Implement bitstream

1 files changed, 24 insertions, 0 deletions

diff --git a/src/integers.nim b/src/integers.nim
new file mode 100644
index 0000000..1b9121c
--- /dev/null
+++ b/src/integers.nim
@@ -0,0 +1,24 @@
+# "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 <https://www.gnu.org/licenses/>.
+
+const wordBitLength* = 8
+const wordBitMask* = 0b1111_1111'u8
+
+proc `/^`*[T: Natural](x, y: T): T =
+  (x + y - 1) div y
+
+proc truncateToUint8*(x: SomeUnsignedInt): uint8 =
+  (x and wordBitMask).uint8