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make stripNewlines always copy while filtering newlines

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This commit is contained in:
Sven Taute 2019-03-10 16:52:42 +01:00
parent 0e84a56944
commit f4be3cf55c
1 changed files with 14 additions and 16 deletions
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30
src/encoding/base32/base32.go
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@ -364,19 +364,17 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
// New line characters (\r and \n) are ignored.
func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
buf := make([]byte, len(src))
copy(buf, src)
l := stripNewlines(buf)
l := stripNewlines(buf, src)
n, _, err = enc.decode(dst, buf[:l])
return
}
// DecodeString returns the bytes represented by the base32 string s.
func (enc *Encoding) DecodeString(s string) ([]byte, error) {
dbuf := make([]byte, enc.DecodedLen(len(s)))
src := []byte(s)
l := stripNewlines(src)
n, _, err := enc.decode(dbuf, src[:l])
return dbuf[:n], err
buf := []byte(s)
l := stripNewlines(buf, buf)
n, _, err := enc.decode(buf, buf[:l])
return buf[:n], err
}
type decoder struct {
@ -492,16 +490,15 @@ type newlineFilteringReader struct {
}
// stripNewlines removes newline characters and returns the number
// of non-newline characters moved to the beginning of p.
func stripNewlines(p []byte) int {
// of non-newline characters copied to dst.
func stripNewlines(dst, src []byte) int {
offset := 0
for i, b := range p {
if b != '\r' && b != '\n' {
if i > offset {
p[offset] = b
}
offset++
for _, b := range src {
if b == '\r' || b == '\n' {
continue
}
dst[offset] = b
offset++
}
return offset
}
@ -509,7 +506,8 @@ func stripNewlines(p []byte) int {
func (r *newlineFilteringReader) Read(p []byte) (int, error) {
n, err := r.wrapped.Read(p)
for n > 0 {
offset := stripNewlines(p[:n])
s := p[0:n]
offset := stripNewlines(s, s)
if err != nil || offset > 0 {
return offset, err
}