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fq/pkg/interp/hexdump.go
2021-09-12 13:08:50 +02:00

45 lines
1.2 KiB
Go

package interp
import (
"io"
"github.com/wader/fq/internal/asciiwriter"
"github.com/wader/fq/internal/hexdump"
"github.com/wader/fq/internal/hexpairwriter"
"github.com/wader/fq/internal/num"
"github.com/wader/fq/pkg/bitio"
)
func hexdumpRange(bbr bufferRange, w io.Writer, opts Options) error {
bitsByteAlign := bbr.r.Start % 8
bb, err := bbr.bb.BitBufRange(bbr.r.Start-bitsByteAlign, bbr.r.Len+bitsByteAlign)
if err != nil {
return err
}
br := bitio.NewSectionBitReader(bb, 0, bb.Len())
d := opts.Decorator
hw := hexdump.New(
w,
(bbr.r.Start-bitsByteAlign)/8,
num.DigitsInBase(bitio.BitsByteCount(bbr.r.Stop()+bitsByteAlign), true, opts.AddrBase),
opts.AddrBase,
opts.LineBytes,
func(b byte) string { return d.ByteColor(b).Wrap(hexpairwriter.Pair(b)) },
func(b byte) string { return d.ByteColor(b).Wrap(asciiwriter.SafeASCII(b)) },
func(s string) string { return d.DumpHeader.Wrap(s) },
func(s string) string { return d.DumpAddr.Wrap(s) },
d.Column,
)
aw := &bitio.AlignBitWriter{W: hw, N: 8}
// TODO: ugly, AlignBitWriter take Closer? some other way?
defer hw.Close()
defer aw.Close()
if _, err = bitio.Copy(aw, br); err != nil {
return err
}
return nil
}