mirror of https://github.com/sbt/sbt.git
76 lines
2.0 KiB
Scala
76 lines
2.0 KiB
Scala
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/* sbt -- Simple Build Tool
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* Copyright 2009 Mark Harrah
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*/
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package xsbt
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import java.io.{ByteArrayInputStream, File, InputStream}
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object Hash
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{
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private val BufferSize = 8192
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def toHex(bytes: Array[Byte]): String =
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{
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val buffer = new StringBuilder(bytes.length * 2)
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for(i <- 0 until bytes.length)
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{
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val b = bytes(i)
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val bi: Int = if(b < 0) b + 256 else b
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buffer append toHex((bi >>> 4).asInstanceOf[Byte])
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buffer append toHex((bi & 0x0F).asInstanceOf[Byte])
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}
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buffer.toString
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}
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def fromHex(hex: String): Array[Byte] =
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{
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require((hex.length & 1) == 0, "Hex string must have length 2n.")
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val array = new Array[Byte](hex.length >> 1)
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for(i <- 0 until hex.length by 2)
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{
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val c1 = hex.charAt(i)
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val c2 = hex.charAt(i+1)
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array(i >> 1) = ((fromHex(c1) << 4) | fromHex(c2)).asInstanceOf[Byte]
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}
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array
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}
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/** Calculates the SHA-1 hash of the given String.*/
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def apply(s: String): Array[Byte] = apply(new ByteArrayInputStream(s.getBytes("UTF-8")))
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/** Calculates the SHA-1 hash of the given file.*/
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def apply(file: File): Array[Byte] = OpenResource.fileInputStream(file)(apply)
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/** Calculates the SHA-1 hash of the given stream, closing it when finished.*/
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def apply(stream: InputStream): Array[Byte] =
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{
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import java.security.{MessageDigest, DigestInputStream}
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val digest = MessageDigest.getInstance("SHA")
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try
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{
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val dis = new DigestInputStream(stream, digest)
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val buffer = new Array[Byte](BufferSize)
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while(dis.read(buffer) >= 0) {}
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dis.close()
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digest.digest
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}
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finally { stream.close() }
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}
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private def toHex(b: Byte): Char =
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{
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require(b >= 0 && b <= 15, "Byte " + b + " was not between 0 and 15")
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if(b < 10)
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('0'.asInstanceOf[Int] + b).asInstanceOf[Char]
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else
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('a'.asInstanceOf[Int] + (b-10)).asInstanceOf[Char]
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}
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private def fromHex(c: Char): Int =
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{
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val b =
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if(c >= '0' && c <= '9')
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(c - '0')
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else if(c >= 'a' && c <= 'f')
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(c - 'a') + 10
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else if(c >= 'A' && c <= 'F')
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(c - 'A') + 10
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else
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throw new RuntimeException("Invalid hex character: '" + c + "'.")
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b
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}
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}
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