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Merge pull request #36 from cy6erGn0m/big-files-md5

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MD5 checksumer shouldn't read the whole file at once
This commit is contained in:
Cedric Beust 2015-11-12 13:34:45 -08:00
commit ccad3e0255
1 changed files with 17 additions and 11 deletions
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28
src/main/kotlin/com/beust/kobalt/maven/Md5.kt
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@ -7,17 +7,23 @@ import java.security.MessageDigest
public class Md5 {
companion object {
fun toMd5(file: File) = toMd5(Files.readAllBytes(Paths.get(file.toURI())))
fun toMd5(file: File) =
MessageDigest.getInstance("MD5").let { md5 ->
file.forEachBlock { bytes, size ->
md5.update(bytes, 0, size)
}
md5.digest().toHex()
}
fun toMd5(bytes: ByteArray): String {
val result = StringBuilder()
val md5 = MessageDigest.getInstance("MD5").digest(bytes)
md5.forEach {
val byte = it.toInt() and 0xff
if (byte < 16) result.append("0")
result.append(Integer.toHexString(byte))
}
return result.toString()
}
fun toMd5(bytes: ByteArray): String =
MessageDigest.getInstance("MD5").digest(bytes).toHex()
}
}
private fun ByteArray.toHex() = buildString {
forEach {
val byte = it.toInt() and 0xff
if (byte < 16) append("0")
append(Integer.toHexString(byte))
}
}