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types.go
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types.go
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// Package mmdbtype provides types used within the MaxMind DB format.
package mmdbtype
import (
"encoding/binary"
"io"
"math/big"
"math/bits"
"sort"
"github.com/pkg/errors"
)
type typeNum byte
const (
typeNumExtended typeNum = iota
typeNumPointer
typeNumString
typeNumFloat64
typeNumBytes
typeNumUint16
typeNumUint32
typeNumMap
typeNumInt32
typeNumUint64
typeNumUint128
typeNumSlice
// We don't use the next two. They are placeholders. See the spec
// for more details.
typeNumContainer // nolint: deadcode, varcheck
typeNumMarker // nolint: deadcode, varcheck
typeNumBool
typeNumFloat32
)
type writer interface {
io.Writer
WriteByte(byte) error
WriteString(string) (int, error)
WriteOrWritePointer(DataType) (int64, error)
}
// DataType represents a MaxMind DB data type
type DataType interface {
Copy() DataType
size() int
typeNum() typeNum
WriteTo(writer) (int64, error)
}
// Bool is the MaxMind DB boolean type
type Bool bool
// Copy the value
func (t Bool) Copy() DataType { return t }
func (t Bool) size() int {
if t {
return 1
}
return 0
}
func (t Bool) typeNum() typeNum {
return typeNumBool
}
// WriteTo writes the value to w.
func (t Bool) WriteTo(w writer) (int64, error) {
return writeCtrlByte(w, t)
}
// Bytes is the MaxMind DB bytes type
type Bytes []byte
// Copy the value
func (t Bytes) Copy() DataType {
nv := make(Bytes, len(t))
copy(nv, t)
return nv
}
func (t Bytes) size() int {
return len(t)
}
func (t Bytes) typeNum() typeNum {
return typeNumBytes
}
// WriteTo writes the value to w.
func (t Bytes) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
written, err := w.Write([]byte(t))
numBytes += int64(written)
if err != nil {
return numBytes, errors.Wrapf(err, `error writing "%s" as bytes`, t)
}
return numBytes, nil
}
// Float32 is the MaxMind DB float type
type Float32 float32
// Copy the value
func (t Float32) Copy() DataType { return t }
func (t Float32) size() int {
return 4
}
func (t Float32) typeNum() typeNum {
return typeNumFloat32
}
// WriteTo writes the value to w.
func (t Float32) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
err = binary.Write(w, binary.BigEndian, t)
if err != nil {
return numBytes, errors.Wrapf(err, "error writing %f as float32", t)
}
return numBytes + int64(t.size()), nil
}
// Float64 is the MaxMind DB double type
type Float64 float64
// Copy the value
func (t Float64) Copy() DataType { return t }
func (t Float64) size() int {
return 8
}
func (t Float64) typeNum() typeNum {
return typeNumFloat64
}
// WriteTo writes the value to w.
func (t Float64) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
err = binary.Write(w, binary.BigEndian, t)
if err != nil {
return numBytes, errors.Wrapf(err, "error writing %f as float64", t)
}
return numBytes + int64(t.size()), nil
}
// Int32 is the MaxMind DB signed 32-bit integer type
type Int32 int32
// Copy the value
func (t Int32) Copy() DataType { return t }
func (t Int32) size() int {
return 4 - bits.LeadingZeros32(uint32(t))/8
}
func (t Int32) typeNum() typeNum {
return typeNumInt32
}
// WriteTo writes the value to w.
func (t Int32) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
size := t.size()
// We ignore leading zeros
for i := size; i > 0; i-- {
err = w.WriteByte(byte((int32(t) >> (8 * (i - 1))) & 0xFF))
if err != nil {
return numBytes + int64(size-i), errors.Wrap(err, "error writing int32")
}
}
return numBytes + int64(size), nil
}
// Map is the MaxMind DB map type
type Map map[String]DataType
// Copy makes a deep copy of the Map
func (t Map) Copy() DataType {
newMap := make(Map, len(t))
for k, v := range t {
newMap[k] = v.Copy()
}
return newMap
}
func (t Map) size() int {
return len(t)
}
func (t Map) typeNum() typeNum {
return typeNumMap
}
// WriteTo writes the value to w.
func (t Map) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
// We want database builds to be reproducible. As such, we insert
// the map items in order by key value. In the future, we will
// likely use a more relevant characteristic here (e.g., putting
// fields more likely to be accessed first).
keys := make([]string, 0, len(t))
for k := range t {
keys = append(keys, string(k))
}
sort.Strings(keys)
for _, ks := range keys {
k := String(ks)
written, err := w.WriteOrWritePointer(k)
numBytes += written
if err != nil {
return numBytes, err
}
written, err = w.WriteOrWritePointer(t[k])
numBytes += written
if err != nil {
return numBytes, err
}
}
return numBytes, nil
}
// Pointer is the MaxMind DB pointer type for internal use in the writer. You
// should not use this type in data structures that you pass to methods on
// mmdbwriter.Tree. Doing so may result in a corrupt database.
type Pointer uint32
// Copy the value
func (t Pointer) Copy() DataType { return t }
const (
pointerMaxSize0 = 1 << 11
pointerMaxSize1 = pointerMaxSize0 + (1 << 19)
pointerMaxSize2 = pointerMaxSize1 + (1 << 27)
)
func (t Pointer) size() int {
switch {
case t < pointerMaxSize0:
return 0
case t < pointerMaxSize1:
return 1
case t < pointerMaxSize2:
return 2
default:
return 3
}
}
// WrittenSize is the actual total size of the pointer in the
// database data section.
func (t Pointer) WrittenSize() int64 {
return int64(t.size() + 2)
}
func (t Pointer) typeNum() typeNum {
return typeNumPointer
}
// WriteTo writes the value to w.
func (t Pointer) WriteTo(w writer) (int64, error) {
size := t.size()
switch size {
case 0:
err := w.WriteByte(0b00100000 | byte(0b111&(t>>8)))
if err != nil {
return 0, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & t))
if err != nil {
return 1, errors.Wrap(err, "error writing pointer")
}
case 1:
v := t - pointerMaxSize0
err := w.WriteByte(0b00101000 | byte(0b111&(v>>16)))
if err != nil {
return 0, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & (v >> 8)))
if err != nil {
return 1, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & v))
if err != nil {
return 2, errors.Wrap(err, "error writing pointer")
}
case 2:
v := t - pointerMaxSize1
err := w.WriteByte(0b00110000 | byte(0b111&(v>>24)))
if err != nil {
return 0, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & (v >> 16)))
if err != nil {
return 1, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & (v >> 8)))
if err != nil {
return 2, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & v))
if err != nil {
return 3, errors.Wrap(err, "error writing pointer")
}
case 3:
err := w.WriteByte(0b00111000)
if err != nil {
return 0, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & (t >> 24)))
if err != nil {
return 1, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & (t >> 16)))
if err != nil {
return 2, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & (t >> 8)))
if err != nil {
return 3, errors.Wrap(err, "error writing pointer")
}
err = w.WriteByte(byte(0xFF & t))
if err != nil {
return 4, errors.Wrap(err, "error writing pointer")
}
}
return t.WrittenSize(), nil
}
// Slice is the MaxMind DB array type
type Slice []DataType
// Copy makes a deep copy of the Slice
func (t Slice) Copy() DataType {
newSlice := make(Slice, len(t))
for k, v := range t {
newSlice[k] = v.Copy()
}
return newSlice
}
func (t Slice) size() int {
return len(t)
}
func (t Slice) typeNum() typeNum {
return typeNumSlice
}
// WriteTo writes the value to w.
func (t Slice) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
for _, e := range t {
written, err := w.WriteOrWritePointer(e)
numBytes += written
if err != nil {
return numBytes, err
}
}
return numBytes, nil
}
// String is the MaxMind DB string type
type String string
// Copy the value
func (t String) Copy() DataType { return t }
func (t String) size() int {
return len(t)
}
func (t String) typeNum() typeNum {
return typeNumString
}
// WriteTo writes the value to w.
func (t String) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
written, err := w.WriteString(string(t))
numBytes += int64(written)
if err != nil {
return numBytes, errors.Wrapf(err, `error writing "%s" as a string`, t)
}
return numBytes, nil
}
// Uint16 is the MaxMind DB unsigned 16-bit integer type
type Uint16 uint16
// Copy the value
func (t Uint16) Copy() DataType { return t }
func (t Uint16) size() int {
return 2 - bits.LeadingZeros16(uint16(t))/8
}
func (t Uint16) typeNum() typeNum {
return typeNumUint16
}
// WriteTo writes the value to w.
func (t Uint16) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
size := t.size()
// We ignore leading zeros
for i := size; i > 0; i-- {
err = w.WriteByte(byte(t >> (8 * (i - 1)) & 0xFF))
if err != nil {
return numBytes + int64(size-i), errors.Wrap(err, "error writing uint16")
}
}
return numBytes + int64(size), nil
}
// Uint32 is the MaxMind DB unsigned 32-bit integer type
type Uint32 uint32
// Copy the value
func (t Uint32) Copy() DataType { return t }
func (t Uint32) size() int {
return 4 - bits.LeadingZeros32(uint32(t))/8
}
func (t Uint32) typeNum() typeNum {
return typeNumUint32
}
// WriteTo writes the value to w.
func (t Uint32) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
size := t.size()
// We ignore leading zeros
for i := size; i > 0; i-- {
err = w.WriteByte(byte(t >> (8 * (i - 1)) & 0xFF))
if err != nil {
return numBytes + int64(size-i), errors.Wrap(err, "error writing uint32")
}
}
return numBytes + int64(size), nil
}
// Uint64 is the MaxMind DB unsigned 64-bit integer type
type Uint64 uint64
// Copy the value
func (t Uint64) Copy() DataType { return t }
func (t Uint64) size() int {
return 8 - bits.LeadingZeros64(uint64(t))/8
}
func (t Uint64) typeNum() typeNum {
return typeNumUint64
}
// WriteTo writes the value to w.
func (t Uint64) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
size := t.size()
// We ignore leading zeros
for i := size; i > 0; i-- {
err = w.WriteByte(byte(t >> (8 * (i - 1)) & 0xFF))
if err != nil {
return numBytes + int64(size-i), errors.Wrap(err, "error writing uint64")
}
}
return numBytes + int64(size), nil
}
// Uint128 is the MaxMind DB unsigned 128-bit integer type
type Uint128 big.Int
// Copy make a deep copy of the Uint128
func (t *Uint128) Copy() DataType {
nv := big.Int{}
nv.Set((*big.Int)(t))
uv := Uint128(nv)
return &uv
}
func (t *Uint128) size() int {
// We add 7 here as we want the ceiling of the division operation rather
// than the floor.
return ((*big.Int)(t).BitLen() + 7) / 8
}
func (t *Uint128) typeNum() typeNum {
return typeNumUint128
}
// WriteTo writes the value to w.
func (t *Uint128) WriteTo(w writer) (int64, error) {
numBytes, err := writeCtrlByte(w, t)
if err != nil {
return numBytes, err
}
written, err := w.Write((*big.Int)(t).Bytes())
numBytes += int64(written)
if err != nil {
return numBytes, errors.Wrap(err, "error writing uint128")
}
return numBytes, nil
}
const (
firstSize = 29
secondSize = firstSize + 256
thirdSize = secondSize + (1 << 16)
maxSize = thirdSize + (1 << 24)
)
func writeCtrlByte(w writer, t DataType) (int64, error) {
size := t.size()
typeNum := t.typeNum()
var firstByte byte
var secondByte byte
if typeNum < 8 {
firstByte = byte(typeNum << 5)
} else {
firstByte = byte(typeNumExtended << 5)
secondByte = byte(typeNum - 7)
}
leftOver := 0
leftOverSize := 0
switch {
case size < firstSize:
firstByte |= byte(size)
case size <= secondSize:
firstByte |= 29
leftOver = size - firstSize
leftOverSize = 1
case size <= thirdSize:
firstByte |= 30
leftOver = size - secondSize
leftOverSize = 2
case size <= maxSize:
firstByte |= 31
leftOver = size - thirdSize
leftOverSize = 3
default:
return 0, errors.Errorf(
"cannot store %d bytes; max size is %d",
size,
maxSize,
)
}
err := w.WriteByte(firstByte)
if err != nil {
return 0, errors.Wrapf(
err,
"error writing first ctrl byte (type: %d, size: %d)",
typeNum,
size,
)
}
numBytes := int64(1)
if secondByte != 0 {
err = w.WriteByte(secondByte)
if err != nil {
return numBytes, errors.Wrapf(
err,
"error writing second ctrl byte (type: %d, size: %d)",
typeNum,
size,
)
}
numBytes++
}
for i := leftOverSize - 1; i >= 0; i-- {
v := byte((leftOver >> (8 * i)) & 0xFF)
err = w.WriteByte(v)
if err != nil {
return numBytes, errors.Wrapf(
err,
"error writing remaining ctrl bytes (type: %d, size: %d, value: %d)",
typeNum,
size,
v,
)
}
numBytes++
}
return numBytes, nil
}