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|
/* ___ ____ ___ __ ___ ___
** / _// __// _ | / / / _ | / _ \ Scala classfile decoder
** __\ \/ /__/ __ |/ /__/ __ |/ ___/ (c) 2003-2013, LAMP/EPFL
** /____/\___/_/ |_/____/_/ |_/_/ http://scala-lang.org/
**
*/
package scala.tools.scalap
class ByteArrayReader(content: Array[Byte]) {
/** the buffer containing the file
*/
val buf: Array[Byte] = content
/** the current input pointer
*/
var bp: Int = 0
/** return byte at offset 'pos'
*/
def byteAt(pos: Int): Byte = buf(pos)
/** read a byte
*/
def nextByte: Byte = {
bp += 1
buf(bp - 1)
}
/** read some bytes
*/
def nextBytes(len: Int): Array[Byte] = {
val res = new Array[Byte](len)
System.arraycopy(buf, bp, res, 0, len)
bp += len
res
}
/** read a character
*/
def nextChar: Char = {
bp += 2
getChar(bp - 2)
}
/** read an integer
*/
def nextInt: Int = {
bp += 4
getInt(bp - 4)
}
/** read a long
*/
def nextLong: Long = {
bp += 8
getLong(bp - 8)
}
/** read a float
*/
def nextFloat: Float = java.lang.Float.intBitsToFloat(nextInt)
/** read a double
*/
def nextDouble: Double = java.lang.Double.longBitsToDouble(nextLong)
/** read an UTF8 encoded string
*/
def nextUTF8(len: Int): String = {
val cs = scala.io.Codec.fromUTF8(buf, bp, len)
bp += len
new String(cs)
}
/** extract a character at position bp from buf
*/
def getChar(bp: Int): Char =
(((buf(bp) & 0xff) << 8) + (buf(bp + 1) & 0xff)).asInstanceOf[Char]
/** extract an integer at position bp from buf
*/
def getInt(bp: Int): Int =
((buf(bp ) & 0xff) << 24) +
((buf(bp + 1) & 0xff) << 16) +
((buf(bp + 2) & 0xff) << 8) +
(buf(bp + 3) & 0xff)
/** extract a long integer at position bp from buf
*/
def getLong(bp: Int): Long =
(getInt(bp).toLong << 32) + (getInt(bp + 4).toLong & 0xffffffffL)
/** extract a float at position bp from buf
*/
def getFloat(bp: Int): Float = java.lang.Float.intBitsToFloat(getInt(bp))
/** extract a double at position bp from buf
*/
def getDouble(bp: Int): Double = java.lang.Double.longBitsToDouble(getLong(bp))
/** skip next 'n' bytes
*/
def skip(n: Int): Unit = bp += n
}
|
