B

Task/Bitwise-IO/Python/bitwise-io-1.py

@@ -0,0 +1,51 @@
+class BitWriter:
+    def __init__(self, f):
+        self.accumulator = 0
+        self.bcount = 0
+        self.out = f
+
+    def __del__(self):
+        self.flush()
+
+    def writebit(self, bit):
+        if self.bcount == 8 :
+            self.flush()
+        if bit > 0:
+            self.accumulator |= (1 << (7-self.bcount))
+        self.bcount += 1
+
+    def writebits(self, bits, n):
+        while n > 0:
+            self.writebit( bits & (1 << (n-1)) )
+            n -= 1
+
+    def flush(self):
+        self.out.write(chr(self.accumulator))
+        self.accumulator = 0
+        self.bcount = 0
+
+
+class BitReader:
+    def __init__(self, f):
+        self.input = f
+        self.accumulator = 0
+        self.bcount = 0
+        self.read = 0
+
+    def readbit(self):
+        if self.bcount == 0 :
+            a = self.input.read(1)
+            if ( len(a) > 0 ):
+                self.accumulator = ord(a)
+            self.bcount = 8
+            self.read = len(a)
+        rv = ( self.accumulator & ( 1 << (self.bcount-1) ) ) >> (self.bcount-1)
+        self.bcount -= 1
+        return rv
+
+    def readbits(self, n):
+        v = 0
+        while n > 0:
+            v = (v << 1) | self.readbit()
+            n -= 1
+        return v

Task/Bitwise-IO/Python/bitwise-io-2.py

@@ -0,0 +1,9 @@
+#! /usr/bin/env python
+import sys
+import bitio
+
+o = bitio.BitWriter(sys.stdout)
+c = sys.stdin.read(1)
+while len(c) > 0:
+    o.writebits(ord(c), 7)
+    c = sys.stdin.read(1)

Task/Bitwise-IO/Python/bitwise-io-3.py

@@ -0,0 +1,10 @@
+#! /usr/bin/env python
+import sys
+import bitio
+
+r = bitio.BitReader(sys.stdin)
+while True:
+    x = r.readbits(7)
+    if ( r.read == 0 ):
+        break
+    sys.stdout.write(chr(x))