From 52c08b0282aacb44c2e75cefeae5626a7aa1b21a Mon Sep 17 00:00:00 2001
From: pacien
Date: Fri, 23 Nov 2018 12:31:11 +0100
Subject: Implement bitstream
---
tests/tbitstream.nim | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++
tests/tintegers.nim | 28 +++++++++++
2 files changed, 159 insertions(+)
create mode 100644 tests/tbitstream.nim
create mode 100644 tests/tintegers.nim
(limited to 'tests')
diff --git a/tests/tbitstream.nim b/tests/tbitstream.nim
new file mode 100644
index 0000000..2292049
--- /dev/null
+++ b/tests/tbitstream.nim
@@ -0,0 +1,131 @@
+# "à-la-gzip" 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 .
+
+import unittest, streams, sugar, sequtils
+import integers, bitstream
+
+suite "bitstream":
+ test "chunks iterator":
+ check toSeq(chunks(70, uint32)) == @[(0, 32), (1, 32), (2, 6)]
+ check toSeq(chunks(32, uint16)) == @[(0, 16), (1, 16)]
+
+ test "flush":
+ let stream = newStringStream()
+ defer: stream.close()
+ let bitStream = stream.bitStream()
+
+ bitStream.writeBool(true)
+ stream.setPosition(0)
+ expect IOError: discard stream.peekUint8()
+
+ bitStream.flush()
+ stream.setPosition(0)
+ check stream.readUint8() == 0x01'u8
+ check stream.atEnd()
+
+ bitStream.flush()
+ check stream.atEnd()
+
+ test "readBool":
+ let stream = newStringStream()
+ defer: stream.close()
+ stream.write(0b1001_1111'u8)
+ stream.write(0b0110_0000'u8)
+ stream.setPosition(0)
+
+ let bitStream = stream.bitStream()
+ check lc[bitStream.readBool() | (_ <- 0..<16), bool] == @[
+ true, true, true, true, true, false, false, true,
+ false, false, false, false, false, true, true, false]
+
+ expect IOError: discard bitStream.readBool()
+ check bitStream.atEnd()
+
+ test "readBits":
+ let stream = newStringStream()
+ defer: stream.close()
+ stream.write(0xF00F'u16)
+ stream.write(0x0FFF'u16)
+ stream.setPosition(0)
+
+ let bitStream = stream.bitStream()
+ check bitStream.readBits(8, uint8) == 0x0F'u8
+ check bitStream.readBits(16, uint16) == 0xFFF0'u16
+ check bitStream.readBits(8, uint8) == 0x0F'u8
+
+ expect RangeError: discard bitStream.readBits(9, uint8)
+ expect IOError: discard bitStream.readBits(16, uint16)
+ check bitStream.atEnd()
+
+ test "readSeq":
+ let stream = newStringStream()
+ defer: stream.close()
+ stream.write(0x0F00_F0FF_F0F0_F0F0'u64)
+ stream.setPosition(0)
+
+ let bitStream = stream.bitStream()
+ check bitStream.readSeq(32, uint16) == (32, @[0xF0F0'u16, 0xF0F0])
+ check bitStream.readSeq(40, uint8) == (32, @[0xFF'u8, 0xF0, 0x00, 0x0F])
+ check bitStream.atEnd()
+
+ test "writeBool":
+ let stream = newStringStream()
+ defer: stream.close()
+
+ let bitStream = stream.bitStream()
+ 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: bitStream.writeBool(b)
+ bitStream.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 bitStream = stream.bitStream()
+ bitStream.writeBits(4, 0xF00F'u16)
+ bitStream.writeBits(16, 0xF00F'u16)
+ bitStream.writeBits(16, 0xFFFF'u16)
+ bitStream.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 bitStream = stream.bitStream()
+ bitStream.writeSeq(32, @[0xF0F0'u16, 0xF0F0])
+ bitStream.writeSeq(28, @[0xFF'u8, 0xF0, 0x00, 0xFF])
+ bitStream.flush()
+
+ stream.setPosition(0)
+ check stream.readUint64() == 0x0F00_F0FF_F0F0_F0F0'u64
+ check stream.atEnd()
diff --git a/tests/tintegers.nim b/tests/tintegers.nim
new file mode 100644
index 0000000..720677e
--- /dev/null
+++ b/tests/tintegers.nim
@@ -0,0 +1,28 @@
+# "à-la-gzip" 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 .
+
+import unittest
+import integers
+
+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
--
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