From 8c12c6939aab9106db14ec2d11d983bc5b29fb2c Mon Sep 17 00:00:00 2001
From: Niall Sheridan <nsheridan@gmail.com>
Date: Sun, 7 Jul 2019 21:33:44 +0100
Subject: Switch to modules

---
 vendor/golang.org/x/net/http2/hpack/huffman.go | 222 -------------------------
 1 file changed, 222 deletions(-)
 delete mode 100644 vendor/golang.org/x/net/http2/hpack/huffman.go

(limited to 'vendor/golang.org/x/net/http2/hpack/huffman.go')

diff --git a/vendor/golang.org/x/net/http2/hpack/huffman.go b/vendor/golang.org/x/net/http2/hpack/huffman.go
deleted file mode 100644
index b412a96..0000000
--- a/vendor/golang.org/x/net/http2/hpack/huffman.go
+++ /dev/null
@@ -1,222 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package hpack
-
-import (
-	"bytes"
-	"errors"
-	"io"
-	"sync"
-)
-
-var bufPool = sync.Pool{
-	New: func() interface{} { return new(bytes.Buffer) },
-}
-
-// HuffmanDecode decodes the string in v and writes the expanded
-// result to w, returning the number of bytes written to w and the
-// Write call's return value. At most one Write call is made.
-func HuffmanDecode(w io.Writer, v []byte) (int, error) {
-	buf := bufPool.Get().(*bytes.Buffer)
-	buf.Reset()
-	defer bufPool.Put(buf)
-	if err := huffmanDecode(buf, 0, v); err != nil {
-		return 0, err
-	}
-	return w.Write(buf.Bytes())
-}
-
-// HuffmanDecodeToString decodes the string in v.
-func HuffmanDecodeToString(v []byte) (string, error) {
-	buf := bufPool.Get().(*bytes.Buffer)
-	buf.Reset()
-	defer bufPool.Put(buf)
-	if err := huffmanDecode(buf, 0, v); err != nil {
-		return "", err
-	}
-	return buf.String(), nil
-}
-
-// ErrInvalidHuffman is returned for errors found decoding
-// Huffman-encoded strings.
-var ErrInvalidHuffman = errors.New("hpack: invalid Huffman-encoded data")
-
-// huffmanDecode decodes v to buf.
-// If maxLen is greater than 0, attempts to write more to buf than
-// maxLen bytes will return ErrStringLength.
-func huffmanDecode(buf *bytes.Buffer, maxLen int, v []byte) error {
-	rootHuffmanNode := getRootHuffmanNode()
-	n := rootHuffmanNode
-	// cur is the bit buffer that has not been fed into n.
-	// cbits is the number of low order bits in cur that are valid.
-	// sbits is the number of bits of the symbol prefix being decoded.
-	cur, cbits, sbits := uint(0), uint8(0), uint8(0)
-	for _, b := range v {
-		cur = cur<<8 | uint(b)
-		cbits += 8
-		sbits += 8
-		for cbits >= 8 {
-			idx := byte(cur >> (cbits - 8))
-			n = n.children[idx]
-			if n == nil {
-				return ErrInvalidHuffman
-			}
-			if n.children == nil {
-				if maxLen != 0 && buf.Len() == maxLen {
-					return ErrStringLength
-				}
-				buf.WriteByte(n.sym)
-				cbits -= n.codeLen
-				n = rootHuffmanNode
-				sbits = cbits
-			} else {
-				cbits -= 8
-			}
-		}
-	}
-	for cbits > 0 {
-		n = n.children[byte(cur<<(8-cbits))]
-		if n == nil {
-			return ErrInvalidHuffman
-		}
-		if n.children != nil || n.codeLen > cbits {
-			break
-		}
-		if maxLen != 0 && buf.Len() == maxLen {
-			return ErrStringLength
-		}
-		buf.WriteByte(n.sym)
-		cbits -= n.codeLen
-		n = rootHuffmanNode
-		sbits = cbits
-	}
-	if sbits > 7 {
-		// Either there was an incomplete symbol, or overlong padding.
-		// Both are decoding errors per RFC 7541 section 5.2.
-		return ErrInvalidHuffman
-	}
-	if mask := uint(1<<cbits - 1); cur&mask != mask {
-		// Trailing bits must be a prefix of EOS per RFC 7541 section 5.2.
-		return ErrInvalidHuffman
-	}
-
-	return nil
-}
-
-type node struct {
-	// children is non-nil for internal nodes
-	children *[256]*node
-
-	// The following are only valid if children is nil:
-	codeLen uint8 // number of bits that led to the output of sym
-	sym     byte  // output symbol
-}
-
-func newInternalNode() *node {
-	return &node{children: new([256]*node)}
-}
-
-var (
-	buildRootOnce       sync.Once
-	lazyRootHuffmanNode *node
-)
-
-func getRootHuffmanNode() *node {
-	buildRootOnce.Do(buildRootHuffmanNode)
-	return lazyRootHuffmanNode
-}
-
-func buildRootHuffmanNode() {
-	if len(huffmanCodes) != 256 {
-		panic("unexpected size")
-	}
-	lazyRootHuffmanNode = newInternalNode()
-	for i, code := range huffmanCodes {
-		addDecoderNode(byte(i), code, huffmanCodeLen[i])
-	}
-}
-
-func addDecoderNode(sym byte, code uint32, codeLen uint8) {
-	cur := lazyRootHuffmanNode
-	for codeLen > 8 {
-		codeLen -= 8
-		i := uint8(code >> codeLen)
-		if cur.children[i] == nil {
-			cur.children[i] = newInternalNode()
-		}
-		cur = cur.children[i]
-	}
-	shift := 8 - codeLen
-	start, end := int(uint8(code<<shift)), int(1<<shift)
-	for i := start; i < start+end; i++ {
-		cur.children[i] = &node{sym: sym, codeLen: codeLen}
-	}
-}
-
-// AppendHuffmanString appends s, as encoded in Huffman codes, to dst
-// and returns the extended buffer.
-func AppendHuffmanString(dst []byte, s string) []byte {
-	rembits := uint8(8)
-
-	for i := 0; i < len(s); i++ {
-		if rembits == 8 {
-			dst = append(dst, 0)
-		}
-		dst, rembits = appendByteToHuffmanCode(dst, rembits, s[i])
-	}
-
-	if rembits < 8 {
-		// special EOS symbol
-		code := uint32(0x3fffffff)
-		nbits := uint8(30)
-
-		t := uint8(code >> (nbits - rembits))
-		dst[len(dst)-1] |= t
-	}
-
-	return dst
-}
-
-// HuffmanEncodeLength returns the number of bytes required to encode
-// s in Huffman codes. The result is round up to byte boundary.
-func HuffmanEncodeLength(s string) uint64 {
-	n := uint64(0)
-	for i := 0; i < len(s); i++ {
-		n += uint64(huffmanCodeLen[s[i]])
-	}
-	return (n + 7) / 8
-}
-
-// appendByteToHuffmanCode appends Huffman code for c to dst and
-// returns the extended buffer and the remaining bits in the last
-// element. The appending is not byte aligned and the remaining bits
-// in the last element of dst is given in rembits.
-func appendByteToHuffmanCode(dst []byte, rembits uint8, c byte) ([]byte, uint8) {
-	code := huffmanCodes[c]
-	nbits := huffmanCodeLen[c]
-
-	for {
-		if rembits > nbits {
-			t := uint8(code << (rembits - nbits))
-			dst[len(dst)-1] |= t
-			rembits -= nbits
-			break
-		}
-
-		t := uint8(code >> (nbits - rembits))
-		dst[len(dst)-1] |= t
-
-		nbits -= rembits
-		rembits = 8
-
-		if nbits == 0 {
-			break
-		}
-
-		dst = append(dst, 0)
-	}
-
-	return dst, rembits
-}
-- 
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