Initial commit: SRDB - High-performance LSM-Tree database

- Core engine with MemTable, SST, WAL
- B+Tree indexing for SST files  
- Leveled compaction strategy
- Multi-table database management
- Schema validation and secondary indexes
- Query builder with complex conditions
- Web UI with HTMX for data visualization
- Command-line tools for diagnostics

sst/encoding.go

@@ -0,0 +1,98 @@
+package sst
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/json"
+	"fmt"
+)
+
+// 二进制编码格式:
+// [Magic: 4 bytes][Seq: 8 bytes][Time: 8 bytes][DataLen: 4 bytes][Data: variable]
+
+const (
+	RowMagic = 0x524F5733 // "ROW3"
+)
+
+// encodeRowBinary 使用二进制格式编码行数据
+func encodeRowBinary(row *Row) ([]byte, error) {
+	buf := new(bytes.Buffer)
+
+	// 写入 Magic Number (用于验证)
+	if err := binary.Write(buf, binary.LittleEndian, uint32(RowMagic)); err != nil {
+		return nil, err
+	}
+
+	// 写入 Seq
+	if err := binary.Write(buf, binary.LittleEndian, row.Seq); err != nil {
+		return nil, err
+	}
+
+	// 写入 Time
+	if err := binary.Write(buf, binary.LittleEndian, row.Time); err != nil {
+		return nil, err
+	}
+
+	// 序列化用户数据 (仍使用 JSON，但只序列化用户数据部分)
+	dataBytes, err := json.Marshal(row.Data)
+	if err != nil {
+		return nil, err
+	}
+
+	// 写入数据长度
+	if err := binary.Write(buf, binary.LittleEndian, uint32(len(dataBytes))); err != nil {
+		return nil, err
+	}
+
+	// 写入数据
+	if _, err := buf.Write(dataBytes); err != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+// decodeRowBinary 解码二进制格式的行数据
+func decodeRowBinary(data []byte) (*Row, error) {
+	buf := bytes.NewReader(data)
+
+	// 读取并验证 Magic Number
+	var magic uint32
+	if err := binary.Read(buf, binary.LittleEndian, &magic); err != nil {
+		return nil, err
+	}
+	if magic != RowMagic {
+		return nil, fmt.Errorf("invalid row magic: %x", magic)
+	}
+
+	row := &Row{}
+
+	// 读取 Seq
+	if err := binary.Read(buf, binary.LittleEndian, &row.Seq); err != nil {
+		return nil, err
+	}
+
+	// 读取 Time
+	if err := binary.Read(buf, binary.LittleEndian, &row.Time); err != nil {
+		return nil, err
+	}
+
+	// 读取数据长度
+	var dataLen uint32
+	if err := binary.Read(buf, binary.LittleEndian, &dataLen); err != nil {
+		return nil, err
+	}
+
+	// 读取数据
+	dataBytes := make([]byte, dataLen)
+	if _, err := buf.Read(dataBytes); err != nil {
+		return nil, err
+	}
+
+	// 反序列化用户数据
+	if err := json.Unmarshal(dataBytes, &row.Data); err != nil {
+		return nil, err
+	}
+
+	return row, nil
+}