63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
package git
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import (
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"io"
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"math"
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)
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type packetReader struct {
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proto *protocol
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buf []byte
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}
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var _ io.Reader = new(packetReader)
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func (r *packetReader) Read(p []byte) (int, error) {
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var n int
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if len(r.buf) > 0 {
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// If there is data in the buffer, shift as much out of it and
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// into the given "p" as we can.
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n = int(math.Min(float64(len(p)), float64(len(r.buf))))
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copy(p, r.buf[:n])
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r.buf = r.buf[n:]
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}
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// Loop and grab as many packets as we can in a given "run", until we
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// have either, a) overfilled the given buffer "p", or we have started
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// to internally buffer in "r.buf".
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for len(r.buf) == 0 {
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chunk, err := r.proto.readPacket()
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if err != nil {
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return n, err
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}
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if len(chunk) == 0 {
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// If we got an empty chunk, then we know that we have
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// reached the end of processing for this particular
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// packet, so let's terminate.
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return n, io.EOF
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}
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// Figure out how much of the packet we can read into "p".
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nn := int(math.Min(float64(len(chunk)), float64(len(p))))
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// Move that amount into "p", from where we left off.
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copy(p[n:], chunk[:nn])
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// And move the rest into the buffer.
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r.buf = append(r.buf, chunk[nn:]...)
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// Mark that we have read "nn" bytes into "p"
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n += nn
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if n >= len(p) {
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break
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}
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}
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return n, nil
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}
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