1 files changed, 0 insertions, 90 deletions
diff --git a/src/pkg/compress/bzip2/bit_reader.go b/src/pkg/compress/bzip2/bit_reader.go
deleted file mode 100644
index 32d1036ae..000000000
--- a/src/pkg/compress/bzip2/bit_reader.go
+++ /dev/null
@@ -1,90 +0,0 @@
-// Copyright 2011 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 bzip2
-
-import (
-	"bufio"
-	"io"
-)
-
-// bitReader wraps an io.Reader and provides the ability to read values,
-// bit-by-bit, from it. Its Read* methods don't return the usual error
-// because the error handling was verbose. Instead, any error is kept and can
-// be checked afterwards.
-type bitReader struct {
-	r    io.ByteReader
-	n    uint64
-	bits uint
-	err  error
-}
-
-// newBitReader returns a new bitReader reading from r. If r is not
-// already an io.ByteReader, it will be converted via a bufio.Reader.
-func newBitReader(r io.Reader) bitReader {
-	byter, ok := r.(io.ByteReader)
-	if !ok {
-		byter = bufio.NewReader(r)
-	}
-	return bitReader{r: byter}
-}
-
-// ReadBits64 reads the given number of bits and returns them in the
-// least-significant part of a uint64. In the event of an error, it returns 0
-// and the error can be obtained by calling Err().
-func (br *bitReader) ReadBits64(bits uint) (n uint64) {
-	for bits > br.bits {
-		b, err := br.r.ReadByte()
-		if err == io.EOF {
-			err = io.ErrUnexpectedEOF
-		}
-		if err != nil {
-			br.err = err
-			return 0
-		}
-		br.n <<= 8
-		br.n |= uint64(b)
-		br.bits += 8
-	}
-
-	// br.n looks like this (assuming that br.bits = 14 and bits = 6):
-	// Bit: 111111
-	//      5432109876543210
-	//
-	//         (6 bits, the desired output)
-	//        |-----|
-	//        V     V
-	//      0101101101001110
-	//        ^            ^
-	//        |------------|
-	//           br.bits (num valid bits)
-	//
-	// This the next line right shifts the desired bits into the
-	// least-significant places and masks off anything above.
-	n = (br.n >> (br.bits - bits)) & ((1 << bits) - 1)
-	br.bits -= bits
-	return
-}
-
-func (br *bitReader) ReadBits(bits uint) (n int) {
-	n64 := br.ReadBits64(bits)
-	return int(n64)
-}
-
-func (br *bitReader) ReadBit() bool {
-	n := br.ReadBits(1)
-	return n != 0
-}
-
-func (br *bitReader) TryReadBit() (bit byte, ok bool) {
-	if br.bits > 0 {
-		br.bits--
-		return byte(br.n>>br.bits) & 1, true
-	}
-	return 0, false
-}
-
-func (br *bitReader) Err() error {
-	return br.err
-}