// NewWriter returns a writer for bzip2-compressed streams.
func NewWriter(out io.Writer) io.WriteCloser {
const blockSize = 9
const verbosity = 0
const workFactor = 30
w := &writer{w: out, stream: C.bz2alloc()}
C.BZ2_bzCompressInit(w.stream, blockSize, verbosity, workFactor)
return w
}
// NewWriter returns a writer for bzip2-compressed streams.
func NewWriter(out io.Writer) io.WriteCloser {
const (
blockSize = 9
verbosity = 0
workFactor = 30
)
w := &writer{w: out, stream: new(C.bz_stream)}
C.BZ2_bzCompressInit(w.stream, blockSize, verbosity, workFactor)
return w
}
// NewWriter returns a writer for bzip2-compressed streams.
func NewWriter(out io.Writer) io.WriteCloser {
const (
blockSize = 9
verbosity = 0
workFactor = 30
)
// NOTE: This code may not work in future Go releases.
// See http://www.gopl.io/errata.html for explanation.
w := &writer{w: out, stream: new(C.bz_stream)}
C.BZ2_bzCompressInit(w.stream, blockSize, verbosity, workFactor)
return w
}
// New bzip2 writer with a specific level and buffer size.
//
// The block size in 100ks must be between 1 and 9, just like with (lib)bzip2,
// and the buffer size should be a reasonable value for all intents and
// purposes.
func NewWriterLevelBufferSize(w io.Writer, blockSize100k int, bufferSize int) (Writer, error) {
bw := &writer{
w: w,
outBuffer: make([]byte, bufferSize),
}
// Initialize the compression stream.
ret := C.BZ2_bzCompressInit(&bw.bzStream, C.int(blockSize100k), C.int(0), C.int(0))
if err := translateError(ret); err != nil {
return nil, err
}
return bw, nil
}