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72f68d8340
While at it, also re-order vendor.conf to be (more) alphabetical. Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
67 lines
2.2 KiB
Go
67 lines
2.2 KiB
Go
package iso9660wrap
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import (
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"time"
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)
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func WriteDirectoryRecord(w *SectorWriter, identifier string, firstSectorNum uint32) uint32 {
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if len(identifier) > 30 {
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Panicf("directory identifier length %d is out of bounds", len(identifier))
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}
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recordLength := 33 + len(identifier)
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w.WriteByte(byte(recordLength))
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w.WriteByte(0) // number of sectors in extended attribute record
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w.WriteBothEndianDWord(firstSectorNum)
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w.WriteBothEndianDWord(SectorSize) // directory length
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writeDirectoryRecordtimestamp(w, time.Now())
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w.WriteByte(byte(3)) // bitfield; directory
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w.WriteByte(byte(0)) // file unit size for an interleaved file
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w.WriteByte(byte(0)) // interleave gap size for an interleaved file
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w.WriteBothEndianWord(1) // volume sequence number
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w.WriteByte(byte(len(identifier)))
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w.WriteString(identifier)
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// optional padding to even length
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if recordLength%2 == 1 {
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recordLength++
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w.WriteByte(0)
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}
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return uint32(recordLength)
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}
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func WriteFileRecordHeader(w *SectorWriter, identifier string, firstSectorNum uint32, fileSize uint32) uint32 {
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if len(identifier) > 30 {
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Panicf("directory identifier length %d is out of bounds", len(identifier))
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}
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recordLength := 33 + len(identifier)
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w.WriteByte(byte(recordLength))
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w.WriteByte(0) // number of sectors in extended attribute record
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w.WriteBothEndianDWord(firstSectorNum) // first sector
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w.WriteBothEndianDWord(fileSize)
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writeDirectoryRecordtimestamp(w, time.Now())
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w.WriteByte(byte(0)) // bitfield; normal file
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w.WriteByte(byte(0)) // file unit size for an interleaved file
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w.WriteByte(byte(0)) // interleave gap size for an interleaved file
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w.WriteBothEndianWord(1) // volume sequence number
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w.WriteByte(byte(len(identifier)))
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w.WriteString(identifier)
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// optional padding to even length
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if recordLength%2 == 1 {
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recordLength++
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w.WriteByte(0)
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}
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return uint32(recordLength)
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}
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func writeDirectoryRecordtimestamp(w *SectorWriter, t time.Time) {
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t = t.UTC()
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w.WriteByte(byte(t.Year() - 1900))
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w.WriteByte(byte(t.Month()))
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w.WriteByte(byte(t.Day()))
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w.WriteByte(byte(t.Hour()))
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w.WriteByte(byte(t.Minute()))
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w.WriteByte(byte(t.Second()))
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w.WriteByte(0) // UTC offset
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}
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