ml
42 lines
1.0 KiB
Go
42 lines
1.0 KiB
Go
package compression
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import "github.com/inkyblackness/hacked/ss1/serial"
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// WordReader provides word instances from a serialized stream.
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type WordReader struct {
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coder serial.Coder
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buffer byte
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bufferBitsAvailable uint
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}
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// NewWordReader returns a new instance.
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func NewWordReader(coder serial.Coder) *WordReader {
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reader := &WordReader{coder: coder, buffer: 0x00, bufferBitsAvailable: 0}
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return reader
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}
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// Read returns the next word from the stream.
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func (reader *WordReader) Read() (value Word) {
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remaining := bitsPerWord
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for remaining > reader.bufferBitsAvailable {
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value = Word((uint(value) << reader.bufferBitsAvailable) | uint(reader.buffer))
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remaining -= reader.bufferBitsAvailable
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reader.bufferByte()
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}
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value = Word((uint(value) << remaining) | uint(reader.buffer)>>(8-remaining))
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reader.buffer &= 1<<(8-remaining) - 1
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reader.bufferBitsAvailable -= remaining
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return
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}
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func (reader *WordReader) bufferByte() {
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reader.coder.Code(&reader.buffer)
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reader.bufferBitsAvailable = 8
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}
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