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doc/talks/io2010: handle the errors

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R=golang-dev, dsymonds, dsymonds, r
CC=golang-dev
https://golang.org/cl/4771041
This commit is contained in:
Andrew Gerrand 2011-07-19 14:10:12 +10:00
parent 42effdf096
commit 894222f9de
2 changed files with 91 additions and 22 deletions
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75
doc/talks/io2010/decrypt.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This code differs from the slides in that it handles errors.
package main
import (
@ -9,32 +11,75 @@ import (
"crypto/cipher"
"compress/gzip"
"io"
"log"
"os"
)
func EncryptAndGzip(dstfile, srcfile string, key, iv []byte) {
r, _ := os.Open(srcfile)
func EncryptAndGzip(dstfile, srcfile string, key, iv []byte) os.Error {
r, err := os.Open(srcfile)
if err != nil {
return err
}
var w io.Writer
w, _ = os.Create(dstfile)
c, _ := aes.NewCipher(key)
w, err = os.Create(dstfile)
if err != nil {
return err
}
c, err := aes.NewCipher(key)
if err != nil {
return err
}
w = cipher.StreamWriter{S: cipher.NewOFB(c, iv), W: w}
w2, _ := gzip.NewWriter(w)
io.Copy(w2, r)
w2.Close()
w2, err := gzip.NewWriter(w)
if err != nil {
return err
}
defer w2.Close()
_, err = io.Copy(w2, r)
return err
}
func DecryptAndGunzip(dstfile, srcfile string, key, iv []byte) {
f, _ := os.Open(srcfile)
func DecryptAndGunzip(dstfile, srcfile string, key, iv []byte) os.Error {
f, err := os.Open(srcfile)
if err != nil {
return err
}
defer f.Close()
c, _ := aes.NewCipher(key)
c, err := aes.NewCipher(key)
if err != nil {
return err
}
r := cipher.StreamReader{S: cipher.NewOFB(c, iv), R: f}
r2, _ := gzip.NewReader(r)
w, _ := os.Create(dstfile)
r2, err := gzip.NewReader(r)
if err != nil {
return err
}
w, err := os.Create(dstfile)
if err != nil {
return err
}
defer w.Close()
io.Copy(w, r2)
_, err = io.Copy(w, r2)
return err
}
func main() {
EncryptAndGzip("/tmp/passwd.gz", "/etc/passwd", make([]byte, 16), make([]byte, 16))
DecryptAndGunzip("/dev/stdout", "/tmp/passwd.gz", make([]byte, 16), make([]byte, 16))
err := EncryptAndGzip(
"/tmp/passwd.gz",
"/etc/passwd",
make([]byte, 16),
make([]byte, 16),
)
if err != nil {
log.Fatal(err)
}
err = DecryptAndGunzip(
"/dev/stdout",
"/tmp/passwd.gz",
make([]byte, 16),
make([]byte, 16),
)
if err != nil {
log.Fatal(err)
}
}

38
doc/talks/io2010/encrypt.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This code differs from the slides in that it handles errors.
package main
import (
@ -9,20 +11,42 @@ import (
"crypto/cipher"
"compress/gzip"
"io"
"log"
"os"
)
func EncryptAndGzip(dstfile, srcfile string, key, iv []byte) {
r, _ := os.Open(srcfile)
func EncryptAndGzip(dstfile, srcfile string, key, iv []byte) os.Error {
r, err := os.Open(srcfile)
if err != nil {
return err
}
var w io.WriteCloser
w, _ = os.Create(dstfile)
w, err = os.Create(dstfile)
if err != nil {
return err
}
defer w.Close()
w, _ = gzip.NewWriter(w)
w, err = gzip.NewWriter(w)
if err != nil {
return err
}
defer w.Close()
c, _ := aes.NewCipher(key)
io.Copy(cipher.StreamWriter{S: cipher.NewOFB(c, iv), W: w}, r)
c, err := aes.NewCipher(key)
if err != nil {
return err
}
_, err = io.Copy(cipher.StreamWriter{S: cipher.NewOFB(c, iv), W: w}, r)
return err
}
func main() {
EncryptAndGzip("/tmp/passwd.gz", "/etc/passwd", make([]byte, 16), make([]byte, 16))
err := EncryptAndGzip(
"/tmp/passwd.gz",
"/etc/passwd",
make([]byte, 16),
make([]byte, 16),
)
if err != nil {
log.Fatal(err)
}
}