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Diffstat (limited to 'third_party/protobuf/3.6.0/csharp/src/Google.Protobuf/ByteArray.cs')
| -rw-r--r-- | third_party/protobuf/3.6.0/csharp/src/Google.Protobuf/ByteArray.cs | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/protobuf/3.6.0/csharp/src/Google.Protobuf/ByteArray.cs b/third_party/protobuf/3.6.0/csharp/src/Google.Protobuf/ByteArray.cs new file mode 100644 index 0000000000..b19962794b --- /dev/null +++ b/third_party/protobuf/3.6.0/csharp/src/Google.Protobuf/ByteArray.cs @@ -0,0 +1,79 @@ +#region Copyright notice and license +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +#endregion + +using System; + +namespace Google.Protobuf +{ + /// <summary> + /// Provides a utility routine to copy small arrays much more quickly than Buffer.BlockCopy + /// </summary> + internal static class ByteArray + { + /// <summary> + /// The threshold above which you should use Buffer.BlockCopy rather than ByteArray.Copy + /// </summary> + private const int CopyThreshold = 12; + + /// <summary> + /// Determines which copy routine to use based on the number of bytes to be copied. + /// </summary> + internal static void Copy(byte[] src, int srcOffset, byte[] dst, int dstOffset, int count) + { + if (count > CopyThreshold) + { + Buffer.BlockCopy(src, srcOffset, dst, dstOffset, count); + } + else + { + int stop = srcOffset + count; + for (int i = srcOffset; i < stop; i++) + { + dst[dstOffset++] = src[i]; + } + } + } + + /// <summary> + /// Reverses the order of bytes in the array + /// </summary> + internal static void Reverse(byte[] bytes) + { + for (int first = 0, last = bytes.Length - 1; first < last; first++, last--) + { + byte temp = bytes[first]; + bytes[first] = bytes[last]; + bytes[last] = temp; + } + } + } +}
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