mirror of
https://github.com/go-gitea/gitea.git
synced 2024-09-08 04:19:36 +02:00
151 lines
3.9 KiB
Go
151 lines
3.9 KiB
Go
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// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package bsoncodec
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import (
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"errors"
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"fmt"
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"math"
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"reflect"
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"go.mongodb.org/mongo-driver/bson/bsonoptions"
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"go.mongodb.org/mongo-driver/bson/bsonrw"
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"go.mongodb.org/mongo-driver/bson/bsontype"
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)
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var defaultUIntCodec = NewUIntCodec()
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// UIntCodec is the Codec used for uint values.
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type UIntCodec struct {
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EncodeToMinSize bool
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}
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var _ ValueCodec = &UIntCodec{}
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// NewUIntCodec returns a UIntCodec with options opts.
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func NewUIntCodec(opts ...*bsonoptions.UIntCodecOptions) *UIntCodec {
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uintOpt := bsonoptions.MergeUIntCodecOptions(opts...)
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codec := UIntCodec{}
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if uintOpt.EncodeToMinSize != nil {
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codec.EncodeToMinSize = *uintOpt.EncodeToMinSize
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}
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return &codec
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}
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// EncodeValue is the ValueEncoder for uint types.
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func (uic *UIntCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
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switch val.Kind() {
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case reflect.Uint8, reflect.Uint16:
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return vw.WriteInt32(int32(val.Uint()))
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case reflect.Uint, reflect.Uint32, reflect.Uint64:
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u64 := val.Uint()
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// If ec.MinSize or if encodeToMinSize is true for a non-uint64 value we should write val as an int32
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useMinSize := ec.MinSize || (uic.EncodeToMinSize && val.Kind() != reflect.Uint64)
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if u64 <= math.MaxInt32 && useMinSize {
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return vw.WriteInt32(int32(u64))
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}
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if u64 > math.MaxInt64 {
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return fmt.Errorf("%d overflows int64", u64)
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}
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return vw.WriteInt64(int64(u64))
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}
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return ValueEncoderError{
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Name: "UintEncodeValue",
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Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
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Received: val,
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}
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}
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// DecodeValue is the ValueDecoder for uint types.
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func (uic *UIntCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
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if !val.CanSet() {
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return ValueDecoderError{
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Name: "UintDecodeValue",
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Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
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Received: val,
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}
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}
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var i64 int64
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var err error
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switch vrType := vr.Type(); vrType {
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case bsontype.Int32:
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i32, err := vr.ReadInt32()
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if err != nil {
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return err
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}
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i64 = int64(i32)
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case bsontype.Int64:
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i64, err = vr.ReadInt64()
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if err != nil {
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return err
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}
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case bsontype.Double:
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f64, err := vr.ReadDouble()
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if err != nil {
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return err
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}
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if !dc.Truncate && math.Floor(f64) != f64 {
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return errors.New("UintDecodeValue can only truncate float64 to an integer type when truncation is enabled")
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}
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if f64 > float64(math.MaxInt64) {
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return fmt.Errorf("%g overflows int64", f64)
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}
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i64 = int64(f64)
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case bsontype.Boolean:
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b, err := vr.ReadBoolean()
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if err != nil {
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return err
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}
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if b {
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i64 = 1
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}
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case bsontype.Null:
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if err = vr.ReadNull(); err != nil {
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return err
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}
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default:
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return fmt.Errorf("cannot decode %v into an integer type", vrType)
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}
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switch val.Kind() {
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case reflect.Uint8:
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if i64 < 0 || i64 > math.MaxUint8 {
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return fmt.Errorf("%d overflows uint8", i64)
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}
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case reflect.Uint16:
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if i64 < 0 || i64 > math.MaxUint16 {
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return fmt.Errorf("%d overflows uint16", i64)
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}
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case reflect.Uint32:
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if i64 < 0 || i64 > math.MaxUint32 {
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return fmt.Errorf("%d overflows uint32", i64)
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}
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case reflect.Uint64:
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if i64 < 0 {
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return fmt.Errorf("%d overflows uint64", i64)
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}
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case reflect.Uint:
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if i64 < 0 || int64(uint(i64)) != i64 { // Can we fit this inside of an uint
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return fmt.Errorf("%d overflows uint", i64)
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}
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default:
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return ValueDecoderError{
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Name: "UintDecodeValue",
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Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
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Received: val,
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}
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}
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val.SetUint(uint64(i64))
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return nil
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}
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