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archive: simplify DetectCompression

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Docker-DCO-1.1-Signed-off-by: Johan Euphrosine <proppy@google.com> (github: proppy)
This commit is contained in:
Johan Euphrosine 2014-05-16 12:15:21 -07:00
parent 58b49e60bb
commit 3118952e0a
1 changed files with 1 additions and 15 deletions
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16
archive/archive.go
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@ -42,26 +42,12 @@ const (
) )
func DetectCompression(source []byte) Compression { func DetectCompression(source []byte) Compression {
sourceLen := len(source)
for compression, m := range map[Compression][]byte{ for compression, m := range map[Compression][]byte{
Bzip2: {0x42, 0x5A, 0x68}, Bzip2: {0x42, 0x5A, 0x68},
Gzip: {0x1F, 0x8B, 0x08}, Gzip: {0x1F, 0x8B, 0x08},
Xz: {0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00}, Xz: {0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00},
} { } {
fail := false if bytes.Compare(m, source[:len(m)]) == 0 {
if len(m) > sourceLen {
utils.Debugf("Len too short")
continue
}
i := 0
for _, b := range m {
if b != source[i] {
fail = true
break
}
i++
}
if !fail {
return compression return compression
} }
} }