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35 lines
651 B
Go
35 lines
651 B
Go
6 years ago
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package build
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import (
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"archive/tar"
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"bytes"
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"os"
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)
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// archiveHeaderSize is the number of bytes in an archive header
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const archiveHeaderSize = 512
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func isLocalDir(c string) bool {
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st, err := os.Stat(c)
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return err == nil && st.IsDir()
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}
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func isArchive(header []byte) bool {
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for _, m := range [][]byte{
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{0x42, 0x5A, 0x68}, // bzip2
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{0x1F, 0x8B, 0x08}, // gzip
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{0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00}, // xz
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} {
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if len(header) < len(m) {
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continue
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}
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if bytes.Equal(m, header[:len(m)]) {
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return true
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}
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}
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r := tar.NewReader(bytes.NewBuffer(header))
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_, err := r.Next()
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return err == nil
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}
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