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hash.go
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hash.go
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package ghash
import (
"bufio"
"bytes"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"fmt"
gsync "github.com/snail007/gmc/util/sync"
"golang.org/x/crypto/blake2s"
"hash"
"hash/crc32"
"io"
"os"
"strings"
"sync"
"time"
)
const bufferSize = 65536
func MD5(str string) string {
return Md5Bytes([]byte(str))
}
func Md5Bytes(d []byte) string {
return fmt.Sprintf("%x", md5.Sum(d))
}
func MD5File(filename string) (string, error) {
return sumFile(md5.New(), filename)
}
func MD5Reader(reader io.ReadCloser) (string, error) {
return sumReader(md5.New(), reader)
}
func SHA256(str string) string {
s, _ := sumReader(sha256.New(), newStringCloser(str))
return s
}
func SHA256Bytes(b []byte) string {
s, _ := sumReader(sha256.New(), newReaderCloser(bytes.NewReader(b)))
return s
}
func SHA256File(filename string) (string, error) {
return sumFile(sha256.New(), filename)
}
func SHA256Reader(reader io.ReadCloser) (string, error) {
return sumReader(sha256.New(), reader)
}
func SHA1(str string) string {
s, _ := sumReader(sha1.New(), newStringCloser(str))
return s
}
func SHA1Bytes(b []byte) string {
s, _ := sumReader(sha1.New(), newReaderCloser(bytes.NewReader(b)))
return s
}
func SHA1sumFile(filename string) (string, error) {
return sumFile(sha1.New(), filename)
}
func SHA1Reader(reader io.ReadCloser) (string, error) {
return sumReader(sha1.New(), reader)
}
func Blake2s256(str string) string {
hash, _ := blake2s.New256([]byte{})
s, _ := sumReader(hash, newStringCloser(str))
return s
}
func Blake2s256Bytes(b []byte) string {
hash, _ := blake2s.New256([]byte{})
s, _ := sumReader(hash, newReaderCloser(bytes.NewReader(b)))
return s
}
func Blake2s256File(filename string) (string, error) {
hash, _ := blake2s.New256([]byte{})
return sumFile(hash, filename)
}
func Blake2s256Reader(reader io.ReadCloser) (string, error) {
hash, _ := blake2s.New256([]byte{})
return sumReader(hash, reader)
}
func CRC32(str string) string {
s, _ := CRC32Reader(newStringCloser(str))
return s
}
func CRC32Bytes(b []byte) string {
s, _ := CRC32Reader(newReaderCloser(bytes.NewReader(b)))
return s
}
func CRC32File(filename string) (string, error) {
if info, err := os.Stat(filename); err != nil || info.IsDir() {
return "", err
}
file, err := os.Open(filename)
if err != nil {
return "", err
}
defer func() { _ = file.Close() }()
return CRC32Reader(bufio.NewReader(file))
}
func CRC32Reader(reader io.Reader) (string, error) {
table := crc32.MakeTable(crc32.IEEE)
checkSum := crc32.Checksum([]byte(""), table)
buf := make([]byte, bufferSize)
for {
switch n, err := reader.Read(buf); err {
case nil:
checkSum = crc32.Update(checkSum, table, buf[:n])
case io.EOF:
return fmt.Sprintf("%08x", checkSum), nil
default:
return "", err
}
}
}
// sumReader calculates the hash based on a provided hash provider
func sumReader(hashAlgorithm hash.Hash, reader io.ReadCloser) (string, error) {
buf := make([]byte, bufferSize)
t := time.AfterFunc(time.Second*30, func() {
reader.Close()
})
defer t.Stop()
for {
t.Reset(time.Second * 30)
switch n, err := reader.Read(buf); err {
case nil:
hashAlgorithm.Write(buf[:n])
case io.EOF:
return fmt.Sprintf("%x", hashAlgorithm.Sum(nil)), nil
default:
return "", err
}
}
}
type readerCloser struct {
io.Reader
}
func newReaderCloser(r io.Reader) *readerCloser {
return &readerCloser{Reader: r}
}
func (s *readerCloser) Close() error {
return nil
}
func newStringCloser(str string) io.ReadCloser {
return newReaderCloser(strings.NewReader(str))
}
// sumFile calculates the hash based on a provided hash provider
func sumFile(hashAlgorithm hash.Hash, filename string) (string, error) {
if info, err := os.Stat(filename); err != nil || info.IsDir() {
return "", err
}
var file *os.File
var err error
g := sync.WaitGroup{}
g.Add(1)
go func() {
defer g.Done()
file, err = os.Open(filename)
}()
select {
case <-gsync.WaitGroupToChan(&g):
case <-time.After(time.Second * 3):
return "", fmt.Errorf("open file timeout, %s", filename)
}
if err != nil {
return "", err
}
defer func() { _ = file.Close() }()
return sumReader(hashAlgorithm, newBufReaderCloser(file))
}
type bufReaderCloser struct {
*bufio.Reader
f *os.File
}
func (s *bufReaderCloser) Close() error {
if s.f != nil {
return s.f.Close()
}
return nil
}
func newBufReaderCloser(f *os.File) *bufReaderCloser {
return &bufReaderCloser{
f: f,
Reader: bufio.NewReaderSize(f, 1024*8),
}
}