mirror of
https://codeberg.org/forgejo/forgejo
synced 2024-12-05 02:54:46 +01:00
12a1f914f4
* update github.com/alecthomas/chroma v0.8.0 -> v0.8.1 * github.com/blevesearch/bleve v1.0.10 -> v1.0.12 * editorconfig-core-go v2.1.1 -> v2.3.7 * github.com/gliderlabs/ssh v0.2.2 -> v0.3.1 * migrate editorconfig.ParseBytes to Parse * github.com/shurcooL/vfsgen to 0d455de96546 * github.com/go-git/go-git/v5 v5.1.0 -> v5.2.0 * github.com/google/uuid v1.1.1 -> v1.1.2 * github.com/huandu/xstrings v1.3.0 -> v1.3.2 * github.com/klauspost/compress v1.10.11 -> v1.11.1 * github.com/markbates/goth v1.61.2 -> v1.65.0 * github.com/mattn/go-sqlite3 v1.14.0 -> v1.14.4 * github.com/mholt/archiver v3.3.0 -> v3.3.2 * github.com/microcosm-cc/bluemonday 4f7140c49acb -> v1.0.4 * github.com/minio/minio-go v7.0.4 -> v7.0.5 * github.com/olivere/elastic v7.0.9 -> v7.0.20 * github.com/urfave/cli v1.20.0 -> v1.22.4 * github.com/prometheus/client_golang v1.1.0 -> v1.8.0 * github.com/xanzy/go-gitlab v0.37.0 -> v0.38.1 * mvdan.cc/xurls v2.1.0 -> v2.2.0 Co-authored-by: Lauris BH <lauris@nix.lv>
376 lines
9.7 KiB
Go
Vendored
376 lines
9.7 KiB
Go
Vendored
package rardecode
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"errors"
|
|
"io"
|
|
"io/ioutil"
|
|
"os"
|
|
"time"
|
|
)
|
|
|
|
// FileHeader HostOS types
|
|
const (
|
|
HostOSUnknown = 0
|
|
HostOSMSDOS = 1
|
|
HostOSOS2 = 2
|
|
HostOSWindows = 3
|
|
HostOSUnix = 4
|
|
HostOSMacOS = 5
|
|
HostOSBeOS = 6
|
|
)
|
|
|
|
const (
|
|
maxPassword = 128
|
|
)
|
|
|
|
var (
|
|
errShortFile = errors.New("rardecode: decoded file too short")
|
|
errInvalidFileBlock = errors.New("rardecode: invalid file block")
|
|
errUnexpectedArcEnd = errors.New("rardecode: unexpected end of archive")
|
|
errBadFileChecksum = errors.New("rardecode: bad file checksum")
|
|
)
|
|
|
|
type byteReader interface {
|
|
io.Reader
|
|
io.ByteReader
|
|
}
|
|
|
|
type limitedReader struct {
|
|
r io.Reader
|
|
n int64 // bytes remaining
|
|
shortErr error // error returned when r returns io.EOF with n > 0
|
|
}
|
|
|
|
func (l *limitedReader) Read(p []byte) (int, error) {
|
|
if l.n <= 0 {
|
|
return 0, io.EOF
|
|
}
|
|
if int64(len(p)) > l.n {
|
|
p = p[0:l.n]
|
|
}
|
|
n, err := l.r.Read(p)
|
|
l.n -= int64(n)
|
|
if err == io.EOF && l.n > 0 {
|
|
return n, l.shortErr
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
type limitedByteReader struct {
|
|
limitedReader
|
|
br io.ByteReader
|
|
}
|
|
|
|
func (l *limitedByteReader) ReadByte() (byte, error) {
|
|
if l.n <= 0 {
|
|
return 0, io.EOF
|
|
}
|
|
c, err := l.br.ReadByte()
|
|
if err == nil {
|
|
l.n--
|
|
} else if err == io.EOF && l.n > 0 {
|
|
return 0, l.shortErr
|
|
}
|
|
return c, err
|
|
}
|
|
|
|
// limitByteReader returns a limitedByteReader that reads from r and stops with
|
|
// io.EOF after n bytes.
|
|
// If r returns an io.EOF before reading n bytes, io.ErrUnexpectedEOF is returned.
|
|
func limitByteReader(r byteReader, n int64) *limitedByteReader {
|
|
return &limitedByteReader{limitedReader{r, n, io.ErrUnexpectedEOF}, r}
|
|
}
|
|
|
|
// fileChecksum allows file checksum validations to be performed.
|
|
// File contents must first be written to fileChecksum. Then valid is
|
|
// called to perform the file checksum calculation to determine
|
|
// if the file contents are valid or not.
|
|
type fileChecksum interface {
|
|
io.Writer
|
|
valid() bool
|
|
}
|
|
|
|
// FileHeader represents a single file in a RAR archive.
|
|
type FileHeader struct {
|
|
Name string // file name using '/' as the directory separator
|
|
IsDir bool // is a directory
|
|
HostOS byte // Host OS the archive was created on
|
|
Attributes int64 // Host OS specific file attributes
|
|
PackedSize int64 // packed file size (or first block if the file spans volumes)
|
|
UnPackedSize int64 // unpacked file size
|
|
UnKnownSize bool // unpacked file size is not known
|
|
ModificationTime time.Time // modification time (non-zero if set)
|
|
CreationTime time.Time // creation time (non-zero if set)
|
|
AccessTime time.Time // access time (non-zero if set)
|
|
Version int // file version
|
|
}
|
|
|
|
// Mode returns an os.FileMode for the file, calculated from the Attributes field.
|
|
func (f *FileHeader) Mode() os.FileMode {
|
|
var m os.FileMode
|
|
|
|
if f.IsDir {
|
|
m = os.ModeDir
|
|
}
|
|
if f.HostOS == HostOSWindows {
|
|
if f.IsDir {
|
|
m |= 0777
|
|
} else if f.Attributes&1 > 0 {
|
|
m |= 0444 // readonly
|
|
} else {
|
|
m |= 0666
|
|
}
|
|
return m
|
|
}
|
|
// assume unix perms for all remaining os types
|
|
m |= os.FileMode(f.Attributes) & os.ModePerm
|
|
|
|
// only check other bits on unix host created archives
|
|
if f.HostOS != HostOSUnix {
|
|
return m
|
|
}
|
|
|
|
if f.Attributes&0x200 != 0 {
|
|
m |= os.ModeSticky
|
|
}
|
|
if f.Attributes&0x400 != 0 {
|
|
m |= os.ModeSetgid
|
|
}
|
|
if f.Attributes&0x800 != 0 {
|
|
m |= os.ModeSetuid
|
|
}
|
|
|
|
// Check for additional file types.
|
|
if f.Attributes&0xF000 == 0xA000 {
|
|
m |= os.ModeSymlink
|
|
}
|
|
return m
|
|
}
|
|
|
|
// fileBlockHeader represents a file block in a RAR archive.
|
|
// Files may comprise one or more file blocks.
|
|
// Solid files retain decode tables and dictionary from previous solid files in the archive.
|
|
type fileBlockHeader struct {
|
|
first bool // first block in file
|
|
last bool // last block in file
|
|
solid bool // file is solid
|
|
winSize uint // log base 2 of decode window size
|
|
cksum fileChecksum // file checksum
|
|
decoder decoder // decoder to use for file
|
|
key []byte // key for AES, non-empty if file encrypted
|
|
iv []byte // iv for AES, non-empty if file encrypted
|
|
FileHeader
|
|
}
|
|
|
|
// fileBlockReader provides sequential access to file blocks in a RAR archive.
|
|
type fileBlockReader interface {
|
|
io.Reader // Read's read data from the current file block
|
|
io.ByteReader // Read bytes from current file block
|
|
next() (*fileBlockHeader, error) // reads the next file block header at current position
|
|
reset() // resets encryption
|
|
isSolid() bool // is archive solid
|
|
version() int // returns current archive format version
|
|
}
|
|
|
|
// packedFileReader provides sequential access to packed files in a RAR archive.
|
|
type packedFileReader struct {
|
|
r fileBlockReader
|
|
h *fileBlockHeader // current file header
|
|
}
|
|
|
|
// nextBlockInFile reads the next file block in the current file at the current
|
|
// archive file position, or returns an error if there is a problem.
|
|
// It is invalid to call this when already at the last block in the current file.
|
|
func (f *packedFileReader) nextBlockInFile() error {
|
|
h, err := f.r.next()
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
// archive ended, but file hasn't
|
|
return errUnexpectedArcEnd
|
|
}
|
|
return err
|
|
}
|
|
if h.first || h.Name != f.h.Name {
|
|
return errInvalidFileBlock
|
|
}
|
|
f.h = h
|
|
return nil
|
|
}
|
|
|
|
// next advances to the next packed file in the RAR archive.
|
|
func (f *packedFileReader) next() (*fileBlockHeader, error) {
|
|
if f.h != nil {
|
|
// skip to last block in current file
|
|
for !f.h.last {
|
|
// discard remaining block data
|
|
if _, err := io.Copy(ioutil.Discard, f.r); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := f.nextBlockInFile(); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
// discard last block data
|
|
if _, err := io.Copy(ioutil.Discard, f.r); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
var err error
|
|
f.h, err = f.r.next() // get next file block
|
|
if err != nil {
|
|
if err == errArchiveEnd {
|
|
return nil, io.EOF
|
|
}
|
|
return nil, err
|
|
}
|
|
if !f.h.first {
|
|
return nil, errInvalidFileBlock
|
|
}
|
|
return f.h, nil
|
|
}
|
|
|
|
// Read reads the packed data for the current file into p.
|
|
func (f *packedFileReader) Read(p []byte) (int, error) {
|
|
n, err := f.r.Read(p) // read current block data
|
|
for err == io.EOF { // current block empty
|
|
if n > 0 {
|
|
return n, nil
|
|
}
|
|
if f.h == nil || f.h.last {
|
|
return 0, io.EOF // last block so end of file
|
|
}
|
|
if err := f.nextBlockInFile(); err != nil {
|
|
return 0, err
|
|
}
|
|
n, err = f.r.Read(p) // read new block data
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (f *packedFileReader) ReadByte() (byte, error) {
|
|
c, err := f.r.ReadByte() // read current block data
|
|
for err == io.EOF && f.h != nil && !f.h.last { // current block empty
|
|
if err := f.nextBlockInFile(); err != nil {
|
|
return 0, err
|
|
}
|
|
c, err = f.r.ReadByte() // read new block data
|
|
}
|
|
return c, err
|
|
}
|
|
|
|
// Reader provides sequential access to files in a RAR archive.
|
|
type Reader struct {
|
|
r io.Reader // reader for current unpacked file
|
|
pr packedFileReader // reader for current packed file
|
|
dr decodeReader // reader for decoding and filters if file is compressed
|
|
cksum fileChecksum // current file checksum
|
|
solidr io.Reader // reader for solid file
|
|
}
|
|
|
|
// Read reads from the current file in the RAR archive.
|
|
func (r *Reader) Read(p []byte) (int, error) {
|
|
n, err := r.r.Read(p)
|
|
if err == io.EOF && r.cksum != nil && !r.cksum.valid() {
|
|
return n, errBadFileChecksum
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
// Next advances to the next file in the archive.
|
|
func (r *Reader) Next() (*FileHeader, error) {
|
|
if r.solidr != nil {
|
|
// solid files must be read fully to update decoder information
|
|
if _, err := io.Copy(ioutil.Discard, r.solidr); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
h, err := r.pr.next() // skip to next file
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
r.solidr = nil
|
|
|
|
br := byteReader(&r.pr) // start with packed file reader
|
|
|
|
// check for encryption
|
|
if len(h.key) > 0 && len(h.iv) > 0 {
|
|
br = newAesDecryptReader(br, h.key, h.iv) // decrypt
|
|
}
|
|
r.r = br
|
|
// check for compression
|
|
if h.decoder != nil {
|
|
err = r.dr.init(br, h.decoder, h.winSize, !h.solid)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
r.r = &r.dr
|
|
if r.pr.r.isSolid() {
|
|
r.solidr = r.r
|
|
}
|
|
}
|
|
if h.UnPackedSize >= 0 && !h.UnKnownSize {
|
|
// Limit reading to UnPackedSize as there may be padding
|
|
r.r = &limitedReader{r.r, h.UnPackedSize, errShortFile}
|
|
}
|
|
r.cksum = h.cksum
|
|
if r.cksum != nil {
|
|
r.r = io.TeeReader(r.r, h.cksum) // write file data to checksum as it is read
|
|
}
|
|
fh := new(FileHeader)
|
|
*fh = h.FileHeader
|
|
return fh, nil
|
|
}
|
|
|
|
func (r *Reader) init(fbr fileBlockReader) {
|
|
r.r = bytes.NewReader(nil) // initial reads will always return EOF
|
|
r.pr.r = fbr
|
|
}
|
|
|
|
// NewReader creates a Reader reading from r.
|
|
// NewReader only supports single volume archives.
|
|
// Multi-volume archives must use OpenReader.
|
|
func NewReader(r io.Reader, password string) (*Reader, error) {
|
|
br, ok := r.(*bufio.Reader)
|
|
if !ok {
|
|
br = bufio.NewReader(r)
|
|
}
|
|
fbr, err := newFileBlockReader(br, password)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
rr := new(Reader)
|
|
rr.init(fbr)
|
|
return rr, nil
|
|
}
|
|
|
|
type ReadCloser struct {
|
|
v *volume
|
|
Reader
|
|
}
|
|
|
|
// Close closes the rar file.
|
|
func (rc *ReadCloser) Close() error {
|
|
return rc.v.Close()
|
|
}
|
|
|
|
// Volumes returns the volume filenames that have been used in decoding the archive
|
|
// up to this point. This will include the current open volume if the archive is still
|
|
// being processed.
|
|
func (rc *ReadCloser) Volumes() []string {
|
|
return rc.v.files
|
|
}
|
|
|
|
// OpenReader opens a RAR archive specified by the name and returns a ReadCloser.
|
|
func OpenReader(name, password string) (*ReadCloser, error) {
|
|
v, err := openVolume(name, password)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
rc := new(ReadCloser)
|
|
rc.v = v
|
|
rc.Reader.init(v)
|
|
return rc, nil
|
|
}
|