Migrate package imports from next.orly.dev to new orly domain structure; add new varint and binary encoders with comprehensive tests; enhance existing tag and envelope implementations with additional methods, validations, and test coverage; introduce shared test.sh script for streamlined testing across modules.

pkg/encoders/varint/varint.go

@@ -0,0 +1,45 @@
+// Package varint is a variable integer encoding that works in reverse compared
+// to the stdlib binary Varint. The terminal byte in the encoding is the one
+// with the 8th bit set. This is basically like a base 128 encoding. It reads
+// forward using an io.Reader and writes forward using an io.Writer.
+package varint
+
+import (
+	"io"
+
+	"golang.org/x/exp/constraints"
+	"lol.mleku.dev/chk"
+)
+
+func Encode[V constraints.Integer](w io.Writer, v V) {
+	x := []byte{0}
+	for {
+		x[0] = byte(v) & 127
+		v >>= 7
+		if v == 0 {
+			x[0] |= 128
+			_, _ = w.Write(x)
+			break
+		} else {
+			_, _ = w.Write(x)
+		}
+	}
+}
+
+func Decode(r io.Reader) (v uint64, err error) {
+	x := []byte{0}
+	v += uint64(x[0])
+	var i uint64
+	for {
+		if _, err = r.Read(x); chk.E(err) {
+			return
+		}
+		if x[0] >= 128 {
+			v += uint64(x[0]&127) << (i * 7)
+			return
+		} else {
+			v += uint64(x[0]) << (i * 7)
+			i++
+		}
+	}
+}