corvus-ch/horcrux

package qr
 
import (
    "fmt"
    "io"
 
    "github.com/corvus-ch/horcrux/input"
    "github.com/corvus-ch/zbase32"
)
 
// Name holds the name of the Format.
const Name = "qr"
 
const alphabet = "YBNDRFG8EJKMCPQXOT1UWISZA345H769"
 
var encoding = zbase32.NewEncoding(alphabet)
 
// New creates a new Format of type raw.
func New(input input.Input) *Format {
    return &Format{
        in: input,
    }
}
 
// Format represents the raw type format.
type Format struct {
    in input.Input
}
 
// OutputFileName returns the file name for the given x.
func (f *Format) OutputFileName(x byte) string {
    return fmt.Sprintf("%s.png.%03d", f.in.Stem(), x)
}
 
// Writer creates a new QR code format writer for the part identified by x.
func (f *Format) Writer(x byte) (io.Writer, []io.Closer, error) {
    w := NewWriter(f.in, x)
    enc := zbase32.NewEncoder(encoding, w)
 
    return enc, []io.Closer{w, enc}, nil
}
 
// Reader creates a new Format reader using the given reader as input.
func (f *Format) Reader(r io.Reader) (io.Reader, error) {
    return nil, fmt.Errorf("format does not yet have read support")
}
 
// Name returns the formats name.
func (f *Format) Name() string {
    return Name
}