You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: transform.go
    path of file: ./repos/sliver/implant/vendor/golang.org/x/text/transform
    
    the code of the file until where you have to start completion: // Copyright 2013 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 transform provides reader and writer wrappers that transform the
// bytes passing through as well as various transformations. Example
// transformations provided by other packages include normalization and
// conversion between character sets.
package transform // import "golang.org/x/text/transform"

import (
	"bytes"
	"errors"
	"io"
	"unicode/utf8"
)

var (
	// ErrShortDst means that the destination buffer was too short to
	// receive all of the transformed bytes.
	ErrShortDst = errors.New("transform: short destination buffer")

	// ErrShortSrc means that the source buffer
    
func (c *chain) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
	// Set up src and dst in the chain.
	srcL := &c.link[0]
	dstL := &c.link[len(c.link)-1]
	srcL.b, srcL.p, srcL.n = src, 0, len(src)
	dstL.b, dstL.n = dst, 0
	var lastFull, needProgress bool // for detecting progress

	// i is the index of the next Transformer to apply, for i in [low, high].
	// low is the lowest index for which c.link[low] may still produce bytes.
	// high is the highest index for which c.link[high] has a Transformer.
	// The error returned by Transform determines whether to increase or
	// decrease i. We try to completely fill a buffer before converting it.
	for low, i, high := c.errStart, c.errStart, len(c.link)-2; low <= i && i <= high; {
		in, out := &c.link[i], &c.link[i+1]
		nDst, nSrc, err0 := in.t.Transform(out.dst(), in.src(), atEOF && low == i)
		out.n += nDst
		in.p += nSrc
		if i > 0 && in.p == in.n {
			in.p, in.n = 0, 0
		}
		needProgress, lastFull = lastFull, false
		switch err0 {
		case ErrShortDst:
			// Process the destination buffer next. Return if we are already
			// at the high index.
			if i == high {
				return dstL.n, srcL.p, ErrShortDst
			}
			if out.n != 0 {
				i++
				// If the Transformer at the next index is not able to process any
				// source bytes there is nothing that can be done to make progress
				// and the bytes will remain unprocessed. lastFull is used to
				// detect this and break out of the loop with a fatal error.
				lastFull = true
				continue
			}
			// The destination buffer was too small, but is completely empty.
			// Return a fatal error as this transformation can never complete.
			c.fatalError(i, errShortInternal)
		case ErrShortSrc:
			if i == 0 {
				// Save ErrShortSrc in err. All other errors take precedence.
				err = ErrShortSrc
				break
			}
			// Source bytes were depleted before filling up the destination buffer.
			// Verify we made some progress, move the remaining bytes to the errStart
			// and try to get more source bytes.
			if needProgress && nSrc == 0 || in.n-in.p == len(in.b) {
				// There were not enough source bytes to proceed while the source
				// buffer cannot hold any more bytes. Return a fatal error as this
				// transformation can never complete.
				c.fatalError(i, errShortInternal)
				break
			}
			// in.b is an internal buffer and we can make progress.
			in.p, in.n = 0, copy(in.b, in.src())
			fallthrough
		case nil:
			// if i == low, we have depleted the bytes at index i or any lower levels.
			// In that case we increase low and i. In all other cases we decrease i to
			// fetch more bytes before proceeding to the next index.
			if i > low {
				i--
				continue
			}
		default:
			c.fatalError(i, err0)
		}
		// Exhausted level low or fatal error: increase low and continue
		// to process the bytes accepted so far.
		i++
		low = i
	}

	// If c.errStart > 0, this means we found a fatal error.  We will clear
	// all upstream buffers. At this point, no more progress can be made
	// downstream, as Transform would have bailed while handling ErrShortDst.
	if c.errStart > 0 {
		for i := 1; i < c.errStart; i++ {
			c.link[i].p, c.link[i].n = 0, 0
		}
		err, c.errStart, c.err = c.err, 0, nil
	}
	return dstL.n, srcL.p, err
}