38 lines
836 B
Go
38 lines
836 B
Go
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package sarama
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import (
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"encoding/binary"
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"fmt"
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"hash/crc32"
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)
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// crc32Field implements the pushEncoder and pushDecoder interfaces for calculating CRC32s.
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type crc32Field struct {
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startOffset int
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}
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func (c *crc32Field) saveOffset(in int) {
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c.startOffset = in
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}
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func (c *crc32Field) reserveLength() int {
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return 4
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}
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func (c *crc32Field) run(curOffset int, buf []byte) error {
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crc := crc32.ChecksumIEEE(buf[c.startOffset+4 : curOffset])
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binary.BigEndian.PutUint32(buf[c.startOffset:], crc)
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return nil
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}
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func (c *crc32Field) check(curOffset int, buf []byte) error {
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crc := crc32.ChecksumIEEE(buf[c.startOffset+4 : curOffset])
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expected := binary.BigEndian.Uint32(buf[c.startOffset:])
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if crc != expected {
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return PacketDecodingError{fmt.Sprintf("CRC didn't match expected %#x got %#x", expected, crc)}
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}
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return nil
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}
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