mirror of
https://github.com/golang/go
synced 2024-11-12 07:50:23 -07:00
encoding/base32: new package
R=rsc CC=Miek Gieben, golang-dev https://golang.org/cl/3926041
This commit is contained in:
parent
007aaa474e
commit
40c7449044
@ -58,6 +58,7 @@ DIRS=\
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debug/proc\
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ebnf\
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encoding/ascii85\
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encoding/base32\
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encoding/base64\
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encoding/binary\
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encoding/git85\
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11
src/pkg/encoding/base32/Makefile
Normal file
11
src/pkg/encoding/base32/Makefile
Normal file
@ -0,0 +1,11 @@
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# Copyright 2009 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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include $(GOROOT)/src/Make.inc
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TARG=encoding/base32
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GOFILES=\
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base32.go\
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include $(GOROOT)/src/Make.pkg
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368
src/pkg/encoding/base32/base32.go
Normal file
368
src/pkg/encoding/base32/base32.go
Normal file
@ -0,0 +1,368 @@
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package base32 implements base32 encoding as specified by RFC 4648.
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package base32
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import (
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"io"
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"os"
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"strconv"
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)
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/*
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* Encodings
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*/
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// An Encoding is a radix 32 encoding/decoding scheme, defined by a
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// 32-character alphabet. The most common is the "base32" encoding
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// introduced for SASL GSSAPI and standardized in RFC 4648.
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// The alternate "base32hex" encoding is used in DNSSEC.
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type Encoding struct {
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encode string
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decodeMap [256]byte
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}
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const encodeStd = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"
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const encodeHex = "0123456789ABCDEFGHIJKLMNOPQRSTUV"
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// NewEncoding returns a new Encoding defined by the given alphabet,
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// which must be a 32-byte string.
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func NewEncoding(encoder string) *Encoding {
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e := new(Encoding)
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e.encode = encoder
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for i := 0; i < len(e.decodeMap); i++ {
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e.decodeMap[i] = 0xFF
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}
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for i := 0; i < len(encoder); i++ {
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e.decodeMap[encoder[i]] = byte(i)
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}
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return e
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}
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// StdEncoding is the standard base32 encoding, as defined in
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// RFC 4648.
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var StdEncoding = NewEncoding(encodeStd)
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// HexEncoding is the ``Extended Hex Alphabet'' defined in RFC 4648.
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// It is typically used in DNS.
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var HexEncoding = NewEncoding(encodeHex)
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/*
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* Encoder
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*/
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// Encode encodes src using the encoding enc, writing
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// EncodedLen(len(src)) bytes to dst.
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//
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// The encoding pads the output to a multiple of 8 bytes,
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// so Encode is not appropriate for use on individual blocks
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// of a large data stream. Use NewEncoder() instead.
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func (enc *Encoding) Encode(dst, src []byte) {
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if len(src) == 0 {
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return
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}
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for len(src) > 0 {
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dst[0] = 0
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dst[1] = 0
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dst[2] = 0
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dst[3] = 0
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dst[4] = 0
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dst[5] = 0
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dst[6] = 0
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dst[7] = 0
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// Unpack 8x 5-bit source blocks into a 5 byte
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// destination quantum
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switch len(src) {
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default:
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dst[7] |= src[4] & 0x1F
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dst[6] |= src[4] >> 5
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fallthrough
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case 4:
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dst[6] |= (src[3] << 3) & 0x1F
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dst[5] |= (src[3] >> 2) & 0x1F
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dst[4] |= src[3] >> 7
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fallthrough
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case 3:
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dst[4] |= (src[2] << 1) & 0x1F
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dst[3] |= (src[2] >> 4) & 0x1F
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fallthrough
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case 2:
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dst[3] |= (src[1] << 4) & 0x1F
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dst[2] |= (src[1] >> 1) & 0x1F
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dst[1] |= (src[1] >> 6) & 0x1F
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fallthrough
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case 1:
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dst[1] |= (src[0] << 2) & 0x1F
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dst[0] |= src[0] >> 3
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}
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// Encode 5-bit blocks using the base32 alphabet
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for j := 0; j < 8; j++ {
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dst[j] = enc.encode[dst[j]]
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}
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// Pad the final quantum
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if len(src) < 5 {
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dst[7] = '='
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if len(src) < 4 {
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dst[6] = '='
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dst[5] = '='
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if len(src) < 3 {
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dst[4] = '='
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if len(src) < 2 {
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dst[3] = '='
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dst[2] = '='
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}
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}
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}
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break
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}
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src = src[5:]
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dst = dst[8:]
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}
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}
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type encoder struct {
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err os.Error
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enc *Encoding
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w io.Writer
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buf [5]byte // buffered data waiting to be encoded
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nbuf int // number of bytes in buf
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out [1024]byte // output buffer
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}
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func (e *encoder) Write(p []byte) (n int, err os.Error) {
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if e.err != nil {
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return 0, e.err
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}
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// Leading fringe.
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if e.nbuf > 0 {
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var i int
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for i = 0; i < len(p) && e.nbuf < 5; i++ {
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e.buf[e.nbuf] = p[i]
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e.nbuf++
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}
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n += i
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p = p[i:]
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if e.nbuf < 5 {
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return
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}
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e.enc.Encode(e.out[0:], e.buf[0:])
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if _, e.err = e.w.Write(e.out[0:8]); e.err != nil {
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return n, e.err
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}
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e.nbuf = 0
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}
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// Large interior chunks.
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for len(p) >= 5 {
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nn := len(e.out) / 8 * 5
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if nn > len(p) {
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nn = len(p)
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}
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nn -= nn % 5
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if nn > 0 {
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e.enc.Encode(e.out[0:], p[0:nn])
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if _, e.err = e.w.Write(e.out[0 : nn/5*8]); e.err != nil {
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return n, e.err
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}
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}
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n += nn
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p = p[nn:]
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}
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// Trailing fringe.
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for i := 0; i < len(p); i++ {
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e.buf[i] = p[i]
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}
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e.nbuf = len(p)
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n += len(p)
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return
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}
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// Close flushes any pending output from the encoder.
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// It is an error to call Write after calling Close.
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func (e *encoder) Close() os.Error {
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// If there's anything left in the buffer, flush it out
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if e.err == nil && e.nbuf > 0 {
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e.enc.Encode(e.out[0:], e.buf[0:e.nbuf])
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e.nbuf = 0
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_, e.err = e.w.Write(e.out[0:8])
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}
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return e.err
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}
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// NewEncoder returns a new base32 stream encoder. Data written to
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// the returned writer will be encoded using enc and then written to w.
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// Base32 encodings operate in 5-byte blocks; when finished
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// writing, the caller must Close the returned encoder to flush any
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// partially written blocks.
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func NewEncoder(enc *Encoding, w io.Writer) io.WriteCloser {
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return &encoder{enc: enc, w: w}
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}
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// EncodedLen returns the length in bytes of the base32 encoding
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// of an input buffer of length n.
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func (enc *Encoding) EncodedLen(n int) int { return (n + 4) / 5 * 8 }
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/*
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* Decoder
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*/
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type CorruptInputError int64
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func (e CorruptInputError) String() string {
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return "illegal base32 data at input byte " + strconv.Itoa64(int64(e))
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}
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// decode is like Decode but returns an additional 'end' value, which
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// indicates if end-of-message padding was encountered and thus any
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// additional data is an error. decode also assumes len(src)%8==0,
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// since it is meant for internal use.
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func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err os.Error) {
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for i := 0; i < len(src)/8 && !end; i++ {
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// Decode quantum using the base32 alphabet
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var dbuf [8]byte
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dlen := 8
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// do the top bytes contain any data?
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dbufloop:
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for j := 0; j < 8; j++ {
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in := src[i*8+j]
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if in == '=' && j >= 2 && i == len(src)/8-1 {
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// We've reached the end and there's
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// padding, the rest should be padded
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for k := j; k < 8; k++ {
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if src[i*8+k] != '=' {
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return n, false, CorruptInputError(i*8 + j)
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}
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}
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dlen = j
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end = true
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break dbufloop
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}
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dbuf[j] = enc.decodeMap[in]
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if dbuf[j] == 0xFF {
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return n, false, CorruptInputError(i*8 + j)
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}
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}
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// Pack 8x 5-bit source blocks into 5 byte destination
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// quantum
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switch dlen {
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case 7, 8:
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dst[i*5+4] = dbuf[6]<<5 | dbuf[7]
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fallthrough
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case 6, 5:
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dst[i*5+3] = dbuf[4]<<7 | dbuf[5]<<2 | dbuf[6]>>3
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fallthrough
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case 4:
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dst[i*5+2] = dbuf[3]<<4 | dbuf[4]>>1
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fallthrough
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case 3:
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dst[i*5+1] = dbuf[1]<<6 | dbuf[2]<<1 | dbuf[3]>>4
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fallthrough
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case 2:
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dst[i*5+0] = dbuf[0]<<3 | dbuf[1]>>2
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}
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switch dlen {
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case 2:
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n += 1
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case 3, 4:
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n += 2
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case 5:
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n += 3
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case 6, 7:
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n += 4
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case 8:
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n += 5
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}
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}
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return n, end, nil
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}
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// Decode decodes src using the encoding enc. It writes at most
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// DecodedLen(len(src)) bytes to dst and returns the number of bytes
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// written. If src contains invalid base32 data, it will return the
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// number of bytes successfully written and CorruptInputError.
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func (enc *Encoding) Decode(dst, src []byte) (n int, err os.Error) {
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if len(src)%8 != 0 {
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return 0, CorruptInputError(len(src) / 8 * 8)
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}
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n, _, err = enc.decode(dst, src)
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return
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}
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type decoder struct {
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err os.Error
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enc *Encoding
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r io.Reader
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end bool // saw end of message
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buf [1024]byte // leftover input
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nbuf int
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out []byte // leftover decoded output
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outbuf [1024 / 8 * 5]byte
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}
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func (d *decoder) Read(p []byte) (n int, err os.Error) {
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if d.err != nil {
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return 0, d.err
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}
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// Use leftover decoded output from last read.
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if len(d.out) > 0 {
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n = copy(p, d.out)
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d.out = d.out[n:]
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return n, nil
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}
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// Read a chunk.
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nn := len(p) / 5 * 8
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if nn < 8 {
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nn = 8
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}
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if nn > len(d.buf) {
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nn = len(d.buf)
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}
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nn, d.err = io.ReadAtLeast(d.r, d.buf[d.nbuf:nn], 8-d.nbuf)
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d.nbuf += nn
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if d.nbuf < 8 {
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return 0, d.err
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}
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// Decode chunk into p, or d.out and then p if p is too small.
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nr := d.nbuf / 8 * 8
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nw := d.nbuf / 8 * 5
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if nw > len(p) {
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nw, d.end, d.err = d.enc.decode(d.outbuf[0:], d.buf[0:nr])
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d.out = d.outbuf[0:nw]
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n = copy(p, d.out)
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d.out = d.out[n:]
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} else {
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n, d.end, d.err = d.enc.decode(p, d.buf[0:nr])
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}
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d.nbuf -= nr
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for i := 0; i < d.nbuf; i++ {
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d.buf[i] = d.buf[i+nr]
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}
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if d.err == nil {
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d.err = err
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}
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return n, d.err
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}
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// NewDecoder constructs a new base32 stream decoder.
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func NewDecoder(enc *Encoding, r io.Reader) io.Reader {
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return &decoder{enc: enc, r: r}
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}
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// DecodedLen returns the maximum length in bytes of the decoded data
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// corresponding to n bytes of base32-encoded data.
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func (enc *Encoding) DecodedLen(n int) int { return n / 8 * 5 }
|
194
src/pkg/encoding/base32/base32_test.go
Normal file
194
src/pkg/encoding/base32/base32_test.go
Normal file
@ -0,0 +1,194 @@
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// Copyright 2009 The Go Authors. All rights reserved.
|
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// Use of this source code is governed by a BSD-style
|
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// license that can be found in the LICENSE file.
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package base32
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import (
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"bytes"
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"io/ioutil"
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"os"
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"testing"
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)
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type testpair struct {
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decoded, encoded string
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}
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var pairs = []testpair{
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// RFC 4648 examples
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{"", ""},
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{"f", "MY======"},
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{"fo", "MZXQ===="},
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{"foo", "MZXW6==="},
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{"foob", "MZXW6YQ="},
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{"fooba", "MZXW6YTB"},
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{"foobar", "MZXW6YTBOI======"},
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// Wikipedia examples, converted to base32
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{"sure.", "ON2XEZJO"},
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{"sure", "ON2XEZI="},
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{"sur", "ON2XE==="},
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{"su", "ON2Q===="},
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{"leasure.", "NRSWC43VOJSS4==="},
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{"easure.", "MVQXG5LSMUXA===="},
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{"asure.", "MFZXK4TFFY======"},
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{"sure.", "ON2XEZJO"},
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}
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var bigtest = testpair{
|
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"Twas brillig, and the slithy toves",
|
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"KR3WC4ZAMJZGS3DMNFTSYIDBNZSCA5DIMUQHG3DJORUHSIDUN53GK4Y=",
|
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}
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func testEqual(t *testing.T, msg string, args ...interface{}) bool {
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if args[len(args)-2] != args[len(args)-1] {
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t.Errorf(msg, args...)
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return false
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}
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return true
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}
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func TestEncode(t *testing.T) {
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for _, p := range pairs {
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buf := make([]byte, StdEncoding.EncodedLen(len(p.decoded)))
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StdEncoding.Encode(buf, []byte(p.decoded))
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testEqual(t, "Encode(%q) = %q, want %q", p.decoded, string(buf), p.encoded)
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}
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}
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func TestEncoder(t *testing.T) {
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for _, p := range pairs {
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bb := &bytes.Buffer{}
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encoder := NewEncoder(StdEncoding, bb)
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encoder.Write([]byte(p.decoded))
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encoder.Close()
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testEqual(t, "Encode(%q) = %q, want %q", p.decoded, bb.String(), p.encoded)
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}
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}
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func TestEncoderBuffering(t *testing.T) {
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input := []byte(bigtest.decoded)
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for bs := 1; bs <= 12; bs++ {
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bb := &bytes.Buffer{}
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encoder := NewEncoder(StdEncoding, bb)
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for pos := 0; pos < len(input); pos += bs {
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end := pos + bs
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if end > len(input) {
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end = len(input)
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}
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n, err := encoder.Write(input[pos:end])
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testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, os.Error(nil))
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testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
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}
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err := encoder.Close()
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testEqual(t, "Close gave error %v, want %v", err, os.Error(nil))
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testEqual(t, "Encoding/%d of %q = %q, want %q", bs, bigtest.decoded, bb.String(), bigtest.encoded)
|
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}
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}
|
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|
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func TestDecode(t *testing.T) {
|
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for _, p := range pairs {
|
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dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
|
||||
count, end, err := StdEncoding.decode(dbuf, []byte(p.encoded))
|
||||
testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, os.Error(nil))
|
||||
testEqual(t, "Decode(%q) = length %v, want %v", p.encoded, count, len(p.decoded))
|
||||
if len(p.encoded) > 0 {
|
||||
testEqual(t, "Decode(%q) = end %v, want %v", p.encoded, end, (p.encoded[len(p.encoded)-1] == '='))
|
||||
}
|
||||
testEqual(t, "Decode(%q) = %q, want %q", p.encoded,
|
||||
string(dbuf[0:count]),
|
||||
p.decoded)
|
||||
}
|
||||
}
|
||||
|
||||
func TestDecoder(t *testing.T) {
|
||||
for _, p := range pairs {
|
||||
decoder := NewDecoder(StdEncoding, bytes.NewBufferString(p.encoded))
|
||||
dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
|
||||
count, err := decoder.Read(dbuf)
|
||||
if err != nil && err != os.EOF {
|
||||
t.Fatal("Read failed", err)
|
||||
}
|
||||
testEqual(t, "Read from %q = length %v, want %v", p.encoded, count, len(p.decoded))
|
||||
testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded)
|
||||
if err != os.EOF {
|
||||
count, err = decoder.Read(dbuf)
|
||||
}
|
||||
testEqual(t, "Read from %q = %v, want %v", p.encoded, err, os.EOF)
|
||||
}
|
||||
}
|
||||
|
||||
func TestDecoderBuffering(t *testing.T) {
|
||||
for bs := 1; bs <= 12; bs++ {
|
||||
decoder := NewDecoder(StdEncoding, bytes.NewBufferString(bigtest.encoded))
|
||||
buf := make([]byte, len(bigtest.decoded)+12)
|
||||
var total int
|
||||
for total = 0; total < len(bigtest.decoded); {
|
||||
n, err := decoder.Read(buf[total : total+bs])
|
||||
testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, os.Error(nil))
|
||||
total += n
|
||||
}
|
||||
testEqual(t, "Decoding/%d of %q = %q, want %q", bs, bigtest.encoded, string(buf[0:total]), bigtest.decoded)
|
||||
}
|
||||
}
|
||||
|
||||
func TestDecodeCorrupt(t *testing.T) {
|
||||
type corrupt struct {
|
||||
e string
|
||||
p int
|
||||
}
|
||||
examples := []corrupt{
|
||||
{"!!!!", 0},
|
||||
{"x===", 0},
|
||||
{"AA=A====", 2},
|
||||
{"AAA=AAAA", 3},
|
||||
{"MMMMMMMMM", 8},
|
||||
{"MMMMMM", 0},
|
||||
}
|
||||
|
||||
for _, e := range examples {
|
||||
dbuf := make([]byte, StdEncoding.DecodedLen(len(e.e)))
|
||||
_, err := StdEncoding.Decode(dbuf, []byte(e.e))
|
||||
switch err := err.(type) {
|
||||
case CorruptInputError:
|
||||
testEqual(t, "Corruption in %q at offset %v, want %v", e.e, int(err), e.p)
|
||||
default:
|
||||
t.Error("Decoder failed to detect corruption in", e)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestBig(t *testing.T) {
|
||||
n := 3*1000 + 1
|
||||
raw := make([]byte, n)
|
||||
const alpha = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
||||
for i := 0; i < n; i++ {
|
||||
raw[i] = alpha[i%len(alpha)]
|
||||
}
|
||||
encoded := new(bytes.Buffer)
|
||||
w := NewEncoder(StdEncoding, encoded)
|
||||
nn, err := w.Write(raw)
|
||||
if nn != n || err != nil {
|
||||
t.Fatalf("Encoder.Write(raw) = %d, %v want %d, nil", nn, err, n)
|
||||
}
|
||||
err = w.Close()
|
||||
if err != nil {
|
||||
t.Fatalf("Encoder.Close() = %v want nil", err)
|
||||
}
|
||||
decoded, err := ioutil.ReadAll(NewDecoder(StdEncoding, encoded))
|
||||
if err != nil {
|
||||
t.Fatalf("ioutil.ReadAll(NewDecoder(...)): %v", err)
|
||||
}
|
||||
|
||||
if !bytes.Equal(raw, decoded) {
|
||||
var i int
|
||||
for i = 0; i < len(decoded) && i < len(raw); i++ {
|
||||
if decoded[i] != raw[i] {
|
||||
break
|
||||
}
|
||||
}
|
||||
t.Errorf("Decode(Encode(%d-byte string)) failed at offset %d", n, i)
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue
Block a user