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// Copyright 2014 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 main
import (
"encoding/hex"
"fmt"
"io/ioutil"
"regexp"
"strconv"
"strings"
"testing"
)
// mustParseHexdumpFile returns a block of data generated by
// parsing the hex dump in the named file.
// If the file cannot be read or does not contain a valid hex dump,
// mustParseHexdumpFile calls t.Fatal.
func mustParseHexdumpFile(t *testing.T, file string) []byte {
hex, err := ioutil.ReadFile(file)
if err != nil {
t.Fatal(err)
}
data, err := parseHexdump(string(hex))
if err != nil {
t.Fatal(err)
}
return data
}
// parseHexdump parses the hex dump in text, which should be the
// output of "hexdump -C" or Plan 9's "xd -b",
// and returns the original data used to produce the dump.
// It is meant to enable storing golden binary files as text, so that
// changes to the golden files can be seen during code reviews.
func parseHexdump(text string) ([]byte, error) {
var out []byte
for _, line := range strings.Split(text, "\n") {
if i := strings.Index(line, "|"); i >= 0 { // remove text dump
line = line[:i]
}
f := strings.Fields(line)
if len(f) > 1+16 {
return nil, fmt.Errorf("parsing hex dump: too many fields on line %q", line)
}
if len(f) == 0 || len(f) == 1 && f[0] == "*" { // all zeros block omitted
continue
}
addr64, err := strconv.ParseUint(f[0], 16, 0)
if err != nil {
return nil, fmt.Errorf("parsing hex dump: invalid address %q", f[0])
}
addr := int(addr64)
if len(out) < addr {
out = append(out, make([]byte, addr-len(out))...)
}
for _, x := range f[1:] {
val, err := strconv.ParseUint(x, 16, 8)
if err != nil {
return nil, fmt.Errorf("parsing hexdump: invalid hex byte %q", x)
}
out = append(out, byte(val))
}
}
return out, nil
}
func hexdump(data []byte) string {
text := hex.Dump(data) + fmt.Sprintf("%08x\n", len(data))
text = regexp.MustCompile(`\n([0-9a-f]+(\s+00){16}.*\n)+`).ReplaceAllString(text, "\n*\n")
return text
}
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