Changeset 732

Timestamp:

06/04/06 12:27:05 (2 years ago)

Author:

mfenniak

Message:

begin adding .NET compression library support as a replacement for zlib when not available

Files:

• pypdf/trunk/pyPdf/filters.py (modified) (2 diffs)

pypdf/trunk/pyPdf/filters.py

@@ -35 +35 @@
-__author_email__ = "mfenniak@pobox.com"
-
-import zlib
-from generic import NameObject
+
+try:
+    import zlib
+    def decompress(data):
+        return zlib.decompress(data)
+    def compress(data):
+        return zlib.compress(data)
+except ImportError:
+    # Unable to import zlib.  If running in IronPython, try using
+    # System.IO.Compression instead.
+    from System import IO, Text
+    _encoding = Text.ASCIIEncoding()
+    def _string_to_bytearr(string):
+        return _encoding.GetBytes(string)
+    def _bytearr_to_string(bytes):
+        return _encoding.GetString(bytes)
+    def _read_bytes(gz, byteArray):
+        pass
+    def decompress(data):
+        bytes = _string_to_bytearr(data)
+        ms = IO.MemoryStream()
+        ms.Write(bytes, 0, bytes.Length)
+        ms.Position = 0  # fseek 0
+        gz = IO.Compression.GZipStream(ms, IO.Compression.CompressionMode.Decompress)
+        bytes = _read_bytes(gz)
+        retval = _bytearr_to_string(bytes)
+        gz.Close()
+        return retval
+    # implementation not complete or tested, but checked in just for fun.
+    
+
-
-class FlateDecode(object):
-    def decode(data, decodeParms):
-zlib.
+
-        predictor = 1
-        if decodeParms:
@@ -77 +107 @@
-
-    def encode(data):
-zlib.
+
-    encode = staticmethod(encode)
-