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dynamic.go
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dynamic.go
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package proto
import (
"encoding/binary"
"math"
"sort"
)
type DynamicMessage map[uint64]any
// zigzag encoding types
type (
SInt int
SInt32 int32
SInt64 int64
)
type encoder struct {
buf []byte
}
func (msg DynamicMessage) Encode() []byte {
en := encoder{}
// sort all items
type pair struct {
key uint64
value any
}
all := make([]pair, len(msg))
for k, v := range msg {
all = append(all, pair{key: k, value: v})
}
sort.Slice(all, func(i, j int) bool {
return all[i].key < all[j].key
})
//nolint:staticcheck
for _, item := range all {
key := item.key << 3
switch v := item.value.(type) {
case bool:
en.uvarint(key | 0)
vi := uint64(0)
if v {
vi = 1
}
en.uvarint(vi)
case int:
en.uvarint(key | 0)
en.uvarint(uint64(v))
case uint:
en.uvarint(key | 0)
en.uvarint(uint64(v))
case int32:
en.uvarint(key | 0)
en.uvarint(uint64(v))
case int64:
en.uvarint(key | 0)
en.uvarint(uint64(v))
case uint32:
en.uvarint(key | 0)
en.uvarint(uint64(v))
case uint64:
en.uvarint(key | 0)
en.uvarint(v)
case SInt:
en.uvarint(key | 0)
en.svarint(int64(v))
case SInt32:
en.uvarint(key | 0)
en.svarint(int64(v))
case SInt64:
en.uvarint(key | 0)
en.svarint(int64(v))
case float32:
en.uvarint(key | 5)
en.u32(math.Float32bits(v))
case float64:
en.uvarint(key | 1)
en.u64(math.Float64bits(v))
case string:
en.uvarint(key | 2)
en.uvarint(uint64(len(v)))
en.buf = append(en.buf, v...)
case []uint64:
for i := 0; i < len(v); i++ {
en.uvarint(key | 0)
en.uvarint(v[i])
}
case []byte:
en.uvarint(key | 2)
en.uvarint(uint64(len(v)))
en.buf = append(en.buf, v...)
case DynamicMessage:
en.uvarint(key | 2)
b := v.Encode()
en.uvarint(uint64(len(b)))
en.buf = append(en.buf, b...)
}
}
return en.buf
}
func (en *encoder) uvarint(v uint64) {
en.buf = binary.AppendUvarint(en.buf, v)
}
func (en *encoder) svarint(v int64) {
en.buf = binary.AppendVarint(en.buf, v)
}
func (en *encoder) u32(v uint32) {
en.buf = binary.LittleEndian.AppendUint32(en.buf, v)
}
func (en *encoder) u64(v uint64) {
en.buf = binary.LittleEndian.AppendUint64(en.buf, v)
}