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60 lines
1.1 KiB
60 lines
1.1 KiB
10 months ago
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package gziputil
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import (
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"encoding/binary"
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"fmt"
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)
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type Gzip struct {
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magic []byte
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cm byte
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flg byte
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mtime uint32
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xfl byte
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os byte
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xlen uint16
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xflds []byte
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crc32 uint32
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isize uint32
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rest []byte
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trailer []byte
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}
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func explainGzip(bs []byte) Gzip {
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g := Gzip{
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magic: bs[0:2],
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cm: bs[2],
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flg: bs[3],
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mtime: binary.BigEndian.Uint32(bs[4:8]),
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xfl: bs[8],
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os: bs[9],
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}
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offset := 10
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if g.xfl&2 == 1 {
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g.xlen = binary.BigEndian.Uint16(bs[offset : offset+2])
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offset += 2
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g.xflds = bs[offset : offset+int(g.xlen)]
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offset += int(g.xlen)
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}
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g.crc32 = binary.BigEndian.Uint32(bs[offset : offset+4])
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offset += 4
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g.isize = binary.BigEndian.Uint32(bs[offset : offset+4])
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offset += 4
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g.rest = bs[offset : len(bs)-8]
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offset = len(bs) - 8
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g.trailer = bs[offset:]
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return g
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}
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func (g Gzip) String() string {
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return fmt.Sprintf("magic=%04x cm=%02x flg=%02x mtime=%d xfl=%02x os=%02x xlen=%d crc32=%d isize=%d rest=%x trailer=%08x", g.magic, g.cm, g.flg, g.mtime, g.xfl, g.os, g.xlen, g.crc32, g.isize, g.rest, g.trailer)
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}
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