1 files changed, 0 insertions, 261 deletions
diff --git a/vendor/github.com/klauspost/compress/zstd/decodeheader.go b/vendor/github.com/klauspost/compress/zstd/decodeheader.go
deleted file mode 100644
index 6a5a2988b..000000000
--- a/vendor/github.com/klauspost/compress/zstd/decodeheader.go
+++ /dev/null
@@ -1,261 +0,0 @@
-// Copyright 2020+ Klaus Post. All rights reserved.
-// License information can be found in the LICENSE file.
-
-package zstd
-
-import (
-	"encoding/binary"
-	"errors"
-	"io"
-)
-
-// HeaderMaxSize is the maximum size of a Frame and Block Header.
-// If less is sent to Header.Decode it *may* still contain enough information.
-const HeaderMaxSize = 14 + 3
-
-// Header contains information about the first frame and block within that.
-type Header struct {
-	// SingleSegment specifies whether the data is to be decompressed into a
-	// single contiguous memory segment.
-	// It implies that WindowSize is invalid and that FrameContentSize is valid.
-	SingleSegment bool
-
-	// WindowSize is the window of data to keep while decoding.
-	// Will only be set if SingleSegment is false.
-	WindowSize uint64
-
-	// Dictionary ID.
-	// If 0, no dictionary.
-	DictionaryID uint32
-
-	// HasFCS specifies whether FrameContentSize has a valid value.
-	HasFCS bool
-
-	// FrameContentSize is the expected uncompressed size of the entire frame.
-	FrameContentSize uint64
-
-	// Skippable will be true if the frame is meant to be skipped.
-	// This implies that FirstBlock.OK is false.
-	Skippable bool
-
-	// SkippableID is the user-specific ID for the skippable frame.
-	// Valid values are between 0 to 15, inclusive.
-	SkippableID int
-
-	// SkippableSize is the length of the user data to skip following
-	// the header.
-	SkippableSize uint32
-
-	// HeaderSize is the raw size of the frame header.
-	//
-	// For normal frames, it includes the size of the magic number and
-	// the size of the header (per section 3.1.1.1).
-	// It does not include the size for any data blocks (section 3.1.1.2) nor
-	// the size for the trailing content checksum.
-	//
-	// For skippable frames, this counts the size of the magic number
-	// along with the size of the size field of the payload.
-	// It does not include the size of the skippable payload itself.
-	// The total frame size is the HeaderSize plus the SkippableSize.
-	HeaderSize int
-
-	// First block information.
-	FirstBlock struct {
-		// OK will be set if first block could be decoded.
-		OK bool
-
-		// Is this the last block of a frame?
-		Last bool
-
-		// Is the data compressed?
-		// If true CompressedSize will be populated.
-		// Unfortunately DecompressedSize cannot be determined
-		// without decoding the blocks.
-		Compressed bool
-
-		// DecompressedSize is the expected decompressed size of the block.
-		// Will be 0 if it cannot be determined.
-		DecompressedSize int
-
-		// CompressedSize of the data in the block.
-		// Does not include the block header.
-		// Will be equal to DecompressedSize if not Compressed.
-		CompressedSize int
-	}
-
-	// If set there is a checksum present for the block content.
-	// The checksum field at the end is always 4 bytes long.
-	HasCheckSum bool
-}
-
-// Decode the header from the beginning of the stream.
-// This will decode the frame header and the first block header if enough bytes are provided.
-// It is recommended to provide at least HeaderMaxSize bytes.
-// If the frame header cannot be read an error will be returned.
-// If there isn't enough input, io.ErrUnexpectedEOF is returned.
-// The FirstBlock.OK will indicate if enough information was available to decode the first block header.
-func (h *Header) Decode(in []byte) error {
-	_, err := h.DecodeAndStrip(in)
-	return err
-}
-
-// DecodeAndStrip will decode the header from the beginning of the stream
-// and on success return the remaining bytes.
-// This will decode the frame header and the first block header if enough bytes are provided.
-// It is recommended to provide at least HeaderMaxSize bytes.
-// If the frame header cannot be read an error will be returned.
-// If there isn't enough input, io.ErrUnexpectedEOF is returned.
-// The FirstBlock.OK will indicate if enough information was available to decode the first block header.
-func (h *Header) DecodeAndStrip(in []byte) (remain []byte, err error) {
-	*h = Header{}
-	if len(in) < 4 {
-		return nil, io.ErrUnexpectedEOF
-	}
-	h.HeaderSize += 4
-	b, in := in[:4], in[4:]
-	if string(b) != frameMagic {
-		if string(b[1:4]) != skippableFrameMagic || b[0]&0xf0 != 0x50 {
-			return nil, ErrMagicMismatch
-		}
-		if len(in) < 4 {
-			return nil, io.ErrUnexpectedEOF
-		}
-		h.HeaderSize += 4
-		h.Skippable = true
-		h.SkippableID = int(b[0] & 0xf)
-		h.SkippableSize = binary.LittleEndian.Uint32(in)
-		return in[4:], nil
-	}
-
-	// Read Window_Descriptor
-	// https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#window_descriptor
-	if len(in) < 1 {
-		return nil, io.ErrUnexpectedEOF
-	}
-	fhd, in := in[0], in[1:]
-	h.HeaderSize++
-	h.SingleSegment = fhd&(1<<5) != 0
-	h.HasCheckSum = fhd&(1<<2) != 0
-	if fhd&(1<<3) != 0 {
-		return nil, errors.New("reserved bit set on frame header")
-	}
-
-	if !h.SingleSegment {
-		if len(in) < 1 {
-			return nil, io.ErrUnexpectedEOF
-		}
-		var wd byte
-		wd, in = in[0], in[1:]
-		h.HeaderSize++
-		windowLog := 10 + (wd >> 3)
-		windowBase := uint64(1) << windowLog
-		windowAdd := (windowBase / 8) * uint64(wd&0x7)
-		h.WindowSize = windowBase + windowAdd
-	}
-
-	// Read Dictionary_ID
-	// https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#dictionary_id
-	if size := fhd & 3; size != 0 {
-		if size == 3 {
-			size = 4
-		}
-		if len(in) < int(size) {
-			return nil, io.ErrUnexpectedEOF
-		}
-		b, in = in[:size], in[size:]
-		h.HeaderSize += int(size)
-		switch len(b) {
-		case 1:
-			h.DictionaryID = uint32(b[0])
-		case 2:
-			h.DictionaryID = uint32(b[0]) | (uint32(b[1]) << 8)
-		case 4:
-			h.DictionaryID = uint32(b[0]) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24)
-		}
-	}
-
-	// Read Frame_Content_Size
-	// https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#frame_content_size
-	var fcsSize int
-	v := fhd >> 6
-	switch v {
-	case 0:
-		if h.SingleSegment {
-			fcsSize = 1
-		}
-	default:
-		fcsSize = 1 << v
-	}
-
-	if fcsSize > 0 {
-		h.HasFCS = true
-		if len(in) < fcsSize {
-			return nil, io.ErrUnexpectedEOF
-		}
-		b, in = in[:fcsSize], in[fcsSize:]
-		h.HeaderSize += int(fcsSize)
-		switch len(b) {
-		case 1:
-			h.FrameContentSize = uint64(b[0])
-		case 2:
-			// When FCS_Field_Size is 2, the offset of 256 is added.
-			h.FrameContentSize = uint64(b[0]) | (uint64(b[1]) << 8) + 256
-		case 4:
-			h.FrameContentSize = uint64(b[0]) | (uint64(b[1]) << 8) | (uint64(b[2]) << 16) | (uint64(b[3]) << 24)
-		case 8:
-			d1 := uint32(b[0]) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24)
-			d2 := uint32(b[4]) | (uint32(b[5]) << 8) | (uint32(b[6]) << 16) | (uint32(b[7]) << 24)
-			h.FrameContentSize = uint64(d1) | (uint64(d2) << 32)
-		}
-	}
-
-	// Frame Header done, we will not fail from now on.
-	if len(in) < 3 {
-		return in, nil
-	}
-	tmp := in[:3]
-	bh := uint32(tmp[0]) | (uint32(tmp[1]) << 8) | (uint32(tmp[2]) << 16)
-	h.FirstBlock.Last = bh&1 != 0
-	blockType := blockType((bh >> 1) & 3)
-	// find size.
-	cSize := int(bh >> 3)
-	switch blockType {
-	case blockTypeReserved:
-		return in, nil
-	case blockTypeRLE:
-		h.FirstBlock.Compressed = true
-		h.FirstBlock.DecompressedSize = cSize
-		h.FirstBlock.CompressedSize = 1
-	case blockTypeCompressed:
-		h.FirstBlock.Compressed = true
-		h.FirstBlock.CompressedSize = cSize
-	case blockTypeRaw:
-		h.FirstBlock.DecompressedSize = cSize
-		h.FirstBlock.CompressedSize = cSize
-	default:
-		panic("Invalid block type")
-	}
-
-	h.FirstBlock.OK = true
-	return in, nil
-}
-
-// AppendTo will append the encoded header to the dst slice.
-// There is no error checking performed on the header values.
-func (h *Header) AppendTo(dst []byte) ([]byte, error) {
-	if h.Skippable {
-		magic := [4]byte{0x50, 0x2a, 0x4d, 0x18}
-		magic[0] |= byte(h.SkippableID & 0xf)
-		dst = append(dst, magic[:]...)
-		f := h.SkippableSize
-		return append(dst, uint8(f), uint8(f>>8), uint8(f>>16), uint8(f>>24)), nil
-	}
-	f := frameHeader{
-		ContentSize:   h.FrameContentSize,
-		WindowSize:    uint32(h.WindowSize),
-		SingleSegment: h.SingleSegment,
-		Checksum:      h.HasCheckSum,
-		DictID:        h.DictionaryID,
-	}
-	return f.appendTo(dst), nil
-}