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49 lines
971 B
49 lines
971 B
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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