Initialize module and dependencies

vendor/golang.org/x/vuln/internal/scan/extract.go

@@ -0,0 +1,60 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package scan
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"sort"
+
+	"golang.org/x/vuln/internal/derrors"
+	"golang.org/x/vuln/internal/vulncheck"
+)
+
+const (
+	// extractModeID is the unique name of the extract mode protocol
+	extractModeID      = "govulncheck-extract"
+	extractModeVersion = "0.1.0"
+)
+
+// header information for the blob output.
+type header struct {
+	Name    string `json:"name"`
+	Version string `json:"version"`
+}
+
+// runExtract dumps the extracted abstraction of binary at cfg.patterns to out.
+// It prints out exactly two blob messages, one with the header and one with
+// the vulncheck.Bin as the body.
+func runExtract(cfg *config, out io.Writer) (err error) {
+	defer derrors.Wrap(&err, "govulncheck")
+
+	bin, err := createBin(cfg.patterns[0])
+	if err != nil {
+		return err
+	}
+	sortBin(bin) // sort for easier testing and validation
+	header := header{
+		Name:    extractModeID,
+		Version: extractModeVersion,
+	}
+
+	enc := json.NewEncoder(out)
+
+	if err := enc.Encode(header); err != nil {
+		return fmt.Errorf("marshaling blob header: %v", err)
+	}
+	if err := enc.Encode(bin); err != nil {
+		return fmt.Errorf("marshaling blob body: %v", err)
+	}
+	return nil
+}
+
+func sortBin(bin *vulncheck.Bin) {
+	sort.SliceStable(bin.PkgSymbols, func(i, j int) bool {
+		return bin.PkgSymbols[i].Pkg+"."+bin.PkgSymbols[i].Name < bin.PkgSymbols[j].Pkg+"."+bin.PkgSymbols[j].Name
+	})
+}