[misc] separated ms-sys dependency from application

* set ms-sys to be built as a library
* also removed unused code from badblocks.c

src/ms-sys/file.c

@@ -0,0 +1,140 @@
+/******************************************************************
+    Copyright (C) 2009  Henrik Carlqvist
+    Modified for Rufus/Windows (C) 2011-2012  Pete Batard
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+******************************************************************/
+#include <stdio.h>
+#include <string.h>
+
+#include "../rufus.h"
+#include "file.h"
+
+/* Returns the number of bytes written or -1 on error */
+int write_sectors(HANDLE hDrive, size_t SectorSize,
+                  size_t StartSector, size_t nSectors,
+                  const void *pBuf)
+{
+   LARGE_INTEGER ptr;
+   DWORD Size = (DWORD)(nSectors*SectorSize);
+
+   ptr.QuadPart = StartSector*SectorSize;
+   if(!SetFilePointerEx(hDrive, ptr, NULL, FILE_BEGIN))
+   {
+      uprintf("write_sectors: Could not access sector %d - %s\n", StartSector, WindowsErrorString());
+      return -1;
+   }
+
+   if((!WriteFile(hDrive, pBuf, Size, &Size, NULL)) || (Size != nSectors*SectorSize))
+   {
+      uprintf("write_sectors: Write error - %s\n", WindowsErrorString());
+      uprintf("  StartSector:%0X, nSectors:%0X, SectorSize:%0X\n", StartSector, nSectors, SectorSize);
+      return Size;
+   }
+
+   return Size;
+}
+
+/* Returns the number of bytes read or -1 on error */
+int read_sectors(HANDLE hDrive, size_t SectorSize,
+                 size_t StartSector, size_t nSectors,
+                 void *pBuf)
+{
+   LARGE_INTEGER ptr;
+   DWORD Size = (DWORD)(nSectors*SectorSize);
+
+   ptr.QuadPart = StartSector*SectorSize;
+   if(!SetFilePointerEx(hDrive, ptr, NULL, FILE_BEGIN))
+   {
+      uprintf("read_sectors: Could not access sector %d - %s\n", StartSector, WindowsErrorString());
+      return -1;
+   }
+
+   if((!ReadFile(hDrive, pBuf, Size, &Size, NULL)) || (Size != nSectors*SectorSize))
+   {
+      uprintf("read_sectors: Read error - %s\n", WindowsErrorString());
+      uprintf("  StartSector:%0X, nSectors:%0X, SectorSize:%0X\n", StartSector, nSectors, SectorSize);
+   }
+
+   return Size;
+}
+
+/*
+ * The following calls use a bastardized fp on Windows that contains:
+ * fp->_ptr: a Windows handle
+ * fp->_bufsiz: the sector size
+ * fp->_cnt: a file offset
+ */
+int contains_data(FILE *fp, size_t Position,
+                  const void *pData, size_t Len)
+{
+   unsigned char aucBuf[MAX_DATA_LEN];
+   HANDLE hDrive = (HANDLE)fp->_ptr;
+   size_t SectorSize = (size_t)fp->_bufsiz;
+   size_t StartSector, EndSector, NumSectors;
+   Position += (size_t)fp->_cnt;
+
+   StartSector = Position/SectorSize;
+   EndSector   = (Position+Len+SectorSize-1)/SectorSize;
+   NumSectors  = EndSector - StartSector;
+
+   if((NumSectors*SectorSize) > MAX_DATA_LEN)
+   {
+      uprintf("Please increase MAX_DATA_LEN in file.h\n");
+      return 0;
+   }
+
+   if(read_sectors(hDrive, SectorSize, StartSector,
+                     NumSectors, aucBuf) <= 0)
+      return 0;
+
+   if(memcmp(pData, &aucBuf[Position - StartSector*SectorSize], Len))
+      return 0;
+   return 1;
+} /* contains_data */
+
+/* May read/write the same sector many times, but compatible with existing ms-sys */
+int write_data(FILE *fp, size_t Position,
+               const void *pData, size_t Len)
+{
+   unsigned char aucBuf[MAX_DATA_LEN];
+   HANDLE hDrive = (HANDLE)fp->_ptr;
+   size_t SectorSize = (size_t)fp->_bufsiz;
+   size_t StartSector, EndSector, NumSectors;
+   Position += (size_t)fp->_cnt;
+
+   StartSector = Position/SectorSize;
+   EndSector   = (Position+Len+SectorSize-1)/SectorSize;
+   NumSectors  = EndSector - StartSector;
+
+   if((NumSectors*SectorSize) > MAX_DATA_LEN)
+   {
+      uprintf("Please increase MAX_DATA_LEN in file.h\n");
+      return 0;
+   }
+
+   /* Data to write may not be aligned on a sector boundary => read into a sector buffer first */
+   if(read_sectors(hDrive, SectorSize, StartSector,
+                     NumSectors, aucBuf) <= 0)
+      return 0;
+
+   if(!memcpy(&aucBuf[Position - StartSector*SectorSize], pData, Len))
+      return 0;
+
+   if(write_sectors(hDrive, SectorSize, StartSector,
+                     NumSectors, aucBuf) <= 0)
+      return 0;
+   return 1;
+} /* write_data */