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# gzip-like LZSS compressor
# Copyright (C) 2018 Pacien TRAN-GIRARD
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import unittest, streams, sugar, sequtils
import bitio/integers, bitio/bitreader, bitio/bitwriter
suite "integers":
test "Round-up integer division":
check 42 /^ 2 == 21
check 43 /^ 2 == 22
test "truncateToUint8":
check truncateToUint8(0xFA'u8) == 0xFA'u8
check truncateToUint8(0x00FA'u16) == 0xFA'u8
check truncateToUint8(0xFFFA'u16) == 0xFA'u8
test "bitLength":
check bitLength(0b1_1111) == 5
check bitLength(0b1000_0000) == 8
test "leastSignificantBits":
check leastSignificantBits(0xFF'u8, 3) == 0b0000_0111'u8
check leastSignificantBits(0b0001_0101'u8, 3) == 0b0000_0101'u8
check leastSignificantBits(0xFF'u8, 10) == 0xFF'u8
check leastSignificantBits(0xFFFF'u16, 16) == 0xFFFF'u16
check leastSignificantBits(0xFFFF'u16, 8) == 0x00FF'u16
test "chunks iterator":
check toSeq(chunks(70, uint32)) == @[(0, 32), (1, 32), (2, 6)]
check toSeq(chunks(32, uint16)) == @[(0, 16), (1, 16)]
suite "bitreader":
test "readBool":
let stream = newStringStream()
defer: stream.close()
stream.write(0b1001_1111'u8)
stream.write(0b0110_0000'u8)
stream.setPosition(0)
let bitReader = stream.bitReader()
check lc[bitReader.readBool() | (_ <- 0..<16), bool] == @[
true, true, true, true, true, false, false, true,
false, false, false, false, false, true, true, false]
expect IOError: discard bitReader.readBool()
check bitReader.atEnd()
test "readBits":
let stream = newStringStream()
defer: stream.close()
stream.write(0xF00F'u16)
stream.write(0x0FFF'u16)
stream.setPosition(0)
let bitReader = stream.bitReader()
check bitReader.readBits(8, uint8) == 0x0F'u8
check bitReader.readBits(16, uint16) == 0xFFF0'u16
check bitReader.readBits(8, uint8) == 0x0F'u8
expect RangeError: discard bitReader.readBits(9, uint8)
expect IOError: discard bitReader.readBits(16, uint16)
check bitReader.atEnd()
test "readBits (look-ahead overflow)":
let stream = newStringStream()
defer: stream.close()
stream.write(0xAB'u8)
stream.setPosition(0)
let bitReader = stream.bitReader()
check bitReader.readBits(4, uint16) == 0x000B'u16
check bitReader.readBits(4, uint16) == 0x000A'u16
check bitReader.atEnd()
test "readBits (from buffer composition)":
let stream = newStringStream()
defer: stream.close()
stream.write(0xABCD'u16)
stream.setPosition(0)
let bitReader = stream.bitReader()
check bitReader.readBits(4, uint16) == 0x000D'u16
check bitReader.readBits(8, uint16) == 0x00BC'u16
check bitReader.readBits(4, uint16) == 0x000A'u16
check bitReader.atEnd()
test "readSeq":
let stream = newStringStream()
defer: stream.close()
stream.write(0x0F00_F0FF_F0F0_F0F0'u64)
stream.setPosition(0)
let bitReader = stream.bitReader()
check bitReader.readSeq(32, uint16) == (32, @[0xF0F0'u16, 0xF0F0])
check bitReader.readSeq(40, uint8) == (32, @[0xFF'u8, 0xF0, 0x00, 0x0F])
check bitReader.atEnd()
suite "bitwriter":
test "flush":
let stream = newStringStream()
defer: stream.close()
let bitWriter = stream.bitWriter()
bitWriter.writeBool(true)
stream.setPosition(0)
expect IOError: discard stream.peekUint8()
bitWriter.flush()
stream.setPosition(0)
check stream.readUint8() == 0x01'u8
check stream.atEnd()
bitWriter.flush()
check stream.atEnd()
test "writeBool":
let stream = newStringStream()
defer: stream.close()
let bitWriter = stream.bitWriter()
let booleanValues = @[
true, true, true, true, true, false, false, true,
false, false, false, false, false, true, true, false,
true, true, false, true]
for b in booleanValues: bitWriter.writeBool(b)
bitWriter.flush()
stream.setPosition(0)
check stream.readUint8() == 0b1001_1111'u8
check stream.readUint8() == 0b0110_0000'u8
check stream.readUint8() == 0b0000_1011'u8
expect IOError: discard stream.readUint8()
check stream.atEnd()
test "writeBits":
let stream = newStringStream()
defer: stream.close()
let bitWriter = stream.bitWriter()
bitWriter.writeBits(4, 0xF00F'u16)
bitWriter.writeBits(16, 0xF00F'u16)
bitWriter.writeBits(16, 0xFFFF'u16)
bitWriter.flush()
stream.setPosition(0)
check stream.readUint16() == 0x00FF'u16
check stream.readUint16() == 0xFFFF'u16
check stream.readUint8() == 0x0F'u8
expect IOError: discard stream.readUint8()
check stream.atEnd()
test "writeSeq":
let stream = newStringStream()
defer: stream.close()
let bitWriter = stream.bitWriter()
bitWriter.writeSeq(32, @[0xF0F0'u16, 0xF0F0])
bitWriter.writeSeq(28, @[0xFF'u8, 0xF0, 0x00, 0xFF])
bitWriter.flush()
stream.setPosition(0)
check stream.readUint64() == 0x0F00_F0FF_F0F0_F0F0'u64
check stream.atEnd()
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