rbutil/ipodpatcher/ipodio-win32.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006-2007 Dave Chapman
  11  *
  12  * error(), lock_volume() and unlock_volume() functions and inspiration taken
  13  * from:
  14  *       RawDisk - Direct Disk Read/Write Access for NT/2000/XP
  15  *       Copyright (c) 2003 Jan Kiszka
  16  *       http://www.stud.uni-hannover.de/user/73174/RawDisk/
  17  *
  18  * This program is free software; you can redistribute it and/or
  19  * modify it under the terms of the GNU General Public License
  20  * as published by the Free Software Foundation; either version 2
  21  * of the License, or (at your option) any later version.
  22  *
  23  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  24  * KIND, either express or implied.
  25  *
  26  ****************************************************************************/
  27
  28 #include <stdio.h>
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #ifdef __WIN32__
  36 #include <windows.h>
  37 #include <winioctl.h>
  38 #endif
  39
  40 #include "ipodio.h"
  41
  42 static int lock_volume(HANDLE hDisk)
  43 {
  44   DWORD dummy;
  45
  46   return DeviceIoControl(hDisk, FSCTL_LOCK_VOLUME, NULL, 0, NULL, 0,
  47                          &dummy, NULL);
  48 }
  49
  50 static int unlock_volume(HANDLE hDisk)
  51 {
  52   DWORD dummy;
  53
  54   return DeviceIoControl(hDisk, FSCTL_UNLOCK_VOLUME, NULL, 0, NULL, 0,
  55                          &dummy, NULL);
  56 }
  57
  58 void print_error(char* msg)
  59 {
  60     char* pMsgBuf;
  61
  62     printf(msg);
  63     FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
  64                   FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(),
  65                   MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&pMsgBuf,
  66                   0, NULL);
  67     printf(pMsgBuf);
  68     LocalFree(pMsgBuf);
  69 }
  70
  71 int ipod_open(struct ipod_t* ipod, int silent)
  72 {
  73     DISK_GEOMETRY_EX diskgeometry_ex;
  74     DISK_GEOMETRY diskgeometry;
  75     unsigned long n;
  76
  77     ipod->dh = CreateFileA(ipod->diskname, GENERIC_READ,
  78                     FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
  79                     FILE_FLAG_WRITE_THROUGH | FILE_FLAG_NO_BUFFERING, NULL);
  80
  81     if (ipod->dh == INVALID_HANDLE_VALUE) {
  82         if (!silent) print_error(" Error opening disk: ");
  83         if(GetLastError() == ERROR_ACCESS_DENIED)
  84             return -2;
  85         else
  86             return -1;
  87     }
  88
  89     if (!lock_volume(ipod->dh)) {
  90         if (!silent) print_error(" Error locking disk: ");
  91         return -1;
  92     }
  93
  94     /* Defaults */
  95     ipod->num_heads = 0;
  96     ipod->sectors_per_track = 0;
  97
  98     if (!DeviceIoControl(ipod->dh,
  99                          IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 100                          NULL,
 101                          0,
 102                          &diskgeometry_ex,
 103                          sizeof(diskgeometry_ex),
 104                          &n,
 105                          NULL)) {
 106         if (!DeviceIoControl(ipod->dh,
 107                              IOCTL_DISK_GET_DRIVE_GEOMETRY,
 108                              NULL,
 109                              0,
 110                              &diskgeometry,
 111                              sizeof(diskgeometry),
 112                              &n,
 113                              NULL)) {
 114             if (!silent) print_error(" Error reading disk geometry: ");
 115             return -1;
 116         } else {
 117             ipod->sector_size = diskgeometry.BytesPerSector;
 118             ipod->num_heads = diskgeometry.TracksPerCylinder;
 119             ipod->sectors_per_track = diskgeometry.SectorsPerTrack;
 120         }
 121     } else {
 122         ipod->sector_size = diskgeometry_ex.Geometry.BytesPerSector;
 123         ipod->num_heads = diskgeometry_ex.Geometry.TracksPerCylinder;
 124         ipod->sectors_per_track = diskgeometry_ex.Geometry.SectorsPerTrack;
 125     }
 126
 127     return 0;
 128 }
 129
 130 int ipod_reopen_rw(struct ipod_t* ipod)
 131 {
 132     /* Close existing file and re-open for writing */
 133     unlock_volume(ipod->dh);
 134     CloseHandle(ipod->dh);
 135
 136     ipod->dh = CreateFileA(ipod->diskname, GENERIC_READ | GENERIC_WRITE,
 137                      FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 138                      FILE_FLAG_WRITE_THROUGH | FILE_FLAG_NO_BUFFERING, NULL);
 139
 140     if (ipod->dh == INVALID_HANDLE_VALUE) {
 141         print_error(" Error opening disk: ");
 142         return -1;
 143     }
 144
 145     if (!lock_volume(ipod->dh)) {
 146         print_error(" Error locking disk: ");
 147         return -1;
 148     }
 149
 150     return 0;
 151 }
 152
 153 int ipod_close(struct ipod_t* ipod)
 154 {
 155     unlock_volume(ipod->dh);
 156     CloseHandle(ipod->dh);
 157     return 0;
 158 }
 159
 160 int ipod_alloc_buffer(unsigned char** sectorbuf, int bufsize)
 161 {
 162     /* The ReadFile function requires a memory buffer aligned to a multiple of
 163        the disk sector size. */
 164     *sectorbuf = (unsigned char*)VirtualAlloc(NULL, bufsize, MEM_COMMIT, PAGE_READWRITE);
 165     if (*sectorbuf == NULL) {
 166         print_error(" Error allocating a buffer: ");
 167         return -1;
 168     }
 169     return 0;
 170 }
 171
 172 int ipod_seek(struct ipod_t* ipod, unsigned long pos)
 173 {
 174     if (SetFilePointer(ipod->dh, pos, NULL, FILE_BEGIN)==0xffffffff) {
 175         print_error(" Seek error ");
 176         return -1;
 177     }
 178     return 0;
 179 }
 180
 181 ssize_t ipod_read(struct ipod_t* ipod, unsigned char* buf, int nbytes)
 182 {
 183     unsigned long count;
 184
 185     if (!ReadFile(ipod->dh, buf, nbytes, &count, NULL)) {
 186         print_error(" Error reading from disk: ");
 187         return -1;
 188     }
 189
 190     return count;
 191 }
 192
 193 ssize_t ipod_write(struct ipod_t* ipod, unsigned char* buf, int nbytes)
 194 {
 195     unsigned long count;
 196
 197     if (!WriteFile(ipod->dh, buf, nbytes, &count, NULL)) {
 198         print_error(" Error writing to disk: ");
 199         return -1;
 200     }
 201
 202     return count;
 203 }