if(memcmp(&(f1->device),&(f2->device),sizeof(dev_t))>0) return 1; #endif /* H5_DEV_T_IS_SCALAR */ if (f1->inode < f2->inode) return -1; if (f1->inode > f2->inode) return 1; #endif return 0; } /*------------------------------------------------------------------------- * Function: H5FD_stdio_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 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5FD_stdio_query(const H5FD_t *_f, unsigned long *flags /* out */) { /* Shut compiler up */ _f=_f; /* Set the VFL feature flags that this driver supports */ 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 */ } return(0); } /*------------------------------------------------------------------------- * Function: H5FD_stdio_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 * * Modifications: * *------------------------------------------------------------------------- */ static haddr_t H5FD_stdio_alloc(H5FD_t *_file, H5FD_mem_t /*UNUSED*/ type, hid_t /*UNUSED*/ dxpl_id, hsize_t size) { H5FD_stdio_t *file = (H5FD_stdio_t*)_file; haddr_t addr; static const char *func="H5FD_stdio_alloc"; /* Function Name for error reporting */ haddr_t ret_value; /* Return value */ /* Clear the error stack */ H5Eclear(); /* Compute the address for the block to allocate */ addr = file->eoa; /* Check if we need to align this block */ if(size>=file->pub.threshold) { /* Check for an already aligned block */ if(addr%file->pub.alignment!=0) addr=((addr/file->pub.alignment)+1)*file->pub.alignment; } /* end if */ #ifndef H5_HAVE_FSEEKO /* If fseeko isn't available, big files (>2GB) won't be supported. */ if(addr+size>BIG_FILE) H5Epush_ret (func, H5E_IO, H5E_SEEKERROR, "can't write file bigger than 2GB because fseeko isn't available", -1) #endif file->eoa = addr+size; /* Set return value */ ret_value=addr; return(ret_value); } /* H5FD_stdio_alloc() */ /*------------------------------------------------------------------------- * Function: H5FD_stdio_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 * * Modifications: * Stolen from the sec2 driver - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static haddr_t H5FD_stdio_get_eoa(H5FD_t *_file) { H5FD_stdio_t *file = (H5FD_stdio_t*)_file; /* Clear the error stack */ H5Eclear(); return(file->eoa); } /*------------------------------------------------------------------------- * Function: H5FD_stdio_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: -1 * * Programmer: Robb Matzke * Thursday, July 29, 1999 * * Modifications: * Stolen from the sec2 driver - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static herr_t H5FD_stdio_set_eoa(H5FD_t *_file, haddr_t addr) { H5FD_stdio_t *file = (H5FD_stdio_t*)_file; /* Clear the error stack */ H5Eclear(); file->eoa = addr; return(0); } /*------------------------------------------------------------------------- * Function: H5FD_stdio_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 * * Modifications: * Stolen from the sec2 driver - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static haddr_t H5FD_stdio_get_eof(H5FD_t *_file) { H5FD_stdio_t *file = (H5FD_stdio_t*)_file; /* Clear the error stack */ H5Eclear(); return(MAX(file->eof, file->eoa)); } /*------------------------------------------------------------------------- * Function: H5FD_stdio_get_handle * * Purpose: Returns the file handle of stdio file driver. * * Returns: Non-negative if succeed or negative if fails. * * Programmer: Raymond Lu * Sept. 16, 2002 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5FD_stdio_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle) { H5FD_stdio_t *file = (H5FD_stdio_t *)_file; static const char *func="H5FD_stdio_get_handle"; /* Function Name for error reporting */ /* Shut compiler up */ fapl=fapl; /* Clear the error stack */ H5Eclear(); *file_handle = &(file->fp); if(*file_handle==NULL) H5Epush_ret(func, H5E_IO, H5E_WRITEERROR, "get handle failed", -1) return(0); } /*------------------------------------------------------------------------- * Function: H5F_stdio_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 * * Modifications: * June 2, 1998 Albert Cheng * Added xfer_mode argument * * Ported to VFL/H5FD layer - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static herr_t H5FD_stdio_read(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size, void *buf/*out*/) { size_t n; H5FD_stdio_t *file = (H5FD_stdio_t*)_file; static const char *func="H5FD_stdio_read"; /* Function Name for error reporting */ /* Shut compiler up */ type=type; dxpl_id=dxpl_id; /* Clear the error stack */ H5Eclear(); /* Check for overflow */ if (HADDR_UNDEF==addr) H5Epush_ret (func, H5E_IO, H5E_OVERFLOW, "file address overflowed", -1) if (REGION_OVERFLOW(addr, size)) H5Epush_ret (func, H5E_IO, H5E_OVERFLOW, "file address overflowed", -1) if (addr+size>file->eoa) H5Epush_ret (func, 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_STDIO_OP_READ || file->op==H5FD_STDIO_OP_SEEK) || file->pos != addr) { #ifdef H5_HAVE_FSEEKO if (fseeko(file->fp, (off_t)addr, SEEK_SET) < 0) { #else if (fseek(file->fp, (long)addr, SEEK_SET) < 0) { #endif file->op = H5FD_STDIO_OP_UNKNOWN; file->pos = HADDR_UNDEF; H5Epush_ret(func, H5E_IO, H5E_SEEKERROR, "fseek failed", -1) } 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; } /* * Read the data. Since we're reading single-byte values, a partial read * will advance the file position by N. If N is zero or an error * occurs then the file position is undefined. */ n = fread(buf, 1, size, file->fp); if (n == 0 && ferror(file->fp)) { file->op = H5FD_STDIO_OP_UNKNOWN; file->pos = HADDR_UNDEF; H5Epush_ret(func, H5E_IO, H5E_READERROR, "fread failed", -1) } else if (n < size) { memset((unsigned char *)buf + n, 0, (size - n)); } /* * Update the file position data. */ file->op = H5FD_STDIO_OP_READ; file->pos = addr+n; /*checked for overflow above*/ return(0); } /*------------------------------------------------------------------------- * Function: H5F_stdio_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: Robb Matzke * Wednesday, October 22, 1997 * * Modifications: * June 2, 1998 Albert Cheng * Added xfer_mode argument * * Ported to VFL/H5FD layer - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static herr_t H5FD_stdio_write(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size, const void *buf) { H5FD_stdio_t *file = (H5FD_stdio_t*)_file; static const char *func="H5FD_stdio_write"; /* Function Name for error reporting */ /* Shut compiler up */ dxpl_id=dxpl_id; type=type; /* Clear the error stack */ H5Eclear(); /* Check for overflow conditions */ if (HADDR_UNDEF==addr) H5Epush_ret (func, H5E_IO, H5E_OVERFLOW, "file address overflowed", -1) if (REGION_OVERFLOW(addr, size)) H5Epush_ret (func, H5E_IO, H5E_OVERFLOW, "file address overflowed", -1) if (addr+size>file->eoa) H5Epush_ret (func, H5E_IO, H5E_OVERFLOW, "file address overflowed", -1) /* * Seek to the correct file position. */ if ((file->op != H5FD_STDIO_OP_WRITE && file->op != H5FD_STDIO_OP_SEEK) || file->pos != addr) { #ifdef H5_HAVE_FSEEKO if (fseeko(file->fp, (off_t)addr, SEEK_SET) < 0) { #else if (fseek(file->fp, (long)addr, SEEK_SET) < 0) { #endif file->op = H5FD_STDIO_OP_UNKNOWN; file->pos = HADDR_UNDEF; H5Epush_ret(func, H5E_IO, H5E_SEEKERROR, "fseek failed", -1) } file->pos = addr; } /* * Write the buffer. On successful return, the file position will be * advanced by the number of bytes read. Otherwise nobody knows where it * is. */ if (size != fwrite(buf, 1, size, file->fp)) { file->op = H5FD_STDIO_OP_UNKNOWN; file->pos = HADDR_UNDEF; H5Epush_ret(func, H5E_IO, H5E_WRITEERROR, "fwrite failed", -1) } /* * Update seek optimizing data. */ file->op = H5FD_STDIO_OP_WRITE; file->pos = addr + size; /* Update EOF if necessary */ if (file->pos>file->eof) file->eof = file->pos; return(0); } /*------------------------------------------------------------------------- * Function: H5F_stdio_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 * * Modifications: * Ported to VFL/H5FD layer - QAK, 10/18/99 * *------------------------------------------------------------------------- */ static herr_t H5FD_stdio_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing) { H5FD_stdio_t *file = (H5FD_stdio_t*)_file; static const char *func="H5FD_stdio_flush"; /* Function Name for error reporting */ /* Shut compiler up */ dxpl_id=dxpl_id; /* Clear the error stack */ H5Eclear(); /* Only try to flush the file if we have write access */ if(file->write_access) { /* Makes sure that the true file size is the same as the end-of-address. */ if (file->eoa!=file->eof) { #ifdef WIN32 int fd=_fileno(file->fp); /* File descriptor for HDF5 file */ HFILE filehandle; /* Windows file handle */ LARGE_INTEGER li; /* 64-bit integer for SetFilePointer() call */ /* Map the posix file handle to a Windows file handle */ filehandle = _get_osfhandle(fd); /* Translate 64-bit integers into form Windows wants */ /* [This algorithm is from the Windows documentation for SetFilePointer()] */ li.QuadPart = (LONGLONG)file->eoa; (void)SetFilePointer((HANDLE)filehandle,li.LowPart,&li.HighPart,FILE_BEGIN); if(SetEndOfFile((HANDLE)filehandle)==0) H5Epush_ret(func, H5E_IO, H5E_SEEKERROR, "unable to extend file properly", -1) #else /* WIN32 */ int fd=fileno(file->fp); /* File descriptor for HDF5 file */ if (-1==file_truncate(fd, (file_offset_t)file->eoa)) H5Epush_ret(func, H5E_IO, H5E_SEEKERROR, "unable to extend file properly", -1) #endif /* WIN32 */ /* Update the eof value */ file->eof = file->eoa; /* Reset last file I/O information */ file->pos = HADDR_UNDEF; file->op = H5FD_STDIO_OP_UNKNOWN; } /* end if */ /* * Flush */ if(!closing) { if (fflush(file->fp) < 0) H5Epush_ret(func, H5E_IO, H5E_WRITEERROR, "fflush failed", -1) } /* end if */ } /* end if */ else { /* Double-check for problems */ if (file->eoa>file->eof) H5Epush_ret(func, H5E_IO, H5E_TRUNCATED, "eoa>eof!", -1) } /* end else */ return(0); } #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