Ejemplo n.º 1
0
        private static SafeHeapBlockHandle ReadFileWorker(SlimFileInfo fileInfo, int trailingByteCount)
        {
            using (
                var fileHandle = NativeMethods.CreateFile(fileInfo.FullPathName.FullName, NativeAccessFlags.GenericRead, FileShare.Read, IntPtr.Zero,
                                                          FileMode.Open, 0, IntPtr.Zero)) {
                if (fileHandle.IsInvalid)
                {
                    throw new Win32Exception();
                }

                // Note: We are limited to 2GB files by design.
                var len       = (int)fileInfo.Length;
                var heap      = HeapAllocStatic.Alloc(len + trailingByteCount);
                var bytesRead = new int[1];

                if (!NativeMethods.ReadFile(fileHandle, heap.Pointer, len, bytesRead, null))
                {
                    throw new Win32Exception();
                }

                if (bytesRead[0] != len)
                {
                    throw new Exception("File read operation didn't read the whole file");
                }

                return(heap);
            }
        }
Ejemplo n.º 2
0
    private static SafeHeapBlockHandle ReadFileWorker(SlimFileInfo fileInfo, int trailingByteCount) {
      using (
        var fileHandle = NativeMethods.CreateFile(fileInfo.FullPath.Value, NativeAccessFlags.GenericRead, FileShare.Read, IntPtr.Zero,
                                                  FileMode.Open, 0, IntPtr.Zero)) {
        if (fileHandle.IsInvalid)
          throw new Win32Exception();

        // Note: We are limited to 2GB files by design.
        int maxLen = Int32.MaxValue - trailingByteCount;
        if (fileInfo.Length >= maxLen) {
          Logger.LogWarning("File too big, truncated to {0} bytes", maxLen);
        }
        var len = (int)Math.Min(maxLen, fileInfo.Length);
        var heap = HeapAllocStatic.Alloc(len + trailingByteCount);
        var bytesRead = new int[1];

        if (!NativeMethods.ReadFile(fileHandle, heap.Pointer, len, bytesRead, null))
          throw new Win32Exception();

        if (bytesRead[0] != len)
          throw new Exception("File read operation didn't read the whole file");

        return heap;
      }
    }
Ejemplo n.º 3
0
        private static SafeHeapBlockHandle ReadFileWorker(SlimFileInfo fileInfo, int trailingByteCount)
        {
            using (
                var fileHandle = NativeMethods.CreateFile(fileInfo.FullPath.Value, NativeAccessFlags.GenericRead, FileShare.Read, IntPtr.Zero,
                                                          FileMode.Open, 0, IntPtr.Zero)) {
                if (fileHandle.IsInvalid)
                {
                    throw new Win32Exception();
                }

                // Note: We are limited to 2GB files by design.
                int maxLen = Int32.MaxValue - trailingByteCount;
                if (fileInfo.Length >= maxLen)
                {
                    Logger.LogWarning("File too big, truncated to {0} bytes", maxLen);
                }
                var len       = (int)Math.Min(maxLen, fileInfo.Length);
                var heap      = HeapAllocStatic.Alloc(len + trailingByteCount);
                var bytesRead = new int[1];

                if (!NativeMethods.ReadFile(fileHandle, heap.Pointer, len, bytesRead, null))
                {
                    throw new Win32Exception();
                }

                if (bytesRead[0] != len)
                {
                    throw new Exception("File read operation didn't read the whole file");
                }

                return(heap);
            }
        }
        private FileContents ReadFile(FullPath fullName)
        {
            try {
            var fileInfo = new SlimFileInfo(fullName);
            const int trailingByteCount = 2;
            var block = NativeFile.ReadFileNulTerminated(fileInfo, trailingByteCount);
            var contentsByteCount = (int)block.ByteLength - trailingByteCount; // Padding added by ReadFileNulTerminated
            var kind = NativeMethods.Text_GetKind(block.Pointer, contentsByteCount);

            switch (kind) {
              case NativeMethods.TextKind.Ascii:
            return new AsciiFileContents(new FileContentsMemory(block, 0, contentsByteCount), fileInfo.LastWriteTimeUtc);

              case NativeMethods.TextKind.AsciiWithUtf8Bom:
            const int utf8BomSize = 3;
            return new AsciiFileContents(new FileContentsMemory(block, utf8BomSize, contentsByteCount - utf8BomSize), fileInfo.LastWriteTimeUtc);

              case NativeMethods.TextKind.Utf8WithBom:
            var utf16Block = Conversion.UTF8ToUnicode(block);
            block.Dispose();
            return new UTF16FileContents(new FileContentsMemory(utf16Block, 0, utf16Block.ByteLength), fileInfo.LastWriteTimeUtc);

              case NativeMethods.TextKind.Unknown:
              default:
            // TODO(rpaquay): Figure out a better way to detect encoding.
            //Logger.Log("Text Encoding of file \"{0}\" is not recognized.", fullName);
            return new AsciiFileContents(new FileContentsMemory(block, 0, contentsByteCount), fileInfo.LastWriteTimeUtc);
            //throw new NotImplementedException(string.Format("Text Encoding of file \"{0}\" is not recognized.", fullName));
            }
              }
              catch (Exception e) {
            Logger.LogException(e, "Error reading content of text file \"{0}\", skipping file.", fullName);
            return StringFileContents.Empty;
              }
        }
Ejemplo n.º 5
0
    /// <summary>
    /// Note: For testability, this function should be called through <see cref="IFileSystem"/>.
    /// </summary>
    public static SafeHeapBlockHandle ReadFileNulTerminated(SlimFileInfo fileInfo, int trailingByteCount) {
      var result = ReadFileWorker(fileInfo, trailingByteCount);

      var trailingPtr = result.Pointer.ToInt64() + result.ByteLength - trailingByteCount;
      for (var i = 0; i < trailingByteCount; i++) {
        Marshal.WriteByte(new IntPtr(trailingPtr + i), 0);
      }
      return result;
    }
Ejemplo n.º 6
0
        /// <summary>
        /// Note: For testability, this function should be called through <see cref="IFileSystem"/>.
        /// </summary>
        public static SafeHeapBlockHandle ReadFileNulTerminated(SlimFileInfo fileInfo, int trailingByteCount)
        {
            var result = ReadFileWorker(fileInfo, trailingByteCount);

            var trailingPtr = result.Pointer.ToInt64() + result.ByteLength - trailingByteCount;

            for (var i = 0; i < trailingByteCount; i++)
            {
                Marshal.WriteByte(new IntPtr(trailingPtr + i), 0);
            }
            return(result);
        }
Ejemplo n.º 7
0
        private static SafeHeapBlockHandle ReadFileWorker(SlimFileInfo fileInfo, int trailingByteCount)
        {
            using (
            var fileHandle = NativeMethods.CreateFile(fileInfo.FullPathName.FullName, NativeAccessFlags.GenericRead, FileShare.Read, IntPtr.Zero,
                                                  FileMode.Open, 0, IntPtr.Zero)) {
            if (fileHandle.IsInvalid)
              throw new Win32Exception();

            // Note: We are limited to 2GB files by design.
            var len = (int)fileInfo.Length;
            var heap = HeapAllocStatic.Alloc(len + trailingByteCount);
            var bytesRead = new int[1];

            if (!NativeMethods.ReadFile(fileHandle, heap.Pointer, len, bytesRead, null))
              throw new Win32Exception();

            if (bytesRead[0] != len)
              throw new Exception("File read operation didn't read the whole file");

            return heap;
              }
        }
Ejemplo n.º 8
0
 public FileInfoSnapshot(FullPath path) {
   _fileInfo = new SlimFileInfo(path);
 }