faster zlib decompression

Author: danielhrisca

pyproject.toml

@@ -36,6 +36,7 @@ keywords = [
 dependencies = [
     "canmatrix[arxml,dbc]>=1.2",
     "isal; platform_machine == 'x86_64' or platform_machine == 'AMD64'",
+    "deflate; platform_machine == 'x86_64' or platform_machine == 'AMD64'",
     "lxml>=4.9.3",
     "lz4",
     "numexpr>=2.10.0",

src/asammdf/blocks/mdf_v4.py

@@ -158,9 +158,15 @@
     CRYPTOGRAPHY_AVAILABLE = False
 
 try:
-    from isal.isal_zlib import decompress
+    from deflate import zlib_decompress
+    def decompress(data, bufsize):
+        return zlib_decompress(data, originalsize=bufsize)
+    
 except ImportError:
-    from zlib import decompress
+    try: 
+        from isal.isal_zlib import decompress
+    except ImportError:
+        from zlib import decompress
 
 if TYPE_CHECKING:
     from ..mdf import MDF

src/asammdf/blocks/v4_blocks.py

@@ -50,18 +50,24 @@
 except:
     pass
 
-try:
-    from isal.isal_zlib import compress, decompress
+COMPRESSION_LEVEL = 2
 
-    COMPRESSION_LEVEL = 2
+try:
+    from deflate import zlib_decompress
+    def decompress(data, bufsize):
+        return zlib_decompress(data, originalsize=bufsize)
 
 except ImportError:
-    from zlib import (  # type: ignore[assignment, no-redef, unused-ignore]
-        compress,
-        decompress,
-    )
+    try:
+        from isal.isal_zlib import compress, decompress
+
+    except ImportError:
+        from zlib import (  # type: ignore[assignment, no-redef, unused-ignore]
+            compress,
+            decompress,
+        )
 
-    COMPRESSION_LEVEL = 1
+        COMPRESSION_LEVEL = 1
 
 try:
     from sympy import lambdify, symbols

src/asammdf/mdf.py

@@ -32,9 +32,14 @@
 from typing_extensions import Any, LiteralString, Never, overload, TypedDict, Unpack
 
 try:
-    from isal.isal_zlib import decompress
+    from deflate import zlib_decompress
+    def decompress(data, bufsize):
+        return zlib_decompress(data, originalsize=bufsize)
 except ImportError:
-    from zlib import decompress
+    try: 
+        from isal.isal_zlib import decompress
+    except ImportError:
+        from zlib import decompress
 import tempfile
 
 from lz4.frame import compress as lz_compress