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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| package ssz | ||
|
|
||
| import ( | ||
| "reflect" | ||
|
|
||
| "github.com/ledgerwatch/erigon-lib/common" | ||
| libcommon "github.com/ledgerwatch/erigon-lib/common" | ||
| "github.com/ledgerwatch/erigon-lib/common/length" | ||
| ) | ||
|
|
||
| // This package is a working progress. only base functionality is supported. no more no less. | ||
|
|
||
| // Decodes just decodes a specific struct. | ||
| func Decode(x any, buf []byte) error { | ||
| // Get values in struct. | ||
| reflValue := reflect.ValueOf(x) | ||
| reflType := reflect.TypeOf(x) | ||
|
|
||
| // Iterate over all the fields. | ||
| _, err := decodeValue(reflValue, reflType, buf) | ||
| return err | ||
|
|
||
| } | ||
|
|
||
| func decodeValue(reflValue reflect.Value, reflType reflect.Type, buf []byte) (int, error) { | ||
| if reflValue.Kind() == reflect.Ptr { | ||
| reflValue = reflValue.Elem() | ||
| reflType = reflType.Elem() | ||
| } | ||
| pos := 0 | ||
| for i := 0; i < reflValue.NumField(); i++ { | ||
| // Process each field. | ||
| field := reflValue.Field(i) | ||
| if !field.CanInterface() || reflType.Field(i).Tag.Get(TagSSZ) != TagTrueFlag { | ||
| continue | ||
| } | ||
| switch fieldVal := field.Interface().(type) { | ||
| // Base field can just be appended | ||
| case uint64: | ||
| if len(buf) < 8 { | ||
| return 0, ErrLowBufferSize | ||
| } | ||
| num := UnmarshalUint64SSZ(buf[pos:]) | ||
| field.Set(reflect.ValueOf(num)) | ||
| pos += 8 | ||
| case libcommon.Hash: | ||
| if len(buf) < length.Hash { | ||
| return 0, ErrLowBufferSize | ||
| } | ||
| field.Set(reflect.ValueOf(common.BytesToHash(buf[pos : pos+length.Hash]))) | ||
| pos += length.Hash | ||
| // Will be fixed in the future. | ||
| case [32]byte: | ||
| if len(buf) < length.Hash { | ||
| return 0, ErrLowBufferSize | ||
| } | ||
| field.Set(reflect.ValueOf(common.BytesToHash(buf[pos : pos+length.Hash]))) | ||
| pos += length.Hash | ||
| case [48]byte: | ||
| var val [48]byte | ||
| if len(buf) < 48 { | ||
| return 0, ErrLowBufferSize | ||
| } | ||
| copy(val[:], buf[pos:]) | ||
| field.Set(reflect.ValueOf(val)) | ||
| pos += 48 | ||
| case [96]byte: | ||
| var val [96]byte | ||
| if len(buf) < 96 { | ||
| return 0, ErrLowBufferSize | ||
| } | ||
| copy(val[:], buf[pos:]) | ||
| field.Set(reflect.ValueOf(val)) | ||
| pos += 96 | ||
| case [4]byte: | ||
| var val [4]byte | ||
| if len(buf) < 4 { | ||
| return 0, ErrLowBufferSize | ||
| } | ||
| copy(val[:], buf[pos:]) | ||
| field.Set(reflect.ValueOf(val)) | ||
| pos += 4 | ||
| case libcommon.Address: | ||
| if len(buf) < length.Addr { | ||
| return 0, ErrLowBufferSize | ||
| } | ||
| field.Set(reflect.ValueOf(common.BytesToAddress(buf[pos : pos+length.Addr]))) | ||
| pos += length.Addr | ||
| case bool: | ||
| if len(buf) == 0 { | ||
| return 0, ErrLowBufferSize | ||
| } | ||
| if buf[pos] == 0x01 { | ||
| field.Set(reflect.ValueOf(true)) | ||
| } else { | ||
| field.Set(reflect.ValueOf(false)) | ||
| } | ||
| pos++ | ||
| default: | ||
| // Create pointer to default. | ||
| t := reflect.TypeOf(fieldVal) | ||
| v := reflect.New(t.Elem()) | ||
| n, err := decodeValue(v, t, buf[pos:]) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| field.Set(v) | ||
| pos += n | ||
| } | ||
| } | ||
| return pos, nil | ||
| } |
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