[VOL-1386] This commit add "dep" as the package management tool
for voltha-go.
Change-Id: I52bc4911dd00a441756ec7c30f46d45091f3f90e
diff --git a/vendor/github.com/pierrec/lz4/lz4.go b/vendor/github.com/pierrec/lz4/lz4.go
new file mode 100644
index 0000000..3580275
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/lz4.go
@@ -0,0 +1,68 @@
+// Package lz4 implements reading and writing lz4 compressed data (a frame),
+// as specified in http://fastcompression.blogspot.fr/2013/04/lz4-streaming-format-final.html.
+//
+// Although the block level compression and decompression functions are exposed and are fully compatible
+// with the lz4 block format definition, they are low level and should not be used directly.
+// For a complete description of an lz4 compressed block, see:
+// http://fastcompression.blogspot.fr/2011/05/lz4-explained.html
+//
+// See https://github.com/Cyan4973/lz4 for the reference C implementation.
+//
+package lz4
+
+const (
+ // Extension is the LZ4 frame file name extension
+ Extension = ".lz4"
+ // Version is the LZ4 frame format version
+ Version = 1
+
+ frameMagic uint32 = 0x184D2204
+ frameSkipMagic uint32 = 0x184D2A50
+
+ // The following constants are used to setup the compression algorithm.
+ minMatch = 4 // the minimum size of the match sequence size (4 bytes)
+ winSizeLog = 16 // LZ4 64Kb window size limit
+ winSize = 1 << winSizeLog
+ winMask = winSize - 1 // 64Kb window of previous data for dependent blocks
+ compressedBlockFlag = 1 << 31
+ compressedBlockMask = compressedBlockFlag - 1
+
+ // hashLog determines the size of the hash table used to quickly find a previous match position.
+ // Its value influences the compression speed and memory usage, the lower the faster,
+ // but at the expense of the compression ratio.
+ // 16 seems to be the best compromise.
+ hashLog = 16
+ hashTableSize = 1 << hashLog
+ hashShift = uint((minMatch * 8) - hashLog)
+
+ mfLimit = 8 + minMatch // The last match cannot start within the last 12 bytes.
+ skipStrength = 6 // variable step for fast scan
+)
+
+// map the block max size id with its value in bytes: 64Kb, 256Kb, 1Mb and 4Mb.
+var (
+ bsMapID = map[byte]int{4: 64 << 10, 5: 256 << 10, 6: 1 << 20, 7: 4 << 20}
+ bsMapValue = make(map[int]byte, len(bsMapID))
+)
+
+// Reversed.
+func init() {
+ for i, v := range bsMapID {
+ bsMapValue[v] = i
+ }
+}
+
+// Header describes the various flags that can be set on a Writer or obtained from a Reader.
+// The default values match those of the LZ4 frame format definition
+// (http://fastcompression.blogspot.com/2013/04/lz4-streaming-format-final.html).
+//
+// NB. in a Reader, in case of concatenated frames, the Header values may change between Read() calls.
+// It is the caller responsibility to check them if necessary.
+type Header struct {
+ BlockChecksum bool // Compressed blocks checksum flag.
+ NoChecksum bool // Frame checksum flag.
+ BlockMaxSize int // Size of the uncompressed data block (one of [64KB, 256KB, 1MB, 4MB]). Default=4MB.
+ Size uint64 // Frame total size. It is _not_ computed by the Writer.
+ CompressionLevel int // Compression level (higher is better, use 0 for fastest compression).
+ done bool // Header processed flag (Read or Write and checked).
+}