Initial commit of sansapatcher - an installation tool for the Sansa E200.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12792 a1c6a512-1295-4272-9138-f99709370657

rbutil/sansapatcher/sansaio-win32.c

@@ -0,0 +1,196 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: ipodio-win32.c 12263 2007-02-10 19:49:43Z dave $
+ *
+ * Copyright (C) 2006-2007 Dave Chapman
+ *
+ * error(), lock_volume() and unlock_volume() functions and inspiration taken
+ * from:
+ *       RawDisk - Direct Disk Read/Write Access for NT/2000/XP
+ *       Copyright (c) 2003 Jan Kiszka
+ *       http://www.stud.uni-hannover.de/user/73174/RawDisk/
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef __WIN32__
+#include <windows.h>
+#include <winioctl.h>
+#endif
+
+#include "sansaio.h"
+
+static int lock_volume(HANDLE hDisk) 
+{ 
+  DWORD dummy;
+
+  return DeviceIoControl(hDisk, FSCTL_LOCK_VOLUME, NULL, 0, NULL, 0,
+			 &dummy, NULL); 
+}
+
+static int unlock_volume(HANDLE hDisk) 
+{ 
+  DWORD dummy;
+
+  return DeviceIoControl(hDisk, FSCTL_UNLOCK_VOLUME, NULL, 0, NULL, 0,
+			 &dummy, NULL); 
+} 
+
+void print_error(char* msg)
+{
+    char* pMsgBuf;
+
+    printf(msg);
+    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
+                  FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(),
+                  MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&pMsgBuf,
+                  0, NULL);
+    printf(pMsgBuf);
+    LocalFree(pMsgBuf);
+}
+
+int sansa_open(struct sansa_t* sansa, int silent)
+{
+    DISK_GEOMETRY_EX diskgeometry_ex;
+    DISK_GEOMETRY diskgeometry;
+    unsigned long n;
+
+    sansa->dh = CreateFile(sansa->diskname, GENERIC_READ,
+                    FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
+                    FILE_FLAG_WRITE_THROUGH | FILE_FLAG_NO_BUFFERING, NULL);
+
+    if (sansa->dh == INVALID_HANDLE_VALUE) {
+        if (!silent) print_error(" Error opening disk: ");
+        return -1;
+    }
+
+    if (!lock_volume(sansa->dh)) {
+        if (!silent) print_error(" Error locking disk: ");
+        return -1;
+    }
+
+    if (!DeviceIoControl(sansa->dh,
+                         IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
+                         NULL,
+                         0,
+                         &diskgeometry_ex,
+                         sizeof(diskgeometry_ex),
+                         &n,
+                         NULL)) {
+        if (!DeviceIoControl(sansa->dh,
+                             IOCTL_DISK_GET_DRIVE_GEOMETRY,
+                             NULL,
+                             0,
+                             &diskgeometry,
+                             sizeof(diskgeometry),
+                             &n,
+                             NULL)) {
+            if (!silent) print_error(" Error reading disk geometry: ");
+            return -1;
+        } else {
+            sansa->sector_size=diskgeometry.BytesPerSector;
+        }
+    } else {
+        sansa->sector_size=diskgeometry_ex.Geometry.BytesPerSector;
+    }
+
+    return 0;
+}
+
+int sansa_reopen_rw(struct sansa_t* sansa)
+{
+    /* Close existing file and re-open for writing */
+    unlock_volume(sansa->dh);
+    CloseHandle(sansa->dh);
+
+    sansa->dh = CreateFile(sansa->diskname, GENERIC_READ | GENERIC_WRITE,
+                     FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
+                     FILE_FLAG_WRITE_THROUGH | FILE_FLAG_NO_BUFFERING, NULL);
+
+    if (sansa->dh == INVALID_HANDLE_VALUE) {
+        print_error(" Error opening disk: ");
+        return -1;
+    }
+
+    if (!lock_volume(sansa->dh)) {
+        print_error(" Error locking disk: ");
+        return -1;
+    }
+
+    return 0;
+}
+
+int sansa_close(struct sansa_t* sansa)
+{
+    unlock_volume(sansa->dh);
+    CloseHandle(sansa->dh);
+    return 0;
+}
+
+int sansa_alloc_buffer(unsigned char** sectorbuf, int bufsize)
+{
+    /* The ReadFile function requires a memory buffer aligned to a multiple of
+       the disk sector size. */
+    *sectorbuf = (unsigned char*)VirtualAlloc(NULL, bufsize, MEM_COMMIT, PAGE_READWRITE);
+    if (*sectorbuf == NULL) {
+        print_error(" Error allocating a buffer: ");
+        return -1;
+    }
+    return 0;
+}
+
+int sansa_seek(struct sansa_t* sansa, loff_t pos)
+{
+    LARGE_INTEGER li;
+
+    li.QuadPart = pos;
+
+    li.LowPart = SetFilePointer (sansa->dh, li.LowPart, &li.HighPart, FILE_BEGIN);
+
+    if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
+        print_error(" Seek error ");
+        return -1;
+    }
+    return 0;
+}
+
+int sansa_read(struct sansa_t* sansa, unsigned char* buf, int nbytes)
+{
+    unsigned long count;
+
+    if (!ReadFile(sansa->dh, buf, nbytes, &count, NULL)) {
+        print_error(" Error reading from disk: ");
+        return -1;
+    }
+
+    return count;
+}
+
+int sansa_write(struct sansa_t* sansa, unsigned char* buf, int nbytes)
+{
+    unsigned long count;
+
+    if (!WriteFile(sansa->dh, buf, nbytes, &count, NULL)) {
+        print_error(" Error writing to disk: ");
+        return -1;
+    }
+
+    return count;
+}