fix: heisi

plugin/heisi/packer.go

@@ -0,0 +1,48 @@
+package heisi
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+	"math/bits"
+)
+
+const (
+	template2021    = "http://hs.heisiwu.com/wp-content/uploads/%4d/%02d/%4d%02d16%06d-611a3%8s.jpg"
+	templategeneral = "http://hs.heisiwu.com/wp-content/uploads/%4d/%02d/%015x"
+)
+
+type item [10]byte
+
+// String item to url
+func (it item) String() string {
+	year, month := int((it[0]>>4)&0x0f), int(it[0]&0x0f)
+	year += 2021
+	if year == 2021 {
+		num := binary.BigEndian.Uint32(it[1:5])
+		dstr := hex.EncodeToString(it[5:9])
+		return fmt.Sprintf(template2021, year, month, year, month, num, dstr)
+	}
+	d := binary.BigEndian.Uint64(it[1:9])
+	isscaled := it[9]&0x80 > 0
+	num := int(it[9] & 0x7f)
+	trestore := fmt.Sprintf(templategeneral, year, month, d&0x0fffffff_ffffffff)
+	if num > 0 {
+		trestore += fmt.Sprintf("-%d", num)
+	}
+	if isscaled {
+		trestore += "-scaled"
+	}
+	d = bits.RotateLeft64(d, 4) & 0x0f
+	switch d {
+	case 0:
+		trestore += ".jpg"
+	case 1:
+		trestore += ".png"
+	case 2:
+		trestore += ".webp"
+	default:
+		return "invalid ext"
+	}
+	return trestore
+}