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@@ -0,0 +1,530 @@
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+package maxminddb
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+
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+import (
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+ "encoding/binary"
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+ "fmt"
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+ "math"
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+ "math/big"
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+ "reflect"
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+ "sync"
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+)
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+
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+type decoder struct {
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+ buffer []byte
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+}
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+
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+type dataType int
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+
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+const (
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+ _Extended dataType = iota
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+ _Pointer
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+ _String
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+ _Float64
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+ _Bytes
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+ _Uint16
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+ _Uint32
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+ _Map
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+ _Int32
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+ _Uint64
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+ _Uint128
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+ _Slice
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+ _Container
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+ _Marker
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+ _Bool
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+ _Float32
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+)
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+
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+func (d *decoder) decode(offset uint, result reflect.Value) (uint, error) {
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+ typeNum, size, newOffset := d.decodeCtrlData(offset)
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+ return d.decodeFromType(typeNum, size, newOffset, result)
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+}
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+
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+func (d *decoder) decodeCtrlData(offset uint) (dataType, uint, uint) {
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+ newOffset := offset + 1
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+ ctrlByte := d.buffer[offset]
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+
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+ typeNum := dataType(ctrlByte >> 5)
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+ if typeNum == _Extended {
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+ typeNum = dataType(d.buffer[newOffset] + 7)
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+ newOffset++
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+ }
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+
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+ var size uint
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+ size, newOffset = d.sizeFromCtrlByte(ctrlByte, newOffset, typeNum)
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+ return typeNum, size, newOffset
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+}
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+
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+func (d *decoder) sizeFromCtrlByte(ctrlByte byte, offset uint, typeNum dataType) (uint, uint) {
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+ size := uint(ctrlByte & 0x1f)
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+ if typeNum == _Extended {
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+ return size, offset
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+ }
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+
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+ var bytesToRead uint
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+ if size > 28 {
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+ bytesToRead = size - 28
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+ }
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+
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+ newOffset := offset + bytesToRead
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+ sizeBytes := d.buffer[offset:newOffset]
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+
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+ switch {
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+ case size == 29:
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+ size = 29 + uint(sizeBytes[0])
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+ case size == 30:
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+ size = 285 + uint(uintFromBytes(0, sizeBytes))
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+ case size > 30:
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+ size = uint(uintFromBytes(0, sizeBytes)) + 65821
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+ }
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+ return size, newOffset
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+}
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+
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+func (d *decoder) decodeFromType(dtype dataType, size uint, offset uint, result reflect.Value) (uint, error) {
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+ if result.Kind() == reflect.Ptr {
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+ result = reflect.Indirect(result)
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+ }
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+
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+ switch dtype {
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+ case _Bool:
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+ return d.unmarshalBool(size, offset, result)
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+ case _Bytes:
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+ return d.unmarshalBytes(size, offset, result)
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+ case _Float32:
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+ return d.unmarshalFloat32(size, offset, result)
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+ case _Float64:
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+ return d.unmarshalFloat64(size, offset, result)
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+ case _Int32:
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+ return d.unmarshalInt32(size, offset, result)
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+ case _Map:
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+ return d.unmarshalMap(size, offset, result)
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+ case _Pointer:
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+ return d.unmarshalPointer(size, offset, result)
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+ case _Slice:
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+ return d.unmarshalSlice(size, offset, result)
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+ case _String:
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+ return d.unmarshalString(size, offset, result)
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+ case _Uint16:
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+ return d.unmarshalUint(size, offset, result, 16)
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+ case _Uint32:
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+ return d.unmarshalUint(size, offset, result, 32)
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+ case _Uint64:
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+ return d.unmarshalUint(size, offset, result, 64)
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+ case _Uint128:
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+ return d.unmarshalUint128(size, offset, result)
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+ default:
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+ return 0, newInvalidDatabaseError("unknown type: %d", dtype)
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+ }
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+}
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+
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+func (d *decoder) unmarshalBool(size uint, offset uint, result reflect.Value) (uint, error) {
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+ if size > 1 {
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+ return 0, newInvalidDatabaseError("the MaxMind DB file's data section contains bad data (bool size of %v)", size)
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+ }
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+ value, newOffset, err := d.decodeBool(size, offset)
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+ if err != nil {
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+ return 0, err
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+ }
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+ switch result.Kind() {
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+ default:
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+ return newOffset, fmt.Errorf("trying to unmarshal %v into %v", value, result.Type())
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+ case reflect.Bool:
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+ result.SetBool(value)
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+ return newOffset, nil
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+ case reflect.Interface:
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+ result.Set(reflect.ValueOf(value))
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+ return newOffset, nil
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+ }
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+}
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+
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+func (d *decoder) unmarshalBytes(size uint, offset uint, result reflect.Value) (uint, error) {
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+
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+ value, newOffset, err := d.decodeBytes(size, offset)
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+ if err != nil {
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+ return 0, err
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+ }
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+ switch result.Kind() {
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+ default:
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+ return newOffset, fmt.Errorf("trying to unmarshal %v into %v", value, result.Type())
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+ case reflect.Slice:
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+ result.SetBytes(value)
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+ return newOffset, nil
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+ case reflect.Interface:
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+ result.Set(reflect.ValueOf(value))
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+ return newOffset, nil
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+ }
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+}
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+
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+func (d *decoder) unmarshalFloat32(size uint, offset uint, result reflect.Value) (uint, error) {
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+ if size != 4 {
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+ return 0, newInvalidDatabaseError("the MaxMind DB file's data section contains bad data (float32 size of %v)", size)
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+ }
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+ value, newOffset, err := d.decodeFloat32(size, offset)
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+ if err != nil {
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+ return 0, err
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+ }
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+
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+ switch result.Kind() {
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+ default:
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+ return newOffset, fmt.Errorf("trying to unmarshal %v into %v", value, result.Type())
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+ case reflect.Float32, reflect.Float64:
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+ result.SetFloat(float64(value))
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+ return newOffset, nil
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+ case reflect.Interface:
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+ result.Set(reflect.ValueOf(value))
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+ return newOffset, nil
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+ }
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+}
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+
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+func (d *decoder) unmarshalFloat64(size uint, offset uint, result reflect.Value) (uint, error) {
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+
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+ if size != 8 {
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+ return 0, newInvalidDatabaseError("the MaxMind DB file's data section contains bad data (float 64 size of %v)", size)
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+ }
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+ value, newOffset, err := d.decodeFloat64(size, offset)
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+ if err != nil {
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+ return 0, err
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+ }
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+ switch result.Kind() {
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+ default:
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+ return newOffset, fmt.Errorf("trying to unmarshal %v into %v", value, result.Type())
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+ case reflect.Float32, reflect.Float64:
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+ result.SetFloat(value)
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+ return newOffset, nil
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+ case reflect.Interface:
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+ result.Set(reflect.ValueOf(value))
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+ return newOffset, nil
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+ }
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+}
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+
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+func (d *decoder) unmarshalInt32(size uint, offset uint, result reflect.Value) (uint, error) {
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+ if size > 4 {
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+ return 0, newInvalidDatabaseError("the MaxMind DB file's data section contains bad data (int32 size of %v)", size)
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+ }
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+ value, newOffset, err := d.decodeInt(size, offset)
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+ if err != nil {
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+ return 0, err
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+ }
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+
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+ switch result.Kind() {
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+ default:
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+ return newOffset, fmt.Errorf("trying to unmarshal %v into %v", value, result.Type())
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+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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+ result.SetInt(int64(value))
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+ return newOffset, nil
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+ case reflect.Interface:
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+ result.Set(reflect.ValueOf(value))
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+ return newOffset, nil
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+ }
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+}
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+
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+func (d *decoder) unmarshalMap(size uint, offset uint, result reflect.Value) (uint, error) {
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+ switch result.Kind() {
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+ default:
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+ return 0, fmt.Errorf("trying to unmarshal a map into %v", result.Type())
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+ case reflect.Struct:
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+ return d.decodeStruct(size, offset, result)
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+ case reflect.Map:
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+ return d.decodeMap(size, offset, result)
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+ case reflect.Interface:
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+ rv := reflect.ValueOf(make(map[string]interface{}, size))
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+ newOffset, err := d.decodeMap(size, offset, rv)
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+ result.Set(rv)
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+ return newOffset, err
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+ }
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+}
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+
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+func (d *decoder) unmarshalPointer(size uint, offset uint, result reflect.Value) (uint, error) {
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+ pointer, newOffset := d.decodePointer(size, offset)
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+ _, err := d.decode(pointer, result)
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+ return newOffset, err
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+}
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+
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+func (d *decoder) unmarshalSlice(size uint, offset uint, result reflect.Value) (uint, error) {
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+
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+ switch result.Kind() {
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+ default:
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+ return 0, fmt.Errorf("trying to unmarshal an array into %v", result.Type())
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+ case reflect.Slice:
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+ return d.decodeSlice(size, offset, result)
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+ case reflect.Interface:
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+ a := []interface{}{}
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+ rv := reflect.ValueOf(&a).Elem()
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+ newOffset, err := d.decodeSlice(size, offset, rv)
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+ result.Set(rv)
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+ return newOffset, err
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+ }
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+}
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+
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+func (d *decoder) unmarshalString(size uint, offset uint, result reflect.Value) (uint, error) {
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+
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+ value, newOffset, err := d.decodeString(size, offset)
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+
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+ if err != nil {
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+ return 0, err
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+ }
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+ switch result.Kind() {
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+ default:
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+ return newOffset, fmt.Errorf("trying to unmarshal %v into %v", value, result.Type())
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+ case reflect.String:
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+ result.SetString(value)
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+ return newOffset, nil
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+ case reflect.Interface:
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+ result.Set(reflect.ValueOf(value))
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+ return newOffset, nil
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+ }
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+}
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+
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+func (d *decoder) unmarshalUint(size uint, offset uint, result reflect.Value, uintType uint) (uint, error) {
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+ if size > uintType/8 {
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+ return 0, newInvalidDatabaseError("the MaxMind DB file's data section contains bad data (uint%v size of %v)", uintType, size)
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+ }
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+
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+ value, newOffset, err := d.decodeUint(size, offset)
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+ if err != nil {
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+ return 0, err
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+ }
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+
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+ switch result.Kind() {
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+ default:
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+ return newOffset, fmt.Errorf("trying to unmarshal %v into %v", value, result.Type())
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+ case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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+ result.SetUint(value)
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+ return newOffset, nil
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+ case reflect.Interface:
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+ result.Set(reflect.ValueOf(value))
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+ return newOffset, nil
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+ }
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+}
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+
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+func (d *decoder) unmarshalUint128(size uint, offset uint, result reflect.Value) (uint, error) {
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+ if size > 16 {
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+ return 0, newInvalidDatabaseError("the MaxMind DB file's data section contains bad data (uint128 size of %v)", size)
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+ }
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+ value, newOffset, err := d.decodeUint128(size, offset)
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+ if err != nil {
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+ return 0, err
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+ }
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+
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+ // XXX - this should allow *big.Int rather than just bigInt
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+ // Currently this is reported as invalid
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+ switch result.Kind() {
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+ default:
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+ return newOffset, fmt.Errorf("trying to unmarshal %v into %v", value, result.Type())
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+ case reflect.Struct:
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+ result.Set(reflect.ValueOf(*value))
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+ return newOffset, nil
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+ case reflect.Interface, reflect.Ptr:
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+ result.Set(reflect.ValueOf(value))
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+ return newOffset, nil
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+ }
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+}
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+
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+func (d *decoder) decodeBool(size uint, offset uint) (bool, uint, error) {
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+ return size != 0, offset, nil
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+}
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+
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+func (d *decoder) decodeBytes(size uint, offset uint) ([]byte, uint, error) {
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+ newOffset := offset + size
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+ bytes := make([]byte, size)
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+ copy(bytes, d.buffer[offset:newOffset])
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+ return bytes, newOffset, nil
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+}
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+
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+func (d *decoder) decodeFloat64(size uint, offset uint) (float64, uint, error) {
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+ newOffset := offset + size
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+ bits := binary.BigEndian.Uint64(d.buffer[offset:newOffset])
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+ return math.Float64frombits(bits), newOffset, nil
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+}
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+
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+func (d *decoder) decodeFloat32(size uint, offset uint) (float32, uint, error) {
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+ newOffset := offset + size
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+ bits := binary.BigEndian.Uint32(d.buffer[offset:newOffset])
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+ return math.Float32frombits(bits), newOffset, nil
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+}
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+
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+func (d *decoder) decodeInt(size uint, offset uint) (int, uint, error) {
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+ newOffset := offset + size
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+ var val int32
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+ for _, b := range d.buffer[offset:newOffset] {
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+ val = (val << 8) | int32(b)
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+ }
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+ return int(val), newOffset, nil
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+}
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+
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+func (d *decoder) decodeMap(size uint, offset uint, result reflect.Value) (uint, error) {
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+ if result.IsNil() {
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+ result.Set(reflect.MakeMap(result.Type()))
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+ }
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+
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+ for i := uint(0); i < size; i++ {
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+ var key string
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+ var err error
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+ key, offset, err = d.decodeKeyString(offset)
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+
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+ if err != nil {
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+ return 0, err
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+ }
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+
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+ value := reflect.New(result.Type().Elem())
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+ offset, err = d.decode(offset, value)
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+ if err != nil {
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+ return 0, err
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+ }
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+ result.SetMapIndex(reflect.ValueOf(key), value.Elem())
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+ }
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+ return offset, nil
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+}
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+
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+func (d *decoder) decodePointer(size uint, offset uint) (uint, uint) {
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+ pointerSize := ((size >> 3) & 0x3) + 1
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+ newOffset := offset + pointerSize
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+ pointerBytes := d.buffer[offset:newOffset]
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+ var prefix uint64
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+ if pointerSize == 4 {
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+ prefix = 0
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+ } else {
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+ prefix = uint64(size & 0x7)
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+ }
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+ unpacked := uint(uintFromBytes(prefix, pointerBytes))
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+
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+ var pointerValueOffset uint
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+ switch pointerSize {
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+ case 1:
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+ pointerValueOffset = 0
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+ case 2:
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+ pointerValueOffset = 2048
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+ case 3:
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+ pointerValueOffset = 526336
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+ case 4:
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+ pointerValueOffset = 0
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+ }
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+
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+ pointer := unpacked + pointerValueOffset
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+
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+ return pointer, newOffset
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+}
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+
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+func (d *decoder) decodeSlice(size uint, offset uint, result reflect.Value) (uint, error) {
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+ result.Set(reflect.MakeSlice(result.Type(), int(size), int(size)))
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+ for i := 0; i < int(size); i++ {
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+ var err error
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+ offset, err = d.decode(offset, result.Index(i))
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+ if err != nil {
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+ return 0, err
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+ }
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+ }
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+ return offset, nil
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+}
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+
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+func (d *decoder) decodeString(size uint, offset uint) (string, uint, error) {
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+ newOffset := offset + size
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+ return string(d.buffer[offset:newOffset]), newOffset, nil
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+}
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+
|
|
|
+var (
|
|
|
+ fieldMap = map[reflect.Type]map[string]int{}
|
|
|
+ fieldMapMu sync.RWMutex
|
|
|
+)
|
|
|
+
|
|
|
+func (d *decoder) decodeStruct(size uint, offset uint, result reflect.Value) (uint, error) {
|
|
|
+ resultType := result.Type()
|
|
|
+
|
|
|
+ fieldMapMu.RLock()
|
|
|
+ fields, ok := fieldMap[resultType]
|
|
|
+ fieldMapMu.RUnlock()
|
|
|
+ if !ok {
|
|
|
+ numFields := resultType.NumField()
|
|
|
+ fields = make(map[string]int, numFields)
|
|
|
+ for i := 0; i < numFields; i++ {
|
|
|
+ fieldType := resultType.Field(i)
|
|
|
+
|
|
|
+ fieldName := fieldType.Name
|
|
|
+ if tag := fieldType.Tag.Get("maxminddb"); tag != "" {
|
|
|
+ fieldName = tag
|
|
|
+ }
|
|
|
+ fields[fieldName] = i
|
|
|
+ }
|
|
|
+ fieldMapMu.Lock()
|
|
|
+ fieldMap[resultType] = fields
|
|
|
+ fieldMapMu.Unlock()
|
|
|
+ }
|
|
|
+
|
|
|
+ for i := uint(0); i < size; i++ {
|
|
|
+ var (
|
|
|
+ err error
|
|
|
+ key string
|
|
|
+ )
|
|
|
+ key, offset, err = d.decodeStructKey(offset)
|
|
|
+ if err != nil {
|
|
|
+ return 0, err
|
|
|
+ }
|
|
|
+ i, ok := fields[key]
|
|
|
+ if !ok {
|
|
|
+ offset = d.nextValueOffset(offset, 1)
|
|
|
+ continue
|
|
|
+ }
|
|
|
+ offset, err = d.decode(offset, result.Field(i))
|
|
|
+ if err != nil {
|
|
|
+ return 0, err
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return offset, nil
|
|
|
+}
|
|
|
+
|
|
|
+func (d *decoder) decodeUint(size uint, offset uint) (uint64, uint, error) {
|
|
|
+ newOffset := offset + size
|
|
|
+ val := uintFromBytes(0, d.buffer[offset:newOffset])
|
|
|
+
|
|
|
+ return val, newOffset, nil
|
|
|
+}
|
|
|
+
|
|
|
+func (d *decoder) decodeUint128(size uint, offset uint) (*big.Int, uint, error) {
|
|
|
+ newOffset := offset + size
|
|
|
+ val := new(big.Int)
|
|
|
+ val.SetBytes(d.buffer[offset:newOffset])
|
|
|
+
|
|
|
+ return val, newOffset, nil
|
|
|
+}
|
|
|
+
|
|
|
+func uintFromBytes(prefix uint64, uintBytes []byte) uint64 {
|
|
|
+ val := prefix
|
|
|
+ for _, b := range uintBytes {
|
|
|
+ val = (val << 8) | uint64(b)
|
|
|
+ }
|
|
|
+ return val
|
|
|
+}
|
|
|
+
|
|
|
+func (d *decoder) decodeKeyString(offset uint) (string, uint, error) {
|
|
|
+ typeNum, size, newOffset := d.decodeCtrlData(offset)
|
|
|
+ if typeNum == _Pointer {
|
|
|
+ pointer, ptrOffset := d.decodePointer(size, newOffset)
|
|
|
+ key, _, err := d.decodeKeyString(pointer)
|
|
|
+ return key, ptrOffset, err
|
|
|
+ }
|
|
|
+ if typeNum != _String {
|
|
|
+ return "", 0, newInvalidDatabaseError("unexpected type when decoding string: %v", typeNum)
|
|
|
+ }
|
|
|
+ return d.decodeString(size, newOffset)
|
|
|
+}
|
|
|
+
|
|
|
+// This function is used to skip ahead to the next value without decoding
|
|
|
+// the one at the offset passed in. The size bits have different meanings for
|
|
|
+// different data types
|
|
|
+func (d *decoder) nextValueOffset(offset uint, numberToSkip uint) uint {
|
|
|
+ if numberToSkip == 0 {
|
|
|
+ return offset
|
|
|
+ }
|
|
|
+ typeNum, size, offset := d.decodeCtrlData(offset)
|
|
|
+ switch typeNum {
|
|
|
+ case _Pointer:
|
|
|
+ _, offset = d.decodePointer(size, offset)
|
|
|
+ case _Map:
|
|
|
+ numberToSkip += 2 * size
|
|
|
+ case _Slice:
|
|
|
+ numberToSkip += size
|
|
|
+ case _Bool:
|
|
|
+ default:
|
|
|
+ offset += size
|
|
|
+ }
|
|
|
+ return d.nextValueOffset(offset, numberToSkip-1)
|
|
|
+}
|