STOR-519: Add db-connect, a SQL over HTTPS server

vendor/github.com/cloudflare/golz4/lz4_hc.go

@@ -0,0 +1,38 @@
+package lz4
+
+// #cgo CFLAGS: -O3
+// #include "src/lz4hc.h"
+// #include "src/lz4hc.c"
+import "C"
+
+import (
+	"fmt"
+)
+
+// CompressHC compresses in and puts the content in out. len(out)
+// should have enough space for the compressed data (use CompressBound
+// to calculate). Returns the number of bytes in the out slice. Determines
+// the compression level automatically.
+func CompressHC(in, out []byte) (int, error) {
+	// 0 automatically sets the compression level.
+	return CompressHCLevel(in, out, 0)
+}
+
+// CompressHCLevel compresses in at the given compression level and puts the
+// content in out. len(out) should have enough space for the compressed data
+// (use CompressBound to calculate). Returns the number of bytes in the out
+// slice. To automatically choose the compression level, use 0. Otherwise, use
+// any value in the inclusive range 1 (worst) through 16 (best). Most
+// applications will prefer CompressHC.
+func CompressHCLevel(in, out []byte, level int) (outSize int, err error) {
+	// LZ4HC does not handle empty buffers. Pass through to Compress.
+	if len(in) == 0 || len(out) == 0 {
+		return Compress(in, out)
+	}
+
+	outSize = int(C.LZ4_compressHC2_limitedOutput(p(in), p(out), clen(in), clen(out), C.int(level)))
+	if outSize == 0 {
+		err = fmt.Errorf("insufficient space for compression")
+	}
+	return
+}