71 lines
1.1 KiB
Go
71 lines
1.1 KiB
Go
package fs
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import (
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"crypto/sha1"
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"encoding/hex"
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"hash/crc32"
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"io"
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"os"
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)
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// Hash returns the SHA1 hash of a file as string.
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func Hash(fileName string) string {
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var result []byte
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file, err := os.Open(fileName)
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if err != nil {
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return ""
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}
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defer file.Close()
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hash := sha1.New()
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if _, err := io.Copy(hash, file); err != nil {
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return ""
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}
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return hex.EncodeToString(hash.Sum(result))
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}
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// Checksum returns the CRC32 checksum of a file as string.
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func Checksum(fileName string) string {
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var result []byte
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file, err := os.Open(fileName)
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if err != nil {
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return ""
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}
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defer file.Close()
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hash := crc32.New(crc32.MakeTable(crc32.Castagnoli))
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if _, err := io.Copy(hash, file); err != nil {
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return ""
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}
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return hex.EncodeToString(hash.Sum(result))
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}
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// IsHash tests if a string looks like a hash.
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func IsHash(s string) bool {
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if s == "" {
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return false
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}
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for _, r := range s {
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if (r < 48 || r > 57) && (r < 97 || r > 102) && (r < 65 || r > 70) {
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return false
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}
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}
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switch len(s) {
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case 8, 16, 32, 40, 56, 64, 80, 128, 256:
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return true
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}
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return false
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}
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