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[dev.fuzz] internal/fuzz: support corpus file encoding/decoding
Change-Id: Id245ce5f154557f1744210e7d7f061d08901c746 Reviewed-on: https://go-review.googlesource.com/c/go/+/290951 Trust: Katie Hockman <katie@golang.org> Run-TryBot: Katie Hockman <katie@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Jay Conrod <jayconrod@google.com>
This commit is contained in:
Katie Hockman
parent
7743f60b5a
commit
9cbf92c52b
2 changed files with 355 additions and 0 deletions
240
src/internal/fuzz/encoding.go
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240
src/internal/fuzz/encoding.go
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package fuzz
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import (
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"bytes"
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"fmt"
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"go/ast"
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"go/parser"
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"go/token"
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"strconv"
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)
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// encVersion1 will be the first line of a file with version 1 encoding.
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var encVersion1 = "version 1"
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// marshalCorpusFile encodes an arbitrary number of arguments into the file format for the
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// corpus.
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func marshalCorpusFile(vals ...interface{}) []byte {
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if len(vals) == 0 {
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panic("must have at least one value to encode")
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}
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b := bytes.NewBuffer([]byte(encVersion1))
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// TODO(katiehockman): keep uint8 and int32 encoding where applicable,
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// instead of changing to byte and rune respectively.
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for _, val := range vals {
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switch t := val.(type) {
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case int, int8, int16, int64, uint, uint16, uint32, uint64, uintptr, float32, float64, bool:
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fmt.Fprintf(b, "\n%T(%v)", t, t)
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case string:
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fmt.Fprintf(b, "\nstring(%q)", t)
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case rune: // int32
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fmt.Fprintf(b, "\nrune(%q)", t)
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case byte: // uint8
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fmt.Fprintf(b, "\nbyte(%q)", t)
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case []byte: // []uint8
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fmt.Fprintf(b, "\n[]byte(%q)", t)
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default:
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panic(fmt.Sprintf("unsupported type: %T", t))
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}
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}
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return b.Bytes()
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}
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// unmarshalCorpusFile decodes corpus bytes into their respective values.
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func unmarshalCorpusFile(b []byte) ([]interface{}, error) {
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if len(b) == 0 {
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return nil, fmt.Errorf("cannot decode empty string")
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}
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lines := bytes.Split(b, []byte("\n"))
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if len(lines) < 2 {
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return nil, fmt.Errorf("must include version and at least one value")
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}
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if string(lines[0]) != encVersion1 {
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return nil, fmt.Errorf("unknown encoding version: %s", lines[0])
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}
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var vals []interface{}
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for _, line := range lines[1:] {
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line = bytes.TrimSpace(line)
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if len(line) == 0 {
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continue
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}
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v, err := parseCorpusValue(line)
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if err != nil {
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return nil, fmt.Errorf("malformed line %q: %v", line, err)
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}
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vals = append(vals, v)
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}
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return vals, nil
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}
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func parseCorpusValue(line []byte) (interface{}, error) {
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fs := token.NewFileSet()
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expr, err := parser.ParseExprFrom(fs, "(test)", line, 0)
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if err != nil {
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return nil, err
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}
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call, ok := expr.(*ast.CallExpr)
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if !ok {
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return nil, fmt.Errorf("expected call expression")
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}
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if len(call.Args) != 1 {
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return nil, fmt.Errorf("expected call expression with 1 argument; got %d", len(call.Args))
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}
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arg := call.Args[0]
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if arrayType, ok := call.Fun.(*ast.ArrayType); ok {
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if arrayType.Len != nil {
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return nil, fmt.Errorf("expected []byte or primitive type")
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}
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elt, ok := arrayType.Elt.(*ast.Ident)
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if !ok || elt.Name != "byte" {
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return nil, fmt.Errorf("expected []byte")
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}
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lit, ok := arg.(*ast.BasicLit)
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if !ok || lit.Kind != token.STRING {
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return nil, fmt.Errorf("string literal required for type []byte")
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}
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s, err := strconv.Unquote(lit.Value)
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if err != nil {
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return nil, err
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}
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return []byte(s), nil
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}
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idType, ok := call.Fun.(*ast.Ident)
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if !ok {
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return nil, fmt.Errorf("expected []byte or primitive type")
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}
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if idType.Name == "bool" {
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id, ok := arg.(*ast.Ident)
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if !ok {
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return nil, fmt.Errorf("malformed bool")
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}
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if id.Name == "true" {
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return true, nil
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} else if id.Name == "false" {
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return false, nil
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} else {
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return nil, fmt.Errorf("true or false required for type bool")
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}
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}
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var (
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val string
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kind token.Token
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)
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if op, ok := arg.(*ast.UnaryExpr); ok {
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// Special case for negative numbers.
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lit, ok := op.X.(*ast.BasicLit)
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if !ok || (lit.Kind != token.INT && lit.Kind != token.FLOAT) {
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return nil, fmt.Errorf("expected operation on int or float type")
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}
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if op.Op != token.SUB {
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return nil, fmt.Errorf("unsupported operation on int: %v", op.Op)
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}
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val = op.Op.String() + lit.Value // e.g. "-" + "124"
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kind = lit.Kind
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} else {
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lit, ok := arg.(*ast.BasicLit)
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if !ok {
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return nil, fmt.Errorf("literal value required for primitive type")
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}
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val, kind = lit.Value, lit.Kind
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}
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switch typ := idType.Name; typ {
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case "string":
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if kind != token.STRING {
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return nil, fmt.Errorf("string literal value required for type string")
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}
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return strconv.Unquote(val)
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case "byte", "rune":
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if kind != token.CHAR {
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return nil, fmt.Errorf("character literal required for byte/rune types")
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}
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n := len(val)
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if n < 2 {
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return nil, fmt.Errorf("malformed character literal, missing single quotes")
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}
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code, _, _, err := strconv.UnquoteChar(val[1:n-1], '\'')
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if err != nil {
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return nil, err
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}
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if typ == "rune" {
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return code, nil
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}
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if code >= 256 {
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return nil, fmt.Errorf("can only encode single byte to a byte type")
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}
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return byte(code), nil
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case "int", "int8", "int16", "int32", "int64":
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if kind != token.INT {
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return nil, fmt.Errorf("integer literal required for int types")
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}
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return parseInt(val, typ)
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case "uint", "uint8", "uint16", "uint32", "uint64":
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if kind != token.INT {
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return nil, fmt.Errorf("integer literal required for uint types")
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}
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return parseUint(val, typ)
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case "float32":
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if kind != token.FLOAT {
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return nil, fmt.Errorf("float literal required for float32 type")
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}
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v, err := strconv.ParseFloat(val, 32)
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return float32(v), err
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case "float64":
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if kind != token.FLOAT {
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return nil, fmt.Errorf("float literal required for float64 type")
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}
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return strconv.ParseFloat(val, 64)
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default:
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return nil, fmt.Errorf("expected []byte or primitive type")
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}
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}
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// parseInt returns an integer of value val and type typ.
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func parseInt(val, typ string) (interface{}, error) {
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switch typ {
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case "int":
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return strconv.Atoi(val)
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case "int8":
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i, err := strconv.ParseInt(val, 10, 8)
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return int8(i), err
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case "int16":
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i, err := strconv.ParseInt(val, 10, 16)
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return int16(i), err
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case "int32":
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i, err := strconv.ParseInt(val, 10, 32)
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return int32(i), err
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case "int64":
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return strconv.ParseInt(val, 10, 64)
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default:
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panic("unreachable")
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}
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}
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// parseInt returns an unsigned integer of value val and type typ.
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func parseUint(val, typ string) (interface{}, error) {
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switch typ {
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case "uint":
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i, err := strconv.ParseUint(val, 10, 0)
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return uint(i), err
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case "uint8":
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i, err := strconv.ParseUint(val, 10, 8)
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return uint8(i), err
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case "uint16":
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i, err := strconv.ParseUint(val, 10, 16)
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return uint16(i), err
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case "uint32":
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i, err := strconv.ParseUint(val, 10, 32)
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return uint32(i), err
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case "uint64":
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return strconv.ParseUint(val, 10, 64)
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default:
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panic("unreachable")
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}
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}
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