mirror of
https://github.com/Unidata/netcdf-c.git
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735 lines
14 KiB
C
735 lines
14 KiB
C
/*
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* Copyright 1996, University Corporation for Atmospheric Research
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* See netcdf/COPYRIGHT file for copying and redistribution conditions.
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*/
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/* $Id: winceio.c,v 1.2 2010/05/04 17:30:04 dmh Exp $ */
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/* Dennis Heimbigner 2010-3-04 */
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#include <config.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h> /* DEBUG */
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#ifndef _WIN32_WCE
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#include <errno.h>
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#else
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#define EPERM NC_EPERM
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#define ENOMEM NC_ENOMEM
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#define EINVAL NC_EINVAL
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#define EIO NC_EINVAL
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#define EEXIST NC_EEXIST
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#endif
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#ifndef ENOERR
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#define ENOERR 0
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#endif
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#include <string.h>
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#include <stdio.h>
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#include "ncio.h"
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#include "fbits.h"
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#include "rnd.h"
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#if !defined(NDEBUG) && !defined(X_INT_MAX)
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#define X_INT_MAX 2147483647
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#endif
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#if 0 /* !defined(NDEBUG) && !defined(X_ALIGN) */
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#define X_ALIGN 4
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#endif
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#define ALWAYS_NC_SHARE 0 /* DEBUG */
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#define DEFAULTBLKSIZE 32768
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static FILE* descriptors[1024];
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static int fdmax = 1; /* never use zero */
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/* Begin OS */
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/*
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* What is the preferred I/O block size?
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* (This becomes the default *sizehint == ncp->chunk in the higher layers.)
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* TODO: What is the the best answer here?
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*/
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static size_t
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blksize(int fd)
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{
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return (size_t) DEFAULTBLKSIZE;
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}
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/*
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* Sortof like ftruncate, except won't make the
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* file shorter.
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*/
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static int
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fgrow(FILE* f, const off_t len)
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{
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int status = ENOERR;
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long pos = ftell(f);
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long size;
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pos = ftell(f);
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status = fseek(f,0,SEEK_END);
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if(ferror(f)) return EIO;
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size = ftell(f);
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status = fseek(f,pos,SEEK_SET);
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if(ferror(f)) return EIO;
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if(len < size) return ENOERR;
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else {
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const long dumb = 0;
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status = fseek(f, len-sizeof(dumb), SEEK_SET);
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if(ferror(f)) return EIO;
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fwrite((const void *)&dumb, 1, sizeof(dumb), f);
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if(ferror(f)) return EIO;
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status = fseek(f, pos, SEEK_SET);
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if(ferror(f)) return EIO;
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}
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return ENOERR;
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}
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/*
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* Sortof like ftruncate, except won't make the file shorter. Differs
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* from fgrow by only writing one byte at designated seek position, if
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* needed.
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*/
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static int
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fgrow2(FILE* f, const off_t len)
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{
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int status = ENOERR;
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long pos = ftell(f);
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long size;
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pos = ftell(f);
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status = fseek(f,0,SEEK_END);
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if(ferror(f)) return EIO;
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size = ftell(f);
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status = fseek(f,pos,SEEK_SET);
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if(ferror(f)) return EIO;
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if(len < size) return ENOERR;
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else {
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const char dumb = 0;
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status = fseek(f, len-sizeof(dumb), SEEK_SET);
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if(ferror(f)) return EIO;
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fwrite((const void *)&dumb, 1, sizeof(dumb), f);
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if(ferror(f)) return EIO;
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status = fseek(f, pos, SEEK_SET);
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if(ferror(f)) return EIO;
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}
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return ENOERR;
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}
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/* End OS */
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/* Begin ffio */
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static int
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fileio_pgout(ncio *const nciop,
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off_t const offset, const size_t extent,
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const void *const vp, off_t *posp)
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{
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int status = ENOERR;
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FILE* f = descriptors[nciop->fd];
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#ifdef X_ALIGN
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assert(offset % X_ALIGN == 0);
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assert(extent % X_ALIGN == 0);
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#endif
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if(*posp != offset)
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{
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status = fseek(f, offset, SEEK_SET);
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if(ferror(f)) return EIO;
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*posp = offset;
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}
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fwrite(vp,1,extent,f);
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if(ferror(f)) return EIO;
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*posp += extent;
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return ENOERR;
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}
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static int
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fileio_pgin(ncio *const nciop,
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off_t const offset, const size_t extent,
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void *const vp, size_t *nreadp, off_t *posp)
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{
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int status = ENOERR;
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ssize_t nread;
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int count;
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FILE* f = descriptors[nciop->fd];
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#ifdef X_ALIGN
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assert(offset % X_ALIGN == 0);
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assert(extent % X_ALIGN == 0);
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#endif
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if(*posp != offset)
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{
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status = fseek(f, offset, SEEK_SET);
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if(ferror(f)) return EIO;
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*posp = offset;
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}
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nread = fread(vp,1,extent,f);
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if(ferror(f)) return EIO;
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*nreadp = nread;
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*posp += nread;
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return ENOERR;
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}
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/* */
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typedef struct ncio_ffio {
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off_t pos;
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/* buffer */
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off_t bf_offset;
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size_t bf_extent;
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size_t bf_cnt;
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void *bf_base;
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} ncio_ffio;
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static int
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ncio_fileio_rel(ncio *const nciop, off_t offset, int rflags)
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{
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int status = ENOERR;
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FILE* f = descriptors[nciop->fd];
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ncio_ffio *ffp = (ncio_ffio *)nciop->pvt;
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assert(ffp->bf_offset <= offset);
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assert(ffp->bf_cnt != 0);
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assert(ffp->bf_cnt <= ffp->bf_extent);
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#ifdef X_ALIGN
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assert(offset < ffp->bf_offset + X_ALIGN);
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assert(ffp->bf_cnt % X_ALIGN == 0 );
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#endif
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if(fIsSet(rflags, RGN_MODIFIED))
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{
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if(!fIsSet(nciop->ioflags, NC_WRITE))
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return EPERM; /* attempt to write readonly file */
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status = fileio_pgout(nciop, ffp->bf_offset,
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ffp->bf_cnt,
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ffp->bf_base, &ffp->pos);
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/* if error, invalidate buffer anyway */
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}
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ffp->bf_offset = OFF_NONE;
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ffp->bf_cnt = 0;
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return status;
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}
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static int
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ncio_fileio_get(ncio *const nciop,
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off_t offset, size_t extent,
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int rflags,
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void **const vpp)
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{
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ncio_ffio *ffp = (ncio_ffio *)nciop->pvt;
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int status = ENOERR;
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FILE* f = descriptors[nciop->fd];
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#ifdef X_ALIGN
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size_t rem;
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#endif
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if(fIsSet(rflags, RGN_WRITE) && !fIsSet(nciop->ioflags, NC_WRITE))
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return EPERM; /* attempt to write readonly file */
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assert(extent != 0);
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assert(extent < X_INT_MAX); /* sanity check */
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assert(ffp->bf_cnt == 0);
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#ifdef X_ALIGN
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/* round to seekable boundaries */
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rem = offset % X_ALIGN;
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if(rem != 0)
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{
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offset -= rem;
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extent += rem;
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}
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{
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const size_t rndup = extent % X_ALIGN;
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if(rndup != 0)
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extent += X_ALIGN - rndup;
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}
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assert(offset % X_ALIGN == 0);
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assert(extent % X_ALIGN == 0);
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#endif
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if(ffp->bf_extent < extent)
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{
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if(ffp->bf_base != NULL)
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{
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free(ffp->bf_base);
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ffp->bf_base = NULL;
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ffp->bf_extent = 0;
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}
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assert(ffp->bf_extent == 0);
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ffp->bf_base = malloc(extent);
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if(ffp->bf_base == NULL)
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return ENOMEM;
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ffp->bf_extent = extent;
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}
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status = fileio_pgin(nciop, offset,
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extent,
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ffp->bf_base,
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&ffp->bf_cnt, &ffp->pos);
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if(status != ENOERR)
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return status;
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ffp->bf_offset = offset;
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if(ffp->bf_cnt < extent)
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{
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(void) memset((char *)ffp->bf_base + ffp->bf_cnt, 0,
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extent - ffp->bf_cnt);
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ffp->bf_cnt = extent;
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}
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#ifdef X_ALIGN
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*vpp = (char *)ffp->bf_base + rem;
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#else
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*vpp = (char *)ffp->bf_base;
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#endif
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return ENOERR;
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}
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static int
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ncio_fileio_move(ncio *const nciop, off_t to, off_t from,
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size_t nbytes, int rflags)
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{
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int status = ENOERR;
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off_t lower = from;
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off_t upper = to;
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char *base;
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size_t diff = upper - lower;
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size_t extent = diff + nbytes;
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FILE* f = descriptors[nciop->fd];
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rflags &= RGN_NOLOCK; /* filter unwanted flags */
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if(to == from)
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return ENOERR; /* NOOP */
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if(to > from)
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{
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/* growing */
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lower = from;
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upper = to;
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}
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else
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{
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/* shrinking */
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lower = to;
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upper = from;
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}
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diff = upper - lower;
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extent = diff + nbytes;
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status = ncio_fileio_get(nciop, lower, extent, RGN_WRITE|rflags,
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(void **)&base);
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if(status != ENOERR)
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return status;
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if(to > from)
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(void) memmove(base + diff, base, nbytes);
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else
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(void) memmove(base, base + diff, nbytes);
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(void) ncio_fileio_rel(nciop, lower, RGN_MODIFIED);
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return status;
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}
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static int
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ncio_fileio_sync(ncio *const nciop)
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{
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FILE* f = descriptors[nciop->fd];
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fflush(f);
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return ENOERR;
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}
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static void
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ncio_fileio_free(void *const pvt)
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{
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ncio_ffio *ffp = (ncio_ffio *)pvt;
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if(ffp == NULL)
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return;
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if(ffp->bf_base != NULL)
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{
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free(ffp->bf_base);
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ffp->bf_base = NULL;
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ffp->bf_offset = OFF_NONE;
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ffp->bf_extent = 0;
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ffp->bf_cnt = 0;
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}
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}
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static int
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ncio_fileio_init2(ncio *const nciop, size_t *sizehintp)
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{
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FILE* f = descriptors[nciop->fd];
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ncio_ffio *ffp = (ncio_ffio *)nciop->pvt;
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assert(f != NULL);
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ffp->bf_extent = *sizehintp;
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assert(ffp->bf_base == NULL);
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/* this is separate allocation because it may grow */
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ffp->bf_base = malloc(ffp->bf_extent);
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if(ffp->bf_base == NULL)
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{
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ffp->bf_extent = 0;
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return ENOMEM;
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}
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/* else */
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return ENOERR;
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}
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static void
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ncio_fileio_init(ncio *const nciop)
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{
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ncio_ffio *ffp = (ncio_ffio *)nciop->pvt;
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*((ncio_relfunc **)&nciop->rel) = ncio_fileio_rel; /* cast away const */
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*((ncio_getfunc **)&nciop->get) = ncio_fileio_get; /* cast away const */
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*((ncio_movefunc **)&nciop->move) = ncio_fileio_move; /* cast away const */
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*((ncio_syncfunc **)&nciop->sync) = ncio_fileio_sync; /* cast away const */
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*((ncio_freefunc **)&nciop->free) = ncio_fileio_free; /* cast away const */
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ffp->pos = -1;
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ffp->bf_offset = OFF_NONE;
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ffp->bf_extent = 0;
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ffp->bf_cnt = 0;
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ffp->bf_base = NULL;
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}
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/* */
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static void
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ncio_free(ncio *nciop)
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{
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if(nciop == NULL)
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return;
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if(nciop->free != NULL)
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nciop->free(nciop->pvt);
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free(nciop);
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}
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static ncio *
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ncio_new(const char *path, int ioflags)
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{
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size_t sz_ncio = M_RNDUP(sizeof(ncio));
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size_t sz_path = M_RNDUP(strlen(path) +1);
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size_t sz_ncio_pvt;
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ncio *nciop;
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#if ALWAYS_NC_SHARE /* DEBUG */
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fSet(ioflags, NC_SHARE);
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#endif
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if(fIsSet(ioflags, NC_SHARE))
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fprintf(stderr, "NC_SHARE not implemented for fileio\n");
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sz_ncio_pvt = sizeof(ncio_ffio);
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nciop = (ncio *) malloc(sz_ncio + sz_path + sz_ncio_pvt);
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if(nciop == NULL)
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return NULL;
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nciop->ioflags = ioflags;
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*((int *)&nciop->fd) = -1; /* cast away const */
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nciop->path = (char *) ((char *)nciop + sz_ncio);
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(void) strcpy((char *)nciop->path, path); /* cast away const */
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/* cast away const */
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*((void **)&nciop->pvt) = (void *)(nciop->path + sz_path);
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ncio_fileio_init(nciop);
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return nciop;
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}
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/* Public below this point */
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/* TODO: Is this reasonable for this platform? */
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static const size_t NCIO_MINBLOCKSIZE = 0x100;
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static const size_t NCIO_MAXBLOCKSIZE = 0x100000;
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int
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ncio_create(const char *path, int ioflags,
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size_t initialsz,
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off_t igeto, size_t igetsz, size_t *sizehintp,
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ncio **nciopp, void **const igetvpp)
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{
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ncio *nciop;
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#ifdef _WIN32_WCE
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char* oflags = "bw+"; /*==?(O_RDWR|O_CREAT|O_TRUNC) && binary*/
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#else
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char* oflags = "w+"; /*==?(O_RDWR|O_CREAT|O_TRUNC);*/
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#endif
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FILE* f;
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int i,fd;
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int status = ENOERR;
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if(initialsz < (size_t)igeto + igetsz)
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initialsz = (size_t)igeto + igetsz;
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fSet(ioflags, NC_WRITE);
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if(path == NULL || *path == 0)
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return EINVAL;
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nciop = ncio_new(path, ioflags);
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if(nciop == NULL)
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return ENOMEM;
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if(fIsSet(ioflags, NC_NOCLOBBER)) {
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/* Since we do not have use of the O_EXCL flag,
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we need to fake it */
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#ifdef WINCE
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f = fopen(path,"rb");
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#else
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f = fopen(path,"r");
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#endif
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if(f != NULL) { /* do not overwrite */
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(void)fclose(f);
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return EEXIST;
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}
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}
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f = fopen(path, oflags);
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if(f == NULL)
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{
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status = errno;
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goto unwind_new;
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}
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/* Locate an open pseudo file descriptor */
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fd = -1;
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for(i=1;i<fdmax;i++) {if(descriptors[i] == NULL) {fd=i;break;}}
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if(fd < 0) {fd = fdmax; fdmax++;}
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descriptors[fd] = f;
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*((int *)&nciop->fd) = fd; /* cast away const */
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if(*sizehintp < NCIO_MINBLOCKSIZE || *sizehintp > NCIO_MAXBLOCKSIZE)
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{
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/* Use default */
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*sizehintp = blksize(fd);
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}
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else
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{
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*sizehintp = M_RNDUP(*sizehintp);
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}
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status = ncio_fileio_init2(nciop, sizehintp);
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if(status != ENOERR)
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goto unwind_open;
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if(initialsz != 0)
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{
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status = fgrow(f, (off_t)initialsz);
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if(status != ENOERR)
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goto unwind_open;
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}
|
|
|
|
if(igetsz != 0)
|
|
{
|
|
status = nciop->get(nciop,
|
|
igeto, igetsz,
|
|
RGN_WRITE,
|
|
igetvpp);
|
|
if(status != ENOERR)
|
|
goto unwind_open;
|
|
}
|
|
|
|
*nciopp = nciop;
|
|
return ENOERR;
|
|
|
|
unwind_open:
|
|
(void) fclose(descriptors[fd]);
|
|
descriptors[fd] = NULL;
|
|
/* ?? unlink */
|
|
/*FALLTHRU*/
|
|
unwind_new:
|
|
ncio_free(nciop);
|
|
return status;
|
|
}
|
|
|
|
|
|
int
|
|
ncio_open(const char *path,
|
|
int ioflags,
|
|
off_t igeto, size_t igetsz, size_t *sizehintp,
|
|
ncio **nciopp, void **const igetvpp)
|
|
{
|
|
ncio *nciop;
|
|
char* oflags = fIsSet(ioflags, NC_WRITE) ? "r+"
|
|
#ifdef WINCE
|
|
: "rb";
|
|
#else
|
|
: "r";
|
|
#endif
|
|
FILE* f;
|
|
int i,fd;
|
|
int status = ENOERR;
|
|
|
|
if(path == NULL || *path == 0)
|
|
return EINVAL;
|
|
|
|
nciop = ncio_new(path, ioflags);
|
|
if(nciop == NULL)
|
|
return ENOMEM;
|
|
|
|
f = fopen(path, oflags);
|
|
|
|
if(f == NULL)
|
|
{
|
|
status = errno;
|
|
goto unwind_new;
|
|
}
|
|
|
|
/* Locate an open pseudo file descriptor */
|
|
fd = -1;
|
|
for(i=1;i<fdmax;i++) {if(descriptors[i] == NULL) {fd=i;break;}}
|
|
if(fd < 0) {fd = fdmax; fdmax++;}
|
|
descriptors[fd] = f;
|
|
|
|
*((int *)&nciop->fd) = fd; /* cast away const */
|
|
|
|
if(*sizehintp < NCIO_MINBLOCKSIZE || *sizehintp > NCIO_MAXBLOCKSIZE)
|
|
{
|
|
/* Use default */
|
|
*sizehintp = blksize(fd);
|
|
}
|
|
else
|
|
{
|
|
*sizehintp = M_RNDUP(*sizehintp);
|
|
}
|
|
|
|
status = ncio_fileio_init2(nciop, sizehintp);
|
|
if(status != ENOERR)
|
|
goto unwind_open;
|
|
|
|
if(igetsz != 0)
|
|
{
|
|
status = nciop->get(nciop,
|
|
igeto, igetsz,
|
|
0,
|
|
igetvpp);
|
|
if(status != ENOERR)
|
|
goto unwind_open;
|
|
}
|
|
|
|
*nciopp = nciop;
|
|
return ENOERR;
|
|
|
|
unwind_open:
|
|
(void) fclose(descriptors[fd]);
|
|
descriptors[fd] = NULL;
|
|
/*FALLTHRU*/
|
|
unwind_new:
|
|
ncio_free(nciop);
|
|
return status;
|
|
}
|
|
|
|
|
|
/*
|
|
* Get file size in bytes.
|
|
* Is use of fstatus = fseek() really necessary, or could we use standard fstat() call
|
|
* and get st_size member?
|
|
*/
|
|
int
|
|
ncio_filesize(ncio *nciop, off_t *filesizep)
|
|
{
|
|
int status = ENOERR;
|
|
off_t filesize, current, reset;
|
|
FILE* f;
|
|
|
|
if(nciop == NULL)
|
|
return EINVAL;
|
|
|
|
f = descriptors[nciop->fd];
|
|
|
|
current = ftell(f);
|
|
status = fseek(f, 0, SEEK_END); /* get size */
|
|
if(ferror(f)) return EIO;
|
|
*filesizep = ftell(f);
|
|
status = fseek(f, current, SEEK_SET); /* reset */
|
|
if(ferror(f)) return EIO;
|
|
return ENOERR;
|
|
}
|
|
|
|
|
|
/*
|
|
* Sync any changes to disk, then extend file so its size is length.
|
|
* This is only intended to be called before close, if the file is
|
|
* open for writing and the actual size does not match the calculated
|
|
* size, perhaps as the result of having been previously written in
|
|
* NOFILL mode.
|
|
*/
|
|
int
|
|
ncio_pad_length(ncio *nciop, off_t length)
|
|
{
|
|
int status = ENOERR;
|
|
FILE* f;
|
|
|
|
if(nciop == NULL)
|
|
return EINVAL;
|
|
|
|
f = descriptors[nciop->fd];
|
|
|
|
if(!fIsSet(nciop->ioflags, NC_WRITE))
|
|
return EPERM; /* attempt to write readonly file */
|
|
|
|
status = nciop->sync(nciop);
|
|
if(status != ENOERR)
|
|
return status;
|
|
|
|
status = fgrow2(f, length);
|
|
if(status != ENOERR)
|
|
return errno;
|
|
return ENOERR;
|
|
}
|
|
|
|
|
|
int
|
|
ncio_close(ncio *nciop, int doUnlink)
|
|
{
|
|
int status = ENOERR;
|
|
FILE* f;
|
|
|
|
if(nciop == NULL)
|
|
return EINVAL;
|
|
|
|
f = descriptors[nciop->fd];
|
|
|
|
nciop->sync(nciop);
|
|
|
|
(void) fclose(f);
|
|
|
|
descriptors[nciop->fd] = NULL;
|
|
|
|
if(doUnlink)
|
|
(void) unlink(nciop->path);
|
|
|
|
ncio_free(nciop);
|
|
|
|
return status;
|
|
}
|