ref: 3ee6d240b0cbb515f01ab0c00b735a66c2eee043
app/src/main/java/xyz/apiote/fruchtfleisch/Reader.kt
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package xyz.apiote.fruchtfleisch import java.io.EOFException import java.io.InputStream import java.lang.Double.longBitsToDouble import java.lang.Float.intBitsToFloat class Reader(private val stream: InputStream) { fun readUInt(): ULong { var result: ULong = 0UL var i = 0 var s = 0 while (true) { val b = stream.read() if (b < 0) { throw EOFException("while reading byte") } if (b < 0x80) { if (i > 9 || (i == 9 && b > 1)) { TODO("throw int overflow") } result = result.or(b.toULong().shl(s)) break } i++ s += 7 } return result } fun readInt(): Long { val unsigned = readUInt() var signed = unsigned.shr(1).toLong() if (unsigned.and(1UL) != 0UL) { signed = signed.inv() } return signed } fun readU8(): UByte { val b = stream.read() if (b < 0) { throw EOFException("while reading byte") } return b.toUByte() } fun readU16(): UShort { val b1 = readU8() val b2 = readU8() return (b2.toUInt().shl(8) or b1.toUInt()).toUShort() } fun readU32(): UInt { val b1 = readU8() val b2 = readU8() val b3 = readU8() val b4 = readU8() return b4.toUInt().shl(24) or b3.toUInt().shl(16) or b2.toUInt().shl(8) or b1.toUInt() } fun readU64(): ULong { val b1 = readU8() val b2 = readU8() val b3 = readU8() val b4 = readU8() val b5 = readU8() val b6 = readU8() val b7 = readU8() val b8 = readU8() return b8.toULong().shl(56) or b7.toULong().shl(48) or b6.toULong().shl(40) or b5.toULong().shl(32) or b4.toULong().shl(24) or b3.toULong().shl(16) or b2.toULong().shl(8) or b1.toULong() } fun readI8(): Byte { return readU8().toByte() } fun readI16(): Short { return readU16().toShort() } fun readI32(): Int { return readU32().toInt() } fun readI64(): Long { return readU64().toLong() } fun readFloat32(): Float { return intBitsToFloat(readI32()) } fun readFloat64(): Double { return longBitsToDouble(readI64()) } fun readData(length: UByte): ByteArray { val n = length.toInt() val data = ByteArray(n) var left = n while (left > 0) { val r = stream.read(data, n - left, left) left -= r } return data } fun readString(): String { val length = readU8() return readData(length).decodeToString() } fun readBoolean(): Boolean { return when (readU8().toUInt()) { 0u -> false 1u -> true else -> TODO("throw wrong value") } } } |