47 lines
764 B
Go
47 lines
764 B
Go
package azblob
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import (
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"errors"
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"io"
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)
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type sectionWriter struct {
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count int64
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offset int64
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position int64
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writerAt io.WriterAt
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}
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func newSectionWriter(c io.WriterAt, off int64, count int64) *sectionWriter {
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return §ionWriter{
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count: count,
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offset: off,
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writerAt: c,
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}
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}
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func (c *sectionWriter) Write(p []byte) (int, error) {
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remaining := c.count - c.position
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if remaining <= 0 {
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return 0, errors.New("End of section reached")
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}
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slice := p
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if int64(len(slice)) > remaining {
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slice = slice[:remaining]
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}
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n, err := c.writerAt.WriteAt(slice, c.offset+c.position)
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c.position += int64(n)
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if err != nil {
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return n, err
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}
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if len(p) > n {
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return n, errors.New("Not enough space for all bytes")
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}
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return n, nil
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}
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