325 lines
6.3 KiB
Go
325 lines
6.3 KiB
Go
// Copyright (c) 2012-2020 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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package codec
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import "io"
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// encWriter abstracts writing to a byte array or to an io.Writer.
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type encWriter interface {
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writeb([]byte)
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writestr(string)
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writeqstr(string) // write string wrapped in quotes ie "..."
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writen1(byte)
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// add convenience functions for writing 2,4
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writen2(byte, byte)
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writen4([4]byte)
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writen8([8]byte)
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end()
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}
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// ---------------------------------------------
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type bufioEncWriter struct {
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w io.Writer
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buf []byte
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n int
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b [16]byte // scratch buffer and padding (cache-aligned)
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}
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func (z *bufioEncWriter) reset(w io.Writer, bufsize int, blist *bytesFreelist) {
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z.w = w
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z.n = 0
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if bufsize <= 0 {
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bufsize = defEncByteBufSize
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}
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// bufsize must be >= 8, to accomodate writen methods (where n <= 8)
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if bufsize <= 8 {
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bufsize = 8
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}
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if cap(z.buf) < bufsize {
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if len(z.buf) > 0 && &z.buf[0] != &z.b[0] {
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blist.put(z.buf)
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}
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if len(z.b) > bufsize {
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z.buf = z.b[:]
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} else {
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z.buf = blist.get(bufsize)
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}
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}
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z.buf = z.buf[:cap(z.buf)]
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}
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func (z *bufioEncWriter) flushErr() (err error) {
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n, err := z.w.Write(z.buf[:z.n])
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z.n -= n
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if z.n > 0 {
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if err == nil {
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err = io.ErrShortWrite
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}
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if n > 0 {
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copy(z.buf, z.buf[n:z.n+n])
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}
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}
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return err
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}
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func (z *bufioEncWriter) flush() {
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halt.onerror(z.flushErr())
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}
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func (z *bufioEncWriter) writeb(s []byte) {
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LOOP:
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a := len(z.buf) - z.n
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if len(s) > a {
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z.n += copy(z.buf[z.n:], s[:a])
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s = s[a:]
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z.flush()
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goto LOOP
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}
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z.n += copy(z.buf[z.n:], s)
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}
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func (z *bufioEncWriter) writestr(s string) {
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// z.writeb(bytesView(s)) // inlined below
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LOOP:
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a := len(z.buf) - z.n
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if len(s) > a {
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z.n += copy(z.buf[z.n:], s[:a])
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s = s[a:]
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z.flush()
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goto LOOP
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}
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z.n += copy(z.buf[z.n:], s)
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}
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func (z *bufioEncWriter) writeqstr(s string) {
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// z.writen1('"')
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// z.writestr(s)
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// z.writen1('"')
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if z.n+len(s)+2 > len(z.buf) {
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z.flush()
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}
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setByteAt(z.buf, uint(z.n), '"')
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// z.buf[z.n] = '"'
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z.n++
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LOOP:
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a := len(z.buf) - z.n
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if len(s)+1 > a {
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z.n += copy(z.buf[z.n:], s[:a])
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s = s[a:]
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z.flush()
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goto LOOP
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}
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z.n += copy(z.buf[z.n:], s)
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setByteAt(z.buf, uint(z.n), '"')
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// z.buf[z.n] = '"'
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z.n++
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}
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func (z *bufioEncWriter) writen1(b1 byte) {
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if 1 > len(z.buf)-z.n {
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z.flush()
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}
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setByteAt(z.buf, uint(z.n), b1)
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// z.buf[z.n] = b1
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z.n++
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}
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func (z *bufioEncWriter) writen2(b1, b2 byte) {
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if 2 > len(z.buf)-z.n {
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z.flush()
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}
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setByteAt(z.buf, uint(z.n+1), b2)
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setByteAt(z.buf, uint(z.n), b1)
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// z.buf[z.n+1] = b2
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// z.buf[z.n] = b1
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z.n += 2
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}
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func (z *bufioEncWriter) writen4(b [4]byte) {
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if 4 > len(z.buf)-z.n {
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z.flush()
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}
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// setByteAt(z.buf, uint(z.n+3), b4)
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// setByteAt(z.buf, uint(z.n+2), b3)
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// setByteAt(z.buf, uint(z.n+1), b2)
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// setByteAt(z.buf, uint(z.n), b1)
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copy(z.buf[z.n:], b[:])
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z.n += 4
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}
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func (z *bufioEncWriter) writen8(b [8]byte) {
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if 8 > len(z.buf)-z.n {
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z.flush()
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}
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copy(z.buf[z.n:], b[:])
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z.n += 8
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}
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func (z *bufioEncWriter) endErr() (err error) {
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if z.n > 0 {
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err = z.flushErr()
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}
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return
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}
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// ---------------------------------------------
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// bytesEncAppender implements encWriter and can write to an byte slice.
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type bytesEncAppender struct {
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b []byte
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out *[]byte
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}
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func (z *bytesEncAppender) writeb(s []byte) {
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z.b = append(z.b, s...)
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}
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func (z *bytesEncAppender) writestr(s string) {
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z.b = append(z.b, s...)
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}
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func (z *bytesEncAppender) writeqstr(s string) {
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z.b = append(append(append(z.b, '"'), s...), '"')
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// z.b = append(z.b, '"')
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// z.b = append(z.b, s...)
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// z.b = append(z.b, '"')
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}
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func (z *bytesEncAppender) writen1(b1 byte) {
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z.b = append(z.b, b1)
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}
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func (z *bytesEncAppender) writen2(b1, b2 byte) {
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z.b = append(z.b, b1, b2)
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}
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func (z *bytesEncAppender) writen4(b [4]byte) {
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z.b = append(z.b, b[:]...)
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// z.b = append(z.b, b1, b2, b3, b4) // prevents inlining encWr.writen4
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}
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func (z *bytesEncAppender) writen8(b [8]byte) {
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z.b = append(z.b, b[:]...)
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// z.b = append(z.b, b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]) // prevents inlining encWr.writen4
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}
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func (z *bytesEncAppender) endErr() error {
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*(z.out) = z.b
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return nil
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}
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func (z *bytesEncAppender) reset(in []byte, out *[]byte) {
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z.b = in[:0]
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z.out = out
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}
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// --------------------------------------------------
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type encWr struct {
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wb bytesEncAppender
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wf *bufioEncWriter
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bytes bool // encoding to []byte
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// MARKER: these fields below should belong directly in Encoder.
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// we pack them here for space efficiency and cache-line optimization.
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js bool // is json encoder?
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be bool // is binary encoder?
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c containerState
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calls uint16
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seq uint16 // sequencer (e.g. used by binc for symbols, etc)
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}
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// MARKER: manually inline bytesEncAppender.writenx/writeqstr methods,
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// as calling them causes encWr.writenx/writeqstr methods to not be inlined (cost > 80).
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//
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// i.e. e.g. instead of writing z.wb.writen2(b1, b2), use z.wb.b = append(z.wb.b, b1, b2)
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func (z *encWr) writeb(s []byte) {
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if z.bytes {
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z.wb.writeb(s)
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} else {
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z.wf.writeb(s)
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}
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}
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func (z *encWr) writestr(s string) {
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if z.bytes {
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z.wb.writestr(s)
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} else {
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z.wf.writestr(s)
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}
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}
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// MARKER: Add WriteStr to be called directly by generated code without a genHelper forwarding function.
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// Go's inlining model adds cost for forwarding functions, preventing inlining (cost goes above 80 budget).
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func (z *encWr) WriteStr(s string) {
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if z.bytes {
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z.wb.writestr(s)
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} else {
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z.wf.writestr(s)
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}
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}
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func (z *encWr) writen1(b1 byte) {
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if z.bytes {
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z.wb.writen1(b1)
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} else {
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z.wf.writen1(b1)
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}
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}
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func (z *encWr) writen2(b1, b2 byte) {
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if z.bytes {
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// MARKER: z.wb.writen2(b1, b2)
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z.wb.b = append(z.wb.b, b1, b2)
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} else {
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z.wf.writen2(b1, b2)
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}
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}
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func (z *encWr) writen4(b [4]byte) {
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if z.bytes {
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// MARKER: z.wb.writen4(b1, b2, b3, b4)
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z.wb.b = append(z.wb.b, b[:]...)
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// z.wb.writen4(b)
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} else {
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z.wf.writen4(b)
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}
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}
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func (z *encWr) writen8(b [8]byte) {
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if z.bytes {
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// z.wb.b = append(z.wb.b, b[:]...)
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z.wb.writen8(b)
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} else {
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z.wf.writen8(b)
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}
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}
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func (z *encWr) writeqstr(s string) {
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if z.bytes {
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// MARKER: z.wb.writeqstr(s)
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z.wb.b = append(append(append(z.wb.b, '"'), s...), '"')
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} else {
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z.wf.writeqstr(s)
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}
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}
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func (z *encWr) endErr() error {
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if z.bytes {
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return z.wb.endErr()
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}
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return z.wf.endErr()
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}
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func (z *encWr) end() {
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halt.onerror(z.endErr())
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}
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var _ encWriter = (*encWr)(nil)
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