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As a more complicated example of PInvoke usage, this section shows you how to benefit from memory mapping into F# programs. Memory mapping is a popular technique that allows a program to see a file (or a portion of a file) as if it was in memory. This provides an efficient way to access files, because the operating system uses the machinery of virtual memory to access files and significantly speed up data access on files. After proper initialization, which is covered in a moment, the program obtains a pointer into the memory, and access to that portion of memory appears the same as accessing data stored into the file. You can use memory mapping to both read and write files. Every access performed to memory is reflected in the corresponding position in the file. This is a typical sequence of system calls in order to map a file into memory: 1. 2. 3. A call to the CreateFile system call to open the file and obtain a handle to the file. A call to the CreateFileMapping system call to create a mapped file object. One or more calls to MapViewOfFile and UnmapViewOfFile to map and release portions of a file into memory. In a typical usage, the whole file is mapped at once in memory. A call to CloseHandle to release the file.

To define the types of files you want the Salvage operation to find, click the Supported File Formats button. This opens the File Types to Include window (see Figure 19 16). From here, hold down the Command key and select all the file types you want to find. To continue with the example from the Search section, we ll look for all Adobe files. Next, click Continue and then click the Salvage selected files button from the Salvage window.

If you want to get calendar events into or out of Google Calendar, click the Settings link in the upper-right corner or use the link just under the My calendars list. You ll see a link in the Calendars tab for importing and exporting calendars. Google uses iCal format to export, and it can import iCal or CSV, which is Microsoft Outlook format.

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The PInvoke interface to the required functions involves simple type mappings as is usual for Win32 API functions. All the functions are in kernel32.dll, and the signature can be found in the Windows SDK. Listing 17-1 contains the definition of the F# wrapper for memory mapping. The SetLastError parameter informs the runtime that the called function uses the Windows mechanism for error reporting and that the GetLastError function can be read in case of error; otherwise, the CLR ignores such a value. The CharSet parameter indicates the character set assumed, and it s used to distinguish between ANSI and Unicode characters; with Auto, you delegate the runtime to decide the appropriate version. You can define the generic class MemMap that uses the functions to map a given file into memory. The goal of the class is to provide access to memory mapping in a system where memory isn t directly accessible because the runtime is responsible for its management. A natural programming abstraction to expose the memory to F# code is to provide an array-like interface where the memory is seen as a homogeneous array of values. Listing 17-1. Exposing Memory Mapping in F# module MMap = open open open open open System System.IO System.Runtime.InteropServices Microsoft.FSharp.NativeInterop Printf

Once the Salvage operation is complete, you will see a listing of all salvaged files in the Found screen. In many cases, salvaged files will lose their names but not their contents in this process. Other applications can perform salvage operations, such as FileSalvage (also by SubRosaSoft), MacDataRecovery, and, our favorite, Data Rescue II from ProSoft. Although these tools are helpful, it is important to keep as much information logged about the case in the MacForensicsLab case notes as possible. Whenever possible, it is preferable to use a forensics tool before using any nonforensics tools to keep all the actions logged, preventing future allegations of evidence tampering.

type HANDLE = nativeint type ADDR = nativeint [<DllImport("kernel32", SetLastError=true)>] extern bool CloseHandle(HANDLE handler) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE CreateFile(string lpFileName, int dwDesiredAccess, int dwShareMode, HANDLE lpSecurityAttributes, int dwCreationDisposition, int dwFlagsAndAttributes, HANDLE hTemplateFile) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE CreateFileMapping(HANDLE hFile, HANDLE lpAttributes, int flProtect, int dwMaximumSizeLow, int dwMaximumSizeHigh, string lpName) [<DllImport("kernel32", SetLastError=true)>] extern ADDR MapViewOfFile(HANDLE hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh, int dwFileOffsetLow, int dwNumBytesToMap) [<DllImport("kernel32", SetLastError=true, CharSet=CharSet.Auto)>] extern HANDLE OpenFileMapping(int dwDesiredAccess, bool bInheritHandle, string lpName) [<DllImport("kernel32", SetLastError=true)>] extern bool UnmapViewOfFile(ADDR lpBaseAddress) let let let let let let let let let let let let INVALID_HANDLE = new IntPtr(-1) MAP_READ = 0x0004 GENERIC_READ = 0x80000000 NULL_HANDLE = IntPtr.Zero FILE_SHARE_NONE = 0x0000 FILE_SHARE_READ = 0x0001 FILE_SHARE_WRITE = 0x0002 FILE_SHARE_READ_WRITE = 0x0003 CREATE_ALWAYS = 0x0002 OPEN_EXISTING = 0x0003 OPEN_ALWAYS = 0x0004 READONLY = 0x00000002

type MemMap<'a> (fileName) =

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