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50 lines
971 B
50 lines
971 B
3 years ago
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package bin
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import "strconv"
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// Fields represent a bitfield value that compactly encodes
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// information about provided conditional fields, e.g. says
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// that fields "1", "5" and "10" were set.
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type Fields uint32
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// Zero returns true, if all bits are equal to zero.
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func (f Fields) Zero() bool {
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return f == 0
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}
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// String implement fmt.Stringer
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func (f Fields) String() string {
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return strconv.FormatUint(uint64(f), 2)
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}
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// Decode implements Decoder.
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func (f *Fields) Decode(b *Buffer) error {
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v, err := b.Int32()
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if err != nil {
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return err
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}
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*f = Fields(v)
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return nil
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}
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// Encode implements Encoder.
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func (f Fields) Encode(b *Buffer) error {
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b.PutUint32(uint32(f))
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return nil
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}
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// Has reports whether field with index n was set.
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func (f Fields) Has(n int) bool {
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return f&(1<<n) != 0
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}
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// Unset unsets field with index n.
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func (f *Fields) Unset(n int) {
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*f &= ^(1 << n)
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}
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// Set sets field with index n.
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func (f *Fields) Set(n int) {
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*f |= 1 << n
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}
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