Revert "delete everything" (includes everything non-go-crypto)

This reverts commit 96a3502

lite/files/commit.go

@@ -0,0 +1,93 @@
+package files
+
+import (
+	"io/ioutil"
+	"os"
+
+	"github.com/pkg/errors"
+
+	"github.com/tendermint/tendermint/lite"
+	liteErr "github.com/tendermint/tendermint/lite/errors"
+)
+
+const (
+	// MaxFullCommitSize is the maximum number of bytes we will
+	// read in for a full commit to avoid excessive allocations
+	// in the deserializer
+	MaxFullCommitSize = 1024 * 1024
+)
+
+// SaveFullCommit exports the seed in binary / go-amino style
+func SaveFullCommit(fc lite.FullCommit, path string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	defer f.Close()
+
+	_, err = cdc.MarshalBinaryWriter(f, fc)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	return nil
+}
+
+// SaveFullCommitJSON exports the seed in a json format
+func SaveFullCommitJSON(fc lite.FullCommit, path string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	defer f.Close()
+	bz, err := cdc.MarshalJSON(fc)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	_, err = f.Write(bz)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	return nil
+}
+
+// LoadFullCommit loads the full commit from the file system.
+func LoadFullCommit(path string) (lite.FullCommit, error) {
+	var fc lite.FullCommit
+	f, err := os.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return fc, liteErr.ErrCommitNotFound()
+		}
+		return fc, errors.WithStack(err)
+	}
+	defer f.Close()
+
+	_, err = cdc.UnmarshalBinaryReader(f, &fc, 0)
+	if err != nil {
+		return fc, errors.WithStack(err)
+	}
+	return fc, nil
+}
+
+// LoadFullCommitJSON loads the commit from the file system in JSON format.
+func LoadFullCommitJSON(path string) (lite.FullCommit, error) {
+	var fc lite.FullCommit
+	f, err := os.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return fc, liteErr.ErrCommitNotFound()
+		}
+		return fc, errors.WithStack(err)
+	}
+	defer f.Close()
+
+	bz, err := ioutil.ReadAll(f)
+	if err != nil {
+		return fc, errors.WithStack(err)
+	}
+	err = cdc.UnmarshalJSON(bz, &fc)
+	if err != nil {
+		return fc, errors.WithStack(err)
+	}
+	return fc, nil
+}