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https://github.com/wader/fq.git
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7c5215347d
Remove bitio.Buffer layer. bitio.Buffer was a kitchen sink layer with helpers now it's just a buffer and most functions have been moved to decode instead. bitio package now only have primitive types and functions simialar to standard library io and bytes packages. Make nearly eveything internally use bitio.Bit* interfaces so that slicing work correctly this will also make it possible to start experimenting with more complicated silcing helpers, ex things like: breplace(.header.bitrate; 123) to get a new buffer with bitrate changed.
57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
package bitioextra
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// bitio helpers that don't really belong in bitio
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import (
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"errors"
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"io"
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"github.com/wader/fq/pkg/bitio"
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)
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func CopyBitsBuffer(dst io.Writer, src bitio.Reader, buf []byte) (int64, error) {
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return io.CopyBuffer(dst, bitio.NewIOReader(src), buf)
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}
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func CopyBits(dst io.Writer, src bitio.Reader) (int64, error) {
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return CopyBitsBuffer(dst, src, nil)
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}
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func Clone(br bitio.ReaderAtSeeker) (bitio.ReaderAtSeeker, error) {
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l, err := Len(br)
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if err != nil {
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return nil, err
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}
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return bitio.NewSectionReader(br, 0, l), nil
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}
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func Len(br bitio.ReadAtSeeker) (int64, error) {
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bPos, err := br.SeekBits(0, io.SeekCurrent)
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if err != nil {
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return 0, err
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}
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bEnd, err := br.SeekBits(0, io.SeekEnd)
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if err != nil {
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return 0, err
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}
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if _, err := br.SeekBits(bPos, io.SeekStart); err != nil {
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return 0, err
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}
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return bEnd, nil
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}
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func Range(br bitio.ReadAtSeeker, firstBitOffset int64, nBits int64) (bitio.ReaderAtSeeker, error) {
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l, err := Len(br)
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if err != nil {
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return nil, err
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}
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// TODO: move error check?
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if nBits < 0 {
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return nil, errors.New("negative nBits")
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}
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if firstBitOffset+nBits > l {
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return nil, errors.New("outside buffer")
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}
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return bitio.NewSectionReader(br, firstBitOffset, nBits), nil
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}
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