working commit

vendor/github.com/tetratelabs/wabin/binary/table.go

@@ -0,0 +1,45 @@
+package binary
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/tetratelabs/wabin/wasm"
+)
+
+// decodeTable returns the wasm.Table decoded with the WebAssembly Binary Format.
+//
+// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-table
+func decodeTable(r *bytes.Reader, features wasm.CoreFeatures) (*wasm.Table, error) {
+	tableType, err := r.ReadByte()
+	if err != nil {
+		return nil, fmt.Errorf("read leading byte: %v", err)
+	}
+
+	if tableType != wasm.RefTypeFuncref {
+		if err := features.RequireEnabled(wasm.CoreFeatureReferenceTypes); err != nil {
+			return nil, fmt.Errorf("table type funcref is invalid: %w", err)
+		}
+	}
+
+	min, max, err := decodeLimitsType(r)
+	if err != nil {
+		return nil, fmt.Errorf("read limits: %v", err)
+	}
+	if min > wasm.MaximumFunctionIndex {
+		return nil, fmt.Errorf("table min must be at most %d", wasm.MaximumFunctionIndex)
+	}
+	if max != nil {
+		if *max < min {
+			return nil, fmt.Errorf("table size minimum must not be greater than maximum")
+		}
+	}
+	return &wasm.Table{Min: min, Max: max, Type: tableType}, nil
+}
+
+// encodeTable returns the wasm.Table encoded in WebAssembly Binary Format.
+//
+// See https://www.w3.org/TR/2019/REC-wasm-core-1-20191205/#binary-table
+func encodeTable(i *wasm.Table) []byte {
+	return append([]byte{i.Type}, encodeLimitsType(i.Min, i.Max)...)
+}