package ioutils // import "github.com/docker/docker/pkg/ioutils" import ( "errors" "io" ) var errBufferFull = errors.New("buffer is full") type fixedBuffer struct { buf []byte pos int lastRead int } func (b *fixedBuffer) Write(p []byte) (int, error) { n := copy(b.buf[b.pos:cap(b.buf)], p) b.pos += n if n < len(p) { if b.pos == cap(b.buf) { return n, errBufferFull } return n, io.ErrShortWrite } return n, nil } func (b *fixedBuffer) Read(p []byte) (int, error) { n := copy(p, b.buf[b.lastRead:b.pos]) b.lastRead += n return n, nil } func (b *fixedBuffer) Len() int { return b.pos - b.lastRead } func (b *fixedBuffer) Cap() int { return cap(b.buf) } func (b *fixedBuffer) Reset() { b.pos = 0 b.lastRead = 0 b.buf = b.buf[:0] } func (b *fixedBuffer) String() string { return string(b.buf[b.lastRead:b.pos]) }