Bump github.com/SevereCloud/vksdk/v2 from 2.11.0 to 2.13.0 (#1698)

Bumps [github.com/SevereCloud/vksdk/v2](https://github.com/SevereCloud/vksdk) from 2.11.0 to 2.13.0.
- [Release notes](https://github.com/SevereCloud/vksdk/releases)
- [Commits](https://github.com/SevereCloud/vksdk/compare/v2.11.0...v2.13.0)

---
updated-dependencies:
- dependency-name: github.com/SevereCloud/vksdk/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

1 files changed, 213 insertions, 16 deletions

diff --git a/vendor/github.com/klauspost/compress/s2/decode.go b/vendor/github.com/klauspost/compress/s2/decode.go
index d0ae5304..9e7fce88 100644
--- a/vendor/github.com/klauspost/compress/s2/decode.go
+++ b/vendor/github.com/klauspost/compress/s2/decode.go
@@ -8,7 +8,9 @@ package s2
 import (
 	"encoding/binary"
 	"errors"
+	"fmt"
 	"io"
+	"io/ioutil"
 )
 
 var (
@@ -22,6 +24,16 @@ var (
 	ErrUnsupported = errors.New("s2: unsupported input")
 )
 
+// ErrCantSeek is returned if the stream cannot be seeked.
+type ErrCantSeek struct {
+	Reason string
+}
+
+// Error returns the error as string.
+func (e ErrCantSeek) Error() string {
+	return fmt.Sprintf("s2: Can't seek because %s", e.Reason)
+}
+
 // DecodedLen returns the length of the decoded block.
 func DecodedLen(src []byte) (int, error) {
 	v, _, err := decodedLen(src)
@@ -88,6 +100,7 @@ func NewReader(r io.Reader, opts ...ReaderOption) *Reader {
 	} else {
 		nr.buf = make([]byte, MaxEncodedLen(defaultBlockSize)+checksumSize)
 	}
+	nr.readHeader = nr.ignoreStreamID
 	nr.paramsOK = true
 	return &nr
 }
@@ -131,12 +144,41 @@ func ReaderAllocBlock(blockSize int) ReaderOption {
 	}
 }
 
+// ReaderIgnoreStreamIdentifier will make the reader skip the expected
+// stream identifier at the beginning of the stream.
+// This can be used when serving a stream that has been forwarded to a specific point.
+func ReaderIgnoreStreamIdentifier() ReaderOption {
+	return func(r *Reader) error {
+		r.ignoreStreamID = true
+		return nil
+	}
+}
+
+// ReaderSkippableCB will register a callback for chuncks with the specified ID.
+// ID must be a Reserved skippable chunks ID, 0x80-0xfd (inclusive).
+// For each chunk with the ID, the callback is called with the content.
+// Any returned non-nil error will abort decompression.
+// Only one callback per ID is supported, latest sent will be used.
+func ReaderSkippableCB(id uint8, fn func(r io.Reader) error) ReaderOption {
+	return func(r *Reader) error {
+		if id < 0x80 || id > 0xfd {
+			return fmt.Errorf("ReaderSkippableCB: Invalid id provided, must be 0x80-0xfd (inclusive)")
+		}
+		r.skippableCB[id] = fn
+		return nil
+	}
+}
+
 // Reader is an io.Reader that can read Snappy-compressed bytes.
 type Reader struct {
-	r       io.Reader
-	err     error
-	decoded []byte
-	buf     []byte
+	r           io.Reader
+	err         error
+	decoded     []byte
+	buf         []byte
+	skippableCB [0x80]func(r io.Reader) error
+	blockStart  int64 // Uncompressed offset at start of current.
+	index       *Index
+
 	// decoded[i:j] contains decoded bytes that have not yet been passed on.
 	i, j int
 	// maximum block size allowed.
@@ -144,10 +186,11 @@ type Reader struct {
 	// maximum expected buffer size.
 	maxBufSize int
 	// alloc a buffer this size if > 0.
-	lazyBuf     int
-	readHeader  bool
-	paramsOK    bool
-	snappyFrame bool
+	lazyBuf        int
+	readHeader     bool
+	paramsOK       bool
+	snappyFrame    bool
+	ignoreStreamID bool
 }
 
 // ensureBufferSize will ensure that the buffer can take at least n bytes.
@@ -172,11 +215,12 @@ func (r *Reader) Reset(reader io.Reader) {
 	if !r.paramsOK {
 		return
 	}
+	r.index = nil
 	r.r = reader
 	r.err = nil
 	r.i = 0
 	r.j = 0
-	r.readHeader = false
+	r.readHeader = r.ignoreStreamID
 }
 
 func (r *Reader) readFull(p []byte, allowEOF bool) (ok bool) {
@@ -189,11 +233,24 @@ func (r *Reader) readFull(p []byte, allowEOF bool) (ok bool) {
 	return true
 }
 
-// skipN will skip n bytes.
+// skippable will skip n bytes.
 // If the supplied reader supports seeking that is used.
 // tmp is used as a temporary buffer for reading.
 // The supplied slice does not need to be the size of the read.
-func (r *Reader) skipN(tmp []byte, n int, allowEOF bool) (ok bool) {
+func (r *Reader) skippable(tmp []byte, n int, allowEOF bool, id uint8) (ok bool) {
+	if id < 0x80 {
+		r.err = fmt.Errorf("interbal error: skippable id < 0x80")
+		return false
+	}
+	if fn := r.skippableCB[id-0x80]; fn != nil {
+		rd := io.LimitReader(r.r, int64(n))
+		r.err = fn(rd)
+		if r.err != nil {
+			return false
+		}
+		_, r.err = io.CopyBuffer(ioutil.Discard, rd, tmp)
+		return r.err == nil
+	}
 	if rs, ok := r.r.(io.ReadSeeker); ok {
 		_, err := rs.Seek(int64(n), io.SeekCurrent)
 		if err == nil {
@@ -247,6 +304,7 @@ func (r *Reader) Read(p []byte) (int, error) {
 		// https://github.com/google/snappy/blob/master/framing_format.txt
 		switch chunkType {
 		case chunkTypeCompressedData:
+			r.blockStart += int64(r.j)
 			// Section 4.2. Compressed data (chunk type 0x00).
 			if chunkLen < checksumSize {
 				r.err = ErrCorrupt
@@ -294,6 +352,7 @@ func (r *Reader) Read(p []byte) (int, error) {
 			continue
 
 		case chunkTypeUncompressedData:
+			r.blockStart += int64(r.j)
 			// Section 4.3. Uncompressed data (chunk type 0x01).
 			if chunkLen < checksumSize {
 				r.err = ErrCorrupt
@@ -357,17 +416,20 @@ func (r *Reader) Read(p []byte) (int, error) {
 
 		if chunkType <= 0x7f {
 			// Section 4.5. Reserved unskippable chunks (chunk types 0x02-0x7f).
+			// fmt.Printf("ERR chunktype: 0x%x\n", chunkType)
 			r.err = ErrUnsupported
 			return 0, r.err
 		}
 		// Section 4.4 Padding (chunk type 0xfe).
 		// Section 4.6. Reserved skippable chunks (chunk types 0x80-0xfd).
-		if chunkLen > maxBlockSize {
+		if chunkLen > maxChunkSize {
+			// fmt.Printf("ERR chunkLen: 0x%x\n", chunkLen)
 			r.err = ErrUnsupported
 			return 0, r.err
 		}
 
-		if !r.skipN(r.buf, chunkLen, false) {
+		// fmt.Printf("skippable: ID: 0x%x, len: 0x%x\n", chunkType, chunkLen)
+		if !r.skippable(r.buf, chunkLen, false, chunkType) {
 			return 0, r.err
 		}
 	}
@@ -396,7 +458,7 @@ func (r *Reader) Skip(n int64) error {
 				return nil
 			}
 			n -= int64(r.j - r.i)
-			r.i, r.j = 0, 0
+			r.i = r.j
 		}
 
 		// Buffer empty; read blocks until we have content.
@@ -420,6 +482,7 @@ func (r *Reader) Skip(n int64) error {
 		// https://github.com/google/snappy/blob/master/framing_format.txt
 		switch chunkType {
 		case chunkTypeCompressedData:
+			r.blockStart += int64(r.j)
 			// Section 4.2. Compressed data (chunk type 0x00).
 			if chunkLen < checksumSize {
 				r.err = ErrCorrupt
@@ -468,6 +531,7 @@ func (r *Reader) Skip(n int64) error {
 			r.i, r.j = 0, dLen
 			continue
 		case chunkTypeUncompressedData:
+			r.blockStart += int64(r.j)
 			// Section 4.3. Uncompressed data (chunk type 0x01).
 			if chunkLen < checksumSize {
 				r.err = ErrCorrupt
@@ -528,19 +592,138 @@ func (r *Reader) Skip(n int64) error {
 			r.err = ErrUnsupported
 			return r.err
 		}
-		if chunkLen > maxBlockSize {
+		if chunkLen > maxChunkSize {
 			r.err = ErrUnsupported
 			return r.err
 		}
 		// Section 4.4 Padding (chunk type 0xfe).
 		// Section 4.6. Reserved skippable chunks (chunk types 0x80-0xfd).
-		if !r.skipN(r.buf, chunkLen, false) {
+		if !r.skippable(r.buf, chunkLen, false, chunkType) {
 			return r.err
 		}
 	}
 	return nil
 }
 
+// ReadSeeker provides random or forward seeking in compressed content.
+// See Reader.ReadSeeker
+type ReadSeeker struct {
+	*Reader
+}
+
+// ReadSeeker will return an io.ReadSeeker compatible version of the reader.
+// If 'random' is specified the returned io.Seeker can be used for
+// random seeking, otherwise only forward seeking is supported.
+// Enabling random seeking requires the original input to support
+// the io.Seeker interface.
+// A custom index can be specified which will be used if supplied.
+// When using a custom index, it will not be read from the input stream.
+// The returned ReadSeeker contains a shallow reference to the existing Reader,
+// meaning changes performed to one is reflected in the other.
+func (r *Reader) ReadSeeker(random bool, index []byte) (*ReadSeeker, error) {
+	// Read index if provided.
+	if len(index) != 0 {
+		if r.index == nil {
+			r.index = &Index{}
+		}
+		if _, err := r.index.Load(index); err != nil {
+			return nil, ErrCantSeek{Reason: "loading index returned: " + err.Error()}
+		}
+	}
+
+	// Check if input is seekable
+	rs, ok := r.r.(io.ReadSeeker)
+	if !ok {
+		if !random {
+			return &ReadSeeker{Reader: r}, nil
+		}
+		return nil, ErrCantSeek{Reason: "input stream isn't seekable"}
+	}
+
+	if r.index != nil {
+		// Seekable and index, ok...
+		return &ReadSeeker{Reader: r}, nil
+	}
+
+	// Load from stream.
+	r.index = &Index{}
+
+	// Read current position.
+	pos, err := rs.Seek(0, io.SeekCurrent)
+	if err != nil {
+		return nil, ErrCantSeek{Reason: "seeking input returned: " + err.Error()}
+	}
+	err = r.index.LoadStream(rs)
+	if err != nil {
+		if err == ErrUnsupported {
+			return nil, ErrCantSeek{Reason: "input stream does not contain an index"}
+		}
+		return nil, ErrCantSeek{Reason: "reading index returned: " + err.Error()}
+	}
+
+	// reset position.
+	_, err = rs.Seek(pos, io.SeekStart)
+	if err != nil {
+		return nil, ErrCantSeek{Reason: "seeking input returned: " + err.Error()}
+	}
+	return &ReadSeeker{Reader: r}, nil
+}
+
+// Seek allows seeking in compressed data.
+func (r *ReadSeeker) Seek(offset int64, whence int) (int64, error) {
+	if r.err != nil {
+		return 0, r.err
+	}
+	if offset == 0 && whence == io.SeekCurrent {
+		return r.blockStart + int64(r.i), nil
+	}
+	if !r.readHeader {
+		// Make sure we read the header.
+		_, r.err = r.Read([]byte{})
+	}
+	rs, ok := r.r.(io.ReadSeeker)
+	if r.index == nil || !ok {
+		if whence == io.SeekCurrent && offset >= 0 {
+			err := r.Skip(offset)
+			return r.blockStart + int64(r.i), err
+		}
+		if whence == io.SeekStart && offset >= r.blockStart+int64(r.i) {
+			err := r.Skip(offset - r.blockStart - int64(r.i))
+			return r.blockStart + int64(r.i), err
+		}
+		return 0, ErrUnsupported
+
+	}
+
+	switch whence {
+	case io.SeekCurrent:
+		offset += r.blockStart + int64(r.i)
+	case io.SeekEnd:
+		offset = -offset
+	}
+	c, u, err := r.index.Find(offset)
+	if err != nil {
+		return r.blockStart + int64(r.i), err
+	}
+
+	// Seek to next block
+	_, err = rs.Seek(c, io.SeekStart)
+	if err != nil {
+		return 0, err
+	}
+
+	if offset < 0 {
+		offset = r.index.TotalUncompressed + offset
+	}
+
+	r.i = r.j // Remove rest of current block.
+	if u < offset {
+		// Forward inside block
+		return offset, r.Skip(offset - u)
+	}
+	return offset, nil
+}
+
 // ReadByte satisfies the io.ByteReader interface.
 func (r *Reader) ReadByte() (byte, error) {
 	if r.err != nil {
@@ -563,3 +746,17 @@ func (r *Reader) ReadByte() (byte, error) {
 	}
 	return 0, io.ErrNoProgress
 }
+
+// SkippableCB will register a callback for chunks with the specified ID.
+// ID must be a Reserved skippable chunks ID, 0x80-0xfe (inclusive).
+// For each chunk with the ID, the callback is called with the content.
+// Any returned non-nil error will abort decompression.
+// Only one callback per ID is supported, latest sent will be used.
+// Sending a nil function will disable previous callbacks.
+func (r *Reader) SkippableCB(id uint8, fn func(r io.Reader) error) error {
+	if id < 0x80 || id > chunkTypePadding {
+		return fmt.Errorf("ReaderSkippableCB: Invalid id provided, must be 0x80-0xfe (inclusive)")
+	}
+	r.skippableCB[id] = fn
+	return nil
+}