/*      $NetBSD: winblk.c,v 1.10 2023/07/15 21:41:25 andvar Exp $       */

/*-
* Copyright (c) 1999 Shin Takemura.
* All rights reserved.
*
* This software is part of the PocketBSD.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the PocketBSD project
*      and its contributors.
* 4. Neither the name of the project nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
*/
#define STANDALONE_WINDOWS_SIDE
#include <stand.h>
#include <winblk.h>
#include <winioctl.h>
#include <sys/disklabel.h>
#include "diskio.h"

/*
* BOOL
* DeviceIoControl(HANDLE hDevice, DWORD dwIoControlCode,
*                      LPVOID lpInBuffer, DWORD nInBufferSize,
*                      LPVOID lpOutBuffer, DWORD nOutBufferSize,
*                      LPDWORD lpBytesReturned,
*                      LPOVERLAPPED lpOverlapped);
*/

#ifdef DEBUG
#define DEBUG_PRINTF(a) win_printf a
#else
#define DEBUG_PRINTF(a)
#endif

#define islower(c)      ('a' <= (c) && (c) <= 'z')
#define toupper(c)      (islower(c) ? ((c) - 'a' + 'A') : (c))

#define BLKSZ   512

struct winblk {
       HANDLE  hDevice;
       DISK_INFO di;
       struct mbr_partition mbr[MBR_PART_COUNT];
       struct disklabel dl;
       char buf[BLKSZ];
       int start;
};

static int rawread(struct winblk *ctx, int start, int nsecs, char *buf);

int
winblkstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize)
{
       struct winblk *ctx = (struct winblk*)devdata;
       int error;
       size_t nblks;

       if (flag != F_READ)
               return (EROFS);

       dblk += ctx->start;
       nblks = (size / BLKSZ);

       if (error = rawread(ctx, dblk, nblks, buf)) {
               return (error);
       }
       if (nblks * BLKSZ < size) {
               if (error = rawread(ctx, dblk + nblks, 1, ctx->buf)) {
                       return (error);
               }
               memcpy((BYTE*)buf + nblks * BLKSZ, ctx->buf,
                      size - nblks * BLKSZ);
       }

       if (rsize)
               *rsize = size;
       return (0);
}


int
winblkopen(struct open_file *f, ...)
/* file, devname, unit, partition */
{
       va_list ap;
       struct winblk *ctx = NULL;
       char *devname;
       int unit;
       int partition;
       TCHAR wdevname[6];
       DWORD wres;
       int i;
       int start_386bsd;

       int error = 0;

       ctx = (struct winblk *)alloc(sizeof(*ctx));
       if (!ctx) {
               error = ENOMEM;
               goto end;
       }
       f->f_devdata = ctx;

       va_start(ap, f);
       devname = va_arg(ap, char*);
       unit = va_arg(ap, int);
       partition = va_arg(ap, int);
       va_end(ap);

       /*
        *  Windows' device name must be 3 upper letters and 1 digit
        *  following a semicolon like "DSK1:".
        */
       if (strlen(devname) != 3 || unit < 0 || 9 < unit) {
               error = ENODEV;
               goto end;
       }
       wsprintf(wdevname, TEXT("%C%C%C%d:"),
               toupper(devname[0]),
               toupper(devname[1]),
               toupper(devname[2]),
               unit);
       DEBUG_PRINTF((TEXT("winblk.open: block device name is '%s'\n"),
                     wdevname));

       ctx->hDevice = CreateFile(wdevname, GENERIC_READ, 0, NULL,
                                 OPEN_EXISTING, 0, NULL);
       if (ctx->hDevice == INVALID_HANDLE_VALUE) {
               win_printf(TEXT("can't open %s.\n"), wdevname);
               error = ENODEV; /* XXX, We shuld check GetLastError(). */
               goto end;
       }

       /*
        *  get DISK_INFO
        *  CHS, sector size and device flags.
        */
       if (!DeviceIoControl(ctx->hDevice, DISK_IOCTL_GETINFO,
                            &ctx->di, sizeof(ctx->di),
                            NULL, 0, &wres, NULL)) {
               win_printf(TEXT("DeviceIoControl() failed.error=%d\n"),
                          GetLastError());

               error = EIO; /* XXX, We shuld check GetLastError(). */
               goto end;
       }

#ifdef DEBUG
       win_printf(TEXT("DISK_INFO: CHS=%d:%d:%d  block size=%d  flag="),
                  ctx->di.di_cylinders,
                  ctx->di.di_heads,
                  ctx->di.di_sectors,
                  ctx->di.di_bytes_per_sect);
       if (ctx->di.di_flags & DISK_INFO_FLAG_MBR) {
               win_printf(TEXT("MBR "));
       }
       if (ctx->di.di_flags & DISK_INFO_FLAG_CHS_UNCERTAIN) {
               win_printf(TEXT("CHS_UNCERTAIN "));
       }
       if (ctx->di.di_flags & DISK_INFO_FLAG_UNFORMATTED) {
               win_printf(TEXT("UNFORMATTED "));
       }
       if (ctx->di.di_flags & DISK_INFO_FLAG_PAGEABLE) {
               win_printf(TEXT("PAGEABLE "));
       }
       win_printf(TEXT("\n"));
#endif /* DEBUG */

       if (!(ctx->di.di_flags & DISK_INFO_FLAG_MBR) ||
            (ctx->di.di_flags & DISK_INFO_FLAG_CHS_UNCERTAIN) ||
            (ctx->di.di_flags & DISK_INFO_FLAG_UNFORMATTED) ||
            (ctx->di.di_bytes_per_sect != BLKSZ)) {
               win_printf(TEXT("invalid flags\n"));
               error = EINVAL;
               goto end;
       }

       /*
        *  read MBR
        */
       if (error = rawread(ctx, MBR_BBSECTOR, 1, ctx->buf)) {
               goto end;
       }
       memcpy(&ctx->mbr, &ctx->buf[MBR_PART_OFFSET], sizeof(ctx->mbr));

       for (i = 0; i < MBR_PART_COUNT; i++) {
               DEBUG_PRINTF((TEXT("%d: type=%d %d(%d) (%d:%d:%d - %d:%d:%d)")
                             TEXT(" flag=0x%02x\n"),
                             i,
                             ctx->mbr[i].mbrp_type,
                             ctx->mbr[i].mbrp_start,
                             ctx->mbr[i].mbrp_size,
                             ctx->mbr[i].mbrp_scyl,
                             ctx->mbr[i].mbrp_shd,
                             ctx->mbr[i].mbrp_ssect,
                             ctx->mbr[i].mbrp_ecyl,
                             ctx->mbr[i].mbrp_ehd,
                             ctx->mbr[i].mbrp_esect,
                             ctx->mbr[i].mbrp_flag));
       }

       /*
        *  find BSD partition
        */
       ctx->start = -1;
       start_386bsd = -1;
       for (i = 0; i < MBR_PART_COUNT; i++) {
               if (ctx->mbr[i].mbrp_type == MBR_PTYPE_NETBSD) {
                       ctx->start = ctx->mbr[i].mbrp_start;
                       break;
               }
               if (ctx->mbr[i].mbrp_type == MBR_PTYPE_386BSD) {
                       start_386bsd = ctx->mbr[i].mbrp_start;
               }
       }
       if (ctx->start == -1) {
               ctx->start = start_386bsd;
       }

       if (ctx->start == -1) {
               /*
                *  BSD partition is not found.
                *  Try to use entire disk.
                */
               ctx->start = 0;
               win_printf(TEXT("no BSD partition, start sector=0x%x\n"),
                          ctx->start);
               goto end;
       }

       /*
        *  read disklabel
        */
       if (error = rawread(ctx, ctx->start + LABELSECTOR, 1, ctx->buf)) {
               goto end;
       }
       memcpy(&ctx->dl, &ctx->buf[LABELOFFSET], sizeof(ctx->dl));

       if (ctx->dl.d_magic != DISKMAGIC ||
           ctx->dl.d_magic2 != DISKMAGIC ||
           dkcksum(&ctx->dl) != 0) {
               win_printf(TEXT("invalid disklabel, start sector=0x%x\n"),
                          ctx->start);
               /*
                *  Disklabel is not found.
                *  Try to use entire partition.
                */
               goto end;
       }

       if (partition < 0 || ctx->dl.d_npartitions <= partition) {
               error = EINVAL;
               goto end;
       }

       ctx->start = ctx->dl.d_partitions[partition].p_offset;
       win_printf(TEXT("start sector=0x%x\n"), ctx->start);

     end:
       if (error && ctx) {
               dealloc(ctx, sizeof(*ctx));
               f->f_devdata = NULL;
       }
       return (error);
}

int
winblkclose(struct open_file *f)
{
       struct winblk *ctx = f->f_devdata;

       dealloc(ctx, sizeof(*ctx));

       f->f_devdata = NULL;
       return (0);
}

int
winblkioctl(struct open_file *f, u_long cmd, void *arg)
{
       return EIO;
}

static int
rawread(struct winblk *ctx, int start, int nsecs, char *buf)
{
       SG_REQ req;
       DWORD res;

       req.sr_start = start;
       req.sr_num_sec = nsecs;
       req.sr_num_sg = 1;
       req.sr_callback = NULL;
       req.sr_sglist[0].sb_buf = buf;
       req.sr_sglist[0].sb_len = nsecs * BLKSZ;

       DEBUG_PRINTF((TEXT("rawread(0x%x, %d)"), start, nsecs));
       if (!DeviceIoControl(ctx->hDevice, DISK_IOCTL_READ,
                            &req, sizeof(req),
                            NULL, 0, &res, NULL)) {
               win_printf(TEXT("DeviceIoControl() failed.error=%d\n"),
                          GetLastError());

               return (EIO); /* XXX, We shuld check GetLastError(). */
       }
       DEBUG_PRINTF((TEXT("=%d\n"), req.sr_status));

       if (req.sr_status != ERROR_SUCCESS) {
               win_printf(TEXT("DeviceIoControl(READ): status=%d\n"),
                          req.sr_status);
               return (EIO); /* XXX, We shuld check error code. */
       }

       return (0);
}

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