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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package email
import (
"bufio"
"bytes"
"regexp"
"strings"
)
func ParsePatch(message []byte) (diff string) {
s := bufio.NewScanner(bytes.NewReader(message))
diffStarted := false
for s.Scan() {
ln := s.Text()
if lineMatchesDiffStart(ln) {
diffStarted = true
diff += ln + "\n"
continue
}
if diffStarted {
if ln == "--" || ln == "-- " || ln != "" && ln[0] == '>' {
diffStarted = false
continue
}
if ln == "" || strings.HasPrefix(ln, " ") || strings.HasPrefix(ln, "+") ||
strings.HasPrefix(ln, "-") || strings.HasPrefix(ln, "@") ||
strings.HasPrefix(ln, "================") {
diff += ln + "\n"
continue
}
diffStarted = false
}
}
if diff != "" {
diff = strings.TrimRight(diff, "\n") + "\n"
}
err := s.Err()
if err == bufio.ErrTooLong {
// It's a problem of the incoming patch, rather than anything else.
// Anyway, if a patch contains too long lines, we're probably not
// interested in it, so let's pretent we didn't see it.
diff = ""
return
} else if err != nil {
panic("error while scanning from memory: " + err.Error())
}
return
}
var diffRegexps = []*regexp.Regexp{
regexp.MustCompile(`^(---|\+\+\+) [^\s]`),
regexp.MustCompile(`^diff --git`),
regexp.MustCompile(`^index [0-9a-f]+\.\.[0-9a-f]+`),
regexp.MustCompile(`^new file mode [0-9]+`),
regexp.MustCompile(`^Index: [^\s]`),
}
func lineMatchesDiffStart(ln string) bool {
for _, re := range diffRegexps {
if re.MatchString(ln) {
return true
}
}
return false
}
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