[VOL-5486] Upgrade library versions
Change-Id: I8b4e88699e03f44ee13e467867f45ae3f0a63c4b
Signed-off-by: Abhay Kumar <abhay.kumar@radisys.com>
diff --git a/vendor/github.com/klauspost/compress/flate/level2.go b/vendor/github.com/klauspost/compress/flate/level2.go
new file mode 100644
index 0000000..c8d047f
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/flate/level2.go
@@ -0,0 +1,214 @@
+package flate
+
+import "fmt"
+
+// fastGen maintains the table for matches,
+// and the previous byte block for level 2.
+// This is the generic implementation.
+type fastEncL2 struct {
+ fastGen
+ table [bTableSize]tableEntry
+}
+
+// EncodeL2 uses a similar algorithm to level 1, but is capable
+// of matching across blocks giving better compression at a small slowdown.
+func (e *fastEncL2) Encode(dst *tokens, src []byte) {
+ const (
+ inputMargin = 12 - 1
+ minNonLiteralBlockSize = 1 + 1 + inputMargin
+ hashBytes = 5
+ )
+
+ if debugDeflate && e.cur < 0 {
+ panic(fmt.Sprint("e.cur < 0: ", e.cur))
+ }
+
+ // Protect against e.cur wraparound.
+ for e.cur >= bufferReset {
+ if len(e.hist) == 0 {
+ for i := range e.table[:] {
+ e.table[i] = tableEntry{}
+ }
+ e.cur = maxMatchOffset
+ break
+ }
+ // Shift down everything in the table that isn't already too far away.
+ minOff := e.cur + int32(len(e.hist)) - maxMatchOffset
+ for i := range e.table[:] {
+ v := e.table[i].offset
+ if v <= minOff {
+ v = 0
+ } else {
+ v = v - e.cur + maxMatchOffset
+ }
+ e.table[i].offset = v
+ }
+ e.cur = maxMatchOffset
+ }
+
+ s := e.addBlock(src)
+
+ // This check isn't in the Snappy implementation, but there, the caller
+ // instead of the callee handles this case.
+ if len(src) < minNonLiteralBlockSize {
+ // We do not fill the token table.
+ // This will be picked up by caller.
+ dst.n = uint16(len(src))
+ return
+ }
+
+ // Override src
+ src = e.hist
+ nextEmit := s
+
+ // sLimit is when to stop looking for offset/length copies. The inputMargin
+ // lets us use a fast path for emitLiteral in the main loop, while we are
+ // looking for copies.
+ sLimit := int32(len(src) - inputMargin)
+
+ // nextEmit is where in src the next emitLiteral should start from.
+ cv := load6432(src, s)
+ for {
+ // When should we start skipping if we haven't found matches in a long while.
+ const skipLog = 5
+ const doEvery = 2
+
+ nextS := s
+ var candidate tableEntry
+ for {
+ nextHash := hashLen(cv, bTableBits, hashBytes)
+ s = nextS
+ nextS = s + doEvery + (s-nextEmit)>>skipLog
+ if nextS > sLimit {
+ goto emitRemainder
+ }
+ candidate = e.table[nextHash]
+ now := load6432(src, nextS)
+ e.table[nextHash] = tableEntry{offset: s + e.cur}
+ nextHash = hashLen(now, bTableBits, hashBytes)
+
+ offset := s - (candidate.offset - e.cur)
+ if offset < maxMatchOffset && uint32(cv) == load3232(src, candidate.offset-e.cur) {
+ e.table[nextHash] = tableEntry{offset: nextS + e.cur}
+ break
+ }
+
+ // Do one right away...
+ cv = now
+ s = nextS
+ nextS++
+ candidate = e.table[nextHash]
+ now >>= 8
+ e.table[nextHash] = tableEntry{offset: s + e.cur}
+
+ offset = s - (candidate.offset - e.cur)
+ if offset < maxMatchOffset && uint32(cv) == load3232(src, candidate.offset-e.cur) {
+ break
+ }
+ cv = now
+ }
+
+ // A 4-byte match has been found. We'll later see if more than 4 bytes
+ // match. But, prior to the match, src[nextEmit:s] are unmatched. Emit
+ // them as literal bytes.
+
+ // Call emitCopy, and then see if another emitCopy could be our next
+ // move. Repeat until we find no match for the input immediately after
+ // what was consumed by the last emitCopy call.
+ //
+ // If we exit this loop normally then we need to call emitLiteral next,
+ // though we don't yet know how big the literal will be. We handle that
+ // by proceeding to the next iteration of the main loop. We also can
+ // exit this loop via goto if we get close to exhausting the input.
+ for {
+ // Invariant: we have a 4-byte match at s, and no need to emit any
+ // literal bytes prior to s.
+
+ // Extend the 4-byte match as long as possible.
+ t := candidate.offset - e.cur
+ l := e.matchlenLong(int(s+4), int(t+4), src) + 4
+
+ // Extend backwards
+ for t > 0 && s > nextEmit && src[t-1] == src[s-1] {
+ s--
+ t--
+ l++
+ }
+ if nextEmit < s {
+ if false {
+ emitLiteral(dst, src[nextEmit:s])
+ } else {
+ for _, v := range src[nextEmit:s] {
+ dst.tokens[dst.n] = token(v)
+ dst.litHist[v]++
+ dst.n++
+ }
+ }
+ }
+
+ dst.AddMatchLong(l, uint32(s-t-baseMatchOffset))
+ s += l
+ nextEmit = s
+ if nextS >= s {
+ s = nextS + 1
+ }
+
+ if s >= sLimit {
+ // Index first pair after match end.
+ if int(s+l+8) < len(src) {
+ cv := load6432(src, s)
+ e.table[hashLen(cv, bTableBits, hashBytes)] = tableEntry{offset: s + e.cur}
+ }
+ goto emitRemainder
+ }
+
+ // Store every second hash in-between, but offset by 1.
+ for i := s - l + 2; i < s-5; i += 7 {
+ x := load6432(src, i)
+ nextHash := hashLen(x, bTableBits, hashBytes)
+ e.table[nextHash] = tableEntry{offset: e.cur + i}
+ // Skip one
+ x >>= 16
+ nextHash = hashLen(x, bTableBits, hashBytes)
+ e.table[nextHash] = tableEntry{offset: e.cur + i + 2}
+ // Skip one
+ x >>= 16
+ nextHash = hashLen(x, bTableBits, hashBytes)
+ e.table[nextHash] = tableEntry{offset: e.cur + i + 4}
+ }
+
+ // We could immediately start working at s now, but to improve
+ // compression we first update the hash table at s-2 to s. If
+ // another emitCopy is not our next move, also calculate nextHash
+ // at s+1. At least on GOARCH=amd64, these three hash calculations
+ // are faster as one load64 call (with some shifts) instead of
+ // three load32 calls.
+ x := load6432(src, s-2)
+ o := e.cur + s - 2
+ prevHash := hashLen(x, bTableBits, hashBytes)
+ prevHash2 := hashLen(x>>8, bTableBits, hashBytes)
+ e.table[prevHash] = tableEntry{offset: o}
+ e.table[prevHash2] = tableEntry{offset: o + 1}
+ currHash := hashLen(x>>16, bTableBits, hashBytes)
+ candidate = e.table[currHash]
+ e.table[currHash] = tableEntry{offset: o + 2}
+
+ offset := s - (candidate.offset - e.cur)
+ if offset > maxMatchOffset || uint32(x>>16) != load3232(src, candidate.offset-e.cur) {
+ cv = x >> 24
+ s++
+ break
+ }
+ }
+ }
+
+emitRemainder:
+ if int(nextEmit) < len(src) {
+ // If nothing was added, don't encode literals.
+ if dst.n == 0 {
+ return
+ }
+
+ emitLiteral(dst, src[nextEmit:])
+ }
+}