mirror of
https://github.com/superseriousbusiness/gotosocial
synced 2025-06-05 21:59:39 +02:00
bump go-store version (includes minio) (#1657)
Signed-off-by: kim <grufwub@gmail.com>
This commit is contained in:
kim
GitHub
491
vendor/github.com/klauspost/compress/s2/decode.go
generated
vendored
491
vendor/github.com/klauspost/compress/s2/decode.go
generated
vendored
@ -13,6 +13,7 @@ import (
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"io/ioutil"
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"math"
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"runtime"
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"strconv"
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"sync"
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)
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@ -880,15 +881,20 @@ func (r *Reader) Skip(n int64) error {
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// See Reader.ReadSeeker
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type ReadSeeker struct {
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*Reader
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readAtMu sync.Mutex
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}
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// ReadSeeker will return an io.ReadSeeker compatible version of the reader.
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// ReadSeeker will return an io.ReadSeeker and io.ReaderAt
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// compatible version of the reader.
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// If 'random' is specified the returned io.Seeker can be used for
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// random seeking, otherwise only forward seeking is supported.
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// Enabling random seeking requires the original input to support
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// the io.Seeker interface.
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// A custom index can be specified which will be used if supplied.
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// When using a custom index, it will not be read from the input stream.
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// The ReadAt position will affect regular reads and the current position of Seek.
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// So using Read after ReadAt will continue from where the ReadAt stopped.
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// No functions should be used concurrently.
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// The returned ReadSeeker contains a shallow reference to the existing Reader,
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// meaning changes performed to one is reflected in the other.
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func (r *Reader) ReadSeeker(random bool, index []byte) (*ReadSeeker, error) {
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@ -958,42 +964,55 @@ func (r *ReadSeeker) Seek(offset int64, whence int) (int64, error) {
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// Reset on EOF
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r.err = nil
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}
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if offset == 0 && whence == io.SeekCurrent {
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return r.blockStart + int64(r.i), nil
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}
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if !r.readHeader {
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// Make sure we read the header.
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_, r.err = r.Read([]byte{})
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}
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rs, ok := r.r.(io.ReadSeeker)
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if r.index == nil || !ok {
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if whence == io.SeekCurrent && offset >= 0 {
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err := r.Skip(offset)
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return r.blockStart + int64(r.i), err
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}
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if whence == io.SeekStart && offset >= r.blockStart+int64(r.i) {
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err := r.Skip(offset - r.blockStart - int64(r.i))
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return r.blockStart + int64(r.i), err
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}
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return 0, ErrUnsupported
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}
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// Calculate absolute offset.
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absOffset := offset
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switch whence {
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case io.SeekStart:
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case io.SeekCurrent:
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offset += r.blockStart + int64(r.i)
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absOffset = r.blockStart + int64(r.i) + offset
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case io.SeekEnd:
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if offset > 0 {
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return 0, errors.New("seek after end of file")
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if r.index == nil {
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return 0, ErrUnsupported
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}
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offset = r.index.TotalUncompressed + offset
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absOffset = r.index.TotalUncompressed + offset
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default:
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r.err = ErrUnsupported
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return 0, r.err
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}
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if offset < 0 {
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if absOffset < 0 {
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return 0, errors.New("seek before start of file")
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}
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c, u, err := r.index.Find(offset)
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if !r.readHeader {
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// Make sure we read the header.
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_, r.err = r.Read([]byte{})
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if r.err != nil {
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return 0, r.err
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}
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}
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// If we are inside current block no need to seek.
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// This includes no offset changes.
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if absOffset >= r.blockStart && absOffset < r.blockStart+int64(r.j) {
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r.i = int(absOffset - r.blockStart)
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return r.blockStart + int64(r.i), nil
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}
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rs, ok := r.r.(io.ReadSeeker)
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if r.index == nil || !ok {
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currOffset := r.blockStart + int64(r.i)
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if absOffset >= currOffset {
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err := r.Skip(absOffset - currOffset)
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return r.blockStart + int64(r.i), err
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}
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return 0, ErrUnsupported
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}
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// We can seek and we have an index.
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c, u, err := r.index.Find(absOffset)
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if err != nil {
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return r.blockStart + int64(r.i), err
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}
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@ -1004,12 +1023,57 @@ func (r *ReadSeeker) Seek(offset int64, whence int) (int64, error) {
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return 0, err
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}
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r.i = r.j // Remove rest of current block.
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if u < offset {
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r.i = r.j // Remove rest of current block.
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r.blockStart = u - int64(r.j) // Adjust current block start for accounting.
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if u < absOffset {
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// Forward inside block
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return offset, r.Skip(offset - u)
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return absOffset, r.Skip(absOffset - u)
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}
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return offset, nil
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if u > absOffset {
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return 0, fmt.Errorf("s2 seek: (internal error) u (%d) > absOffset (%d)", u, absOffset)
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}
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return absOffset, nil
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}
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// ReadAt reads len(p) bytes into p starting at offset off in the
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// underlying input source. It returns the number of bytes
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// read (0 <= n <= len(p)) and any error encountered.
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//
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// When ReadAt returns n < len(p), it returns a non-nil error
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// explaining why more bytes were not returned. In this respect,
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// ReadAt is stricter than Read.
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//
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// Even if ReadAt returns n < len(p), it may use all of p as scratch
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// space during the call. If some data is available but not len(p) bytes,
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// ReadAt blocks until either all the data is available or an error occurs.
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// In this respect ReadAt is different from Read.
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//
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// If the n = len(p) bytes returned by ReadAt are at the end of the
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// input source, ReadAt may return either err == EOF or err == nil.
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//
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// If ReadAt is reading from an input source with a seek offset,
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// ReadAt should not affect nor be affected by the underlying
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// seek offset.
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//
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// Clients of ReadAt can execute parallel ReadAt calls on the
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// same input source. This is however not recommended.
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func (r *ReadSeeker) ReadAt(p []byte, offset int64) (int, error) {
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r.readAtMu.Lock()
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defer r.readAtMu.Unlock()
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_, err := r.Seek(offset, io.SeekStart)
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if err != nil {
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return 0, err
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}
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n := 0
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for n < len(p) {
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n2, err := r.Read(p[n:])
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if err != nil {
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// This will include io.EOF
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return n + n2, err
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}
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n += n2
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}
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return n, nil
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}
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// ReadByte satisfies the io.ByteReader interface.
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@ -1048,3 +1112,370 @@ func (r *Reader) SkippableCB(id uint8, fn func(r io.Reader) error) error {
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r.skippableCB[id] = fn
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return nil
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}
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// s2DecodeDict writes the decoding of src to dst. It assumes that the varint-encoded
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// length of the decompressed bytes has already been read, and that len(dst)
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// equals that length.
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//
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// It returns 0 on success or a decodeErrCodeXxx error code on failure.
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func s2DecodeDict(dst, src []byte, dict *Dict) int {
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if dict == nil {
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return s2Decode(dst, src)
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}
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const debug = false
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const debugErrs = debug
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if debug {
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fmt.Println("Starting decode, dst len:", len(dst))
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}
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var d, s, length int
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offset := len(dict.dict) - dict.repeat
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// As long as we can read at least 5 bytes...
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for s < len(src)-5 {
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// Removing bounds checks is SLOWER, when if doing
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// in := src[s:s+5]
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// Checked on Go 1.18
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switch src[s] & 0x03 {
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case tagLiteral:
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x := uint32(src[s] >> 2)
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switch {
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case x < 60:
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s++
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case x == 60:
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s += 2
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x = uint32(src[s-1])
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case x == 61:
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in := src[s : s+3]
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x = uint32(in[1]) | uint32(in[2])<<8
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s += 3
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case x == 62:
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in := src[s : s+4]
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// Load as 32 bit and shift down.
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x = uint32(in[0]) | uint32(in[1])<<8 | uint32(in[2])<<16 | uint32(in[3])<<24
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x >>= 8
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s += 4
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case x == 63:
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in := src[s : s+5]
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x = uint32(in[1]) | uint32(in[2])<<8 | uint32(in[3])<<16 | uint32(in[4])<<24
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s += 5
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}
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length = int(x) + 1
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if debug {
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fmt.Println("literals, length:", length, "d-after:", d+length)
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}
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if length > len(dst)-d || length > len(src)-s || (strconv.IntSize == 32 && length <= 0) {
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if debugErrs {
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fmt.Println("corrupt literal: length:", length, "d-left:", len(dst)-d, "src-left:", len(src)-s)
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}
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return decodeErrCodeCorrupt
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}
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copy(dst[d:], src[s:s+length])
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d += length
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s += length
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continue
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case tagCopy1:
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s += 2
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toffset := int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
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length = int(src[s-2]) >> 2 & 0x7
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if toffset == 0 {
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if debug {
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fmt.Print("(repeat) ")
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}
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// keep last offset
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switch length {
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case 5:
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length = int(src[s]) + 4
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s += 1
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case 6:
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in := src[s : s+2]
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length = int(uint32(in[0])|(uint32(in[1])<<8)) + (1 << 8)
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s += 2
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case 7:
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in := src[s : s+3]
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length = int((uint32(in[2])<<16)|(uint32(in[1])<<8)|uint32(in[0])) + (1 << 16)
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s += 3
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default: // 0-> 4
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}
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} else {
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offset = toffset
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}
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length += 4
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case tagCopy2:
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in := src[s : s+3]
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offset = int(uint32(in[1]) | uint32(in[2])<<8)
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length = 1 + int(in[0])>>2
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s += 3
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case tagCopy4:
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in := src[s : s+5]
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offset = int(uint32(in[1]) | uint32(in[2])<<8 | uint32(in[3])<<16 | uint32(in[4])<<24)
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length = 1 + int(in[0])>>2
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s += 5
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}
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if offset <= 0 || length > len(dst)-d {
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if debugErrs {
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fmt.Println("match error; offset:", offset, "length:", length, "dst-left:", len(dst)-d)
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}
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return decodeErrCodeCorrupt
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}
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// copy from dict
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if d < offset {
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if d > MaxDictSrcOffset {
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if debugErrs {
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fmt.Println("dict after", MaxDictSrcOffset, "d:", d, "offset:", offset, "length:", length)
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}
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return decodeErrCodeCorrupt
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}
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startOff := len(dict.dict) - offset + d
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if startOff < 0 || startOff+length > len(dict.dict) {
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if debugErrs {
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fmt.Printf("offset (%d) + length (%d) bigger than dict (%d)\n", offset, length, len(dict.dict))
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}
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return decodeErrCodeCorrupt
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}
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if debug {
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fmt.Println("dict copy, length:", length, "offset:", offset, "d-after:", d+length, "dict start offset:", startOff)
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}
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copy(dst[d:d+length], dict.dict[startOff:])
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d += length
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continue
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}
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|
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if debug {
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fmt.Println("copy, length:", length, "offset:", offset, "d-after:", d+length)
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}
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|
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// Copy from an earlier sub-slice of dst to a later sub-slice.
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// If no overlap, use the built-in copy:
|
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if offset > length {
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copy(dst[d:d+length], dst[d-offset:])
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d += length
|
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continue
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}
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|
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// Unlike the built-in copy function, this byte-by-byte copy always runs
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// forwards, even if the slices overlap. Conceptually, this is:
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//
|
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// d += forwardCopy(dst[d:d+length], dst[d-offset:])
|
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//
|
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// We align the slices into a and b and show the compiler they are the same size.
|
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// This allows the loop to run without bounds checks.
|
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a := dst[d : d+length]
|
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b := dst[d-offset:]
|
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b = b[:len(a)]
|
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for i := range a {
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a[i] = b[i]
|
||||
}
|
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d += length
|
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}
|
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|
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// Remaining with extra checks...
|
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for s < len(src) {
|
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switch src[s] & 0x03 {
|
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case tagLiteral:
|
||||
x := uint32(src[s] >> 2)
|
||||
switch {
|
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case x < 60:
|
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s++
|
||||
case x == 60:
|
||||
s += 2
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
x = uint32(src[s-1])
|
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case x == 61:
|
||||
s += 3
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
x = uint32(src[s-2]) | uint32(src[s-1])<<8
|
||||
case x == 62:
|
||||
s += 4
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
|
||||
case x == 63:
|
||||
s += 5
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
|
||||
}
|
||||
length = int(x) + 1
|
||||
if length > len(dst)-d || length > len(src)-s || (strconv.IntSize == 32 && length <= 0) {
|
||||
if debugErrs {
|
||||
fmt.Println("corrupt literal: length:", length, "d-left:", len(dst)-d, "src-left:", len(src)-s)
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
if debug {
|
||||
fmt.Println("literals, length:", length, "d-after:", d+length)
|
||||
}
|
||||
|
||||
copy(dst[d:], src[s:s+length])
|
||||
d += length
|
||||
s += length
|
||||
continue
|
||||
|
||||
case tagCopy1:
|
||||
s += 2
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
length = int(src[s-2]) >> 2 & 0x7
|
||||
toffset := int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
|
||||
if toffset == 0 {
|
||||
if debug {
|
||||
fmt.Print("(repeat) ")
|
||||
}
|
||||
// keep last offset
|
||||
switch length {
|
||||
case 5:
|
||||
s += 1
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
length = int(uint32(src[s-1])) + 4
|
||||
case 6:
|
||||
s += 2
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
length = int(uint32(src[s-2])|(uint32(src[s-1])<<8)) + (1 << 8)
|
||||
case 7:
|
||||
s += 3
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
length = int(uint32(src[s-3])|(uint32(src[s-2])<<8)|(uint32(src[s-1])<<16)) + (1 << 16)
|
||||
default: // 0-> 4
|
||||
}
|
||||
} else {
|
||||
offset = toffset
|
||||
}
|
||||
length += 4
|
||||
case tagCopy2:
|
||||
s += 3
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
length = 1 + int(src[s-3])>>2
|
||||
offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
|
||||
|
||||
case tagCopy4:
|
||||
s += 5
|
||||
if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
|
||||
if debugErrs {
|
||||
fmt.Println("src went oob")
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
length = 1 + int(src[s-5])>>2
|
||||
offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
|
||||
}
|
||||
|
||||
if offset <= 0 || length > len(dst)-d {
|
||||
if debugErrs {
|
||||
fmt.Println("match error; offset:", offset, "length:", length, "dst-left:", len(dst)-d)
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
|
||||
// copy from dict
|
||||
if d < offset {
|
||||
if d > MaxDictSrcOffset {
|
||||
if debugErrs {
|
||||
fmt.Println("dict after", MaxDictSrcOffset, "d:", d, "offset:", offset, "length:", length)
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
rOff := len(dict.dict) - (offset - d)
|
||||
if debug {
|
||||
fmt.Println("starting dict entry from dict offset", len(dict.dict)-rOff)
|
||||
}
|
||||
if rOff+length > len(dict.dict) {
|
||||
if debugErrs {
|
||||
fmt.Println("err: END offset", rOff+length, "bigger than dict", len(dict.dict), "dict offset:", rOff, "length:", length)
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
if rOff < 0 {
|
||||
if debugErrs {
|
||||
fmt.Println("err: START offset", rOff, "less than 0", len(dict.dict), "dict offset:", rOff, "length:", length)
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
copy(dst[d:d+length], dict.dict[rOff:])
|
||||
d += length
|
||||
continue
|
||||
}
|
||||
|
||||
if debug {
|
||||
fmt.Println("copy, length:", length, "offset:", offset, "d-after:", d+length)
|
||||
}
|
||||
|
||||
// Copy from an earlier sub-slice of dst to a later sub-slice.
|
||||
// If no overlap, use the built-in copy:
|
||||
if offset > length {
|
||||
copy(dst[d:d+length], dst[d-offset:])
|
||||
d += length
|
||||
continue
|
||||
}
|
||||
|
||||
// Unlike the built-in copy function, this byte-by-byte copy always runs
|
||||
// forwards, even if the slices overlap. Conceptually, this is:
|
||||
//
|
||||
// d += forwardCopy(dst[d:d+length], dst[d-offset:])
|
||||
//
|
||||
// We align the slices into a and b and show the compiler they are the same size.
|
||||
// This allows the loop to run without bounds checks.
|
||||
a := dst[d : d+length]
|
||||
b := dst[d-offset:]
|
||||
b = b[:len(a)]
|
||||
for i := range a {
|
||||
a[i] = b[i]
|
||||
}
|
||||
d += length
|
||||
}
|
||||
|
||||
if d != len(dst) {
|
||||
if debugErrs {
|
||||
fmt.Println("wanted length", len(dst), "got", d)
|
||||
}
|
||||
return decodeErrCodeCorrupt
|
||||
}
|
||||
return 0
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user