Moving blockchain code into separate files (no code changes).

blockchain/Block Record Profile.go

@@ -0,0 +1,70 @@
+/*
+File Name:  Block Record Profile.go
+Copyright:  2021 Peernet s.r.o.
+Author:     Peter Kleissner
+
+Profile records:
+Offset  Size    Info
+0       2       Type
+2       ?       Data according to the type
+
+*/
+
+package blockchain
+
+import (
+	"encoding/binary"
+	"errors"
+	"math"
+)
+
+// BlockRecordProfile provides information about the end user.
+type BlockRecordProfile struct {
+	Type uint16 // See ProfileX constants.
+	Data []byte // Data
+}
+
+// decodeBlockRecordProfile decodes only profile records. Other records are ignored.
+func decodeBlockRecordProfile(recordsRaw []BlockRecordRaw) (fields []BlockRecordProfile, err error) {
+	fieldMap := make(map[uint16][]byte)
+
+	for _, record := range recordsRaw {
+		if record.Type != RecordTypeProfile {
+			continue
+		}
+
+		if len(record.Data) < 2 {
+			return nil, errors.New("profile record invalid size")
+		}
+
+		fieldType := binary.LittleEndian.Uint16(record.Data[0:2])
+		fieldMap[fieldType] = record.Data[2:]
+	}
+
+	for fieldType, fieldData := range fieldMap {
+		fields = append(fields, BlockRecordProfile{Type: fieldType, Data: fieldData})
+	}
+
+	return fields, nil
+}
+
+// encodeBlockRecordProfile encodes the profile record.
+func encodeBlockRecordProfile(fields []BlockRecordProfile) (recordsRaw []BlockRecordRaw, err error) {
+	if len(fields) > math.MaxUint16 {
+		return nil, errors.New("exceeding max count of fields")
+	}
+
+	for n := range fields {
+		if len(fields[n].Data) > math.MaxUint32 {
+			return nil, errors.New("exceeding max field size")
+		}
+
+		data := make([]byte, 2)
+		binary.LittleEndian.PutUint16(data[0:2], fields[n].Type)
+		data = append(data, fields[n].Data...)
+
+		recordsRaw = append(recordsRaw, BlockRecordRaw{Type: RecordTypeProfile, Data: data})
+	}
+
+	return recordsRaw, nil
+}