/*      $NetBSD: hfs_subr.c,v 1.19 2015/06/21 13:43:58 maxv Exp $       */

/*-
* Copyright (c) 2005, 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Yevgeny Binder and Dieter Baron.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: hfs_subr.c,v 1.19 2015/06/21 13:43:58 maxv Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/mount.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/kauth.h>
#include <sys/buf.h>

#include <fs/hfs/hfs.h>

#include <miscfs/specfs/specdev.h>

/*
* Initialize the vnode associated with a new hfsnode.
*/
void
hfs_vinit(struct mount *mp, int (**specops)(void *), int (**fifoops)(void *),
          struct vnode **vpp)
{
       struct hfsnode  *hp;
       struct vnode    *vp;

       vp = *vpp;
       hp = VTOH(vp);

       vp->v_type = hfs_catalog_keyed_record_vtype(
               (hfs_catalog_keyed_record_t *)&hp->h_rec);

       switch(vp->v_type) {
               case VCHR:
               case VBLK:
                       vp->v_op = specops;
                       spec_node_init(vp,
                           HFS_CONVERT_RDEV(hp->h_rec.file.bsd.special.raw_device));
                       break;
               case VFIFO:
                       vp->v_op = fifoops;
                       break;

               case VNON:
               case VBAD:
               case VSOCK:
               case VDIR:
               case VREG:
               case VLNK:
                       break;
       }

       if (hp->h_rec.u.cnid == HFS_CNID_ROOT_FOLDER)
               vp->v_vflag |= VV_ROOT;

       *vpp = vp;
}

/*
* Callbacks for libhfs
*/

void
hfs_libcb_error(
       const char* format,
       const char* file,
       int line,
       va_list args)
{
#ifdef HFS_DEBUG
       if (file != NULL)
               printf("%s:%i: ", file, line);
       else
               printf("hfs: ");
#else
       printf("hfs: ");
#endif

       /* XXX Should we really display this if debugging is off? */
       vprintf(format, args);
       printf("\n");
}

/* XXX change malloc/realloc/free to use pools */

void*
hfs_libcb_malloc(size_t size, hfs_callback_args* cbargs)
{
       return malloc(size, /*M_HFSMNT*/ M_TEMP, M_WAITOK);
}

void*
hfs_libcb_realloc(void* ptr, size_t size, hfs_callback_args* cbargs)
{
       return realloc(ptr, size, /*M_HFSMNT*/ M_TEMP, M_WAITOK);
}

void
hfs_libcb_free(void* ptr, hfs_callback_args* cbargs)
{
       free(ptr, /*M_HFSMNT*/ M_TEMP);
}

/*
* hfs_libcb_opendev()
*
* hfslib uses this callback to open a volume's device node by name. However,
* by the time this is called here, the device node has already been opened by
* VFS. So we are passed the vnode to this volume's block device and use that
* instead of the device's name.
*/
int
hfs_libcb_opendev(
       hfs_volume* vol,
       const char* devname,
       hfs_callback_args* cbargs)
{
       hfs_libcb_data* cbdata = NULL;
       hfs_libcb_argsopen* args;
       int result, mode;
       uint64_t psize;
       unsigned secsize;

       result = 0;
       args = (hfs_libcb_argsopen*)(cbargs->openvol);

       if (vol == NULL || devname == NULL) {
               result = EINVAL;
               goto error;
       }

       cbdata = malloc(sizeof(hfs_libcb_data), M_HFSMNT, M_WAITOK);
       if (cbdata == NULL) {
               result = ENOMEM;
               goto error;
       }
       vol->cbdata = cbdata;

       cbdata->devvp = NULL;

       /* Open the device node. */
       mode = vol->readonly ? FREAD : FREAD|FWRITE;
       vn_lock(args->devvp, LK_EXCLUSIVE | LK_RETRY);
       result = VOP_OPEN(args->devvp, mode, FSCRED);
       VOP_UNLOCK(args->devvp);
       if (result != 0)
               goto error;

       /* Flush out any old buffers remaining from a previous use. */
       vn_lock(args->devvp, LK_EXCLUSIVE | LK_RETRY);
       result = vinvalbuf(args->devvp, V_SAVE, args->cred, args->l, 0, 0);
       VOP_UNLOCK(args->devvp);
       if (result != 0) {
               VOP_CLOSE(args->devvp, mode, FSCRED);
               goto error;
       }

       cbdata->devvp = args->devvp;

       /* Determine the device's block size. Default to DEV_BSIZE if unavailable.*/
       if (getdisksize(args->devvp, &psize, &secsize) != 0)
               cbdata->devblksz = DEV_BSIZE;
       else
               cbdata->devblksz = secsize;

       return 0;

error:
       if (cbdata != NULL) {
               if (cbdata->devvp != NULL) {
                       vn_lock(cbdata->devvp, LK_EXCLUSIVE | LK_RETRY);
                       (void)VOP_CLOSE(cbdata->devvp, vol->readonly ? FREAD :
                               FREAD | FWRITE, NOCRED);
                       VOP_UNLOCK(cbdata->devvp);
               }
               free(cbdata, M_HFSMNT);
               vol->cbdata = NULL;
       }

       return result;
}

void
hfs_libcb_closedev(hfs_volume* in_vol, hfs_callback_args* cbargs)
{
       struct vnode *devvp;

       if (in_vol == NULL)
               return;

       if (in_vol->cbdata != NULL) {
               devvp = ((hfs_libcb_data*)in_vol->cbdata)->devvp;
               if (devvp != NULL) {
                       vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
                       (void)VOP_CLOSE(devvp,
                           in_vol->readonly ? FREAD : FREAD | FWRITE, NOCRED);
                       VOP_UNLOCK(devvp);
               }

               free(in_vol->cbdata, M_HFSMNT);
               in_vol->cbdata = NULL;
       }
}

int
hfs_libcb_read(
       hfs_volume* vol,
       void* outbytes,
       uint64_t length,
       uint64_t offset,
       hfs_callback_args* cbargs)
{
       hfs_libcb_data *cbdata;
       hfs_libcb_argsread* argsread;
       kauth_cred_t cred;
       uint64_t physoffset; /* physical offset from start of device(?) */

       if (vol == NULL || outbytes == NULL)
               return -1;

       cbdata = (hfs_libcb_data*)vol->cbdata;

       if (cbargs != NULL
               && (argsread = (hfs_libcb_argsread*)cbargs->read) != NULL
               && argsread->cred != NULL)
               cred = argsread->cred;
       else
               cred = NOCRED;

       /*
        * Since bread() only reads data in terms of integral blocks, it may have
        * read some data before and/or after our desired offset & length. So when
        * copying that data into the outgoing buffer, start at the actual desired
        * offset and only copy the desired length.
        */
       physoffset = offset + vol->offset;

       return hfs_pread(cbdata->devvp, outbytes, cbdata->devblksz, physoffset,
                       length, cred);
}

/*
* So it turns out that bread() is pretty shoddy. It not only requires the size
* parameter to be an integral multiple of the device's block size, but also
* requires the block number to be on a boundary of that same block size -- and
* yet be given as an integral multiple of DEV_BSIZE! So after much toil and
* bloodshed, hfs_pread() was written as a convenience (and a model of how sane
* people take their bread()). Returns 0 on success.
*/
int
hfs_pread(struct vnode *vp, void *buf, size_t secsz, uint64_t off,
       uint64_t len, kauth_cred_t cred)
{
       struct buf *bp;
       uint64_t curoff; /* relative to 'start' variable */
       uint64_t start;
       int error;

       if (vp == NULL || buf == NULL)
               return EINVAL;

       if (len == 0)
               return 0;

       curoff = 0;
       error = 0;

/* align offset to highest preceding sector boundary */
#define ABSZ(x, bsz) (((x)/(bsz))*(bsz))

/* round size up to integral # of block sizes */
#define RBSZ(x, bsz) (((x) + (bsz) - 1) & ~((bsz) - 1))

       start = ABSZ(off, secsz);
       while (start + curoff < off + len)
       {
               bp = NULL;

               /* XXX  Does the algorithm always do what's intended here when
                * XXX  start != off? Need to test this. */

               error = bread(vp, (start + curoff) / DEV_BSIZE,/* no rounding involved*/
                  RBSZ(min(len - curoff + (off - start), MAXBSIZE), secsz),
                  0, &bp);

               if (error == 0)
                       memcpy((uint8_t*)buf + curoff, (uint8_t*)bp->b_data +
                               (off - start), min(len - curoff, MAXBSIZE - (off - start)));

               if (bp != NULL)
                       brelse(bp, 0);
               if (error != 0)
                       return error;

               curoff += MAXBSIZE;
       }
#undef ABSZ
#undef RBSZ

       return 0;
}

/* XXX Provide a routine to take a catalog record and return its proper BSD file
* XXX or directory mode value */


/* Convert from HFS+ time representation to UNIX time since epoch. */
void
hfs_time_to_timespec(uint32_t hfstime, struct timespec *unixtime)
{
       /*
        * HFS+ time is calculated in seconds since midnight, Jan 1st, 1904.
        * struct timespec counts from midnight, Jan 1st, 1970. Thus, there is
        * precisely a 66 year difference between them, which is equal to
        * 2,082,844,800 seconds. No, I didn't count them by hand.
        */

       if (hfstime < 2082844800)
               unixtime->tv_sec = 0; /* dates before 1970 are bs anyway, so use epoch*/
       else
               unixtime->tv_sec = hfstime - 2082844800;

       unixtime->tv_nsec = 0; /* we don't have nanosecond resolution */
}

/*
* Endian conversion with automatic pointer incrementation.
*/

uint16_t be16tohp(void** inout_ptr)
{
       uint16_t        result;

       if (inout_ptr == NULL)
               return 0;

       memcpy(&result, *inout_ptr, sizeof(result));
       *inout_ptr = (char *)*inout_ptr + sizeof(result);
       return be16toh(result);
}

uint32_t be32tohp(void** inout_ptr)
{
       uint32_t        result;

       if (inout_ptr == NULL)
               return 0;

       memcpy(&result, *inout_ptr, sizeof(result));
       *inout_ptr = (char *)*inout_ptr + sizeof(result);
       return be32toh(result);
}

uint64_t be64tohp(void** inout_ptr)
{
       uint64_t        result;

       if (inout_ptr == NULL)
               return 0;

       memcpy(&result, *inout_ptr, sizeof(result));
       *inout_ptr = (char *)*inout_ptr + sizeof(result);
       return be64toh(result);
}

enum vtype
hfs_catalog_keyed_record_vtype(const hfs_catalog_keyed_record_t *rec)
{
       if (rec->type == HFS_REC_FILE) {
               uint32_t mode;

               mode = ((const hfs_file_record_t *)rec)->bsd.file_mode;
               if (mode != 0)
                       return IFTOVT(mode);
               else
                       return VREG;
       } else
               return VDIR;
}

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