1 files changed, 75 insertions, 0 deletions
diff --git a/vendor/github.com/pierrec/lz4/v4/state.go b/vendor/github.com/pierrec/lz4/v4/state.go
new file mode 100644
index 0000000000..d94f04d05e
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/v4/state.go
@@ -0,0 +1,75 @@
+package lz4
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"github.com/pierrec/lz4/v4/internal/lz4errors"
+)
+
+//go:generate go run golang.org/x/tools/cmd/stringer -type=aState -output state_gen.go
+
+const (
+	noState     aState = iota // uninitialized reader
+	errorState                // unrecoverable error encountered
+	newState                  // instantiated object
+	readState                 // reading data
+	writeState                // writing data
+	closedState               // all done
+)
+
+type (
+	aState uint8
+	_State struct {
+		states []aState
+		state  aState
+		err    error
+	}
+)
+
+func (s *_State) init(states []aState) {
+	s.states = states
+	s.state = states[0]
+}
+
+func (s *_State) reset() {
+	s.state = s.states[0]
+	s.err = nil
+}
+
+// next sets the state to the next one unless it is passed a non nil error.
+// It returns whether or not it is in error.
+func (s *_State) next(err error) bool {
+	if err != nil {
+		s.err = fmt.Errorf("%s: %w", s.state, err)
+		s.state = errorState
+		return true
+	}
+	s.state = s.states[s.state]
+	return false
+}
+
+// nextd is like next but for defers.
+func (s *_State) nextd(errp *error) bool {
+	return errp != nil && s.next(*errp)
+}
+
+// check sets s in error if not already in error and if the error is not nil or io.EOF,
+func (s *_State) check(errp *error) {
+	if s.state == errorState || errp == nil {
+		return
+	}
+	if err := *errp; err != nil {
+		s.err = fmt.Errorf("%w[%s]", err, s.state)
+		if !errors.Is(err, io.EOF) {
+			s.state = errorState
+		}
+	}
+}
+
+func (s *_State) fail() error {
+	s.state = errorState
+	s.err = fmt.Errorf("%w[%s]", lz4errors.ErrInternalUnhandledState, s.state)
+	return s.err
+}