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| author | csharptest <roger@csharptest.net> | 2011-06-08 15:50:58 -0500 |
|---|---|---|
| committer | rogerk <devnull@localhost> | 2011-06-08 15:50:58 -0500 |
| commit | 2772dfe8a1eae7c942bb50d84bda3f45b5d7b683 (patch) | |
| tree | 0171c98d38d419780317398595c511810a19e203 /src/ProtocolBuffers/Bytes.cs | |
| parent | 0e2d144eb6e08f841ed4476cfff23ad462bbbcd9 (diff) | |
| download | protobuf-2772dfe8a1eae7c942bb50d84bda3f45b5d7b683.tar.gz protobuf-2772dfe8a1eae7c942bb50d84bda3f45b5d7b683.tar.bz2 protobuf-2772dfe8a1eae7c942bb50d84bda3f45b5d7b683.zip | |
Performance fix for float/double write bytes. Performance fix, do not use Array.Copy.
Diffstat (limited to 'src/ProtocolBuffers/Bytes.cs')
| -rw-r--r-- | src/ProtocolBuffers/Bytes.cs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/ProtocolBuffers/Bytes.cs b/src/ProtocolBuffers/Bytes.cs new file mode 100644 index 00000000..88bc16f8 --- /dev/null +++ b/src/ProtocolBuffers/Bytes.cs @@ -0,0 +1,32 @@ +namespace Google.ProtocolBuffers
+{
+ /// <summary>
+ /// Provides a utility routine to copy small arrays much more quickly than Buffer.BlockCopy
+ /// </summary>
+ static class Bytes
+ {
+ /// <summary>
+ /// The threshold above which you should use Buffer.BlockCopy rather than Bytes.Copy
+ /// </summary>
+ const int CopyThreshold = 12;
+ /// <summary>
+ /// Determines which copy routine to use based on the number of bytes to be copied.
+ /// </summary>
+ public static void Copy(byte[] src, int srcOffset, byte[] dst, int dstOffset, int count)
+ {
+ if (count > CopyThreshold)
+ global::System.Buffer.BlockCopy(src, srcOffset, dst, dstOffset, count);
+ else
+ ByteCopy(src, srcOffset, dst, dstOffset, count);
+ }
+ /// <summary>
+ /// Copyies the bytes provided with a for loop, faster when there are only a few bytes to copy
+ /// </summary>
+ public static void ByteCopy(byte[] src, int srcOffset, byte[] dst, int dstOffset, int count)
+ {
+ int stop = srcOffset + count;
+ for (int i = srcOffset; i < stop; i++)
+ dst[dstOffset++] = src[i];
+ }
+ }
+}
\ No newline at end of file |