Move the base64 decode to the internal package

1 files changed, 0 insertions, 121 deletions

diff --git a/base64.go b/base64.go
deleted file mode 100644
index 86fc293..0000000
--- a/base64.go
+++ /dev/null
@@ -1,121 +0,0 @@
-// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
-//
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-package lowmemjson
-
-import (
-	"encoding/base64"
-	"io"
-	"strings"
-)
-
-type base64Decoder struct {
-	dst io.Writer
-
-	err    error
-	pos    int64
-	buf    [4]byte
-	bufLen int
-}
-
-func newBase64Decoder(w io.Writer) io.WriteCloser {
-	return &base64Decoder{
-		dst: w,
-	}
-}
-
-func (dec *base64Decoder) decodeByte(b byte) (byte, bool) {
-	const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
-	n := strings.IndexByte(alphabet, b)
-	if n < 0 {
-		return 0, false
-	}
-	dec.pos++
-	return byte(n), true
-}
-
-func (dec *base64Decoder) decodeTuple(a, b, c, d byte) error {
-	var decodedLen int
-	var encoded [4]byte
-	var ok bool
-
-	if a != '=' {
-		encoded[0], ok = dec.decodeByte(a)
-		if !ok {
-			return base64.CorruptInputError(dec.pos)
-		}
-		decodedLen++
-	}
-	if b != '=' {
-		encoded[1], ok = dec.decodeByte(b)
-		if !ok {
-			return base64.CorruptInputError(dec.pos)
-		}
-		// do NOT increment decodedLen here
-	}
-	if c != '=' {
-		encoded[2], ok = dec.decodeByte(c)
-		if !ok {
-			return base64.CorruptInputError(dec.pos)
-		}
-		decodedLen++
-	}
-	if d != '=' {
-		encoded[3], ok = dec.decodeByte(d)
-		if !ok {
-			return base64.CorruptInputError(dec.pos)
-		}
-		decodedLen++
-	}
-
-	val := 0 |
-		uint32(encoded[0])<<18 |
-		uint32(encoded[1])<<12 |
-		uint32(encoded[2])<<6 |
-		uint32(encoded[3])<<0
-	var decoded [3]byte
-	decoded[0] = byte(val >> 16)
-	decoded[1] = byte(val >> 8)
-	decoded[2] = byte(val >> 0)
-
-	_, err := dec.dst.Write(decoded[:decodedLen])
-	return err
-}
-
-func (dec *base64Decoder) Write(dat []byte) (int, error) {
-	if len(dat) == 0 {
-		return 0, nil
-	}
-	if dec.err != nil {
-		return 0, dec.err
-	}
-	var n int
-	if dec.bufLen > 0 {
-		n = copy(dec.buf[dec.bufLen:], dat)
-		dec.bufLen += n
-		if dec.bufLen < 4 {
-			return len(dat), nil
-		}
-		if err := dec.decodeTuple(dec.buf[0], dec.buf[1], dec.buf[2], dec.buf[3]); err != nil {
-			dec.err = err
-			return 0, dec.err
-		}
-	}
-	for ; n+3 < len(dat); n += 4 {
-		if err := dec.decodeTuple(dat[n], dat[n+1], dat[n+2], dat[n+3]); err != nil {
-			dec.err = err
-			return n, dec.err
-		}
-	}
-	dec.bufLen = copy(dec.buf[:], dat[n:])
-	return len(dat), nil
-}
-
-func (dec *base64Decoder) Close() error {
-	if dec.bufLen == 0 {
-		return nil
-	}
-	copy(dec.buf[:], "====")
-	return dec.decodeTuple(dec.buf[0], dec.buf[1], dec.buf[2], dec.buf[3])
-}