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55 lines
1.0 KiB
55 lines
1.0 KiB
package jstream
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import (
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"bytes"
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"encoding/base64"
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"io"
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)
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type delimReader struct {
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r io.Reader
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delim byte
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rest []byte
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}
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func (dr *delimReader) Read(b []byte) (int, error) {
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if dr.delim != 0 {
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return 0, io.EOF
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}
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n, err := dr.r.Read(b)
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if i := bytes.IndexAny(b[:n], bbDelims); i >= 0 {
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dr.delim = b[i]
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dr.rest = append([]byte(nil), b[i+1:n]...)
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return i, err
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}
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return n, err
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}
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type byteBlobReader struct {
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dr *delimReader
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dec io.Reader
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}
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func newByteBlobReader(r io.Reader) *byteBlobReader {
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dr := &delimReader{r: r}
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return &byteBlobReader{
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dr: dr,
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dec: base64.NewDecoder(base64.StdEncoding, dr),
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}
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}
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func (bbr *byteBlobReader) Read(into []byte) (int, error) {
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n, err := bbr.dec.Read(into)
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if bbr.dr.delim == bbEnd {
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return n, io.EOF
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} else if bbr.dr.delim == bbCancel {
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return n, ErrCanceled
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}
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return n, err
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}
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// returns the bytes which were read off the underlying io.Reader but which
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// haven't been consumed yet.
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func (bbr *byteBlobReader) buffered() io.Reader {
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return bytes.NewBuffer(bbr.dr.rest)
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}
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