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encoding/base32, encoding/base64: a small stack-space optimization.

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R=dsymonds, dave
CC=golang-dev
https://golang.org/cl/7568045
This commit is contained in:
Nigel Tao 2013-03-12 11:24:24 +11:00
parent 2f2271db7a
commit 96e0c0c764
2 changed files with 11 additions and 11 deletions
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12
src/pkg/encoding/base32/base32.go
View File

@ -230,7 +230,7 @@ func (e CorruptInputError) Error() string {
// indicates if end-of-message padding was encountered and thus any
// additional data is an error.
func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
osrc := src
olen := len(src)
for len(src) > 0 && !end {
// Decode quantum using the base32 alphabet
var dbuf [8]byte
@ -238,7 +238,7 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
for j := 0; j < 8; {
if len(src) == 0 {
return n, false, CorruptInputError(len(osrc) - len(src) - j)
return n, false, CorruptInputError(olen - len(src) - j)
}
in := src[0]
src = src[1:]
@ -250,12 +250,12 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
// We've reached the end and there's padding
if len(src)+j < 8-1 {
// not enough padding
return n, false, CorruptInputError(len(osrc))
return n, false, CorruptInputError(olen)
}
for k := 0; k < 8-1-j; k++ {
if len(src) > k && src[k] != '=' {
// incorrect padding
return n, false, CorruptInputError(len(osrc) - len(src) + k - 1)
return n, false, CorruptInputError(olen - len(src) + k - 1)
}
}
dlen, end = j, true
@ -265,13 +265,13 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
// Examples" for an illustration for how the the 1st, 3rd and 6th base32
// src bytes do not yield enough information to decode a dst byte.
if dlen == 1 || dlen == 3 || dlen == 6 {
return n, false, CorruptInputError(len(osrc) - len(src) - 1)
return n, false, CorruptInputError(olen - len(src) - 1)
}
break
}
dbuf[j] = enc.decodeMap[in]
if dbuf[j] == 0xFF {
return n, false, CorruptInputError(len(osrc) - len(src) - 1)
return n, false, CorruptInputError(olen - len(src) - 1)
}
j++
}

10
src/pkg/encoding/base64/base64.go
View File

@ -210,7 +210,7 @@ func (e CorruptInputError) Error() string {
// indicates if end-of-message padding was encountered and thus any
// additional data is an error.
func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
osrc := src
olen := len(src)
for len(src) > 0 && !end {
// Decode quantum using the base64 alphabet
var dbuf [4]byte
@ -218,7 +218,7 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
for j := 0; j < 4; {
if len(src) == 0 {
return n, false, CorruptInputError(len(osrc) - len(src) - j)
return n, false, CorruptInputError(olen - len(src) - j)
}
in := src[0]
src = src[1:]
@ -230,18 +230,18 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
// We've reached the end and there's padding
if len(src)+j < 4-1 {
// not enough padding
return n, false, CorruptInputError(len(osrc))
return n, false, CorruptInputError(olen)
}
if len(src) > 0 && src[0] != '=' {
// incorrect padding
return n, false, CorruptInputError(len(osrc) - len(src) - 1)
return n, false, CorruptInputError(olen - len(src) - 1)
}
dlen, end = j, true
break
}
dbuf[j] = enc.decodeMap[in]
if dbuf[j] == 0xFF {
return n, false, CorruptInputError(len(osrc) - len(src) - 1)
return n, false, CorruptInputError(olen - len(src) - 1)
}
j++
}