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Diffstat (limited to 'src/net/textproto/reader.go')
| -rw-r--r-- | src/net/textproto/reader.go | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/net/textproto/reader.go b/src/net/textproto/reader.go index 9a21777df8..c1284fde25 100644 --- a/src/net/textproto/reader.go +++ b/src/net/textproto/reader.go @@ -503,6 +503,12 @@ func readMIMEHeader(r *Reader, lim int64) (MIMEHeader, error) { m := make(MIMEHeader, hint) + // Account for 400 bytes of overhead for the MIMEHeader, plus 200 bytes per entry. + // Benchmarking map creation as of go1.20, a one-entry MIMEHeader is 416 bytes and large + // MIMEHeaders average about 200 bytes per entry. + lim -= 400 + const mapEntryOverhead = 200 + // The first line cannot start with a leading space. if buf, err := r.R.Peek(1); err == nil && (buf[0] == ' ' || buf[0] == '\t') { line, err := r.readLineSlice() @@ -538,7 +544,7 @@ func readMIMEHeader(r *Reader, lim int64) (MIMEHeader, error) { vv := m[key] if vv == nil { lim -= int64(len(key)) - lim -= 100 // map entry overhead + lim -= mapEntryOverhead } lim -= int64(len(value)) if lim < 0 { |