common: remove old RLP implementation, Value and ExtPackage

In order to make this happen, kill all remaining trivial uses of
common/{rlp,value}.go. The non-trivial ones have been updated earlier.

10 files changed, 19 insertions, 1162 deletions

diff --git a/cmd/geth/chaincmd.go b/cmd/geth/chaincmd.go
index 80f3777d6..868ee7db1 100644
--- a/cmd/geth/chaincmd.go
+++ b/cmd/geth/chaincmd.go
@@ -137,8 +137,7 @@ func upgradeDB(ctx *cli.Context) {
 	glog.Infoln("Upgrading blockchain database")
 
 	chain, chainDb := utils.MakeChain(ctx)
-	v, _ := chainDb.Get([]byte("BlockchainVersion"))
-	bcVersion := int(common.NewValue(v).Uint())
+	bcVersion := core.GetBlockChainVersion(chainDb)
 	if bcVersion == 0 {
 		bcVersion = core.BlockChainVersion
 	}
@@ -154,7 +153,7 @@ func upgradeDB(ctx *cli.Context) {
 
 	// Import the chain file.
 	chain, chainDb = utils.MakeChain(ctx)
-	chainDb.Put([]byte("BlockchainVersion"), common.NewValue(core.BlockChainVersion).Bytes())
+	core.WriteBlockChainVersion(chainDb, core.BlockChainVersion)
 	err := utils.ImportChain(chain, exportFile)
 	chainDb.Close()
 	if err != nil {
diff --git a/common/package.go b/common/package.go
deleted file mode 100644
index 4e8780c08..000000000
--- a/common/package.go
+++ /dev/null
@@ -1,139 +0,0 @@
-// Copyright 2014 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package common
-
-import (
-	"archive/zip"
-	"encoding/json"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"strings"
-)
-
-// Manifest object
-//
-// The manifest object holds all the relevant information supplied with the
-// the manifest specified in the package
-type Manifest struct {
-	Entry         string
-	Height, Width int
-}
-
-// External package
-//
-// External package contains the main html file and manifest
-type ExtPackage struct {
-	EntryHtml string
-	Manifest  *Manifest
-}
-
-// Read file
-//
-// Read a given compressed file and returns the read bytes.
-// Returns an error otherwise
-func ReadFile(f *zip.File) ([]byte, error) {
-	rc, err := f.Open()
-	if err != nil {
-		return nil, err
-	}
-	defer rc.Close()
-
-	content, err := ioutil.ReadAll(rc)
-	if err != nil {
-		return nil, err
-	}
-
-	return content, nil
-}
-
-// Reads manifest
-//
-// Reads and returns a manifest object. Returns error otherwise
-func ReadManifest(m []byte) (*Manifest, error) {
-	var manifest Manifest
-
-	dec := json.NewDecoder(strings.NewReader(string(m)))
-	if err := dec.Decode(&manifest); err == io.EOF {
-	} else if err != nil {
-		return nil, err
-	}
-
-	return &manifest, nil
-}
-
-// Find file in archive
-//
-// Returns the index of the given file name if it exists. -1 if file not found
-func FindFileInArchive(fn string, files []*zip.File) (index int) {
-	index = -1
-	// Find the manifest first
-	for i, f := range files {
-		if f.Name == fn {
-			index = i
-		}
-	}
-
-	return
-}
-
-// Open package
-//
-// Opens a prepared ethereum package
-// Reads the manifest file and determines file contents and returns and
-// the external package.
-func OpenPackage(fn string) (*ExtPackage, error) {
-	r, err := zip.OpenReader(fn)
-	if err != nil {
-		return nil, err
-	}
-	defer r.Close()
-
-	manifestIndex := FindFileInArchive("manifest.json", r.File)
-
-	if manifestIndex < 0 {
-		return nil, fmt.Errorf("No manifest file found in archive")
-	}
-
-	f, err := ReadFile(r.File[manifestIndex])
-	if err != nil {
-		return nil, err
-	}
-
-	manifest, err := ReadManifest(f)
-	if err != nil {
-		return nil, err
-	}
-
-	if manifest.Entry == "" {
-		return nil, fmt.Errorf("Entry file specified but appears to be empty: %s", manifest.Entry)
-	}
-
-	entryIndex := FindFileInArchive(manifest.Entry, r.File)
-	if entryIndex < 0 {
-		return nil, fmt.Errorf("Entry file not found: '%s'", manifest.Entry)
-	}
-
-	f, err = ReadFile(r.File[entryIndex])
-	if err != nil {
-		return nil, err
-	}
-
-	extPackage := &ExtPackage{string(f), manifest}
-
-	return extPackage, nil
-}
diff --git a/common/rlp.go b/common/rlp.go
deleted file mode 100644
index 481b451b1..000000000
--- a/common/rlp.go
+++ /dev/null
@@ -1,292 +0,0 @@
-// Copyright 2014 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package common
-
-import (
-	"bytes"
-	"fmt"
-	"math/big"
-	"reflect"
-)
-
-type RlpEncode interface {
-	RlpEncode() []byte
-}
-
-type RlpEncodeDecode interface {
-	RlpEncode
-	RlpValue() []interface{}
-}
-
-type RlpEncodable interface {
-	RlpData() interface{}
-}
-
-func Rlp(encoder RlpEncode) []byte {
-	return encoder.RlpEncode()
-}
-
-type RlpEncoder struct {
-	rlpData []byte
-}
-
-func NewRlpEncoder() *RlpEncoder {
-	encoder := &RlpEncoder{}
-
-	return encoder
-}
-func (coder *RlpEncoder) EncodeData(rlpData interface{}) []byte {
-	return Encode(rlpData)
-}
-
-const (
-	RlpEmptyList = 0x80
-	RlpEmptyStr  = 0x40
-)
-
-const rlpEof = -1
-
-func Char(c []byte) int {
-	if len(c) > 0 {
-		return int(c[0])
-	}
-
-	return rlpEof
-}
-
-func DecodeWithReader(reader *bytes.Buffer) interface{} {
-	var slice []interface{}
-
-	// Read the next byte
-	char := Char(reader.Next(1))
-	switch {
-	case char <= 0x7f:
-		return char
-
-	case char <= 0xb7:
-		return reader.Next(int(char - 0x80))
-
-	case char <= 0xbf:
-		length := ReadVarInt(reader.Next(int(char - 0xb7)))
-
-		return reader.Next(int(length))
-
-	case char <= 0xf7:
-		length := int(char - 0xc0)
-		for i := 0; i < length; i++ {
-			obj := DecodeWithReader(reader)
-			slice = append(slice, obj)
-		}
-
-		return slice
-	case char <= 0xff:
-		length := ReadVarInt(reader.Next(int(char - 0xf7)))
-		for i := uint64(0); i < length; i++ {
-			obj := DecodeWithReader(reader)
-			slice = append(slice, obj)
-		}
-
-		return slice
-	default:
-		panic(fmt.Sprintf("byte not supported: %q", char))
-	}
-
-	return slice
-}
-
-var (
-	directRlp = big.NewInt(0x7f)
-	numberRlp = big.NewInt(0xb7)
-	zeroRlp   = big.NewInt(0x0)
-)
-
-func intlen(i int64) (length int) {
-	for i > 0 {
-		i = i >> 8
-		length++
-	}
-	return
-}
-
-func Encode(object interface{}) []byte {
-	var buff bytes.Buffer
-
-	if object != nil {
-		switch t := object.(type) {
-		case *Value:
-			buff.Write(Encode(t.Val))
-		case RlpEncodable:
-			buff.Write(Encode(t.RlpData()))
-		// Code dup :-/
-		case int:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case uint:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case int8:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case int16:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case int32:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case int64:
-			buff.Write(Encode(big.NewInt(t)))
-		case uint16:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case uint32:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case uint64:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case byte:
-			buff.Write(Encode(big.NewInt(int64(t))))
-		case *big.Int:
-			// Not sure how this is possible while we check for nil
-			if t == nil {
-				buff.WriteByte(0xc0)
-			} else {
-				buff.Write(Encode(t.Bytes()))
-			}
-		case Bytes:
-			buff.Write(Encode([]byte(t)))
-		case []byte:
-			if len(t) == 1 && t[0] <= 0x7f {
-				buff.Write(t)
-			} else if len(t) < 56 {
-				buff.WriteByte(byte(len(t) + 0x80))
-				buff.Write(t)
-			} else {
-				b := big.NewInt(int64(len(t)))
-				buff.WriteByte(byte(len(b.Bytes()) + 0xb7))
-				buff.Write(b.Bytes())
-				buff.Write(t)
-			}
-		case string:
-			buff.Write(Encode([]byte(t)))
-		case []interface{}:
-			// Inline function for writing the slice header
-			WriteSliceHeader := func(length int) {
-				if length < 56 {
-					buff.WriteByte(byte(length + 0xc0))
-				} else {
-					b := big.NewInt(int64(length))
-					buff.WriteByte(byte(len(b.Bytes()) + 0xf7))
-					buff.Write(b.Bytes())
-				}
-			}
-
-			var b bytes.Buffer
-			for _, val := range t {
-				b.Write(Encode(val))
-			}
-			WriteSliceHeader(len(b.Bytes()))
-			buff.Write(b.Bytes())
-		default:
-			// This is how it should have been from the start
-			// needs refactoring (@fjl)
-			v := reflect.ValueOf(t)
-			switch v.Kind() {
-			case reflect.Slice:
-				var b bytes.Buffer
-				for i := 0; i < v.Len(); i++ {
-					b.Write(Encode(v.Index(i).Interface()))
-				}
-
-				blen := b.Len()
-				if blen < 56 {
-					buff.WriteByte(byte(blen) + 0xc0)
-				} else {
-					ilen := byte(intlen(int64(blen)))
-					buff.WriteByte(ilen + 0xf7)
-					t := make([]byte, ilen)
-					for i := byte(0); i < ilen; i++ {
-						t[ilen-i-1] = byte(blen >> (i * 8))
-					}
-					buff.Write(t)
-				}
-				buff.ReadFrom(&b)
-			}
-		}
-	} else {
-		// Empty list for nil
-		buff.WriteByte(0xc0)
-	}
-
-	return buff.Bytes()
-}
-
-// TODO Use a bytes.Buffer instead of a raw byte slice.
-// Cleaner code, and use draining instead of seeking the next bytes to read
-func Decode(data []byte, pos uint64) (interface{}, uint64) {
-	var slice []interface{}
-	char := int(data[pos])
-	switch {
-	case char <= 0x7f:
-		return data[pos], pos + 1
-
-	case char <= 0xb7:
-		b := uint64(data[pos]) - 0x80
-
-		return data[pos+1 : pos+1+b], pos + 1 + b
-
-	case char <= 0xbf:
-		b := uint64(data[pos]) - 0xb7
-
-		b2 := ReadVarInt(data[pos+1 : pos+1+b])
-
-		return data[pos+1+b : pos+1+b+b2], pos + 1 + b + b2
-
-	case char <= 0xf7:
-		b := uint64(data[pos]) - 0xc0
-		prevPos := pos
-		pos++
-		for i := uint64(0); i < b; {
-			var obj interface{}
-
-			// Get the next item in the data list and append it
-			obj, prevPos = Decode(data, pos)
-			slice = append(slice, obj)
-
-			// Increment i by the amount bytes read in the previous
-			// read
-			i += (prevPos - pos)
-			pos = prevPos
-		}
-		return slice, pos
-
-	case char <= 0xff:
-		l := uint64(data[pos]) - 0xf7
-		b := ReadVarInt(data[pos+1 : pos+1+l])
-
-		pos = pos + l + 1
-
-		prevPos := b
-		for i := uint64(0); i < uint64(b); {
-			var obj interface{}
-
-			obj, prevPos = Decode(data, pos)
-			slice = append(slice, obj)
-
-			i += (prevPos - pos)
-			pos = prevPos
-		}
-		return slice, pos
-
-	default:
-		panic(fmt.Sprintf("byte not supported: %q", char))
-	}
-
-	return slice, 0
-}
diff --git a/common/rlp_test.go b/common/rlp_test.go
deleted file mode 100644
index 2320ffe3c..000000000
--- a/common/rlp_test.go
+++ /dev/null
@@ -1,176 +0,0 @@
-// Copyright 2014 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package common
-
-import (
-	"bytes"
-	"math/big"
-	"reflect"
-	"testing"
-
-	"github.com/ethereum/go-ethereum/rlp"
-)
-
-func TestNonInterfaceSlice(t *testing.T) {
-	vala := []string{"value1", "value2", "value3"}
-	valb := []interface{}{"value1", "value2", "value3"}
-	resa := Encode(vala)
-	resb := Encode(valb)
-	if !bytes.Equal(resa, resb) {
-		t.Errorf("expected []string & []interface{} to be equal")
-	}
-}
-
-func TestRlpValueEncoding(t *testing.T) {
-	val := EmptyValue()
-	val.AppendList().Append(byte(1)).Append(byte(2)).Append(byte(3))
-	val.Append("4").AppendList().Append(byte(5))
-
-	res, err := rlp.EncodeToBytes(val)
-	if err != nil {
-		t.Fatalf("encode error: %v", err)
-	}
-	exp := Encode([]interface{}{[]interface{}{1, 2, 3}, "4", []interface{}{5}})
-	if bytes.Compare(res, exp) != 0 {
-		t.Errorf("expected %x, got %x", exp, res)
-	}
-}
-
-func TestValueSlice(t *testing.T) {
-	val := []interface{}{
-		"value1",
-		"valeu2",
-		"value3",
-	}
-
-	value := NewValue(val)
-	splitVal := value.SliceFrom(1)
-
-	if splitVal.Len() != 2 {
-		t.Error("SliceFrom: Expected len", 2, "got", splitVal.Len())
-	}
-
-	splitVal = value.SliceTo(2)
-	if splitVal.Len() != 2 {
-		t.Error("SliceTo: Expected len", 2, "got", splitVal.Len())
-	}
-
-	splitVal = value.SliceFromTo(1, 3)
-	if splitVal.Len() != 2 {
-		t.Error("SliceFromTo: Expected len", 2, "got", splitVal.Len())
-	}
-}
-
-func TestLargeData(t *testing.T) {
-	data := make([]byte, 100000)
-	enc := Encode(data)
-	value := NewValueFromBytes(enc)
-	if value.Len() != len(data) {
-		t.Error("Expected data to be", len(data), "got", value.Len())
-	}
-}
-
-func TestValue(t *testing.T) {
-	value := NewValueFromBytes([]byte("\xcd\x83dog\x83god\x83cat\x01"))
-	if value.Get(0).Str() != "dog" {
-		t.Errorf("expected '%v', got '%v'", value.Get(0).Str(), "dog")
-	}
-
-	if value.Get(3).Uint() != 1 {
-		t.Errorf("expected '%v', got '%v'", value.Get(3).Uint(), 1)
-	}
-}
-
-func TestEncode(t *testing.T) {
-	strRes := "\x83dog"
-	bytes := Encode("dog")
-
-	str := string(bytes)
-	if str != strRes {
-		t.Errorf("Expected %q, got %q", strRes, str)
-	}
-
-	sliceRes := "\xcc\x83dog\x83god\x83cat"
-	strs := []interface{}{"dog", "god", "cat"}
-	bytes = Encode(strs)
-	slice := string(bytes)
-	if slice != sliceRes {
-		t.Error("Expected %q, got %q", sliceRes, slice)
-	}
-
-	intRes := "\x82\x04\x00"
-	bytes = Encode(1024)
-	if string(bytes) != intRes {
-		t.Errorf("Expected %q, got %q", intRes, bytes)
-	}
-}
-
-func TestDecode(t *testing.T) {
-	single := []byte("\x01")
-	b, _ := Decode(single, 0)
-
-	if b.(uint8) != 1 {
-		t.Errorf("Expected 1, got %q", b)
-	}
-
-	str := []byte("\x83dog")
-	b, _ = Decode(str, 0)
-	if bytes.Compare(b.([]byte), []byte("dog")) != 0 {
-		t.Errorf("Expected dog, got %q", b)
-	}
-
-	slice := []byte("\xcc\x83dog\x83god\x83cat")
-	res := []interface{}{"dog", "god", "cat"}
-	b, _ = Decode(slice, 0)
-	if reflect.DeepEqual(b, res) {
-		t.Errorf("Expected %q, got %q", res, b)
-	}
-}
-
-func TestEncodeDecodeBigInt(t *testing.T) {
-	bigInt := big.NewInt(1391787038)
-	encoded := Encode(bigInt)
-
-	value := NewValueFromBytes(encoded)
-	if value.BigInt().Cmp(bigInt) != 0 {
-		t.Errorf("Expected %v, got %v", bigInt, value.BigInt())
-	}
-}
-
-func TestEncodeDecodeBytes(t *testing.T) {
-	bv := NewValue([]interface{}{[]byte{1, 2, 3, 4, 5}, []byte{6}})
-	b, _ := rlp.EncodeToBytes(bv)
-	val := NewValueFromBytes(b)
-	if !bv.Cmp(val) {
-		t.Errorf("Expected %#v, got %#v", bv, val)
-	}
-}
-
-func TestEncodeZero(t *testing.T) {
-	b, _ := rlp.EncodeToBytes(NewValue(0))
-	exp := []byte{0xc0}
-	if bytes.Compare(b, exp) == 0 {
-		t.Error("Expected", exp, "got", b)
-	}
-}
-
-func BenchmarkEncodeDecode(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		bytes := Encode([]interface{}{"dog", "god", "cat"})
-		Decode(bytes, 0)
-	}
-}
diff --git a/common/value.go b/common/value.go
deleted file mode 100644
index 7abbf67b1..000000000
--- a/common/value.go
+++ /dev/null
@@ -1,428 +0,0 @@
-// Copyright 2014 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package common
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"math/big"
-	"reflect"
-	"strconv"
-
-	"github.com/ethereum/go-ethereum/rlp"
-)
-
-// Value can hold values of certain basic types and provides ways to
-// convert between types without bothering to check whether the
-// conversion is actually meaningful.
-//
-// It currently supports the following types:
-//
-//    - int{,8,16,32,64}
-//    - uint{,8,16,32,64}
-//    - *big.Int
-//    - []byte, string
-//    - []interface{}
-//
-// Value is useful whenever you feel that Go's types limit your
-// ability to express yourself. In these situations, use Value and
-// forget about this strong typing nonsense.
-type Value struct{ Val interface{} }
-
-func (val *Value) String() string {
-	return fmt.Sprintf("%x", val.Val)
-}
-
-func NewValue(val interface{}) *Value {
-	t := val
-	if v, ok := val.(*Value); ok {
-		t = v.Val
-	}
-
-	return &Value{Val: t}
-}
-
-func (val *Value) Type() reflect.Kind {
-	return reflect.TypeOf(val.Val).Kind()
-}
-
-func (val *Value) IsNil() bool {
-	return val.Val == nil
-}
-
-func (val *Value) Len() int {
-	if data, ok := val.Val.([]interface{}); ok {
-		return len(data)
-	}
-
-	return len(val.Bytes())
-}
-
-func (val *Value) Uint() uint64 {
-	if Val, ok := val.Val.(uint8); ok {
-		return uint64(Val)
-	} else if Val, ok := val.Val.(uint16); ok {
-		return uint64(Val)
-	} else if Val, ok := val.Val.(uint32); ok {
-		return uint64(Val)
-	} else if Val, ok := val.Val.(uint64); ok {
-		return Val
-	} else if Val, ok := val.Val.(float32); ok {
-		return uint64(Val)
-	} else if Val, ok := val.Val.(float64); ok {
-		return uint64(Val)
-	} else if Val, ok := val.Val.(int); ok {
-		return uint64(Val)
-	} else if Val, ok := val.Val.(uint); ok {
-		return uint64(Val)
-	} else if Val, ok := val.Val.([]byte); ok {
-		return new(big.Int).SetBytes(Val).Uint64()
-	} else if Val, ok := val.Val.(*big.Int); ok {
-		return Val.Uint64()
-	}
-
-	return 0
-}
-
-func (val *Value) Int() int64 {
-	if Val, ok := val.Val.(int8); ok {
-		return int64(Val)
-	} else if Val, ok := val.Val.(int16); ok {
-		return int64(Val)
-	} else if Val, ok := val.Val.(int32); ok {
-		return int64(Val)
-	} else if Val, ok := val.Val.(int64); ok {
-		return Val
-	} else if Val, ok := val.Val.(int); ok {
-		return int64(Val)
-	} else if Val, ok := val.Val.(float32); ok {
-		return int64(Val)
-	} else if Val, ok := val.Val.(float64); ok {
-		return int64(Val)
-	} else if Val, ok := val.Val.([]byte); ok {
-		return new(big.Int).SetBytes(Val).Int64()
-	} else if Val, ok := val.Val.(*big.Int); ok {
-		return Val.Int64()
-	} else if Val, ok := val.Val.(string); ok {
-		n, _ := strconv.Atoi(Val)
-		return int64(n)
-	}
-
-	return 0
-}
-
-func (val *Value) Byte() byte {
-	if Val, ok := val.Val.(byte); ok {
-		return Val
-	}
-
-	return 0x0
-}
-
-func (val *Value) BigInt() *big.Int {
-	if a, ok := val.Val.([]byte); ok {
-		b := new(big.Int).SetBytes(a)
-
-		return b
-	} else if a, ok := val.Val.(*big.Int); ok {
-		return a
-	} else if a, ok := val.Val.(string); ok {
-		return Big(a)
-	} else {
-		return big.NewInt(int64(val.Uint()))
-	}
-
-	return big.NewInt(0)
-}
-
-func (val *Value) Str() string {
-	if a, ok := val.Val.([]byte); ok {
-		return string(a)
-	} else if a, ok := val.Val.(string); ok {
-		return a
-	} else if a, ok := val.Val.(byte); ok {
-		return string(a)
-	}
-
-	return ""
-}
-
-func (val *Value) Bytes() []byte {
-	if a, ok := val.Val.([]byte); ok {
-		return a
-	} else if s, ok := val.Val.(byte); ok {
-		return []byte{s}
-	} else if s, ok := val.Val.(string); ok {
-		return []byte(s)
-	} else if s, ok := val.Val.(*big.Int); ok {
-		return s.Bytes()
-	} else {
-		return big.NewInt(val.Int()).Bytes()
-	}
-
-	return []byte{}
-}
-
-func (val *Value) Err() error {
-	if err, ok := val.Val.(error); ok {
-		return err
-	}
-
-	return nil
-}
-
-func (val *Value) Slice() []interface{} {
-	if d, ok := val.Val.([]interface{}); ok {
-		return d
-	}
-
-	return []interface{}{}
-}
-
-func (val *Value) SliceFrom(from int) *Value {
-	slice := val.Slice()
-
-	return NewValue(slice[from:])
-}
-
-func (val *Value) SliceTo(to int) *Value {
-	slice := val.Slice()
-
-	return NewValue(slice[:to])
-}
-
-func (val *Value) SliceFromTo(from, to int) *Value {
-	slice := val.Slice()
-
-	return NewValue(slice[from:to])
-}
-
-// TODO More type checking methods
-func (val *Value) IsSlice() bool {
-	return val.Type() == reflect.Slice
-}
-
-func (val *Value) IsStr() bool {
-	return val.Type() == reflect.String
-}
-
-func (self *Value) IsErr() bool {
-	_, ok := self.Val.(error)
-	return ok
-}
-
-// Special list checking function. Something is considered
-// a list if it's of type []interface{}. The list is usually
-// used in conjunction with rlp decoded streams.
-func (val *Value) IsList() bool {
-	_, ok := val.Val.([]interface{})
-
-	return ok
-}
-
-func (val *Value) IsEmpty() bool {
-	return val.Val == nil || ((val.IsSlice() || val.IsStr()) && val.Len() == 0)
-}
-
-// Threat the value as a slice
-func (val *Value) Get(idx int) *Value {
-	if d, ok := val.Val.([]interface{}); ok {
-		// Guard for oob
-		if len(d) <= idx {
-			return NewValue(nil)
-		}
-
-		if idx < 0 {
-			return NewValue(nil)
-		}
-
-		return NewValue(d[idx])
-	}
-
-	// If this wasn't a slice you probably shouldn't be using this function
-	return NewValue(nil)
-}
-
-func (self *Value) Copy() *Value {
-	switch val := self.Val.(type) {
-	case *big.Int:
-		return NewValue(new(big.Int).Set(val))
-	case []byte:
-		return NewValue(CopyBytes(val))
-	default:
-		return NewValue(self.Val)
-	}
-
-	return nil
-}
-
-func (val *Value) Cmp(o *Value) bool {
-	return reflect.DeepEqual(val.Val, o.Val)
-}
-
-func (self *Value) DeepCmp(o *Value) bool {
-	return bytes.Compare(self.Bytes(), o.Bytes()) == 0
-}
-
-func (self *Value) DecodeRLP(s *rlp.Stream) error {
-	var v interface{}
-	if err := s.Decode(&v); err != nil {
-		return err
-	}
-	self.Val = v
-	return nil
-}
-
-func (self *Value) EncodeRLP(w io.Writer) error {
-	if self == nil {
-		w.Write(rlp.EmptyList)
-		return nil
-	} else {
-		return rlp.Encode(w, self.Val)
-	}
-}
-
-// NewValueFromBytes decodes RLP data.
-// The contained value will be nil if data contains invalid RLP.
-func NewValueFromBytes(data []byte) *Value {
-	v := new(Value)
-	if len(data) != 0 {
-		if err := rlp.DecodeBytes(data, v); err != nil {
-			v.Val = nil
-		}
-	}
-	return v
-}
-
-// Value setters
-func NewSliceValue(s interface{}) *Value {
-	list := EmptyValue()
-
-	if s != nil {
-		if slice, ok := s.([]interface{}); ok {
-			for _, val := range slice {
-				list.Append(val)
-			}
-		} else if slice, ok := s.([]string); ok {
-			for _, val := range slice {
-				list.Append(val)
-			}
-		}
-	}
-
-	return list
-}
-
-func EmptyValue() *Value {
-	return NewValue([]interface{}{})
-}
-
-func (val *Value) AppendList() *Value {
-	list := EmptyValue()
-	val.Val = append(val.Slice(), list)
-
-	return list
-}
-
-func (val *Value) Append(v interface{}) *Value {
-	val.Val = append(val.Slice(), v)
-
-	return val
-}
-
-const (
-	valOpAdd = iota
-	valOpDiv
-	valOpMul
-	valOpPow
-	valOpSub
-)
-
-// Math stuff
-func (self *Value) doOp(op int, other interface{}) *Value {
-	left := self.BigInt()
-	right := NewValue(other).BigInt()
-
-	switch op {
-	case valOpAdd:
-		self.Val = left.Add(left, right)
-	case valOpDiv:
-		self.Val = left.Div(left, right)
-	case valOpMul:
-		self.Val = left.Mul(left, right)
-	case valOpPow:
-		self.Val = left.Exp(left, right, Big0)
-	case valOpSub:
-		self.Val = left.Sub(left, right)
-	}
-
-	return self
-}
-
-func (self *Value) Add(other interface{}) *Value {
-	return self.doOp(valOpAdd, other)
-}
-
-func (self *Value) Sub(other interface{}) *Value {
-	return self.doOp(valOpSub, other)
-}
-
-func (self *Value) Div(other interface{}) *Value {
-	return self.doOp(valOpDiv, other)
-}
-
-func (self *Value) Mul(other interface{}) *Value {
-	return self.doOp(valOpMul, other)
-}
-
-func (self *Value) Pow(other interface{}) *Value {
-	return self.doOp(valOpPow, other)
-}
-
-type ValueIterator struct {
-	value        *Value
-	currentValue *Value
-	idx          int
-}
-
-func (val *Value) NewIterator() *ValueIterator {
-	return &ValueIterator{value: val}
-}
-
-func (it *ValueIterator) Len() int {
-	return it.value.Len()
-}
-
-func (it *ValueIterator) Next() bool {
-	if it.idx >= it.value.Len() {
-		return false
-	}
-
-	it.currentValue = it.value.Get(it.idx)
-	it.idx++
-
-	return true
-}
-
-func (it *ValueIterator) Value() *Value {
-	return it.currentValue
-}
-
-func (it *ValueIterator) Idx() int {
-	return it.idx - 1
-}
diff --git a/common/value_test.go b/common/value_test.go
deleted file mode 100644
index ac2ef02a7..000000000
--- a/common/value_test.go
+++ /dev/null
@@ -1,86 +0,0 @@
-// Copyright 2014 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package common
-
-import (
-	"math/big"
-
-	checker "gopkg.in/check.v1"
-)
-
-type ValueSuite struct{}
-
-var _ = checker.Suite(&ValueSuite{})
-
-func (s *ValueSuite) TestValueCmp(c *checker.C) {
-	val1 := NewValue("hello")
-	val2 := NewValue("world")
-	c.Assert(val1.Cmp(val2), checker.Equals, false)
-
-	val3 := NewValue("hello")
-	val4 := NewValue("hello")
-	c.Assert(val3.Cmp(val4), checker.Equals, true)
-}
-
-func (s *ValueSuite) TestValueTypes(c *checker.C) {
-	str := NewValue("str")
-	num := NewValue(1)
-	inter := NewValue([]interface{}{1})
-	byt := NewValue([]byte{1, 2, 3, 4})
-	bigInt := NewValue(big.NewInt(10))
-
-	strExp := "str"
-	numExp := uint64(1)
-	interExp := []interface{}{1}
-	bytExp := []byte{1, 2, 3, 4}
-	bigExp := big.NewInt(10)
-
-	c.Assert(str.Str(), checker.Equals, strExp)
-	c.Assert(num.Uint(), checker.Equals, numExp)
-	c.Assert(NewValue(inter.Val).Cmp(NewValue(interExp)), checker.Equals, true)
-	c.Assert(byt.Bytes(), checker.DeepEquals, bytExp)
-	c.Assert(bigInt.BigInt(), checker.DeepEquals, bigExp)
-}
-
-func (s *ValueSuite) TestIterator(c *checker.C) {
-	value := NewValue([]interface{}{1, 2, 3})
-	iter := value.NewIterator()
-	values := []uint64{1, 2, 3}
-	i := 0
-	for iter.Next() {
-		c.Assert(values[i], checker.Equals, iter.Value().Uint())
-		i++
-	}
-}
-
-func (s *ValueSuite) TestMath(c *checker.C) {
-	data1 := NewValue(1)
-	data1.Add(1).Add(1)
-	exp1 := NewValue(3)
-	data2 := NewValue(2)
-	data2.Sub(1).Sub(1)
-	exp2 := NewValue(0)
-
-	c.Assert(data1.DeepCmp(exp1), checker.Equals, true)
-	c.Assert(data2.DeepCmp(exp2), checker.Equals, true)
-}
-
-func (s *ValueSuite) TestString(c *checker.C) {
-	data := "10"
-	exp := int64(10)
-	c.Assert(NewValue(data).Int(), checker.DeepEquals, exp)
-}
diff --git a/core/database_util.go b/core/database_util.go
index fbcce3e8c..2dc113e29 100644
--- a/core/database_util.go
+++ b/core/database_util.go
@@ -582,3 +582,17 @@ func GetMipmapBloom(db ethdb.Database, number, level uint64) types.Bloom {
 	bloomDat, _ := db.Get(mipmapKey(number, level))
 	return types.BytesToBloom(bloomDat)
 }
+
+// GetBlockChainVersion reads the version number from db.
+func GetBlockChainVersion(db ethdb.Database) int {
+	var vsn uint
+	enc, _ := db.Get([]byte("BlockchainVersion"))
+	rlp.DecodeBytes(enc, &vsn)
+	return int(vsn)
+}
+
+// WriteBlockChainVersion writes vsn as the version number to db.
+func WriteBlockChainVersion(db ethdb.Database, vsn int) {
+	enc, _ := rlp.EncodeToBytes(uint(vsn))
+	db.Put([]byte("BlockchainVersion"), enc)
+}
diff --git a/eth/backend.go b/eth/backend.go
index d51446d51..abd1214ca 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -180,12 +180,11 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	}
 
 	if !config.SkipBcVersionCheck {
-		b, _ := chainDb.Get([]byte("BlockchainVersion"))
-		bcVersion := int(common.NewValue(b).Uint())
+		bcVersion := core.GetBlockChainVersion(chainDb)
 		if bcVersion != config.BlockChainVersion && bcVersion != 0 {
 			return nil, fmt.Errorf("Blockchain DB version mismatch (%d / %d). Run geth upgradedb.\n", bcVersion, config.BlockChainVersion)
 		}
-		saveBlockchainVersion(chainDb, config.BlockChainVersion)
+		core.WriteBlockChainVersion(chainDb, config.BlockChainVersion)
 	}
 	glog.V(logger.Info).Infof("Blockchain DB Version: %d", config.BlockChainVersion)
 
@@ -479,15 +478,6 @@ func dagFiles(epoch uint64) (string, string) {
 	return dag, "full-R" + dag
 }
 
-func saveBlockchainVersion(db ethdb.Database, bcVersion int) {
-	d, _ := db.Get([]byte("BlockchainVersion"))
-	blockchainVersion := common.NewValue(d).Uint()
-
-	if blockchainVersion == 0 {
-		db.Put([]byte("BlockchainVersion"), common.NewValue(bcVersion).Bytes())
-	}
-}
-
 // upgradeChainDatabase ensures that the chain database stores block split into
 // separate header and body entries.
 func upgradeChainDatabase(db ethdb.Database) error {
diff --git a/ethdb/memory_database.go b/ethdb/memory_database.go
index 01273b9db..45423ed73 100644
--- a/ethdb/memory_database.go
+++ b/ethdb/memory_database.go
@@ -18,7 +18,6 @@ package ethdb
 
 import (
 	"errors"
-	"fmt"
 	"sync"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -90,27 +89,7 @@ func (db *MemDatabase) Delete(key []byte) error {
 	return nil
 }
 
-func (db *MemDatabase) Print() {
-	db.lock.RLock()
-	defer db.lock.RUnlock()
-
-	for key, val := range db.db {
-		fmt.Printf("%x(%d): ", key, len(key))
-		node := common.NewValueFromBytes(val)
-		fmt.Printf("%q\n", node.Val)
-	}
-}
-
-func (db *MemDatabase) Close() {
-}
-
-func (db *MemDatabase) LastKnownTD() []byte {
-	data, _ := db.Get([]byte("LastKnownTotalDifficulty"))
-	if len(data) == 0 || data == nil {
-		data = []byte{0x0}
-	}
-	return data
-}
+func (db *MemDatabase) Close() {}
 
 func (db *MemDatabase) NewBatch() Batch {
 	return &memBatch{db: db}
diff --git a/xeth/types.go b/xeth/types.go
index 218c8dc7c..090115b7e 100644
--- a/xeth/types.go
+++ b/xeth/types.go
@@ -47,10 +47,6 @@ func (self *Object) StorageString(str string) []byte {
 	}
 }
 
-func (self *Object) StorageValue(addr *common.Value) []byte {
-	return self.storage(addr.Bytes())
-}
-
 func (self *Object) storage(addr []byte) []byte {
 	return self.StateObject.GetState(common.BytesToHash(addr)).Bytes()
 }