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diff --git a/Lib/ArrayIO.py b/Lib/ArrayIO.py
new file mode 100755 (executable)
index 0000000..4a163ac
--- /dev/null
+++ b/Lib/ArrayIO.py
@@ -0,0 +1,122 @@
+# port of StringIO.py using arrays
+# ArrayIO.py
+# jjk  02/28/96  001  direct mod of StringIO, test suite checks out
+# jjk  02/28/96  002  inherit from StringIO, test suite checks out
+# jjk  02/28/96  003  add __xx__() functions
+#
+# class ArrayIO implements  file-like objects that read/write a
+# string buffer (a.k.a. "memory files"). 
+#
+# all methods that interface with ArrayIO pass strings. Internally, however,
+# ArrayIO uses an array object.
+#
+# the interface is the same as StringIO.py
+# also handles len(a), a[i], a[i]='x', a[i:j], a[i:j] = aString
+#
+
+import string
+import array
+import StringIO
+
+class ArrayIO(StringIO.StringIO):
+# jjk  02/28/96
+       def __init__(self, buf = ''):
+       #jjk  02/28/96
+               self.buf = array.array('c', buf)
+               self.pos = 0
+               self.closed = 0
+       def __len__(self): 
+       #jjk  02/28/96
+               return len(self.buf)
+       def __getitem__(self, key): 
+       #jjk  02/28/96
+               return self.buf[key]
+       def __setitem__(self, key, item): 
+       #jjk  02/28/96
+               self.buf[key] = item
+       def __getslice__(self, i, j): 
+       #jjk  02/28/96
+               return self.buf[i:j].tostring()
+       def __setslice__(self, i, j, aString): 
+       #jjk  02/28/96
+               self.buf[i:j] = array.array('c', aString)
+       def read(self, n = 0):
+       #jjk  02/28/96
+               r = StringIO.StringIO.read(self, n)
+               return (r.tostring())
+       def _findCharacter(self, char, start):
+        #probably very slow
+       #jjk  02/28/96
+               for i in range(max(start, 0), len(self.buf)):
+                       if (self.buf[i] == char):
+                               return(i)
+               return(-1)
+       def readline(self):
+       #jjk  02/28/96
+               i = self._findCharacter('\n', self.pos)
+               if i < 0:
+                       newpos = len(self.buf)
+               else:
+                       newpos = i+1
+               r = self.buf[self.pos:newpos].tostring()
+               self.pos = newpos
+               return r
+       def write(self, s):
+       #jjk  02/28/96
+               if not s: return
+               if self.pos > len(self.buf):
+                       self.buf.fromstring('\0'*(self.pos - len(self.buf)))
+               newpos = self.pos + len(s)
+               self.buf[self.pos:newpos] = array.array('c', s)
+               self.pos = newpos
+       def getvalue(self):
+       #jjk  02/28/96
+               return self.buf.tostring()
+
+
+# A little test suite
+# identical to test suite in StringIO.py , except for "f = ArrayIO()"
+# too bad I couldn't inherit this :-)
+
+def test():
+       import sys
+       if sys.argv[1:]:
+               file = sys.argv[1]
+       else:
+               file = '/etc/passwd'
+       lines = open(file, 'r').readlines()
+       text = open(file, 'r').read()
+       f = ArrayIO()
+       for line in lines[:-2]:
+               f.write(line)
+       f.writelines(lines[-2:])
+       if f.getvalue() != text:
+               raise RuntimeError, 'write failed'
+       length = f.tell()
+       print 'File length =', length
+       f.seek(len(lines[0]))
+       f.write(lines[1])
+       f.seek(0)
+       print 'First line =', `f.readline()`
+       here = f.tell()
+       line = f.readline()
+       print 'Second line =', `line`
+       f.seek(-len(line), 1)
+       line2 = f.read(len(line))
+       if line != line2:
+               raise RuntimeError, 'bad result after seek back'
+       f.seek(len(line2), 1)
+       list = f.readlines()
+       line = list[-1]
+       f.seek(f.tell() - len(line))
+       line2 = f.read()
+       if line != line2:
+               raise RuntimeError, 'bad result after seek back from EOF'
+       print 'Read', len(list), 'more lines'
+       print 'File length =', f.tell()
+       if f.tell() != length:
+               raise RuntimeError, 'bad length'
+       f.close()
+
+if __name__ == '__main__':
+       test()